source: trunk/src/binutils/bfd/elf32-m68hc12.c@ 1036

Last change on this file since 1036 was 610, checked in by bird, 22 years ago

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1/* Motorola 68HC12-specific support for 32-bit ELF
2 Copyright 1999, 2000, 2002, 2003 Free Software Foundation, Inc.
3 Contributed by Stephane Carrez (stcarrez@nerim.fr)
4 (Heavily copied from the D10V port by Martin Hunt (hunt@cygnus.com))
5
6This file is part of BFD, the Binary File Descriptor library.
7
8This program is free software; you can redistribute it and/or modify
9it under the terms of the GNU General Public License as published by
10the Free Software Foundation; either version 2 of the License, or
11(at your option) any later version.
12
13This program is distributed in the hope that it will be useful,
14but WITHOUT ANY WARRANTY; without even the implied warranty of
15MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16GNU General Public License for more details.
17
18You should have received a copy of the GNU General Public License
19along with this program; if not, write to the Free Software
20Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21
22#include "bfd.h"
23#include "sysdep.h"
24#include "bfdlink.h"
25#include "libbfd.h"
26#include "elf-bfd.h"
27#include "elf32-m68hc1x.h"
28#include "elf/m68hc11.h"
29#include "opcode/m68hc11.h"
30
31/* Relocation functions. */
32static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup
33 PARAMS ((bfd *, bfd_reloc_code_real_type));
34static void m68hc11_info_to_howto_rel
35 PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
36
37/* Trampoline generation. */
38static bfd_boolean m68hc12_elf_size_one_stub
39 PARAMS((struct bfd_hash_entry *gen_entry, PTR in_arg));
40static bfd_boolean m68hc12_elf_build_one_stub
41 PARAMS((struct bfd_hash_entry *gen_entry, PTR in_arg));
42static struct bfd_link_hash_table* m68hc12_elf_bfd_link_hash_table_create
43 PARAMS((bfd*));
44
45static bfd_boolean m68hc12_elf_set_mach_from_flags PARAMS ((bfd *));
46
47/* Use REL instead of RELA to save space */
48#define USE_REL 1
49
50/* The 68HC12 microcontroler has a memory bank switching system
51 with a 16Kb window in the 64Kb address space. The extended memory
52 is mapped in the 16Kb window (at 0x8000). The page register controls
53 which 16Kb bank is mapped. The call/rtc instructions take care of
54 bank switching in function calls/returns.
55
56 For GNU Binutils to work, we consider there is a physical memory
57 at 0..0x0ffff and a kind of virtual memory above that. Symbols
58 in virtual memory have their addresses treated in a special way
59 when disassembling and when linking.
60
61 For the linker to work properly, we must always relocate the virtual
62 memory as if it is mapped at 0x8000. When a 16-bit relocation is
63 made in the virtual memory, we check that it does not cross the
64 memory bank where it is used. This would involve a page change
65 which would be wrong. The 24-bit relocation is for that and it
66 treats the address as a physical address + page number.
67
68
69 Banked
70 Address Space
71 | | Page n
72 +---------------+ 0x1010000
73 | |
74 | jsr _foo |
75 | .. | Page 3
76 | _foo: |
77 +---------------+ 0x100C000
78 | |
79 | call _bar |
80 | .. | Page 2
81 | _bar: |
82 +---------------+ 0x1008000
83 /------>| |
84 | | call _foo | Page 1
85 | | |
86 | +---------------+ 0x1004000
87 Physical | | |
88 Address Space | | | Page 0
89 | | |
90 +-----------+ 0x00FFFF | +---------------+ 0x1000000
91 | | |
92 | call _foo | |
93 | | |
94 +-----------+ 0x00BFFF -+---/
95 | | |
96 | | |
97 | | 16K |
98 | | |
99 +-----------+ 0x008000 -+
100 | |
101 | |
102 = =
103 | |
104 | |
105 +-----------+ 0000
106
107
108 The 'call _foo' must be relocated with page 3 and 16-bit address
109 mapped at 0x8000.
110
111 The 3-bit and 16-bit PC rel relocation is only used by 68HC12. */
112static reloc_howto_type elf_m68hc11_howto_table[] = {
113 /* This reloc does nothing. */
114 HOWTO (R_M68HC11_NONE, /* type */
115 0, /* rightshift */
116 2, /* size (0 = byte, 1 = short, 2 = long) */
117 32, /* bitsize */
118 FALSE, /* pc_relative */
119 0, /* bitpos */
120 complain_overflow_dont,/* complain_on_overflow */
121 bfd_elf_generic_reloc, /* special_function */
122 "R_M68HC12_NONE", /* name */
123 FALSE, /* partial_inplace */
124 0, /* src_mask */
125 0, /* dst_mask */
126 FALSE), /* pcrel_offset */
127
128 /* A 8 bit absolute relocation */
129 HOWTO (R_M68HC11_8, /* type */
130 0, /* rightshift */
131 0, /* size (0 = byte, 1 = short, 2 = long) */
132 8, /* bitsize */
133 FALSE, /* pc_relative */
134 0, /* bitpos */
135 complain_overflow_bitfield, /* complain_on_overflow */
136 bfd_elf_generic_reloc, /* special_function */
137 "R_M68HC12_8", /* name */
138 FALSE, /* partial_inplace */
139 0x00ff, /* src_mask */
140 0x00ff, /* dst_mask */
141 FALSE), /* pcrel_offset */
142
143 /* A 8 bit absolute relocation (upper address) */
144 HOWTO (R_M68HC11_HI8, /* type */
145 8, /* rightshift */
146 0, /* size (0 = byte, 1 = short, 2 = long) */
147 8, /* bitsize */
148 FALSE, /* pc_relative */
149 0, /* bitpos */
150 complain_overflow_bitfield, /* complain_on_overflow */
151 bfd_elf_generic_reloc, /* special_function */
152 "R_M68HC12_HI8", /* name */
153 FALSE, /* partial_inplace */
154 0x00ff, /* src_mask */
155 0x00ff, /* dst_mask */
156 FALSE), /* pcrel_offset */
157
158 /* A 8 bit absolute relocation (upper address) */
159 HOWTO (R_M68HC11_LO8, /* type */
160 0, /* rightshift */
161 0, /* size (0 = byte, 1 = short, 2 = long) */
162 8, /* bitsize */
163 FALSE, /* pc_relative */
164 0, /* bitpos */
165 complain_overflow_dont, /* complain_on_overflow */
166 bfd_elf_generic_reloc, /* special_function */
167 "R_M68HC12_LO8", /* name */
168 FALSE, /* partial_inplace */
169 0x00ff, /* src_mask */
170 0x00ff, /* dst_mask */
171 FALSE), /* pcrel_offset */
172
173 /* A 8 bit PC-rel relocation */
174 HOWTO (R_M68HC11_PCREL_8, /* type */
175 0, /* rightshift */
176 0, /* size (0 = byte, 1 = short, 2 = long) */
177 8, /* bitsize */
178 TRUE, /* pc_relative */
179 0, /* bitpos */
180 complain_overflow_bitfield, /* complain_on_overflow */
181 bfd_elf_generic_reloc, /* special_function */
182 "R_M68HC12_PCREL_8", /* name */
183 FALSE, /* partial_inplace */
184 0x00ff, /* src_mask */
185 0x00ff, /* dst_mask */
186 TRUE), /* pcrel_offset */
187
188 /* A 16 bit absolute relocation */
189 HOWTO (R_M68HC11_16, /* type */
190 0, /* rightshift */
191 1, /* size (0 = byte, 1 = short, 2 = long) */
192 16, /* bitsize */
193 FALSE, /* pc_relative */
194 0, /* bitpos */
195 complain_overflow_dont /*bitfield */ , /* complain_on_overflow */
196 bfd_elf_generic_reloc, /* special_function */
197 "R_M68HC12_16", /* name */
198 FALSE, /* partial_inplace */
199 0xffff, /* src_mask */
200 0xffff, /* dst_mask */
201 FALSE), /* pcrel_offset */
202
203 /* A 32 bit absolute relocation. This one is never used for the
204 code relocation. It's used by gas for -gstabs generation. */
205 HOWTO (R_M68HC11_32, /* type */
206 0, /* rightshift */
207 2, /* size (0 = byte, 1 = short, 2 = long) */
208 32, /* bitsize */
209 FALSE, /* pc_relative */
210 0, /* bitpos */
211 complain_overflow_bitfield, /* complain_on_overflow */
212 bfd_elf_generic_reloc, /* special_function */
213 "R_M68HC12_32", /* name */
214 FALSE, /* partial_inplace */
215 0xffffffff, /* src_mask */
216 0xffffffff, /* dst_mask */
217 FALSE), /* pcrel_offset */
218
219 /* A 3 bit absolute relocation */
220 HOWTO (R_M68HC11_3B, /* type */
221 0, /* rightshift */
222 0, /* size (0 = byte, 1 = short, 2 = long) */
223 3, /* bitsize */
224 FALSE, /* pc_relative */
225 0, /* bitpos */
226 complain_overflow_bitfield, /* complain_on_overflow */
227 bfd_elf_generic_reloc, /* special_function */
228 "R_M68HC12_4B", /* name */
229 FALSE, /* partial_inplace */
230 0x003, /* src_mask */
231 0x003, /* dst_mask */
232 FALSE), /* pcrel_offset */
233
234 /* A 16 bit PC-rel relocation */
235 HOWTO (R_M68HC11_PCREL_16, /* type */
236 0, /* rightshift */
237 1, /* size (0 = byte, 1 = short, 2 = long) */
238 16, /* bitsize */
239 TRUE, /* pc_relative */
240 0, /* bitpos */
241 complain_overflow_dont, /* complain_on_overflow */
242 bfd_elf_generic_reloc, /* special_function */
243 "R_M68HC12_PCREL_16", /* name */
244 FALSE, /* partial_inplace */
245 0xffff, /* src_mask */
246 0xffff, /* dst_mask */
247 TRUE), /* pcrel_offset */
248
249 /* GNU extension to record C++ vtable hierarchy */
250 HOWTO (R_M68HC11_GNU_VTINHERIT, /* type */
251 0, /* rightshift */
252 1, /* size (0 = byte, 1 = short, 2 = long) */
253 0, /* bitsize */
254 FALSE, /* pc_relative */
255 0, /* bitpos */
256 complain_overflow_dont, /* complain_on_overflow */
257 NULL, /* special_function */
258 "R_M68HC11_GNU_VTINHERIT", /* name */
259 FALSE, /* partial_inplace */
260 0, /* src_mask */
261 0, /* dst_mask */
262 FALSE), /* pcrel_offset */
263
264 /* GNU extension to record C++ vtable member usage */
265 HOWTO (R_M68HC11_GNU_VTENTRY, /* type */
266 0, /* rightshift */
267 1, /* size (0 = byte, 1 = short, 2 = long) */
268 0, /* bitsize */
269 FALSE, /* pc_relative */
270 0, /* bitpos */
271 complain_overflow_dont, /* complain_on_overflow */
272 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
273 "R_M68HC11_GNU_VTENTRY", /* name */
274 FALSE, /* partial_inplace */
275 0, /* src_mask */
276 0, /* dst_mask */
277 FALSE), /* pcrel_offset */
278
279 /* A 24 bit relocation */
280 HOWTO (R_M68HC11_24, /* type */
281 0, /* rightshift */
282 2, /* size (0 = byte, 1 = short, 2 = long) */
283 24, /* bitsize */
284 FALSE, /* pc_relative */
285 0, /* bitpos */
286 complain_overflow_dont, /* complain_on_overflow */
287 m68hc11_elf_special_reloc, /* special_function */
288 "R_M68HC12_24", /* name */
289 FALSE, /* partial_inplace */
290 0xffffff, /* src_mask */
291 0xffffff, /* dst_mask */
292 FALSE), /* pcrel_offset */
293
294 /* A 16-bit low relocation */
295 HOWTO (R_M68HC11_LO16, /* type */
296 0, /* rightshift */
297 1, /* size (0 = byte, 1 = short, 2 = long) */
298 16, /* bitsize */
299 FALSE, /* pc_relative */
300 0, /* bitpos */
301 complain_overflow_dont, /* complain_on_overflow */
302 m68hc11_elf_special_reloc,/* special_function */
303 "R_M68HC12_LO16", /* name */
304 FALSE, /* partial_inplace */
305 0xffff, /* src_mask */
306 0xffff, /* dst_mask */
307 FALSE), /* pcrel_offset */
308
309 /* A page relocation */
310 HOWTO (R_M68HC11_PAGE, /* type */
311 0, /* rightshift */
312 0, /* size (0 = byte, 1 = short, 2 = long) */
313 8, /* bitsize */
314 FALSE, /* pc_relative */
315 0, /* bitpos */
316 complain_overflow_dont, /* complain_on_overflow */
317 m68hc11_elf_special_reloc,/* special_function */
318 "R_M68HC12_PAGE", /* name */
319 FALSE, /* partial_inplace */
320 0x00ff, /* src_mask */
321 0x00ff, /* dst_mask */
322 FALSE), /* pcrel_offset */
323
324 EMPTY_HOWTO (14),
325 EMPTY_HOWTO (15),
326 EMPTY_HOWTO (16),
327 EMPTY_HOWTO (17),
328 EMPTY_HOWTO (18),
329 EMPTY_HOWTO (19),
330
331 /* Mark beginning of a jump instruction (any form). */
332 HOWTO (R_M68HC11_RL_JUMP, /* type */
333 0, /* rightshift */
334 1, /* size (0 = byte, 1 = short, 2 = long) */
335 0, /* bitsize */
336 FALSE, /* pc_relative */
337 0, /* bitpos */
338 complain_overflow_dont, /* complain_on_overflow */
339 m68hc11_elf_ignore_reloc, /* special_function */
340 "R_M68HC12_RL_JUMP", /* name */
341 TRUE, /* partial_inplace */
342 0, /* src_mask */
343 0, /* dst_mask */
344 TRUE), /* pcrel_offset */
345
346 /* Mark beginning of Gcc relaxation group instruction. */
347 HOWTO (R_M68HC11_RL_GROUP, /* type */
348 0, /* rightshift */
349 1, /* size (0 = byte, 1 = short, 2 = long) */
350 0, /* bitsize */
351 FALSE, /* pc_relative */
352 0, /* bitpos */
353 complain_overflow_dont, /* complain_on_overflow */
354 m68hc11_elf_ignore_reloc, /* special_function */
355 "R_M68HC12_RL_GROUP", /* name */
356 TRUE, /* partial_inplace */
357 0, /* src_mask */
358 0, /* dst_mask */
359 TRUE), /* pcrel_offset */
360};
361
362/* Map BFD reloc types to M68HC11 ELF reloc types. */
363
364struct m68hc11_reloc_map
365{
366 bfd_reloc_code_real_type bfd_reloc_val;
367 unsigned char elf_reloc_val;
368};
369
370static const struct m68hc11_reloc_map m68hc11_reloc_map[] = {
371 {BFD_RELOC_NONE, R_M68HC11_NONE,},
372 {BFD_RELOC_8, R_M68HC11_8},
373 {BFD_RELOC_M68HC11_HI8, R_M68HC11_HI8},
374 {BFD_RELOC_M68HC11_LO8, R_M68HC11_LO8},
375 {BFD_RELOC_8_PCREL, R_M68HC11_PCREL_8},
376 {BFD_RELOC_16_PCREL, R_M68HC11_PCREL_16},
377 {BFD_RELOC_16, R_M68HC11_16},
378 {BFD_RELOC_32, R_M68HC11_32},
379 {BFD_RELOC_M68HC11_3B, R_M68HC11_3B},
380
381 {BFD_RELOC_VTABLE_INHERIT, R_M68HC11_GNU_VTINHERIT},
382 {BFD_RELOC_VTABLE_ENTRY, R_M68HC11_GNU_VTENTRY},
383
384 {BFD_RELOC_M68HC11_LO16, R_M68HC11_LO16},
385 {BFD_RELOC_M68HC11_PAGE, R_M68HC11_PAGE},
386 {BFD_RELOC_M68HC11_24, R_M68HC11_24},
387
388 {BFD_RELOC_M68HC11_RL_JUMP, R_M68HC11_RL_JUMP},
389 {BFD_RELOC_M68HC11_RL_GROUP, R_M68HC11_RL_GROUP},
390};
391
392static reloc_howto_type *
393bfd_elf32_bfd_reloc_type_lookup (abfd, code)
394 bfd *abfd ATTRIBUTE_UNUSED;
395 bfd_reloc_code_real_type code;
396{
397 unsigned int i;
398
399 for (i = 0;
400 i < sizeof (m68hc11_reloc_map) / sizeof (struct m68hc11_reloc_map);
401 i++)
402 {
403 if (m68hc11_reloc_map[i].bfd_reloc_val == code)
404 return &elf_m68hc11_howto_table[m68hc11_reloc_map[i].elf_reloc_val];
405 }
406
407 return NULL;
408}
409
410/* Set the howto pointer for an M68HC11 ELF reloc. */
411
412static void
413m68hc11_info_to_howto_rel (abfd, cache_ptr, dst)
414 bfd *abfd ATTRIBUTE_UNUSED;
415 arelent *cache_ptr;
416 Elf_Internal_Rela *dst;
417{
418 unsigned int r_type;
419
420 r_type = ELF32_R_TYPE (dst->r_info);
421 BFD_ASSERT (r_type < (unsigned int) R_M68HC11_max);
422 cache_ptr->howto = &elf_m68hc11_howto_table[r_type];
423}
424
425
426
427/* Far trampoline generation. */
428
429/* Build a 68HC12 trampoline stub. */
430static bfd_boolean
431m68hc12_elf_build_one_stub (gen_entry, in_arg)
432 struct bfd_hash_entry *gen_entry;
433 PTR in_arg;
434{
435 struct elf32_m68hc11_stub_hash_entry *stub_entry;
436 struct bfd_link_info *info;
437 struct m68hc11_elf_link_hash_table *htab;
438 asection *stub_sec;
439 bfd *stub_bfd;
440 bfd_byte *loc;
441 bfd_vma sym_value, phys_page, phys_addr;
442
443 /* Massage our args to the form they really have. */
444 stub_entry = (struct elf32_m68hc11_stub_hash_entry *) gen_entry;
445 info = (struct bfd_link_info *) in_arg;
446
447 htab = m68hc11_elf_hash_table (info);
448
449 stub_sec = stub_entry->stub_sec;
450
451 /* Make a note of the offset within the stubs for this entry. */
452 stub_entry->stub_offset = stub_sec->_raw_size;
453 stub_sec->_raw_size += 7;
454 loc = stub_sec->contents + stub_entry->stub_offset;
455
456 stub_bfd = stub_sec->owner;
457
458 /* Create the trampoline call stub:
459
460 ldy #%addr(symbol)
461 call %page(symbol), __trampoline
462
463 */
464 sym_value = (stub_entry->target_value
465 + stub_entry->target_section->output_offset
466 + stub_entry->target_section->output_section->vma);
467 phys_addr = m68hc11_phys_addr (&htab->pinfo, sym_value);
468 phys_page = m68hc11_phys_page (&htab->pinfo, sym_value);
469
470 /* ldy #%page(sym) */
471 bfd_put_8 (stub_bfd, 0xCD, loc);
472 bfd_put_16 (stub_bfd, phys_addr, loc + 1);
473 loc += 3;
474
475 /* call %page(sym), __trampoline */
476 bfd_put_8 (stub_bfd, 0x4a, loc);
477 bfd_put_16 (stub_bfd, htab->pinfo.trampoline_addr, loc + 1);
478 bfd_put_8 (stub_bfd, phys_page, loc + 3);
479
480 return TRUE;
481}
482
483/* As above, but don't actually build the stub. Just bump offset so
484 we know stub section sizes. */
485
486static bfd_boolean
487m68hc12_elf_size_one_stub (gen_entry, in_arg)
488 struct bfd_hash_entry *gen_entry;
489 PTR in_arg ATTRIBUTE_UNUSED;
490{
491 struct elf32_m68hc11_stub_hash_entry *stub_entry;
492
493 /* Massage our args to the form they really have. */
494 stub_entry = (struct elf32_m68hc11_stub_hash_entry *) gen_entry;
495
496 stub_entry->stub_sec->_raw_size += 7;
497 return TRUE;
498}
499
500/* Create a 68HC12 ELF linker hash table. */
501
502static struct bfd_link_hash_table *
503m68hc12_elf_bfd_link_hash_table_create (abfd)
504 bfd *abfd;
505{
506 struct m68hc11_elf_link_hash_table *ret;
507
508 ret = m68hc11_elf_hash_table_create (abfd);
509 if (ret == (struct m68hc11_elf_link_hash_table *) NULL)
510 return NULL;
511
512 ret->size_one_stub = m68hc12_elf_size_one_stub;
513 ret->build_one_stub = m68hc12_elf_build_one_stub;
514
515 return &ret->root.root;
516}
517
518
519static bfd_boolean
520m68hc12_elf_set_mach_from_flags (abfd)
521 bfd *abfd;
522{
523 flagword flags = elf_elfheader (abfd)->e_flags;
524
525 switch (flags & EF_M68HC11_MACH_MASK)
526 {
527 case EF_M68HC12_MACH:
528 bfd_default_set_arch_mach (abfd, bfd_arch_m68hc12, bfd_mach_m6812);
529 break;
530 case EF_M68HCS12_MACH:
531 bfd_default_set_arch_mach (abfd, bfd_arch_m68hc12, bfd_mach_m6812s);
532 break;
533 case EF_M68HC11_GENERIC:
534 bfd_default_set_arch_mach (abfd, bfd_arch_m68hc12,
535 bfd_mach_m6812_default);
536 break;
537 default:
538 return FALSE;
539 }
540 return TRUE;
541}
542
543#define ELF_ARCH bfd_arch_m68hc12
544#define ELF_MACHINE_CODE EM_68HC12
545#define ELF_MAXPAGESIZE 0x1000
546
547#define TARGET_BIG_SYM bfd_elf32_m68hc12_vec
548#define TARGET_BIG_NAME "elf32-m68hc12"
549
550#define elf_info_to_howto 0
551#define elf_info_to_howto_rel m68hc11_info_to_howto_rel
552#define elf_backend_gc_mark_hook elf32_m68hc11_gc_mark_hook
553#define elf_backend_gc_sweep_hook elf32_m68hc11_gc_sweep_hook
554#define elf_backend_check_relocs elf32_m68hc11_check_relocs
555#define elf_backend_relocate_section elf32_m68hc11_relocate_section
556#define elf_backend_object_p m68hc12_elf_set_mach_from_flags
557#define elf_backend_final_write_processing 0
558#define elf_backend_can_gc_sections 1
559#define elf_backend_post_process_headers elf32_m68hc11_post_process_headers
560#define elf_backend_add_symbol_hook elf32_m68hc11_add_symbol_hook
561
562#define bfd_elf32_bfd_link_hash_table_create \
563 m68hc12_elf_bfd_link_hash_table_create
564#define bfd_elf32_bfd_link_hash_table_free \
565 m68hc11_elf_bfd_link_hash_table_free
566#define bfd_elf32_bfd_merge_private_bfd_data \
567 _bfd_m68hc11_elf_merge_private_bfd_data
568#define bfd_elf32_bfd_set_private_flags _bfd_m68hc11_elf_set_private_flags
569#define bfd_elf32_bfd_print_private_bfd_data \
570 _bfd_m68hc11_elf_print_private_bfd_data
571
572#include "elf32-target.h"
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