source: trunk/binutils/gas/config/tc-xtensa.c@ 3286

Last change on this file since 3286 was 607, checked in by bird, 22 years ago

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1/* tc-xtensa.c -- Assemble Xtensa instructions.
2 Copyright 2003 Free Software Foundation, Inc.
3
4 This file is part of GAS, the GNU Assembler.
5
6 GAS is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
9 any later version.
10
11 GAS is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with GAS; see the file COPYING. If not, write to
18 the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
19 MA 02111-1307, USA. */
20
21#include <string.h>
22#include "as.h"
23#include "sb.h"
24#include "safe-ctype.h"
25#include "tc-xtensa.h"
26#include "frags.h"
27#include "subsegs.h"
28#include "xtensa-relax.h"
29#include "xtensa-istack.h"
30#include "dwarf2dbg.h"
31#include "struc-symbol.h"
32#include "xtensa-config.h"
33
34#ifndef uint32
35#define uint32 unsigned int
36#endif
37#ifndef int32
38#define int32 signed int
39#endif
40
41/* Notes:
42
43 There are 3 forms for instructions,
44 1) the MEMORY format -- this is the encoding 2 or 3 byte instruction
45 2) the TInsn -- handles instructions/labels and literals;
46 all operands are assumed to be expressions
47 3) the IStack -- a stack of TInsn. this allows us to
48 reason about the generated expansion instructions
49
50 Naming conventions (used somewhat inconsistently):
51 The xtensa_ functions are exported
52 The xg_ functions are internal
53
54 We also have a couple of different extensibility mechanisms.
55 1) The idiom replacement:
56 This is used when a line is first parsed to
57 replace an instruction pattern with another instruction
58 It is currently limited to replacements of instructions
59 with constant operands.
60 2) The xtensa-relax.c mechanism that has stronger instruction
61 replacement patterns. When an instruction's immediate field
62 does not fit the next instruction sequence is attempted.
63 In addition, "narrow" opcodes are supported this way. */
64
65
66/* Define characters with special meanings to GAS. */
67const char comment_chars[] = "#";
68const char line_comment_chars[] = "#";
69const char line_separator_chars[] = ";";
70const char EXP_CHARS[] = "eE";
71const char FLT_CHARS[] = "rRsSfFdDxXpP";
72
73
74/* Flag to indicate whether the hardware supports the density option.
75 If not, enabling density instructions (via directives or --density flag)
76 is illegal. */
77
78#if STATIC_LIBISA
79bfd_boolean density_supported = XCHAL_HAVE_DENSITY;
80#else
81bfd_boolean density_supported = TRUE;
82#endif
83
84#define XTENSA_FETCH_WIDTH 4
85
86/* Flags for properties of the last instruction in a segment. */
87#define FLAG_IS_A0_WRITER 0x1
88#define FLAG_IS_BAD_LOOPEND 0x2
89
90
91/* We define a special segment names ".literal" to place literals
92 into. The .fini and .init sections are special because they
93 contain code that is moved together by the linker. We give them
94 their own special .fini.literal and .init.literal sections. */
95
96#define LITERAL_SECTION_NAME xtensa_section_rename (".literal")
97#define FINI_SECTION_NAME xtensa_section_rename (".fini")
98#define INIT_SECTION_NAME xtensa_section_rename (".init")
99#define FINI_LITERAL_SECTION_NAME xtensa_section_rename (".fini.literal")
100#define INIT_LITERAL_SECTION_NAME xtensa_section_rename (".init.literal")
101
102
103/* This type is used for the directive_stack to keep track of the
104 state of the literal collection pools. */
105
106typedef struct lit_state_struct
107{
108 const char *lit_seg_name;
109 const char *init_lit_seg_name;
110 const char *fini_lit_seg_name;
111 segT lit_seg;
112 segT init_lit_seg;
113 segT fini_lit_seg;
114} lit_state;
115
116static lit_state default_lit_sections;
117
118
119/* We keep lists of literal segments. The seg_list type is the node
120 for such a list. The *_literal_head locals are the heads of the
121 various lists. All of these lists have a dummy node at the start. */
122
123typedef struct seg_list_struct
124{
125 struct seg_list_struct *next;
126 segT seg;
127} seg_list;
128
129static seg_list literal_head_h;
130static seg_list *literal_head = &literal_head_h;
131static seg_list init_literal_head_h;
132static seg_list *init_literal_head = &init_literal_head_h;
133static seg_list fini_literal_head_h;
134static seg_list *fini_literal_head = &fini_literal_head_h;
135
136
137/* Global flag to indicate when we are emitting literals. */
138int generating_literals = 0;
139
140
141/* Structure for saving the current state before emitting literals. */
142typedef struct emit_state_struct
143{
144 const char *name;
145 segT now_seg;
146 subsegT now_subseg;
147 int generating_literals;
148} emit_state;
149
150
151/* Directives. */
152
153typedef enum
154{
155 directive_none = 0,
156 directive_literal,
157 directive_density,
158 directive_generics,
159 directive_relax,
160 directive_freeregs,
161 directive_longcalls,
162 directive_literal_prefix
163} directiveE;
164
165typedef struct
166{
167 const char *name;
168 bfd_boolean can_be_negated;
169} directive_infoS;
170
171const directive_infoS directive_info[] =
172{
173 {"none", FALSE},
174 {"literal", FALSE},
175 {"density", TRUE},
176 {"generics", TRUE},
177 {"relax", TRUE},
178 {"freeregs", FALSE},
179 {"longcalls", TRUE},
180 {"literal_prefix", FALSE}
181};
182
183bfd_boolean directive_state[] =
184{
185 FALSE, /* none */
186 FALSE, /* literal */
187#if STATIC_LIBISA && !XCHAL_HAVE_DENSITY
188 FALSE, /* density */
189#else
190 TRUE, /* density */
191#endif
192 TRUE, /* generics */
193 TRUE, /* relax */
194 FALSE, /* freeregs */
195 FALSE, /* longcalls */
196 FALSE /* literal_prefix */
197};
198
199
200enum xtensa_relax_statesE
201{
202 RELAX_ALIGN_NEXT_OPCODE,
203 /* Use the first opcode of the next fragment to determine the
204 alignment requirements. This is ONLY used for LOOPS
205 currently. */
206
207 RELAX_DESIRE_ALIGN_IF_TARGET,
208 /* These are placed in front of labels. They will all be converted
209 to RELAX_DESIRE_ALIGN / RELAX_LOOP_END or rs_fill of 0 before
210 relaxation begins. */
211
212 RELAX_ADD_NOP_IF_A0_B_RETW,
213 /* These are placed in front of conditional branches. It will be
214 turned into a NOP (using a1) if the branch is immediately
215 followed by a RETW or RETW.N. Otherwise it will be turned into
216 an rs_fill of 0 before relaxation begins. */
217
218 RELAX_ADD_NOP_IF_PRE_LOOP_END,
219 /* These are placed after JX instructions. It will be turned into a
220 NOP if there is one instruction before a loop end label.
221 Otherwise it will be turned into an rs_fill of 0 before
222 relaxation begins. This is used to avoid a hardware TIE
223 interlock issue prior to T1040. */
224
225 RELAX_ADD_NOP_IF_SHORT_LOOP,
226 /* These are placed after LOOP instructions. It will be turned into
227 a NOP when: (1) there are less than 3 instructions in the loop;
228 we place 2 of these in a row to add up to 2 NOPS in short loops;
229 or (2) The instructions in the loop do not include a branch or
230 jump. Otherwise it will be turned into an rs_fill of 0 before
231 relaxation begins. This is used to avoid hardware bug
232 PR3830. */
233
234 RELAX_ADD_NOP_IF_CLOSE_LOOP_END,
235 /* These are placed after LOOP instructions. It will be turned into
236 a NOP if there are less than 12 bytes to the end of some other
237 loop's end. Otherwise it will be turned into an rs_fill of 0
238 before relaxation begins. This is used to avoid hardware bug
239 PR3830. */
240
241 RELAX_DESIRE_ALIGN,
242 /* The next fragment like its first instruction to NOT cross a
243 4-byte boundary. */
244
245 RELAX_LOOP_END,
246 /* This will be turned into a NOP or NOP.N if the previous
247 instruction is expanded to negate a loop. */
248
249 RELAX_LOOP_END_ADD_NOP,
250 /* When the code density option is available, this will generate a
251 NOP.N marked RELAX_NARROW. Otherwise, it will create an rs_fill
252 fragment with a NOP in it. */
253
254 RELAX_LITERAL,
255 /* Another fragment could generate an expansion here but has not yet. */
256
257 RELAX_LITERAL_NR,
258 /* Expansion has been generated by an instruction that generates a
259 literal. However, the stretch has NOT been reported yet in this
260 fragment. */
261
262 RELAX_LITERAL_FINAL,
263 /* Expansion has been generated by an instruction that generates a
264 literal. */
265
266 RELAX_LITERAL_POOL_BEGIN,
267 RELAX_LITERAL_POOL_END,
268 /* Technically these are not relaxations at all, but mark a location
269 to store literals later. Note that fr_var stores the frchain for
270 BEGIN frags and fr_var stores now_seg for END frags. */
271
272 RELAX_NARROW,
273 /* The last instruction in this fragment (at->fr_opcode) can be
274 freely replaced with a single wider instruction if a future
275 alignment desires or needs it. */
276
277 RELAX_IMMED,
278 /* The last instruction in this fragment (at->fr_opcode) contains
279 the value defined by fr_symbol (fr_offset = 0). If the value
280 does not fit, use the specified expansion. This is similar to
281 "NARROW", except that these may not be expanded in order to align
282 code. */
283
284 RELAX_IMMED_STEP1,
285 /* The last instruction in this fragment (at->fr_opcode) contains a
286 literal. It has already been expanded at least 1 step. */
287
288 RELAX_IMMED_STEP2
289 /* The last instruction in this fragment (at->fr_opcode) contains a
290 literal. It has already been expanded at least 2 steps. */
291};
292
293/* This is used as a stopper to bound the number of steps that
294 can be taken. */
295#define RELAX_IMMED_MAXSTEPS (RELAX_IMMED_STEP2 - RELAX_IMMED)
296
297
298typedef bfd_boolean (*frag_predicate) (const fragS *);
299
300
301/* Directive functions. */
302
303static bfd_boolean use_generics
304 PARAMS ((void));
305static bfd_boolean use_longcalls
306 PARAMS ((void));
307static bfd_boolean code_density_available
308 PARAMS ((void));
309static bfd_boolean can_relax
310 PARAMS ((void));
311static void directive_push
312 PARAMS ((directiveE, bfd_boolean, const void *));
313static void directive_pop
314 PARAMS ((directiveE *, bfd_boolean *, const char **,
315 unsigned int *, const void **));
316static void directive_balance
317 PARAMS ((void));
318static bfd_boolean inside_directive
319 PARAMS ((directiveE));
320static void get_directive
321 PARAMS ((directiveE *, bfd_boolean *));
322static void xtensa_begin_directive
323 PARAMS ((int));
324static void xtensa_end_directive
325 PARAMS ((int));
326static void xtensa_literal_prefix
327 PARAMS ((char const *, int));
328static void xtensa_literal_position
329 PARAMS ((int));
330static void xtensa_literal_pseudo
331 PARAMS ((int));
332
333/* Parsing and Idiom Translation Functions. */
334
335static const char *expression_end
336 PARAMS ((const char *));
337static unsigned tc_get_register
338 PARAMS ((const char *));
339static void expression_maybe_register
340 PARAMS ((xtensa_operand, expressionS *));
341static int tokenize_arguments
342 PARAMS ((char **, char *));
343static bfd_boolean parse_arguments
344 PARAMS ((TInsn *, int, char **));
345static int xg_translate_idioms
346 PARAMS ((char **, int *, char **));
347static int xg_translate_sysreg_op
348 PARAMS ((char **, int *, char **));
349static void xg_reverse_shift_count
350 PARAMS ((char **));
351static int xg_arg_is_constant
352 PARAMS ((char *, offsetT *));
353static void xg_replace_opname
354 PARAMS ((char **, char *));
355static int xg_check_num_args
356 PARAMS ((int *, int, char *, char **));
357
358/* Functions for dealing with the Xtensa ISA. */
359
360static bfd_boolean operand_is_immed
361 PARAMS ((xtensa_operand));
362static bfd_boolean operand_is_pcrel_label
363 PARAMS ((xtensa_operand));
364static int get_relaxable_immed
365 PARAMS ((xtensa_opcode));
366static xtensa_opcode get_opcode_from_buf
367 PARAMS ((const char *));
368static bfd_boolean is_direct_call_opcode
369 PARAMS ((xtensa_opcode));
370static bfd_boolean is_call_opcode
371 PARAMS ((xtensa_opcode));
372static bfd_boolean is_entry_opcode
373 PARAMS ((xtensa_opcode));
374static bfd_boolean is_loop_opcode
375 PARAMS ((xtensa_opcode));
376static bfd_boolean is_the_loop_opcode
377 PARAMS ((xtensa_opcode));
378static bfd_boolean is_jx_opcode
379 PARAMS ((xtensa_opcode));
380static bfd_boolean is_windowed_return_opcode
381 PARAMS ((xtensa_opcode));
382static bfd_boolean is_conditional_branch_opcode
383 PARAMS ((xtensa_opcode));
384static bfd_boolean is_branch_or_jump_opcode
385 PARAMS ((xtensa_opcode));
386static bfd_reloc_code_real_type opnum_to_reloc
387 PARAMS ((int));
388static int reloc_to_opnum
389 PARAMS ((bfd_reloc_code_real_type));
390static void xtensa_insnbuf_set_operand
391 PARAMS ((xtensa_insnbuf, xtensa_opcode, xtensa_operand, int32,
392 const char *, unsigned int));
393static uint32 xtensa_insnbuf_get_operand
394 PARAMS ((xtensa_insnbuf, xtensa_opcode, int));
395static void xtensa_insnbuf_set_immediate_field
396 PARAMS ((xtensa_opcode, xtensa_insnbuf, int32, const char *,
397 unsigned int));
398static bfd_boolean is_negatable_branch
399 PARAMS ((TInsn *));
400
401/* Functions for Internal Lists of Symbols. */
402static void xtensa_define_label
403 PARAMS ((symbolS *));
404static void add_target_symbol
405 PARAMS ((symbolS *, bfd_boolean));
406static symbolS *xtensa_find_label
407 PARAMS ((fragS *, offsetT, bfd_boolean));
408static void map_over_defined_symbols
409 PARAMS ((void (*fn) (symbolS *)));
410static bfd_boolean is_loop_target_label
411 PARAMS ((symbolS *));
412static void xtensa_mark_target_fragments
413 PARAMS ((void));
414
415/* Various Other Internal Functions. */
416
417static bfd_boolean is_unique_insn_expansion
418 PARAMS ((TransitionRule *));
419static int xg_get_insn_size
420 PARAMS ((TInsn *));
421static int xg_get_build_instr_size
422 PARAMS ((BuildInstr *));
423static bfd_boolean xg_is_narrow_insn
424 PARAMS ((TInsn *));
425static bfd_boolean xg_is_single_relaxable_insn
426 PARAMS ((TInsn *));
427static int xg_get_max_narrow_insn_size
428 PARAMS ((xtensa_opcode));
429static int xg_get_max_insn_widen_size
430 PARAMS ((xtensa_opcode));
431static int xg_get_max_insn_widen_literal_size
432 PARAMS ((xtensa_opcode));
433static bfd_boolean xg_is_relaxable_insn
434 PARAMS ((TInsn *, int));
435static symbolS *get_special_literal_symbol
436 PARAMS ((void));
437static symbolS *get_special_label_symbol
438 PARAMS ((void));
439static bfd_boolean xg_build_to_insn
440 PARAMS ((TInsn *, TInsn *, BuildInstr *));
441static bfd_boolean xg_build_to_stack
442 PARAMS ((IStack *, TInsn *, BuildInstr *));
443static bfd_boolean xg_expand_to_stack
444 PARAMS ((IStack *, TInsn *, int));
445static bfd_boolean xg_expand_narrow
446 PARAMS ((TInsn *, TInsn *));
447static bfd_boolean xg_immeds_fit
448 PARAMS ((const TInsn *));
449static bfd_boolean xg_symbolic_immeds_fit
450 PARAMS ((const TInsn *, segT, fragS *, offsetT, long));
451static bfd_boolean xg_check_operand
452 PARAMS ((int32, xtensa_operand));
453static int is_dnrange
454 PARAMS ((fragS *, symbolS *, long));
455static int xg_assembly_relax
456 PARAMS ((IStack *, TInsn *, segT, fragS *, offsetT, int, long));
457static void xg_force_frag_space
458 PARAMS ((int));
459static void xg_finish_frag
460 PARAMS ((char *, enum xtensa_relax_statesE, int, bfd_boolean));
461static bfd_boolean is_branch_jmp_to_next
462 PARAMS ((TInsn *, fragS *));
463static void xg_add_branch_and_loop_targets
464 PARAMS ((TInsn *));
465static bfd_boolean xg_instruction_matches_rule
466 PARAMS ((TInsn *, TransitionRule *));
467static TransitionRule *xg_instruction_match
468 PARAMS ((TInsn *));
469static bfd_boolean xg_build_token_insn
470 PARAMS ((BuildInstr *, TInsn *, TInsn *));
471static bfd_boolean xg_simplify_insn
472 PARAMS ((TInsn *, TInsn *));
473static bfd_boolean xg_expand_assembly_insn
474 PARAMS ((IStack *, TInsn *));
475static symbolS *xg_assemble_literal
476 PARAMS ((TInsn *));
477static void xg_assemble_literal_space
478 PARAMS ((int));
479static symbolS *xtensa_create_literal_symbol
480 PARAMS ((segT, fragS *));
481static symbolS *xtensa_create_local_symbol
482 PARAMS ((bfd *, const char *, segT, valueT, fragS *));
483static bfd_boolean get_is_linkonce_section
484 PARAMS ((bfd *, segT));
485static bfd_boolean xg_emit_insn
486 PARAMS ((TInsn *, bfd_boolean));
487static bfd_boolean xg_emit_insn_to_buf
488 PARAMS ((TInsn *, char *, fragS *, offsetT, bfd_boolean));
489static bfd_boolean xg_add_opcode_fix
490 PARAMS ((xtensa_opcode, int, expressionS *, fragS *, offsetT));
491static void xg_resolve_literals
492 PARAMS ((TInsn *, symbolS *));
493static void xg_resolve_labels
494 PARAMS ((TInsn *, symbolS *));
495static void xg_assemble_tokens
496 PARAMS ((TInsn *));
497static bfd_boolean is_register_writer
498 PARAMS ((const TInsn *, const char *, int));
499static bfd_boolean is_bad_loopend_opcode
500 PARAMS ((const TInsn *));
501static bfd_boolean is_unaligned_label
502 PARAMS ((symbolS *));
503static fragS *next_non_empty_frag
504 PARAMS ((const fragS *));
505static xtensa_opcode next_frag_opcode
506 PARAMS ((const fragS *));
507static void update_next_frag_nop_state
508 PARAMS ((fragS *));
509static bfd_boolean next_frag_is_branch_target
510 PARAMS ((const fragS *));
511static bfd_boolean next_frag_is_loop_target
512 PARAMS ((const fragS *));
513static addressT next_frag_pre_opcode_bytes
514 PARAMS ((const fragS *));
515static bfd_boolean is_next_frag_target
516 PARAMS ((const fragS *, const fragS *));
517static void xtensa_mark_literal_pool_location
518 PARAMS ((bfd_boolean));
519static void xtensa_move_labels
520 PARAMS ((fragS *, valueT, fragS *, valueT));
521static void assemble_nop
522 PARAMS ((size_t, char *));
523static addressT get_expanded_loop_offset
524 PARAMS ((xtensa_opcode));
525static fragS *get_literal_pool_location
526 PARAMS ((segT));
527static void set_literal_pool_location
528 PARAMS ((segT, fragS *));
529
530/* Helpers for xtensa_end(). */
531
532static void xtensa_cleanup_align_frags
533 PARAMS ((void));
534static void xtensa_fix_target_frags
535 PARAMS ((void));
536static bfd_boolean frag_can_negate_branch
537 PARAMS ((fragS *));
538static void xtensa_fix_a0_b_retw_frags
539 PARAMS ((void));
540static bfd_boolean next_instrs_are_b_retw
541 PARAMS ((fragS *));
542static void xtensa_fix_b_j_loop_end_frags
543 PARAMS ((void));
544static bfd_boolean next_instr_is_loop_end
545 PARAMS ((fragS *));
546static void xtensa_fix_close_loop_end_frags
547 PARAMS ((void));
548static size_t min_bytes_to_other_loop_end
549 PARAMS ((fragS *, fragS *, offsetT, size_t));
550static size_t unrelaxed_frag_min_size
551 PARAMS ((fragS *));
552static void xtensa_fix_short_loop_frags
553 PARAMS ((void));
554static size_t count_insns_to_loop_end
555 PARAMS ((fragS *, bfd_boolean, size_t));
556static size_t unrelaxed_frag_min_insn_count
557 PARAMS ((fragS *));
558static bfd_boolean branch_before_loop_end
559 PARAMS ((fragS *));
560static bfd_boolean unrelaxed_frag_has_b_j
561 PARAMS ((fragS *));
562static void xtensa_sanity_check
563 PARAMS ((void));
564static bfd_boolean is_empty_loop
565 PARAMS ((const TInsn *, fragS *));
566static bfd_boolean is_local_forward_loop
567 PARAMS ((const TInsn *, fragS *));
568
569/* Alignment Functions. */
570
571static size_t get_text_align_power
572 PARAMS ((int));
573static addressT get_text_align_max_fill_size
574 PARAMS ((int, bfd_boolean, bfd_boolean));
575static addressT get_text_align_fill_size
576 PARAMS ((addressT, int, int, bfd_boolean, bfd_boolean));
577static size_t get_text_align_nop_count
578 PARAMS ((size_t, bfd_boolean));
579static size_t get_text_align_nth_nop_size
580 PARAMS ((size_t, size_t, bfd_boolean));
581static addressT get_noop_aligned_address
582 PARAMS ((fragS *, addressT));
583static addressT get_widen_aligned_address
584 PARAMS ((fragS *, addressT));
585
586/* Helpers for xtensa_relax_frag(). */
587
588static long relax_frag_text_align
589 PARAMS ((fragS *, long));
590static long relax_frag_add_nop
591 PARAMS ((fragS *));
592static long relax_frag_narrow
593 PARAMS ((fragS *, long));
594static bfd_boolean future_alignment_required
595 PARAMS ((fragS *, long));
596static long relax_frag_immed
597 PARAMS ((segT, fragS *, long, int, int *));
598
599/* Helpers for md_convert_frag(). */
600
601static void convert_frag_align_next_opcode
602 PARAMS ((fragS *));
603static void convert_frag_narrow
604 PARAMS ((fragS *));
605static void convert_frag_immed
606 PARAMS ((segT, fragS *, int));
607static fixS *fix_new_exp_in_seg
608 PARAMS ((segT, subsegT, fragS *, int, int, expressionS *, int,
609 bfd_reloc_code_real_type));
610static void convert_frag_immed_finish_loop
611 PARAMS ((segT, fragS *, TInsn *));
612static offsetT get_expression_value
613 PARAMS ((segT, expressionS *));
614
615/* Flags for the Last Instruction in Each Subsegment. */
616
617static unsigned get_last_insn_flags
618 PARAMS ((segT, subsegT));
619static void set_last_insn_flags
620 PARAMS ((segT, subsegT, unsigned, bfd_boolean));
621
622/* Segment list functions. */
623
624static void xtensa_remove_section
625 PARAMS ((segT));
626static void xtensa_insert_section
627 PARAMS ((segT, segT));
628static void xtensa_move_seg_list_to_beginning
629 PARAMS ((seg_list *));
630static void xtensa_move_literals
631 PARAMS ((void));
632static void xtensa_move_frag_symbol
633 PARAMS ((symbolS *));
634static void xtensa_move_frag_symbols
635 PARAMS ((void));
636static void xtensa_reorder_seg_list
637 PARAMS ((seg_list *, segT));
638static void xtensa_reorder_segments
639 PARAMS ((void));
640static segT get_last_sec
641 PARAMS ((void));
642static void xtensa_switch_to_literal_fragment
643 PARAMS ((emit_state *));
644static void xtensa_switch_section_emit_state
645 PARAMS ((emit_state *, segT, subsegT));
646static void xtensa_restore_emit_state
647 PARAMS ((emit_state *));
648static void cache_literal_section
649 PARAMS ((seg_list *, const char *, segT *));
650static segT retrieve_literal_seg
651 PARAMS ((seg_list *, const char *));
652static segT seg_present
653 PARAMS ((const char *));
654static void add_seg_list
655 PARAMS ((seg_list *, segT));
656
657/* Property Table (e.g., ".xt.insn" and ".xt.lit") Functions. */
658
659static void xtensa_create_property_segments
660 PARAMS ((frag_predicate, const char *, xt_section_type));
661static segment_info_type *retrieve_segment_info
662 PARAMS ((segT));
663static segT retrieve_xtensa_section
664 PARAMS ((char *));
665static bfd_boolean section_has_property
666 PARAMS ((segT sec, frag_predicate));
667static void add_xt_block_frags
668 PARAMS ((segT, segT, xtensa_block_info **, frag_predicate));
669static bfd_boolean get_frag_is_literal
670 PARAMS ((const fragS *));
671static bfd_boolean get_frag_is_insn
672 PARAMS ((const fragS *));
673
674/* Import from elf32-xtensa.c in BFD library. */
675extern char *xtensa_get_property_section_name
676 PARAMS ((bfd *, asection *, const char *));
677
678/* TInsn and IStack functions. */
679static bfd_boolean tinsn_has_symbolic_operands
680 PARAMS ((const TInsn *));
681static bfd_boolean tinsn_has_invalid_symbolic_operands
682 PARAMS ((const TInsn *));
683static bfd_boolean tinsn_has_complex_operands
684 PARAMS ((const TInsn *));
685static bfd_boolean tinsn_to_insnbuf
686 PARAMS ((TInsn *, xtensa_insnbuf));
687static bfd_boolean tinsn_check_arguments
688 PARAMS ((const TInsn *));
689static void tinsn_from_chars
690 PARAMS ((TInsn *, char *));
691static void tinsn_immed_from_frag
692 PARAMS ((TInsn *, fragS *));
693static int get_num_stack_text_bytes
694 PARAMS ((IStack *));
695static int get_num_stack_literal_bytes
696 PARAMS ((IStack *));
697
698/* Expression Utilities. */
699bfd_boolean expr_is_const
700 PARAMS ((const expressionS *));
701offsetT get_expr_const
702 PARAMS ((const expressionS *));
703void set_expr_const
704 PARAMS ((expressionS *, offsetT));
705void set_expr_symbol_offset
706 PARAMS ((expressionS *, symbolS *, offsetT));
707bfd_boolean expr_is_equal
708 PARAMS ((expressionS *, expressionS *));
709static void copy_expr
710 PARAMS ((expressionS *, const expressionS *));
711
712#ifdef XTENSA_SECTION_RENAME
713static void build_section_rename
714 PARAMS ((const char *));
715static void add_section_rename
716 PARAMS ((char *, char *));
717#endif
718
719#ifdef XTENSA_COMBINE_LITERALS
720static void find_lit_sym_translation
721 PARAMS ((expressionS *));
722static void add_lit_sym_translation
723 PARAMS ((char *, offsetT, symbolS *));
724#endif
725
726
727/* ISA imported from bfd. */
728extern xtensa_isa xtensa_default_isa;
729
730extern int target_big_endian;
731
732static xtensa_opcode xtensa_addi_opcode;
733static xtensa_opcode xtensa_addmi_opcode;
734static xtensa_opcode xtensa_call0_opcode;
735static xtensa_opcode xtensa_call4_opcode;
736static xtensa_opcode xtensa_call8_opcode;
737static xtensa_opcode xtensa_call12_opcode;
738static xtensa_opcode xtensa_callx0_opcode;
739static xtensa_opcode xtensa_callx4_opcode;
740static xtensa_opcode xtensa_callx8_opcode;
741static xtensa_opcode xtensa_callx12_opcode;
742static xtensa_opcode xtensa_entry_opcode;
743static xtensa_opcode xtensa_isync_opcode;
744static xtensa_opcode xtensa_j_opcode;
745static xtensa_opcode xtensa_jx_opcode;
746static xtensa_opcode xtensa_loop_opcode;
747static xtensa_opcode xtensa_loopnez_opcode;
748static xtensa_opcode xtensa_loopgtz_opcode;
749static xtensa_opcode xtensa_nop_n_opcode;
750static xtensa_opcode xtensa_or_opcode;
751static xtensa_opcode xtensa_ret_opcode;
752static xtensa_opcode xtensa_ret_n_opcode;
753static xtensa_opcode xtensa_retw_opcode;
754static xtensa_opcode xtensa_retw_n_opcode;
755static xtensa_opcode xtensa_rsr_opcode;
756static xtensa_opcode xtensa_waiti_opcode;
757
758
759
760/* Command-line Options. */
761
762bfd_boolean use_literal_section = TRUE;
763static bfd_boolean align_targets = TRUE;
764static bfd_boolean align_only_targets = FALSE;
765static bfd_boolean software_a0_b_retw_interlock = TRUE;
766static bfd_boolean has_a0_b_retw = FALSE;
767static bfd_boolean workaround_a0_b_retw = TRUE;
768
769static bfd_boolean software_avoid_b_j_loop_end = TRUE;
770static bfd_boolean workaround_b_j_loop_end = TRUE;
771static bfd_boolean maybe_has_b_j_loop_end = FALSE;
772
773static bfd_boolean software_avoid_short_loop = TRUE;
774static bfd_boolean workaround_short_loop = TRUE;
775static bfd_boolean maybe_has_short_loop = FALSE;
776
777static bfd_boolean software_avoid_close_loop_end = TRUE;
778static bfd_boolean workaround_close_loop_end = TRUE;
779static bfd_boolean maybe_has_close_loop_end = FALSE;
780
781/* When avoid_short_loops is true, all loops with early exits must
782 have at least 3 instructions. avoid_all_short_loops is a modifier
783 to the avoid_short_loop flag. In addition to the avoid_short_loop
784 actions, all straightline loopgtz and loopnez must have at least 3
785 instructions. */
786
787static bfd_boolean software_avoid_all_short_loops = TRUE;
788static bfd_boolean workaround_all_short_loops = TRUE;
789
790/* This is on a per-instruction basis. */
791static bfd_boolean specific_opcode = FALSE;
792
793enum
794{
795 option_density = OPTION_MD_BASE,
796 option_no_density,
797
798 option_relax,
799 option_no_relax,
800
801 option_generics,
802 option_no_generics,
803
804 option_text_section_literals,
805 option_no_text_section_literals,
806
807 option_align_targets,
808 option_no_align_targets,
809
810 option_align_only_targets,
811 option_no_align_only_targets,
812
813 option_longcalls,
814 option_no_longcalls,
815
816 option_workaround_a0_b_retw,
817 option_no_workaround_a0_b_retw,
818
819 option_workaround_b_j_loop_end,
820 option_no_workaround_b_j_loop_end,
821
822 option_workaround_short_loop,
823 option_no_workaround_short_loop,
824
825 option_workaround_all_short_loops,
826 option_no_workaround_all_short_loops,
827
828 option_workaround_close_loop_end,
829 option_no_workaround_close_loop_end,
830
831 option_no_workarounds,
832
833#ifdef XTENSA_SECTION_RENAME
834 option_literal_section_name,
835 option_text_section_name,
836 option_data_section_name,
837 option_bss_section_name,
838 option_rename_section_name,
839#endif
840
841 option_eb,
842 option_el
843};
844
845const char *md_shortopts = "";
846
847struct option md_longopts[] =
848{
849 {"density", no_argument, NULL, option_density},
850 {"no-density", no_argument, NULL, option_no_density},
851 /* At least as early as alameda, --[no-]relax didn't work as
852 documented, so as of albany, --[no-]relax is equivalent to
853 --[no-]generics. Both of these will be deprecated in
854 BearValley. */
855 {"relax", no_argument, NULL, option_generics},
856 {"no-relax", no_argument, NULL, option_no_generics},
857 {"generics", no_argument, NULL, option_generics},
858 {"no-generics", no_argument, NULL, option_no_generics},
859 {"text-section-literals", no_argument, NULL, option_text_section_literals},
860 {"no-text-section-literals", no_argument, NULL,
861 option_no_text_section_literals},
862 /* This option was changed from -align-target to -target-align
863 because it conflicted with the "-al" option. */
864 {"target-align", no_argument, NULL, option_align_targets},
865 {"no-target-align", no_argument, NULL,
866 option_no_align_targets},
867#if 0
868 /* This option should do a better job aligning targets because
869 it will only attempt to align targets that are the target of a
870 branch. */
871 { "target-align-only", no_argument, NULL, option_align_only_targets },
872 { "no-target-align-only", no_argument, NULL, option_no_align_only_targets },
873#endif /* 0 */
874 {"longcalls", no_argument, NULL, option_longcalls},
875 {"no-longcalls", no_argument, NULL, option_no_longcalls},
876
877 {"no-workaround-a0-b-retw", no_argument, NULL,
878 option_no_workaround_a0_b_retw},
879 {"workaround-a0-b-retw", no_argument, NULL, option_workaround_a0_b_retw},
880
881 {"no-workaround-b-j-loop-end", no_argument, NULL,
882 option_no_workaround_b_j_loop_end},
883 {"workaround-b-j-loop-end", no_argument, NULL,
884 option_workaround_b_j_loop_end},
885
886 {"no-workaround-short-loops", no_argument, NULL,
887 option_no_workaround_short_loop},
888 {"workaround-short-loops", no_argument, NULL, option_workaround_short_loop},
889
890 {"no-workaround-all-short-loops", no_argument, NULL,
891 option_no_workaround_all_short_loops},
892 {"workaround-all-short-loop", no_argument, NULL,
893 option_workaround_all_short_loops},
894
895 {"no-workaround-close-loop-end", no_argument, NULL,
896 option_no_workaround_close_loop_end},
897 {"workaround-close-loop-end", no_argument, NULL,
898 option_workaround_close_loop_end},
899
900 {"no-workarounds", no_argument, NULL, option_no_workarounds},
901
902#ifdef XTENSA_SECTION_RENAME
903 {"literal-section-name", required_argument, NULL,
904 option_literal_section_name},
905 {"text-section-name", required_argument, NULL,
906 option_text_section_name},
907 {"data-section-name", required_argument, NULL,
908 option_data_section_name},
909 {"rename-section", required_argument, NULL,
910 option_rename_section_name},
911 {"bss-section-name", required_argument, NULL,
912 option_bss_section_name},
913#endif /* XTENSA_SECTION_RENAME */
914
915 {NULL, no_argument, NULL, 0}
916};
917
918size_t md_longopts_size = sizeof md_longopts;
919
920
921int
922md_parse_option (c, arg)
923 int c;
924 char *arg;
925{
926 switch (c)
927 {
928 case option_density:
929 if (!density_supported)
930 {
931 as_bad (_("'--density' option not supported in this Xtensa "
932 "configuration"));
933 return 0;
934 }
935 directive_state[directive_density] = TRUE;
936 return 1;
937 case option_no_density:
938 directive_state[directive_density] = FALSE;
939 return 1;
940 case option_generics:
941 directive_state[directive_generics] = TRUE;
942 return 1;
943 case option_no_generics:
944 directive_state[directive_generics] = FALSE;
945 return 1;
946 case option_longcalls:
947 directive_state[directive_longcalls] = TRUE;
948 return 1;
949 case option_no_longcalls:
950 directive_state[directive_longcalls] = FALSE;
951 return 1;
952 case option_text_section_literals:
953 use_literal_section = FALSE;
954 return 1;
955 case option_no_text_section_literals:
956 use_literal_section = TRUE;
957 return 1;
958 case option_workaround_a0_b_retw:
959 workaround_a0_b_retw = TRUE;
960 software_a0_b_retw_interlock = TRUE;
961 return 1;
962 case option_no_workaround_a0_b_retw:
963 workaround_a0_b_retw = FALSE;
964 software_a0_b_retw_interlock = FALSE;
965 return 1;
966 case option_workaround_b_j_loop_end:
967 workaround_b_j_loop_end = TRUE;
968 software_avoid_b_j_loop_end = TRUE;
969 return 1;
970 case option_no_workaround_b_j_loop_end:
971 workaround_b_j_loop_end = FALSE;
972 software_avoid_b_j_loop_end = FALSE;
973 return 1;
974
975 case option_workaround_short_loop:
976 workaround_short_loop = TRUE;
977 software_avoid_short_loop = TRUE;
978 return 1;
979 case option_no_workaround_short_loop:
980 workaround_short_loop = FALSE;
981 software_avoid_short_loop = FALSE;
982 return 1;
983
984 case option_workaround_all_short_loops:
985 workaround_all_short_loops = TRUE;
986 software_avoid_all_short_loops = TRUE;
987 return 1;
988 case option_no_workaround_all_short_loops:
989 workaround_all_short_loops = FALSE;
990 software_avoid_all_short_loops = FALSE;
991 return 1;
992
993 case option_workaround_close_loop_end:
994 workaround_close_loop_end = TRUE;
995 software_avoid_close_loop_end = TRUE;
996 return 1;
997 case option_no_workaround_close_loop_end:
998 workaround_close_loop_end = FALSE;
999 software_avoid_close_loop_end = FALSE;
1000 return 1;
1001
1002 case option_no_workarounds:
1003 workaround_a0_b_retw = FALSE;
1004 software_a0_b_retw_interlock = FALSE;
1005 workaround_b_j_loop_end = FALSE;
1006 software_avoid_b_j_loop_end = FALSE;
1007 workaround_short_loop = FALSE;
1008 software_avoid_short_loop = FALSE;
1009 workaround_all_short_loops = FALSE;
1010 software_avoid_all_short_loops = FALSE;
1011 workaround_close_loop_end = FALSE;
1012 software_avoid_close_loop_end = FALSE;
1013 return 1;
1014
1015 case option_align_targets:
1016 align_targets = TRUE;
1017 return 1;
1018 case option_no_align_targets:
1019 align_targets = FALSE;
1020 return 1;
1021
1022 case option_align_only_targets:
1023 align_only_targets = TRUE;
1024 return 1;
1025 case option_no_align_only_targets:
1026 align_only_targets = FALSE;
1027 return 1;
1028
1029#ifdef XTENSA_SECTION_RENAME
1030 case option_literal_section_name:
1031 add_section_rename (".literal", arg);
1032 as_warn (_("'--literal-section-name' is deprecated; "
1033 "use '--rename-section .literal=NEWNAME'"));
1034 return 1;
1035
1036 case option_text_section_name:
1037 add_section_rename (".text", arg);
1038 as_warn (_("'--text-section-name' is deprecated; "
1039 "use '--rename-section .text=NEWNAME'"));
1040 return 1;
1041
1042 case option_data_section_name:
1043 add_section_rename (".data", arg);
1044 as_warn (_("'--data-section-name' is deprecated; "
1045 "use '--rename-section .data=NEWNAME'"));
1046 return 1;
1047
1048 case option_bss_section_name:
1049 add_section_rename (".bss", arg);
1050 as_warn (_("'--bss-section-name' is deprecated; "
1051 "use '--rename-section .bss=NEWNAME'"));
1052 return 1;
1053
1054 case option_rename_section_name:
1055 build_section_rename (arg);
1056 return 1;
1057#endif /* XTENSA_SECTION_RENAME */
1058
1059 case 'Q':
1060 /* -Qy, -Qn: SVR4 arguments controlling whether a .comment section
1061 should be emitted or not. FIXME: Not implemented. */
1062 return 1;
1063
1064 default:
1065 return 0;
1066 }
1067}
1068
1069
1070void
1071md_show_usage (stream)
1072 FILE *stream;
1073{
1074 fputs ("\nXtensa options:\n"
1075 "--[no-]density [Do not] emit density instructions\n"
1076 "--[no-]relax [Do not] perform branch relaxation\n"
1077 "--[no-]generics [Do not] transform instructions\n"
1078 "--[no-]longcalls [Do not] emit 32-bit call sequences\n"
1079 "--[no-]target-align [Do not] try to align branch targets\n"
1080 "--[no-]text-section-literals\n"
1081 " [Do not] put literals in the text section\n"
1082 "--no-workarounds Do not use any Xtensa workarounds\n"
1083#ifdef XTENSA_SECTION_RENAME
1084 "--rename-section old=new(:old1=new1)*\n"
1085 " Rename section 'old' to 'new'\n"
1086 "\nThe following Xtensa options are deprecated\n"
1087 "--literal-section-name Name of literal section (default .literal)\n"
1088 "--text-section-name Name of text section (default .text)\n"
1089 "--data-section-name Name of data section (default .data)\n"
1090 "--bss-section-name Name of bss section (default .bss)\n"
1091#endif
1092 , stream);
1093}
1094
1095
1096
1097/* Directive data and functions. */
1098
1099typedef struct state_stackS_struct
1100{
1101 directiveE directive;
1102 bfd_boolean negated;
1103 bfd_boolean old_state;
1104 const char *file;
1105 unsigned int line;
1106 const void *datum;
1107 struct state_stackS_struct *prev;
1108} state_stackS;
1109
1110state_stackS *directive_state_stack;
1111
1112const pseudo_typeS md_pseudo_table[] =
1113{
1114 {"align", s_align_bytes, 0}, /* Defaulting is invalid (0) */
1115 {"literal_position", xtensa_literal_position, 0},
1116 {"frame", s_ignore, 0}, /* formerly used for STABS debugging */
1117 {"word", cons, 4},
1118 {"begin", xtensa_begin_directive, 0},
1119 {"end", xtensa_end_directive, 0},
1120 {"file", (void (*) PARAMS ((int))) dwarf2_directive_file, 0},
1121 {"loc", dwarf2_directive_loc, 0},
1122 {"literal", xtensa_literal_pseudo, 0},
1123 {NULL, 0, 0},
1124};
1125
1126
1127bfd_boolean
1128use_generics ()
1129{
1130 return directive_state[directive_generics];
1131}
1132
1133
1134bfd_boolean
1135use_longcalls ()
1136{
1137 return directive_state[directive_longcalls];
1138}
1139
1140
1141bfd_boolean
1142code_density_available ()
1143{
1144 return directive_state[directive_density];
1145}
1146
1147
1148bfd_boolean
1149can_relax ()
1150{
1151 return use_generics ();
1152}
1153
1154
1155static void
1156directive_push (directive, negated, datum)
1157 directiveE directive;
1158 bfd_boolean negated;
1159 const void *datum;
1160{
1161 char *file;
1162 unsigned int line;
1163 state_stackS *stack = (state_stackS *) xmalloc (sizeof (state_stackS));
1164
1165 as_where (&file, &line);
1166
1167 stack->directive = directive;
1168 stack->negated = negated;
1169 stack->old_state = directive_state[directive];
1170 stack->file = file;
1171 stack->line = line;
1172 stack->datum = datum;
1173 stack->prev = directive_state_stack;
1174 directive_state_stack = stack;
1175
1176 directive_state[directive] = !negated;
1177}
1178
1179static void
1180directive_pop (directive, negated, file, line, datum)
1181 directiveE *directive;
1182 bfd_boolean *negated;
1183 const char **file;
1184 unsigned int *line;
1185 const void **datum;
1186{
1187 state_stackS *top = directive_state_stack;
1188
1189 if (!directive_state_stack)
1190 {
1191 as_bad (_("unmatched end directive"));
1192 *directive = directive_none;
1193 return;
1194 }
1195
1196 directive_state[directive_state_stack->directive] = top->old_state;
1197 *directive = top->directive;
1198 *negated = top->negated;
1199 *file = top->file;
1200 *line = top->line;
1201 *datum = top->datum;
1202 directive_state_stack = top->prev;
1203 free (top);
1204}
1205
1206
1207static void
1208directive_balance ()
1209{
1210 while (directive_state_stack)
1211 {
1212 directiveE directive;
1213 bfd_boolean negated;
1214 const char *file;
1215 unsigned int line;
1216 const void *datum;
1217
1218 directive_pop (&directive, &negated, &file, &line, &datum);
1219 as_warn_where ((char *) file, line,
1220 _(".begin directive with no matching .end directive"));
1221 }
1222}
1223
1224
1225static bfd_boolean
1226inside_directive (dir)
1227 directiveE dir;
1228{
1229 state_stackS *top = directive_state_stack;
1230
1231 while (top && top->directive != dir)
1232 top = top->prev;
1233
1234 return (top != NULL);
1235}
1236
1237
1238static void
1239get_directive (directive, negated)
1240 directiveE *directive;
1241 bfd_boolean *negated;
1242{
1243 int len;
1244 unsigned i;
1245
1246 if (strncmp (input_line_pointer, "no-", 3) != 0)
1247 *negated = FALSE;
1248 else
1249 {
1250 *negated = TRUE;
1251 input_line_pointer += 3;
1252 }
1253
1254 len = strspn (input_line_pointer,
1255 "abcdefghijklmnopqrstuvwxyz_/0123456789.");
1256
1257 for (i = 0; i < sizeof (directive_info) / sizeof (*directive_info); ++i)
1258 {
1259 if (strncmp (input_line_pointer, directive_info[i].name, len) == 0)
1260 {
1261 input_line_pointer += len;
1262 *directive = (directiveE) i;
1263 if (*negated && !directive_info[i].can_be_negated)
1264 as_bad (_("directive %s can't be negated"),
1265 directive_info[i].name);
1266 return;
1267 }
1268 }
1269
1270 as_bad (_("unknown directive"));
1271 *directive = (directiveE) XTENSA_UNDEFINED;
1272}
1273
1274
1275static void
1276xtensa_begin_directive (ignore)
1277 int ignore ATTRIBUTE_UNUSED;
1278{
1279 directiveE directive;
1280 bfd_boolean negated;
1281 emit_state *state;
1282 int len;
1283 lit_state *ls;
1284
1285 get_directive (&directive, &negated);
1286 if (directive == (directiveE) XTENSA_UNDEFINED)
1287 {
1288 discard_rest_of_line ();
1289 return;
1290 }
1291
1292 switch (directive)
1293 {
1294 case directive_literal:
1295 state = (emit_state *) xmalloc (sizeof (emit_state));
1296 xtensa_switch_to_literal_fragment (state);
1297 directive_push (directive_literal, negated, state);
1298 break;
1299
1300 case directive_literal_prefix:
1301 /* Check to see if the current fragment is a literal
1302 fragment. If it is, then this operation is not allowed. */
1303 if (frag_now->tc_frag_data.is_literal)
1304 {
1305 as_bad (_("cannot set literal_prefix inside literal fragment"));
1306 return;
1307 }
1308
1309 /* Allocate the literal state for this section and push
1310 onto the directive stack. */
1311 ls = xmalloc (sizeof (lit_state));
1312 assert (ls);
1313
1314 *ls = default_lit_sections;
1315
1316 directive_push (directive_literal_prefix, negated, ls);
1317
1318 /* Parse the new prefix from the input_line_pointer. */
1319 SKIP_WHITESPACE ();
1320 len = strspn (input_line_pointer,
1321 "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1322 "abcdefghijklmnopqrstuvwxyz_/0123456789.$");
1323
1324 /* Process the new prefix. */
1325 xtensa_literal_prefix (input_line_pointer, len);
1326
1327 /* Skip the name in the input line. */
1328 input_line_pointer += len;
1329 break;
1330
1331 case directive_freeregs:
1332 /* This information is currently unused, but we'll accept the statement
1333 and just discard the rest of the line. This won't check the syntax,
1334 but it will accept every correct freeregs directive. */
1335 input_line_pointer += strcspn (input_line_pointer, "\n");
1336 directive_push (directive_freeregs, negated, 0);
1337 break;
1338
1339 case directive_density:
1340 if (!density_supported && !negated)
1341 {
1342 as_warn (_("Xtensa density option not supported; ignored"));
1343 break;
1344 }
1345 /* fall through */
1346
1347 default:
1348 directive_push (directive, negated, 0);
1349 break;
1350 }
1351
1352 demand_empty_rest_of_line ();
1353}
1354
1355
1356static void
1357xtensa_end_directive (ignore)
1358 int ignore ATTRIBUTE_UNUSED;
1359{
1360 directiveE begin_directive, end_directive;
1361 bfd_boolean begin_negated, end_negated;
1362 const char *file;
1363 unsigned int line;
1364 emit_state *state;
1365 lit_state *s;
1366
1367 get_directive (&end_directive, &end_negated);
1368 if (end_directive == (directiveE) XTENSA_UNDEFINED)
1369 {
1370 discard_rest_of_line ();
1371 return;
1372 }
1373
1374 if (end_directive == directive_density && !density_supported && !end_negated)
1375 {
1376 as_warn (_("Xtensa density option not supported; ignored"));
1377 demand_empty_rest_of_line ();
1378 return;
1379 }
1380
1381 directive_pop (&begin_directive, &begin_negated, &file, &line,
1382 (const void **) &state);
1383
1384 if (begin_directive != directive_none)
1385 {
1386 if (begin_directive != end_directive || begin_negated != end_negated)
1387 {
1388 as_bad (_("does not match begin %s%s at %s:%d"),
1389 begin_negated ? "no-" : "",
1390 directive_info[begin_directive].name, file, line);
1391 }
1392 else
1393 {
1394 switch (end_directive)
1395 {
1396 case directive_literal:
1397 frag_var (rs_fill, 0, 0, 0, NULL, 0, NULL);
1398 xtensa_restore_emit_state (state);
1399 free (state);
1400 break;
1401
1402 case directive_freeregs:
1403 break;
1404
1405 case directive_literal_prefix:
1406 /* Restore the default collection sections from saved state. */
1407 s = (lit_state *) state;
1408 assert (s);
1409
1410 if (use_literal_section)
1411 default_lit_sections = *s;
1412
1413 /* free the state storage */
1414 free (s);
1415 break;
1416
1417 default:
1418 break;
1419 }
1420 }
1421 }
1422
1423 demand_empty_rest_of_line ();
1424}
1425
1426
1427/* Place an aligned literal fragment at the current location. */
1428
1429static void
1430xtensa_literal_position (ignore)
1431 int ignore ATTRIBUTE_UNUSED;
1432{
1433 if (inside_directive (directive_literal))
1434 as_warn (_(".literal_position inside literal directive; ignoring"));
1435 else if (!use_literal_section)
1436 xtensa_mark_literal_pool_location (FALSE);
1437
1438 demand_empty_rest_of_line ();
1439}
1440
1441
1442/* Support .literal label, value@plt + offset. */
1443
1444static void
1445xtensa_literal_pseudo (ignored)
1446 int ignored ATTRIBUTE_UNUSED;
1447{
1448 emit_state state;
1449 char *base_name;
1450#ifdef XTENSA_COMBINE_LITERALS
1451 char *next_name;
1452 symbolS *duplicate;
1453 bfd_boolean used_name = FALSE;
1454 int offset = 0;
1455#endif
1456 char c;
1457 char *p;
1458 expressionS expP;
1459 segT dest_seg;
1460
1461 /* If we are using text-section literals, then this is the right value... */
1462 dest_seg = now_seg;
1463
1464 base_name = input_line_pointer;
1465
1466 xtensa_switch_to_literal_fragment (&state);
1467
1468 /* ...but if we aren't using text-section-literals, then we
1469 need to put them in the section we just switched to. */
1470 if (use_literal_section)
1471 dest_seg = now_seg;
1472
1473 /* All literals are aligned to four-byte boundaries
1474 which is handled by switch to literal fragment. */
1475 /* frag_align (2, 0, 0); */
1476
1477 c = get_symbol_end ();
1478 /* Just after name is now '\0'. */
1479 p = input_line_pointer;
1480 *p = c;
1481 SKIP_WHITESPACE ();
1482
1483 if (*input_line_pointer != ',' && *input_line_pointer != ':')
1484 {
1485 as_bad (_("expected comma or colon after symbol name; "
1486 "rest of line ignored"));
1487 ignore_rest_of_line ();
1488 xtensa_restore_emit_state (&state);
1489 return;
1490 }
1491 *p = 0;
1492
1493#ifdef XTENSA_COMBINE_LITERALS
1494 /* We need next name to start out equal to base_name,
1495 but we modify it later to refer to a symbol and an offset. */
1496 next_name = xmalloc (strlen (base_name) + 1);
1497 strcpy (next_name, base_name);
1498
1499 /* We need a copy of base_name because we refer to it in the
1500 lit_sym_translations and the source is somewhere in the input stream. */
1501 base_name = xmalloc (strlen (base_name) + 1);
1502 strcpy (base_name, next_name);
1503
1504#else
1505
1506 colon (base_name);
1507#endif
1508
1509 do
1510 {
1511 input_line_pointer++; /* skip ',' or ':' */
1512
1513 expr (0, &expP);
1514
1515#ifdef XTENSA_COMBINE_LITERALS
1516 duplicate = is_duplicate_literal (&expP, dest_seg);
1517 if (duplicate)
1518 {
1519 add_lit_sym_translation (base_name, offset, duplicate);
1520 used_name = TRUE;
1521 continue;
1522 }
1523 colon (next_name);
1524#endif
1525
1526 /* We only support 4-byte literals with .literal. */
1527 emit_expr (&expP, 4);
1528
1529#ifdef XTENSA_COMBINE_LITERALS
1530 cache_literal (next_name, &expP, dest_seg);
1531 free (next_name);
1532
1533 if (*input_line_pointer == ',')
1534 {
1535 offset += 4;
1536 next_name = xmalloc (strlen (base_name) +
1537 strlen (XTENSA_LIT_PLUS_OFFSET) + 10);
1538 sprintf (next_name, "%s%s%d",
1539 XTENSA_LIT_PLUS_OFFSET, base_name, offset);
1540 }
1541#endif
1542 }
1543 while (*input_line_pointer == ',');
1544
1545 *p = c;
1546#ifdef XTENSA_COMBINE_LITERALS
1547 if (!used_name)
1548 free (base_name);
1549#endif
1550
1551 demand_empty_rest_of_line ();
1552
1553 xtensa_restore_emit_state (&state);
1554}
1555
1556
1557static void
1558xtensa_literal_prefix (start, len)
1559 char const *start;
1560 int len;
1561{
1562 segT s_now; /* Storage for the current seg and subseg. */
1563 subsegT ss_now;
1564 char *name; /* Pointer to the name itself. */
1565 char *newname;
1566
1567 if (!use_literal_section)
1568 return;
1569
1570 /* Store away the current section and subsection. */
1571 s_now = now_seg;
1572 ss_now = now_subseg;
1573
1574 /* Get a null-terminated copy of the name. */
1575 name = xmalloc (len + 1);
1576 assert (name);
1577
1578 strncpy (name, start, len);
1579 name[len] = 0;
1580
1581 /* Allocate the sections (interesting note: the memory pointing to
1582 the name is actually used for the name by the new section). */
1583 newname = xmalloc (len + strlen (".literal") + 1);
1584 strcpy (newname, name);
1585 strcpy (newname + len, ".literal");
1586
1587 /* Note that retrieve_literal_seg does not create a segment if
1588 it already exists. */
1589 default_lit_sections.lit_seg = NULL; /* retrieved on demand */
1590
1591 /* Canonicalizing section names allows renaming literal
1592 sections to occur correctly. */
1593 default_lit_sections.lit_seg_name =
1594 tc_canonicalize_symbol_name (newname);
1595
1596 free (name);
1597
1598 /* Restore the current section and subsection and set the
1599 generation into the old segment. */
1600 subseg_set (s_now, ss_now);
1601}
1602
1603
1604
1605/* Parsing and Idiom Translation. */
1606
1607static const char *
1608expression_end (name)
1609 const char *name;
1610{
1611 while (1)
1612 {
1613 switch (*name)
1614 {
1615 case ';':
1616 case '\0':
1617 case ',':
1618 return name;
1619 case ' ':
1620 case '\t':
1621 ++name;
1622 continue;
1623 default:
1624 return 0;
1625 }
1626 }
1627}
1628
1629
1630#define ERROR_REG_NUM ((unsigned) -1)
1631
1632static unsigned
1633tc_get_register (prefix)
1634 const char *prefix;
1635{
1636 unsigned reg;
1637 const char *next_expr;
1638 const char *old_line_pointer;
1639
1640 SKIP_WHITESPACE ();
1641 old_line_pointer = input_line_pointer;
1642
1643 if (*input_line_pointer == '$')
1644 ++input_line_pointer;
1645
1646 /* Accept "sp" as a synonym for "a1". */
1647 if (input_line_pointer[0] == 's' && input_line_pointer[1] == 'p'
1648 && expression_end (input_line_pointer + 2))
1649 {
1650 input_line_pointer += 2;
1651 return 1; /* AR[1] */
1652 }
1653
1654 while (*input_line_pointer++ == *prefix++)
1655 ;
1656 --input_line_pointer;
1657 --prefix;
1658
1659 if (*prefix)
1660 {
1661 as_bad (_("bad register name: %s"), old_line_pointer);
1662 return ERROR_REG_NUM;
1663 }
1664
1665 if (!ISDIGIT ((unsigned char) *input_line_pointer))
1666 {
1667 as_bad (_("bad register number: %s"), input_line_pointer);
1668 return ERROR_REG_NUM;
1669 }
1670
1671 reg = 0;
1672
1673 while (ISDIGIT ((int) *input_line_pointer))
1674 reg = reg * 10 + *input_line_pointer++ - '0';
1675
1676 if (!(next_expr = expression_end (input_line_pointer)))
1677 {
1678 as_bad (_("bad register name: %s"), old_line_pointer);
1679 return ERROR_REG_NUM;
1680 }
1681
1682 input_line_pointer = (char *) next_expr;
1683
1684 return reg;
1685}
1686
1687
1688#define PLT_SUFFIX "@PLT"
1689#define plt_suffix "@plt"
1690
1691static void
1692expression_maybe_register (opnd, tok)
1693 xtensa_operand opnd;
1694 expressionS *tok;
1695{
1696 char *kind = xtensa_operand_kind (opnd);
1697
1698 if ((strlen (kind) == 1)
1699 && (*kind == 'l' || *kind == 'L' || *kind == 'i' || *kind == 'r'))
1700 {
1701 segT t = expression (tok);
1702 if (t == absolute_section && operand_is_pcrel_label (opnd))
1703 {
1704 assert (tok->X_op == O_constant);
1705 tok->X_op = O_symbol;
1706 tok->X_add_symbol = &abs_symbol;
1707 }
1708 if (tok->X_op == O_symbol
1709 && (!strncmp (input_line_pointer, PLT_SUFFIX,
1710 strlen (PLT_SUFFIX) - 1)
1711 || !strncmp (input_line_pointer, plt_suffix,
1712 strlen (plt_suffix) - 1)))
1713 {
1714 tok->X_add_symbol->sy_tc.plt = 1;
1715 input_line_pointer += strlen (plt_suffix);
1716 }
1717#ifdef XTENSA_COMBINE_LITERALS
1718 find_lit_sym_translation (tok);
1719#endif
1720 }
1721 else
1722 {
1723 unsigned reg = tc_get_register (kind);
1724
1725 if (reg != ERROR_REG_NUM) /* Already errored */
1726 {
1727 uint32 buf = reg;
1728 if ((xtensa_operand_encode (opnd, &buf) != xtensa_encode_result_ok)
1729 || (reg != xtensa_operand_decode (opnd, buf)))
1730 as_bad (_("register number out of range"));
1731 }
1732
1733 tok->X_op = O_register;
1734 tok->X_add_symbol = 0;
1735 tok->X_add_number = reg;
1736 }
1737}
1738
1739
1740/* Split up the arguments for an opcode or pseudo-op. */
1741
1742static int
1743tokenize_arguments (args, str)
1744 char **args;
1745 char *str;
1746{
1747 char *old_input_line_pointer;
1748 bfd_boolean saw_comma = FALSE;
1749 bfd_boolean saw_arg = FALSE;
1750 int num_args = 0;
1751 char *arg_end, *arg;
1752 int arg_len;
1753
1754 /* Save and restore input_line_pointer around this function. */
1755 old_input_line_pointer = input_line_pointer;
1756 input_line_pointer = str;
1757
1758 while (*input_line_pointer)
1759 {
1760 SKIP_WHITESPACE ();
1761 switch (*input_line_pointer)
1762 {
1763 case '\0':
1764 goto fini;
1765
1766 case ',':
1767 input_line_pointer++;
1768 if (saw_comma || !saw_arg)
1769 goto err;
1770 saw_comma = TRUE;
1771 break;
1772
1773 default:
1774 if (!saw_comma && saw_arg)
1775 goto err;
1776
1777 arg_end = input_line_pointer + 1;
1778 while (!expression_end (arg_end))
1779 arg_end += 1;
1780
1781 arg_len = arg_end - input_line_pointer;
1782 arg = (char *) xmalloc (arg_len + 1);
1783 args[num_args] = arg;
1784
1785 strncpy (arg, input_line_pointer, arg_len);
1786 arg[arg_len] = '\0';
1787
1788 input_line_pointer = arg_end;
1789 num_args += 1;
1790 saw_comma = FALSE;
1791 saw_arg = TRUE;
1792 break;
1793 }
1794 }
1795
1796fini:
1797 if (saw_comma)
1798 goto err;
1799 input_line_pointer = old_input_line_pointer;
1800 return num_args;
1801
1802err:
1803 input_line_pointer = old_input_line_pointer;
1804 return -1;
1805}
1806
1807
1808/* Parse the arguments to an opcode. Return true on error. */
1809
1810static bfd_boolean
1811parse_arguments (insn, num_args, arg_strings)
1812 TInsn *insn;
1813 int num_args;
1814 char **arg_strings;
1815{
1816 expressionS *tok = insn->tok;
1817 xtensa_opcode opcode = insn->opcode;
1818 bfd_boolean had_error = TRUE;
1819 xtensa_isa isa = xtensa_default_isa;
1820 int n;
1821 int opcode_operand_count;
1822 int actual_operand_count = 0;
1823 xtensa_operand opnd = NULL;
1824 char *old_input_line_pointer;
1825
1826 if (insn->insn_type == ITYPE_LITERAL)
1827 opcode_operand_count = 1;
1828 else
1829 opcode_operand_count = xtensa_num_operands (isa, opcode);
1830
1831 memset (tok, 0, sizeof (*tok) * MAX_INSN_ARGS);
1832
1833 /* Save and restore input_line_pointer around this function. */
1834 old_input_line_pointer = input_line_pointer;
1835
1836 for (n = 0; n < num_args; n++)
1837 {
1838 input_line_pointer = arg_strings[n];
1839
1840 if (actual_operand_count >= opcode_operand_count)
1841 {
1842 as_warn (_("too many arguments"));
1843 goto err;
1844 }
1845 assert (actual_operand_count < MAX_INSN_ARGS);
1846
1847 opnd = xtensa_get_operand (isa, opcode, actual_operand_count);
1848 expression_maybe_register (opnd, tok);
1849
1850 if (tok->X_op == O_illegal || tok->X_op == O_absent)
1851 goto err;
1852 actual_operand_count++;
1853 tok++;
1854 }
1855
1856 insn->ntok = tok - insn->tok;
1857 had_error = FALSE;
1858
1859 err:
1860 input_line_pointer = old_input_line_pointer;
1861 return had_error;
1862}
1863
1864
1865static void
1866xg_reverse_shift_count (cnt_argp)
1867 char **cnt_argp;
1868{
1869 char *cnt_arg, *new_arg;
1870 cnt_arg = *cnt_argp;
1871
1872 /* replace the argument with "31-(argument)" */
1873 new_arg = (char *) xmalloc (strlen (cnt_arg) + 6);
1874 sprintf (new_arg, "31-(%s)", cnt_arg);
1875
1876 free (cnt_arg);
1877 *cnt_argp = new_arg;
1878}
1879
1880
1881/* If "arg" is a constant expression, return non-zero with the value
1882 in *valp. */
1883
1884static int
1885xg_arg_is_constant (arg, valp)
1886 char *arg;
1887 offsetT *valp;
1888{
1889 expressionS exp;
1890 char *save_ptr = input_line_pointer;
1891
1892 input_line_pointer = arg;
1893 expression (&exp);
1894 input_line_pointer = save_ptr;
1895
1896 if (exp.X_op == O_constant)
1897 {
1898 *valp = exp.X_add_number;
1899 return 1;
1900 }
1901
1902 return 0;
1903}
1904
1905
1906static void
1907xg_replace_opname (popname, newop)
1908 char **popname;
1909 char *newop;
1910{
1911 free (*popname);
1912 *popname = (char *) xmalloc (strlen (newop) + 1);
1913 strcpy (*popname, newop);
1914}
1915
1916
1917static int
1918xg_check_num_args (pnum_args, expected_num, opname, arg_strings)
1919 int *pnum_args;
1920 int expected_num;
1921 char *opname;
1922 char **arg_strings;
1923{
1924 int num_args = *pnum_args;
1925
1926 if (num_args < expected_num)
1927 {
1928 as_bad (_("not enough operands (%d) for '%s'; expected %d"),
1929 num_args, opname, expected_num);
1930 return -1;
1931 }
1932
1933 if (num_args > expected_num)
1934 {
1935 as_warn (_("too many operands (%d) for '%s'; expected %d"),
1936 num_args, opname, expected_num);
1937 while (num_args-- > expected_num)
1938 {
1939 free (arg_strings[num_args]);
1940 arg_strings[num_args] = 0;
1941 }
1942 *pnum_args = expected_num;
1943 return -1;
1944 }
1945
1946 return 0;
1947}
1948
1949
1950static int
1951xg_translate_sysreg_op (popname, pnum_args, arg_strings)
1952 char **popname;
1953 int *pnum_args;
1954 char **arg_strings;
1955{
1956 char *opname, *new_opname;
1957 offsetT val;
1958 bfd_boolean has_underbar = FALSE;
1959
1960 opname = *popname;
1961 if (*opname == '_')
1962 {
1963 has_underbar = TRUE;
1964 opname += 1;
1965 }
1966
1967 /* Opname == [rw]ur... */
1968
1969 if (opname[3] == '\0')
1970 {
1971 /* If the register is not specified as part of the opcode,
1972 then get it from the operand and move it to the opcode. */
1973
1974 if (xg_check_num_args (pnum_args, 2, opname, arg_strings))
1975 return -1;
1976
1977 if (!xg_arg_is_constant (arg_strings[1], &val))
1978 {
1979 as_bad (_("register number for `%s' is not a constant"), opname);
1980 return -1;
1981 }
1982 if ((unsigned) val > 255)
1983 {
1984 as_bad (_("register number (%ld) for `%s' is out of range"),
1985 val, opname);
1986 return -1;
1987 }
1988
1989 /* Remove the last argument, which is now part of the opcode. */
1990 free (arg_strings[1]);
1991 arg_strings[1] = 0;
1992 *pnum_args = 1;
1993
1994 /* Translate the opcode. */
1995 new_opname = (char *) xmalloc (8);
1996 sprintf (new_opname, "%s%cur%u", (has_underbar ? "_" : ""),
1997 opname[0], (unsigned) val);
1998 free (*popname);
1999 *popname = new_opname;
2000 }
2001
2002 return 0;
2003}
2004
2005
2006/* If the instruction is an idiom (i.e., a built-in macro), translate it.
2007 Returns non-zero if an error was found. */
2008
2009static int
2010xg_translate_idioms (popname, pnum_args, arg_strings)
2011 char **popname;
2012 int *pnum_args;
2013 char **arg_strings;
2014{
2015 char *opname = *popname;
2016 bfd_boolean has_underbar = FALSE;
2017
2018 if (*opname == '_')
2019 {
2020 has_underbar = TRUE;
2021 opname += 1;
2022 }
2023
2024 if (strcmp (opname, "mov") == 0)
2025 {
2026 if (!has_underbar && code_density_available ())
2027 xg_replace_opname (popname, "mov.n");
2028 else
2029 {
2030 if (xg_check_num_args (pnum_args, 2, opname, arg_strings))
2031 return -1;
2032 xg_replace_opname (popname, (has_underbar ? "_or" : "or"));
2033 arg_strings[2] = (char *) xmalloc (strlen (arg_strings[1]) + 1);
2034 strcpy (arg_strings[2], arg_strings[1]);
2035 *pnum_args = 3;
2036 }
2037 return 0;
2038 }
2039
2040 if (strcmp (opname, "bbsi.l") == 0)
2041 {
2042 if (xg_check_num_args (pnum_args, 3, opname, arg_strings))
2043 return -1;
2044 xg_replace_opname (popname, (has_underbar ? "_bbsi" : "bbsi"));
2045 if (target_big_endian)
2046 xg_reverse_shift_count (&arg_strings[1]);
2047 return 0;
2048 }
2049
2050 if (strcmp (opname, "bbci.l") == 0)
2051 {
2052 if (xg_check_num_args (pnum_args, 3, opname, arg_strings))
2053 return -1;
2054 xg_replace_opname (popname, (has_underbar ? "_bbci" : "bbci"));
2055 if (target_big_endian)
2056 xg_reverse_shift_count (&arg_strings[1]);
2057 return 0;
2058 }
2059
2060 if (strcmp (opname, "nop") == 0)
2061 {
2062 if (!has_underbar && code_density_available ())
2063 xg_replace_opname (popname, "nop.n");
2064 else
2065 {
2066 if (xg_check_num_args (pnum_args, 0, opname, arg_strings))
2067 return -1;
2068 xg_replace_opname (popname, (has_underbar ? "_or" : "or"));
2069 arg_strings[0] = (char *) xmalloc (3);
2070 arg_strings[1] = (char *) xmalloc (3);
2071 arg_strings[2] = (char *) xmalloc (3);
2072 strcpy (arg_strings[0], "a1");
2073 strcpy (arg_strings[1], "a1");
2074 strcpy (arg_strings[2], "a1");
2075 *pnum_args = 3;
2076 }
2077 return 0;
2078 }
2079
2080 if ((opname[0] == 'r' || opname[0] == 'w')
2081 && opname[1] == 'u'
2082 && opname[2] == 'r')
2083 return xg_translate_sysreg_op (popname, pnum_args, arg_strings);
2084
2085
2086 /* WIDENING DENSITY OPCODES
2087
2088 questionable relaxations (widening) from old "tai" idioms:
2089
2090 ADD.N --> ADD
2091 BEQZ.N --> BEQZ
2092 RET.N --> RET
2093 RETW.N --> RETW
2094 MOVI.N --> MOVI
2095 MOV.N --> MOV
2096 NOP.N --> NOP
2097
2098 Note: this incomplete list was imported to match the "tai"
2099 behavior; other density opcodes are not handled.
2100
2101 The xtensa-relax code may know how to do these but it doesn't do
2102 anything when these density opcodes appear inside a no-density
2103 region. Somehow GAS should either print an error when that happens
2104 or do the widening. The old "tai" behavior was to do the widening.
2105 For now, I'll make it widen but print a warning.
2106
2107 FIXME: GAS needs to detect density opcodes inside no-density
2108 regions and treat them as errors. This code should be removed
2109 when that is done. */
2110
2111 if (use_generics ()
2112 && !has_underbar
2113 && density_supported
2114 && !code_density_available ())
2115 {
2116 if (strcmp (opname, "add.n") == 0)
2117 xg_replace_opname (popname, "add");
2118
2119 else if (strcmp (opname, "beqz.n") == 0)
2120 xg_replace_opname (popname, "beqz");
2121
2122 else if (strcmp (opname, "ret.n") == 0)
2123 xg_replace_opname (popname, "ret");
2124
2125 else if (strcmp (opname, "retw.n") == 0)
2126 xg_replace_opname (popname, "retw");
2127
2128 else if (strcmp (opname, "movi.n") == 0)
2129 xg_replace_opname (popname, "movi");
2130
2131 else if (strcmp (opname, "mov.n") == 0)
2132 {
2133 if (xg_check_num_args (pnum_args, 2, opname, arg_strings))
2134 return -1;
2135 xg_replace_opname (popname, "or");
2136 arg_strings[2] = (char *) xmalloc (strlen (arg_strings[1]) + 1);
2137 strcpy (arg_strings[2], arg_strings[1]);
2138 *pnum_args = 3;
2139 }
2140
2141 else if (strcmp (opname, "nop.n") == 0)
2142 {
2143 if (xg_check_num_args (pnum_args, 0, opname, arg_strings))
2144 return -1;
2145 xg_replace_opname (popname, "or");
2146 arg_strings[0] = (char *) xmalloc (3);
2147 arg_strings[1] = (char *) xmalloc (3);
2148 arg_strings[2] = (char *) xmalloc (3);
2149 strcpy (arg_strings[0], "a1");
2150 strcpy (arg_strings[1], "a1");
2151 strcpy (arg_strings[2], "a1");
2152 *pnum_args = 3;
2153 }
2154 }
2155
2156 return 0;
2157}
2158
2159
2160
2161/* Functions for dealing with the Xtensa ISA. */
2162
2163/* Return true if the given operand is an immed or target instruction,
2164 i.e., has a reloc associated with it. Currently, this is only true
2165 if the operand kind is "i, "l" or "L". */
2166
2167static bfd_boolean
2168operand_is_immed (opnd)
2169 xtensa_operand opnd;
2170{
2171 const char *opkind = xtensa_operand_kind (opnd);
2172 if (opkind[0] == '\0' || opkind[1] != '\0')
2173 return FALSE;
2174 switch (opkind[0])
2175 {
2176 case 'i':
2177 case 'l':
2178 case 'L':
2179 return TRUE;
2180 }
2181 return FALSE;
2182}
2183
2184
2185/* Return true if the given operand is a pc-relative label. This is
2186 true for "l", "L", and "r" operand kinds. */
2187
2188bfd_boolean
2189operand_is_pcrel_label (opnd)
2190 xtensa_operand opnd;
2191{
2192 const char *opkind = xtensa_operand_kind (opnd);
2193 if (opkind[0] == '\0' || opkind[1] != '\0')
2194 return FALSE;
2195 switch (opkind[0])
2196 {
2197 case 'r':
2198 case 'l':
2199 case 'L':
2200 return TRUE;
2201 }
2202 return FALSE;
2203}
2204
2205
2206/* Currently the assembler only allows us to use a single target per
2207 fragment. Because of this, only one operand for a given
2208 instruction may be symbolic. If there is an operand of kind "lrL",
2209 the last one is chosen. Otherwise, the result is the number of the
2210 last operand of type "i", and if there are none of those, we fail
2211 and return -1. */
2212
2213int
2214get_relaxable_immed (opcode)
2215 xtensa_opcode opcode;
2216{
2217 int last_immed = -1;
2218 int noperands, opi;
2219 xtensa_operand operand;
2220
2221 if (opcode == XTENSA_UNDEFINED)
2222 return -1;
2223
2224 noperands = xtensa_num_operands (xtensa_default_isa, opcode);
2225 for (opi = noperands - 1; opi >= 0; opi--)
2226 {
2227 operand = xtensa_get_operand (xtensa_default_isa, opcode, opi);
2228 if (operand_is_pcrel_label (operand))
2229 return opi;
2230 if (last_immed == -1 && operand_is_immed (operand))
2231 last_immed = opi;
2232 }
2233 return last_immed;
2234}
2235
2236
2237xtensa_opcode
2238get_opcode_from_buf (buf)
2239 const char *buf;
2240{
2241 static xtensa_insnbuf insnbuf = NULL;
2242 xtensa_opcode opcode;
2243 xtensa_isa isa = xtensa_default_isa;
2244 if (!insnbuf)
2245 insnbuf = xtensa_insnbuf_alloc (isa);
2246
2247 xtensa_insnbuf_from_chars (isa, insnbuf, buf);
2248 opcode = xtensa_decode_insn (isa, insnbuf);
2249 return opcode;
2250}
2251
2252
2253static bfd_boolean
2254is_direct_call_opcode (opcode)
2255 xtensa_opcode opcode;
2256{
2257 if (opcode == XTENSA_UNDEFINED)
2258 return FALSE;
2259
2260 return (opcode == xtensa_call0_opcode
2261 || opcode == xtensa_call4_opcode
2262 || opcode == xtensa_call8_opcode
2263 || opcode == xtensa_call12_opcode);
2264}
2265
2266
2267static bfd_boolean
2268is_call_opcode (opcode)
2269 xtensa_opcode opcode;
2270{
2271 if (is_direct_call_opcode (opcode))
2272 return TRUE;
2273
2274 if (opcode == XTENSA_UNDEFINED)
2275 return FALSE;
2276
2277 return (opcode == xtensa_callx0_opcode
2278 || opcode == xtensa_callx4_opcode
2279 || opcode == xtensa_callx8_opcode
2280 || opcode == xtensa_callx12_opcode);
2281}
2282
2283
2284/* Return true if the opcode is an entry opcode. This is used because
2285 "entry" adds an implicit ".align 4" and also the entry instruction
2286 has an extra check for an operand value. */
2287
2288static bfd_boolean
2289is_entry_opcode (opcode)
2290 xtensa_opcode opcode;
2291{
2292 if (opcode == XTENSA_UNDEFINED)
2293 return FALSE;
2294
2295 return (opcode == xtensa_entry_opcode);
2296}
2297
2298
2299/* Return true if it is one of the loop opcodes. Loops are special
2300 because they need automatic alignment and they have a relaxation so
2301 complex that we hard-coded it. */
2302
2303static bfd_boolean
2304is_loop_opcode (opcode)
2305 xtensa_opcode opcode;
2306{
2307 if (opcode == XTENSA_UNDEFINED)
2308 return FALSE;
2309
2310 return (opcode == xtensa_loop_opcode
2311 || opcode == xtensa_loopnez_opcode
2312 || opcode == xtensa_loopgtz_opcode);
2313}
2314
2315
2316static bfd_boolean
2317is_the_loop_opcode (opcode)
2318 xtensa_opcode opcode;
2319{
2320 if (opcode == XTENSA_UNDEFINED)
2321 return FALSE;
2322
2323 return (opcode == xtensa_loop_opcode);
2324}
2325
2326
2327static bfd_boolean
2328is_jx_opcode (opcode)
2329 xtensa_opcode opcode;
2330{
2331 if (opcode == XTENSA_UNDEFINED)
2332 return FALSE;
2333
2334 return (opcode == xtensa_jx_opcode);
2335}
2336
2337
2338/* Return true if the opcode is a retw or retw.n.
2339 Needed to add nops to avoid a hardware interlock issue. */
2340
2341static bfd_boolean
2342is_windowed_return_opcode (opcode)
2343 xtensa_opcode opcode;
2344{
2345 if (opcode == XTENSA_UNDEFINED)
2346 return FALSE;
2347
2348 return (opcode == xtensa_retw_opcode || opcode == xtensa_retw_n_opcode);
2349}
2350
2351
2352/* Return true if the opcode type is "l" and the opcode is NOT a jump. */
2353
2354static bfd_boolean
2355is_conditional_branch_opcode (opcode)
2356 xtensa_opcode opcode;
2357{
2358 xtensa_isa isa = xtensa_default_isa;
2359 int num_ops, i;
2360
2361 if (opcode == xtensa_j_opcode && opcode != XTENSA_UNDEFINED)
2362 return FALSE;
2363
2364 num_ops = xtensa_num_operands (isa, opcode);
2365 for (i = 0; i < num_ops; i++)
2366 {
2367 xtensa_operand operand = xtensa_get_operand (isa, opcode, i);
2368 if (strcmp (xtensa_operand_kind (operand), "l") == 0)
2369 return TRUE;
2370 }
2371 return FALSE;
2372}
2373
2374
2375/* Return true if the given opcode is a conditional branch
2376 instruction, i.e., currently this is true if the instruction
2377 is a jx or has an operand with 'l' type and is not a loop. */
2378
2379bfd_boolean
2380is_branch_or_jump_opcode (opcode)
2381 xtensa_opcode opcode;
2382{
2383 int opn, op_count;
2384
2385 if (opcode == XTENSA_UNDEFINED)
2386 return FALSE;
2387
2388 if (is_loop_opcode (opcode))
2389 return FALSE;
2390
2391 if (is_jx_opcode (opcode))
2392 return TRUE;
2393
2394 op_count = xtensa_num_operands (xtensa_default_isa, opcode);
2395 for (opn = 0; opn < op_count; opn++)
2396 {
2397 xtensa_operand opnd =
2398 xtensa_get_operand (xtensa_default_isa, opcode, opn);
2399 const char *opkind = xtensa_operand_kind (opnd);
2400 if (opkind && opkind[0] == 'l' && opkind[1] == '\0')
2401 return TRUE;
2402 }
2403 return FALSE;
2404}
2405
2406
2407/* Convert from operand numbers to BFD relocation type code.
2408 Return BFD_RELOC_NONE on failure. */
2409
2410bfd_reloc_code_real_type
2411opnum_to_reloc (opnum)
2412 int opnum;
2413{
2414 switch (opnum)
2415 {
2416 case 0:
2417 return BFD_RELOC_XTENSA_OP0;
2418 case 1:
2419 return BFD_RELOC_XTENSA_OP1;
2420 case 2:
2421 return BFD_RELOC_XTENSA_OP2;
2422 default:
2423 break;
2424 }
2425 return BFD_RELOC_NONE;
2426}
2427
2428
2429/* Convert from BFD relocation type code to operand number.
2430 Return -1 on failure. */
2431
2432int
2433reloc_to_opnum (reloc)
2434 bfd_reloc_code_real_type reloc;
2435{
2436 switch (reloc)
2437 {
2438 case BFD_RELOC_XTENSA_OP0:
2439 return 0;
2440 case BFD_RELOC_XTENSA_OP1:
2441 return 1;
2442 case BFD_RELOC_XTENSA_OP2:
2443 return 2;
2444 default:
2445 break;
2446 }
2447 return -1;
2448}
2449
2450
2451static void
2452xtensa_insnbuf_set_operand (insnbuf, opcode, operand, value, file, line)
2453 xtensa_insnbuf insnbuf;
2454 xtensa_opcode opcode;
2455 xtensa_operand operand;
2456 int32 value;
2457 const char *file;
2458 unsigned int line;
2459{
2460 xtensa_encode_result encode_result;
2461 uint32 valbuf = value;
2462
2463 encode_result = xtensa_operand_encode (operand, &valbuf);
2464
2465 switch (encode_result)
2466 {
2467 case xtensa_encode_result_ok:
2468 break;
2469 case xtensa_encode_result_align:
2470 as_bad_where ((char *) file, line,
2471 _("operand %d not properly aligned for '%s'"),
2472 value, xtensa_opcode_name (xtensa_default_isa, opcode));
2473 break;
2474 case xtensa_encode_result_not_in_table:
2475 as_bad_where ((char *) file, line,
2476 _("operand %d not in immediate table for '%s'"),
2477 value, xtensa_opcode_name (xtensa_default_isa, opcode));
2478 break;
2479 case xtensa_encode_result_too_high:
2480 as_bad_where ((char *) file, line,
2481 _("operand %d too large for '%s'"), value,
2482 xtensa_opcode_name (xtensa_default_isa, opcode));
2483 break;
2484 case xtensa_encode_result_too_low:
2485 as_bad_where ((char *) file, line,
2486 _("operand %d too small for '%s'"), value,
2487 xtensa_opcode_name (xtensa_default_isa, opcode));
2488 break;
2489 case xtensa_encode_result_not_ok:
2490 as_bad_where ((char *) file, line,
2491 _("operand %d is invalid for '%s'"), value,
2492 xtensa_opcode_name (xtensa_default_isa, opcode));
2493 break;
2494 default:
2495 abort ();
2496 }
2497
2498 xtensa_operand_set_field (operand, insnbuf, valbuf);
2499}
2500
2501
2502static uint32
2503xtensa_insnbuf_get_operand (insnbuf, opcode, opnum)
2504 xtensa_insnbuf insnbuf;
2505 xtensa_opcode opcode;
2506 int opnum;
2507{
2508 xtensa_operand op = xtensa_get_operand (xtensa_default_isa, opcode, opnum);
2509 return xtensa_operand_decode (op, xtensa_operand_get_field (op, insnbuf));
2510}
2511
2512
2513static void
2514xtensa_insnbuf_set_immediate_field (opcode, insnbuf, value, file, line)
2515 xtensa_opcode opcode;
2516 xtensa_insnbuf insnbuf;
2517 int32 value;
2518 const char *file;
2519 unsigned int line;
2520{
2521 xtensa_isa isa = xtensa_default_isa;
2522 int last_opnd = xtensa_num_operands (isa, opcode) - 1;
2523 xtensa_operand operand = xtensa_get_operand (isa, opcode, last_opnd);
2524 xtensa_insnbuf_set_operand (insnbuf, opcode, operand, value, file, line);
2525}
2526
2527
2528static bfd_boolean
2529is_negatable_branch (insn)
2530 TInsn *insn;
2531{
2532 xtensa_isa isa = xtensa_default_isa;
2533 int i;
2534 int num_ops = xtensa_num_operands (isa, insn->opcode);
2535
2536 for (i = 0; i < num_ops; i++)
2537 {
2538 xtensa_operand opnd = xtensa_get_operand (isa, insn->opcode, i);
2539 char *kind = xtensa_operand_kind (opnd);
2540 if (strlen (kind) == 1 && *kind == 'l')
2541 return TRUE;
2542 }
2543 return FALSE;
2544}
2545
2546
2547
2548/* Lists for recording various properties of symbols. */
2549
2550typedef struct symbol_consS_struct
2551{
2552 symbolS *first;
2553 /* These are used for the target taken. */
2554 int is_loop_target:1;
2555 int is_branch_target:1;
2556 int is_literal:1;
2557 int is_moved:1;
2558 struct symbol_consS_struct *rest;
2559} symbol_consS;
2560
2561symbol_consS *defined_symbols = 0;
2562symbol_consS *branch_targets = 0;
2563
2564
2565static void
2566xtensa_define_label (sym)
2567 symbolS *sym;
2568{
2569 symbol_consS *cons = (symbol_consS *) xmalloc (sizeof (symbol_consS));
2570
2571 cons->first = sym;
2572 cons->is_branch_target = 0;
2573 cons->is_loop_target = 0;
2574 cons->is_literal = generating_literals ? 1 : 0;
2575 cons->is_moved = 0;
2576 cons->rest = defined_symbols;
2577 defined_symbols = cons;
2578}
2579
2580
2581void
2582add_target_symbol (sym, is_loop)
2583 symbolS *sym;
2584 bfd_boolean is_loop;
2585{
2586 symbol_consS *cons, *sym_e;
2587
2588 for (sym_e = branch_targets; sym_e; sym_e = sym_e->rest)
2589 {
2590 if (sym_e->first == sym)
2591 {
2592 if (is_loop)
2593 sym_e->is_loop_target = 1;
2594 else
2595 sym_e->is_branch_target = 1;
2596 return;
2597 }
2598 }
2599
2600 cons = (symbol_consS *) xmalloc (sizeof (symbol_consS));
2601 cons->first = sym;
2602 cons->is_branch_target = (is_loop ? 0 : 1);
2603 cons->is_loop_target = (is_loop ? 1 : 0);
2604 cons->rest = branch_targets;
2605 branch_targets = cons;
2606}
2607
2608
2609/* Find the symbol at a given position. (Note: the "loops_ok"
2610 argument is provided to allow ignoring labels that define loop
2611 ends. This fixes a bug where the NOPs to align a loop opcode were
2612 included in a previous zero-cost loop:
2613
2614 loop a0, loopend
2615 <loop1 body>
2616 loopend:
2617
2618 loop a2, loopend2
2619 <loop2 body>
2620
2621 would become:
2622
2623 loop a0, loopend
2624 <loop1 body>
2625 nop.n <===== bad!
2626 loopend:
2627
2628 loop a2, loopend2
2629 <loop2 body>
2630
2631 This argument is used to prevent moving the NOP to before the
2632 loop-end label, which is what you want in this special case.) */
2633
2634static symbolS *
2635xtensa_find_label (fragP, offset, loops_ok)
2636 fragS *fragP;
2637 offsetT offset;
2638 bfd_boolean loops_ok;
2639{
2640 symbol_consS *consP;
2641
2642 for (consP = defined_symbols; consP; consP = consP->rest)
2643 {
2644 symbolS *symP = consP->first;
2645
2646 if (S_GET_SEGMENT (symP) == now_seg
2647 && symbol_get_frag (symP) == fragP
2648 && symbol_constant_p (symP)
2649 && S_GET_VALUE (symP) == fragP->fr_address + (unsigned) offset
2650 && (loops_ok || !is_loop_target_label (symP)))
2651 return symP;
2652 }
2653 return NULL;
2654}
2655
2656
2657static void
2658map_over_defined_symbols (fn)
2659 void (*fn) PARAMS ((symbolS *));
2660{
2661 symbol_consS *sym_cons;
2662
2663 for (sym_cons = defined_symbols; sym_cons; sym_cons = sym_cons->rest)
2664 fn (sym_cons->first);
2665}
2666
2667
2668static bfd_boolean
2669is_loop_target_label (sym)
2670 symbolS *sym;
2671{
2672 symbol_consS *sym_e;
2673
2674 for (sym_e = branch_targets; sym_e; sym_e = sym_e->rest)
2675 {
2676 if (sym_e->first == sym)
2677 return sym_e->is_loop_target;
2678 }
2679 return FALSE;
2680}
2681
2682
2683/* Walk over all of the symbols that are branch target labels and
2684 loop target labels. Mark the associated fragments for these with
2685 the appropriate flags. */
2686
2687static void
2688xtensa_mark_target_fragments ()
2689{
2690 symbol_consS *sym_e;
2691
2692 for (sym_e = branch_targets; sym_e; sym_e = sym_e->rest)
2693 {
2694 symbolS *sym = sym_e->first;
2695
2696 if (symbol_get_frag (sym)
2697 && symbol_constant_p (sym)
2698 && S_GET_VALUE (sym) == 0)
2699 {
2700 if (sym_e->is_branch_target)
2701 symbol_get_frag (sym)->tc_frag_data.is_branch_target = TRUE;
2702 if (sym_e->is_loop_target)
2703 symbol_get_frag (sym)->tc_frag_data.is_loop_target = TRUE;
2704 }
2705 }
2706}
2707
2708
2709
2710/* Various Other Internal Functions. */
2711
2712static bfd_boolean
2713is_unique_insn_expansion (r)
2714 TransitionRule *r;
2715{
2716 if (!r->to_instr || r->to_instr->next != NULL)
2717 return FALSE;
2718 if (r->to_instr->typ != INSTR_INSTR)
2719 return FALSE;
2720 return TRUE;
2721}
2722
2723
2724static int
2725xg_get_insn_size (insn)
2726 TInsn *insn;
2727{
2728 assert (insn->insn_type == ITYPE_INSN);
2729 return xtensa_insn_length (xtensa_default_isa, insn->opcode);
2730}
2731
2732
2733static int
2734xg_get_build_instr_size (insn)
2735 BuildInstr *insn;
2736{
2737 assert (insn->typ == INSTR_INSTR);
2738 return xtensa_insn_length (xtensa_default_isa, insn->opcode);
2739}
2740
2741
2742bfd_boolean
2743xg_is_narrow_insn (insn)
2744 TInsn *insn;
2745{
2746 TransitionTable *table = xg_build_widen_table ();
2747 TransitionList *l;
2748 int num_match = 0;
2749 assert (insn->insn_type == ITYPE_INSN);
2750 assert (insn->opcode < table->num_opcodes);
2751
2752 for (l = table->table[insn->opcode]; l != NULL; l = l->next)
2753 {
2754 TransitionRule *rule = l->rule;
2755
2756 if (xg_instruction_matches_rule (insn, rule)
2757 && is_unique_insn_expansion (rule))
2758 {
2759 /* It only generates one instruction... */
2760 assert (insn->insn_type == ITYPE_INSN);
2761 /* ...and it is a larger instruction. */
2762 if (xg_get_insn_size (insn)
2763 < xg_get_build_instr_size (rule->to_instr))
2764 {
2765 num_match++;
2766 if (num_match > 1)
2767 return FALSE;
2768 }
2769 }
2770 }
2771 return (num_match == 1);
2772}
2773
2774
2775bfd_boolean
2776xg_is_single_relaxable_insn (insn)
2777 TInsn *insn;
2778{
2779 TransitionTable *table = xg_build_widen_table ();
2780 TransitionList *l;
2781 int num_match = 0;
2782 assert (insn->insn_type == ITYPE_INSN);
2783 assert (insn->opcode < table->num_opcodes);
2784
2785 for (l = table->table[insn->opcode]; l != NULL; l = l->next)
2786 {
2787 TransitionRule *rule = l->rule;
2788
2789 if (xg_instruction_matches_rule (insn, rule)
2790 && is_unique_insn_expansion (rule))
2791 {
2792 assert (insn->insn_type == ITYPE_INSN);
2793 /* ... and it is a larger instruction. */
2794 if (xg_get_insn_size (insn)
2795 <= xg_get_build_instr_size (rule->to_instr))
2796 {
2797 num_match++;
2798 if (num_match > 1)
2799 return FALSE;
2800 }
2801 }
2802 }
2803 return (num_match == 1);
2804}
2805
2806
2807/* Return the largest size instruction that this instruction can
2808 expand to. Currently, in all cases, this is 3 bytes. Of course we
2809 could just calculate this once and generate a table. */
2810
2811int
2812xg_get_max_narrow_insn_size (opcode)
2813 xtensa_opcode opcode;
2814{
2815 /* Go ahead and compute it, but it better be 3. */
2816 TransitionTable *table = xg_build_widen_table ();
2817 TransitionList *l;
2818 int old_size = xtensa_insn_length (xtensa_default_isa, opcode);
2819 assert (opcode < table->num_opcodes);
2820
2821 /* Actually we can do better. Check to see of Only one applies. */
2822 for (l = table->table[opcode]; l != NULL; l = l->next)
2823 {
2824 TransitionRule *rule = l->rule;
2825
2826 /* If it only generates one instruction. */
2827 if (is_unique_insn_expansion (rule))
2828 {
2829 int new_size = xtensa_insn_length (xtensa_default_isa,
2830 rule->to_instr->opcode);
2831 if (new_size > old_size)
2832 {
2833 assert (new_size == 3);
2834 return 3;
2835 }
2836 }
2837 }
2838 return old_size;
2839}
2840
2841
2842/* Return the maximum number of bytes this opcode can expand to. */
2843
2844int
2845xg_get_max_insn_widen_size (opcode)
2846 xtensa_opcode opcode;
2847{
2848 TransitionTable *table = xg_build_widen_table ();
2849 TransitionList *l;
2850 int max_size = xtensa_insn_length (xtensa_default_isa, opcode);
2851
2852 assert (opcode < table->num_opcodes);
2853
2854 for (l = table->table[opcode]; l != NULL; l = l->next)
2855 {
2856 TransitionRule *rule = l->rule;
2857 BuildInstr *build_list;
2858 int this_size = 0;
2859
2860 if (!rule)
2861 continue;
2862 build_list = rule->to_instr;
2863 if (is_unique_insn_expansion (rule))
2864 {
2865 assert (build_list->typ == INSTR_INSTR);
2866 this_size = xg_get_max_insn_widen_size (build_list->opcode);
2867 }
2868 else
2869 for (; build_list != NULL; build_list = build_list->next)
2870 {
2871 switch (build_list->typ)
2872 {
2873 case INSTR_INSTR:
2874 this_size += xtensa_insn_length (xtensa_default_isa,
2875 build_list->opcode);
2876
2877 break;
2878 case INSTR_LITERAL_DEF:
2879 case INSTR_LABEL_DEF:
2880 default:
2881 break;
2882 }
2883 }
2884 if (this_size > max_size)
2885 max_size = this_size;
2886 }
2887 return max_size;
2888}
2889
2890
2891/* Return the maximum number of literal bytes this opcode can generate. */
2892
2893int
2894xg_get_max_insn_widen_literal_size (opcode)
2895 xtensa_opcode opcode;
2896{
2897 TransitionTable *table = xg_build_widen_table ();
2898 TransitionList *l;
2899 int max_size = 0;
2900
2901 assert (opcode < table->num_opcodes);
2902
2903 for (l = table->table[opcode]; l != NULL; l = l->next)
2904 {
2905 TransitionRule *rule = l->rule;
2906 BuildInstr *build_list;
2907 int this_size = 0;
2908
2909 if (!rule)
2910 continue;
2911 build_list = rule->to_instr;
2912 if (is_unique_insn_expansion (rule))
2913 {
2914 assert (build_list->typ == INSTR_INSTR);
2915 this_size = xg_get_max_insn_widen_literal_size (build_list->opcode);
2916 }
2917 else
2918 for (; build_list != NULL; build_list = build_list->next)
2919 {
2920 switch (build_list->typ)
2921 {
2922 case INSTR_LITERAL_DEF:
2923 /* hard coded 4-byte literal. */
2924 this_size += 4;
2925 break;
2926 case INSTR_INSTR:
2927 case INSTR_LABEL_DEF:
2928 default:
2929 break;
2930 }
2931 }
2932 if (this_size > max_size)
2933 max_size = this_size;
2934 }
2935 return max_size;
2936}
2937
2938
2939bfd_boolean
2940xg_is_relaxable_insn (insn, lateral_steps)
2941 TInsn *insn;
2942 int lateral_steps;
2943{
2944 int steps_taken = 0;
2945 TransitionTable *table = xg_build_widen_table ();
2946 TransitionList *l;
2947
2948 assert (insn->insn_type == ITYPE_INSN);
2949 assert (insn->opcode < table->num_opcodes);
2950
2951 for (l = table->table[insn->opcode]; l != NULL; l = l->next)
2952 {
2953 TransitionRule *rule = l->rule;
2954
2955 if (xg_instruction_matches_rule (insn, rule))
2956 {
2957 if (steps_taken == lateral_steps)
2958 return TRUE;
2959 steps_taken++;
2960 }
2961 }
2962 return FALSE;
2963}
2964
2965
2966static symbolS *
2967get_special_literal_symbol ()
2968{
2969 static symbolS *sym = NULL;
2970
2971 if (sym == NULL)
2972 sym = symbol_find_or_make ("SPECIAL_LITERAL0\001");
2973 return sym;
2974}
2975
2976
2977static symbolS *
2978get_special_label_symbol ()
2979{
2980 static symbolS *sym = NULL;
2981
2982 if (sym == NULL)
2983 sym = symbol_find_or_make ("SPECIAL_LABEL0\001");
2984 return sym;
2985}
2986
2987
2988/* Return true on success. */
2989
2990bfd_boolean
2991xg_build_to_insn (targ, insn, bi)
2992 TInsn *targ;
2993 TInsn *insn;
2994 BuildInstr *bi;
2995{
2996 BuildOp *op;
2997 symbolS *sym;
2998
2999 memset (targ, 0, sizeof (TInsn));
3000 switch (bi->typ)
3001 {
3002 case INSTR_INSTR:
3003 op = bi->ops;
3004 targ->opcode = bi->opcode;
3005 targ->insn_type = ITYPE_INSN;
3006 targ->is_specific_opcode = FALSE;
3007
3008 for (; op != NULL; op = op->next)
3009 {
3010 int op_num = op->op_num;
3011 int op_data = op->op_data;
3012
3013 assert (op->op_num < MAX_INSN_ARGS);
3014
3015 if (targ->ntok <= op_num)
3016 targ->ntok = op_num + 1;
3017
3018 switch (op->typ)
3019 {
3020 case OP_CONSTANT:
3021 set_expr_const (&targ->tok[op_num], op_data);
3022 break;
3023 case OP_OPERAND:
3024 assert (op_data < insn->ntok);
3025 copy_expr (&targ->tok[op_num], &insn->tok[op_data]);
3026 break;
3027 case OP_LITERAL:
3028 sym = get_special_literal_symbol ();
3029 set_expr_symbol_offset (&targ->tok[op_num], sym, 0);
3030 break;
3031 case OP_LABEL:
3032 sym = get_special_label_symbol ();
3033 set_expr_symbol_offset (&targ->tok[op_num], sym, 0);
3034 break;
3035 default:
3036 /* currently handles:
3037 OP_OPERAND_LOW8
3038 OP_OPERAND_HI24S
3039 OP_OPERAND_F32MINUS */
3040 if (xg_has_userdef_op_fn (op->typ))
3041 {
3042 assert (op_data < insn->ntok);
3043 if (expr_is_const (&insn->tok[op_data]))
3044 {
3045 long val;
3046 copy_expr (&targ->tok[op_num], &insn->tok[op_data]);
3047 val = xg_apply_userdef_op_fn (op->typ,
3048 targ->tok[op_num].
3049 X_add_number);
3050 targ->tok[op_num].X_add_number = val;
3051 }
3052 else
3053 return FALSE; /* We cannot use a relocation for this. */
3054 break;
3055 }
3056 assert (0);
3057 break;
3058 }
3059 }
3060 break;
3061
3062 case INSTR_LITERAL_DEF:
3063 op = bi->ops;
3064 targ->opcode = XTENSA_UNDEFINED;
3065 targ->insn_type = ITYPE_LITERAL;
3066 targ->is_specific_opcode = FALSE;
3067 for (; op != NULL; op = op->next)
3068 {
3069 int op_num = op->op_num;
3070 int op_data = op->op_data;
3071 assert (op->op_num < MAX_INSN_ARGS);
3072
3073 if (targ->ntok <= op_num)
3074 targ->ntok = op_num + 1;
3075
3076 switch (op->typ)
3077 {
3078 case OP_OPERAND:
3079 assert (op_data < insn->ntok);
3080 copy_expr (&targ->tok[op_num], &insn->tok[op_data]);
3081 break;
3082 case OP_LITERAL:
3083 case OP_CONSTANT:
3084 case OP_LABEL:
3085 default:
3086 assert (0);
3087 break;
3088 }
3089 }
3090 break;
3091
3092 case INSTR_LABEL_DEF:
3093 op = bi->ops;
3094 targ->opcode = XTENSA_UNDEFINED;
3095 targ->insn_type = ITYPE_LABEL;
3096 targ->is_specific_opcode = FALSE;
3097 /* Literal with no ops. is a label? */
3098 assert (op == NULL);
3099 break;
3100
3101 default:
3102 assert (0);
3103 }
3104
3105 return TRUE;
3106}
3107
3108
3109/* Return true on success. */
3110
3111bfd_boolean
3112xg_build_to_stack (istack, insn, bi)
3113 IStack *istack;
3114 TInsn *insn;
3115 BuildInstr *bi;
3116{
3117 for (; bi != NULL; bi = bi->next)
3118 {
3119 TInsn *next_insn = istack_push_space (istack);
3120
3121 if (!xg_build_to_insn (next_insn, insn, bi))
3122 return FALSE;
3123 }
3124 return TRUE;
3125}
3126
3127
3128/* Return true on valid expansion. */
3129
3130bfd_boolean
3131xg_expand_to_stack (istack, insn, lateral_steps)
3132 IStack *istack;
3133 TInsn *insn;
3134 int lateral_steps;
3135{
3136 int stack_size = istack->ninsn;
3137 int steps_taken = 0;
3138 TransitionTable *table = xg_build_widen_table ();
3139 TransitionList *l;
3140
3141 assert (insn->insn_type == ITYPE_INSN);
3142 assert (insn->opcode < table->num_opcodes);
3143
3144 for (l = table->table[insn->opcode]; l != NULL; l = l->next)
3145 {
3146 TransitionRule *rule = l->rule;
3147
3148 if (xg_instruction_matches_rule (insn, rule))
3149 {
3150 if (lateral_steps == steps_taken)
3151 {
3152 int i;
3153
3154 /* This is it. Expand the rule to the stack. */
3155 if (!xg_build_to_stack (istack, insn, rule->to_instr))
3156 return FALSE;
3157
3158 /* Check to see if it fits. */
3159 for (i = stack_size; i < istack->ninsn; i++)
3160 {
3161 TInsn *insn = &istack->insn[i];
3162
3163 if (insn->insn_type == ITYPE_INSN
3164 && !tinsn_has_symbolic_operands (insn)
3165 && !xg_immeds_fit (insn))
3166 {
3167 istack->ninsn = stack_size;
3168 return FALSE;
3169 }
3170 }
3171 return TRUE;
3172 }
3173 steps_taken++;
3174 }
3175 }
3176 return FALSE;
3177}
3178
3179
3180bfd_boolean
3181xg_expand_narrow (targ, insn)
3182 TInsn *targ;
3183 TInsn *insn;
3184{
3185 TransitionTable *table = xg_build_widen_table ();
3186 TransitionList *l;
3187
3188 assert (insn->insn_type == ITYPE_INSN);
3189 assert (insn->opcode < table->num_opcodes);
3190
3191 for (l = table->table[insn->opcode]; l != NULL; l = l->next)
3192 {
3193 TransitionRule *rule = l->rule;
3194 if (xg_instruction_matches_rule (insn, rule)
3195 && is_unique_insn_expansion (rule))
3196 {
3197 /* Is it a larger instruction? */
3198 if (xg_get_insn_size (insn)
3199 <= xg_get_build_instr_size (rule->to_instr))
3200 {
3201 xg_build_to_insn (targ, insn, rule->to_instr);
3202 return FALSE;
3203 }
3204 }
3205 }
3206 return TRUE;
3207}
3208
3209
3210/* Assumes: All immeds are constants. Check that all constants fit
3211 into their immeds; return false if not. */
3212
3213static bfd_boolean
3214xg_immeds_fit (insn)
3215 const TInsn *insn;
3216{
3217 int i;
3218
3219 int n = insn->ntok;
3220 assert (insn->insn_type == ITYPE_INSN);
3221 for (i = 0; i < n; ++i)
3222 {
3223 const expressionS *expr = &insn->tok[i];
3224 xtensa_operand opnd = xtensa_get_operand (xtensa_default_isa,
3225 insn->opcode, i);
3226 if (!operand_is_immed (opnd))
3227 continue;
3228
3229 switch (expr->X_op)
3230 {
3231 case O_register:
3232 case O_constant:
3233 {
3234 if (xg_check_operand (expr->X_add_number, opnd))
3235 return FALSE;
3236 }
3237 break;
3238 default:
3239 /* The symbol should have a fixup associated with it. */
3240 assert (FALSE);
3241 break;
3242 }
3243 }
3244 return TRUE;
3245}
3246
3247
3248/* This should only be called after we have an initial
3249 estimate of the addresses. */
3250
3251static bfd_boolean
3252xg_symbolic_immeds_fit (insn, pc_seg, pc_frag, pc_offset, stretch)
3253 const TInsn *insn;
3254 segT pc_seg;
3255 fragS *pc_frag;
3256 offsetT pc_offset;
3257 long stretch;
3258{
3259 symbolS *symbolP;
3260 offsetT target, pc, new_offset;
3261 int i;
3262 int n = insn->ntok;
3263
3264 assert (insn->insn_type == ITYPE_INSN);
3265
3266 for (i = 0; i < n; ++i)
3267 {
3268 const expressionS *expr = &insn->tok[i];
3269 xtensa_operand opnd = xtensa_get_operand (xtensa_default_isa,
3270 insn->opcode, i);
3271 if (!operand_is_immed (opnd))
3272 continue;
3273
3274 switch (expr->X_op)
3275 {
3276 case O_register:
3277 case O_constant:
3278 if (xg_check_operand (expr->X_add_number, opnd))
3279 return FALSE;
3280 break;
3281
3282 case O_symbol:
3283 /* We only allow symbols for pc-relative stuff.
3284 If pc_frag == 0, then we don't have frag locations yet. */
3285 if (pc_frag == 0)
3286 return FALSE;
3287
3288 /* If it is PC-relative and the symbol is in the same segment as
3289 the PC.... */
3290 if (!xtensa_operand_isPCRelative (opnd)
3291 || S_GET_SEGMENT (expr->X_add_symbol) != pc_seg)
3292 return FALSE;
3293
3294 symbolP = expr->X_add_symbol;
3295 target = S_GET_VALUE (symbolP) + expr->X_add_number;
3296 pc = pc_frag->fr_address + pc_offset;
3297
3298 /* If frag has yet to be reached on this pass, assume it
3299 will move by STRETCH just as we did. If this is not so,
3300 it will be because some frag between grows, and that will
3301 force another pass. Beware zero-length frags. There
3302 should be a faster way to do this. */
3303
3304 if (stretch && is_dnrange (pc_frag, symbolP, stretch))
3305 target += stretch;
3306
3307 new_offset = xtensa_operand_do_reloc (opnd, target, pc);
3308 if (xg_check_operand (new_offset, opnd))
3309 return FALSE;
3310 break;
3311
3312 default:
3313 /* The symbol should have a fixup associated with it. */
3314 return FALSE;
3315 }
3316 }
3317
3318 return TRUE;
3319}
3320
3321
3322/* This will check to see if the value can be converted into the
3323 operand type. It will return true if it does not fit. */
3324
3325static bfd_boolean
3326xg_check_operand (value, operand)
3327 int32 value;
3328 xtensa_operand operand;
3329{
3330 uint32 valbuf = value;
3331 return (xtensa_operand_encode (operand, &valbuf) != xtensa_encode_result_ok);
3332}
3333
3334
3335/* Check if a symbol is pointing to somewhere after
3336 the start frag, given that the segment has stretched
3337 by stretch during relaxation.
3338
3339 This is more complicated than it might appear at first blush
3340 because of the stretching that goes on. Here is how the check
3341 works:
3342
3343 If the symbol and the frag are in the same segment, then
3344 the symbol could be down range. Note that this function
3345 assumes that start_frag is in now_seg.
3346
3347 If the symbol is pointing to a frag with an address greater than
3348 than the start_frag's address, then it _could_ be down range.
3349
3350 The problem comes because target_frag may or may not have had
3351 stretch bytes added to its address already, depending on if it is
3352 before or after start frag. (And if we knew that, then we wouldn't
3353 need this function.) start_frag has definitely already had stretch
3354 bytes added to its address.
3355
3356 If target_frag's address hasn't been adjusted yet, then to
3357 determine if it comes after start_frag, we need to subtract
3358 stretch from start_frag's address.
3359
3360 If target_frag's address has been adjusted, then it might have
3361 been adjusted such that it comes after start_frag's address minus
3362 stretch bytes.
3363
3364 So, in that case, we scan for it down stream to within
3365 stretch bytes. We could search to the end of the fr_chain, but
3366 that ends up taking too much time (over a minute on some gnu
3367 tests). */
3368
3369int
3370is_dnrange (start_frag, sym, stretch)
3371 fragS *start_frag;
3372 symbolS *sym;
3373 long stretch;
3374{
3375 if (S_GET_SEGMENT (sym) == now_seg)
3376 {
3377 fragS *cur_frag = symbol_get_frag (sym);
3378
3379 if (cur_frag->fr_address >= start_frag->fr_address - stretch)
3380 {
3381 int distance = stretch;
3382
3383 while (cur_frag && distance >= 0)
3384 {
3385 distance -= cur_frag->fr_fix;
3386 if (cur_frag == start_frag)
3387 return 0;
3388 cur_frag = cur_frag->fr_next;
3389 }
3390 return 1;
3391 }
3392 }
3393 return 0;
3394}
3395
3396
3397
3398/* Relax the assembly instruction at least "min_steps".
3399 Return the number of steps taken. */
3400
3401int
3402xg_assembly_relax (istack, insn, pc_seg, pc_frag, pc_offset, min_steps,
3403 stretch)
3404 IStack *istack;
3405 TInsn *insn;
3406 segT pc_seg;
3407 fragS *pc_frag; /* If pc_frag == 0, then no pc-relative. */
3408 offsetT pc_offset; /* Offset in fragment. */
3409 int min_steps; /* Minimum number of conversion steps. */
3410 long stretch; /* Number of bytes stretched so far. */
3411{
3412 int steps_taken = 0;
3413
3414 /* assert (has no symbolic operands)
3415 Some of its immeds don't fit.
3416 Try to build a relaxed version.
3417 This may go through a couple of stages
3418 of single instruction transformations before
3419 we get there. */
3420
3421 TInsn single_target;
3422 TInsn current_insn;
3423 int lateral_steps = 0;
3424 int istack_size = istack->ninsn;
3425
3426 if (xg_symbolic_immeds_fit (insn, pc_seg, pc_frag, pc_offset, stretch)
3427 && steps_taken >= min_steps)
3428 {
3429 istack_push (istack, insn);
3430 return steps_taken;
3431 }
3432 tinsn_copy (&current_insn, insn);
3433
3434 /* Walk through all of the single instruction expansions. */
3435 while (xg_is_single_relaxable_insn (&current_insn))
3436 {
3437 int error_val = xg_expand_narrow (&single_target, &current_insn);
3438
3439 assert (!error_val);
3440
3441 if (xg_symbolic_immeds_fit (&single_target, pc_seg, pc_frag, pc_offset,
3442 stretch))
3443 {
3444 steps_taken++;
3445 if (steps_taken >= min_steps)
3446 {
3447 istack_push (istack, &single_target);
3448 return steps_taken;
3449 }
3450 }
3451 tinsn_copy (&current_insn, &single_target);
3452 }
3453
3454 /* Now check for a multi-instruction expansion. */
3455 while (xg_is_relaxable_insn (&current_insn, lateral_steps))
3456 {
3457 if (xg_symbolic_immeds_fit (&current_insn, pc_seg, pc_frag, pc_offset,
3458 stretch))
3459 {
3460 if (steps_taken >= min_steps)
3461 {
3462 istack_push (istack, &current_insn);
3463 return steps_taken;
3464 }
3465 }
3466 steps_taken++;
3467 if (xg_expand_to_stack (istack, &current_insn, lateral_steps))
3468 {
3469 if (steps_taken >= min_steps)
3470 return steps_taken;
3471 }
3472 lateral_steps++;
3473 istack->ninsn = istack_size;
3474 }
3475
3476 /* It's not going to work -- use the original. */
3477 istack_push (istack, insn);
3478 return steps_taken;
3479}
3480
3481
3482static void
3483xg_force_frag_space (size)
3484 int size;
3485{
3486 /* This may have the side effect of creating a new fragment for the
3487 space to go into. I just do not like the name of the "frag"
3488 functions. */
3489 frag_grow (size);
3490}
3491
3492
3493void
3494xg_finish_frag (last_insn, state, max_growth, is_insn)
3495 char *last_insn;
3496 enum xtensa_relax_statesE state;
3497 int max_growth;
3498 bfd_boolean is_insn;
3499{
3500 /* Finish off this fragment so that it has at LEAST the desired
3501 max_growth. If it doesn't fit in this fragment, close this one
3502 and start a new one. In either case, return a pointer to the
3503 beginning of the growth area. */
3504
3505 fragS *old_frag;
3506 xg_force_frag_space (max_growth);
3507
3508 old_frag = frag_now;
3509
3510 frag_now->fr_opcode = last_insn;
3511 if (is_insn)
3512 frag_now->tc_frag_data.is_insn = TRUE;
3513
3514 frag_var (rs_machine_dependent, max_growth, max_growth,
3515 state, frag_now->fr_symbol, frag_now->fr_offset, last_insn);
3516
3517 /* Just to make sure that we did not split it up. */
3518 assert (old_frag->fr_next == frag_now);
3519}
3520
3521
3522static bfd_boolean
3523is_branch_jmp_to_next (insn, fragP)
3524 TInsn *insn;
3525 fragS *fragP;
3526{
3527 xtensa_isa isa = xtensa_default_isa;
3528 int i;
3529 int num_ops = xtensa_num_operands (isa, insn->opcode);
3530 int target_op = -1;
3531 symbolS *sym;
3532 fragS *target_frag;
3533
3534 if (is_loop_opcode (insn->opcode))
3535 return FALSE;
3536
3537 for (i = 0; i < num_ops; i++)
3538 {
3539 xtensa_operand opnd = xtensa_get_operand (isa, insn->opcode, i);
3540 char *kind = xtensa_operand_kind (opnd);
3541 if (strlen (kind) == 1 && *kind == 'l')
3542 {
3543 target_op = i;
3544 break;
3545 }
3546 }
3547 if (target_op == -1)
3548 return FALSE;
3549
3550 if (insn->ntok <= target_op)
3551 return FALSE;
3552
3553 if (insn->tok[target_op].X_op != O_symbol)
3554 return FALSE;
3555
3556 sym = insn->tok[target_op].X_add_symbol;
3557 if (sym == NULL)
3558 return FALSE;
3559
3560 if (insn->tok[target_op].X_add_number != 0)
3561 return FALSE;
3562
3563 target_frag = symbol_get_frag (sym);
3564 if (target_frag == NULL)
3565 return FALSE;
3566
3567 if (is_next_frag_target (fragP->fr_next, target_frag)
3568 && S_GET_VALUE (sym) == target_frag->fr_address)
3569 return TRUE;
3570
3571 return FALSE;
3572}
3573
3574
3575static void
3576xg_add_branch_and_loop_targets (insn)
3577 TInsn *insn;
3578{
3579 xtensa_isa isa = xtensa_default_isa;
3580 int num_ops = xtensa_num_operands (isa, insn->opcode);
3581
3582 if (is_loop_opcode (insn->opcode))
3583 {
3584 int i = 1;
3585 xtensa_operand opnd = xtensa_get_operand (isa, insn->opcode, i);
3586 char *kind = xtensa_operand_kind (opnd);
3587 if (strlen (kind) == 1 && *kind == 'l')
3588 if (insn->tok[i].X_op == O_symbol)
3589 add_target_symbol (insn->tok[i].X_add_symbol, TRUE);
3590 return;
3591 }
3592
3593 /* Currently, we do not add branch targets. This is an optimization
3594 for later that tries to align only branch targets, not just any
3595 label in a text section. */
3596
3597 if (align_only_targets)
3598 {
3599 int i;
3600
3601 for (i = 0; i < insn->ntok && i < num_ops; i++)
3602 {
3603 xtensa_operand opnd = xtensa_get_operand (isa, insn->opcode, i);
3604 char *kind = xtensa_operand_kind (opnd);
3605 if (strlen (kind) == 1 && *kind == 'l'
3606 && insn->tok[i].X_op == O_symbol)
3607 add_target_symbol (insn->tok[i].X_add_symbol, FALSE);
3608 }
3609 }
3610}
3611
3612
3613/* Return the transition rule that matches or NULL if none matches. */
3614
3615bfd_boolean
3616xg_instruction_matches_rule (insn, rule)
3617 TInsn *insn;
3618 TransitionRule *rule;
3619{
3620 PreconditionList *condition_l;
3621
3622 if (rule->opcode != insn->opcode)
3623 return FALSE;
3624
3625 for (condition_l = rule->conditions;
3626 condition_l != NULL;
3627 condition_l = condition_l->next)
3628 {
3629 expressionS *exp1;
3630 expressionS *exp2;
3631 Precondition *cond = condition_l->precond;
3632
3633 switch (cond->typ)
3634 {
3635 case OP_CONSTANT:
3636 /* The expression must be the constant. */
3637 assert (cond->op_num < insn->ntok);
3638 exp1 = &insn->tok[cond->op_num];
3639 if (!expr_is_const (exp1))
3640 return FALSE;
3641 switch (cond->cmp)
3642 {
3643 case OP_EQUAL:
3644 if (get_expr_const (exp1) != cond->op_data)
3645 return FALSE;
3646 break;
3647 case OP_NOTEQUAL:
3648 if (get_expr_const (exp1) == cond->op_data)
3649 return FALSE;
3650 break;
3651 }
3652 break;
3653
3654 case OP_OPERAND:
3655 assert (cond->op_num < insn->ntok);
3656 assert (cond->op_data < insn->ntok);
3657 exp1 = &insn->tok[cond->op_num];
3658 exp2 = &insn->tok[cond->op_data];
3659
3660 switch (cond->cmp)
3661 {
3662 case OP_EQUAL:
3663 if (!expr_is_equal (exp1, exp2))
3664 return FALSE;
3665 break;
3666 case OP_NOTEQUAL:
3667 if (expr_is_equal (exp1, exp2))
3668 return FALSE;
3669 break;
3670 }
3671 break;
3672
3673 case OP_LITERAL:
3674 case OP_LABEL:
3675 default:
3676 return FALSE;
3677 }
3678 }
3679 return TRUE;
3680}
3681
3682
3683TransitionRule *
3684xg_instruction_match (insn)
3685 TInsn *insn;
3686{
3687 TransitionTable *table = xg_build_simplify_table ();
3688 TransitionList *l;
3689 assert (insn->opcode < table->num_opcodes);
3690
3691 /* Walk through all of the possible transitions. */
3692 for (l = table->table[insn->opcode]; l != NULL; l = l->next)
3693 {
3694 TransitionRule *rule = l->rule;
3695 if (xg_instruction_matches_rule (insn, rule))
3696 return rule;
3697 }
3698 return NULL;
3699}
3700
3701
3702/* Return false if no error. */
3703
3704bfd_boolean
3705xg_build_token_insn (instr_spec, old_insn, new_insn)
3706 BuildInstr *instr_spec;
3707 TInsn *old_insn;
3708 TInsn *new_insn;
3709{
3710 int num_ops = 0;
3711 BuildOp *b_op;
3712
3713 switch (instr_spec->typ)
3714 {
3715 case INSTR_INSTR:
3716 new_insn->insn_type = ITYPE_INSN;
3717 new_insn->opcode = instr_spec->opcode;
3718 new_insn->is_specific_opcode = FALSE;
3719 break;
3720 case INSTR_LITERAL_DEF:
3721 new_insn->insn_type = ITYPE_LITERAL;
3722 new_insn->opcode = XTENSA_UNDEFINED;
3723 new_insn->is_specific_opcode = FALSE;
3724 break;
3725 case INSTR_LABEL_DEF:
3726 as_bad (_("INSTR_LABEL_DEF not supported yet"));
3727 break;
3728 }
3729
3730 for (b_op = instr_spec->ops; b_op != NULL; b_op = b_op->next)
3731 {
3732 expressionS *exp;
3733 const expressionS *src_exp;
3734
3735 num_ops++;
3736 switch (b_op->typ)
3737 {
3738 case OP_CONSTANT:
3739 /* The expression must be the constant. */
3740 assert (b_op->op_num < MAX_INSN_ARGS);
3741 exp = &new_insn->tok[b_op->op_num];
3742 set_expr_const (exp, b_op->op_data);
3743 break;
3744
3745 case OP_OPERAND:
3746 assert (b_op->op_num < MAX_INSN_ARGS);
3747 assert (b_op->op_data < (unsigned) old_insn->ntok);
3748 src_exp = &old_insn->tok[b_op->op_data];
3749 exp = &new_insn->tok[b_op->op_num];
3750 copy_expr (exp, src_exp);
3751 break;
3752
3753 case OP_LITERAL:
3754 case OP_LABEL:
3755 as_bad (_("can't handle generation of literal/labels yet"));
3756 assert (0);
3757
3758 default:
3759 as_bad (_("can't handle undefined OP TYPE"));
3760 assert (0);
3761 }
3762 }
3763
3764 new_insn->ntok = num_ops;
3765 return FALSE;
3766}
3767
3768
3769/* Return true if it was simplified. */
3770
3771bfd_boolean
3772xg_simplify_insn (old_insn, new_insn)
3773 TInsn *old_insn;
3774 TInsn *new_insn;
3775{
3776 TransitionRule *rule = xg_instruction_match (old_insn);
3777 BuildInstr *insn_spec;
3778 if (rule == NULL)
3779 return FALSE;
3780
3781 insn_spec = rule->to_instr;
3782 /* There should only be one. */
3783 assert (insn_spec != NULL);
3784 assert (insn_spec->next == NULL);
3785 if (insn_spec->next != NULL)
3786 return FALSE;
3787
3788 xg_build_token_insn (insn_spec, old_insn, new_insn);
3789
3790 return TRUE;
3791}
3792
3793
3794/* xg_expand_assembly_insn: (1) Simplify the instruction, i.e., l32i ->
3795 l32i.n. (2) Check the number of operands. (3) Place the instruction
3796 tokens into the stack or if we can relax it at assembly time, place
3797 multiple instructions/literals onto the stack. Return false if no
3798 error. */
3799
3800static bfd_boolean
3801xg_expand_assembly_insn (istack, orig_insn)
3802 IStack *istack;
3803 TInsn *orig_insn;
3804{
3805 int noperands;
3806 TInsn new_insn;
3807 memset (&new_insn, 0, sizeof (TInsn));
3808
3809 /* On return, we will be using the "use_tokens" with "use_ntok".
3810 This will reduce things like addi to addi.n. */
3811 if (code_density_available () && !orig_insn->is_specific_opcode)
3812 {
3813 if (xg_simplify_insn (orig_insn, &new_insn))
3814 orig_insn = &new_insn;
3815 }
3816
3817 noperands = xtensa_num_operands (xtensa_default_isa, orig_insn->opcode);
3818 if (orig_insn->ntok < noperands)
3819 {
3820 as_bad (_("found %d operands for '%s': Expected %d"),
3821 orig_insn->ntok,
3822 xtensa_opcode_name (xtensa_default_isa, orig_insn->opcode),
3823 noperands);
3824 return TRUE;
3825 }
3826 if (orig_insn->ntok > noperands)
3827 as_warn (_("found too many (%d) operands for '%s': Expected %d"),
3828 orig_insn->ntok,
3829 xtensa_opcode_name (xtensa_default_isa, orig_insn->opcode),
3830 noperands);
3831
3832 /* If there are not enough operands, we will assert above. If there
3833 are too many, just cut out the extras here. */
3834
3835 orig_insn->ntok = noperands;
3836
3837 /* Cases:
3838
3839 Instructions with all constant immeds:
3840 Assemble them and relax the instruction if possible.
3841 Give error if not possible; no fixup needed.
3842
3843 Instructions with symbolic immeds:
3844 Assemble them with a Fix up (that may cause instruction expansion).
3845 Also close out the fragment if the fixup may cause instruction expansion.
3846
3847 There are some other special cases where we need alignment.
3848 1) before certain instructions with required alignment (OPCODE_ALIGN)
3849 2) before labels that have jumps (LABEL_ALIGN)
3850 3) after call instructions (RETURN_ALIGN)
3851 Multiple of these may be possible on the same fragment.
3852 If so, make sure to satisfy the required alignment.
3853 Then try to get the desired alignment. */
3854
3855 if (tinsn_has_invalid_symbolic_operands (orig_insn))
3856 return TRUE;
3857
3858 if (orig_insn->is_specific_opcode || !can_relax ())
3859 {
3860 istack_push (istack, orig_insn);
3861 return FALSE;
3862 }
3863
3864 if (tinsn_has_symbolic_operands (orig_insn))
3865 {
3866 if (tinsn_has_complex_operands (orig_insn))
3867 xg_assembly_relax (istack, orig_insn, 0, 0, 0, 0, 0);
3868 else
3869 istack_push (istack, orig_insn);
3870 }
3871 else
3872 {
3873 if (xg_immeds_fit (orig_insn))
3874 istack_push (istack, orig_insn);
3875 else
3876 xg_assembly_relax (istack, orig_insn, 0, 0, 0, 0, 0);
3877 }
3878
3879#if 0
3880 for (i = 0; i < istack->ninsn; i++)
3881 {
3882 if (xg_simplify_insn (&new_insn, &istack->insn[i]))
3883 istack->insn[i] = new_insn;
3884 }
3885#endif
3886
3887 return FALSE;
3888}
3889
3890
3891/* Currently all literals that are generated here are 32-bit L32R targets. */
3892
3893symbolS *
3894xg_assemble_literal (insn)
3895 /* const */ TInsn *insn;
3896{
3897 emit_state state;
3898 symbolS *lit_sym = NULL;
3899
3900 /* size = 4 for L32R. It could easily be larger when we move to
3901 larger constants. Add a parameter later. */
3902 offsetT litsize = 4;
3903 offsetT litalign = 2; /* 2^2 = 4 */
3904 expressionS saved_loc;
3905 set_expr_symbol_offset (&saved_loc, frag_now->fr_symbol, frag_now_fix ());
3906
3907 assert (insn->insn_type == ITYPE_LITERAL);
3908 assert (insn->ntok = 1); /* must be only one token here */
3909
3910 xtensa_switch_to_literal_fragment (&state);
3911
3912 /* Force a 4-byte align here. Note that this opens a new frag, so all
3913 literals done with this function have a frag to themselves. That's
3914 important for the way text section literals work. */
3915 frag_align (litalign, 0, 0);
3916
3917 emit_expr (&insn->tok[0], litsize);
3918
3919 assert (frag_now->tc_frag_data.literal_frag == NULL);
3920 frag_now->tc_frag_data.literal_frag = get_literal_pool_location (now_seg);
3921 frag_now->fr_symbol = xtensa_create_literal_symbol (now_seg, frag_now);
3922 lit_sym = frag_now->fr_symbol;
3923 frag_now->tc_frag_data.is_literal = TRUE;
3924
3925 /* Go back. */
3926 xtensa_restore_emit_state (&state);
3927 return lit_sym;
3928}
3929
3930
3931static void
3932xg_assemble_literal_space (size)
3933 /* const */ int size;
3934{
3935 emit_state state;
3936 /* We might have to do something about this alignment. It only
3937 takes effect if something is placed here. */
3938 offsetT litalign = 2; /* 2^2 = 4 */
3939 fragS *lit_saved_frag;
3940
3941 expressionS saved_loc;
3942
3943 assert (size % 4 == 0);
3944 set_expr_symbol_offset (&saved_loc, frag_now->fr_symbol, frag_now_fix ());
3945
3946 xtensa_switch_to_literal_fragment (&state);
3947
3948 /* Force a 4-byte align here. */
3949 frag_align (litalign, 0, 0);
3950
3951 xg_force_frag_space (size);
3952
3953 lit_saved_frag = frag_now;
3954 frag_now->tc_frag_data.literal_frag = get_literal_pool_location (now_seg);
3955 frag_now->tc_frag_data.is_literal = TRUE;
3956 frag_now->fr_symbol = xtensa_create_literal_symbol (now_seg, frag_now);
3957 xg_finish_frag (0, RELAX_LITERAL, size, FALSE);
3958
3959 /* Go back. */
3960 xtensa_restore_emit_state (&state);
3961 frag_now->tc_frag_data.literal_frag = lit_saved_frag;
3962}
3963
3964
3965symbolS *
3966xtensa_create_literal_symbol (sec, frag)
3967 segT sec;
3968 fragS *frag;
3969{
3970 static int lit_num = 0;
3971 static char name[256];
3972 symbolS *fragSym;
3973
3974 sprintf (name, ".L_lit_sym%d", lit_num);
3975 fragSym = xtensa_create_local_symbol (stdoutput, name, sec, 0, frag_now);
3976
3977 frag->tc_frag_data.is_literal = TRUE;
3978 lit_num++;
3979 return fragSym;
3980}
3981
3982
3983/* Create a local symbol. If it is in a linkonce section, we have to
3984 be careful to make sure that if it is used in a relocation that the
3985 symbol will be in the output file. */
3986
3987symbolS *
3988xtensa_create_local_symbol (abfd, name, sec, value, frag)
3989 bfd *abfd;
3990 const char *name;
3991 segT sec;
3992 valueT value;
3993 fragS *frag;
3994{
3995 symbolS *symbolP;
3996
3997 if (get_is_linkonce_section (abfd, sec))
3998 {
3999 symbolP = symbol_new (name, sec, value, frag);
4000 S_CLEAR_EXTERNAL (symbolP);
4001 /* symbolP->local = 1; */
4002 }
4003 else
4004 symbolP = symbol_new (name, sec, value, frag);
4005
4006 return symbolP;
4007}
4008
4009
4010/* Return true if the section flags are marked linkonce
4011 or the name is .gnu.linkonce*. */
4012
4013bfd_boolean
4014get_is_linkonce_section (abfd, sec)
4015 bfd *abfd ATTRIBUTE_UNUSED;
4016 segT sec;
4017{
4018 flagword flags, link_once_flags;
4019
4020 flags = bfd_get_section_flags (abfd, sec);
4021 link_once_flags = (flags & SEC_LINK_ONCE);
4022
4023 /* Flags might not be set yet. */
4024 if (!link_once_flags)
4025 {
4026 static size_t len = sizeof ".gnu.linkonce.t.";
4027
4028 if (strncmp (segment_name (sec), ".gnu.linkonce.t.", len - 1) == 0)
4029 link_once_flags = SEC_LINK_ONCE;
4030 }
4031 return (link_once_flags != 0);
4032}
4033
4034
4035/* Emit an instruction to the current fragment. If record_fix is true,
4036 then this instruction will not change and we can go ahead and record
4037 the fixup. If record_fix is false, then the instruction may change
4038 and we are going to close out this fragment. Go ahead and set the
4039 fr_symbol and fr_offset instead of adding a fixup. */
4040
4041static bfd_boolean
4042xg_emit_insn (t_insn, record_fix)
4043 TInsn *t_insn;
4044 bfd_boolean record_fix;
4045{
4046 bfd_boolean ok = TRUE;
4047 xtensa_isa isa = xtensa_default_isa;
4048 xtensa_opcode opcode = t_insn->opcode;
4049 bfd_boolean has_fixup = FALSE;
4050 int noperands;
4051 int i, byte_count;
4052 fragS *oldfrag;
4053 size_t old_size;
4054 char *f;
4055 static xtensa_insnbuf insnbuf = NULL;
4056
4057 /* Use a static pointer to the insn buffer so we don't have to call
4058 malloc each time through. */
4059 if (!insnbuf)
4060 insnbuf = xtensa_insnbuf_alloc (xtensa_default_isa);
4061
4062 has_fixup = tinsn_to_insnbuf (t_insn, insnbuf);
4063
4064 noperands = xtensa_num_operands (isa, opcode);
4065 assert (noperands == t_insn->ntok);
4066
4067 byte_count = xtensa_insn_length (isa, opcode);
4068 oldfrag = frag_now;
4069 /* This should NEVER cause us to jump into a new frag;
4070 we've already reserved space. */
4071 old_size = frag_now_fix ();
4072 f = frag_more (byte_count);
4073 assert (oldfrag == frag_now);
4074
4075 /* This needs to generate a record that lists the parts that are
4076 instructions. */
4077 if (!frag_now->tc_frag_data.is_insn)
4078 {
4079 /* If we are at the beginning of a fragment, switch this
4080 fragment to an instruction fragment. */
4081 if (now_seg != absolute_section && old_size != 0)
4082 as_warn (_("instruction fragment may contain data"));
4083 frag_now->tc_frag_data.is_insn = TRUE;
4084 }
4085
4086 xtensa_insnbuf_to_chars (isa, insnbuf, f);
4087
4088 /* dwarf2_emit_insn (byte_count); */
4089
4090 /* Now spit out the opcode fixup.... */
4091 if (!has_fixup)
4092 return !ok;
4093
4094 for (i = 0; i < noperands; ++i)
4095 {
4096 expressionS *expr = &t_insn->tok[i];
4097 switch (expr->X_op)
4098 {
4099 case O_symbol:
4100 if (get_relaxable_immed (opcode) == i)
4101 {
4102 if (record_fix)
4103 {
4104 if (!xg_add_opcode_fix (opcode, i, expr, frag_now,
4105 f - frag_now->fr_literal))
4106 ok = FALSE;
4107 }
4108 else
4109 {
4110 /* Write it to the fr_offset, fr_symbol. */
4111 frag_now->fr_symbol = expr->X_add_symbol;
4112 frag_now->fr_offset = expr->X_add_number;
4113 }
4114 }
4115 else
4116 {
4117 as_bad (_("invalid operand %d on '%s'"),
4118 i, xtensa_opcode_name (isa, opcode));
4119 ok = FALSE;
4120 }
4121 break;
4122
4123 case O_constant:
4124 case O_register:
4125 break;
4126
4127 default:
4128 as_bad (_("invalid expression for operand %d on '%s'"),
4129 i, xtensa_opcode_name (isa, opcode));
4130 ok = FALSE;
4131 break;
4132 }
4133 }
4134
4135 return !ok;
4136}
4137
4138
4139static bfd_boolean
4140xg_emit_insn_to_buf (t_insn, buf, fragP, offset, build_fix)
4141 TInsn *t_insn;
4142 char *buf;
4143 fragS *fragP;
4144 offsetT offset;
4145 bfd_boolean build_fix;
4146{
4147 static xtensa_insnbuf insnbuf = NULL;
4148 bfd_boolean has_symbolic_immed = FALSE;
4149 bfd_boolean ok = TRUE;
4150 if (!insnbuf)
4151 insnbuf = xtensa_insnbuf_alloc (xtensa_default_isa);
4152
4153 has_symbolic_immed = tinsn_to_insnbuf (t_insn, insnbuf);
4154 if (has_symbolic_immed && build_fix)
4155 {
4156 /* Add a fixup. */
4157 int opnum = get_relaxable_immed (t_insn->opcode);
4158 expressionS *exp = &t_insn->tok[opnum];
4159
4160 if (!xg_add_opcode_fix (t_insn->opcode,
4161 opnum, exp, fragP, offset))
4162 ok = FALSE;
4163 }
4164 fragP->tc_frag_data.is_insn = TRUE;
4165 xtensa_insnbuf_to_chars (xtensa_default_isa, insnbuf, buf);
4166 return ok;
4167}
4168
4169
4170/* Put in a fixup record based on the opcode.
4171 Return true on success. */
4172
4173bfd_boolean
4174xg_add_opcode_fix (opcode, opnum, expr, fragP, offset)
4175 xtensa_opcode opcode;
4176 int opnum;
4177 expressionS *expr;
4178 fragS *fragP;
4179 offsetT offset;
4180{
4181 bfd_reloc_code_real_type reloc;
4182 reloc_howto_type *howto;
4183 int insn_length;
4184 fixS *the_fix;
4185
4186 reloc = opnum_to_reloc (opnum);
4187 if (reloc == BFD_RELOC_NONE)
4188 {
4189 as_bad (_("invalid relocation operand %i on '%s'"),
4190 opnum, xtensa_opcode_name (xtensa_default_isa, opcode));
4191 return FALSE;
4192 }
4193
4194 howto = bfd_reloc_type_lookup (stdoutput, reloc);
4195
4196 if (!howto)
4197 {
4198 as_bad (_("undefined symbol for opcode \"%s\"."),
4199 xtensa_opcode_name (xtensa_default_isa, opcode));
4200 return FALSE;
4201 }
4202
4203 insn_length = xtensa_insn_length (xtensa_default_isa, opcode);
4204 the_fix = fix_new_exp (fragP, offset, insn_length, expr,
4205 howto->pc_relative, reloc);
4206
4207 if (expr->X_add_symbol &&
4208 (S_IS_EXTERNAL (expr->X_add_symbol) || S_IS_WEAK (expr->X_add_symbol)))
4209 the_fix->fx_plt = TRUE;
4210
4211 return TRUE;
4212}
4213
4214
4215void
4216xg_resolve_literals (insn, lit_sym)
4217 TInsn *insn;
4218 symbolS *lit_sym;
4219{
4220 symbolS *sym = get_special_literal_symbol ();
4221 int i;
4222 if (lit_sym == 0)
4223 return;
4224 assert (insn->insn_type == ITYPE_INSN);
4225 for (i = 0; i < insn->ntok; i++)
4226 if (insn->tok[i].X_add_symbol == sym)
4227 insn->tok[i].X_add_symbol = lit_sym;
4228
4229}
4230
4231
4232void
4233xg_resolve_labels (insn, label_sym)
4234 TInsn *insn;
4235 symbolS *label_sym;
4236{
4237 symbolS *sym = get_special_label_symbol ();
4238 int i;
4239 /* assert(!insn->is_literal); */
4240 for (i = 0; i < insn->ntok; i++)
4241 if (insn->tok[i].X_add_symbol == sym)
4242 insn->tok[i].X_add_symbol = label_sym;
4243
4244}
4245
4246
4247static void
4248xg_assemble_tokens (insn)
4249 /*const */ TInsn *insn;
4250{
4251 /* By the time we get here, there's not too much left to do.
4252 1) Check our assumptions.
4253 2) Check if the current instruction is "narrow".
4254 If so, then finish the frag, create another one.
4255 We could also go back to change some previous
4256 "narrow" frags into no-change ones if we have more than
4257 MAX_NARROW_ALIGNMENT of them without alignment restrictions
4258 between them.
4259
4260 Cases:
4261 1) It has constant operands and doesn't fit.
4262 Go ahead and assemble it so it will fail.
4263 2) It has constant operands that fit.
4264 If narrow and !is_specific_opcode,
4265 assemble it and put in a relocation
4266 else
4267 assemble it.
4268 3) It has a symbolic immediate operand
4269 a) Find the worst-case relaxation required
4270 b) Find the worst-case literal pool space required.
4271 Insert appropriate alignment & space in the literal.
4272 Assemble it.
4273 Add the relocation. */
4274
4275 assert (insn->insn_type == ITYPE_INSN);
4276
4277 if (!tinsn_has_symbolic_operands (insn))
4278 {
4279 if (xg_is_narrow_insn (insn) && !insn->is_specific_opcode)
4280 {
4281 /* assemble it but add max required space */
4282 int max_size = xg_get_max_narrow_insn_size (insn->opcode);
4283 int min_size = xg_get_insn_size (insn);
4284 char *last_insn;
4285 assert (max_size == 3);
4286 /* make sure we have enough space to widen it */
4287 xg_force_frag_space (max_size);
4288 /* Output the instruction. It may cause an error if some
4289 operands do not fit. */
4290 last_insn = frag_more (0);
4291 if (xg_emit_insn (insn, TRUE))
4292 as_warn (_("instruction with constant operands does not fit"));
4293 xg_finish_frag (last_insn, RELAX_NARROW, max_size - min_size, TRUE);
4294 }
4295 else
4296 {
4297 /* Assemble it. No relocation needed. */
4298 int max_size = xg_get_insn_size (insn);
4299 xg_force_frag_space (max_size);
4300 if (xg_emit_insn (insn, FALSE))
4301 as_warn (_("instruction with constant operands does not "
4302 "fit without widening"));
4303 /* frag_more (max_size); */
4304
4305 /* Special case for jx. If the jx is the next to last
4306 instruction in a loop, we will add a NOP after it. This
4307 avoids a hardware issue that could occur if the jx jumped
4308 to the next instruction. */
4309 if (software_avoid_b_j_loop_end
4310 && is_jx_opcode (insn->opcode))
4311 {
4312 maybe_has_b_j_loop_end = TRUE;
4313 /* add 2 of these */
4314 frag_now->tc_frag_data.is_insn = TRUE;
4315 frag_var (rs_machine_dependent, 4, 4,
4316 RELAX_ADD_NOP_IF_PRE_LOOP_END,
4317 frag_now->fr_symbol, frag_now->fr_offset, NULL);
4318 }
4319 }
4320 }
4321 else
4322 {
4323 /* Need to assemble it with space for the relocation. */
4324 if (!insn->is_specific_opcode)
4325 {
4326 /* Assemble it but add max required space. */
4327 char *last_insn;
4328 int min_size = xg_get_insn_size (insn);
4329 int max_size = xg_get_max_insn_widen_size (insn->opcode);
4330 int max_literal_size =
4331 xg_get_max_insn_widen_literal_size (insn->opcode);
4332
4333#if 0
4334 symbolS *immed_sym = xg_get_insn_immed_symbol (insn);
4335 set_frag_segment (frag_now, now_seg);
4336#endif /* 0 */
4337
4338 /* Make sure we have enough space to widen the instruction.
4339 This may open a new fragment. */
4340 xg_force_frag_space (max_size);
4341 if (max_literal_size != 0)
4342 xg_assemble_literal_space (max_literal_size);
4343
4344 /* Output the instruction. It may cause an error if some
4345 operands do not fit. Emit the incomplete instruction. */
4346 last_insn = frag_more (0);
4347 xg_emit_insn (insn, FALSE);
4348
4349 xg_finish_frag (last_insn, RELAX_IMMED, max_size - min_size, TRUE);
4350
4351 /* Special cases for loops:
4352 close_loop_end should be inserted AFTER short_loop.
4353 Make sure that CLOSE loops are processed BEFORE short_loops
4354 when converting them. */
4355
4356 /* "short_loop": add a NOP if the loop is < 4 bytes. */
4357 if (software_avoid_short_loop
4358 && is_loop_opcode (insn->opcode))
4359 {
4360 maybe_has_short_loop = TRUE;
4361 frag_now->tc_frag_data.is_insn = TRUE;
4362 frag_var (rs_machine_dependent, 4, 4,
4363 RELAX_ADD_NOP_IF_SHORT_LOOP,
4364 frag_now->fr_symbol, frag_now->fr_offset, NULL);
4365 frag_now->tc_frag_data.is_insn = TRUE;
4366 frag_var (rs_machine_dependent, 4, 4,
4367 RELAX_ADD_NOP_IF_SHORT_LOOP,
4368 frag_now->fr_symbol, frag_now->fr_offset, NULL);
4369 }
4370
4371 /* "close_loop_end": Add up to 12 bytes of NOPs to keep a
4372 loop at least 12 bytes away from another loop's loop
4373 end. */
4374 if (software_avoid_close_loop_end
4375 && is_loop_opcode (insn->opcode))
4376 {
4377 maybe_has_close_loop_end = TRUE;
4378 frag_now->tc_frag_data.is_insn = TRUE;
4379 frag_var (rs_machine_dependent, 12, 12,
4380 RELAX_ADD_NOP_IF_CLOSE_LOOP_END,
4381 frag_now->fr_symbol, frag_now->fr_offset, NULL);
4382 }
4383 }
4384 else
4385 {
4386 /* Assemble it in place. No expansion will be required,
4387 but we'll still need a relocation record. */
4388 int max_size = xg_get_insn_size (insn);
4389 xg_force_frag_space (max_size);
4390 if (xg_emit_insn (insn, TRUE))
4391 as_warn (_("instruction's constant operands do not fit"));
4392 }
4393 }
4394}
4395
4396
4397/* Return true if the instruction can write to the specified
4398 integer register. */
4399
4400static bfd_boolean
4401is_register_writer (insn, regset, regnum)
4402 const TInsn *insn;
4403 const char *regset;
4404 int regnum;
4405{
4406 int i;
4407 int num_ops;
4408 xtensa_isa isa = xtensa_default_isa;
4409
4410 num_ops = xtensa_num_operands (isa, insn->opcode);
4411
4412 for (i = 0; i < num_ops; i++)
4413 {
4414 xtensa_operand operand = xtensa_get_operand (isa, insn->opcode, i);
4415 char inout = xtensa_operand_inout (operand);
4416
4417 if (inout == '>' || inout == '=')
4418 {
4419 if (strcmp (xtensa_operand_kind (operand), regset) == 0)
4420 {
4421 if ((insn->tok[i].X_op == O_register)
4422 && (insn->tok[i].X_add_number == regnum))
4423 return TRUE;
4424 }
4425 }
4426 }
4427 return FALSE;
4428}
4429
4430
4431static bfd_boolean
4432is_bad_loopend_opcode (tinsn)
4433 const TInsn * tinsn;
4434{
4435 xtensa_opcode opcode = tinsn->opcode;
4436
4437 if (opcode == XTENSA_UNDEFINED)
4438 return FALSE;
4439
4440 if (opcode == xtensa_call0_opcode
4441 || opcode == xtensa_callx0_opcode
4442 || opcode == xtensa_call4_opcode
4443 || opcode == xtensa_callx4_opcode
4444 || opcode == xtensa_call8_opcode
4445 || opcode == xtensa_callx8_opcode
4446 || opcode == xtensa_call12_opcode
4447 || opcode == xtensa_callx12_opcode
4448 || opcode == xtensa_isync_opcode
4449 || opcode == xtensa_ret_opcode
4450 || opcode == xtensa_ret_n_opcode
4451 || opcode == xtensa_retw_opcode
4452 || opcode == xtensa_retw_n_opcode
4453 || opcode == xtensa_waiti_opcode)
4454 return TRUE;
4455
4456 /* An RSR of LCOUNT is illegal as the last opcode in a loop. */
4457 if (opcode == xtensa_rsr_opcode
4458 && tinsn->ntok >= 2
4459 && tinsn->tok[1].X_op == O_constant
4460 && tinsn->tok[1].X_add_number == 2)
4461 return TRUE;
4462
4463 return FALSE;
4464}
4465
4466
4467/* Labels that begin with ".Ln" or ".LM" are unaligned.
4468 This allows the debugger to add unaligned labels.
4469 Also, the assembler generates stabs labels that need
4470 not be aligned: FAKE_LABEL_NAME . {"F", "L", "endfunc"}. */
4471
4472bfd_boolean
4473is_unaligned_label (sym)
4474 symbolS *sym;
4475{
4476 const char *name = S_GET_NAME (sym);
4477 static size_t fake_size = 0;
4478
4479 if (name
4480 && name[0] == '.'
4481 && name[1] == 'L' && (name[2] == 'n' || name[2] == 'M'))
4482 return TRUE;
4483
4484 /* FAKE_LABEL_NAME followed by "F", "L" or "endfunc" */
4485 if (fake_size == 0)
4486 fake_size = strlen (FAKE_LABEL_NAME);
4487
4488 if (name
4489 && strncmp (FAKE_LABEL_NAME, name, fake_size) == 0
4490 && (name[fake_size] == 'F'
4491 || name[fake_size] == 'L'
4492 || (name[fake_size] == 'e'
4493 && strncmp ("endfunc", name+fake_size, 7) == 0)))
4494 return TRUE;
4495
4496 return FALSE;
4497}
4498
4499
4500fragS *
4501next_non_empty_frag (fragP)
4502 const fragS *fragP;
4503{
4504 fragS *next_fragP = fragP->fr_next;
4505
4506 /* Sometimes an empty will end up here due storage allocation issues.
4507 So we have to skip until we find something legit. */
4508 while (next_fragP && next_fragP->fr_fix == 0)
4509 next_fragP = next_fragP->fr_next;
4510
4511 if (next_fragP == NULL || next_fragP->fr_fix == 0)
4512 return NULL;
4513
4514 return next_fragP;
4515}
4516
4517
4518xtensa_opcode
4519next_frag_opcode (fragP)
4520 const fragS * fragP;
4521{
4522 const fragS *next_fragP = next_non_empty_frag (fragP);
4523 static xtensa_insnbuf insnbuf = NULL;
4524 xtensa_isa isa = xtensa_default_isa;
4525
4526 if (!insnbuf)
4527 insnbuf = xtensa_insnbuf_alloc (isa);
4528
4529 if (next_fragP == NULL)
4530 return XTENSA_UNDEFINED;
4531
4532 xtensa_insnbuf_from_chars (isa, insnbuf, next_fragP->fr_literal);
4533 return xtensa_decode_insn (isa, insnbuf);
4534}
4535
4536
4537/* Return true if the target frag is one of the next non-empty frags. */
4538
4539bfd_boolean
4540is_next_frag_target (fragP, target)
4541 const fragS *fragP;
4542 const fragS *target;
4543{
4544 if (fragP == NULL)
4545 return FALSE;
4546
4547 for (; fragP; fragP = fragP->fr_next)
4548 {
4549 if (fragP == target)
4550 return TRUE;
4551 if (fragP->fr_fix != 0)
4552 return FALSE;
4553 if (fragP->fr_type == rs_fill && fragP->fr_offset != 0)
4554 return FALSE;
4555 if ((fragP->fr_type == rs_align || fragP->fr_type == rs_align_code)
4556 && ((fragP->fr_address % (1 << fragP->fr_offset)) != 0))
4557 return FALSE;
4558 if (fragP->fr_type == rs_space)
4559 return FALSE;
4560 }
4561 return FALSE;
4562}
4563
4564
4565/* If the next legit fragment is an end-of-loop marker,
4566 switch its state so it will instantiate a NOP. */
4567
4568static void
4569update_next_frag_nop_state (fragP)
4570 fragS *fragP;
4571{
4572 fragS *next_fragP = fragP->fr_next;
4573
4574 while (next_fragP && next_fragP->fr_fix == 0)
4575 {
4576 if (next_fragP->fr_type == rs_machine_dependent
4577 && next_fragP->fr_subtype == RELAX_LOOP_END)
4578 {
4579 next_fragP->fr_subtype = RELAX_LOOP_END_ADD_NOP;
4580 return;
4581 }
4582 next_fragP = next_fragP->fr_next;
4583 }
4584}
4585
4586
4587static bfd_boolean
4588next_frag_is_branch_target (fragP)
4589 const fragS *fragP;
4590{
4591 /* Sometimes an empty will end up here due storage allocation issues,
4592 so we have to skip until we find something legit. */
4593 for (fragP = fragP->fr_next; fragP; fragP = fragP->fr_next)
4594 {
4595 if (fragP->tc_frag_data.is_branch_target)
4596 return TRUE;
4597 if (fragP->fr_fix != 0)
4598 break;
4599 }
4600 return FALSE;
4601}
4602
4603
4604static bfd_boolean
4605next_frag_is_loop_target (fragP)
4606 const fragS *fragP;
4607{
4608 /* Sometimes an empty will end up here due storage allocation issues.
4609 So we have to skip until we find something legit. */
4610 for (fragP = fragP->fr_next; fragP; fragP = fragP->fr_next)
4611 {
4612 if (fragP->tc_frag_data.is_loop_target)
4613 return TRUE;
4614 if (fragP->fr_fix != 0)
4615 break;
4616 }
4617 return FALSE;
4618}
4619
4620
4621static addressT
4622next_frag_pre_opcode_bytes (fragp)
4623 const fragS *fragp;
4624{
4625 const fragS *next_fragp = fragp->fr_next;
4626
4627 xtensa_opcode next_opcode = next_frag_opcode (fragp);
4628 if (!is_loop_opcode (next_opcode))
4629 return 0;
4630
4631 /* Sometimes an empty will end up here due storage allocation issues.
4632 So we have to skip until we find something legit. */
4633 while (next_fragp->fr_fix == 0)
4634 next_fragp = next_fragp->fr_next;
4635
4636 if (next_fragp->fr_type != rs_machine_dependent)
4637 return 0;
4638
4639 /* There is some implicit knowledge encoded in here.
4640 The LOOP instructions that are NOT RELAX_IMMED have
4641 been relaxed. */
4642 if (next_fragp->fr_subtype > RELAX_IMMED)
4643 return get_expanded_loop_offset (next_opcode);
4644
4645 return 0;
4646}
4647
4648
4649/* Mark a location where we can later insert literal frags. Update
4650 the section's literal_pool_loc, so subsequent literals can be
4651 placed nearest to their use. */
4652
4653static void
4654xtensa_mark_literal_pool_location (move_labels)
4655 bfd_boolean move_labels;
4656{
4657 /* Any labels pointing to the current location need
4658 to be adjusted to after the literal pool. */
4659 emit_state s;
4660 fragS *label_target = frag_now;
4661 fragS *pool_location;
4662 offsetT label_offset = frag_now_fix ();
4663
4664 frag_align (2, 0, 0);
4665
4666 /* We stash info in the fr_var of these frags
4667 so we can later move the literal's fixes into this
4668 frchain's fix list. We can use fr_var because fr_var's
4669 interpretation depends solely on the fr_type and subtype. */
4670 pool_location = frag_now;
4671 frag_variant (rs_machine_dependent, 0, (int) frchain_now,
4672 RELAX_LITERAL_POOL_BEGIN, NULL, 0, NULL);
4673 frag_variant (rs_machine_dependent, 0, (int) now_seg,
4674 RELAX_LITERAL_POOL_END, NULL, 0, NULL);
4675
4676 /* Now put a frag into the literal pool that points to this location. */
4677 set_literal_pool_location (now_seg, pool_location);
4678 xtensa_switch_to_literal_fragment (&s);
4679
4680 /* Close whatever frag is there. */
4681 frag_variant (rs_fill, 0, 0, 0, NULL, 0, NULL);
4682 frag_now->tc_frag_data.literal_frag = pool_location;
4683 frag_variant (rs_fill, 0, 0, 0, NULL, 0, NULL);
4684 xtensa_restore_emit_state (&s);
4685 if (move_labels)
4686 xtensa_move_labels (label_target, label_offset, frag_now, 0);
4687}
4688
4689
4690static void
4691xtensa_move_labels (old_frag, old_offset, new_frag, new_offset)
4692 fragS *old_frag;
4693 valueT old_offset;
4694 fragS *new_frag ATTRIBUTE_UNUSED;
4695 valueT new_offset;
4696{
4697 symbolS *old_sym;
4698
4699 /* Repeat until there are no more.... */
4700 for (old_sym = xtensa_find_label (old_frag, old_offset, TRUE);
4701 old_sym;
4702 old_sym = xtensa_find_label (old_frag, old_offset, TRUE))
4703 {
4704 S_SET_VALUE (old_sym, (valueT) new_offset);
4705 symbol_set_frag (old_sym, frag_now);
4706 }
4707}
4708
4709
4710/* Assemble a NOP of the requested size in the buffer. User must have
4711 allocated "buf" with at least "size" bytes. */
4712
4713void
4714assemble_nop (size, buf)
4715 size_t size;
4716 char *buf;
4717{
4718 static xtensa_insnbuf insnbuf = NULL;
4719 TInsn t_insn;
4720 if (!insnbuf)
4721 insnbuf = xtensa_insnbuf_alloc (xtensa_default_isa);
4722
4723 tinsn_init (&t_insn);
4724 switch (size)
4725 {
4726 case 2:
4727 t_insn.opcode = xtensa_nop_n_opcode;
4728 t_insn.ntok = 0;
4729 if (t_insn.opcode == XTENSA_UNDEFINED)
4730 as_fatal (_("opcode 'NOP.N' unavailable in this configuration"));
4731 tinsn_to_insnbuf (&t_insn, insnbuf);
4732 xtensa_insnbuf_to_chars (xtensa_default_isa, insnbuf, buf);
4733 break;
4734
4735 case 3:
4736 t_insn.opcode = xtensa_or_opcode;
4737 assert (t_insn.opcode != XTENSA_UNDEFINED);
4738 if (t_insn.opcode == XTENSA_UNDEFINED)
4739 as_fatal (_("opcode 'OR' unavailable in this configuration"));
4740 set_expr_const (&t_insn.tok[0], 1);
4741 set_expr_const (&t_insn.tok[1], 1);
4742 set_expr_const (&t_insn.tok[2], 1);
4743 t_insn.ntok = 3;
4744 tinsn_to_insnbuf (&t_insn, insnbuf);
4745 xtensa_insnbuf_to_chars (xtensa_default_isa, insnbuf, buf);
4746 break;
4747
4748 default:
4749 as_fatal (_("invalid %d-byte NOP requested"), size);
4750 }
4751}
4752
4753
4754/* Return the number of bytes for the offset of the expanded loop
4755 instruction. This should be incorporated into the relaxation
4756 specification but is hard-coded here. This is used to auto-align
4757 the loop instruction. It is invalid to call this function if the
4758 configuration does not have loops or if the opcode is not a loop
4759 opcode. */
4760
4761static addressT
4762get_expanded_loop_offset (opcode)
4763 xtensa_opcode opcode;
4764{
4765 /* This is the OFFSET of the loop instruction in the expanded loop.
4766 This MUST correspond directly to the specification of the loop
4767 expansion. It will be validated on fragment conversion. */
4768 if (opcode == XTENSA_UNDEFINED)
4769 as_fatal (_("get_expanded_loop_offset: undefined opcode"));
4770 if (opcode == xtensa_loop_opcode)
4771 return 0;
4772 if (opcode == xtensa_loopnez_opcode)
4773 return 3;
4774 if (opcode == xtensa_loopgtz_opcode)
4775 return 6;
4776 as_fatal (_("get_expanded_loop_offset: invalid opcode"));
4777 return 0;
4778}
4779
4780
4781fragS *
4782get_literal_pool_location (seg)
4783 segT seg;
4784{
4785 return seg_info (seg)->tc_segment_info_data.literal_pool_loc;
4786}
4787
4788
4789static void
4790set_literal_pool_location (seg, literal_pool_loc)
4791 segT seg;
4792 fragS *literal_pool_loc;
4793{
4794 seg_info (seg)->tc_segment_info_data.literal_pool_loc = literal_pool_loc;
4795}
4796
4797
4798
4799/* External Functions and Other GAS Hooks. */
4800
4801const char *
4802xtensa_target_format ()
4803{
4804 return (target_big_endian ? "elf32-xtensa-be" : "elf32-xtensa-le");
4805}
4806
4807
4808void
4809xtensa_file_arch_init (abfd)
4810 bfd *abfd;
4811{
4812 bfd_set_private_flags (abfd, 0x100 | 0x200);
4813}
4814
4815
4816void
4817md_number_to_chars (buf, val, n)
4818 char *buf;
4819 valueT val;
4820 int n;
4821{
4822 if (target_big_endian)
4823 number_to_chars_bigendian (buf, val, n);
4824 else
4825 number_to_chars_littleendian (buf, val, n);
4826}
4827
4828
4829/* This function is called once, at assembler startup time. It should
4830 set up all the tables, etc. that the MD part of the assembler will
4831 need. */
4832
4833void
4834md_begin ()
4835{
4836 segT current_section = now_seg;
4837 int current_subsec = now_subseg;
4838 xtensa_isa isa;
4839
4840#if STATIC_LIBISA
4841 isa = xtensa_isa_init ();
4842#else
4843 /* ISA was already initialized by xtensa_init(). */
4844 isa = xtensa_default_isa;
4845#endif
4846
4847 /* Set up the .literal, .fini.literal and .init.literal sections. */
4848 memset (&default_lit_sections, 0, sizeof (default_lit_sections));
4849 default_lit_sections.init_lit_seg_name = INIT_LITERAL_SECTION_NAME;
4850 default_lit_sections.fini_lit_seg_name = FINI_LITERAL_SECTION_NAME;
4851 default_lit_sections.lit_seg_name = LITERAL_SECTION_NAME;
4852
4853 subseg_set (current_section, current_subsec);
4854
4855 xtensa_addi_opcode = xtensa_opcode_lookup (isa, "addi");
4856 xtensa_addmi_opcode = xtensa_opcode_lookup (isa, "addmi");
4857 xtensa_call0_opcode = xtensa_opcode_lookup (isa, "call0");
4858 xtensa_call4_opcode = xtensa_opcode_lookup (isa, "call4");
4859 xtensa_call8_opcode = xtensa_opcode_lookup (isa, "call8");
4860 xtensa_call12_opcode = xtensa_opcode_lookup (isa, "call12");
4861 xtensa_callx0_opcode = xtensa_opcode_lookup (isa, "callx0");
4862 xtensa_callx4_opcode = xtensa_opcode_lookup (isa, "callx4");
4863 xtensa_callx8_opcode = xtensa_opcode_lookup (isa, "callx8");
4864 xtensa_callx12_opcode = xtensa_opcode_lookup (isa, "callx12");
4865 xtensa_entry_opcode = xtensa_opcode_lookup (isa, "entry");
4866 xtensa_isync_opcode = xtensa_opcode_lookup (isa, "isync");
4867 xtensa_j_opcode = xtensa_opcode_lookup (isa, "j");
4868 xtensa_jx_opcode = xtensa_opcode_lookup (isa, "jx");
4869 xtensa_loop_opcode = xtensa_opcode_lookup (isa, "loop");
4870 xtensa_loopnez_opcode = xtensa_opcode_lookup (isa, "loopnez");
4871 xtensa_loopgtz_opcode = xtensa_opcode_lookup (isa, "loopgtz");
4872 xtensa_nop_n_opcode = xtensa_opcode_lookup (isa, "nop.n");
4873 xtensa_or_opcode = xtensa_opcode_lookup (isa, "or");
4874 xtensa_ret_opcode = xtensa_opcode_lookup (isa, "ret");
4875 xtensa_ret_n_opcode = xtensa_opcode_lookup (isa, "ret.n");
4876 xtensa_retw_opcode = xtensa_opcode_lookup (isa, "retw");
4877 xtensa_retw_n_opcode = xtensa_opcode_lookup (isa, "retw.n");
4878 xtensa_rsr_opcode = xtensa_opcode_lookup (isa, "rsr");
4879 xtensa_waiti_opcode = xtensa_opcode_lookup (isa, "waiti");
4880}
4881
4882
4883/* tc_frob_label hook */
4884
4885void
4886xtensa_frob_label (sym)
4887 symbolS *sym;
4888{
4889 xtensa_define_label (sym);
4890 if (is_loop_target_label (sym)
4891 && (get_last_insn_flags (now_seg, now_subseg)
4892 & FLAG_IS_BAD_LOOPEND) != 0)
4893 as_bad (_("invalid last instruction for a zero-overhead loop"));
4894
4895 /* No target aligning in the absolute section. */
4896 if (now_seg != absolute_section && align_targets
4897 && !is_unaligned_label (sym))
4898 {
4899 fragS *old_frag = frag_now;
4900 offsetT old_offset = frag_now_fix ();
4901 if (frag_now->tc_frag_data.is_literal)
4902 return;
4903 /* frag_now->tc_frag_data.is_insn = TRUE; */
4904 frag_var (rs_machine_dependent, 4, 4,
4905 RELAX_DESIRE_ALIGN_IF_TARGET,
4906 frag_now->fr_symbol, frag_now->fr_offset, NULL);
4907 xtensa_move_labels (old_frag, old_offset, frag_now, 0);
4908 /* Once we know whether or not the label is a branch target
4909 We will suppress some of these alignments. */
4910 }
4911}
4912
4913
4914/* md_flush_pending_output hook */
4915
4916void
4917xtensa_flush_pending_output ()
4918{
4919 /* If there is a non-zero instruction fragment, close it. */
4920 if (frag_now_fix () != 0 && frag_now->tc_frag_data.is_insn)
4921 {
4922 frag_wane (frag_now);
4923 frag_new (0);
4924 }
4925 frag_now->tc_frag_data.is_insn = FALSE;
4926}
4927
4928
4929void
4930md_assemble (str)
4931 char *str;
4932{
4933 xtensa_isa isa = xtensa_default_isa;
4934 char *opname;
4935 unsigned opnamelen;
4936 bfd_boolean has_underbar = FALSE;
4937 char *arg_strings[MAX_INSN_ARGS];
4938 int num_args;
4939 IStack istack; /* Put instructions into here. */
4940 TInsn orig_insn; /* Original instruction from the input. */
4941 int i;
4942 symbolS *lit_sym = NULL;
4943
4944 if (frag_now->tc_frag_data.is_literal)
4945 {
4946 static bfd_boolean reported = 0;
4947 if (reported < 4)
4948 as_bad (_("cannot assemble '%s' into a literal fragment"), str);
4949 if (reported == 3)
4950 as_bad (_("..."));
4951 reported++;
4952 return;
4953 }
4954
4955 istack_init (&istack);
4956 tinsn_init (&orig_insn);
4957
4958 /* Split off the opcode. */
4959 opnamelen = strspn (str, "abcdefghijklmnopqrstuvwxyz_/0123456789.");
4960 opname = xmalloc (opnamelen + 1);
4961 memcpy (opname, str, opnamelen);
4962 opname[opnamelen] = '\0';
4963
4964 num_args = tokenize_arguments (arg_strings, str + opnamelen);
4965 if (num_args == -1)
4966 {
4967 as_bad (_("syntax error"));
4968 return;
4969 }
4970
4971 if (xg_translate_idioms (&opname, &num_args, arg_strings))
4972 return;
4973
4974 /* Check for an underbar prefix. */
4975 if (*opname == '_')
4976 {
4977 has_underbar = TRUE;
4978 opname += 1;
4979 }
4980
4981 orig_insn.insn_type = ITYPE_INSN;
4982 orig_insn.ntok = 0;
4983 orig_insn.is_specific_opcode = (has_underbar || !use_generics ());
4984 specific_opcode = orig_insn.is_specific_opcode;
4985
4986 orig_insn.opcode = xtensa_opcode_lookup (isa, opname);
4987 if (orig_insn.opcode == XTENSA_UNDEFINED)
4988 {
4989 as_bad (_("unknown opcode %s"), opname);
4990 return;
4991 }
4992
4993 if (frag_now_fix () != 0 && !frag_now->tc_frag_data.is_insn)
4994 {
4995 frag_wane (frag_now);
4996 frag_new (0);
4997 }
4998
4999 if (software_a0_b_retw_interlock)
5000 {
5001 if ((get_last_insn_flags (now_seg, now_subseg) & FLAG_IS_A0_WRITER) != 0
5002 && is_conditional_branch_opcode (orig_insn.opcode))
5003 {
5004 has_a0_b_retw = TRUE;
5005
5006 /* Mark this fragment with the special RELAX_ADD_NOP_IF_A0_B_RETW.
5007 After the first assembly pass we will check all of them and
5008 add a nop if needed. */
5009 frag_now->tc_frag_data.is_insn = TRUE;
5010 frag_var (rs_machine_dependent, 4, 4,
5011 RELAX_ADD_NOP_IF_A0_B_RETW,
5012 frag_now->fr_symbol, frag_now->fr_offset, NULL);
5013 frag_now->tc_frag_data.is_insn = TRUE;
5014 frag_var (rs_machine_dependent, 4, 4,
5015 RELAX_ADD_NOP_IF_A0_B_RETW,
5016 frag_now->fr_symbol, frag_now->fr_offset, NULL);
5017 }
5018 }
5019
5020 /* Special case: The call instructions should be marked "specific opcode"
5021 to keep them from expanding. */
5022 if (!use_longcalls () && is_direct_call_opcode (orig_insn.opcode))
5023 orig_insn.is_specific_opcode = TRUE;
5024
5025 /* Parse the arguments. */
5026 if (parse_arguments (&orig_insn, num_args, arg_strings))
5027 {
5028 as_bad (_("syntax error"));
5029 return;
5030 }
5031
5032 /* Free the opcode and argument strings, now that they've been parsed. */
5033 free (has_underbar ? opname - 1 : opname);
5034 opname = 0;
5035 while (num_args-- > 0)
5036 free (arg_strings[num_args]);
5037
5038 /* Check for the right number and type of arguments. */
5039 if (tinsn_check_arguments (&orig_insn))
5040 return;
5041
5042 /* See if the instruction implies an aligned section. */
5043 if (is_entry_opcode (orig_insn.opcode) || is_loop_opcode (orig_insn.opcode))
5044 record_alignment (now_seg, 2);
5045
5046 xg_add_branch_and_loop_targets (&orig_insn);
5047
5048 /* Special cases for instructions that force an alignment... */
5049 if (!orig_insn.is_specific_opcode && is_loop_opcode (orig_insn.opcode))
5050 {
5051 fragS *old_frag = frag_now;
5052 offsetT old_offset = frag_now_fix ();
5053 symbolS *old_sym = NULL;
5054 size_t max_fill;
5055
5056 frag_now->tc_frag_data.is_insn = TRUE;
5057 frag_now->tc_frag_data.is_no_density = !code_density_available ();
5058 max_fill = get_text_align_max_fill_size
5059 (get_text_align_power (XTENSA_FETCH_WIDTH),
5060 TRUE, frag_now->tc_frag_data.is_no_density);
5061 frag_var (rs_machine_dependent, max_fill, max_fill,
5062 RELAX_ALIGN_NEXT_OPCODE, frag_now->fr_symbol,
5063 frag_now->fr_offset, NULL);
5064
5065 /* Repeat until there are no more. */
5066 while ((old_sym = xtensa_find_label (old_frag, old_offset, FALSE)))
5067 {
5068 S_SET_VALUE (old_sym, (valueT) 0);
5069 symbol_set_frag (old_sym, frag_now);
5070 }
5071 }
5072
5073 /* Special count for "entry" instruction. */
5074 if (is_entry_opcode (orig_insn.opcode))
5075 {
5076 /* Check that the second opcode (#1) is >= 16. */
5077 if (orig_insn.ntok >= 2)
5078 {
5079 expressionS *exp = &orig_insn.tok[1];
5080 switch (exp->X_op)
5081 {
5082 case O_constant:
5083 if (exp->X_add_number < 16)
5084 as_warn (_("entry instruction with stack decrement < 16"));
5085 break;
5086
5087 default:
5088 as_warn (_("entry instruction with non-constant decrement"));
5089 }
5090 }
5091 }
5092
5093 if (!orig_insn.is_specific_opcode && is_entry_opcode (orig_insn.opcode))
5094 {
5095 xtensa_mark_literal_pool_location (TRUE);
5096
5097 /* Automatically align ENTRY instructions. */
5098 frag_align (2, 0, 0);
5099 }
5100
5101 if (software_a0_b_retw_interlock)
5102 set_last_insn_flags (now_seg, now_subseg, FLAG_IS_A0_WRITER,
5103 is_register_writer (&orig_insn, "a", 0));
5104
5105 set_last_insn_flags (now_seg, now_subseg, FLAG_IS_BAD_LOOPEND,
5106 is_bad_loopend_opcode (&orig_insn));
5107
5108 /* Finish it off:
5109 assemble_tokens (opcode, tok, ntok);
5110 expand the tokens from the orig_insn into the
5111 stack of instructions that will not expand
5112 unless required at relaxation time. */
5113 if (xg_expand_assembly_insn (&istack, &orig_insn))
5114 return;
5115
5116 for (i = 0; i < istack.ninsn; i++)
5117 {
5118 TInsn *insn = &istack.insn[i];
5119 if (insn->insn_type == ITYPE_LITERAL)
5120 {
5121 assert (lit_sym == NULL);
5122 lit_sym = xg_assemble_literal (insn);
5123 }
5124 else
5125 {
5126 if (lit_sym)
5127 xg_resolve_literals (insn, lit_sym);
5128 xg_assemble_tokens (insn);
5129 }
5130 }
5131
5132 /* Now, if the original opcode was a call... */
5133 if (align_targets && is_call_opcode (orig_insn.opcode))
5134 {
5135 frag_now->tc_frag_data.is_insn = TRUE;
5136 frag_var (rs_machine_dependent, 4, 4,
5137 RELAX_DESIRE_ALIGN,
5138 frag_now->fr_symbol,
5139 frag_now->fr_offset,
5140 NULL);
5141 }
5142}
5143
5144
5145/* TC_CONS_FIX_NEW hook: Check for "@PLT" suffix on symbol references.
5146 If found, use an XTENSA_PLT reloc for 4-byte values. Otherwise, this
5147 is the same as the standard code in read.c. */
5148
5149void
5150xtensa_cons_fix_new (frag, where, size, exp)
5151 fragS *frag;
5152 int where;
5153 int size;
5154 expressionS *exp;
5155{
5156 bfd_reloc_code_real_type r;
5157 bfd_boolean plt = FALSE;
5158
5159 if (*input_line_pointer == '@')
5160 {
5161 if (!strncmp (input_line_pointer, PLT_SUFFIX, strlen (PLT_SUFFIX) - 1)
5162 && !strncmp (input_line_pointer, plt_suffix,
5163 strlen (plt_suffix) - 1))
5164 {
5165 as_bad (_("undefined @ suffix '%s', expected '%s'"),
5166 input_line_pointer, plt_suffix);
5167 ignore_rest_of_line ();
5168 return;
5169 }
5170
5171 input_line_pointer += strlen (plt_suffix);
5172 plt = TRUE;
5173 }
5174
5175 switch (size)
5176 {
5177 case 1:
5178 r = BFD_RELOC_8;
5179 break;
5180 case 2:
5181 r = BFD_RELOC_16;
5182 break;
5183 case 4:
5184 r = plt ? BFD_RELOC_XTENSA_PLT : BFD_RELOC_32;
5185 break;
5186 case 8:
5187 r = BFD_RELOC_64;
5188 break;
5189 default:
5190 as_bad (_("unsupported BFD relocation size %u"), size);
5191 r = BFD_RELOC_32;
5192 break;
5193 }
5194 fix_new_exp (frag, where, size, exp, 0, r);
5195}
5196
5197
5198/* TC_FRAG_INIT hook */
5199
5200void
5201xtensa_frag_init (frag)
5202 fragS *frag;
5203{
5204 frag->tc_frag_data.is_no_density = !code_density_available ();
5205}
5206
5207
5208symbolS *
5209md_undefined_symbol (name)
5210 char *name ATTRIBUTE_UNUSED;
5211{
5212 return NULL;
5213}
5214
5215
5216/* Round up a section size to the appropriate boundary. */
5217
5218valueT
5219md_section_align (segment, size)
5220 segT segment ATTRIBUTE_UNUSED;
5221 valueT size;
5222{
5223 return size; /* Byte alignment is fine. */
5224}
5225
5226
5227long
5228md_pcrel_from (fixP)
5229 fixS *fixP;
5230{
5231 char *insn_p;
5232 static xtensa_insnbuf insnbuf = NULL;
5233 int opnum;
5234 xtensa_operand operand;
5235 xtensa_opcode opcode;
5236 xtensa_isa isa = xtensa_default_isa;
5237 valueT addr = fixP->fx_where + fixP->fx_frag->fr_address;
5238
5239 if (fixP->fx_done)
5240 return addr;
5241
5242 if (fixP->fx_r_type == BFD_RELOC_XTENSA_ASM_EXPAND)
5243 return addr;
5244
5245 if (!insnbuf)
5246 insnbuf = xtensa_insnbuf_alloc (isa);
5247
5248 insn_p = &fixP->fx_frag->fr_literal[fixP->fx_where];
5249 xtensa_insnbuf_from_chars (isa, insnbuf, insn_p);
5250 opcode = xtensa_decode_insn (isa, insnbuf);
5251
5252 opnum = reloc_to_opnum (fixP->fx_r_type);
5253
5254 if (opnum < 0)
5255 as_fatal (_("invalid operand relocation for '%s' instruction"),
5256 xtensa_opcode_name (isa, opcode));
5257 if (opnum >= xtensa_num_operands (isa, opcode))
5258 as_fatal (_("invalid relocation for operand %d in '%s' instruction"),
5259 opnum, xtensa_opcode_name (isa, opcode));
5260 operand = xtensa_get_operand (isa, opcode, opnum);
5261 if (!operand)
5262 {
5263 as_warn_where (fixP->fx_file,
5264 fixP->fx_line,
5265 _("invalid relocation type %d for %s instruction"),
5266 fixP->fx_r_type, xtensa_opcode_name (isa, opcode));
5267 return addr;
5268 }
5269
5270 if (!operand_is_pcrel_label (operand))
5271 {
5272 as_bad_where (fixP->fx_file,
5273 fixP->fx_line,
5274 _("invalid relocation for operand %d of '%s'"),
5275 opnum, xtensa_opcode_name (isa, opcode));
5276 return addr;
5277 }
5278 if (!xtensa_operand_isPCRelative (operand))
5279 {
5280 as_warn_where (fixP->fx_file,
5281 fixP->fx_line,
5282 _("non-PCREL relocation operand %d for '%s': %s"),
5283 opnum, xtensa_opcode_name (isa, opcode),
5284 bfd_get_reloc_code_name (fixP->fx_r_type));
5285 return addr;
5286 }
5287
5288 return 0 - xtensa_operand_do_reloc (operand, 0, addr);
5289}
5290
5291
5292/* tc_symbol_new_hook */
5293
5294void
5295xtensa_symbol_new_hook (symbolP)
5296 symbolS *symbolP;
5297{
5298 symbolP->sy_tc.plt = 0;
5299}
5300
5301
5302/* tc_fix_adjustable hook */
5303
5304bfd_boolean
5305xtensa_fix_adjustable (fixP)
5306 fixS *fixP;
5307{
5308 /* We need the symbol name for the VTABLE entries. */
5309 if (fixP->fx_r_type == BFD_RELOC_VTABLE_INHERIT
5310 || fixP->fx_r_type == BFD_RELOC_VTABLE_ENTRY)
5311 return 0;
5312
5313 return 1;
5314}
5315
5316
5317void
5318md_apply_fix3 (fixP, valP, seg)
5319 fixS *fixP;
5320 valueT *valP;
5321 segT seg ATTRIBUTE_UNUSED;
5322{
5323 if (fixP->fx_pcrel == 0 && fixP->fx_addsy == 0)
5324 {
5325 /* This happens when the relocation is within the current section.
5326 It seems this implies a PCREL operation. We'll catch it and error
5327 if not. */
5328
5329 char *const fixpos = fixP->fx_frag->fr_literal + fixP->fx_where;
5330 static xtensa_insnbuf insnbuf = NULL;
5331 xtensa_opcode opcode;
5332 xtensa_isa isa;
5333
5334 switch (fixP->fx_r_type)
5335 {
5336 case BFD_RELOC_XTENSA_ASM_EXPAND:
5337 fixP->fx_done = 1;
5338 break;
5339
5340 case BFD_RELOC_XTENSA_ASM_SIMPLIFY:
5341 as_bad (_("unhandled local relocation fix %s"),
5342 bfd_get_reloc_code_name (fixP->fx_r_type));
5343 break;
5344
5345 case BFD_RELOC_32:
5346 case BFD_RELOC_16:
5347 case BFD_RELOC_8:
5348 /* The only one we support that isn't an instruction field. */
5349 md_number_to_chars (fixpos, *valP, fixP->fx_size);
5350 fixP->fx_done = 1;
5351 break;
5352
5353 case BFD_RELOC_XTENSA_OP0:
5354 case BFD_RELOC_XTENSA_OP1:
5355 case BFD_RELOC_XTENSA_OP2:
5356 isa = xtensa_default_isa;
5357 if (!insnbuf)
5358 insnbuf = xtensa_insnbuf_alloc (isa);
5359
5360 xtensa_insnbuf_from_chars (isa, insnbuf, fixpos);
5361 opcode = xtensa_decode_insn (isa, insnbuf);
5362 if (opcode == XTENSA_UNDEFINED)
5363 as_fatal (_("undecodable FIX"));
5364
5365 xtensa_insnbuf_set_immediate_field (opcode, insnbuf, *valP,
5366 fixP->fx_file, fixP->fx_line);
5367
5368 fixP->fx_frag->tc_frag_data.is_insn = TRUE;
5369 xtensa_insnbuf_to_chars (isa, insnbuf, fixpos);
5370 fixP->fx_done = 1;
5371 break;
5372
5373 case BFD_RELOC_VTABLE_INHERIT:
5374 case BFD_RELOC_VTABLE_ENTRY:
5375 fixP->fx_done = 0;
5376 break;
5377
5378 default:
5379 as_bad (_("unhandled local relocation fix %s"),
5380 bfd_get_reloc_code_name (fixP->fx_r_type));
5381 }
5382 }
5383}
5384
5385
5386char *
5387md_atof (type, litP, sizeP)
5388 int type;
5389 char *litP;
5390 int *sizeP;
5391{
5392 int prec;
5393 LITTLENUM_TYPE words[4];
5394 char *t;
5395 int i;
5396
5397 switch (type)
5398 {
5399 case 'f':
5400 prec = 2;
5401 break;
5402
5403 case 'd':
5404 prec = 4;
5405 break;
5406
5407 default:
5408 *sizeP = 0;
5409 return "bad call to md_atof";
5410 }
5411
5412 t = atof_ieee (input_line_pointer, type, words);
5413 if (t)
5414 input_line_pointer = t;
5415
5416 *sizeP = prec * 2;
5417
5418 for (i = prec - 1; i >= 0; i--)
5419 {
5420 int idx = i;
5421 if (target_big_endian)
5422 idx = (prec - 1 - i);
5423
5424 md_number_to_chars (litP, (valueT) words[idx], 2);
5425 litP += 2;
5426 }
5427
5428 return NULL;
5429}
5430
5431
5432int
5433md_estimate_size_before_relax (fragP, seg)
5434 fragS *fragP;
5435 segT seg ATTRIBUTE_UNUSED;
5436{
5437 return fragP->tc_frag_data.text_expansion;
5438}
5439
5440
5441/* Translate internal representation of relocation info to BFD target
5442 format. */
5443
5444arelent *
5445tc_gen_reloc (section, fixp)
5446 asection *section ATTRIBUTE_UNUSED;
5447 fixS *fixp;
5448{
5449 arelent *reloc;
5450
5451 reloc = (arelent *) xmalloc (sizeof (arelent));
5452 reloc->sym_ptr_ptr = (asymbol **) xmalloc (sizeof (asymbol *));
5453 *reloc->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy);
5454 reloc->address = fixp->fx_frag->fr_address + fixp->fx_where;
5455
5456 /* Make sure none of our internal relocations make it this far.
5457 They'd better have been fully resolved by this point. */
5458 assert ((int) fixp->fx_r_type > 0);
5459
5460 reloc->howto = bfd_reloc_type_lookup (stdoutput, fixp->fx_r_type);
5461 if (reloc->howto == NULL)
5462 {
5463 as_bad_where (fixp->fx_file, fixp->fx_line,
5464 _("cannot represent `%s' relocation in object file"),
5465 bfd_get_reloc_code_name (fixp->fx_r_type));
5466 return NULL;
5467 }
5468
5469 if (!fixp->fx_pcrel != !reloc->howto->pc_relative)
5470 {
5471 as_fatal (_("internal error? cannot generate `%s' relocation"),
5472 bfd_get_reloc_code_name (fixp->fx_r_type));
5473 }
5474 assert (!fixp->fx_pcrel == !reloc->howto->pc_relative);
5475
5476 reloc->addend = fixp->fx_offset;
5477
5478 switch (fixp->fx_r_type)
5479 {
5480 case BFD_RELOC_XTENSA_OP0:
5481 case BFD_RELOC_XTENSA_OP1:
5482 case BFD_RELOC_XTENSA_OP2:
5483 case BFD_RELOC_XTENSA_ASM_EXPAND:
5484 case BFD_RELOC_32:
5485 case BFD_RELOC_XTENSA_PLT:
5486 case BFD_RELOC_VTABLE_INHERIT:
5487 case BFD_RELOC_VTABLE_ENTRY:
5488 break;
5489
5490 case BFD_RELOC_XTENSA_ASM_SIMPLIFY:
5491 as_warn (_("emitting simplification relocation"));
5492 break;
5493
5494 default:
5495 as_warn (_("emitting unknown relocation"));
5496 }
5497
5498 return reloc;
5499}
5500
5501
5502
5503void
5504xtensa_end ()
5505{
5506 directive_balance ();
5507 xtensa_move_literals ();
5508
5509 xtensa_reorder_segments ();
5510 xtensa_mark_target_fragments ();
5511 xtensa_cleanup_align_frags ();
5512 xtensa_fix_target_frags ();
5513 if (software_a0_b_retw_interlock && has_a0_b_retw)
5514 xtensa_fix_a0_b_retw_frags ();
5515 if (software_avoid_b_j_loop_end && maybe_has_b_j_loop_end)
5516 xtensa_fix_b_j_loop_end_frags ();
5517
5518 /* "close_loop_end" should be processed BEFORE "short_loop". */
5519 if (software_avoid_close_loop_end && maybe_has_close_loop_end)
5520 xtensa_fix_close_loop_end_frags ();
5521
5522 if (software_avoid_short_loop && maybe_has_short_loop)
5523 xtensa_fix_short_loop_frags ();
5524
5525 xtensa_sanity_check ();
5526}
5527
5528
5529static void
5530xtensa_cleanup_align_frags ()
5531{
5532 frchainS *frchP;
5533
5534 for (frchP = frchain_root; frchP; frchP = frchP->frch_next)
5535 {
5536 fragS *fragP;
5537
5538 /* Walk over all of the fragments in a subsection. */
5539 for (fragP = frchP->frch_root; fragP; fragP = fragP->fr_next)
5540 {
5541 if ((fragP->fr_type == rs_align
5542 || fragP->fr_type == rs_align_code
5543 || (fragP->fr_type == rs_machine_dependent
5544 && (fragP->fr_subtype == RELAX_DESIRE_ALIGN
5545 || fragP->fr_subtype == RELAX_DESIRE_ALIGN_IF_TARGET)))
5546 && fragP->fr_fix == 0)
5547 {
5548 fragS * next = fragP->fr_next;
5549
5550 while (next
5551 && next->fr_type == rs_machine_dependent
5552 && next->fr_subtype == RELAX_DESIRE_ALIGN_IF_TARGET)
5553 {
5554 frag_wane (next);
5555 next = next->fr_next;
5556 }
5557 }
5558 }
5559 }
5560}
5561
5562
5563/* Re-process all of the fragments looking to convert all of the
5564 RELAX_DESIRE_ALIGN_IF_TARGET fragments. If there is a branch
5565 target in the next fragment, convert this to RELAX_DESIRE_ALIGN.
5566 If the next fragment starts with a loop target, AND the previous
5567 fragment can be expanded to negate the branch, convert this to a
5568 RELAX_LOOP_END. Otherwise, convert to a .fill 0. */
5569
5570static void
5571xtensa_fix_target_frags ()
5572{
5573 frchainS *frchP;
5574
5575 /* When this routine is called, all of the subsections are still intact
5576 so we walk over subsections instead of sections. */
5577 for (frchP = frchain_root; frchP; frchP = frchP->frch_next)
5578 {
5579 bfd_boolean prev_frag_can_negate_branch = FALSE;
5580 fragS *fragP;
5581
5582 /* Walk over all of the fragments in a subsection. */
5583 for (fragP = frchP->frch_root; fragP; fragP = fragP->fr_next)
5584 {
5585 if (fragP->fr_type == rs_machine_dependent
5586 && fragP->fr_subtype == RELAX_DESIRE_ALIGN_IF_TARGET)
5587 {
5588 if (next_frag_is_loop_target (fragP))
5589 {
5590 if (prev_frag_can_negate_branch)
5591 fragP->fr_subtype = RELAX_LOOP_END;
5592 else
5593 {
5594 if (!align_only_targets ||
5595 next_frag_is_branch_target (fragP))
5596 fragP->fr_subtype = RELAX_DESIRE_ALIGN;
5597 else
5598 frag_wane (fragP);
5599 }
5600 }
5601 else if (!align_only_targets
5602 || next_frag_is_branch_target (fragP))
5603 fragP->fr_subtype = RELAX_DESIRE_ALIGN;
5604 else
5605 frag_wane (fragP);
5606 }
5607 if (fragP->fr_fix != 0)
5608 prev_frag_can_negate_branch = FALSE;
5609 if (frag_can_negate_branch (fragP))
5610 prev_frag_can_negate_branch = TRUE;
5611 }
5612 }
5613}
5614
5615
5616static bfd_boolean
5617frag_can_negate_branch (fragP)
5618 fragS *fragP;
5619{
5620 if (fragP->fr_type == rs_machine_dependent
5621 && fragP->fr_subtype == RELAX_IMMED)
5622 {
5623 TInsn t_insn;
5624 tinsn_from_chars (&t_insn, fragP->fr_opcode);
5625 if (is_negatable_branch (&t_insn))
5626 return TRUE;
5627 }
5628 return FALSE;
5629}
5630
5631
5632/* Re-process all of the fragments looking to convert all of the
5633 RELAX_ADD_NOP_IF_A0_B_RETW. If the next instruction is a
5634 conditional branch or a retw/retw.n, convert this frag to one that
5635 will generate a NOP. In any case close it off with a .fill 0. */
5636
5637static void
5638xtensa_fix_a0_b_retw_frags ()
5639{
5640 frchainS *frchP;
5641
5642 /* When this routine is called, all of the subsections are still intact
5643 so we walk over subsections instead of sections. */
5644 for (frchP = frchain_root; frchP; frchP = frchP->frch_next)
5645 {
5646 fragS *fragP;
5647
5648 /* Walk over all of the fragments in a subsection. */
5649 for (fragP = frchP->frch_root; fragP; fragP = fragP->fr_next)
5650 {
5651 if (fragP->fr_type == rs_machine_dependent
5652 && fragP->fr_subtype == RELAX_ADD_NOP_IF_A0_B_RETW)
5653 {
5654 if (next_instrs_are_b_retw (fragP))
5655 relax_frag_add_nop (fragP);
5656 else
5657 frag_wane (fragP);
5658 }
5659 }
5660 }
5661}
5662
5663
5664bfd_boolean
5665next_instrs_are_b_retw (fragP)
5666 fragS * fragP;
5667{
5668 xtensa_opcode opcode;
5669 const fragS *next_fragP = next_non_empty_frag (fragP);
5670 static xtensa_insnbuf insnbuf = NULL;
5671 xtensa_isa isa = xtensa_default_isa;
5672 int offset = 0;
5673
5674 if (!insnbuf)
5675 insnbuf = xtensa_insnbuf_alloc (isa);
5676
5677 if (next_fragP == NULL)
5678 return FALSE;
5679
5680 /* Check for the conditional branch. */
5681 xtensa_insnbuf_from_chars (isa, insnbuf, &next_fragP->fr_literal[offset]);
5682 opcode = xtensa_decode_insn (isa, insnbuf);
5683
5684 if (!is_conditional_branch_opcode (opcode))
5685 return FALSE;
5686
5687 offset += xtensa_insn_length (isa, opcode);
5688 if (offset == next_fragP->fr_fix)
5689 {
5690 next_fragP = next_non_empty_frag (next_fragP);
5691 offset = 0;
5692 }
5693 if (next_fragP == NULL)
5694 return FALSE;
5695
5696 /* Check for the retw/retw.n. */
5697 xtensa_insnbuf_from_chars (isa, insnbuf, &next_fragP->fr_literal[offset]);
5698 opcode = xtensa_decode_insn (isa, insnbuf);
5699
5700 if (is_windowed_return_opcode (opcode))
5701 return TRUE;
5702 return FALSE;
5703}
5704
5705
5706/* Re-process all of the fragments looking to convert all of the
5707 RELAX_ADD_NOP_IF_PRE_LOOP_END. If there is one instruction and a
5708 loop end label, convert this frag to one that will generate a NOP.
5709 In any case close it off with a .fill 0. */
5710
5711static void
5712xtensa_fix_b_j_loop_end_frags ()
5713{
5714 frchainS *frchP;
5715
5716 /* When this routine is called, all of the subsections are still intact
5717 so we walk over subsections instead of sections. */
5718 for (frchP = frchain_root; frchP; frchP = frchP->frch_next)
5719 {
5720 fragS *fragP;
5721
5722 /* Walk over all of the fragments in a subsection. */
5723 for (fragP = frchP->frch_root; fragP; fragP = fragP->fr_next)
5724 {
5725 if (fragP->fr_type == rs_machine_dependent
5726 && fragP->fr_subtype == RELAX_ADD_NOP_IF_PRE_LOOP_END)
5727 {
5728 if (next_instr_is_loop_end (fragP))
5729 relax_frag_add_nop (fragP);
5730 else
5731 frag_wane (fragP);
5732 }
5733 }
5734 }
5735}
5736
5737
5738bfd_boolean
5739next_instr_is_loop_end (fragP)
5740 fragS * fragP;
5741{
5742 const fragS *next_fragP;
5743
5744 if (next_frag_is_loop_target (fragP))
5745 return FALSE;
5746
5747 next_fragP = next_non_empty_frag (fragP);
5748 if (next_fragP == NULL)
5749 return FALSE;
5750
5751 if (!next_frag_is_loop_target (next_fragP))
5752 return FALSE;
5753
5754 /* If the size is >= 3 then there is more than one instruction here.
5755 The hardware bug will not fire. */
5756 if (next_fragP->fr_fix > 3)
5757 return FALSE;
5758
5759 return TRUE;
5760}
5761
5762
5763/* Re-process all of the fragments looking to convert all of the
5764 RELAX_ADD_NOP_IF_CLOSE_LOOP_END. If there is an loop end that is
5765 not MY loop's loop end within 12 bytes, add enough nops here to
5766 make it at least 12 bytes away. In any case close it off with a
5767 .fill 0. */
5768
5769static void
5770xtensa_fix_close_loop_end_frags ()
5771{
5772 frchainS *frchP;
5773
5774 /* When this routine is called, all of the subsections are still intact
5775 so we walk over subsections instead of sections. */
5776 for (frchP = frchain_root; frchP; frchP = frchP->frch_next)
5777 {
5778 fragS *fragP;
5779
5780 fragS *current_target = NULL;
5781 offsetT current_offset = 0;
5782
5783 /* Walk over all of the fragments in a subsection. */
5784 for (fragP = frchP->frch_root; fragP; fragP = fragP->fr_next)
5785 {
5786 if (fragP->fr_type == rs_machine_dependent
5787 && fragP->fr_subtype == RELAX_IMMED)
5788 {
5789 /* Read it. If the instruction is a loop, get the target. */
5790 xtensa_opcode opcode = get_opcode_from_buf (fragP->fr_opcode);
5791 if (is_loop_opcode (opcode))
5792 {
5793 TInsn t_insn;
5794
5795 tinsn_from_chars (&t_insn, fragP->fr_opcode);
5796 tinsn_immed_from_frag (&t_insn, fragP);
5797
5798 /* Get the current fragment target. */
5799 if (fragP->fr_symbol)
5800 {
5801 current_target = symbol_get_frag (fragP->fr_symbol);
5802 current_offset = fragP->fr_offset;
5803 }
5804 }
5805 }
5806
5807 if (current_target
5808 && fragP->fr_type == rs_machine_dependent
5809 && fragP->fr_subtype == RELAX_ADD_NOP_IF_CLOSE_LOOP_END)
5810 {
5811 size_t min_bytes;
5812 size_t bytes_added = 0;
5813
5814#define REQUIRED_LOOP_DIVIDING_BYTES 12
5815 /* Max out at 12. */
5816 min_bytes = min_bytes_to_other_loop_end
5817 (fragP->fr_next, current_target, current_offset,
5818 REQUIRED_LOOP_DIVIDING_BYTES);
5819
5820 if (min_bytes < REQUIRED_LOOP_DIVIDING_BYTES)
5821 {
5822 while (min_bytes + bytes_added
5823 < REQUIRED_LOOP_DIVIDING_BYTES)
5824 {
5825 int length = 3;
5826
5827 if (fragP->fr_var < length)
5828 as_warn (_("fr_var %lu < length %d; ignoring"),
5829 fragP->fr_var, length);
5830 else
5831 {
5832 assemble_nop (length,
5833 fragP->fr_literal + fragP->fr_fix);
5834 fragP->fr_fix += length;
5835 fragP->fr_var -= length;
5836 }
5837 bytes_added += length;
5838 }
5839 }
5840 frag_wane (fragP);
5841 }
5842 }
5843 }
5844}
5845
5846
5847size_t
5848min_bytes_to_other_loop_end (fragP, current_target, current_offset, max_size)
5849 fragS *fragP;
5850 fragS *current_target;
5851 offsetT current_offset;
5852 size_t max_size;
5853{
5854 size_t offset = 0;
5855 fragS *current_fragP;
5856
5857 for (current_fragP = fragP;
5858 current_fragP;
5859 current_fragP = current_fragP->fr_next)
5860 {
5861 if (current_fragP->tc_frag_data.is_loop_target
5862 && current_fragP != current_target)
5863 return offset + current_offset;
5864
5865 offset += unrelaxed_frag_min_size (current_fragP);
5866
5867 if (offset + current_offset >= max_size)
5868 return max_size;
5869 }
5870 return max_size;
5871}
5872
5873
5874size_t
5875unrelaxed_frag_min_size (fragP)
5876 fragS * fragP;
5877{
5878 size_t size = fragP->fr_fix;
5879
5880 /* add fill size */
5881 if (fragP->fr_type == rs_fill)
5882 size += fragP->fr_offset;
5883
5884 return size;
5885}
5886
5887
5888/* Re-process all of the fragments looking to convert all
5889 of the RELAX_ADD_NOP_IF_SHORT_LOOP. If:
5890
5891 A)
5892 1) the instruction size count to the loop end label
5893 is too short (<= 2 instructions),
5894 2) loop has a jump or branch in it
5895
5896 or B)
5897 1) software_avoid_all_short_loops is true
5898 2) The generating loop was a 'loopgtz' or 'loopnez'
5899 3) the instruction size count to the loop end label is too short
5900 (<= 2 instructions)
5901 then convert this frag (and maybe the next one) to generate a NOP.
5902 In any case close it off with a .fill 0. */
5903
5904static void
5905xtensa_fix_short_loop_frags ()
5906{
5907 frchainS *frchP;
5908
5909 /* When this routine is called, all of the subsections are still intact
5910 so we walk over subsections instead of sections. */
5911 for (frchP = frchain_root; frchP; frchP = frchP->frch_next)
5912 {
5913 fragS *fragP;
5914 fragS *current_target = NULL;
5915 offsetT current_offset = 0;
5916 xtensa_opcode current_opcode = XTENSA_UNDEFINED;
5917
5918 /* Walk over all of the fragments in a subsection. */
5919 for (fragP = frchP->frch_root; fragP; fragP = fragP->fr_next)
5920 {
5921 /* check on the current loop */
5922 if (fragP->fr_type == rs_machine_dependent
5923 && fragP->fr_subtype == RELAX_IMMED)
5924 {
5925 /* Read it. If the instruction is a loop, get the target. */
5926 xtensa_opcode opcode = get_opcode_from_buf (fragP->fr_opcode);
5927 if (is_loop_opcode (opcode))
5928 {
5929 TInsn t_insn;
5930
5931 tinsn_from_chars (&t_insn, fragP->fr_opcode);
5932 tinsn_immed_from_frag (&t_insn, fragP);
5933
5934 /* Get the current fragment target. */
5935 if (fragP->fr_symbol)
5936 {
5937 current_target = symbol_get_frag (fragP->fr_symbol);
5938 current_offset = fragP->fr_offset;
5939 current_opcode = opcode;
5940 }
5941 }
5942 }
5943
5944 if (fragP->fr_type == rs_machine_dependent
5945 && fragP->fr_subtype == RELAX_ADD_NOP_IF_SHORT_LOOP)
5946 {
5947 size_t insn_count =
5948 count_insns_to_loop_end (fragP->fr_next, TRUE, 3);
5949 if (insn_count < 3
5950 && (branch_before_loop_end (fragP->fr_next)
5951 || (software_avoid_all_short_loops
5952 && current_opcode != XTENSA_UNDEFINED
5953 && !is_the_loop_opcode (current_opcode))))
5954 relax_frag_add_nop (fragP);
5955 else
5956 frag_wane (fragP);
5957 }
5958 }
5959 }
5960}
5961
5962
5963size_t
5964count_insns_to_loop_end (base_fragP, count_relax_add, max_count)
5965 fragS *base_fragP;
5966 bfd_boolean count_relax_add;
5967 size_t max_count;
5968{
5969 fragS *fragP = NULL;
5970 size_t insn_count = 0;
5971
5972 fragP = base_fragP;
5973
5974 for (; fragP && !fragP->tc_frag_data.is_loop_target; fragP = fragP->fr_next)
5975 {
5976 insn_count += unrelaxed_frag_min_insn_count (fragP);
5977 if (insn_count >= max_count)
5978 return max_count;
5979
5980 if (count_relax_add)
5981 {
5982 if (fragP->fr_type == rs_machine_dependent
5983 && fragP->fr_subtype == RELAX_ADD_NOP_IF_SHORT_LOOP)
5984 {
5985 /* In order to add the appropriate number of
5986 NOPs, we count an instruction for downstream
5987 occurrences. */
5988 insn_count++;
5989 if (insn_count >= max_count)
5990 return max_count;
5991 }
5992 }
5993 }
5994 return insn_count;
5995}
5996
5997
5998size_t
5999unrelaxed_frag_min_insn_count (fragP)
6000 fragS *fragP;
6001{
6002 size_t insn_count = 0;
6003 int offset = 0;
6004
6005 if (!fragP->tc_frag_data.is_insn)
6006 return insn_count;
6007
6008 /* Decode the fixed instructions. */
6009 while (offset < fragP->fr_fix)
6010 {
6011 xtensa_opcode opcode = get_opcode_from_buf (fragP->fr_literal + offset);
6012 if (opcode == XTENSA_UNDEFINED)
6013 {
6014 as_fatal (_("undecodable instruction in instruction frag"));
6015 return insn_count;
6016 }
6017 offset += xtensa_insn_length (xtensa_default_isa, opcode);
6018 insn_count++;
6019 }
6020
6021 return insn_count;
6022}
6023
6024
6025bfd_boolean
6026branch_before_loop_end (base_fragP)
6027 fragS *base_fragP;
6028{
6029 fragS *fragP;
6030
6031 for (fragP = base_fragP;
6032 fragP && !fragP->tc_frag_data.is_loop_target;
6033 fragP = fragP->fr_next)
6034 {
6035 if (unrelaxed_frag_has_b_j (fragP))
6036 return TRUE;
6037 }
6038 return FALSE;
6039}
6040
6041
6042bfd_boolean
6043unrelaxed_frag_has_b_j (fragP)
6044 fragS *fragP;
6045{
6046 size_t insn_count = 0;
6047 int offset = 0;
6048
6049 if (!fragP->tc_frag_data.is_insn)
6050 return FALSE;
6051
6052 /* Decode the fixed instructions. */
6053 while (offset < fragP->fr_fix)
6054 {
6055 xtensa_opcode opcode = get_opcode_from_buf (fragP->fr_literal + offset);
6056 if (opcode == XTENSA_UNDEFINED)
6057 {
6058 as_fatal (_("undecodable instruction in instruction frag"));
6059 return insn_count;
6060 }
6061 if (is_branch_or_jump_opcode (opcode))
6062 return TRUE;
6063 offset += xtensa_insn_length (xtensa_default_isa, opcode);
6064 }
6065 return FALSE;
6066}
6067
6068
6069/* Checks to be made after initial assembly but before relaxation. */
6070
6071static void
6072xtensa_sanity_check ()
6073{
6074 char *file_name;
6075 int line;
6076
6077 frchainS *frchP;
6078
6079 as_where (&file_name, &line);
6080 for (frchP = frchain_root; frchP; frchP = frchP->frch_next)
6081 {
6082 fragS *fragP;
6083
6084 /* Walk over all of the fragments in a subsection. */
6085 for (fragP = frchP->frch_root; fragP; fragP = fragP->fr_next)
6086 {
6087 /* Currently we only check for empty loops here. */
6088 if (fragP->fr_type == rs_machine_dependent
6089 && fragP->fr_subtype == RELAX_IMMED)
6090 {
6091 static xtensa_insnbuf insnbuf = NULL;
6092 TInsn t_insn;
6093
6094 if (fragP->fr_opcode != NULL)
6095 {
6096 if (!insnbuf)
6097 insnbuf = xtensa_insnbuf_alloc (xtensa_default_isa);
6098 tinsn_from_chars (&t_insn, fragP->fr_opcode);
6099 tinsn_immed_from_frag (&t_insn, fragP);
6100
6101 if (is_loop_opcode (t_insn.opcode))
6102 {
6103 if (is_empty_loop (&t_insn, fragP))
6104 {
6105 new_logical_line (fragP->fr_file, fragP->fr_line);
6106 as_bad (_("invalid empty loop"));
6107 }
6108 if (!is_local_forward_loop (&t_insn, fragP))
6109 {
6110 new_logical_line (fragP->fr_file, fragP->fr_line);
6111 as_bad (_("loop target does not follow "
6112 "loop instruction in section"));
6113 }
6114 }
6115 }
6116 }
6117 }
6118 }
6119 new_logical_line (file_name, line);
6120}
6121
6122
6123#define LOOP_IMMED_OPN 1
6124
6125/* Return true if the loop target is the next non-zero fragment. */
6126
6127bfd_boolean
6128is_empty_loop (insn, fragP)
6129 const TInsn *insn;
6130 fragS *fragP;
6131{
6132 const expressionS *expr;
6133 symbolS *symbolP;
6134 fragS *next_fragP;
6135
6136 if (insn->insn_type != ITYPE_INSN)
6137 return FALSE;
6138
6139 if (!is_loop_opcode (insn->opcode))
6140 return FALSE;
6141
6142 if (insn->ntok <= LOOP_IMMED_OPN)
6143 return FALSE;
6144
6145 expr = &insn->tok[LOOP_IMMED_OPN];
6146
6147 if (expr->X_op != O_symbol)
6148 return FALSE;
6149
6150 symbolP = expr->X_add_symbol;
6151 if (!symbolP)
6152 return FALSE;
6153
6154 if (symbol_get_frag (symbolP) == NULL)
6155 return FALSE;
6156
6157 if (S_GET_VALUE (symbolP) != 0)
6158 return FALSE;
6159
6160 /* Walk through the zero-size fragments from this one. If we find
6161 the target fragment, then this is a zero-size loop. */
6162 for (next_fragP = fragP->fr_next;
6163 next_fragP != NULL;
6164 next_fragP = next_fragP->fr_next)
6165 {
6166 if (next_fragP == symbol_get_frag (symbolP))
6167 return TRUE;
6168 if (next_fragP->fr_fix != 0)
6169 return FALSE;
6170 }
6171 return FALSE;
6172}
6173
6174
6175bfd_boolean
6176is_local_forward_loop (insn, fragP)
6177 const TInsn *insn;
6178 fragS *fragP;
6179{
6180 const expressionS *expr;
6181 symbolS *symbolP;
6182 fragS *next_fragP;
6183
6184 if (insn->insn_type != ITYPE_INSN)
6185 return FALSE;
6186
6187 if (!is_loop_opcode (insn->opcode))
6188 return FALSE;
6189
6190 if (insn->ntok <= LOOP_IMMED_OPN)
6191 return FALSE;
6192
6193 expr = &insn->tok[LOOP_IMMED_OPN];
6194
6195 if (expr->X_op != O_symbol)
6196 return FALSE;
6197
6198 symbolP = expr->X_add_symbol;
6199 if (!symbolP)
6200 return FALSE;
6201
6202 if (symbol_get_frag (symbolP) == NULL)
6203 return FALSE;
6204
6205 /* Walk through fragments until we find the target.
6206 If we do not find the target, then this is an invalid loop. */
6207 for (next_fragP = fragP->fr_next;
6208 next_fragP != NULL;
6209 next_fragP = next_fragP->fr_next)
6210 if (next_fragP == symbol_get_frag (symbolP))
6211 return TRUE;
6212
6213 return FALSE;
6214}
6215
6216
6217
6218/* Alignment Functions. */
6219
6220size_t
6221get_text_align_power (target_size)
6222 int target_size;
6223{
6224 size_t i = 0;
6225 for (i = 0; i < sizeof (size_t); i++)
6226 {
6227 if (target_size <= (1 << i))
6228 return i;
6229 }
6230 as_fatal (_("get_text_align_power: argument too large"));
6231 return 0;
6232}
6233
6234
6235addressT
6236get_text_align_max_fill_size (align_pow, use_nops, use_no_density)
6237 int align_pow;
6238 bfd_boolean use_nops;
6239 bfd_boolean use_no_density;
6240{
6241 if (!use_nops)
6242 return (1 << align_pow);
6243 if (use_no_density)
6244 return 3 * (1 << align_pow);
6245
6246 return 1 + (1 << align_pow);
6247}
6248
6249
6250/* get_text_align_fill_size ()
6251
6252 Desired alignments:
6253 give the address
6254 target_size = size of next instruction
6255 align_pow = get_text_align_power (target_size).
6256 use_nops = 0
6257 use_no_density = 0;
6258 Loop alignments:
6259 address = current address + loop instruction size;
6260 target_size = 3 (for 2 or 3 byte target)
6261 = 8 (for 8 byte target)
6262 align_pow = get_text_align_power (target_size);
6263 use_nops = 1
6264 use_no_density = set appropriately
6265 Text alignments:
6266 address = current address + loop instruction size;
6267 target_size = 0
6268 align_pow = get_text_align_power (target_size);
6269 use_nops = 0
6270 use_no_density = 0. */
6271
6272addressT
6273get_text_align_fill_size (address, align_pow, target_size,
6274 use_nops, use_no_density)
6275 addressT address;
6276 int align_pow;
6277 int target_size;
6278 bfd_boolean use_nops;
6279 bfd_boolean use_no_density;
6280{
6281 /* Input arguments:
6282
6283 align_pow: log2 (required alignment).
6284
6285 target_size: alignment must allow the new_address and
6286 new_address+target_size-1.
6287
6288 use_nops: if true, then we can only use 2 or 3 byte nops.
6289
6290 use_no_density: if use_nops and use_no_density, we can only use
6291 3-byte nops.
6292
6293 Usually, for non-zero target_size, the align_pow is the power of 2
6294 that is greater than or equal to the target_size. This handles the
6295 2-byte, 3-byte and 8-byte instructions. */
6296
6297 size_t alignment = (1 << align_pow);
6298 if (!use_nops)
6299 {
6300 /* This is the easy case. */
6301 size_t mod;
6302 mod = address % alignment;
6303 if (mod != 0)
6304 mod = alignment - mod;
6305 assert ((address + mod) % alignment == 0);
6306 return mod;
6307 }
6308
6309 /* This is the slightly harder case. */
6310 assert ((int) alignment >= target_size);
6311 assert (target_size > 0);
6312 if (!use_no_density)
6313 {
6314 size_t i;
6315 for (i = 0; i < alignment * 2; i++)
6316 {
6317 if (i == 1)
6318 continue;
6319 if ((address + i) >> align_pow ==
6320 (address + i + target_size - 1) >> align_pow)
6321 return i;
6322 }
6323 }
6324 else
6325 {
6326 size_t i;
6327
6328 /* Can only fill multiples of 3. */
6329 for (i = 0; i <= alignment * 3; i += 3)
6330 {
6331 if ((address + i) >> align_pow ==
6332 (address + i + target_size - 1) >> align_pow)
6333 return i;
6334 }
6335 }
6336 assert (0);
6337 return 0;
6338}
6339
6340
6341/* This will assert if it is not possible. */
6342
6343size_t
6344get_text_align_nop_count (fill_size, use_no_density)
6345 size_t fill_size;
6346 bfd_boolean use_no_density;
6347{
6348 size_t count = 0;
6349 if (use_no_density)
6350 {
6351 assert (fill_size % 3 == 0);
6352 return (fill_size / 3);
6353 }
6354
6355 assert (fill_size != 1); /* Bad argument. */
6356
6357 while (fill_size > 1)
6358 {
6359 size_t insn_size = 3;
6360 if (fill_size == 2 || fill_size == 4)
6361 insn_size = 2;
6362 fill_size -= insn_size;
6363 count++;
6364 }
6365 assert (fill_size != 1); /* Bad algorithm. */
6366 return count;
6367}
6368
6369
6370size_t
6371get_text_align_nth_nop_size (fill_size, n, use_no_density)
6372 size_t fill_size;
6373 size_t n;
6374 bfd_boolean use_no_density;
6375{
6376 size_t count = 0;
6377
6378 assert (get_text_align_nop_count (fill_size, use_no_density) > n);
6379
6380 if (use_no_density)
6381 return 3;
6382
6383 while (fill_size > 1)
6384 {
6385 size_t insn_size = 3;
6386 if (fill_size == 2 || fill_size == 4)
6387 insn_size = 2;
6388 fill_size -= insn_size;
6389 count++;
6390 if (n + 1 == count)
6391 return insn_size;
6392 }
6393 assert (0);
6394 return 0;
6395}
6396
6397
6398/* For the given fragment, find the appropriate address
6399 for it to begin at if we are using NOPs to align it. */
6400
6401static addressT
6402get_noop_aligned_address (fragP, address)
6403 fragS *fragP;
6404 addressT address;
6405{
6406 static xtensa_insnbuf insnbuf = NULL;
6407 size_t fill_size = 0;
6408
6409 if (!insnbuf)
6410 insnbuf = xtensa_insnbuf_alloc (xtensa_default_isa);
6411
6412 switch (fragP->fr_type)
6413 {
6414 case rs_machine_dependent:
6415 if (fragP->fr_subtype == RELAX_ALIGN_NEXT_OPCODE)
6416 {
6417 /* The rule is: get next fragment's FIRST instruction. Find
6418 the smallest number of bytes that need to be added to
6419 ensure that the next fragment's FIRST instruction will fit
6420 in a single word.
6421
6422 E.G., 2 bytes : 0, 1, 2 mod 4
6423 3 bytes: 0, 1 mod 4
6424
6425 If the FIRST instruction MIGHT be relaxed,
6426 assume that it will become a 3 byte instruction. */
6427
6428 int target_insn_size;
6429 xtensa_opcode opcode = next_frag_opcode (fragP);
6430 addressT pre_opcode_bytes;
6431
6432 if (opcode == XTENSA_UNDEFINED)
6433 {
6434 as_bad_where (fragP->fr_file, fragP->fr_line,
6435 _("invalid opcode for RELAX_ALIGN_NEXT_OPCODE"));
6436 as_fatal (_("cannot continue"));
6437 }
6438
6439 target_insn_size = xtensa_insn_length (xtensa_default_isa, opcode);
6440
6441 pre_opcode_bytes = next_frag_pre_opcode_bytes (fragP);
6442
6443 if (is_loop_opcode (opcode))
6444 {
6445 /* next_fragP should be the loop. */
6446 const fragS *next_fragP = next_non_empty_frag (fragP);
6447 xtensa_opcode next_opcode = next_frag_opcode (next_fragP);
6448 size_t alignment;
6449
6450 pre_opcode_bytes += target_insn_size;
6451
6452 /* For loops, the alignment depends on the size of the
6453 instruction following the loop, not the loop instruction. */
6454 if (next_opcode == XTENSA_UNDEFINED)
6455 target_insn_size = 3;
6456 else
6457 {
6458 target_insn_size =
6459 xtensa_insn_length (xtensa_default_isa, next_opcode);
6460
6461 if (target_insn_size == 2)
6462 target_insn_size = 3; /* ISA specifies this. */
6463 }
6464
6465 /* If it was 8, then we'll need a larger alignment
6466 for the section. */
6467 alignment = get_text_align_power (target_insn_size);
6468
6469 /* Is Now_seg valid */
6470 record_alignment (now_seg, alignment);
6471 }
6472 else
6473 as_fatal (_("expected loop opcode in relax align next target"));
6474
6475 fill_size = get_text_align_fill_size
6476 (address + pre_opcode_bytes,
6477 get_text_align_power (target_insn_size),
6478 target_insn_size, TRUE, fragP->tc_frag_data.is_no_density);
6479 }
6480 break;
6481#if 0
6482 case rs_align:
6483 case rs_align_code:
6484 fill_size = get_text_align_fill_size
6485 (address, fragP->fr_offset, 1, TRUE,
6486 fragP->tc_frag_data.is_no_density);
6487 break;
6488#endif
6489 default:
6490 as_fatal (_("expected align_code or RELAX_ALIGN_NEXT_OPCODE"));
6491 }
6492
6493 return address + fill_size;
6494}
6495
6496
6497/* 3 mechanisms for relaxing an alignment:
6498
6499 Align to a power of 2.
6500 Align so the next fragment's instruction does not cross a word boundary.
6501 Align the current instruction so that if the next instruction
6502 were 3 bytes, it would not cross a word boundary.
6503
6504 We can align with:
6505
6506 zeros - This is easy; always insert zeros.
6507 nops - 3 and 2 byte instructions
6508 2 - 2 byte nop
6509 3 - 3 byte nop
6510 4 - 2, 2-byte nops
6511 >=5 : 3 byte instruction + fn(n-3)
6512 widening - widen previous instructions. */
6513
6514static addressT
6515get_widen_aligned_address (fragP, address)
6516 fragS *fragP;
6517 addressT address;
6518{
6519 addressT align_pow, new_address, loop_insn_offset;
6520 fragS *next_frag;
6521 int insn_size;
6522 xtensa_opcode opcode, next_opcode;
6523 static xtensa_insnbuf insnbuf = NULL;
6524
6525 if (!insnbuf)
6526 insnbuf = xtensa_insnbuf_alloc (xtensa_default_isa);
6527
6528 if (fragP->fr_type == rs_align || fragP->fr_type == rs_align_code)
6529 {
6530 align_pow = fragP->fr_offset;
6531 new_address = ((address + ((1 << align_pow) - 1))
6532 << align_pow) >> align_pow;
6533 return new_address;
6534 }
6535
6536 if (fragP->fr_type == rs_machine_dependent)
6537 {
6538 switch (fragP->fr_subtype)
6539 {
6540 case RELAX_DESIRE_ALIGN:
6541
6542 /* The rule is: get the next fragment's FIRST instruction.
6543 Find the smallest number of bytes needed to be added
6544 in order to ensure that the next fragment is FIRST
6545 instruction will fit in a single word.
6546 i.e. 2 bytes : 0, 1, 2. mod 4
6547 3 bytes: 0, 1 mod 4
6548 If the FIRST instruction MIGHT be relaxed,
6549 assume that it will become a 3-byte instruction. */
6550
6551 insn_size = 3;
6552 /* Check to see if it might be 2 bytes. */
6553 next_opcode = next_frag_opcode (fragP);
6554 if (next_opcode != XTENSA_UNDEFINED
6555 && xtensa_insn_length (xtensa_default_isa, next_opcode) == 2)
6556 insn_size = 2;
6557
6558 assert (insn_size <= 4);
6559 for (new_address = address; new_address < address + 4; new_address++)
6560 {
6561 if (new_address >> 2 == (new_address + insn_size - 1) >> 2)
6562 return new_address;
6563 }
6564 as_bad (_("internal error aligning"));
6565 return address;
6566
6567 case RELAX_ALIGN_NEXT_OPCODE:
6568 /* The rule is: get next fragment's FIRST instruction.
6569 Find the smallest number of bytes needed to be added
6570 in order to ensure that the next fragment's FIRST
6571 instruction will fit in a single word.
6572 i.e. 2 bytes : 0, 1, 2. mod 4
6573 3 bytes: 0, 1 mod 4
6574 If the FIRST instruction MIGHT be relaxed,
6575 assume that it will become a 3 byte instruction. */
6576
6577 opcode = next_frag_opcode (fragP);
6578 if (opcode == XTENSA_UNDEFINED)
6579 {
6580 as_bad_where (fragP->fr_file, fragP->fr_line,
6581 _("invalid opcode for RELAX_ALIGN_NEXT_OPCODE"));
6582 as_fatal (_("cannot continue"));
6583 }
6584 insn_size = xtensa_insn_length (xtensa_default_isa, opcode);
6585 assert (insn_size <= 4);
6586 assert (is_loop_opcode (opcode));
6587
6588 loop_insn_offset = 0;
6589 next_frag = next_non_empty_frag (fragP);
6590
6591 /* If the loop has been expanded then the loop
6592 instruction could be at an offset from this fragment. */
6593 if (next_frag->fr_subtype != RELAX_IMMED)
6594 loop_insn_offset = get_expanded_loop_offset (opcode);
6595
6596 for (new_address = address; new_address < address + 4; new_address++)
6597 {
6598 if ((new_address + loop_insn_offset + insn_size) >> 2 ==
6599 (new_address + loop_insn_offset + insn_size + 2) >> 2)
6600 return new_address;
6601 }
6602 as_bad (_("internal error aligning"));
6603 return address;
6604
6605 default:
6606 as_bad (_("internal error aligning"));
6607 return address;
6608 }
6609 }
6610 as_bad (_("internal error aligning"));
6611 return address;
6612}
6613
6614
6615
6616/* md_relax_frag Hook and Helper Functions. */
6617
6618/* Return the number of bytes added to this fragment, given that the
6619 input has been stretched already by "stretch". */
6620
6621long
6622xtensa_relax_frag (fragP, stretch, stretched_p)
6623 fragS *fragP;
6624 long stretch;
6625 int *stretched_p;
6626{
6627 int unreported = fragP->tc_frag_data.unreported_expansion;
6628 long new_stretch = 0;
6629 char *file_name;
6630 int line, lit_size;
6631
6632 as_where (&file_name, &line);
6633 new_logical_line (fragP->fr_file, fragP->fr_line);
6634
6635 fragP->tc_frag_data.unreported_expansion = 0;
6636
6637 switch (fragP->fr_subtype)
6638 {
6639 case RELAX_ALIGN_NEXT_OPCODE:
6640 /* Always convert. */
6641 new_stretch = relax_frag_text_align (fragP, stretch);
6642 break;
6643
6644 case RELAX_LOOP_END:
6645 /* Do nothing. */
6646 break;
6647
6648 case RELAX_LOOP_END_ADD_NOP:
6649 /* Add a NOP and switch to .fill 0. */
6650 new_stretch = relax_frag_add_nop (fragP);
6651 break;
6652
6653 case RELAX_DESIRE_ALIGN:
6654 /* We REALLY want to change the relaxation order here. This
6655 should do NOTHING. The narrowing before it will either align
6656 it or not. */
6657 break;
6658
6659 case RELAX_LITERAL:
6660 case RELAX_LITERAL_FINAL:
6661 return 0;
6662
6663 case RELAX_LITERAL_NR:
6664 lit_size = 4;
6665 fragP->fr_subtype = RELAX_LITERAL_FINAL;
6666 assert (unreported == lit_size);
6667 memset (&fragP->fr_literal[fragP->fr_fix], 0, 4);
6668 fragP->fr_var -= lit_size;
6669 fragP->fr_fix += lit_size;
6670 new_stretch = 4;
6671 break;
6672
6673 case RELAX_NARROW:
6674 new_stretch = relax_frag_narrow (fragP, stretch);
6675 break;
6676
6677 case RELAX_IMMED:
6678 case RELAX_IMMED_STEP1:
6679 case RELAX_IMMED_STEP2:
6680 /* Place the immediate. */
6681 new_stretch = relax_frag_immed (now_seg, fragP, stretch,
6682 fragP->fr_subtype - RELAX_IMMED,
6683 stretched_p);
6684 break;
6685
6686 case RELAX_LITERAL_POOL_BEGIN:
6687 case RELAX_LITERAL_POOL_END:
6688 /* No relaxation required. */
6689 break;
6690
6691 default:
6692 as_bad (_("bad relaxation state"));
6693 }
6694
6695 new_logical_line (file_name, line);
6696 return new_stretch;
6697}
6698
6699
6700static long
6701relax_frag_text_align (fragP, stretch)
6702 fragS *fragP;
6703 long stretch;
6704{
6705 addressT old_address, old_next_address, old_size;
6706 addressT new_address, new_next_address, new_size;
6707 addressT growth;
6708
6709 /* Overview of the relaxation procedure for alignment
6710 inside an executable section:
6711
6712 The old size is stored in the tc_frag_data.text_expansion field.
6713
6714 Calculate the new address, fix up the text_expansion and
6715 return the growth. */
6716
6717 /* Calculate the old address of this fragment and the next fragment. */
6718 old_address = fragP->fr_address - stretch;
6719 old_next_address = (fragP->fr_address - stretch + fragP->fr_fix +
6720 fragP->tc_frag_data.text_expansion);
6721 old_size = old_next_address - old_address;
6722
6723 /* Calculate the new address of this fragment and the next fragment. */
6724 new_address = fragP->fr_address;
6725 new_next_address =
6726 get_noop_aligned_address (fragP, fragP->fr_address + fragP->fr_fix);
6727 new_size = new_next_address - new_address;
6728
6729 growth = new_size - old_size;
6730
6731 /* Fix up the text_expansion field and return the new growth. */
6732 fragP->tc_frag_data.text_expansion += growth;
6733 return growth;
6734}
6735
6736
6737/* Add a NOP (i.e., "or a1, a1, a1"). Use the 3-byte one because we
6738 don't know about the availability of density yet. TODO: When the
6739 flags are stored per fragment, use NOP.N when possible. */
6740
6741static long
6742relax_frag_add_nop (fragP)
6743 fragS *fragP;
6744{
6745 static xtensa_insnbuf insnbuf = NULL;
6746 TInsn t_insn;
6747 char *nop_buf = fragP->fr_literal + fragP->fr_fix;
6748 int length;
6749 if (!insnbuf)
6750 insnbuf = xtensa_insnbuf_alloc (xtensa_default_isa);
6751
6752 tinsn_init (&t_insn);
6753 t_insn.opcode = xtensa_or_opcode;
6754 assert (t_insn.opcode != XTENSA_UNDEFINED);
6755
6756 t_insn.ntok = 3;
6757 set_expr_const (&t_insn.tok[0], 1);
6758 set_expr_const (&t_insn.tok[1], 1);
6759 set_expr_const (&t_insn.tok[2], 1);
6760
6761 tinsn_to_insnbuf (&t_insn, insnbuf);
6762 fragP->tc_frag_data.is_insn = TRUE;
6763 xtensa_insnbuf_to_chars (xtensa_default_isa, insnbuf, nop_buf);
6764
6765 length = xtensa_insn_length (xtensa_default_isa, t_insn.opcode);
6766 if (fragP->fr_var < length)
6767 {
6768 as_warn (_("fr_var (%ld) < length (%d); ignoring"),
6769 fragP->fr_var, length);
6770 frag_wane (fragP);
6771 return 0;
6772 }
6773
6774 fragP->fr_fix += length;
6775 fragP->fr_var -= length;
6776 frag_wane (fragP);
6777 return length;
6778}
6779
6780
6781static long
6782relax_frag_narrow (fragP, stretch)
6783 fragS *fragP;
6784 long stretch;
6785{
6786 /* Overview of the relaxation procedure for alignment inside an
6787 executable section: Find the number of widenings required and the
6788 number of nop bytes required. Store the number of bytes ALREADY
6789 widened. If there are enough instructions to widen (must go back
6790 ONLY through NARROW fragments), mark each of the fragments as TO BE
6791 widened, recalculate the fragment addresses. */
6792
6793 assert (fragP->fr_type == rs_machine_dependent
6794 && fragP->fr_subtype == RELAX_NARROW);
6795
6796 if (!future_alignment_required (fragP, 0))
6797 {
6798 /* If already expanded but no longer needed because of a prior
6799 stretch, it is SAFE to unexpand because the next fragment will
6800 NEVER start at an address > the previous time through the
6801 relaxation. */
6802 if (fragP->tc_frag_data.text_expansion)
6803 {
6804 if (stretch > 0)
6805 {
6806 fragP->tc_frag_data.text_expansion = 0;
6807 return -1;
6808 }
6809 /* Otherwise we have to live with this bad choice. */
6810 return 0;
6811 }
6812 return 0;
6813 }
6814
6815 if (fragP->tc_frag_data.text_expansion == 0)
6816 {
6817 fragP->tc_frag_data.text_expansion = 1;
6818 return 1;
6819 }
6820
6821 return 0;
6822}
6823
6824
6825static bfd_boolean
6826future_alignment_required (fragP, stretch)
6827 fragS *fragP;
6828 long stretch;
6829{
6830 long address = fragP->fr_address + stretch;
6831 int num_widens = 0;
6832 addressT aligned_address;
6833 offsetT desired_diff;
6834
6835 while (fragP)
6836 {
6837 /* Limit this to a small search. */
6838 if (num_widens > 8)
6839 return FALSE;
6840 address += fragP->fr_fix;
6841
6842 switch (fragP->fr_type)
6843 {
6844 case rs_fill:
6845 address += fragP->fr_offset * fragP->fr_var;
6846 break;
6847
6848 case rs_machine_dependent:
6849 switch (fragP->fr_subtype)
6850 {
6851 case RELAX_NARROW:
6852 /* address += fragP->fr_fix; */
6853 num_widens++;
6854 break;
6855
6856 case RELAX_IMMED:
6857 address += (/* fragP->fr_fix + */
6858 fragP->tc_frag_data.text_expansion);
6859 break;
6860
6861 case RELAX_ALIGN_NEXT_OPCODE:
6862 case RELAX_DESIRE_ALIGN:
6863 /* address += fragP->fr_fix; */
6864 aligned_address = get_widen_aligned_address (fragP, address);
6865 desired_diff = aligned_address - address;
6866 assert (desired_diff >= 0);
6867 /* If there are enough wideners in between do it. */
6868 /* return (num_widens == desired_diff); */
6869 if (num_widens == desired_diff)
6870 return TRUE;
6871 if (fragP->fr_subtype == RELAX_ALIGN_NEXT_OPCODE)
6872 return FALSE;
6873 break;
6874
6875 default:
6876 return FALSE;
6877 }
6878 break;
6879
6880 default:
6881 return FALSE;
6882 }
6883 fragP = fragP->fr_next;
6884 }
6885
6886 return FALSE;
6887}
6888
6889
6890static long
6891relax_frag_immed (segP, fragP, stretch, min_steps, stretched_p)
6892 segT segP;
6893 fragS *fragP;
6894 long stretch;
6895 int min_steps;
6896 int *stretched_p;
6897{
6898 static xtensa_insnbuf insnbuf = NULL;
6899 TInsn t_insn;
6900 int old_size;
6901 bfd_boolean negatable_branch = FALSE;
6902 bfd_boolean branch_jmp_to_next = FALSE;
6903 IStack istack;
6904 offsetT frag_offset;
6905 int num_steps;
6906 fragS *lit_fragP;
6907 int num_text_bytes, num_literal_bytes;
6908 int literal_diff, text_diff;
6909
6910 assert (fragP->fr_opcode != NULL);
6911
6912 if (!insnbuf)
6913 insnbuf = xtensa_insnbuf_alloc (xtensa_default_isa);
6914
6915 tinsn_from_chars (&t_insn, fragP->fr_opcode);
6916 tinsn_immed_from_frag (&t_insn, fragP);
6917
6918 negatable_branch = is_negatable_branch (&t_insn);
6919
6920 old_size = xtensa_insn_length (xtensa_default_isa, t_insn.opcode);
6921
6922 if (software_avoid_b_j_loop_end)
6923 branch_jmp_to_next = is_branch_jmp_to_next (&t_insn, fragP);
6924
6925 /* Special case: replace a branch to the next instruction with a NOP.
6926 This is required to work around a hardware bug in T1040.0 and also
6927 serves as an optimization. */
6928
6929 if (branch_jmp_to_next
6930 && ((old_size == 2) || (old_size == 3))
6931 && !next_frag_is_loop_target (fragP))
6932 return 0;
6933
6934 /* Here is the fun stuff: Get the immediate field from this
6935 instruction. If it fits, we are done. If not, find the next
6936 instruction sequence that fits. */
6937
6938 frag_offset = fragP->fr_opcode - fragP->fr_literal;
6939 istack_init (&istack);
6940 num_steps = xg_assembly_relax (&istack, &t_insn, segP, fragP, frag_offset,
6941 min_steps, stretch);
6942 if (num_steps < min_steps)
6943 {
6944 as_fatal (_("internal error: relaxation failed"));
6945 return 0;
6946 }
6947
6948 if (num_steps > RELAX_IMMED_MAXSTEPS)
6949 {
6950 as_fatal (_("internal error: relaxation requires too many steps"));
6951 return 0;
6952 }
6953
6954 fragP->fr_subtype = (int) RELAX_IMMED + num_steps;
6955
6956 /* Figure out the number of bytes needed. */
6957 lit_fragP = 0;
6958 num_text_bytes = get_num_stack_text_bytes (&istack) - old_size;
6959 num_literal_bytes = get_num_stack_literal_bytes (&istack);
6960 literal_diff = num_literal_bytes - fragP->tc_frag_data.literal_expansion;
6961 text_diff = num_text_bytes - fragP->tc_frag_data.text_expansion;
6962
6963 /* It MUST get larger. If not, we could get an infinite loop. */
6964 know (num_text_bytes >= 0);
6965 know (literal_diff >= 0 && text_diff >= 0);
6966
6967 fragP->tc_frag_data.text_expansion = num_text_bytes;
6968 fragP->tc_frag_data.literal_expansion = num_literal_bytes;
6969
6970 /* Find the associated expandable literal for this. */
6971 if (literal_diff != 0)
6972 {
6973 lit_fragP = fragP->tc_frag_data.literal_frag;
6974 if (lit_fragP)
6975 {
6976 assert (literal_diff == 4);
6977 lit_fragP->tc_frag_data.unreported_expansion += literal_diff;
6978
6979 /* We expect that the literal section state has NOT been
6980 modified yet. */
6981 assert (lit_fragP->fr_type == rs_machine_dependent
6982 && lit_fragP->fr_subtype == RELAX_LITERAL);
6983 lit_fragP->fr_subtype = RELAX_LITERAL_NR;
6984
6985 /* We need to mark this section for another iteration
6986 of relaxation. */
6987 (*stretched_p)++;
6988 }
6989 }
6990
6991 /* This implicitly uses the assumption that a branch is negated
6992 when the size of the output increases by at least 2 bytes. */
6993
6994 if (negatable_branch && num_text_bytes >= 2)
6995 {
6996 /* If next frag is a loop end, then switch it to add a NOP. */
6997 update_next_frag_nop_state (fragP);
6998 }
6999
7000 return text_diff;
7001}
7002
7003
7004
7005/* md_convert_frag Hook and Helper Functions. */
7006
7007void
7008md_convert_frag (abfd, sec, fragp)
7009 bfd *abfd ATTRIBUTE_UNUSED;
7010 segT sec;
7011 fragS *fragp;
7012{
7013 char *file_name;
7014 int line;
7015
7016 as_where (&file_name, &line);
7017 new_logical_line (fragp->fr_file, fragp->fr_line);
7018
7019 switch (fragp->fr_subtype)
7020 {
7021 case RELAX_ALIGN_NEXT_OPCODE:
7022 /* Always convert. */
7023 convert_frag_align_next_opcode (fragp);
7024 break;
7025
7026 case RELAX_DESIRE_ALIGN:
7027 /* Do nothing. If not aligned already, too bad. */
7028 break;
7029
7030 case RELAX_LITERAL:
7031 case RELAX_LITERAL_FINAL:
7032 break;
7033
7034 case RELAX_NARROW:
7035 /* No conversion. */
7036 convert_frag_narrow (fragp);
7037 break;
7038
7039 case RELAX_IMMED:
7040 case RELAX_IMMED_STEP1:
7041 case RELAX_IMMED_STEP2:
7042 /* Place the immediate. */
7043 convert_frag_immed (sec, fragp, fragp->fr_subtype - RELAX_IMMED);
7044 break;
7045
7046 case RELAX_LITERAL_NR:
7047 if (use_literal_section)
7048 {
7049 /* This should have been handled during relaxation. When
7050 relaxing a code segment, literals sometimes need to be
7051 added to the corresponding literal segment. If that
7052 literal segment has already been relaxed, then we end up
7053 in this situation. Marking the literal segments as data
7054 would make this happen less often (since GAS always relaxes
7055 code before data), but we could still get into trouble if
7056 there are instructions in a segment that is not marked as
7057 containing code. Until we can implement a better solution,
7058 cheat and adjust the addresses of all the following frags.
7059 This could break subsequent alignments, but the linker's
7060 literal coalescing will do that anyway. */
7061
7062 fragS *f;
7063 fragp->fr_subtype = RELAX_LITERAL_FINAL;
7064 assert (fragp->tc_frag_data.unreported_expansion == 4);
7065 memset (&fragp->fr_literal[fragp->fr_fix], 0, 4);
7066 fragp->fr_var -= 4;
7067 fragp->fr_fix += 4;
7068 for (f = fragp->fr_next; f; f = f->fr_next)
7069 f->fr_address += 4;
7070 }
7071 else
7072 as_bad (_("invalid relaxation fragment result"));
7073 break;
7074 }
7075
7076 fragp->fr_var = 0;
7077 new_logical_line (file_name, line);
7078}
7079
7080
7081void
7082convert_frag_align_next_opcode (fragp)
7083 fragS *fragp;
7084{
7085 char *nop_buf; /* Location for Writing. */
7086 size_t i;
7087
7088 bfd_boolean use_no_density = fragp->tc_frag_data.is_no_density;
7089 addressT aligned_address;
7090 size_t fill_size, nop_count;
7091
7092 aligned_address = get_noop_aligned_address (fragp, fragp->fr_address +
7093 fragp->fr_fix);
7094 fill_size = aligned_address - (fragp->fr_address + fragp->fr_fix);
7095 nop_count = get_text_align_nop_count (fill_size, use_no_density);
7096 nop_buf = fragp->fr_literal + fragp->fr_fix;
7097
7098 for (i = 0; i < nop_count; i++)
7099 {
7100 size_t nop_size;
7101 nop_size = get_text_align_nth_nop_size (fill_size, i, use_no_density);
7102
7103 assemble_nop (nop_size, nop_buf);
7104 nop_buf += nop_size;
7105 }
7106
7107 fragp->fr_fix += fill_size;
7108 fragp->fr_var -= fill_size;
7109}
7110
7111
7112static void
7113convert_frag_narrow (fragP)
7114 fragS *fragP;
7115{
7116 static xtensa_insnbuf insnbuf = NULL;
7117 TInsn t_insn, single_target;
7118 int size, old_size, diff, error_val;
7119 offsetT frag_offset;
7120
7121 if (fragP->tc_frag_data.text_expansion == 0)
7122 {
7123 /* No conversion. */
7124 fragP->fr_var = 0;
7125 return;
7126 }
7127
7128 assert (fragP->fr_opcode != NULL);
7129
7130 if (!insnbuf)
7131 insnbuf = xtensa_insnbuf_alloc (xtensa_default_isa);
7132
7133 tinsn_from_chars (&t_insn, fragP->fr_opcode);
7134 tinsn_immed_from_frag (&t_insn, fragP);
7135
7136 /* Just convert it to a wide form.... */
7137 size = 0;
7138 old_size = xtensa_insn_length (xtensa_default_isa, t_insn.opcode);
7139
7140 tinsn_init (&single_target);
7141 frag_offset = fragP->fr_opcode - fragP->fr_literal;
7142
7143 error_val = xg_expand_narrow (&single_target, &t_insn);
7144 if (error_val)
7145 as_bad (_("unable to widen instruction"));
7146
7147 size = xtensa_insn_length (xtensa_default_isa, single_target.opcode);
7148 xg_emit_insn_to_buf (&single_target, fragP->fr_opcode,
7149 fragP, frag_offset, TRUE);
7150
7151 diff = size - old_size;
7152 assert (diff >= 0);
7153 assert (diff <= fragP->fr_var);
7154 fragP->fr_var -= diff;
7155 fragP->fr_fix += diff;
7156
7157 /* clean it up */
7158 fragP->fr_var = 0;
7159}
7160
7161
7162static void
7163convert_frag_immed (segP, fragP, min_steps)
7164 segT segP;
7165 fragS *fragP;
7166 int min_steps;
7167{
7168 char *immed_instr = fragP->fr_opcode;
7169 static xtensa_insnbuf insnbuf = NULL;
7170 TInsn orig_t_insn;
7171 bfd_boolean expanded = FALSE;
7172 char *fr_opcode = fragP->fr_opcode;
7173 bfd_boolean branch_jmp_to_next = FALSE;
7174 int size;
7175
7176 assert (fragP->fr_opcode != NULL);
7177
7178 if (!insnbuf)
7179 insnbuf = xtensa_insnbuf_alloc (xtensa_default_isa);
7180
7181 tinsn_from_chars (&orig_t_insn, fragP->fr_opcode);
7182 tinsn_immed_from_frag (&orig_t_insn, fragP);
7183
7184 /* Here is the fun stuff: Get the immediate field from this
7185 instruction. If it fits, we're done. If not, find the next
7186 instruction sequence that fits. */
7187
7188 if (software_avoid_b_j_loop_end)
7189 branch_jmp_to_next = is_branch_jmp_to_next (&orig_t_insn, fragP);
7190
7191 if (branch_jmp_to_next && !next_frag_is_loop_target (fragP))
7192 {
7193 /* Conversion just inserts a NOP and marks the fix as completed. */
7194 size = xtensa_insn_length (xtensa_default_isa, orig_t_insn.opcode);
7195 assemble_nop (size, fragP->fr_opcode);
7196 fragP->fr_var = 0;
7197 }
7198 else
7199 {
7200 IStack istack;
7201 int i;
7202 symbolS *lit_sym = NULL;
7203 int total_size = 0;
7204 int old_size;
7205 int diff;
7206 symbolS *gen_label = NULL;
7207 offsetT frag_offset;
7208
7209 /* It does not fit. Find something that does and
7210 convert immediately. */
7211 frag_offset = fragP->fr_opcode - fragP->fr_literal;
7212 istack_init (&istack);
7213 xg_assembly_relax (&istack, &orig_t_insn,
7214 segP, fragP, frag_offset, min_steps, 0);
7215
7216 old_size = xtensa_insn_length (xtensa_default_isa, orig_t_insn.opcode);
7217
7218 /* Assemble this right inline. */
7219
7220 /* First, create the mapping from a label name to the REAL label. */
7221 total_size = 0;
7222 for (i = 0; i < istack.ninsn; i++)
7223 {
7224 TInsn *t_insn = &istack.insn[i];
7225 int size = 0;
7226 fragS *lit_frag;
7227
7228 switch (t_insn->insn_type)
7229 {
7230 case ITYPE_LITERAL:
7231 if (lit_sym != NULL)
7232 as_bad (_("multiple literals in expansion"));
7233 /* First find the appropriate space in the literal pool. */
7234 lit_frag = fragP->tc_frag_data.literal_frag;
7235 if (lit_frag == NULL)
7236 as_bad (_("no registered fragment for literal"));
7237 if (t_insn->ntok != 1)
7238 as_bad (_("number of literal tokens != 1"));
7239
7240 /* Set the literal symbol and add a fixup. */
7241 lit_sym = lit_frag->fr_symbol;
7242 break;
7243
7244 case ITYPE_LABEL:
7245 assert (gen_label == NULL);
7246 gen_label = symbol_new (FAKE_LABEL_NAME, now_seg,
7247 fragP->fr_opcode - fragP->fr_literal +
7248 total_size, fragP);
7249 break;
7250
7251 case ITYPE_INSN:
7252 size = xtensa_insn_length (xtensa_default_isa, t_insn->opcode);
7253 total_size += size;
7254 break;
7255 }
7256 }
7257
7258 total_size = 0;
7259 for (i = 0; i < istack.ninsn; i++)
7260 {
7261 TInsn *t_insn = &istack.insn[i];
7262 fragS *lit_frag;
7263 int size;
7264 segT target_seg;
7265
7266 switch (t_insn->insn_type)
7267 {
7268 case ITYPE_LITERAL:
7269 lit_frag = fragP->tc_frag_data.literal_frag;
7270 /* already checked */
7271 assert (lit_frag != NULL);
7272 assert (lit_sym != NULL);
7273 assert (t_insn->ntok == 1);
7274 /* add a fixup */
7275 target_seg = S_GET_SEGMENT (lit_sym);
7276 assert (target_seg);
7277 fix_new_exp_in_seg (target_seg, 0, lit_frag, 0, 4,
7278 &t_insn->tok[0], FALSE, BFD_RELOC_32);
7279 break;
7280
7281 case ITYPE_LABEL:
7282 break;
7283
7284 case ITYPE_INSN:
7285 xg_resolve_labels (t_insn, gen_label);
7286 xg_resolve_literals (t_insn, lit_sym);
7287 size = xtensa_insn_length (xtensa_default_isa, t_insn->opcode);
7288 total_size += size;
7289 xg_emit_insn_to_buf (t_insn, immed_instr, fragP,
7290 immed_instr - fragP->fr_literal, TRUE);
7291 immed_instr += size;
7292 break;
7293 }
7294 }
7295
7296 diff = total_size - old_size;
7297 assert (diff >= 0);
7298 if (diff != 0)
7299 expanded = TRUE;
7300 assert (diff <= fragP->fr_var);
7301 fragP->fr_var -= diff;
7302 fragP->fr_fix += diff;
7303 }
7304
7305 /* Clean it up. */
7306 fragP->fr_var = 0;
7307
7308 /* Check for undefined immediates in LOOP instructions. */
7309 if (is_loop_opcode (orig_t_insn.opcode))
7310 {
7311 symbolS *sym;
7312 sym = orig_t_insn.tok[1].X_add_symbol;
7313 if (sym != NULL && !S_IS_DEFINED (sym))
7314 {
7315 as_bad (_("unresolved loop target symbol: %s"), S_GET_NAME (sym));
7316 return;
7317 }
7318 sym = orig_t_insn.tok[1].X_op_symbol;
7319 if (sym != NULL && !S_IS_DEFINED (sym))
7320 {
7321 as_bad (_("unresolved loop target symbol: %s"), S_GET_NAME (sym));
7322 return;
7323 }
7324 }
7325
7326 if (expanded && is_loop_opcode (orig_t_insn.opcode))
7327 convert_frag_immed_finish_loop (segP, fragP, &orig_t_insn);
7328
7329 if (expanded && is_direct_call_opcode (orig_t_insn.opcode))
7330 {
7331 /* Add an expansion note on the expanded instruction. */
7332 fix_new_exp_in_seg (now_seg, 0, fragP, fr_opcode - fragP->fr_literal, 4,
7333 &orig_t_insn.tok[0], TRUE,
7334 BFD_RELOC_XTENSA_ASM_EXPAND);
7335
7336 }
7337}
7338
7339
7340/* Add a new fix expression into the desired segment. We have to
7341 switch to that segment to do this. */
7342
7343static fixS *
7344fix_new_exp_in_seg (new_seg, new_subseg,
7345 frag, where, size, exp, pcrel, r_type)
7346 segT new_seg;
7347 subsegT new_subseg;
7348 fragS *frag;
7349 int where;
7350 int size;
7351 expressionS *exp;
7352 int pcrel;
7353 bfd_reloc_code_real_type r_type;
7354{
7355 fixS *new_fix;
7356 segT seg = now_seg;
7357 subsegT subseg = now_subseg;
7358 assert (new_seg != 0);
7359 subseg_set (new_seg, new_subseg);
7360
7361 if (r_type == BFD_RELOC_32
7362 && exp->X_add_symbol
7363 && exp->X_add_symbol->sy_tc.plt == 1)
7364 {
7365 r_type = BFD_RELOC_XTENSA_PLT;
7366 }
7367
7368 new_fix = fix_new_exp (frag, where, size, exp, pcrel, r_type);
7369 subseg_set (seg, subseg);
7370 return new_fix;
7371}
7372
7373
7374/* Relax a loop instruction so that it can span loop >256 bytes. */
7375/*
7376 loop as, .L1
7377 .L0:
7378 rsr as, LEND
7379 wsr as, LBEG
7380 addi as, as, lo8(label-.L1)
7381 addmi as, as, mid8(label-.L1)
7382 wsr as, LEND
7383 isync
7384 rsr as, LCOUNT
7385 addi as, as, 1
7386 .L1:
7387 <<body>>
7388 label: */
7389
7390static void
7391convert_frag_immed_finish_loop (segP, fragP, t_insn)
7392 segT segP;
7393 fragS *fragP;
7394 TInsn *t_insn;
7395{
7396 TInsn loop_insn;
7397 TInsn addi_insn;
7398 TInsn addmi_insn;
7399 unsigned long target;
7400 static xtensa_insnbuf insnbuf = NULL;
7401 unsigned int loop_length, loop_length_hi, loop_length_lo;
7402 xtensa_isa isa = xtensa_default_isa;
7403 addressT loop_offset;
7404 addressT addi_offset = 9;
7405 addressT addmi_offset = 12;
7406
7407 if (!insnbuf)
7408 insnbuf = xtensa_insnbuf_alloc (isa);
7409
7410 /* Get the loop offset. */
7411 loop_offset = get_expanded_loop_offset (t_insn->opcode);
7412 /* Validate that there really is a LOOP at the loop_offset. */
7413 tinsn_from_chars (&loop_insn, fragP->fr_opcode + loop_offset);
7414
7415 if (!is_loop_opcode (loop_insn.opcode))
7416 {
7417 as_bad_where (fragP->fr_file, fragP->fr_line,
7418 _("loop relaxation specification does not correspond"));
7419 assert (0);
7420 }
7421 addi_offset += loop_offset;
7422 addmi_offset += loop_offset;
7423
7424 assert (t_insn->ntok == 2);
7425 target = get_expression_value (segP, &t_insn->tok[1]);
7426
7427 know (symbolP);
7428 know (symbolP->sy_frag);
7429 know (!(S_GET_SEGMENT (symbolP) == absolute_section)
7430 || symbol_get_frag (symbolP) == &zero_address_frag);
7431
7432 loop_length = target - (fragP->fr_address + fragP->fr_fix);
7433 loop_length_hi = loop_length & ~0x0ff;
7434 loop_length_lo = loop_length & 0x0ff;
7435 if (loop_length_lo >= 128)
7436 {
7437 loop_length_lo -= 256;
7438 loop_length_hi += 256;
7439 }
7440
7441 /* Because addmi sign-extends the immediate, 'loop_length_hi' can be at most
7442 32512. If the loop is larger than that, then we just fail. */
7443 if (loop_length_hi > 32512)
7444 as_bad_where (fragP->fr_file, fragP->fr_line,
7445 _("loop too long for LOOP instruction"));
7446
7447 tinsn_from_chars (&addi_insn, fragP->fr_opcode + addi_offset);
7448 assert (addi_insn.opcode == xtensa_addi_opcode);
7449
7450 tinsn_from_chars (&addmi_insn, fragP->fr_opcode + addmi_offset);
7451 assert (addmi_insn.opcode == xtensa_addmi_opcode);
7452
7453 set_expr_const (&addi_insn.tok[2], loop_length_lo);
7454 tinsn_to_insnbuf (&addi_insn, insnbuf);
7455
7456 fragP->tc_frag_data.is_insn = TRUE;
7457 xtensa_insnbuf_to_chars (isa, insnbuf, fragP->fr_opcode + addi_offset);
7458
7459 set_expr_const (&addmi_insn.tok[2], loop_length_hi);
7460 tinsn_to_insnbuf (&addmi_insn, insnbuf);
7461 xtensa_insnbuf_to_chars (isa, insnbuf, fragP->fr_opcode + addmi_offset);
7462}
7463
7464
7465static offsetT
7466get_expression_value (segP, exp)
7467 segT segP;
7468 expressionS *exp;
7469{
7470 if (exp->X_op == O_constant)
7471 return exp->X_add_number;
7472 if (exp->X_op == O_symbol)
7473 {
7474 /* Find the fragment. */
7475 symbolS *sym = exp->X_add_symbol;
7476
7477 assert (S_GET_SEGMENT (sym) == segP
7478 || S_GET_SEGMENT (sym) == absolute_section);
7479
7480 return (S_GET_VALUE (sym) + exp->X_add_number);
7481 }
7482 as_bad (_("invalid expression evaluation type %d"), exp->X_op);
7483 return 0;
7484}
7485
7486
7487
7488/* A map that keeps information on a per-subsegment basis. This is
7489 maintained during initial assembly, but is invalid once the
7490 subsegments are smashed together. I.E., it cannot be used during
7491 the relaxation. */
7492
7493typedef struct subseg_map_struct
7494{
7495 /* the key */
7496 segT seg;
7497 subsegT subseg;
7498
7499 /* the data */
7500 unsigned flags;
7501
7502 struct subseg_map_struct *next;
7503} subseg_map;
7504
7505static subseg_map *sseg_map = NULL;
7506
7507
7508static unsigned
7509get_last_insn_flags (seg, subseg)
7510 segT seg;
7511 subsegT subseg;
7512{
7513 subseg_map *subseg_e;
7514
7515 for (subseg_e = sseg_map; subseg_e != NULL; subseg_e = subseg_e->next)
7516 if (seg == subseg_e->seg && subseg == subseg_e->subseg)
7517 return subseg_e->flags;
7518
7519 return 0;
7520}
7521
7522
7523static void
7524set_last_insn_flags (seg, subseg, fl, val)
7525 segT seg;
7526 subsegT subseg;
7527 unsigned fl;
7528 bfd_boolean val;
7529{
7530 subseg_map *subseg_e;
7531
7532 for (subseg_e = sseg_map; subseg_e; subseg_e = subseg_e->next)
7533 if (seg == subseg_e->seg && subseg == subseg_e->subseg)
7534 break;
7535
7536 if (!subseg_e)
7537 {
7538 subseg_e = (subseg_map *) xmalloc (sizeof (subseg_map));
7539 memset (subseg_e, 0, sizeof (subseg_map));
7540 subseg_e->seg = seg;
7541 subseg_e->subseg = subseg;
7542 subseg_e->flags = 0;
7543 subseg_e->next = sseg_map;
7544 sseg_map = subseg_e;
7545 }
7546
7547 if (val)
7548 subseg_e->flags |= fl;
7549 else
7550 subseg_e->flags &= ~fl;
7551}
7552
7553
7554
7555/* Segment Lists and emit_state Stuff. */
7556
7557/* Remove the segment from the global sections list. */
7558
7559static void
7560xtensa_remove_section (sec)
7561 segT sec;
7562{
7563 /* Handle brain-dead bfd_section_list_remove macro, which
7564 expect the address of the prior section's "next" field, not
7565 just the address of the section to remove. */
7566
7567 segT *ps_next_ptr = &stdoutput->sections;
7568 while (*ps_next_ptr != sec && *ps_next_ptr != NULL)
7569 ps_next_ptr = &(*ps_next_ptr)->next;
7570
7571 assert (*ps_next_ptr != NULL);
7572
7573 bfd_section_list_remove (stdoutput, ps_next_ptr);
7574}
7575
7576
7577static void
7578xtensa_insert_section (after_sec, sec)
7579 segT after_sec;
7580 segT sec;
7581{
7582 segT *after_sec_next;
7583 if (after_sec == NULL)
7584 after_sec_next = &stdoutput->sections;
7585 else
7586 after_sec_next = &after_sec->next;
7587
7588 bfd_section_list_insert (stdoutput, after_sec_next, sec);
7589}
7590
7591
7592static void
7593xtensa_move_seg_list_to_beginning (head)
7594 seg_list *head;
7595{
7596 head = head->next;
7597 while (head)
7598 {
7599 segT literal_section = head->seg;
7600
7601 /* Move the literal section to the front of the section list. */
7602 assert (literal_section);
7603 xtensa_remove_section (literal_section);
7604 xtensa_insert_section (NULL, literal_section);
7605
7606 head = head->next;
7607 }
7608}
7609
7610
7611void
7612xtensa_move_literals ()
7613{
7614 seg_list *segment;
7615 frchainS *frchain_from, *frchain_to;
7616 fragS *search_frag, *next_frag, *last_frag, *literal_pool, *insert_after;
7617 fragS **frag_splice;
7618 emit_state state;
7619 segT dest_seg;
7620 fixS *fix, *next_fix, **fix_splice;
7621
7622 /* As clunky as this is, we can't rely on frag_var
7623 and frag_variant to get called in all situations. */
7624
7625 segment = literal_head->next;
7626 while (segment)
7627 {
7628 frchain_from = seg_info (segment->seg)->frchainP;
7629 search_frag = frchain_from->frch_root;
7630 while (search_frag)
7631 {
7632 search_frag->tc_frag_data.is_literal = TRUE;
7633 search_frag = search_frag->fr_next;
7634 }
7635 segment = segment->next;
7636 }
7637
7638 if (use_literal_section)
7639 return;
7640
7641 segment = literal_head->next;
7642 while (segment)
7643 {
7644 frchain_from = seg_info (segment->seg)->frchainP;
7645 search_frag = frchain_from->frch_root;
7646 literal_pool = NULL;
7647 frchain_to = NULL;
7648 frag_splice = &(frchain_from->frch_root);
7649
7650 while (!search_frag->tc_frag_data.literal_frag)
7651 {
7652 assert (search_frag->fr_fix == 0
7653 || search_frag->fr_type == rs_align);
7654 search_frag = search_frag->fr_next;
7655 }
7656
7657 assert (search_frag->tc_frag_data.literal_frag->fr_subtype
7658 == RELAX_LITERAL_POOL_BEGIN);
7659 xtensa_switch_section_emit_state (&state, segment->seg, 0);
7660
7661 /* Make sure that all the frags in this series are closed, and
7662 that there is at least one left over of zero-size. This
7663 prevents us from making a segment with an frchain without any
7664 frags in it. */
7665 frag_variant (rs_fill, 0, 0, 0, NULL, 0, NULL);
7666 last_frag = frag_now;
7667 frag_variant (rs_fill, 0, 0, 0, NULL, 0, NULL);
7668
7669 while (search_frag != frag_now)
7670 {
7671 next_frag = search_frag->fr_next;
7672
7673 /* First, move the frag out of the literal section and
7674 to the appropriate place. */
7675 if (search_frag->tc_frag_data.literal_frag)
7676 {
7677 literal_pool = search_frag->tc_frag_data.literal_frag;
7678 assert (literal_pool->fr_subtype == RELAX_LITERAL_POOL_BEGIN);
7679 /* Note that we set this fr_var to be a fix
7680 chain when we created the literal pool location
7681 as RELAX_LITERAL_POOL_BEGIN. */
7682 frchain_to = (frchainS *) literal_pool->fr_var;
7683 }
7684 insert_after = literal_pool;
7685
7686 while (insert_after->fr_next->fr_subtype != RELAX_LITERAL_POOL_END)
7687 insert_after = insert_after->fr_next;
7688
7689 dest_seg = (segT) insert_after->fr_next->fr_var;
7690
7691 *frag_splice = next_frag;
7692 search_frag->fr_next = insert_after->fr_next;
7693 insert_after->fr_next = search_frag;
7694 search_frag->tc_frag_data.lit_seg = dest_seg;
7695
7696 /* Now move any fixups associated with this frag to the
7697 right section. */
7698 fix = frchain_from->fix_root;
7699 fix_splice = &(frchain_from->fix_root);
7700 while (fix)
7701 {
7702 next_fix = fix->fx_next;
7703 if (fix->fx_frag == search_frag)
7704 {
7705 *fix_splice = next_fix;
7706 fix->fx_next = frchain_to->fix_root;
7707 frchain_to->fix_root = fix;
7708 if (frchain_to->fix_tail == NULL)
7709 frchain_to->fix_tail = fix;
7710 }
7711 else
7712 fix_splice = &(fix->fx_next);
7713 fix = next_fix;
7714 }
7715 search_frag = next_frag;
7716 }
7717
7718 if (frchain_from->fix_root != NULL)
7719 {
7720 frchain_from = seg_info (segment->seg)->frchainP;
7721 as_warn (_("fixes not all moved from %s"), segment->seg->name);
7722
7723 assert (frchain_from->fix_root == NULL);
7724 }
7725 frchain_from->fix_tail = NULL;
7726 xtensa_restore_emit_state (&state);
7727 segment = segment->next;
7728 }
7729
7730 xtensa_move_frag_symbols ();
7731}
7732
7733
7734static void
7735xtensa_move_frag_symbol (sym)
7736 symbolS *sym;
7737{
7738 fragS *frag = symbol_get_frag (sym);
7739
7740 if (frag->tc_frag_data.lit_seg != (segT) 0)
7741 S_SET_SEGMENT (sym, frag->tc_frag_data.lit_seg);
7742}
7743
7744
7745static void
7746xtensa_move_frag_symbols ()
7747{
7748 symbolS *symbolP;
7749
7750 /* Although you might think that only one of these lists should be
7751 searched, it turns out that the difference of the two sets
7752 (either way) is not empty. They do overlap quite a bit,
7753 however. */
7754
7755 for (symbolP = symbol_rootP; symbolP; symbolP = symbolP->sy_next)
7756 xtensa_move_frag_symbol (symbolP);
7757
7758 map_over_defined_symbols (xtensa_move_frag_symbol);
7759}
7760
7761
7762static void
7763xtensa_reorder_seg_list (head, after)
7764 seg_list *head;
7765 segT after;
7766{
7767 /* Move all of the sections in the section list to come
7768 after "after" in the gnu segment list. */
7769
7770 head = head->next;
7771 while (head)
7772 {
7773 segT literal_section = head->seg;
7774
7775 /* Move the literal section after "after". */
7776 assert (literal_section);
7777 if (literal_section != after)
7778 {
7779 xtensa_remove_section (literal_section);
7780 xtensa_insert_section (after, literal_section);
7781 }
7782
7783 head = head->next;
7784 }
7785}
7786
7787
7788/* Push all the literal segments to the end of the gnu list. */
7789
7790void
7791xtensa_reorder_segments ()
7792{
7793 segT sec;
7794 segT last_sec;
7795 int old_count = 0;
7796 int new_count = 0;
7797
7798 for (sec = stdoutput->sections; sec != NULL; sec = sec->next)
7799 old_count++;
7800
7801 /* Now that we have the last section, push all the literal
7802 sections to the end. */
7803 last_sec = get_last_sec ();
7804 xtensa_reorder_seg_list (literal_head, last_sec);
7805 xtensa_reorder_seg_list (init_literal_head, last_sec);
7806 xtensa_reorder_seg_list (fini_literal_head, last_sec);
7807
7808 /* Now perform the final error check. */
7809 for (sec = stdoutput->sections; sec != NULL; sec = sec->next)
7810 new_count++;
7811 assert (new_count == old_count);
7812}
7813
7814
7815segT
7816get_last_sec ()
7817{
7818 segT last_sec = stdoutput->sections;
7819 while (last_sec->next != NULL)
7820 last_sec = last_sec->next;
7821
7822 return last_sec;
7823}
7824
7825
7826/* Change the emit state (seg, subseg, and frag related stuff) to the
7827 correct location. Return a emit_state which can be passed to
7828 xtensa_restore_emit_state to return to current fragment. */
7829
7830void
7831xtensa_switch_to_literal_fragment (result)
7832 emit_state *result;
7833{
7834 /* When we mark a literal pool location, we want to put a frag in
7835 the literal pool that points to it. But to do that, we want to
7836 switch_to_literal_fragment. But literal sections don't have
7837 literal pools, so their location is always null, so we would
7838 recurse forever. This is kind of hacky, but it works. */
7839
7840 static bfd_boolean recursive = FALSE;
7841 fragS *pool_location = get_literal_pool_location (now_seg);
7842 bfd_boolean is_init =
7843 (now_seg && !strcmp (segment_name (now_seg), INIT_SECTION_NAME));
7844
7845 bfd_boolean is_fini =
7846 (now_seg && !strcmp (segment_name (now_seg), FINI_SECTION_NAME));
7847
7848
7849 if (pool_location == NULL
7850 && !use_literal_section
7851 && !recursive
7852 && !is_init && ! is_fini)
7853 {
7854 as_warn (_("inlining literal pool; "
7855 "specify location with .literal_position."));
7856 recursive = TRUE;
7857 xtensa_mark_literal_pool_location (FALSE);
7858 recursive = FALSE;
7859 }
7860
7861 /* Special case: If we are in the ".fini" or ".init" section, then
7862 we will ALWAYS be generating to the ".fini.literal" and
7863 ".init.literal" sections. */
7864
7865 if (is_init)
7866 {
7867 cache_literal_section (init_literal_head,
7868 default_lit_sections.init_lit_seg_name,
7869 &default_lit_sections.init_lit_seg);
7870 xtensa_switch_section_emit_state (result,
7871 default_lit_sections.init_lit_seg, 0);
7872 }
7873 else if (is_fini)
7874 {
7875 cache_literal_section (fini_literal_head,
7876 default_lit_sections.fini_lit_seg_name,
7877 &default_lit_sections.fini_lit_seg);
7878 xtensa_switch_section_emit_state (result,
7879 default_lit_sections.fini_lit_seg, 0);
7880 }
7881 else
7882 {
7883 cache_literal_section (literal_head,
7884 default_lit_sections.lit_seg_name,
7885 &default_lit_sections.lit_seg);
7886 xtensa_switch_section_emit_state (result,
7887 default_lit_sections.lit_seg, 0);
7888 }
7889
7890 if (!use_literal_section &&
7891 !is_init && !is_fini &&
7892 get_literal_pool_location (now_seg) != pool_location)
7893 {
7894 /* Close whatever frag is there. */
7895 frag_variant (rs_fill, 0, 0, 0, NULL, 0, NULL);
7896 frag_now->tc_frag_data.literal_frag = pool_location;
7897 frag_variant (rs_fill, 0, 0, 0, NULL, 0, NULL);
7898 }
7899
7900 /* Do a 4 byte align here. */
7901 frag_align (2, 0, 0);
7902}
7903
7904
7905/* Call this function before emitting data into the literal section.
7906 This is a helper function for xtensa_switch_to_literal_fragment.
7907 This is similar to a .section new_now_seg subseg. */
7908
7909void
7910xtensa_switch_section_emit_state (state, new_now_seg, new_now_subseg)
7911 emit_state *state;
7912 segT new_now_seg;
7913 subsegT new_now_subseg;
7914{
7915 state->name = now_seg->name;
7916 state->now_seg = now_seg;
7917 state->now_subseg = now_subseg;
7918 state->generating_literals = generating_literals;
7919 generating_literals++;
7920 subseg_new (segment_name (new_now_seg), new_now_subseg);
7921}
7922
7923
7924/* Use to restore the emitting into the normal place. */
7925
7926void
7927xtensa_restore_emit_state (state)
7928 emit_state *state;
7929{
7930 generating_literals = state->generating_literals;
7931 subseg_new (state->name, state->now_subseg);
7932}
7933
7934
7935/* Get a segment of a given name. If the segment is already
7936 present, return it; otherwise, create a new one. */
7937
7938static void
7939cache_literal_section (head, name, seg)
7940 seg_list *head;
7941 const char *name;
7942 segT *seg;
7943{
7944 segT current_section = now_seg;
7945 int current_subsec = now_subseg;
7946
7947 if (*seg != 0)
7948 return;
7949 *seg = retrieve_literal_seg (head, name);
7950 subseg_set (current_section, current_subsec);
7951}
7952
7953
7954/* Get a segment of a given name. If the segment is already
7955 present, return it; otherwise, create a new one. */
7956
7957static segT
7958retrieve_literal_seg (head, name)
7959 seg_list *head;
7960 const char *name;
7961{
7962 segT ret = 0;
7963
7964 assert (head);
7965
7966 ret = seg_present (name);
7967 if (!ret)
7968 {
7969 ret = subseg_new (name, (subsegT) 0);
7970 add_seg_list (head, ret);
7971 bfd_set_section_flags (stdoutput, ret, SEC_HAS_CONTENTS |
7972 SEC_READONLY | SEC_ALLOC | SEC_LOAD | SEC_CODE);
7973 bfd_set_section_alignment (stdoutput, ret, 2);
7974 }
7975
7976 return ret;
7977}
7978
7979
7980/* Return a segment of a given name if it is present. */
7981
7982static segT
7983seg_present (name)
7984 const char *name;
7985{
7986 segT seg;
7987 seg = stdoutput->sections;
7988
7989 while (seg)
7990 {
7991 if (!strcmp (segment_name (seg), name))
7992 return seg;
7993 seg = seg->next;
7994 }
7995
7996 return 0;
7997}
7998
7999
8000/* Add a segment to a segment list. */
8001
8002static void
8003add_seg_list (head, seg)
8004 seg_list *head;
8005 segT seg;
8006{
8007 seg_list *n;
8008 n = (seg_list *) xmalloc (sizeof (seg_list));
8009 assert (n);
8010
8011 n->seg = seg;
8012 n->next = head->next;
8013 head->next = n;
8014}
8015
8016
8017
8018/* Set up Property Tables after Relaxation. */
8019
8020#define XTENSA_INSN_SEC_NAME ".xt.insn"
8021#define XTENSA_LIT_SEC_NAME ".xt.lit"
8022
8023void
8024xtensa_post_relax_hook ()
8025{
8026 xtensa_move_seg_list_to_beginning (literal_head);
8027 xtensa_move_seg_list_to_beginning (init_literal_head);
8028 xtensa_move_seg_list_to_beginning (fini_literal_head);
8029
8030 xtensa_create_property_segments (get_frag_is_insn,
8031 XTENSA_INSN_SEC_NAME,
8032 xt_literal_sec);
8033 if (use_literal_section)
8034 xtensa_create_property_segments (get_frag_is_literal,
8035 XTENSA_LIT_SEC_NAME,
8036 xt_insn_sec);
8037}
8038
8039
8040static bfd_boolean
8041get_frag_is_literal (fragP)
8042 const fragS *fragP;
8043{
8044 assert (fragP != NULL);
8045 return (fragP->tc_frag_data.is_literal);
8046}
8047
8048
8049static bfd_boolean
8050get_frag_is_insn (fragP)
8051 const fragS *fragP;
8052{
8053 assert (fragP != NULL);
8054 return (fragP->tc_frag_data.is_insn);
8055}
8056
8057
8058static void
8059xtensa_create_property_segments (property_function, section_name_base,
8060 sec_type)
8061 frag_predicate property_function;
8062 const char * section_name_base;
8063 xt_section_type sec_type;
8064{
8065 segT *seclist;
8066
8067 /* Walk over all of the current segments.
8068 Walk over each fragment
8069 For each fragment that has instructions
8070 Build an instruction record (append where possible). */
8071
8072 for (seclist = &stdoutput->sections;
8073 seclist && *seclist;
8074 seclist = &(*seclist)->next)
8075 {
8076 segT sec = *seclist;
8077 if (section_has_property (sec, property_function))
8078 {
8079 char * property_section_name =
8080 xtensa_get_property_section_name (stdoutput, sec,
8081 section_name_base);
8082 segT insn_sec = retrieve_xtensa_section (property_section_name);
8083 segment_info_type *xt_seg_info = retrieve_segment_info (insn_sec);
8084 xtensa_block_info ** xt_blocks =
8085 &xt_seg_info->tc_segment_info_data.blocks[sec_type];
8086 /* Walk over all of the frchains here and add new sections. */
8087 add_xt_block_frags (sec, insn_sec, xt_blocks, property_function);
8088 }
8089 }
8090
8091 /* Now we fill them out.... */
8092
8093 for (seclist = &stdoutput->sections;
8094 seclist && *seclist;
8095 seclist = &(*seclist)->next)
8096 {
8097 segment_info_type *seginfo;
8098 xtensa_block_info *block;
8099 segT sec = *seclist;
8100 seginfo = seg_info (sec);
8101 block = seginfo->tc_segment_info_data.blocks[sec_type];
8102
8103 if (block)
8104 {
8105 xtensa_block_info *cur_block;
8106 /* This is a section with some data. */
8107 size_t num_recs = 0;
8108 size_t rec_size;
8109
8110 for (cur_block = block; cur_block; cur_block = cur_block->next)
8111 num_recs++;
8112
8113 rec_size = num_recs * 8;
8114 bfd_set_section_size (stdoutput, sec, rec_size);
8115
8116 /* In order to make this work with the assembler, we have to
8117 build some frags and then build the "fixups" for it. It
8118 would be easier to just set the contents then set the
8119 arlents. */
8120
8121 if (num_recs)
8122 {
8123 /* Allocate a fragment and leak it. */
8124 fragS *fragP;
8125 size_t frag_size;
8126 fixS *fixes;
8127 frchainS *frchainP;
8128 size_t i;
8129 char *frag_data;
8130
8131 frag_size = sizeof (fragS) + rec_size;
8132 fragP = (fragS *) xmalloc (frag_size);
8133
8134 memset (fragP, 0, frag_size);
8135 fragP->fr_address = 0;
8136 fragP->fr_next = NULL;
8137 fragP->fr_fix = rec_size;
8138 fragP->fr_var = 0;
8139 fragP->fr_type = rs_fill;
8140 /* the rest are zeros */
8141
8142 frchainP = seginfo->frchainP;
8143 frchainP->frch_root = fragP;
8144 frchainP->frch_last = fragP;
8145
8146 fixes = (fixS *) xmalloc (sizeof (fixS) * num_recs);
8147 memset (fixes, 0, sizeof (fixS) * num_recs);
8148
8149 seginfo->fix_root = fixes;
8150 seginfo->fix_tail = &fixes[num_recs - 1];
8151 cur_block = block;
8152 frag_data = &fragP->fr_literal[0];
8153 for (i = 0; i < num_recs; i++)
8154 {
8155 fixS *fix = &fixes[i];
8156 assert (cur_block);
8157
8158 /* Write the fixup. */
8159 if (i != num_recs - 1)
8160 fix->fx_next = &fixes[i + 1];
8161 else
8162 fix->fx_next = NULL;
8163 fix->fx_size = 4;
8164 fix->fx_done = 0;
8165 fix->fx_frag = fragP;
8166 fix->fx_where = i * 8;
8167 fix->fx_addsy = section_symbol (cur_block->sec);
8168 fix->fx_offset = cur_block->offset;
8169 fix->fx_r_type = BFD_RELOC_32;
8170 fix->fx_file = "Internal Assembly";
8171 fix->fx_line = 0;
8172
8173 /* Write the length. */
8174 md_number_to_chars (&frag_data[4 + 8 * i],
8175 cur_block->size, 4);
8176 cur_block = cur_block->next;
8177 }
8178 }
8179 }
8180 }
8181}
8182
8183
8184segment_info_type *
8185retrieve_segment_info (seg)
8186 segT seg;
8187{
8188 segment_info_type *seginfo;
8189 seginfo = (segment_info_type *) bfd_get_section_userdata (stdoutput, seg);
8190 if (!seginfo)
8191 {
8192 frchainS *frchainP;
8193
8194 seginfo = (segment_info_type *) xmalloc (sizeof (*seginfo));
8195 memset ((PTR) seginfo, 0, sizeof (*seginfo));
8196 seginfo->fix_root = NULL;
8197 seginfo->fix_tail = NULL;
8198 seginfo->bfd_section = seg;
8199 seginfo->sym = 0;
8200 /* We will not be dealing with these, only our special ones. */
8201#if 0
8202 if (seg == bfd_abs_section_ptr)
8203 abs_seg_info = seginfo;
8204 else if (seg == bfd_und_section_ptr)
8205 und_seg_info = seginfo;
8206 else
8207#endif
8208 bfd_set_section_userdata (stdoutput, seg, (PTR) seginfo);
8209#if 0
8210 seg_fix_rootP = &segment_info[seg].fix_root;
8211 seg_fix_tailP = &segment_info[seg].fix_tail;
8212#endif
8213
8214 frchainP = (frchainS *) xmalloc (sizeof (frchainS));
8215 frchainP->frch_root = NULL;
8216 frchainP->frch_last = NULL;
8217 frchainP->frch_next = NULL;
8218 frchainP->frch_seg = seg;
8219 frchainP->frch_subseg = 0;
8220 frchainP->fix_root = NULL;
8221 frchainP->fix_tail = NULL;
8222 /* Do not init the objstack. */
8223 /* obstack_begin (&frchainP->frch_obstack, chunksize); */
8224 /* frchainP->frch_frag_now = fragP; */
8225 frchainP->frch_frag_now = NULL;
8226
8227 seginfo->frchainP = frchainP;
8228 }
8229
8230 return seginfo;
8231}
8232
8233
8234segT
8235retrieve_xtensa_section (sec_name)
8236 char *sec_name;
8237{
8238 bfd *abfd = stdoutput;
8239 flagword flags, out_flags, link_once_flags;
8240 segT s;
8241
8242 flags = bfd_get_section_flags (abfd, now_seg);
8243 link_once_flags = (flags & SEC_LINK_ONCE);
8244 if (link_once_flags)
8245 link_once_flags |= (flags & SEC_LINK_DUPLICATES);
8246 out_flags = (SEC_RELOC | SEC_HAS_CONTENTS | SEC_READONLY | link_once_flags);
8247
8248 s = bfd_make_section_old_way (abfd, sec_name);
8249 if (s == NULL)
8250 as_bad (_("could not create section %s"), sec_name);
8251 if (!bfd_set_section_flags (abfd, s, out_flags))
8252 as_bad (_("invalid flag combination on section %s"), sec_name);
8253
8254 return s;
8255}
8256
8257
8258bfd_boolean
8259section_has_property (sec, property_function)
8260 segT sec;
8261 frag_predicate property_function;
8262{
8263 segment_info_type *seginfo = seg_info (sec);
8264 fragS *fragP;
8265
8266 if (seginfo && seginfo->frchainP)
8267 {
8268 for (fragP = seginfo->frchainP->frch_root; fragP; fragP = fragP->fr_next)
8269 {
8270 if (property_function (fragP)
8271 && (fragP->fr_type != rs_fill || fragP->fr_fix != 0))
8272 return TRUE;
8273 }
8274 }
8275 return FALSE;
8276}
8277
8278
8279/* Two types of block sections exist right now: literal and insns. */
8280
8281void
8282add_xt_block_frags (sec, xt_block_sec, xt_block, property_function)
8283 segT sec;
8284 segT xt_block_sec;
8285 xtensa_block_info **xt_block;
8286 frag_predicate property_function;
8287{
8288 segment_info_type *seg_info;
8289 segment_info_type *xt_seg_info;
8290 bfd_vma seg_offset;
8291 fragS *fragP;
8292
8293 xt_seg_info = retrieve_segment_info (xt_block_sec);
8294 seg_info = retrieve_segment_info (sec);
8295
8296 /* Build it if needed. */
8297 while (*xt_block != NULL)
8298 xt_block = &(*xt_block)->next;
8299 /* We are either at NULL at the beginning or at the end. */
8300
8301 /* Walk through the frags. */
8302 seg_offset = 0;
8303
8304 if (seg_info->frchainP)
8305 {
8306 for (fragP = seg_info->frchainP->frch_root;
8307 fragP;
8308 fragP = fragP->fr_next)
8309 {
8310 if (property_function (fragP)
8311 && (fragP->fr_type != rs_fill || fragP->fr_fix != 0))
8312 {
8313 if (*xt_block != NULL)
8314 {
8315 if ((*xt_block)->offset + (*xt_block)->size
8316 == fragP->fr_address)
8317 (*xt_block)->size += fragP->fr_fix;
8318 else
8319 xt_block = &((*xt_block)->next);
8320 }
8321 if (*xt_block == NULL)
8322 {
8323 xtensa_block_info *new_block = (xtensa_block_info *)
8324 xmalloc (sizeof (xtensa_block_info));
8325 new_block->sec = sec;
8326 new_block->offset = fragP->fr_address;
8327 new_block->size = fragP->fr_fix;
8328 new_block->next = NULL;
8329 *xt_block = new_block;
8330 }
8331 }
8332 }
8333 }
8334}
8335
8336
8337
8338/* Instruction Stack Functions (from "xtensa-istack.h"). */
8339
8340void
8341istack_init (stack)
8342 IStack *stack;
8343{
8344 memset (stack, 0, sizeof (IStack));
8345 stack->ninsn = 0;
8346}
8347
8348
8349bfd_boolean
8350istack_empty (stack)
8351 IStack *stack;
8352{
8353 return (stack->ninsn == 0);
8354}
8355
8356
8357bfd_boolean
8358istack_full (stack)
8359 IStack *stack;
8360{
8361 return (stack->ninsn == MAX_ISTACK);
8362}
8363
8364
8365/* Return a pointer to the top IStack entry.
8366 It is an error to call this if istack_empty () is true. */
8367
8368TInsn *
8369istack_top (stack)
8370 IStack *stack;
8371{
8372 int rec = stack->ninsn - 1;
8373 assert (!istack_empty (stack));
8374 return &stack->insn[rec];
8375}
8376
8377
8378/* Add a new TInsn to an IStack.
8379 It is an error to call this if istack_full () is true. */
8380
8381void
8382istack_push (stack, insn)
8383 IStack *stack;
8384 TInsn *insn;
8385{
8386 int rec = stack->ninsn;
8387 assert (!istack_full (stack));
8388 tinsn_copy (&stack->insn[rec], insn);
8389 stack->ninsn++;
8390}
8391
8392
8393/* Clear space for the next TInsn on the IStack and return a pointer
8394 to it. It is an error to call this if istack_full () is true. */
8395
8396TInsn *
8397istack_push_space (stack)
8398 IStack *stack;
8399{
8400 int rec = stack->ninsn;
8401 TInsn *insn;
8402 assert (!istack_full (stack));
8403 insn = &stack->insn[rec];
8404 memset (insn, 0, sizeof (TInsn));
8405 stack->ninsn++;
8406 return insn;
8407}
8408
8409
8410/* Remove the last pushed instruction. It is an error to call this if
8411 istack_empty () returns true. */
8412
8413void
8414istack_pop (stack)
8415 IStack *stack;
8416{
8417 int rec = stack->ninsn - 1;
8418 assert (!istack_empty (stack));
8419 stack->ninsn--;
8420 memset (&stack->insn[rec], 0, sizeof (TInsn));
8421}
8422
8423
8424
8425/* TInsn functions. */
8426
8427void
8428tinsn_init (dst)
8429 TInsn *dst;
8430{
8431 memset (dst, 0, sizeof (TInsn));
8432}
8433
8434
8435void
8436tinsn_copy (dst, src)
8437 TInsn *dst;
8438 const TInsn *src;
8439{
8440 tinsn_init (dst);
8441 memcpy (dst, src, sizeof (TInsn));
8442}
8443
8444
8445/* Get the ``num''th token of the TInsn.
8446 It is illegal to call this if num > insn->ntoks. */
8447
8448expressionS *
8449tinsn_get_tok (insn, num)
8450 TInsn *insn;
8451 int num;
8452{
8453 assert (num < insn->ntok);
8454 return &insn->tok[num];
8455}
8456
8457
8458/* Return true if ANY of the operands in the insn are symbolic. */
8459
8460static bfd_boolean
8461tinsn_has_symbolic_operands (insn)
8462 const TInsn *insn;
8463{
8464 int i;
8465 int n = insn->ntok;
8466
8467 assert (insn->insn_type == ITYPE_INSN);
8468
8469 for (i = 0; i < n; ++i)
8470 {
8471 switch (insn->tok[i].X_op)
8472 {
8473 case O_register:
8474 case O_constant:
8475 break;
8476 default:
8477 return TRUE;
8478 }
8479 }
8480 return FALSE;
8481}
8482
8483
8484bfd_boolean
8485tinsn_has_invalid_symbolic_operands (insn)
8486 const TInsn *insn;
8487{
8488 int i;
8489 int n = insn->ntok;
8490
8491 assert (insn->insn_type == ITYPE_INSN);
8492
8493 for (i = 0; i < n; ++i)
8494 {
8495 switch (insn->tok[i].X_op)
8496 {
8497 case O_register:
8498 case O_constant:
8499 break;
8500 default:
8501 if (i == get_relaxable_immed (insn->opcode))
8502 break;
8503 as_bad (_("invalid symbolic operand %d on '%s'"),
8504 i, xtensa_opcode_name (xtensa_default_isa, insn->opcode));
8505 return TRUE;
8506 }
8507 }
8508 return FALSE;
8509}
8510
8511
8512/* For assembly code with complex expressions (e.g. subtraction),
8513 we have to build them in the literal pool so that
8514 their results are calculated correctly after relaxation.
8515 The relaxation only handles expressions that
8516 boil down to SYMBOL + OFFSET. */
8517
8518static bfd_boolean
8519tinsn_has_complex_operands (insn)
8520 const TInsn *insn;
8521{
8522 int i;
8523 int n = insn->ntok;
8524 assert (insn->insn_type == ITYPE_INSN);
8525 for (i = 0; i < n; ++i)
8526 {
8527 switch (insn->tok[i].X_op)
8528 {
8529 case O_register:
8530 case O_constant:
8531 case O_symbol:
8532 break;
8533 default:
8534 return TRUE;
8535 }
8536 }
8537 return FALSE;
8538}
8539
8540
8541/* Convert the constant operands in the t_insn to insnbuf.
8542 Return true if there is a symbol in the immediate field.
8543
8544 Before this is called,
8545 1) the number of operands are correct
8546 2) the t_insn is a ITYPE_INSN
8547 3) ONLY the relaxable_ is built
8548 4) All operands are O_constant, O_symbol. All constants fit
8549 The return value tells whether there are any remaining O_symbols. */
8550
8551static bfd_boolean
8552tinsn_to_insnbuf (t_insn, insnbuf)
8553 TInsn *t_insn;
8554 xtensa_insnbuf insnbuf;
8555{
8556 xtensa_isa isa = xtensa_default_isa;
8557 xtensa_opcode opcode = t_insn->opcode;
8558 bfd_boolean has_fixup = FALSE;
8559 int noperands = xtensa_num_operands (isa, opcode);
8560 int i;
8561 uint32 opnd_value;
8562 char *file_name;
8563 int line;
8564
8565 assert (t_insn->insn_type == ITYPE_INSN);
8566 if (noperands != t_insn->ntok)
8567 as_fatal (_("operand number mismatch"));
8568
8569 xtensa_encode_insn (isa, opcode, insnbuf);
8570
8571 for (i = 0; i < noperands; ++i)
8572 {
8573 expressionS *expr = &t_insn->tok[i];
8574 xtensa_operand operand = xtensa_get_operand (isa, opcode, i);
8575 switch (expr->X_op)
8576 {
8577 case O_register:
8578 /* The register number has already been checked in
8579 expression_maybe_register, so we don't need to check here. */
8580 opnd_value = expr->X_add_number;
8581 (void) xtensa_operand_encode (operand, &opnd_value);
8582 xtensa_operand_set_field (operand, insnbuf, opnd_value);
8583 break;
8584
8585 case O_constant:
8586 as_where (&file_name, &line);
8587 /* It is a constant and we called this function,
8588 then we have to try to fit it. */
8589 xtensa_insnbuf_set_operand (insnbuf, opcode, operand,
8590 expr->X_add_number, file_name, line);
8591 break;
8592
8593 case O_symbol:
8594 default:
8595 has_fixup = TRUE;
8596 break;
8597 }
8598 }
8599 return has_fixup;
8600}
8601
8602
8603/* Check the instruction arguments. Return true on failure. */
8604
8605bfd_boolean
8606tinsn_check_arguments (insn)
8607 const TInsn *insn;
8608{
8609 xtensa_isa isa = xtensa_default_isa;
8610 xtensa_opcode opcode = insn->opcode;
8611
8612 if (opcode == XTENSA_UNDEFINED)
8613 {
8614 as_bad (_("invalid opcode"));
8615 return TRUE;
8616 }
8617
8618 if (xtensa_num_operands (isa, opcode) > insn->ntok)
8619 {
8620 as_bad (_("too few operands"));
8621 return TRUE;
8622 }
8623
8624 if (xtensa_num_operands (isa, opcode) < insn->ntok)
8625 {
8626 as_bad (_("too many operands"));
8627 return TRUE;
8628 }
8629 return FALSE;
8630}
8631
8632
8633/* Load an instruction from its encoded form. */
8634
8635static void
8636tinsn_from_chars (t_insn, f)
8637 TInsn *t_insn;
8638 char *f;
8639{
8640 static xtensa_insnbuf insnbuf = NULL;
8641 int i;
8642 xtensa_opcode opcode;
8643 xtensa_isa isa = xtensa_default_isa;
8644
8645 if (!insnbuf)
8646 insnbuf = xtensa_insnbuf_alloc (isa);
8647
8648 xtensa_insnbuf_from_chars (isa, insnbuf, f);
8649 opcode = xtensa_decode_insn (isa, insnbuf);
8650
8651 /* Find the immed. */
8652 tinsn_init (t_insn);
8653 t_insn->insn_type = ITYPE_INSN;
8654 t_insn->is_specific_opcode = FALSE; /* Must not be specific. */
8655 t_insn->opcode = opcode;
8656 t_insn->ntok = xtensa_num_operands (isa, opcode);
8657 for (i = 0; i < t_insn->ntok; i++)
8658 {
8659 set_expr_const (&t_insn->tok[i],
8660 xtensa_insnbuf_get_operand (insnbuf, opcode, i));
8661 }
8662}
8663
8664
8665/* Read the value of the relaxable immed from the fr_symbol and fr_offset. */
8666
8667static void
8668tinsn_immed_from_frag (t_insn, fragP)
8669 TInsn *t_insn;
8670 fragS *fragP;
8671{
8672 xtensa_opcode opcode = t_insn->opcode;
8673 int opnum;
8674
8675 if (fragP->fr_symbol)
8676 {
8677 opnum = get_relaxable_immed (opcode);
8678 set_expr_symbol_offset (&t_insn->tok[opnum],
8679 fragP->fr_symbol, fragP->fr_offset);
8680 }
8681}
8682
8683
8684static int
8685get_num_stack_text_bytes (istack)
8686 IStack *istack;
8687{
8688 int i;
8689 int text_bytes = 0;
8690
8691 for (i = 0; i < istack->ninsn; i++)
8692 {
8693 TInsn *t_insn = &istack->insn[i];
8694 if (t_insn->insn_type == ITYPE_INSN)
8695 text_bytes += xg_get_insn_size (t_insn);
8696 }
8697 return text_bytes;
8698}
8699
8700
8701static int
8702get_num_stack_literal_bytes (istack)
8703 IStack *istack;
8704{
8705 int i;
8706 int lit_bytes = 0;
8707
8708 for (i = 0; i < istack->ninsn; i++)
8709 {
8710 TInsn *t_insn = &istack->insn[i];
8711
8712 if (t_insn->insn_type == ITYPE_LITERAL && t_insn->ntok == 1)
8713 lit_bytes += 4;
8714 }
8715 return lit_bytes;
8716}
8717
8718
8719
8720/* Expression utilities. */
8721
8722/* Return true if the expression is an integer constant. */
8723
8724bfd_boolean
8725expr_is_const (s)
8726 const expressionS *s;
8727{
8728 return (s->X_op == O_constant);
8729}
8730
8731
8732/* Get the expression constant.
8733 Calling this is illegal if expr_is_const () returns true. */
8734
8735offsetT
8736get_expr_const (s)
8737 const expressionS *s;
8738{
8739 assert (expr_is_const (s));
8740 return s->X_add_number;
8741}
8742
8743
8744/* Set the expression to a constant value. */
8745
8746void
8747set_expr_const (s, val)
8748 expressionS *s;
8749 offsetT val;
8750{
8751 s->X_op = O_constant;
8752 s->X_add_number = val;
8753 s->X_add_symbol = NULL;
8754 s->X_op_symbol = NULL;
8755}
8756
8757
8758/* Set the expression to a symbol + constant offset. */
8759
8760void
8761set_expr_symbol_offset (s, sym, offset)
8762 expressionS *s;
8763 symbolS *sym;
8764 offsetT offset;
8765{
8766 s->X_op = O_symbol;
8767 s->X_add_symbol = sym;
8768 s->X_op_symbol = NULL; /* unused */
8769 s->X_add_number = offset;
8770}
8771
8772
8773bfd_boolean
8774expr_is_equal (s1, s2)
8775 expressionS *s1;
8776 expressionS *s2;
8777{
8778 if (s1->X_op != s2->X_op)
8779 return FALSE;
8780 if (s1->X_add_symbol != s2->X_add_symbol)
8781 return FALSE;
8782 if (s1->X_op_symbol != s2->X_op_symbol)
8783 return FALSE;
8784 if (s1->X_add_number != s2->X_add_number)
8785 return FALSE;
8786 return TRUE;
8787}
8788
8789
8790static void
8791copy_expr (dst, src)
8792 expressionS *dst;
8793 const expressionS *src;
8794{
8795 memcpy (dst, src, sizeof (expressionS));
8796}
8797
8798
8799
8800/* Support for Tensilica's "--rename-section" option. */
8801
8802#ifdef XTENSA_SECTION_RENAME
8803
8804struct rename_section_struct
8805{
8806 char *old_name;
8807 char *new_name;
8808 struct rename_section_struct *next;
8809};
8810
8811static struct rename_section_struct *section_rename;
8812
8813
8814/* Parse the string oldname=new_name:oldname2=new_name2
8815 and call add_section_rename. */
8816
8817void
8818build_section_rename (arg)
8819 const char *arg;
8820{
8821 char *this_arg = NULL;
8822 char *next_arg = NULL;
8823
8824 for (this_arg = strdup (arg); this_arg != NULL; this_arg = next_arg)
8825 {
8826 if (this_arg)
8827 {
8828 next_arg = strchr (this_arg, ':');
8829 if (next_arg)
8830 {
8831 *next_arg = '\0';
8832 next_arg++;
8833 }
8834 }
8835 {
8836 char *old_name = this_arg;
8837 char *new_name = strchr (this_arg, '=');
8838
8839 if (*old_name == '\0')
8840 {
8841 as_warn (_("ignoring extra '-rename-section' delimiter ':'"));
8842 continue;
8843 }
8844 if (!new_name || new_name[1] == '\0')
8845 {
8846 as_warn (_("ignoring invalid '-rename-section' "
8847 "specification: '%s'"), old_name);
8848 continue;
8849 }
8850 *new_name = '\0';
8851 new_name++;
8852 add_section_rename (old_name, new_name);
8853 }
8854 }
8855}
8856
8857
8858static void
8859add_section_rename (old_name, new_name)
8860 char *old_name;
8861 char *new_name;
8862{
8863 struct rename_section_struct *r = section_rename;
8864
8865 /* Check for invalid section renaming. */
8866 for (r = section_rename; r != NULL; r = r->next)
8867 {
8868 if (strcmp (r->old_name, old_name) == 0)
8869 as_bad (_("section %s renamed multiple times"), old_name);
8870 if (strcmp (r->new_name, new_name) == 0)
8871 as_bad (_("multiple sections remapped to output section %s"),
8872 new_name);
8873 }
8874
8875 /* Now add it. */
8876 r = (struct rename_section_struct *)
8877 xmalloc (sizeof (struct rename_section_struct));
8878 r->old_name = strdup (old_name);
8879 r->new_name = strdup (new_name);
8880 r->next = section_rename;
8881 section_rename = r;
8882}
8883
8884
8885const char *
8886xtensa_section_rename (name)
8887 const char *name;
8888{
8889 struct rename_section_struct *r = section_rename;
8890
8891 for (r = section_rename; r != NULL; r = r->next)
8892 if (strcmp (r->old_name, name) == 0)
8893 return r->new_name;
8894
8895 return name;
8896}
8897
8898#endif /* XTENSA_SECTION_RENAME */
8899
8900
8901
8902/* Combining identical literals. */
8903
8904#ifdef XTENSA_COMBINE_LITERALS
8905
8906/* This code records all the .literal values that are ever seen and
8907 detects duplicates so that identical values can be combined. This
8908 is currently disabled because it's only half-baked. */
8909
8910#define XTENSA_LIT_PLUS_OFFSET ".xtensa_litsym_offset_"
8911
8912/* TODO: make this into a more efficient data structure. */
8913typedef struct literal_list_elem
8914{
8915 symbolS *sym; /* The symbol that points to this literal. */
8916 expressionS expr; /* The expression. */
8917 segT seg;
8918 struct literal_list_elem *next; /* Next in the list. */
8919} literal_list_elem;
8920
8921literal_list_elem *lit_cache = NULL;
8922
8923typedef struct lit_sym_translation
8924{
8925 char *name; /* This name. */
8926 offsetT offset; /* Plus this offset. */
8927 symbolS *sym; /* Should really mean this symbol. */
8928 struct lit_sym_translation *next;
8929} lit_sym_translation;
8930
8931lit_sym_translation *translations = NULL;
8932
8933static bfd_boolean is_duplicate_expression
8934 PARAMS ((expressionS *, expressionS *));
8935static void cache_literal
8936 PARAMS ((char *sym_name, expressionS *, segT));
8937static symbolS *is_duplicate_literal
8938 PARAMS ((expressionS *, segT));
8939
8940
8941static bfd_boolean
8942is_duplicate_expression (e1, e2)
8943 expressionS *e1;
8944 expressionS *e2;
8945{
8946 if (e1->X_op != e2->X_op)
8947 return FALSE;
8948 if (e1->X_add_symbol != e2->X_add_symbol)
8949 return FALSE;
8950 if (e1->X_op_symbol != e2->X_op_symbol)
8951 return FALSE;
8952 if (e1->X_add_number != e2->X_add_number)
8953 return FALSE;
8954 if (e1->X_unsigned != e2->X_unsigned)
8955 return FALSE;
8956 if (e1->X_md != e2->X_md)
8957 return FALSE;
8958 return TRUE;
8959}
8960
8961
8962static void
8963cache_literal (sym_name, expP, seg)
8964 char *sym_name;
8965 expressionS *expP;
8966 segT seg;
8967{
8968 literal_list_elem *lit = xmalloc (sizeof (literal_list_elem));
8969
8970 lit->sym = symbol_find (sym_name);
8971 lit->expr = *expP;
8972 lit->seg = seg;
8973 lit->next = lit_cache;
8974 lit_cache = lit;
8975}
8976
8977
8978static symbolS *
8979is_duplicate_literal (expr, seg)
8980 expressionS *expr;
8981 segT seg;
8982{
8983 literal_list_elem *lit = lit_cache;
8984
8985 while (lit != NULL)
8986 {
8987 if (is_duplicate_expression (&lit->expr, expr) && seg == lit->seg)
8988 return lit->sym;
8989 lit = lit->next;
8990 }
8991
8992 return NULL;
8993}
8994
8995
8996static void
8997add_lit_sym_translation (name, offset, target)
8998 char * name;
8999 offsetT offset;
9000 symbolS * target;
9001{
9002 lit_sym_translation *lit_trans = xmalloc (sizeof (lit_sym_translation));
9003
9004 lit_trans->name = name;
9005 lit_trans->offset = offset;
9006 lit_trans->sym = target;
9007 lit_trans->next = translations;
9008 translations = lit_trans;
9009}
9010
9011
9012static void
9013find_lit_sym_translation (expr)
9014 expressionS *expr;
9015{
9016 lit_sym_translation *lit_trans = translations;
9017
9018 if (expr->X_op != O_symbol)
9019 return;
9020
9021 while (lit_trans != NULL)
9022 {
9023 if (lit_trans->offset == expr->X_add_number
9024 && strcmp (lit_trans->name, S_GET_NAME (expr->X_add_symbol)) == 0)
9025 {
9026 expr->X_add_symbol = lit_trans->sym;
9027 expr->X_add_number = 0;
9028 return;
9029 }
9030 lit_trans = lit_trans->next;
9031 }
9032}
9033
9034#endif /* XTENSA_COMBINE_LITERALS */
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