source: vendor/binutils/current/opcodes/openrisc-asm.c

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1/* Assembler interface for targets using CGEN. -*- C -*-
2 CGEN: Cpu tools GENerator
3
4THIS FILE IS MACHINE GENERATED WITH CGEN.
5- the resultant file is machine generated, cgen-asm.in isn't
6
7Copyright 1996, 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
8
9This file is part of the GNU Binutils and GDB, the GNU debugger.
10
11This program is free software; you can redistribute it and/or modify
12it under the terms of the GNU General Public License as published by
13the Free Software Foundation; either version 2, or (at your option)
14any later version.
15
16This program is distributed in the hope that it will be useful,
17but WITHOUT ANY WARRANTY; without even the implied warranty of
18MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19GNU General Public License for more details.
20
21You should have received a copy of the GNU General Public License
22along with this program; if not, write to the Free Software Foundation, Inc.,
2359 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
24
25/* ??? Eventually more and more of this stuff can go to cpu-independent files.
26 Keep that in mind. */
27
28#include "sysdep.h"
29#include <stdio.h>
30#include "ansidecl.h"
31#include "bfd.h"
32#include "symcat.h"
33#include "openrisc-desc.h"
34#include "openrisc-opc.h"
35#include "opintl.h"
36#include "xregex.h"
37#include "libiberty.h"
38#include "safe-ctype.h"
39
40#undef min
41#define min(a,b) ((a) < (b) ? (a) : (b))
42#undef max
43#define max(a,b) ((a) > (b) ? (a) : (b))
44
45static const char * parse_insn_normal
46 PARAMS ((CGEN_CPU_DESC, const CGEN_INSN *, const char **, CGEN_FIELDS *));
47
48
49/* -- assembler routines inserted here. */
50
51/* -- asm.c */
52
53#define CGEN_VERBOSE_ASSEMBLER_ERRORS
54
55static const char * parse_hi16
56 PARAMS ((CGEN_CPU_DESC, const char **, int, unsigned long *));
57static const char * parse_lo16
58 PARAMS ((CGEN_CPU_DESC, const char **, int, unsigned long *));
59
60long
61openrisc_sign_extend_16bit (value)
62 long value;
63{
64 return (long) (short) value;
65}
66
67/* Handle hi(). */
68
69static const char *
70parse_hi16 (cd, strp, opindex, valuep)
71 CGEN_CPU_DESC cd;
72 const char **strp;
73 int opindex;
74 unsigned long *valuep;
75{
76 const char *errmsg;
77 enum cgen_parse_operand_result result_type;
78 bfd_vma value;
79
80 if (**strp == '#')
81 ++*strp;
82
83 if (strncasecmp (*strp, "hi(", 3) == 0)
84 {
85 *strp += 3;
86
87#if 0
88 errmsg = cgen_parse_signed_integer (cd, strp, opindex, valuep);
89 if (errmsg != NULL)
90 fprintf (stderr, "parse_hi: %s\n", errmsg);
91 if (errmsg != NULL)
92#endif
93 errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_HI16,
94 &result_type, &value);
95 if (**strp != ')')
96 return "missing `)'";
97 ++*strp;
98 if (errmsg == NULL
99 && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
100 value >>= 16;
101 *valuep = (long) (short) value;
102
103 return errmsg;
104 }
105 else
106 {
107 if (**strp == '-')
108 errmsg = cgen_parse_signed_integer (cd, strp, opindex, (long *) &value);
109 else
110 errmsg = cgen_parse_unsigned_integer (cd, strp, opindex, (unsigned long *) &value);
111 }
112 *valuep = (long) (short) (value & 0xffff);
113 return errmsg;
114}
115
116/* Handle lo(). */
117
118static const char *
119parse_lo16 (cd, strp, opindex, valuep)
120 CGEN_CPU_DESC cd;
121 const char **strp;
122 int opindex;
123 unsigned long *valuep;
124{
125 const char *errmsg;
126 enum cgen_parse_operand_result result_type;
127 bfd_vma value;
128
129 if (**strp == '#')
130 ++*strp;
131
132 if (strncasecmp (*strp, "lo(", 3) == 0)
133 {
134 *strp += 3;
135
136#if 0
137 errmsg = cgen_parse_signed_integer (cd, strp, opindex, valuep);
138 if (errmsg != NULL)
139 fprintf (stderr, "parse_lo: %s\n", errmsg);
140
141 if (errmsg != NULL)
142#endif
143 errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_LO16,
144 &result_type, &value);
145 if (**strp != ')')
146 return "missing `)'";
147 ++*strp;
148 if (errmsg == NULL
149 && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
150 value &= 0xffff;
151 *valuep = (long) (short) value;
152
153 return errmsg;
154 }
155
156 if (**strp == '-')
157 errmsg = cgen_parse_signed_integer (cd, strp, opindex, (long *) &value);
158 else
159 errmsg = cgen_parse_unsigned_integer (cd, strp, opindex, (unsigned long *) &value);
160 *valuep = (long) (short) (value & 0xffff);
161 return errmsg;
162}
163
164/* -- */
165
166const char * openrisc_cgen_parse_operand
167 PARAMS ((CGEN_CPU_DESC, int, const char **, CGEN_FIELDS *));
168
169/* Main entry point for operand parsing.
170
171 This function is basically just a big switch statement. Earlier versions
172 used tables to look up the function to use, but
173 - if the table contains both assembler and disassembler functions then
174 the disassembler contains much of the assembler and vice-versa,
175 - there's a lot of inlining possibilities as things grow,
176 - using a switch statement avoids the function call overhead.
177
178 This function could be moved into `parse_insn_normal', but keeping it
179 separate makes clear the interface between `parse_insn_normal' and each of
180 the handlers. */
181
182const char *
183openrisc_cgen_parse_operand (cd, opindex, strp, fields)
184 CGEN_CPU_DESC cd;
185 int opindex;
186 const char ** strp;
187 CGEN_FIELDS * fields;
188{
189 const char * errmsg = NULL;
190 /* Used by scalar operands that still need to be parsed. */
191 long junk ATTRIBUTE_UNUSED;
192
193 switch (opindex)
194 {
195 case OPENRISC_OPERAND_ABS_26 :
196 {
197 bfd_vma value;
198 errmsg = cgen_parse_address (cd, strp, OPENRISC_OPERAND_ABS_26, 0, NULL, & value);
199 fields->f_abs26 = value;
200 }
201 break;
202 case OPENRISC_OPERAND_DISP_26 :
203 {
204 bfd_vma value;
205 errmsg = cgen_parse_address (cd, strp, OPENRISC_OPERAND_DISP_26, 0, NULL, & value);
206 fields->f_disp26 = value;
207 }
208 break;
209 case OPENRISC_OPERAND_HI16 :
210 errmsg = parse_hi16 (cd, strp, OPENRISC_OPERAND_HI16, &fields->f_simm16);
211 break;
212 case OPENRISC_OPERAND_LO16 :
213 errmsg = parse_lo16 (cd, strp, OPENRISC_OPERAND_LO16, &fields->f_lo16);
214 break;
215 case OPENRISC_OPERAND_OP_F_23 :
216 errmsg = cgen_parse_unsigned_integer (cd, strp, OPENRISC_OPERAND_OP_F_23, &fields->f_op4);
217 break;
218 case OPENRISC_OPERAND_OP_F_3 :
219 errmsg = cgen_parse_unsigned_integer (cd, strp, OPENRISC_OPERAND_OP_F_3, &fields->f_op5);
220 break;
221 case OPENRISC_OPERAND_RA :
222 errmsg = cgen_parse_keyword (cd, strp, & openrisc_cgen_opval_h_gr, & fields->f_r2);
223 break;
224 case OPENRISC_OPERAND_RB :
225 errmsg = cgen_parse_keyword (cd, strp, & openrisc_cgen_opval_h_gr, & fields->f_r3);
226 break;
227 case OPENRISC_OPERAND_RD :
228 errmsg = cgen_parse_keyword (cd, strp, & openrisc_cgen_opval_h_gr, & fields->f_r1);
229 break;
230 case OPENRISC_OPERAND_SIMM_16 :
231 errmsg = cgen_parse_signed_integer (cd, strp, OPENRISC_OPERAND_SIMM_16, &fields->f_simm16);
232 break;
233 case OPENRISC_OPERAND_UI16NC :
234 errmsg = parse_lo16 (cd, strp, OPENRISC_OPERAND_UI16NC, &fields->f_i16nc);
235 break;
236 case OPENRISC_OPERAND_UIMM_16 :
237 errmsg = cgen_parse_unsigned_integer (cd, strp, OPENRISC_OPERAND_UIMM_16, &fields->f_uimm16);
238 break;
239 case OPENRISC_OPERAND_UIMM_5 :
240 errmsg = cgen_parse_unsigned_integer (cd, strp, OPENRISC_OPERAND_UIMM_5, &fields->f_uimm5);
241 break;
242
243 default :
244 /* xgettext:c-format */
245 fprintf (stderr, _("Unrecognized field %d while parsing.\n"), opindex);
246 abort ();
247 }
248
249 return errmsg;
250}
251
252cgen_parse_fn * const openrisc_cgen_parse_handlers[] =
253{
254 parse_insn_normal,
255};
256
257void
258openrisc_cgen_init_asm (cd)
259 CGEN_CPU_DESC cd;
260{
261 openrisc_cgen_init_opcode_table (cd);
262 openrisc_cgen_init_ibld_table (cd);
263 cd->parse_handlers = & openrisc_cgen_parse_handlers[0];
264 cd->parse_operand = openrisc_cgen_parse_operand;
265}
266
267
268
269
270/* Regex construction routine.
271
272 This translates an opcode syntax string into a regex string,
273 by replacing any non-character syntax element (such as an
274 opcode) with the pattern '.*'
275
276 It then compiles the regex and stores it in the opcode, for
277 later use by openrisc_cgen_assemble_insn
278
279 Returns NULL for success, an error message for failure. */
280
281char *
282openrisc_cgen_build_insn_regex (insn)
283 CGEN_INSN *insn;
284{
285 CGEN_OPCODE *opc = (CGEN_OPCODE *) CGEN_INSN_OPCODE (insn);
286 const char *mnem = CGEN_INSN_MNEMONIC (insn);
287 char rxbuf[CGEN_MAX_RX_ELEMENTS];
288 char *rx = rxbuf;
289 const CGEN_SYNTAX_CHAR_TYPE *syn;
290 int reg_err;
291
292 syn = CGEN_SYNTAX_STRING (CGEN_OPCODE_SYNTAX (opc));
293
294 /* Mnemonics come first in the syntax string. */
295 if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
296 return _("missing mnemonic in syntax string");
297 ++syn;
298
299 /* Generate a case sensitive regular expression that emulates case
300 insensitive matching in the "C" locale. We cannot generate a case
301 insensitive regular expression because in Turkish locales, 'i' and 'I'
302 are not equal modulo case conversion. */
303
304 /* Copy the literal mnemonic out of the insn. */
305 for (; *mnem; mnem++)
306 {
307 char c = *mnem;
308
309 if (ISALPHA (c))
310 {
311 *rx++ = '[';
312 *rx++ = TOLOWER (c);
313 *rx++ = TOUPPER (c);
314 *rx++ = ']';
315 }
316 else
317 *rx++ = c;
318 }
319
320 /* Copy any remaining literals from the syntax string into the rx. */
321 for(; * syn != 0 && rx <= rxbuf + (CGEN_MAX_RX_ELEMENTS - 7 - 4); ++syn)
322 {
323 if (CGEN_SYNTAX_CHAR_P (* syn))
324 {
325 char c = CGEN_SYNTAX_CHAR (* syn);
326
327 switch (c)
328 {
329 /* Escape any regex metacharacters in the syntax. */
330 case '.': case '[': case '\\':
331 case '*': case '^': case '$':
332
333#ifdef CGEN_ESCAPE_EXTENDED_REGEX
334 case '?': case '{': case '}':
335 case '(': case ')': case '*':
336 case '|': case '+': case ']':
337#endif
338 *rx++ = '\\';
339 *rx++ = c;
340 break;
341
342 default:
343 if (ISALPHA (c))
344 {
345 *rx++ = '[';
346 *rx++ = TOLOWER (c);
347 *rx++ = TOUPPER (c);
348 *rx++ = ']';
349 }
350 else
351 *rx++ = c;
352 break;
353 }
354 }
355 else
356 {
357 /* Replace non-syntax fields with globs. */
358 *rx++ = '.';
359 *rx++ = '*';
360 }
361 }
362
363 /* Trailing whitespace ok. */
364 * rx++ = '[';
365 * rx++ = ' ';
366 * rx++ = '\t';
367 * rx++ = ']';
368 * rx++ = '*';
369
370 /* But anchor it after that. */
371 * rx++ = '$';
372 * rx = '\0';
373
374 CGEN_INSN_RX (insn) = xmalloc (sizeof (regex_t));
375 reg_err = regcomp ((regex_t *) CGEN_INSN_RX (insn), rxbuf, REG_NOSUB);
376
377 if (reg_err == 0)
378 return NULL;
379 else
380 {
381 static char msg[80];
382
383 regerror (reg_err, (regex_t *) CGEN_INSN_RX (insn), msg, 80);
384 regfree ((regex_t *) CGEN_INSN_RX (insn));
385 free (CGEN_INSN_RX (insn));
386 (CGEN_INSN_RX (insn)) = NULL;
387 return msg;
388 }
389}
390
391
392
393/* Default insn parser.
394
395 The syntax string is scanned and operands are parsed and stored in FIELDS.
396 Relocs are queued as we go via other callbacks.
397
398 ??? Note that this is currently an all-or-nothing parser. If we fail to
399 parse the instruction, we return 0 and the caller will start over from
400 the beginning. Backtracking will be necessary in parsing subexpressions,
401 but that can be handled there. Not handling backtracking here may get
402 expensive in the case of the m68k. Deal with later.
403
404 Returns NULL for success, an error message for failure. */
405
406static const char *
407parse_insn_normal (cd, insn, strp, fields)
408 CGEN_CPU_DESC cd;
409 const CGEN_INSN *insn;
410 const char **strp;
411 CGEN_FIELDS *fields;
412{
413 /* ??? Runtime added insns not handled yet. */
414 const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
415 const char *str = *strp;
416 const char *errmsg;
417 const char *p;
418 const CGEN_SYNTAX_CHAR_TYPE * syn;
419#ifdef CGEN_MNEMONIC_OPERANDS
420 /* FIXME: wip */
421 int past_opcode_p;
422#endif
423
424 /* For now we assume the mnemonic is first (there are no leading operands).
425 We can parse it without needing to set up operand parsing.
426 GAS's input scrubber will ensure mnemonics are lowercase, but we may
427 not be called from GAS. */
428 p = CGEN_INSN_MNEMONIC (insn);
429 while (*p && TOLOWER (*p) == TOLOWER (*str))
430 ++p, ++str;
431
432 if (* p)
433 return _("unrecognized instruction");
434
435#ifndef CGEN_MNEMONIC_OPERANDS
436 if (* str && ! ISSPACE (* str))
437 return _("unrecognized instruction");
438#endif
439
440 CGEN_INIT_PARSE (cd);
441 cgen_init_parse_operand (cd);
442#ifdef CGEN_MNEMONIC_OPERANDS
443 past_opcode_p = 0;
444#endif
445
446 /* We don't check for (*str != '\0') here because we want to parse
447 any trailing fake arguments in the syntax string. */
448 syn = CGEN_SYNTAX_STRING (syntax);
449
450 /* Mnemonics come first for now, ensure valid string. */
451 if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
452 abort ();
453
454 ++syn;
455
456 while (* syn != 0)
457 {
458 /* Non operand chars must match exactly. */
459 if (CGEN_SYNTAX_CHAR_P (* syn))
460 {
461 /* FIXME: While we allow for non-GAS callers above, we assume the
462 first char after the mnemonic part is a space. */
463 /* FIXME: We also take inappropriate advantage of the fact that
464 GAS's input scrubber will remove extraneous blanks. */
465 if (TOLOWER (*str) == TOLOWER (CGEN_SYNTAX_CHAR (* syn)))
466 {
467#ifdef CGEN_MNEMONIC_OPERANDS
468 if (CGEN_SYNTAX_CHAR(* syn) == ' ')
469 past_opcode_p = 1;
470#endif
471 ++ syn;
472 ++ str;
473 }
474 else if (*str)
475 {
476 /* Syntax char didn't match. Can't be this insn. */
477 static char msg [80];
478
479 /* xgettext:c-format */
480 sprintf (msg, _("syntax error (expected char `%c', found `%c')"),
481 CGEN_SYNTAX_CHAR(*syn), *str);
482 return msg;
483 }
484 else
485 {
486 /* Ran out of input. */
487 static char msg [80];
488
489 /* xgettext:c-format */
490 sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"),
491 CGEN_SYNTAX_CHAR(*syn));
492 return msg;
493 }
494 continue;
495 }
496
497 /* We have an operand of some sort. */
498 errmsg = cd->parse_operand (cd, CGEN_SYNTAX_FIELD (*syn),
499 &str, fields);
500 if (errmsg)
501 return errmsg;
502
503 /* Done with this operand, continue with next one. */
504 ++ syn;
505 }
506
507 /* If we're at the end of the syntax string, we're done. */
508 if (* syn == 0)
509 {
510 /* FIXME: For the moment we assume a valid `str' can only contain
511 blanks now. IE: We needn't try again with a longer version of
512 the insn and it is assumed that longer versions of insns appear
513 before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3). */
514 while (ISSPACE (* str))
515 ++ str;
516
517 if (* str != '\0')
518 return _("junk at end of line"); /* FIXME: would like to include `str' */
519
520 return NULL;
521 }
522
523 /* We couldn't parse it. */
524 return _("unrecognized instruction");
525}
526
527
528/* Main entry point.
529 This routine is called for each instruction to be assembled.
530 STR points to the insn to be assembled.
531 We assume all necessary tables have been initialized.
532 The assembled instruction, less any fixups, is stored in BUF.
533 Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value
534 still needs to be converted to target byte order, otherwise BUF is an array
535 of bytes in target byte order.
536 The result is a pointer to the insn's entry in the opcode table,
537 or NULL if an error occured (an error message will have already been
538 printed).
539
540 Note that when processing (non-alias) macro-insns,
541 this function recurses.
542
543 ??? It's possible to make this cpu-independent.
544 One would have to deal with a few minor things.
545 At this point in time doing so would be more of a curiosity than useful
546 [for example this file isn't _that_ big], but keeping the possibility in
547 mind helps keep the design clean. */
548
549const CGEN_INSN *
550openrisc_cgen_assemble_insn (cd, str, fields, buf, errmsg)
551 CGEN_CPU_DESC cd;
552 const char *str;
553 CGEN_FIELDS *fields;
554 CGEN_INSN_BYTES_PTR buf;
555 char **errmsg;
556{
557 const char *start;
558 CGEN_INSN_LIST *ilist;
559 const char *parse_errmsg = NULL;
560 const char *insert_errmsg = NULL;
561 int recognized_mnemonic = 0;
562
563 /* Skip leading white space. */
564 while (ISSPACE (* str))
565 ++ str;
566
567 /* The instructions are stored in hashed lists.
568 Get the first in the list. */
569 ilist = CGEN_ASM_LOOKUP_INSN (cd, str);
570
571 /* Keep looking until we find a match. */
572 start = str;
573 for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist))
574 {
575 const CGEN_INSN *insn = ilist->insn;
576 recognized_mnemonic = 1;
577
578#ifdef CGEN_VALIDATE_INSN_SUPPORTED
579 /* Not usually needed as unsupported opcodes
580 shouldn't be in the hash lists. */
581 /* Is this insn supported by the selected cpu? */
582 if (! openrisc_cgen_insn_supported (cd, insn))
583 continue;
584#endif
585 /* If the RELAX attribute is set, this is an insn that shouldn't be
586 chosen immediately. Instead, it is used during assembler/linker
587 relaxation if possible. */
588 if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAX) != 0)
589 continue;
590
591 str = start;
592
593 /* Skip this insn if str doesn't look right lexically. */
594 if (CGEN_INSN_RX (insn) != NULL &&
595 regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH)
596 continue;
597
598 /* Allow parse/insert handlers to obtain length of insn. */
599 CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
600
601 parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields);
602 if (parse_errmsg != NULL)
603 continue;
604
605 /* ??? 0 is passed for `pc'. */
606 insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf,
607 (bfd_vma) 0);
608 if (insert_errmsg != NULL)
609 continue;
610
611 /* It is up to the caller to actually output the insn and any
612 queued relocs. */
613 return insn;
614 }
615
616 {
617 static char errbuf[150];
618#ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS
619 const char *tmp_errmsg;
620
621 /* If requesting verbose error messages, use insert_errmsg.
622 Failing that, use parse_errmsg. */
623 tmp_errmsg = (insert_errmsg ? insert_errmsg :
624 parse_errmsg ? parse_errmsg :
625 recognized_mnemonic ?
626 _("unrecognized form of instruction") :
627 _("unrecognized instruction"));
628
629 if (strlen (start) > 50)
630 /* xgettext:c-format */
631 sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start);
632 else
633 /* xgettext:c-format */
634 sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start);
635#else
636 if (strlen (start) > 50)
637 /* xgettext:c-format */
638 sprintf (errbuf, _("bad instruction `%.50s...'"), start);
639 else
640 /* xgettext:c-format */
641 sprintf (errbuf, _("bad instruction `%.50s'"), start);
642#endif
643
644 *errmsg = errbuf;
645 return NULL;
646 }
647}
648
649
650#if 0 /* This calls back to GAS which we can't do without care. */
651
652/* Record each member of OPVALS in the assembler's symbol table.
653 This lets GAS parse registers for us.
654 ??? Interesting idea but not currently used. */
655
656/* Record each member of OPVALS in the assembler's symbol table.
657 FIXME: Not currently used. */
658
659void
660openrisc_cgen_asm_hash_keywords (cd, opvals)
661 CGEN_CPU_DESC cd;
662 CGEN_KEYWORD *opvals;
663{
664 CGEN_KEYWORD_SEARCH search = cgen_keyword_search_init (opvals, NULL);
665 const CGEN_KEYWORD_ENTRY * ke;
666
667 while ((ke = cgen_keyword_search_next (& search)) != NULL)
668 {
669#if 0 /* Unnecessary, should be done in the search routine. */
670 if (! openrisc_cgen_opval_supported (ke))
671 continue;
672#endif
673 cgen_asm_record_register (cd, ke->name, ke->value);
674 }
675}
676
677#endif /* 0 */
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