1 # This shell script emits a C file. -*- C -*-
2 # Copyright (C) 2009-2018 Free Software Foundation, Inc.
3 # Contributed by ARM Ltd.
5 # This file is part of the GNU Binutils.
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 3 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; see the file COPYING3. If not,
19 # see <http://www.gnu.org/licenses/>.
22 # This file is sourced from elf32.em, and defines extra aarch64-elf
28 #include "elf/aarch64.h"
30 static int no_enum_size_warning = 0;
31 static int no_wchar_size_warning = 0;
32 static int pic_veneer = 0;
33 static int fix_erratum_835769 = 0;
34 static int fix_erratum_843419 = 0;
35 static int no_apply_dynamic_relocs = 0;
38 gld${EMULATION_NAME}_before_parse (void)
40 #ifndef TARGET_ /* I.e., if not generic. */
41 ldfile_set_output_arch ("`echo ${ARCH}`", bfd_arch_unknown);
42 #endif /* not TARGET_ */
43 input_flags.dynamic = ${DYNAMIC_LINK-TRUE};
44 config.has_shared = `if test -n "$GENERATE_SHLIB_SCRIPT" ; then echo TRUE ; else echo FALSE ; fi`;
45 config.separate_code = `if test "x${SEPARATE_CODE}" = xyes ; then echo TRUE ; else echo FALSE ; fi`;
46 link_info.check_relocs_after_open_input = TRUE;
47 link_info.relro = DEFAULT_LD_Z_RELRO;
51 aarch64_elf_before_allocation (void)
53 /* We should be able to set the size of the interworking stub section. We
54 can't do it until later if we have dynamic sections, though. */
55 if (! elf_hash_table (&link_info)->dynamic_sections_created)
57 /* Here we rummage through the found bfds to collect information. */
58 LANG_FOR_EACH_INPUT_STATEMENT (is)
60 /* Initialise mapping tables for code/data. */
61 bfd_elf${ELFSIZE}_aarch64_init_maps (is->the_bfd);
65 /* Call the standard elf routine. */
66 gld${EMULATION_NAME}_before_allocation ();
69 /* Fake input file for stubs. */
70 static lang_input_statement_type *stub_file;
72 /* Whether we need to call gldarm_layout_sections_again. */
73 static int need_laying_out = 0;
75 /* Maximum size of a group of input sections that can be handled by
76 one stub section. A value of +/-1 indicates the bfd back-end
77 should use a suitable default size. */
78 static bfd_signed_vma group_size = 1;
82 lang_statement_list_type add;
83 asection *input_section;
86 /* Traverse the linker tree to find the spot where the stub goes. */
89 hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp)
91 lang_statement_union_type *l;
94 for (; (l = *lp) != NULL; lp = &l->header.next)
96 switch (l->header.type)
98 case lang_constructors_statement_enum:
99 ret = hook_in_stub (info, &constructor_list.head);
104 case lang_output_section_statement_enum:
105 ret = hook_in_stub (info,
106 &l->output_section_statement.children.head);
111 case lang_wild_statement_enum:
112 ret = hook_in_stub (info, &l->wild_statement.children.head);
117 case lang_group_statement_enum:
118 ret = hook_in_stub (info, &l->group_statement.children.head);
123 case lang_input_section_enum:
124 if (l->input_section.section == info->input_section)
126 /* We've found our section. Insert the stub immediately
127 after its associated input section. */
128 *(info->add.tail) = l->header.next;
129 l->header.next = info->add.head;
134 case lang_data_statement_enum:
135 case lang_reloc_statement_enum:
136 case lang_object_symbols_statement_enum:
137 case lang_output_statement_enum:
138 case lang_target_statement_enum:
139 case lang_input_statement_enum:
140 case lang_assignment_statement_enum:
141 case lang_padding_statement_enum:
142 case lang_address_statement_enum:
143 case lang_fill_statement_enum:
155 /* Call-back for elf${ELFSIZE}_aarch64_size_stubs. */
157 /* Create a new stub section, and arrange for it to be linked
158 immediately after INPUT_SECTION. */
161 elf${ELFSIZE}_aarch64_add_stub_section (const char *stub_sec_name,
162 asection *input_section)
166 asection *output_section;
167 lang_output_section_statement_type *os;
168 struct hook_stub_info info;
170 flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
171 | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
172 stub_sec = bfd_make_section_anyway_with_flags (stub_file->the_bfd,
173 stub_sec_name, flags);
174 if (stub_sec == NULL)
177 /* Long branch stubs contain a 64-bit address, so the section requires
179 bfd_set_section_alignment (stub_file->the_bfd, stub_sec, 3);
181 output_section = input_section->output_section;
182 os = lang_output_section_get (output_section);
184 info.input_section = input_section;
185 lang_list_init (&info.add);
186 lang_add_section (&info.add, stub_sec, NULL, os);
188 if (info.add.head == NULL)
191 if (hook_in_stub (&info, &os->children.head))
195 einfo (_("%X%P: can not make stub section: %E\n"));
199 /* Another call-back for elf${ELFSIZE}_aarch64_size_stubs. */
202 gldaarch64_layout_sections_again (void)
204 /* If we have changed sizes of the stub sections, then we need
205 to recalculate all the section offsets. This may mean we need to
206 add even more stubs. */
207 gld${EMULATION_NAME}_map_segments (TRUE);
208 need_laying_out = -1;
212 build_section_lists (lang_statement_union_type *statement)
214 if (statement->header.type == lang_input_section_enum)
216 asection *i = statement->input_section.section;
218 if (!((lang_input_statement_type *) i->owner->usrdata)->flags.just_syms
219 && (i->flags & SEC_EXCLUDE) == 0
220 && i->output_section != NULL
221 && i->output_section->owner == link_info.output_bfd)
222 elf${ELFSIZE}_aarch64_next_input_section (& link_info, i);
227 gld${EMULATION_NAME}_after_allocation (void)
231 /* bfd_elf32_discard_info just plays with debugging sections,
232 ie. doesn't affect any code, so we can delay resizing the
233 sections. It's likely we'll resize everything in the process of
235 ret = bfd_elf_discard_info (link_info.output_bfd, & link_info);
238 einfo (_("%X%P: .eh_frame/.stab edit: %E\n"));
244 /* If generating a relocatable output file, then we don't
245 have to examine the relocs. */
246 if (stub_file != NULL && !bfd_link_relocatable (&link_info))
248 ret = elf${ELFSIZE}_aarch64_setup_section_lists (link_info.output_bfd,
254 einfo (_("%X%P: could not compute sections lists "
255 "for stub generation: %E\n"));
259 lang_for_each_statement (build_section_lists);
261 /* Call into the BFD backend to do the real work. */
262 if (! elf${ELFSIZE}_aarch64_size_stubs (link_info.output_bfd,
266 & elf${ELFSIZE}_aarch64_add_stub_section,
267 & gldaarch64_layout_sections_again))
269 einfo (_("%X%P: can not size stub section: %E\n"));
275 if (need_laying_out != -1)
276 gld${EMULATION_NAME}_map_segments (need_laying_out);
280 gld${EMULATION_NAME}_finish (void)
282 if (!bfd_link_relocatable (&link_info))
284 /* Now build the linker stubs. */
285 if (stub_file->the_bfd->sections != NULL)
287 if (! elf${ELFSIZE}_aarch64_build_stubs (& link_info))
288 einfo (_("%X%P: can not build stubs: %E\n"));
295 /* This is a convenient point to tell BFD about target specific flags.
296 After the output has been created, but before inputs are read. */
298 aarch64_elf_create_output_section_statements (void)
300 if (strstr (bfd_get_target (link_info.output_bfd), "aarch64") == NULL)
302 /* The arm backend needs special fields in the output hash structure.
303 These will only be created if the output format is an arm format,
304 hence we do not support linking and changing output formats at the
305 same time. Use a link followed by objcopy to change output formats. */
306 einfo (_("%F%P: error: cannot change output format "
307 "whilst linking %s binaries\n"), "AArch64");
311 bfd_elf${ELFSIZE}_aarch64_set_options (link_info.output_bfd, &link_info,
312 no_enum_size_warning,
313 no_wchar_size_warning,
315 fix_erratum_835769, fix_erratum_843419,
316 no_apply_dynamic_relocs);
318 stub_file = lang_add_input_file ("linker stubs",
319 lang_input_file_is_fake_enum,
321 stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd);
322 if (stub_file->the_bfd == NULL
323 || ! bfd_set_arch_mach (stub_file->the_bfd,
324 bfd_get_arch (link_info.output_bfd),
325 bfd_get_mach (link_info.output_bfd)))
327 einfo (_("%F%P: can not create BFD: %E\n"));
331 stub_file->the_bfd->flags |= BFD_LINKER_CREATED;
332 ldlang_add_file (stub_file);
335 /* Avoid processing the fake stub_file in vercheck, stat_needed and
336 check_needed routines. */
338 static void (*real_func) (lang_input_statement_type *);
340 static void aarch64_for_each_input_file_wrapper (lang_input_statement_type *l)
347 aarch64_lang_for_each_input_file (void (*func) (lang_input_statement_type *))
350 lang_for_each_input_file (&aarch64_for_each_input_file_wrapper);
353 #define lang_for_each_input_file aarch64_lang_for_each_input_file
357 # Define some shell vars to insert bits of code into the standard elf
358 # parse_args and list_options functions.
360 PARSE_AND_LIST_PROLOGUE='
361 #define OPTION_NO_ENUM_SIZE_WARNING 309
362 #define OPTION_PIC_VENEER 310
363 #define OPTION_STUBGROUP_SIZE 311
364 #define OPTION_NO_WCHAR_SIZE_WARNING 312
365 #define OPTION_FIX_ERRATUM_835769 313
366 #define OPTION_FIX_ERRATUM_843419 314
367 #define OPTION_NO_APPLY_DYNAMIC_RELOCS 315
370 PARSE_AND_LIST_SHORTOPTS=p
372 PARSE_AND_LIST_LONGOPTS='
373 { "no-pipeline-knowledge", no_argument, NULL, '\'p\''},
374 { "no-enum-size-warning", no_argument, NULL, OPTION_NO_ENUM_SIZE_WARNING},
375 { "pic-veneer", no_argument, NULL, OPTION_PIC_VENEER},
376 { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
377 { "no-wchar-size-warning", no_argument, NULL, OPTION_NO_WCHAR_SIZE_WARNING},
378 { "fix-cortex-a53-835769", no_argument, NULL, OPTION_FIX_ERRATUM_835769},
379 { "fix-cortex-a53-843419", no_argument, NULL, OPTION_FIX_ERRATUM_843419},
380 { "no-apply-dynamic-relocs", no_argument, NULL, OPTION_NO_APPLY_DYNAMIC_RELOCS},
383 PARSE_AND_LIST_OPTIONS='
384 fprintf (file, _(" --no-enum-size-warning Don'\''t warn about objects with incompatible\n"
386 fprintf (file, _(" --no-wchar-size-warning Don'\''t warn about objects with incompatible"
387 " wchar_t sizes\n"));
388 fprintf (file, _(" --pic-veneer Always generate PIC interworking veneers\n"));
390 --stub-group-size=N Maximum size of a group of input sections that\n\
391 can be handled by one stub section. A negative\n\
392 value locates all stubs after their branches\n\
393 (with a group size of -N), while a positive\n\
394 value allows two groups of input sections, one\n\
395 before, and one after each stub section.\n\
396 Values of +/-1 indicate the linker should\n\
397 choose suitable defaults.\n"));
398 fprintf (file, _(" --fix-cortex-a53-835769 Fix erratum 835769\n"));
399 fprintf (file, _(" --fix-cortex-a53-843419 Fix erratum 843419\n"));
400 fprintf (file, _(" --no-apply-dynamic-relocs Do not apply link-time values for dynamic relocations\n"));
403 PARSE_AND_LIST_ARGS_CASES='
405 /* Only here for backwards compatibility. */
408 case OPTION_NO_ENUM_SIZE_WARNING:
409 no_enum_size_warning = 1;
412 case OPTION_NO_WCHAR_SIZE_WARNING:
413 no_wchar_size_warning = 1;
416 case OPTION_PIC_VENEER:
420 case OPTION_FIX_ERRATUM_835769:
421 fix_erratum_835769 = 1;
424 case OPTION_FIX_ERRATUM_843419:
425 fix_erratum_843419 = 1;
428 case OPTION_NO_APPLY_DYNAMIC_RELOCS:
429 no_apply_dynamic_relocs = 1;
432 case OPTION_STUBGROUP_SIZE:
436 group_size = bfd_scan_vma (optarg, &end, 0);
438 einfo (_("%F%P: invalid number `%s'\''\n"), optarg);
443 # We have our own before_allocation etc. functions, but they call
444 # the standard routines, so give them a different name.
445 LDEMUL_BEFORE_ALLOCATION=aarch64_elf_before_allocation
446 LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
447 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=aarch64_elf_create_output_section_statements
449 # Replace the elf before_parse function with our own.
450 LDEMUL_BEFORE_PARSE=gld"${EMULATION_NAME}"_before_parse
452 # Call the extra arm-elf function
453 LDEMUL_FINISH=gld${EMULATION_NAME}_finish