1 # This shell script emits a C file. -*- C -*-
2 # Copyright 1991, 1993, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
3 # 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
4 # Free Software Foundation, Inc.
6 # This file is part of the GNU Binutils.
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 3 of the License, or
11 # (at your option) any later version.
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.
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,
24 # This file is sourced from elf32.em, and defines extra arm-elf
27 test -z "$TARGET2_TYPE" && TARGET2_TYPE="rel"
33 static char *thumb_entry_symbol = NULL;
34 static int byteswap_code = 0;
35 static int target1_is_rel = 0${TARGET1_IS_REL};
36 static char *target2_type = "${TARGET2_TYPE}";
37 static int fix_v4bx = 0;
38 static int use_blx = 0;
39 static bfd_arm_vfp11_fix vfp11_denorm_fix = BFD_ARM_VFP11_FIX_DEFAULT;
40 static int fix_cortex_a8 = -1;
41 static int no_enum_size_warning = 0;
42 static int no_wchar_size_warning = 0;
43 static int pic_veneer = 0;
44 static int merge_exidx_entries = -1;
45 static int fix_arm1176 = 1;
48 gld${EMULATION_NAME}_before_parse (void)
50 #ifndef TARGET_ /* I.e., if not generic. */
51 ldfile_set_output_arch ("`echo ${ARCH}`", bfd_arch_unknown);
52 #endif /* not TARGET_ */
53 input_flags.dynamic = ${DYNAMIC_LINK-TRUE};
54 config.has_shared = `if test -n "$GENERATE_SHLIB_SCRIPT" ; then echo TRUE ; else echo FALSE ; fi`;
55 config.separate_code = `if test "x${SEPARATE_CODE}" = xyes ; then echo TRUE ; else echo FALSE ; fi`;
59 arm_elf_before_allocation (void)
61 bfd_elf32_arm_set_byteswap_code (&link_info, byteswap_code);
63 /* Choose type of VFP11 erratum fix, or warn if specified fix is unnecessary
64 due to architecture version. */
65 bfd_elf32_arm_set_vfp11_fix (link_info.output_bfd, &link_info);
67 /* Auto-select Cortex-A8 erratum fix if it wasn't explicitly specified. */
68 bfd_elf32_arm_set_cortex_a8_fix (link_info.output_bfd, &link_info);
70 /* We should be able to set the size of the interworking stub section. We
71 can't do it until later if we have dynamic sections, though. */
72 if (elf_hash_table (&link_info)->dynobj == NULL)
74 /* Here we rummage through the found bfds to collect glue information. */
75 LANG_FOR_EACH_INPUT_STATEMENT (is)
77 /* Initialise mapping tables for code/data. */
78 bfd_elf32_arm_init_maps (is->the_bfd);
80 if (!bfd_elf32_arm_process_before_allocation (is->the_bfd,
82 || !bfd_elf32_arm_vfp11_erratum_scan (is->the_bfd, &link_info))
83 /* xgettext:c-format */
84 einfo (_("Errors encountered processing file %s"), is->filename);
87 /* We have seen it all. Allocate it, and carry on. */
88 bfd_elf32_arm_allocate_interworking_sections (& link_info);
91 /* Call the standard elf routine. */
92 gld${EMULATION_NAME}_before_allocation ();
95 /* Fake input file for stubs. */
96 static lang_input_statement_type *stub_file;
98 /* Whether we need to call gldarm_layout_sections_again. */
99 static int need_laying_out = 0;
101 /* Maximum size of a group of input sections that can be handled by
102 one stub section. A value of +/-1 indicates the bfd back-end
103 should use a suitable default size. */
104 static bfd_signed_vma group_size = 1;
106 struct hook_stub_info
108 lang_statement_list_type add;
109 asection *input_section;
112 /* Traverse the linker tree to find the spot where the stub goes. */
115 hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp)
117 lang_statement_union_type *l;
120 for (; (l = *lp) != NULL; lp = &l->header.next)
122 switch (l->header.type)
124 case lang_constructors_statement_enum:
125 ret = hook_in_stub (info, &constructor_list.head);
130 case lang_output_section_statement_enum:
131 ret = hook_in_stub (info,
132 &l->output_section_statement.children.head);
137 case lang_wild_statement_enum:
138 ret = hook_in_stub (info, &l->wild_statement.children.head);
143 case lang_group_statement_enum:
144 ret = hook_in_stub (info, &l->group_statement.children.head);
149 case lang_input_section_enum:
150 if (l->input_section.section == info->input_section)
152 /* We've found our section. Insert the stub immediately
153 after its associated input section. */
154 *(info->add.tail) = l->header.next;
155 l->header.next = info->add.head;
160 case lang_data_statement_enum:
161 case lang_reloc_statement_enum:
162 case lang_object_symbols_statement_enum:
163 case lang_output_statement_enum:
164 case lang_target_statement_enum:
165 case lang_input_statement_enum:
166 case lang_assignment_statement_enum:
167 case lang_padding_statement_enum:
168 case lang_address_statement_enum:
169 case lang_fill_statement_enum:
181 /* Call-back for elf32_arm_size_stubs. */
183 /* Create a new stub section, and arrange for it to be linked
184 immediately after INPUT_SECTION. */
187 elf32_arm_add_stub_section (const char *stub_sec_name,
188 asection *input_section)
192 asection *output_section;
194 lang_output_section_statement_type *os;
195 struct hook_stub_info info;
197 flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
198 | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
199 stub_sec = bfd_make_section_anyway_with_flags (stub_file->the_bfd,
200 stub_sec_name, flags);
201 if (stub_sec == NULL)
204 bfd_set_section_alignment (stub_file->the_bfd, stub_sec, 3);
206 output_section = input_section->output_section;
207 secname = bfd_get_section_name (output_section->owner, output_section);
208 os = lang_output_section_find (secname);
210 info.input_section = input_section;
211 lang_list_init (&info.add);
212 lang_add_section (&info.add, stub_sec, NULL, os);
214 if (info.add.head == NULL)
217 if (hook_in_stub (&info, &os->children.head))
221 einfo ("%X%P: can not make stub section: %E\n");
225 /* Another call-back for elf_arm_size_stubs. */
228 gldarm_layout_sections_again (void)
230 /* If we have changed sizes of the stub sections, then we need
231 to recalculate all the section offsets. This may mean we need to
232 add even more stubs. */
233 gld${EMULATION_NAME}_map_segments (TRUE);
234 need_laying_out = -1;
238 build_section_lists (lang_statement_union_type *statement)
240 if (statement->header.type == lang_input_section_enum)
242 asection *i = statement->input_section.section;
244 if (i->sec_info_type != SEC_INFO_TYPE_JUST_SYMS
245 && (i->flags & SEC_EXCLUDE) == 0
246 && i->output_section != NULL
247 && i->output_section->owner == link_info.output_bfd)
248 elf32_arm_next_input_section (& link_info, i);
253 compare_output_sec_vma (const void *a, const void *b)
255 asection *asec = *(asection **) a, *bsec = *(asection **) b;
256 asection *aout = asec->output_section, *bout = bsec->output_section;
259 /* If there's no output section for some reason, compare equal. */
263 avma = aout->vma + asec->output_offset;
264 bvma = bout->vma + bsec->output_offset;
268 else if (avma < bvma)
275 gld${EMULATION_NAME}_after_allocation (void)
277 if (!link_info.relocatable)
279 /* Build a sorted list of input text sections, then use that to process
280 the unwind table index. */
281 unsigned int list_size = 10;
282 asection **sec_list = (asection **)
283 xmalloc (list_size * sizeof (asection *));
284 unsigned int sec_count = 0;
286 LANG_FOR_EACH_INPUT_STATEMENT (is)
288 bfd *abfd = is->the_bfd;
291 if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0)
294 for (sec = abfd->sections; sec != NULL; sec = sec->next)
296 asection *out_sec = sec->output_section;
299 && elf_section_data (sec)
300 && elf_section_type (sec) == SHT_PROGBITS
301 && (elf_section_flags (sec) & SHF_EXECINSTR) != 0
302 && (sec->flags & SEC_EXCLUDE) == 0
303 && sec->sec_info_type != SEC_INFO_TYPE_JUST_SYMS
304 && out_sec != bfd_abs_section_ptr)
306 if (sec_count == list_size)
309 sec_list = (asection **)
310 xrealloc (sec_list, list_size * sizeof (asection *));
313 sec_list[sec_count++] = sec;
318 qsort (sec_list, sec_count, sizeof (asection *), &compare_output_sec_vma);
320 if (elf32_arm_fix_exidx_coverage (sec_list, sec_count, &link_info,
321 merge_exidx_entries))
327 /* bfd_elf32_discard_info just plays with debugging sections,
328 ie. doesn't affect any code, so we can delay resizing the
329 sections. It's likely we'll resize everything in the process of
331 if (bfd_elf_discard_info (link_info.output_bfd, & link_info))
334 /* If generating a relocatable output file, then we don't
335 have to examine the relocs. */
336 if (stub_file != NULL && !link_info.relocatable)
338 int ret = elf32_arm_setup_section_lists (link_info.output_bfd, & link_info);
344 einfo ("%X%P: could not compute sections lists for stub generation: %E\n");
348 lang_for_each_statement (build_section_lists);
350 /* Call into the BFD backend to do the real work. */
351 if (! elf32_arm_size_stubs (link_info.output_bfd,
355 & elf32_arm_add_stub_section,
356 & gldarm_layout_sections_again))
358 einfo ("%X%P: cannot size stub section: %E\n");
364 if (need_laying_out != -1)
365 gld${EMULATION_NAME}_map_segments (need_laying_out);
369 gld${EMULATION_NAME}_finish (void)
371 struct bfd_link_hash_entry * h;
374 LANG_FOR_EACH_INPUT_STATEMENT (is)
376 /* Figure out where VFP11 erratum veneers (and the labels returning
377 from same) have been placed. */
378 bfd_elf32_arm_vfp11_fix_veneer_locations (is->the_bfd, &link_info);
382 if (! link_info.relocatable)
384 /* Now build the linker stubs. */
385 if (stub_file->the_bfd->sections != NULL)
387 if (! elf32_arm_build_stubs (& link_info))
388 einfo ("%X%P: can not build stubs: %E\n");
394 if (thumb_entry_symbol)
396 h = bfd_link_hash_lookup (link_info.hash, thumb_entry_symbol,
401 struct elf_link_hash_entry * eh;
403 if (!entry_symbol.name)
406 h = bfd_link_hash_lookup (link_info.hash, entry_symbol.name,
408 eh = (struct elf_link_hash_entry *)h;
409 if (!h || eh->target_internal != ST_BRANCH_TO_THUMB)
414 if (h != (struct bfd_link_hash_entry *) NULL
415 && (h->type == bfd_link_hash_defined
416 || h->type == bfd_link_hash_defweak)
417 && h->u.def.section->output_section != NULL)
419 static char buffer[32];
422 /* Special procesing is required for a Thumb entry symbol. The
423 bottom bit of its address must be set. */
424 val = (h->u.def.value
425 + bfd_get_section_vma (link_info.output_bfd,
426 h->u.def.section->output_section)
427 + h->u.def.section->output_offset);
431 /* Now convert this value into a string and store it in entry_symbol
432 where the lang_finish() function will pick it up. */
436 sprintf_vma (buffer + 2, val);
438 if (thumb_entry_symbol != NULL && entry_symbol.name != NULL
439 && entry_from_cmdline)
440 einfo (_("%P: warning: '--thumb-entry %s' is overriding '-e %s'\n"),
441 thumb_entry_symbol, entry_symbol.name);
442 entry_symbol.name = buffer;
445 einfo (_("%P: warning: cannot find thumb start symbol %s\n"),
449 /* This is a convenient point to tell BFD about target specific flags.
450 After the output has been created, but before inputs are read. */
452 arm_elf_create_output_section_statements (void)
454 if (strstr (bfd_get_target (link_info.output_bfd), "arm") == NULL)
456 /* The arm backend needs special fields in the output hash structure.
457 These will only be created if the output format is an arm format,
458 hence we do not support linking and changing output formats at the
459 same time. Use a link followed by objcopy to change output formats. */
460 einfo ("%F%X%P: error: Cannot change output format whilst linking ARM binaries.\n");
464 bfd_elf32_arm_set_target_relocs (link_info.output_bfd, &link_info,
466 target2_type, fix_v4bx, use_blx,
467 vfp11_denorm_fix, no_enum_size_warning,
468 no_wchar_size_warning,
469 pic_veneer, fix_cortex_a8,
472 stub_file = lang_add_input_file ("linker stubs",
473 lang_input_file_is_fake_enum,
475 stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd);
476 if (stub_file->the_bfd == NULL
477 || ! bfd_set_arch_mach (stub_file->the_bfd,
478 bfd_get_arch (link_info.output_bfd),
479 bfd_get_mach (link_info.output_bfd)))
481 einfo ("%X%P: can not create BFD %E\n");
485 stub_file->the_bfd->flags |= BFD_LINKER_CREATED;
486 ldlang_add_file (stub_file);
488 /* Also use the stub file for stubs placed in a single output section. */
489 bfd_elf32_arm_add_glue_sections_to_bfd (stub_file->the_bfd, &link_info);
490 bfd_elf32_arm_get_bfd_for_interworking (stub_file->the_bfd, &link_info);
493 /* Avoid processing the fake stub_file in vercheck, stat_needed and
494 check_needed routines. */
496 static void (*real_func) (lang_input_statement_type *);
498 static void arm_for_each_input_file_wrapper (lang_input_statement_type *l)
505 arm_lang_for_each_input_file (void (*func) (lang_input_statement_type *))
508 lang_for_each_input_file (&arm_for_each_input_file_wrapper);
511 #define lang_for_each_input_file arm_lang_for_each_input_file
515 # Define some shell vars to insert bits of code into the standard elf
516 # parse_args and list_options functions.
518 PARSE_AND_LIST_PROLOGUE='
519 #define OPTION_THUMB_ENTRY 301
520 #define OPTION_BE8 302
521 #define OPTION_TARGET1_REL 303
522 #define OPTION_TARGET1_ABS 304
523 #define OPTION_TARGET2 305
524 #define OPTION_FIX_V4BX 306
525 #define OPTION_USE_BLX 307
526 #define OPTION_VFP11_DENORM_FIX 308
527 #define OPTION_NO_ENUM_SIZE_WARNING 309
528 #define OPTION_PIC_VENEER 310
529 #define OPTION_FIX_V4BX_INTERWORKING 311
530 #define OPTION_STUBGROUP_SIZE 312
531 #define OPTION_NO_WCHAR_SIZE_WARNING 313
532 #define OPTION_FIX_CORTEX_A8 314
533 #define OPTION_NO_FIX_CORTEX_A8 315
534 #define OPTION_NO_MERGE_EXIDX_ENTRIES 316
535 #define OPTION_FIX_ARM1176 317
536 #define OPTION_NO_FIX_ARM1176 318
539 PARSE_AND_LIST_SHORTOPTS=p
541 PARSE_AND_LIST_LONGOPTS='
542 { "no-pipeline-knowledge", no_argument, NULL, '\'p\''},
543 { "thumb-entry", required_argument, NULL, OPTION_THUMB_ENTRY},
544 { "be8", no_argument, NULL, OPTION_BE8},
545 { "target1-rel", no_argument, NULL, OPTION_TARGET1_REL},
546 { "target1-abs", no_argument, NULL, OPTION_TARGET1_ABS},
547 { "target2", required_argument, NULL, OPTION_TARGET2},
548 { "fix-v4bx", no_argument, NULL, OPTION_FIX_V4BX},
549 { "fix-v4bx-interworking", no_argument, NULL, OPTION_FIX_V4BX_INTERWORKING},
550 { "use-blx", no_argument, NULL, OPTION_USE_BLX},
551 { "vfp11-denorm-fix", required_argument, NULL, OPTION_VFP11_DENORM_FIX},
552 { "no-enum-size-warning", no_argument, NULL, OPTION_NO_ENUM_SIZE_WARNING},
553 { "pic-veneer", no_argument, NULL, OPTION_PIC_VENEER},
554 { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
555 { "no-wchar-size-warning", no_argument, NULL, OPTION_NO_WCHAR_SIZE_WARNING},
556 { "fix-cortex-a8", no_argument, NULL, OPTION_FIX_CORTEX_A8 },
557 { "no-fix-cortex-a8", no_argument, NULL, OPTION_NO_FIX_CORTEX_A8 },
558 { "no-merge-exidx-entries", no_argument, NULL, OPTION_NO_MERGE_EXIDX_ENTRIES },
559 { "fix-arm1176", no_argument, NULL, OPTION_FIX_ARM1176 },
560 { "no-fix-arm1176", no_argument, NULL, OPTION_NO_FIX_ARM1176 },
563 PARSE_AND_LIST_OPTIONS='
564 fprintf (file, _(" --thumb-entry=<sym> Set the entry point to be Thumb symbol <sym>\n"));
565 fprintf (file, _(" --be8 Output BE8 format image\n"));
566 fprintf (file, _(" --target1-rel Interpret R_ARM_TARGET1 as R_ARM_REL32\n"));
567 fprintf (file, _(" --target1-abs Interpret R_ARM_TARGET1 as R_ARM_ABS32\n"));
568 fprintf (file, _(" --target2=<type> Specify definition of R_ARM_TARGET2\n"));
569 fprintf (file, _(" --fix-v4bx Rewrite BX rn as MOV pc, rn for ARMv4\n"));
570 fprintf (file, _(" --fix-v4bx-interworking Rewrite BX rn branch to ARMv4 interworking veneer\n"));
571 fprintf (file, _(" --use-blx Enable use of BLX instructions\n"));
572 fprintf (file, _(" --vfp11-denorm-fix Specify how to fix VFP11 denorm erratum\n"));
573 fprintf (file, _(" --no-enum-size-warning Don'\''t warn about objects with incompatible\n"
575 fprintf (file, _(" --no-wchar-size-warning Don'\''t warn about objects with incompatible\n"
576 " wchar_t sizes\n"));
577 fprintf (file, _(" --pic-veneer Always generate PIC interworking veneers\n"));
579 --stub-group-size=N Maximum size of a group of input sections that\n\
580 can be handled by one stub section. A negative\n\
581 value locates all stubs after their branches\n\
582 (with a group size of -N), while a positive\n\
583 value allows two groups of input sections, one\n\
584 before, and one after each stub section.\n\
585 Values of +/-1 indicate the linker should\n\
586 choose suitable defaults.\n"));
587 fprintf (file, _(" --[no-]fix-cortex-a8 Disable/enable Cortex-A8 Thumb-2 branch erratum fix\n"));
588 fprintf (file, _(" --no-merge-exidx-entries Disable merging exidx entries\n"));
589 fprintf (file, _(" --[no-]fix-arm1176 Disable/enable ARM1176 BLX immediate erratum fix\n"));
592 PARSE_AND_LIST_ARGS_CASES='
594 /* Only here for backwards compatibility. */
597 case OPTION_THUMB_ENTRY:
598 thumb_entry_symbol = optarg;
605 case OPTION_TARGET1_REL:
609 case OPTION_TARGET1_ABS:
614 target2_type = optarg;
617 case OPTION_FIX_V4BX:
621 case OPTION_FIX_V4BX_INTERWORKING:
629 case OPTION_VFP11_DENORM_FIX:
630 if (strcmp (optarg, "none") == 0)
631 vfp11_denorm_fix = BFD_ARM_VFP11_FIX_NONE;
632 else if (strcmp (optarg, "scalar") == 0)
633 vfp11_denorm_fix = BFD_ARM_VFP11_FIX_SCALAR;
634 else if (strcmp (optarg, "vector") == 0)
635 vfp11_denorm_fix = BFD_ARM_VFP11_FIX_VECTOR;
637 einfo (_("Unrecognized VFP11 fix type '\''%s'\''.\n"), optarg);
640 case OPTION_NO_ENUM_SIZE_WARNING:
641 no_enum_size_warning = 1;
644 case OPTION_NO_WCHAR_SIZE_WARNING:
645 no_wchar_size_warning = 1;
648 case OPTION_PIC_VENEER:
652 case OPTION_STUBGROUP_SIZE:
656 group_size = bfd_scan_vma (optarg, &end, 0);
658 einfo (_("%P%F: invalid number `%s'\''\n"), optarg);
662 case OPTION_FIX_CORTEX_A8:
666 case OPTION_NO_FIX_CORTEX_A8:
670 case OPTION_NO_MERGE_EXIDX_ENTRIES:
671 merge_exidx_entries = 0;
674 case OPTION_FIX_ARM1176:
678 case OPTION_NO_FIX_ARM1176:
683 # We have our own before_allocation etc. functions, but they call
684 # the standard routines, so give them a different name.
685 LDEMUL_BEFORE_ALLOCATION=arm_elf_before_allocation
686 LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
687 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=arm_elf_create_output_section_statements
689 # Replace the elf before_parse function with our own.
690 LDEMUL_BEFORE_PARSE=gld"${EMULATION_NAME}"_before_parse
692 # Call the extra arm-elf function
693 LDEMUL_FINISH=gld${EMULATION_NAME}_finish