1 /* BFD back-end for raw ARM a.out binaries.
2 Copyright 1994, 1995, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2005
3 Free Software Foundation, Inc.
4 Contributed by Richard Earnshaw (rwe@pegasus.esprit.ec.org)
5
6 This file is part of BFD, the Binary File Descriptor library.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
21
22 #include "bfd.h"
23 #include "sysdep.h"
24
25 /* Avoid multiple definitions from aoutx if supporting standard a.out
26 as well as our own. */
27 /* Do not "beautify" the CONCAT* macro args. Traditional C will not
28 remove whitespace added here, and thus will fail to concatenate
29 the tokens. */
30 #define NAME(x,y) CONCAT3 (aoutarm,_32_,y)
31
32 #define N_TXTADDR(x) \
33 ((N_MAGIC (x) == NMAGIC) \
34 ? (bfd_vma) 0x8000 \
35 : ((N_MAGIC (x) != ZMAGIC) \
36 ? (bfd_vma) 0 \
37 : ((N_SHARED_LIB (x)) \
38 ? ((x).a_entry & ~(bfd_vma) (TARGET_PAGE_SIZE - 1)) \
39 : (bfd_vma) TEXT_START_ADDR)))
40
41 #define TEXT_START_ADDR 0x8000
42 #define TARGET_PAGE_SIZE 0x8000
43 #define SEGMENT_SIZE TARGET_PAGE_SIZE
44 #define DEFAULT_ARCH bfd_arch_arm
45
46 #define MY(OP) CONCAT2 (aoutarm_,OP)
47 #define N_BADMAG(x) ((((x).a_info & ~007200) != ZMAGIC) && \
48 (((x).a_info & ~006000) != OMAGIC) && \
49 ((x).a_info != NMAGIC))
50 #define N_MAGIC(x) ((x).a_info & ~07200)
51
52 #define MY_bfd_reloc_type_lookup aoutarm_bfd_reloc_type_lookup
53
54 #include "libaout.h"
55 #include "aout/aout64.h"
56
57
58 static bfd_reloc_status_type
59 MY (fix_pcrel_26) (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
60 static bfd_reloc_status_type
61 MY (fix_pcrel_26_done) (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
62
63 reloc_howto_type MY (howto_table)[] =
64 {
65 /* Type rs size bsz pcrel bitpos ovrf sf name part_inpl
66 readmask setmask pcdone. */
67 HOWTO (0, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, 0, "8", TRUE,
68 0x000000ff, 0x000000ff, FALSE),
69 HOWTO (1, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 0, "16", TRUE,
70 0x0000ffff, 0x0000ffff, FALSE),
71 HOWTO (2, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 0, "32", TRUE,
72 0xffffffff, 0xffffffff, FALSE),
73 HOWTO (3, 2, 2, 26, TRUE, 0, complain_overflow_signed, MY (fix_pcrel_26),
74 "ARM26", TRUE, 0x00ffffff, 0x00ffffff, TRUE),
75 HOWTO (4, 0, 0, 8, TRUE, 0, complain_overflow_signed, 0, "DISP8", TRUE,
76 0x000000ff, 0x000000ff, TRUE),
77 HOWTO (5, 0, 1, 16, TRUE, 0, complain_overflow_signed, 0, "DISP16", TRUE,
78 0x0000ffff, 0x0000ffff, TRUE),
79 HOWTO (6, 0, 2, 32, TRUE, 0, complain_overflow_signed, 0, "DISP32", TRUE,
80 0xffffffff, 0xffffffff, TRUE),
81 HOWTO (7, 2, 2, 26, FALSE, 0, complain_overflow_signed,
82 MY (fix_pcrel_26_done), "ARM26D", TRUE, 0x0, 0x0,
83 FALSE),
84 EMPTY_HOWTO (-1),
85 HOWTO (9, 0, -1, 16, FALSE, 0, complain_overflow_bitfield, 0, "NEG16", TRUE,
86 0x0000ffff, 0x0000ffff, FALSE),
87 HOWTO (10, 0, -2, 32, FALSE, 0, complain_overflow_bitfield, 0, "NEG32", TRUE,
88 0xffffffff, 0xffffffff, FALSE)
89 };
90
91 #define RELOC_ARM_BITS_NEG_BIG ((unsigned int) 0x08)
92 #define RELOC_ARM_BITS_NEG_LITTLE ((unsigned int) 0x10)
93
94 static reloc_howto_type *
MY(reloc_howto)95 MY (reloc_howto) (bfd *abfd,
96 struct reloc_std_external *rel,
97 int *r_index,
98 int *r_extern,
99 int *r_pcrel)
100 {
101 unsigned int r_length;
102 unsigned int r_pcrel_done;
103 unsigned int r_neg;
104 int index;
105
106 *r_pcrel = 0;
107 if (bfd_header_big_endian (abfd))
108 {
109 *r_index = ((rel->r_index[0] << 16)
110 | (rel->r_index[1] << 8)
111 | rel->r_index[2]);
112 *r_extern = (0 != (rel->r_type[0] & RELOC_STD_BITS_EXTERN_BIG));
113 r_pcrel_done = (0 != (rel->r_type[0] & RELOC_STD_BITS_PCREL_BIG));
114 r_neg = (0 != (rel->r_type[0] & RELOC_ARM_BITS_NEG_BIG));
115 r_length = ((rel->r_type[0] & RELOC_STD_BITS_LENGTH_BIG)
116 >> RELOC_STD_BITS_LENGTH_SH_BIG);
117 }
118 else
119 {
120 *r_index = ((rel->r_index[2] << 16)
121 | (rel->r_index[1] << 8)
122 | rel->r_index[0]);
123 *r_extern = (0 != (rel->r_type[0] & RELOC_STD_BITS_EXTERN_LITTLE));
124 r_pcrel_done = (0 != (rel->r_type[0] & RELOC_STD_BITS_PCREL_LITTLE));
125 r_neg = (0 != (rel->r_type[0] & RELOC_ARM_BITS_NEG_LITTLE));
126 r_length = ((rel->r_type[0] & RELOC_STD_BITS_LENGTH_LITTLE)
127 >> RELOC_STD_BITS_LENGTH_SH_LITTLE);
128 }
129 index = r_length + 4 * r_pcrel_done + 8 * r_neg;
130 if (index == 3)
131 *r_pcrel = 1;
132
133 return MY (howto_table) + index;
134 }
135
136 #define MY_reloc_howto(BFD, REL, IN, EX, PC) \
137 MY (reloc_howto) (BFD, REL, &IN, &EX, &PC)
138
139 static void
MY(put_reloc)140 MY (put_reloc) (bfd *abfd,
141 int r_extern,
142 int r_index,
143 bfd_vma value,
144 reloc_howto_type *howto,
145 struct reloc_std_external *reloc)
146 {
147 unsigned int r_length;
148 int r_pcrel;
149 int r_neg;
150
151 PUT_WORD (abfd, value, reloc->r_address);
152 /* Size as a power of two. */
153 r_length = howto->size;
154
155 /* Special case for branch relocations. */
156 if (howto->type == 3 || howto->type == 7)
157 r_length = 3;
158
159 r_pcrel = howto->type & 4; /* PC Relative done? */
160 r_neg = howto->type & 8; /* Negative relocation. */
161
162 if (bfd_header_big_endian (abfd))
163 {
164 reloc->r_index[0] = r_index >> 16;
165 reloc->r_index[1] = r_index >> 8;
166 reloc->r_index[2] = r_index;
167 reloc->r_type[0] =
168 ((r_extern ? RELOC_STD_BITS_EXTERN_BIG : 0)
169 | (r_pcrel ? RELOC_STD_BITS_PCREL_BIG : 0)
170 | (r_neg ? RELOC_ARM_BITS_NEG_BIG : 0)
171 | (r_length << RELOC_STD_BITS_LENGTH_SH_BIG));
172 }
173 else
174 {
175 reloc->r_index[2] = r_index >> 16;
176 reloc->r_index[1] = r_index >> 8;
177 reloc->r_index[0] = r_index;
178 reloc->r_type[0] =
179 ((r_extern ? RELOC_STD_BITS_EXTERN_LITTLE : 0)
180 | (r_pcrel ? RELOC_STD_BITS_PCREL_LITTLE : 0)
181 | (r_neg ? RELOC_ARM_BITS_NEG_LITTLE : 0)
182 | (r_length << RELOC_STD_BITS_LENGTH_SH_LITTLE));
183 }
184 }
185
186 #define MY_put_reloc(BFD, EXT, IDX, VAL, HOWTO, RELOC) \
187 MY (put_reloc) (BFD, EXT, IDX, VAL, HOWTO, RELOC)
188
189 static void
MY(relocatable_reloc)190 MY (relocatable_reloc) (reloc_howto_type *howto,
191 bfd *abfd,
192 struct reloc_std_external *reloc,
193 bfd_vma *amount,
194 bfd_vma r_addr)
195 {
196 if (howto->type == 3)
197 {
198 if (reloc->r_type[0]
199 & (bfd_header_big_endian (abfd)
200 ? RELOC_STD_BITS_EXTERN_BIG : RELOC_STD_BITS_EXTERN_LITTLE))
201 /* The reloc is still external, so don't modify anything. */
202 *amount = 0;
203 else
204 {
205 *amount -= r_addr;
206 /* Change the r_pcrel value -- on the ARM, this bit is set once the
207 relocation is done. */
208 if (bfd_header_big_endian (abfd))
209 reloc->r_type[0] |= RELOC_STD_BITS_PCREL_BIG;
210 else
211 reloc->r_type[0] |= RELOC_STD_BITS_PCREL_LITTLE;
212 }
213 }
214 else if (howto->type == 7)
215 *amount = 0;
216 }
217
218 #define MY_relocatable_reloc(HOW, BFD, REL, AMOUNT, ADDR) \
219 MY (relocatable_reloc) (HOW, BFD, REL, &(AMOUNT), ADDR)
220
221 static bfd_reloc_status_type
MY(fix_pcrel_26_done)222 MY (fix_pcrel_26_done) (bfd *abfd ATTRIBUTE_UNUSED,
223 arelent *reloc_entry ATTRIBUTE_UNUSED,
224 asymbol *symbol ATTRIBUTE_UNUSED,
225 void * data ATTRIBUTE_UNUSED,
226 asection *input_section ATTRIBUTE_UNUSED,
227 bfd *output_bfd ATTRIBUTE_UNUSED,
228 char **error_message ATTRIBUTE_UNUSED)
229 {
230 /* This is dead simple at present. */
231 return bfd_reloc_ok;
232 }
233
234 static bfd_reloc_status_type
MY(fix_pcrel_26)235 MY (fix_pcrel_26) (bfd *abfd,
236 arelent *reloc_entry,
237 asymbol *symbol,
238 void * data,
239 asection *input_section,
240 bfd *output_bfd,
241 char **error_message ATTRIBUTE_UNUSED)
242 {
243 bfd_vma relocation;
244 bfd_size_type addr = reloc_entry->address;
245 bfd_vma target = bfd_get_32 (abfd, (bfd_byte *) data + addr);
246 bfd_reloc_status_type flag = bfd_reloc_ok;
247
248 /* If this is an undefined symbol, return error. */
249 if (symbol->section == &bfd_und_section
250 && (symbol->flags & BSF_WEAK) == 0)
251 return output_bfd ? bfd_reloc_ok : bfd_reloc_undefined;
252
253 /* If the sections are different, and we are doing a partial relocation,
254 just ignore it for now. */
255 if (symbol->section->name != input_section->name
256 && output_bfd != NULL)
257 return bfd_reloc_ok;
258
259 relocation = (target & 0x00ffffff) << 2;
260 relocation = (relocation ^ 0x02000000) - 0x02000000; /* Sign extend. */
261 relocation += symbol->value;
262 relocation += symbol->section->output_section->vma;
263 relocation += symbol->section->output_offset;
264 relocation += reloc_entry->addend;
265 relocation -= input_section->output_section->vma;
266 relocation -= input_section->output_offset;
267 relocation -= addr;
268 if (relocation & 3)
269 return bfd_reloc_overflow;
270
271 /* Check for overflow. */
272 if (relocation & 0x02000000)
273 {
274 if ((relocation & ~ (bfd_vma) 0x03ffffff) != ~ (bfd_vma) 0x03ffffff)
275 flag = bfd_reloc_overflow;
276 }
277 else if (relocation & ~ (bfd_vma) 0x03ffffff)
278 flag = bfd_reloc_overflow;
279
280 target &= ~ (bfd_vma) 0x00ffffff;
281 target |= (relocation >> 2) & 0x00ffffff;
282 bfd_put_32 (abfd, target, (bfd_byte *) data + addr);
283
284 /* Now the ARM magic... Change the reloc type so that it is marked as done.
285 Strictly this is only necessary if we are doing a partial relocation. */
286 reloc_entry->howto = &MY (howto_table)[7];
287
288 return flag;
289 }
290
291 static reloc_howto_type *
MY(bfd_reloc_type_lookup)292 MY (bfd_reloc_type_lookup) (bfd *abfd,
293 bfd_reloc_code_real_type code)
294 {
295 #define ASTD(i,j) case i: return & MY (howto_table)[j]
296
297 if (code == BFD_RELOC_CTOR)
298 switch (bfd_get_arch_info (abfd)->bits_per_address)
299 {
300 case 32:
301 code = BFD_RELOC_32;
302 break;
303 default:
304 return NULL;
305 }
306
307 switch (code)
308 {
309 ASTD (BFD_RELOC_16, 1);
310 ASTD (BFD_RELOC_32, 2);
311 ASTD (BFD_RELOC_ARM_PCREL_BRANCH, 3);
312 ASTD (BFD_RELOC_8_PCREL, 4);
313 ASTD (BFD_RELOC_16_PCREL, 5);
314 ASTD (BFD_RELOC_32_PCREL, 6);
315 default:
316 return NULL;
317 }
318 }
319
320 #define MY_swap_std_reloc_in MY (swap_std_reloc_in)
321 #define MY_swap_std_reloc_out MY (swap_std_reloc_out)
322 #define MY_get_section_contents _bfd_generic_get_section_contents
323
324 void MY_swap_std_reloc_in (bfd *, struct reloc_std_external *, arelent *, asymbol **, bfd_size_type);
325 void MY_swap_std_reloc_out (bfd *, arelent *, struct reloc_std_external *);
326
327 #include "aoutx.h"
328
329 void
MY_swap_std_reloc_in(bfd * abfd,struct reloc_std_external * bytes,arelent * cache_ptr,asymbol ** symbols,bfd_size_type symcount ATTRIBUTE_UNUSED)330 MY_swap_std_reloc_in (bfd *abfd,
331 struct reloc_std_external *bytes,
332 arelent *cache_ptr,
333 asymbol **symbols,
334 bfd_size_type symcount ATTRIBUTE_UNUSED)
335 {
336 int r_index;
337 int r_extern;
338 int r_pcrel;
339 struct aoutdata *su = &(abfd->tdata.aout_data->a);
340
341 cache_ptr->address = H_GET_32 (abfd, bytes->r_address);
342
343 cache_ptr->howto = MY_reloc_howto (abfd, bytes, r_index, r_extern, r_pcrel);
344
345 MOVE_ADDRESS (0);
346 }
347
348 void
MY_swap_std_reloc_out(bfd * abfd,arelent * g,struct reloc_std_external * natptr)349 MY_swap_std_reloc_out (bfd *abfd,
350 arelent *g,
351 struct reloc_std_external *natptr)
352 {
353 int r_index;
354 asymbol *sym = *(g->sym_ptr_ptr);
355 int r_extern;
356 int r_length;
357 int r_pcrel;
358 int r_neg = 0; /* Negative relocs use the BASEREL bit. */
359 asection *output_section = sym->section->output_section;
360
361 PUT_WORD (abfd, g->address, natptr->r_address);
362
363 r_length = g->howto->size ; /* Size as a power of two. */
364 if (r_length < 0)
365 {
366 r_length = -r_length;
367 r_neg = 1;
368 }
369
370 r_pcrel = (int) g->howto->pc_relative; /* Relative to PC? */
371
372 /* For RISC iX, in pc-relative relocs the r_pcrel bit means that the
373 relocation has been done already (Only for the 26-bit one I think). */
374 if (g->howto->type == 3)
375 {
376 r_length = 3;
377 r_pcrel = 0;
378 }
379 else if (g->howto->type == 7)
380 {
381 r_length = 3;
382 r_pcrel = 1;
383 }
384
385 /* Name was clobbered by aout_write_syms to be symbol index. */
386
387 /* If this relocation is relative to a symbol then set the
388 r_index to the symbols index, and the r_extern bit.
389
390 Absolute symbols can come in in two ways, either as an offset
391 from the abs section, or as a symbol which has an abs value.
392 check for that here. */
393
394 if (bfd_is_com_section (output_section)
395 || output_section == &bfd_abs_section
396 || output_section == &bfd_und_section)
397 {
398 if (bfd_abs_section.symbol == sym)
399 {
400 /* Whoops, looked like an abs symbol, but is really an offset
401 from the abs section. */
402 r_index = 0;
403 r_extern = 0;
404 }
405 else
406 {
407 /* Fill in symbol. */
408 r_extern = 1;
409 r_index = (*(g->sym_ptr_ptr))->KEEPIT;
410 }
411 }
412 else
413 {
414 /* Just an ordinary section. */
415 r_extern = 0;
416 r_index = output_section->target_index;
417 }
418
419 /* Now the fun stuff. */
420 if (bfd_header_big_endian (abfd))
421 {
422 natptr->r_index[0] = r_index >> 16;
423 natptr->r_index[1] = r_index >> 8;
424 natptr->r_index[2] = r_index;
425 natptr->r_type[0] =
426 ( (r_extern ? RELOC_STD_BITS_EXTERN_BIG: 0)
427 | (r_pcrel ? RELOC_STD_BITS_PCREL_BIG: 0)
428 | (r_neg ? RELOC_ARM_BITS_NEG_BIG: 0)
429 | (r_length << RELOC_STD_BITS_LENGTH_SH_BIG));
430 }
431 else
432 {
433 natptr->r_index[2] = r_index >> 16;
434 natptr->r_index[1] = r_index >> 8;
435 natptr->r_index[0] = r_index;
436 natptr->r_type[0] =
437 ( (r_extern ? RELOC_STD_BITS_EXTERN_LITTLE: 0)
438 | (r_pcrel ? RELOC_STD_BITS_PCREL_LITTLE: 0)
439 | (r_neg ? RELOC_ARM_BITS_NEG_LITTLE: 0)
440 | (r_length << RELOC_STD_BITS_LENGTH_SH_LITTLE));
441 }
442 }
443
444 #define MY_BFD_TARGET
445
446 #include "aout-target.h"
447
448 extern const bfd_target aout_arm_big_vec;
449
450 const bfd_target aout_arm_little_vec =
451 {
452 "a.out-arm-little", /* Name. */
453 bfd_target_aout_flavour,
454 BFD_ENDIAN_LITTLE, /* Target byte order (little). */
455 BFD_ENDIAN_LITTLE, /* Target headers byte order (little). */
456 (HAS_RELOC | EXEC_P | /* Object flags. */
457 HAS_LINENO | HAS_DEBUG |
458 HAS_SYMS | HAS_LOCALS | DYNAMIC | WP_TEXT | D_PAGED),
459 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_CODE | SEC_DATA),
460 MY_symbol_leading_char,
461 AR_PAD_CHAR, /* AR_pad_char. */
462 15, /* AR_max_namelen. */
463 bfd_getl64, bfd_getl_signed_64, bfd_putl64,
464 bfd_getl32, bfd_getl_signed_32, bfd_putl32,
465 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* Data. */
466 bfd_getl64, bfd_getl_signed_64, bfd_putl64,
467 bfd_getl32, bfd_getl_signed_32, bfd_putl32,
468 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* Headers. */
469 {_bfd_dummy_target, MY_object_p, /* bfd_check_format. */
470 bfd_generic_archive_p, MY_core_file_p},
471 {bfd_false, MY_mkobject, /* bfd_set_format. */
472 _bfd_generic_mkarchive, bfd_false},
473 {bfd_false, MY_write_object_contents, /* bfd_write_contents. */
474 _bfd_write_archive_contents, bfd_false},
475
476 BFD_JUMP_TABLE_GENERIC (MY),
477 BFD_JUMP_TABLE_COPY (MY),
478 BFD_JUMP_TABLE_CORE (MY),
479 BFD_JUMP_TABLE_ARCHIVE (MY),
480 BFD_JUMP_TABLE_SYMBOLS (MY),
481 BFD_JUMP_TABLE_RELOCS (MY),
482 BFD_JUMP_TABLE_WRITE (MY),
483 BFD_JUMP_TABLE_LINK (MY),
484 BFD_JUMP_TABLE_DYNAMIC (MY),
485
486 & aout_arm_big_vec,
487
488 (void *) MY_backend_data,
489 };
490
491 const bfd_target aout_arm_big_vec =
492 {
493 "a.out-arm-big", /* Name. */
494 bfd_target_aout_flavour,
495 BFD_ENDIAN_BIG, /* Target byte order (big). */
496 BFD_ENDIAN_BIG, /* Target headers byte order (big). */
497 (HAS_RELOC | EXEC_P | /* Object flags. */
498 HAS_LINENO | HAS_DEBUG |
499 HAS_SYMS | HAS_LOCALS | DYNAMIC | WP_TEXT | D_PAGED),
500 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_CODE | SEC_DATA),
501 MY_symbol_leading_char,
502 AR_PAD_CHAR, /* AR_pad_char. */
503 15, /* AR_max_namelen. */
504 bfd_getb64, bfd_getb_signed_64, bfd_putb64,
505 bfd_getb32, bfd_getb_signed_32, bfd_putb32,
506 bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* Data. */
507 bfd_getb64, bfd_getb_signed_64, bfd_putb64,
508 bfd_getb32, bfd_getb_signed_32, bfd_putb32,
509 bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* Headers. */
510 {_bfd_dummy_target, MY_object_p, /* bfd_check_format. */
511 bfd_generic_archive_p, MY_core_file_p},
512 {bfd_false, MY_mkobject, /* bfd_set_format. */
513 _bfd_generic_mkarchive, bfd_false},
514 {bfd_false, MY_write_object_contents, /* bfd_write_contents. */
515 _bfd_write_archive_contents, bfd_false},
516
517 BFD_JUMP_TABLE_GENERIC (MY),
518 BFD_JUMP_TABLE_COPY (MY),
519 BFD_JUMP_TABLE_CORE (MY),
520 BFD_JUMP_TABLE_ARCHIVE (MY),
521 BFD_JUMP_TABLE_SYMBOLS (MY),
522 BFD_JUMP_TABLE_RELOCS (MY),
523 BFD_JUMP_TABLE_WRITE (MY),
524 BFD_JUMP_TABLE_LINK (MY),
525 BFD_JUMP_TABLE_DYNAMIC (MY),
526
527 & aout_arm_little_vec,
528
529 (void *) MY_backend_data,
530 };
531