1 /* BFD back-end for Intel arm COFF files.
2 Copyright 1990, 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
3 Written by Cygnus Support.
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
28 #include "coff/internal.h"
36 static bfd_reloc_status_type
37 aoutarm_fix_pcrel_26_done PARAMS ((bfd *, arelent *, asymbol *, PTR,
38 asection *, bfd *, char **));
40 static bfd_reloc_status_type
41 aoutarm_fix_pcrel_26 PARAMS ((bfd *, arelent *, asymbol *, PTR,
42 asection *, bfd *, char **));
45 static bfd_reloc_status_type coff_arm_reloc
46 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
48 static bfd_reloc_status_type
49 coff_arm_reloc (abfd, reloc_entry, symbol, data, input_section, output_bfd,
55 asection *input_section;
61 if (output_bfd == (bfd *) NULL)
62 return bfd_reloc_continue;
64 if (bfd_is_com_section (symbol->section))
66 /* We are relocating a common symbol. The current value in the
67 object file is ORIG + OFFSET, where ORIG is the value of the
68 common symbol as seen by the object file when it was compiled
69 (this may be zero if the symbol was undefined) and OFFSET is
70 the offset into the common symbol (normally zero, but may be
71 non-zero when referring to a field in a common structure).
72 ORIG is the negative of reloc_entry->addend, which is set by
73 the CALC_ADDEND macro below. We want to replace the value in
74 the object file with NEW + OFFSET, where NEW is the value of
75 the common symbol which we are going to put in the final
76 object file. NEW is symbol->value. */
77 diff = symbol->value + reloc_entry->addend;
81 /* For some reason bfd_perform_relocation always effectively
82 ignores the addend for a COFF target when producing
83 relocateable output. This seems to be always wrong for 386
84 COFF, so we handle the addend here instead. */
85 diff = reloc_entry->addend;
89 x = ((x & ~howto->dst_mask) | (((x & howto->src_mask) + diff) & howto->dst_mask))
93 reloc_howto_type *howto = reloc_entry->howto;
94 unsigned char *addr = (unsigned char *) data + reloc_entry->address;
100 char x = bfd_get_8 (abfd, addr);
102 bfd_put_8 (abfd, x, addr);
108 short x = bfd_get_16 (abfd, addr);
110 bfd_put_16 (abfd, x, addr);
116 long x = bfd_get_32 (abfd, addr);
118 bfd_put_32 (abfd, x, addr);
127 /* Now let bfd_perform_relocation finish everything up. */
128 return bfd_reloc_continue;
131 static reloc_howto_type aoutarm_std_reloc_howto[] =
133 /* type rs size bsz pcrel bitpos ovrf sf name part_inpl readmask setmask pcdone */
140 complain_overflow_bitfield, /* ovf */
141 coff_arm_reloc, /* sf */
144 0x000000ff, /*read mask */
145 0x000000ff, /* setmask */
146 PCRELOFFSET /* pcdone */),
153 complain_overflow_bitfield,
166 complain_overflow_bitfield,
179 complain_overflow_signed,
180 aoutarm_fix_pcrel_26 ,
192 complain_overflow_signed,
205 complain_overflow_signed,
218 complain_overflow_signed,
231 complain_overflow_signed,
232 aoutarm_fix_pcrel_26_done,
245 complain_overflow_bitfield,
258 complain_overflow_bitfield,
269 #define RTYPE2HOWTO(cache_ptr, dst) \
270 (cache_ptr)->howto = aoutarm_std_reloc_howto + (dst)->r_type;
272 static bfd_reloc_status_type
273 aoutarm_fix_pcrel_26_done (abfd, reloc_entry, symbol, data, input_section,
274 output_bfd, error_message)
276 arelent *reloc_entry;
279 asection *input_section;
281 char **error_message;
283 /* This is dead simple at present. */
287 static bfd_reloc_status_type
288 aoutarm_fix_pcrel_26 (abfd, reloc_entry, symbol, data, input_section,
289 output_bfd, error_message)
291 arelent *reloc_entry;
294 asection *input_section;
296 char **error_message;
299 bfd_size_type addr = reloc_entry->address;
300 long target = bfd_get_32 (abfd, (bfd_byte *) data + addr);
301 bfd_reloc_status_type flag = bfd_reloc_ok;
303 /* If this is an undefined symbol, return error */
304 if (symbol->section == &bfd_und_section
305 && (symbol->flags & BSF_WEAK) == 0)
306 return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined;
308 /* If the sections are different, and we are doing a partial relocation,
309 just ignore it for now. */
310 if (symbol->section->name != input_section->name
311 && output_bfd != (bfd *)NULL)
312 return bfd_reloc_continue;
314 relocation = (target & 0x00ffffff) << 2;
315 relocation = (relocation ^ 0x02000000) - 0x02000000; /* Sign extend */
316 relocation += symbol->value;
317 relocation += symbol->section->output_section->vma;
318 relocation += symbol->section->output_offset;
319 relocation += reloc_entry->addend;
320 relocation -= input_section->output_section->vma;
321 relocation -= input_section->output_offset;
324 return bfd_reloc_overflow;
326 /* Check for overflow */
327 if (relocation & 0x02000000)
329 if ((relocation & ~0x03ffffff) != ~0x03ffffff)
330 flag = bfd_reloc_overflow;
332 else if (relocation & ~0x03ffffff)
333 flag = bfd_reloc_overflow;
335 target &= ~0x00ffffff;
336 target |= (relocation >> 2) & 0x00ffffff;
337 bfd_put_32 (abfd, target, (bfd_byte *) data + addr);
339 /* Now the ARM magic... Change the reloc type so that it is marked as done.
340 Strictly this is only necessary if we are doing a partial relocation. */
341 reloc_entry->howto = &aoutarm_std_reloc_howto[7];
346 static CONST struct reloc_howto_struct *
347 arm_reloc_type_lookup(abfd,code)
349 bfd_reloc_code_real_type code;
351 #define ASTD(i,j) case i: return &aoutarm_std_reloc_howto[j]
352 if (code == BFD_RELOC_CTOR)
353 switch (bfd_get_arch_info (abfd)->bits_per_address)
358 default: return (CONST struct reloc_howto_struct *) 0;
363 ASTD (BFD_RELOC_16, 1);
364 ASTD (BFD_RELOC_32, 2);
365 ASTD (BFD_RELOC_ARM_PCREL_BRANCH, 3);
366 ASTD (BFD_RELOC_8_PCREL, 4);
367 ASTD (BFD_RELOC_16_PCREL, 5);
368 ASTD (BFD_RELOC_32_PCREL, 6);
369 default: return (CONST struct reloc_howto_struct *) 0;
374 #define coff_bfd_reloc_type_lookup arm_reloc_type_lookup
376 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (2)
377 /* The page size is a guess based on ELF. */
378 #define COFF_PAGE_SIZE 0x1000
380 /* For some reason when using arm COFF the value stored in the .text
381 section for a reference to a common symbol is the value itself plus
382 any desired offset. Ian Taylor, Cygnus Support. */
384 /* If we are producing relocateable output, we need to do some
385 adjustments to the object file that are not done by the
386 bfd_perform_relocation function. This function is called by every
387 reloc type to make any required adjustments. */
389 static bfd_reloc_status_type
390 aacoff_arm_reloc (abfd, reloc_entry, symbol, data, input_section, output_bfd,
393 arelent *reloc_entry;
396 asection *input_section;
398 char **error_message;
402 if (output_bfd == (bfd *) NULL)
403 return bfd_reloc_continue;
405 if (bfd_is_com_section (symbol->section))
407 /* We are relocating a common symbol. The current value in the
408 object file is ORIG + OFFSET, where ORIG is the value of the
409 common symbol as seen by the object file when it was compiled
410 (this may be zero if the symbol was undefined) and OFFSET is
411 the offset into the common symbol (normally zero, but may be
412 non-zero when referring to a field in a common structure).
413 ORIG is the negative of reloc_entry->addend, which is set by
414 the CALC_ADDEND macro below. We want to replace the value in
415 the object file with NEW + OFFSET, where NEW is the value of
416 the common symbol which we are going to put in the final
417 object file. NEW is symbol->value. */
418 diff = symbol->value + reloc_entry->addend;
422 /* For some reason bfd_perform_relocation always effectively
423 ignores the addend for a COFF target when producing
424 relocateable output. This seems to be always wrong for arm
425 COFF, so we handle the addend here instead. */
426 diff = reloc_entry->addend;
430 x = ((x & ~howto->dst_mask) | (((x & howto->src_mask) + diff) & howto->dst_mask))
434 reloc_howto_type *howto = reloc_entry->howto;
435 unsigned char *addr = (unsigned char *) data + reloc_entry->address;
441 char x = bfd_get_8 (abfd, addr);
443 bfd_put_8 (abfd, x, addr);
449 short x = bfd_get_16 (abfd, addr);
451 bfd_put_16 (abfd, x, addr);
457 long x = bfd_get_32 (abfd, addr);
459 bfd_put_32 (abfd, x, addr);
468 /* Now let bfd_perform_relocation finish everything up. */
469 return bfd_reloc_continue;
476 /* Turn a howto into a reloc nunmber */
478 #define SELECT_RELOC(x,howto) { x.r_type = howto->type; }
479 #define BADMAG(x) ARMBADMAG(x)
480 #define ARM 1 /* Customize coffcode.h */
483 /* On SCO Unix 3.2.2 the native assembler generates two .data
484 sections. We handle that by renaming the second one to .data2. It
485 does no harm to do this for any arm COFF target. */
486 #define TWO_DATA_SECS
488 /* For arm COFF a STYP_NOLOAD | STYP_BSS section is part of a shared
489 library. On some other COFF targets STYP_BSS is normally
491 #define BSS_NOLOAD_IS_SHARED_LIBRARY
494 /* We use the special COFF backend linker. */
495 #define coff_relocate_section _bfd_coff_generic_relocate_section
499 #include "coffcode.h"
501 static const bfd_target *
505 return coff_object_p(a);
518 "coff-arm", /* name */
520 bfd_target_coff_flavour,
521 false, /* data byte order is little */
522 false, /* header byte order is little */
524 (HAS_RELOC | EXEC_P | /* object flags */
525 HAS_LINENO | HAS_DEBUG |
526 HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
528 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
529 #ifdef TARGET_UNDERSCORE
530 TARGET_UNDERSCORE, /* leading underscore */
532 0, /* leading underscore */
534 '/', /* ar_pad_char */
535 15, /* ar_max_namelen */
537 2, /* minimum alignment power */
538 bfd_getl64, bfd_getl_signed_64, bfd_putl64,
539 bfd_getl32, bfd_getl_signed_32, bfd_putl32,
540 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
541 bfd_getl64, bfd_getl_signed_64, bfd_putl64,
542 bfd_getl32, bfd_getl_signed_32, bfd_putl32,
543 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */
545 /* Note that we allow an object file to be treated as a core file as well. */
546 {_bfd_dummy_target, i3coff_object_p, /* bfd_check_format */
547 bfd_generic_archive_p, i3coff_object_p},
548 {bfd_false, coff_mkobject, _bfd_generic_mkarchive, /* bfd_set_format */
550 {bfd_false, coff_write_object_contents, /* bfd_write_contents */
551 _bfd_write_archive_contents, bfd_false},
553 BFD_JUMP_TABLE_GENERIC (coff),
554 BFD_JUMP_TABLE_COPY (coff),
555 BFD_JUMP_TABLE_CORE (_bfd_nocore),
556 BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
557 BFD_JUMP_TABLE_SYMBOLS (coff),
558 BFD_JUMP_TABLE_RELOCS (coff),
559 BFD_JUMP_TABLE_WRITE (coff),
560 BFD_JUMP_TABLE_LINK (coff),
561 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),