1 # This shell script emits a C file. -*- C -*-
2 # Copyright 1991, 1993, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
3 # 2004, 2005, 2007, 2008
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 "$TARGET2_TYPE" && TARGET2_TYPE="rel"
33 static char *thumb_entry_symbol = NULL;
34 static bfd *bfd_for_interwork;
35 static int byteswap_code = 0;
36 static int target1_is_rel = 0${TARGET1_IS_REL};
37 static char *target2_type = "${TARGET2_TYPE}";
38 static int fix_v4bx = 0;
39 static int use_blx = 0;
40 static bfd_arm_vfp11_fix vfp11_denorm_fix = BFD_ARM_VFP11_FIX_DEFAULT;
41 static int no_enum_size_warning = 0;
42 static int no_wchar_size_warning = 0;
43 static int pic_veneer = 0;
46 gld${EMULATION_NAME}_before_parse (void)
48 #ifndef TARGET_ /* I.e., if not generic. */
49 ldfile_set_output_arch ("`echo ${ARCH}`", bfd_arch_unknown);
50 #endif /* not TARGET_ */
51 config.dynamic_link = ${DYNAMIC_LINK-TRUE};
52 config.has_shared = `if test -n "$GENERATE_SHLIB_SCRIPT" ; then echo TRUE ; else echo FALSE ; fi`;
56 arm_elf_after_open (void)
58 if (strstr (bfd_get_target (link_info.output_bfd), "arm") == NULL)
60 /* The arm backend needs special fields in the output hash structure.
61 These will only be created if the output format is an arm format,
62 hence we do not support linking and changing output formats at the
63 same time. Use a link followed by objcopy to change output formats. */
64 einfo ("%F%X%P: error: cannot change output format whilst linking ARM binaries\n");
69 LANG_FOR_EACH_INPUT_STATEMENT (is)
71 bfd_elf32_arm_add_glue_sections_to_bfd (is->the_bfd, & link_info);
75 /* Call the standard elf routine. */
76 gld${EMULATION_NAME}_after_open ();
80 arm_elf_set_bfd_for_interworking (lang_statement_union_type *statement)
82 if (statement->header.type == lang_input_section_enum)
84 asection *i = statement->input_section.section;
86 if (!((lang_input_statement_type *) i->owner->usrdata)->just_syms_flag
87 && (i->flags & SEC_EXCLUDE) == 0)
89 asection *output_section = i->output_section;
91 ASSERT (output_section->owner == link_info.output_bfd);
93 /* Don't attach the interworking stubs to a dynamic object, to
94 an empty section, etc. */
95 if ((output_section->flags & SEC_HAS_CONTENTS) != 0
96 && (i->flags & SEC_NEVER_LOAD) == 0
97 && ! (i->owner->flags & DYNAMIC))
98 bfd_for_interwork = i->owner;
104 arm_elf_before_allocation (void)
106 if (link_info.input_bfds != NULL)
108 /* The interworking bfd must be the last one in the link. */
109 bfd_for_interwork = NULL;
111 lang_for_each_statement (arm_elf_set_bfd_for_interworking);
113 /* If bfd_for_interwork is NULL, then there are no loadable sections
114 with real contents to be linked, so we are not going to have to
115 create any interworking stubs, so it is OK not to call
116 bfd_elf32_arm_get_bfd_for_interworking. */
117 if (bfd_for_interwork != NULL)
118 bfd_elf32_arm_get_bfd_for_interworking (bfd_for_interwork, &link_info);
121 bfd_elf32_arm_set_byteswap_code (&link_info, byteswap_code);
123 /* Choose type of VFP11 erratum fix, or warn if specified fix is unnecessary
124 due to architecture version. */
125 bfd_elf32_arm_set_vfp11_fix (link_info.output_bfd, &link_info);
127 /* We should be able to set the size of the interworking stub section. We
128 can't do it until later if we have dynamic sections, though. */
129 if (! elf_hash_table (&link_info)->dynamic_sections_created)
131 /* Here we rummage through the found bfds to collect glue information. */
132 LANG_FOR_EACH_INPUT_STATEMENT (is)
134 /* Initialise mapping tables for code/data. */
135 bfd_elf32_arm_init_maps (is->the_bfd);
137 if (!bfd_elf32_arm_process_before_allocation (is->the_bfd,
139 || !bfd_elf32_arm_vfp11_erratum_scan (is->the_bfd, &link_info))
140 /* xgettext:c-format */
141 einfo (_("Errors encountered processing file %s"), is->filename);
145 /* Call the standard elf routine. */
146 gld${EMULATION_NAME}_before_allocation ();
148 /* We have seen it all. Allocate it, and carry on. */
149 bfd_elf32_arm_allocate_interworking_sections (& link_info);
153 arm_elf_after_allocation (void)
155 /* Call the standard elf routine. */
156 after_allocation_default ();
159 LANG_FOR_EACH_INPUT_STATEMENT (is)
161 /* Figure out where VFP11 erratum veneers (and the labels returning
162 from same) have been placed. */
163 bfd_elf32_arm_vfp11_fix_veneer_locations (is->the_bfd, &link_info);
168 /* Fake input file for stubs. */
169 static lang_input_statement_type *stub_file;
171 /* Whether we need to call gldarm_layout_sections_again. */
172 static int need_laying_out = 0;
174 /* Maximum size of a group of input sections that can be handled by
175 one stub section. A value of +/-1 indicates the bfd back-end
176 should use a suitable default size. */
177 static bfd_signed_vma group_size = 1;
179 struct hook_stub_info
181 lang_statement_list_type add;
182 asection *input_section;
185 /* Traverse the linker tree to find the spot where the stub goes. */
188 hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp)
190 lang_statement_union_type *l;
193 for (; (l = *lp) != NULL; lp = &l->header.next)
195 switch (l->header.type)
197 case lang_constructors_statement_enum:
198 ret = hook_in_stub (info, &constructor_list.head);
203 case lang_output_section_statement_enum:
204 ret = hook_in_stub (info,
205 &l->output_section_statement.children.head);
210 case lang_wild_statement_enum:
211 ret = hook_in_stub (info, &l->wild_statement.children.head);
216 case lang_group_statement_enum:
217 ret = hook_in_stub (info, &l->group_statement.children.head);
222 case lang_input_section_enum:
223 if (l->input_section.section == info->input_section)
225 /* We've found our section. Insert the stub immediately
226 before its associated input section. */
227 *lp = info->add.head;
228 *(info->add.tail) = l;
233 case lang_data_statement_enum:
234 case lang_reloc_statement_enum:
235 case lang_object_symbols_statement_enum:
236 case lang_output_statement_enum:
237 case lang_target_statement_enum:
238 case lang_input_statement_enum:
239 case lang_assignment_statement_enum:
240 case lang_padding_statement_enum:
241 case lang_address_statement_enum:
242 case lang_fill_statement_enum:
254 /* Call-back for elf32_arm_size_stubs. */
256 /* Create a new stub section, and arrange for it to be linked
257 immediately before INPUT_SECTION. */
260 elf32_arm_add_stub_section (const char *stub_sec_name,
261 asection *input_section)
265 asection *output_section;
267 lang_output_section_statement_type *os;
268 struct hook_stub_info info;
270 flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
271 | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
272 stub_sec = bfd_make_section_anyway_with_flags (stub_file->the_bfd,
273 stub_sec_name, flags);
274 if (stub_sec == NULL)
277 bfd_set_section_alignment (stub_file->the_bfd, stub_sec, 3);
279 output_section = input_section->output_section;
280 secname = bfd_get_section_name (output_section->owner, output_section);
281 os = lang_output_section_find (secname);
283 info.input_section = input_section;
284 lang_list_init (&info.add);
285 lang_add_section (&info.add, stub_sec, os);
287 if (info.add.head == NULL)
290 if (hook_in_stub (&info, &os->children.head))
294 einfo ("%X%P: can not make stub section: %E\n");
298 /* Another call-back for elf_arm_size_stubs. */
301 gldarm_layout_sections_again (void)
303 /* If we have changed sizes of the stub sections, then we need
304 to recalculate all the section offsets. This may mean we need to
305 add even more stubs. */
306 gld${EMULATION_NAME}_map_segments (TRUE);
307 need_laying_out = -1;
311 build_section_lists (lang_statement_union_type *statement)
313 if (statement->header.type == lang_input_section_enum)
315 asection *i = statement->input_section.section;
317 if (!((lang_input_statement_type *) i->owner->usrdata)->just_syms_flag
318 && (i->flags & SEC_EXCLUDE) == 0
319 && i->output_section != NULL
320 && i->output_section->owner == link_info.output_bfd)
321 elf32_arm_next_input_section (& link_info, i);
326 gld${EMULATION_NAME}_finish (void)
328 struct bfd_link_hash_entry * h;
330 /* bfd_elf32_discard_info just plays with debugging sections,
331 ie. doesn't affect any code, so we can delay resizing the
332 sections. It's likely we'll resize everything in the process of
334 if (bfd_elf_discard_info (link_info.output_bfd, & link_info))
337 /* If generating a relocatable output file, then we don't
338 have to examine the relocs. */
339 if (stub_file != NULL && !link_info.relocatable)
341 int ret = elf32_arm_setup_section_lists (link_info.output_bfd, & link_info);
347 einfo ("%X%P: could not compute sections lists for stub generation: %E\n");
351 lang_for_each_statement (build_section_lists);
353 /* Call into the BFD backend to do the real work. */
354 if (! elf32_arm_size_stubs (link_info.output_bfd,
358 & elf32_arm_add_stub_section,
359 & gldarm_layout_sections_again))
361 einfo ("%X%P: cannot size stub section: %E\n");
367 if (need_laying_out != -1)
368 gld${EMULATION_NAME}_map_segments (need_laying_out);
370 if (! link_info.relocatable)
372 /* Now build the linker stubs. */
373 if (stub_file->the_bfd->sections != NULL)
375 if (! elf32_arm_build_stubs (& link_info))
376 einfo ("%X%P: can not build stubs: %E\n");
382 if (thumb_entry_symbol)
384 h = bfd_link_hash_lookup (link_info.hash, thumb_entry_symbol,
389 struct elf_link_hash_entry * eh;
391 if (!entry_symbol.name)
394 h = bfd_link_hash_lookup (link_info.hash, entry_symbol.name,
396 eh = (struct elf_link_hash_entry *)h;
397 if (!h || ELF_ST_TYPE(eh->type) != STT_ARM_TFUNC)
402 if (h != (struct bfd_link_hash_entry *) NULL
403 && (h->type == bfd_link_hash_defined
404 || h->type == bfd_link_hash_defweak)
405 && h->u.def.section->output_section != NULL)
407 static char buffer[32];
410 /* Special procesing is required for a Thumb entry symbol. The
411 bottom bit of its address must be set. */
412 val = (h->u.def.value
413 + bfd_get_section_vma (link_info.output_bfd,
414 h->u.def.section->output_section)
415 + h->u.def.section->output_offset);
419 /* Now convert this value into a string and store it in entry_symbol
420 where the lang_finish() function will pick it up. */
424 sprintf_vma (buffer + 2, val);
426 if (thumb_entry_symbol != NULL && entry_symbol.name != NULL
427 && entry_from_cmdline)
428 einfo (_("%P: warning: '--thumb-entry %s' is overriding '-e %s'\n"),
429 thumb_entry_symbol, entry_symbol.name);
430 entry_symbol.name = buffer;
433 einfo (_("%P: warning: cannot find thumb start symbol %s\n"),
437 /* This is a convenient point to tell BFD about target specific flags.
438 After the output has been created, but before inputs are read. */
440 arm_elf_create_output_section_statements (void)
442 bfd_elf32_arm_set_target_relocs (link_info.output_bfd, &link_info,
444 target2_type, fix_v4bx, use_blx,
445 vfp11_denorm_fix, no_enum_size_warning,
446 no_wchar_size_warning,
449 stub_file = lang_add_input_file ("linker stubs",
450 lang_input_file_is_fake_enum,
452 stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd);
453 if (stub_file->the_bfd == NULL
454 || ! bfd_set_arch_mach (stub_file->the_bfd,
455 bfd_get_arch (link_info.output_bfd),
456 bfd_get_mach (link_info.output_bfd)))
458 einfo ("%X%P: can not create BFD %E\n");
462 stub_file->the_bfd->flags |= BFD_LINKER_CREATED;
463 ldlang_add_file (stub_file);
466 /* Avoid processing the fake stub_file in vercheck, stat_needed and
467 check_needed routines. */
469 static void (*real_func) (lang_input_statement_type *);
471 static void arm_for_each_input_file_wrapper (lang_input_statement_type *l)
478 arm_lang_for_each_input_file (void (*func) (lang_input_statement_type *))
481 lang_for_each_input_file (&arm_for_each_input_file_wrapper);
484 #define lang_for_each_input_file arm_lang_for_each_input_file
488 # Define some shell vars to insert bits of code into the standard elf
489 # parse_args and list_options functions.
491 PARSE_AND_LIST_PROLOGUE='
492 #define OPTION_THUMB_ENTRY 301
493 #define OPTION_BE8 302
494 #define OPTION_TARGET1_REL 303
495 #define OPTION_TARGET1_ABS 304
496 #define OPTION_TARGET2 305
497 #define OPTION_FIX_V4BX 306
498 #define OPTION_USE_BLX 307
499 #define OPTION_VFP11_DENORM_FIX 308
500 #define OPTION_NO_ENUM_SIZE_WARNING 309
501 #define OPTION_PIC_VENEER 310
502 #define OPTION_FIX_V4BX_INTERWORKING 311
503 #define OPTION_STUBGROUP_SIZE 312
504 #define OPTION_NO_WCHAR_SIZE_WARNING 313
507 PARSE_AND_LIST_SHORTOPTS=p
509 PARSE_AND_LIST_LONGOPTS='
510 { "no-pipeline-knowledge", no_argument, NULL, '\'p\''},
511 { "thumb-entry", required_argument, NULL, OPTION_THUMB_ENTRY},
512 { "be8", no_argument, NULL, OPTION_BE8},
513 { "target1-rel", no_argument, NULL, OPTION_TARGET1_REL},
514 { "target1-abs", no_argument, NULL, OPTION_TARGET1_ABS},
515 { "target2", required_argument, NULL, OPTION_TARGET2},
516 { "fix-v4bx", no_argument, NULL, OPTION_FIX_V4BX},
517 { "fix-v4bx-interworking", no_argument, NULL, OPTION_FIX_V4BX_INTERWORKING},
518 { "use-blx", no_argument, NULL, OPTION_USE_BLX},
519 { "vfp11-denorm-fix", required_argument, NULL, OPTION_VFP11_DENORM_FIX},
520 { "no-enum-size-warning", no_argument, NULL, OPTION_NO_ENUM_SIZE_WARNING},
521 { "pic-veneer", no_argument, NULL, OPTION_PIC_VENEER},
522 { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
523 { "no-wchar-size-warning", no_argument, NULL, OPTION_NO_WCHAR_SIZE_WARNING},
526 PARSE_AND_LIST_OPTIONS='
527 fprintf (file, _(" --thumb-entry=<sym> Set the entry point to be Thumb symbol <sym>\n"));
528 fprintf (file, _(" --be8 Oputput BE8 format image\n"));
529 fprintf (file, _(" --target1=rel Interpret R_ARM_TARGET1 as R_ARM_REL32\n"));
530 fprintf (file, _(" --target1=abs Interpret R_ARM_TARGET1 as R_ARM_ABS32\n"));
531 fprintf (file, _(" --target2=<type> Specify definition of R_ARM_TARGET2\n"));
532 fprintf (file, _(" --fix-v4bx Rewrite BX rn as MOV pc, rn for ARMv4\n"));
533 fprintf (file, _(" --fix-v4bx-interworking Rewrite BX rn branch to ARMv4 interworking veneer\n"));
534 fprintf (file, _(" --use-blx Enable use of BLX instructions\n"));
535 fprintf (file, _(" --vfp11-denorm-fix Specify how to fix VFP11 denorm erratum\n"));
536 fprintf (file, _(" --no-enum-size-warning Don'\''t warn about objects with incompatible"
538 fprintf (file, _(" --no-wchar-size-warning Don'\''t warn about objects with incompatible"
539 " wchar_t sizes\n"));
540 fprintf (file, _(" --pic-veneer Always generate PIC interworking veneers\n"));
542 --stub-group-size=N Maximum size of a group of input sections that can be\n\
543 handled by one stub section. A negative value\n\
544 locates all stubs before their branches (with a\n\
545 group size of -N), while a positive value allows\n\
546 two groups of input sections, one before, and one\n\
547 after each stub section. Values of +/-1 indicate\n\
548 the linker should choose suitable defaults.\n"
552 PARSE_AND_LIST_ARGS_CASES='
554 /* Only here for backwards compatibility. */
557 case OPTION_THUMB_ENTRY:
558 thumb_entry_symbol = optarg;
565 case OPTION_TARGET1_REL:
569 case OPTION_TARGET1_ABS:
574 target2_type = optarg;
577 case OPTION_FIX_V4BX:
581 case OPTION_FIX_V4BX_INTERWORKING:
589 case OPTION_VFP11_DENORM_FIX:
590 if (strcmp (optarg, "none") == 0)
591 vfp11_denorm_fix = BFD_ARM_VFP11_FIX_NONE;
592 else if (strcmp (optarg, "scalar") == 0)
593 vfp11_denorm_fix = BFD_ARM_VFP11_FIX_SCALAR;
594 else if (strcmp (optarg, "vector") == 0)
595 vfp11_denorm_fix = BFD_ARM_VFP11_FIX_VECTOR;
597 einfo (_("Unrecognized VFP11 fix type '\''%s'\''.\n"), optarg);
600 case OPTION_NO_ENUM_SIZE_WARNING:
601 no_enum_size_warning = 1;
604 case OPTION_NO_WCHAR_SIZE_WARNING:
605 no_wchar_size_warning = 1;
608 case OPTION_PIC_VENEER:
612 case OPTION_STUBGROUP_SIZE:
616 group_size = bfd_scan_vma (optarg, &end, 0);
618 einfo (_("%P%F: invalid number `%s'\''\n"), optarg);
623 # We have our own after_open and before_allocation functions, but they call
624 # the standard routines, so give them a different name.
625 LDEMUL_AFTER_OPEN=arm_elf_after_open
626 LDEMUL_BEFORE_ALLOCATION=arm_elf_before_allocation
627 LDEMUL_AFTER_ALLOCATION=arm_elf_after_allocation
628 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=arm_elf_create_output_section_statements
630 # Replace the elf before_parse function with our own.
631 LDEMUL_BEFORE_PARSE=gld"${EMULATION_NAME}"_before_parse
633 # Call the extra arm-elf function
634 LDEMUL_FINISH=gld${EMULATION_NAME}_finish