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 = "${TARGET2_TYPE}";
38 static int fix_v4bx = 0;
39 static int use_blx = 0;
40 static bfd_arm_vfp11_fix vfp11_denorm_fix = BFD_ARM_VFP11_FIX_DEFAULT;
41 static int no_enum_size_warning = 0;
42 static int pic_veneer = 0;
45 gld${EMULATION_NAME}_before_parse (void)
47 #ifndef TARGET_ /* I.e., if not generic. */
48 ldfile_set_output_arch ("`echo ${ARCH}`", bfd_arch_unknown);
49 #endif /* not TARGET_ */
50 config.dynamic_link = ${DYNAMIC_LINK-TRUE};
51 config.has_shared = `if test -n "$GENERATE_SHLIB_SCRIPT" ; then echo TRUE ; else echo FALSE ; fi`;
55 arm_elf_after_open (void)
57 if (strstr (bfd_get_target (link_info.output_bfd), "arm") == NULL)
59 /* The arm backend needs special fields in the output hash structure.
60 These will only be created if the output format is an arm format,
61 hence we do not support linking and changing output formats at the
62 same time. Use a link followed by objcopy to change output formats. */
63 einfo ("%F%X%P: error: cannot change output format whilst linking ARM binaries\n");
68 LANG_FOR_EACH_INPUT_STATEMENT (is)
70 bfd_elf32_arm_add_glue_sections_to_bfd (is->the_bfd, & link_info);
74 /* Call the standard elf routine. */
75 gld${EMULATION_NAME}_after_open ();
79 arm_elf_set_bfd_for_interworking (lang_statement_union_type *statement)
81 if (statement->header.type == lang_input_section_enum)
83 asection *i = statement->input_section.section;
85 if (!((lang_input_statement_type *) i->owner->usrdata)->just_syms_flag
86 && (i->flags & SEC_EXCLUDE) == 0)
88 asection *output_section = i->output_section;
90 ASSERT (output_section->owner == link_info.output_bfd);
92 /* Don't attach the interworking stubs to a dynamic object, to
93 an empty section, etc. */
94 if ((output_section->flags & SEC_HAS_CONTENTS) != 0
95 && (i->flags & SEC_NEVER_LOAD) == 0
96 && ! (i->owner->flags & DYNAMIC)
97 && ! i->owner->output_has_begun)
99 bfd_for_interwork = i->owner;
100 bfd_for_interwork->output_has_begun = TRUE;
107 arm_elf_before_allocation (void)
111 if (link_info.input_bfds != NULL)
113 /* The interworking bfd must be the last one in the link. */
114 bfd_for_interwork = NULL;
115 for (tem = link_info.input_bfds; tem != NULL; tem = tem->link_next)
116 tem->output_has_begun = FALSE;
118 lang_for_each_statement (arm_elf_set_bfd_for_interworking);
119 for (tem = link_info.input_bfds; tem != NULL; tem = tem->link_next)
120 tem->output_has_begun = FALSE;
122 /* If bfd_for_interwork is NULL, then there are no loadable sections
123 with real contents to be linked, so we are not going to have to
124 create any interworking stubs, so it is OK not to call
125 bfd_elf32_arm_get_bfd_for_interworking. */
126 if (bfd_for_interwork != NULL)
127 bfd_elf32_arm_get_bfd_for_interworking (bfd_for_interwork, &link_info);
130 bfd_elf32_arm_set_byteswap_code (&link_info, byteswap_code);
132 /* Choose type of VFP11 erratum fix, or warn if specified fix is unnecessary
133 due to architecture version. */
134 bfd_elf32_arm_set_vfp11_fix (link_info.output_bfd, &link_info);
136 /* We should be able to set the size of the interworking stub section. We
137 can't do it until later if we have dynamic sections, though. */
138 if (! elf_hash_table (&link_info)->dynamic_sections_created)
140 /* Here we rummage through the found bfds to collect glue information. */
141 LANG_FOR_EACH_INPUT_STATEMENT (is)
143 /* Initialise mapping tables for code/data. */
144 bfd_elf32_arm_init_maps (is->the_bfd);
146 if (!bfd_elf32_arm_process_before_allocation (is->the_bfd,
148 || !bfd_elf32_arm_vfp11_erratum_scan (is->the_bfd, &link_info))
149 /* xgettext:c-format */
150 einfo (_("Errors encountered processing file %s"), is->filename);
154 /* Call the standard elf routine. */
155 gld${EMULATION_NAME}_before_allocation ();
157 /* We have seen it all. Allocate it, and carry on. */
158 bfd_elf32_arm_allocate_interworking_sections (& link_info);
162 arm_elf_after_allocation (void)
164 /* Call the standard elf routine. */
165 after_allocation_default ();
168 LANG_FOR_EACH_INPUT_STATEMENT (is)
170 /* Figure out where VFP11 erratum veneers (and the labels returning
171 from same) have been placed. */
172 bfd_elf32_arm_vfp11_fix_veneer_locations (is->the_bfd, &link_info);
177 /* Fake input file for stubs. */
178 static lang_input_statement_type *stub_file;
180 /* Whether we need to call gldarm_layout_sections_again. */
181 static int need_laying_out = 0;
183 /* Maximum size of a group of input sections that can be handled by
184 one stub section. A value of +/-1 indicates the bfd back-end
185 should use a suitable default size. */
186 static bfd_signed_vma group_size = 1;
188 struct hook_stub_info
190 lang_statement_list_type add;
191 asection *input_section;
194 /* Traverse the linker tree to find the spot where the stub goes. */
197 hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp)
199 lang_statement_union_type *l;
202 for (; (l = *lp) != NULL; lp = &l->header.next)
204 switch (l->header.type)
206 case lang_constructors_statement_enum:
207 ret = hook_in_stub (info, &constructor_list.head);
212 case lang_output_section_statement_enum:
213 ret = hook_in_stub (info,
214 &l->output_section_statement.children.head);
219 case lang_wild_statement_enum:
220 ret = hook_in_stub (info, &l->wild_statement.children.head);
225 case lang_group_statement_enum:
226 ret = hook_in_stub (info, &l->group_statement.children.head);
231 case lang_input_section_enum:
232 if (l->input_section.section == info->input_section)
234 /* We've found our section. Insert the stub immediately
235 before its associated input section. */
236 *lp = info->add.head;
237 *(info->add.tail) = l;
242 case lang_data_statement_enum:
243 case lang_reloc_statement_enum:
244 case lang_object_symbols_statement_enum:
245 case lang_output_statement_enum:
246 case lang_target_statement_enum:
247 case lang_input_statement_enum:
248 case lang_assignment_statement_enum:
249 case lang_padding_statement_enum:
250 case lang_address_statement_enum:
251 case lang_fill_statement_enum:
263 /* Call-back for elf32_arm_size_stubs. */
265 /* Create a new stub section, and arrange for it to be linked
266 immediately before INPUT_SECTION. */
269 elf32_arm_add_stub_section (const char *stub_sec_name,
270 asection *input_section)
274 asection *output_section;
276 lang_output_section_statement_type *os;
277 struct hook_stub_info info;
279 stub_sec = bfd_make_section_anyway (stub_file->the_bfd, stub_sec_name);
280 if (stub_sec == NULL)
283 flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
284 | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
285 if (!bfd_set_section_flags (stub_file->the_bfd, stub_sec, flags))
288 bfd_set_section_alignment (stub_file->the_bfd, stub_sec, 3);
290 output_section = input_section->output_section;
291 secname = bfd_get_section_name (output_section->owner, output_section);
292 os = lang_output_section_find (secname);
294 info.input_section = input_section;
295 lang_list_init (&info.add);
296 lang_add_section (&info.add, stub_sec, os);
298 if (info.add.head == NULL)
301 if (hook_in_stub (&info, &os->children.head))
305 einfo ("%X%P: can not make stub section: %E\n");
309 /* Another call-back for elf_arm_size_stubs. */
312 gldarm_layout_sections_again (void)
314 /* If we have changed sizes of the stub sections, then we need
315 to recalculate all the section offsets. This may mean we need to
316 add even more stubs. */
317 gld${EMULATION_NAME}_map_segments (TRUE);
318 need_laying_out = -1;
322 build_section_lists (lang_statement_union_type *statement)
324 if (statement->header.type == lang_input_section_enum)
326 asection *i = statement->input_section.section;
328 if (!((lang_input_statement_type *) i->owner->usrdata)->just_syms_flag
329 && (i->flags & SEC_EXCLUDE) == 0
330 && i->output_section != NULL
331 && i->output_section->owner == link_info.output_bfd)
332 elf32_arm_next_input_section (& link_info, i);
337 gld${EMULATION_NAME}_finish (void)
339 struct bfd_link_hash_entry * h;
341 /* bfd_elf32_discard_info just plays with debugging sections,
342 ie. doesn't affect any code, so we can delay resizing the
343 sections. It's likely we'll resize everything in the process of
345 if (bfd_elf_discard_info (link_info.output_bfd, & link_info))
348 /* If generating a relocatable output file, then we don't
349 have to examine the relocs. */
350 if (stub_file != NULL && !link_info.relocatable)
352 int ret = elf32_arm_setup_section_lists (link_info.output_bfd, & link_info);
358 einfo ("%X%P: could not compute sections lists for stub generation: %E\n");
362 lang_for_each_statement (build_section_lists);
364 /* Call into the BFD backend to do the real work. */
365 if (! elf32_arm_size_stubs (link_info.output_bfd,
369 & elf32_arm_add_stub_section,
370 & gldarm_layout_sections_again))
372 einfo ("%X%P: cannot size stub section: %E\n");
378 if (need_laying_out != -1)
379 gld${EMULATION_NAME}_map_segments (need_laying_out);
381 if (! link_info.relocatable)
383 /* Now build the linker stubs. */
384 if (stub_file->the_bfd->sections != NULL)
386 if (! elf32_arm_build_stubs (& link_info))
387 einfo ("%X%P: can not build stubs: %E\n");
393 if (thumb_entry_symbol)
395 h = bfd_link_hash_lookup (link_info.hash, thumb_entry_symbol,
400 struct elf_link_hash_entry * eh;
402 if (!entry_symbol.name)
405 h = bfd_link_hash_lookup (link_info.hash, entry_symbol.name,
407 eh = (struct elf_link_hash_entry *)h;
408 if (!h || ELF_ST_TYPE(eh->type) != STT_ARM_TFUNC)
413 if (h != (struct bfd_link_hash_entry *) NULL
414 && (h->type == bfd_link_hash_defined
415 || h->type == bfd_link_hash_defweak)
416 && h->u.def.section->output_section != NULL)
418 static char buffer[32];
421 /* Special procesing is required for a Thumb entry symbol. The
422 bottom bit of its address must be set. */
423 val = (h->u.def.value
424 + bfd_get_section_vma (link_info.output_bfd,
425 h->u.def.section->output_section)
426 + h->u.def.section->output_offset);
430 /* Now convert this value into a string and store it in entry_symbol
431 where the lang_finish() function will pick it up. */
435 sprintf_vma (buffer + 2, val);
437 if (thumb_entry_symbol != NULL && entry_symbol.name != NULL
438 && entry_from_cmdline)
439 einfo (_("%P: warning: '--thumb-entry %s' is overriding '-e %s'\n"),
440 thumb_entry_symbol, entry_symbol.name);
441 entry_symbol.name = buffer;
444 einfo (_("%P: warning: cannot find thumb start symbol %s\n"),
448 /* This is a convenient point to tell BFD about target specific flags.
449 After the output has been created, but before inputs are read. */
451 arm_elf_create_output_section_statements (void)
453 bfd_elf32_arm_set_target_relocs (link_info.output_bfd, &link_info,
455 target2_type, fix_v4bx, use_blx,
456 vfp11_denorm_fix, no_enum_size_warning,
459 stub_file = lang_add_input_file ("linker stubs",
460 lang_input_file_is_fake_enum,
462 stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd);
463 if (stub_file->the_bfd == NULL
464 || ! bfd_set_arch_mach (stub_file->the_bfd,
465 bfd_get_arch (link_info.output_bfd),
466 bfd_get_mach (link_info.output_bfd)))
468 einfo ("%X%P: can not create BFD %E\n");
472 stub_file->the_bfd->flags |= BFD_LINKER_CREATED;
473 ldlang_add_file (stub_file);
476 /* Avoid processing the fake stub_file in vercheck, stat_needed and
477 check_needed routines. */
479 static void (*real_func) (lang_input_statement_type *);
481 static void arm_for_each_input_file_wrapper (lang_input_statement_type *l)
488 arm_lang_for_each_input_file (void (*func) (lang_input_statement_type *))
491 lang_for_each_input_file (&arm_for_each_input_file_wrapper);
494 #define lang_for_each_input_file arm_lang_for_each_input_file
498 # Define some shell vars to insert bits of code into the standard elf
499 # parse_args and list_options functions.
501 PARSE_AND_LIST_PROLOGUE='
502 #define OPTION_THUMB_ENTRY 301
503 #define OPTION_BE8 302
504 #define OPTION_TARGET1_REL 303
505 #define OPTION_TARGET1_ABS 304
506 #define OPTION_TARGET2 305
507 #define OPTION_FIX_V4BX 306
508 #define OPTION_USE_BLX 307
509 #define OPTION_VFP11_DENORM_FIX 308
510 #define OPTION_NO_ENUM_SIZE_WARNING 309
511 #define OPTION_PIC_VENEER 310
512 #define OPTION_FIX_V4BX_INTERWORKING 311
513 #define OPTION_STUBGROUP_SIZE 312
516 PARSE_AND_LIST_SHORTOPTS=p
518 PARSE_AND_LIST_LONGOPTS='
519 { "no-pipeline-knowledge", no_argument, NULL, '\'p\''},
520 { "thumb-entry", required_argument, NULL, OPTION_THUMB_ENTRY},
521 { "be8", no_argument, NULL, OPTION_BE8},
522 { "target1-rel", no_argument, NULL, OPTION_TARGET1_REL},
523 { "target1-abs", no_argument, NULL, OPTION_TARGET1_ABS},
524 { "target2", required_argument, NULL, OPTION_TARGET2},
525 { "fix-v4bx", no_argument, NULL, OPTION_FIX_V4BX},
526 { "fix-v4bx-interworking", no_argument, NULL, OPTION_FIX_V4BX_INTERWORKING},
527 { "use-blx", no_argument, NULL, OPTION_USE_BLX},
528 { "vfp11-denorm-fix", required_argument, NULL, OPTION_VFP11_DENORM_FIX},
529 { "no-enum-size-warning", no_argument, NULL, OPTION_NO_ENUM_SIZE_WARNING},
530 { "pic-veneer", no_argument, NULL, OPTION_PIC_VENEER},
531 { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
534 PARSE_AND_LIST_OPTIONS='
535 fprintf (file, _(" --thumb-entry=<sym> Set the entry point to be Thumb symbol <sym>\n"));
536 fprintf (file, _(" --be8 Oputput BE8 format image\n"));
537 fprintf (file, _(" --target1=rel Interpret R_ARM_TARGET1 as R_ARM_REL32\n"));
538 fprintf (file, _(" --target1=abs Interpret R_ARM_TARGET1 as R_ARM_ABS32\n"));
539 fprintf (file, _(" --target2=<type> Specify definition of R_ARM_TARGET2\n"));
540 fprintf (file, _(" --fix-v4bx Rewrite BX rn as MOV pc, rn for ARMv4\n"));
541 fprintf (file, _(" --fix-v4bx-interworking Rewrite BX rn branch to ARMv4 interworking veneer\n"));
542 fprintf (file, _(" --use-blx Enable use of BLX instructions\n"));
543 fprintf (file, _(" --vfp11-denorm-fix Specify how to fix VFP11 denorm erratum\n"));
544 fprintf (file, _(" --no-enum-size-warning Don'\''t warn about objects with incompatible"
546 fprintf (file, _(" --pic-veneer Always generate PIC interworking veneers\n"));
548 --stub-group-size=N Maximum size of a group of input sections that can be\n\
549 handled by one stub section. A negative value\n\
550 locates all stubs before their branches (with a\n\
551 group size of -N), while a positive value allows\n\
552 two groups of input sections, one before, and one\n\
553 after each stub section. Values of +/-1 indicate\n\
554 the linker should choose suitable defaults.\n"
558 PARSE_AND_LIST_ARGS_CASES='
560 /* Only here for backwards compatibility. */
563 case OPTION_THUMB_ENTRY:
564 thumb_entry_symbol = optarg;
571 case OPTION_TARGET1_REL:
575 case OPTION_TARGET1_ABS:
580 target2_type = optarg;
583 case OPTION_FIX_V4BX:
587 case OPTION_FIX_V4BX_INTERWORKING:
595 case OPTION_VFP11_DENORM_FIX:
596 if (strcmp (optarg, "none") == 0)
597 vfp11_denorm_fix = BFD_ARM_VFP11_FIX_NONE;
598 else if (strcmp (optarg, "scalar") == 0)
599 vfp11_denorm_fix = BFD_ARM_VFP11_FIX_SCALAR;
600 else if (strcmp (optarg, "vector") == 0)
601 vfp11_denorm_fix = BFD_ARM_VFP11_FIX_VECTOR;
603 einfo (_("Unrecognized VFP11 fix type '\''%s'\''.\n"), optarg);
606 case OPTION_NO_ENUM_SIZE_WARNING:
607 no_enum_size_warning = 1;
610 case OPTION_PIC_VENEER:
614 case OPTION_STUBGROUP_SIZE:
618 group_size = bfd_scan_vma (optarg, &end, 0);
620 einfo (_("%P%F: invalid number `%s'\''\n"), optarg);
625 # We have our own after_open and before_allocation functions, but they call
626 # the standard routines, so give them a different name.
627 LDEMUL_AFTER_OPEN=arm_elf_after_open
628 LDEMUL_BEFORE_ALLOCATION=arm_elf_before_allocation
629 LDEMUL_AFTER_ALLOCATION=arm_elf_after_allocation
630 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=arm_elf_create_output_section_statements
632 # Replace the elf before_parse function with our own.
633 LDEMUL_BEFORE_PARSE=gld"${EMULATION_NAME}"_before_parse
635 # Call the extra arm-elf function
636 LDEMUL_FINISH=gld${EMULATION_NAME}_finish