1 # This shell script emits a C file. -*- C -*-
2 # Copyright (C) 2009-2016 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${SEPARATE_CODE}" = xyes ; then echo TRUE ; else echo FALSE ; fi`;
46 link_info.relro = DEFAULT_LD_Z_RELRO;
50 aarch64_elf_before_allocation (void)
52 /* We should be able to set the size of the interworking stub section. We
53 can't do it until later if we have dynamic sections, though. */
54 if (! elf_hash_table (&link_info)->dynamic_sections_created)
56 /* Here we rummage through the found bfds to collect information. */
57 LANG_FOR_EACH_INPUT_STATEMENT (is)
59 /* Initialise mapping tables for code/data. */
60 bfd_elf${ELFSIZE}_aarch64_init_maps (is->the_bfd);
64 /* Call the standard elf routine. */
65 gld${EMULATION_NAME}_before_allocation ();
68 /* Fake input file for stubs. */
69 static lang_input_statement_type *stub_file;
71 /* Whether we need to call gldarm_layout_sections_again. */
72 static int need_laying_out = 0;
74 /* Maximum size of a group of input sections that can be handled by
75 one stub section. A value of +/-1 indicates the bfd back-end
76 should use a suitable default size. */
77 static bfd_signed_vma group_size = 1;
81 lang_statement_list_type add;
82 asection *input_section;
85 /* Traverse the linker tree to find the spot where the stub goes. */
88 hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp)
90 lang_statement_union_type *l;
93 for (; (l = *lp) != NULL; lp = &l->header.next)
95 switch (l->header.type)
97 case lang_constructors_statement_enum:
98 ret = hook_in_stub (info, &constructor_list.head);
103 case lang_output_section_statement_enum:
104 ret = hook_in_stub (info,
105 &l->output_section_statement.children.head);
110 case lang_wild_statement_enum:
111 ret = hook_in_stub (info, &l->wild_statement.children.head);
116 case lang_group_statement_enum:
117 ret = hook_in_stub (info, &l->group_statement.children.head);
122 case lang_input_section_enum:
123 if (l->input_section.section == info->input_section)
125 /* We've found our section. Insert the stub immediately
126 after its associated input section. */
127 *(info->add.tail) = l->header.next;
128 l->header.next = info->add.head;
133 case lang_data_statement_enum:
134 case lang_reloc_statement_enum:
135 case lang_object_symbols_statement_enum:
136 case lang_output_statement_enum:
137 case lang_target_statement_enum:
138 case lang_input_statement_enum:
139 case lang_assignment_statement_enum:
140 case lang_padding_statement_enum:
141 case lang_address_statement_enum:
142 case lang_fill_statement_enum:
154 /* Call-back for elf${ELFSIZE}_aarch64_size_stubs. */
156 /* Create a new stub section, and arrange for it to be linked
157 immediately after INPUT_SECTION. */
160 elf${ELFSIZE}_aarch64_add_stub_section (const char *stub_sec_name,
161 asection *input_section)
165 asection *output_section;
166 lang_output_section_statement_type *os;
167 struct hook_stub_info info;
169 flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
170 | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
171 stub_sec = bfd_make_section_anyway_with_flags (stub_file->the_bfd,
172 stub_sec_name, flags);
173 if (stub_sec == NULL)
176 bfd_set_section_alignment (stub_file->the_bfd, stub_sec, 2);
178 output_section = input_section->output_section;
179 os = lang_output_section_get (output_section);
181 info.input_section = input_section;
182 lang_list_init (&info.add);
183 lang_add_section (&info.add, stub_sec, NULL, os);
185 if (info.add.head == NULL)
188 if (hook_in_stub (&info, &os->children.head))
192 einfo ("%X%P: can not make stub section: %E\n");
196 /* Another call-back for elf${ELFSIZE}_aarch64_size_stubs. */
199 gldaarch64_layout_sections_again (void)
201 /* If we have changed sizes of the stub sections, then we need
202 to recalculate all the section offsets. This may mean we need to
203 add even more stubs. */
204 gld${EMULATION_NAME}_map_segments (TRUE);
205 need_laying_out = -1;
209 build_section_lists (lang_statement_union_type *statement)
211 if (statement->header.type == lang_input_section_enum)
213 asection *i = statement->input_section.section;
215 if (!((lang_input_statement_type *) i->owner->usrdata)->flags.just_syms
216 && (i->flags & SEC_EXCLUDE) == 0
217 && i->output_section != NULL
218 && i->output_section->owner == link_info.output_bfd)
219 elf${ELFSIZE}_aarch64_next_input_section (& link_info, i);
224 gld${EMULATION_NAME}_after_allocation (void)
228 /* bfd_elf32_discard_info just plays with debugging sections,
229 ie. doesn't affect any code, so we can delay resizing the
230 sections. It's likely we'll resize everything in the process of
232 ret = bfd_elf_discard_info (link_info.output_bfd, & link_info);
235 einfo ("%X%P: .eh_frame/.stab edit: %E\n");
241 /* If generating a relocatable output file, then we don't
242 have to examine the relocs. */
243 if (stub_file != NULL && !bfd_link_relocatable (&link_info))
245 ret = elf${ELFSIZE}_aarch64_setup_section_lists (link_info.output_bfd,
251 einfo ("%X%P: could not compute sections lists for stub generation: %E\n");
255 lang_for_each_statement (build_section_lists);
257 /* Call into the BFD backend to do the real work. */
258 if (! elf${ELFSIZE}_aarch64_size_stubs (link_info.output_bfd,
262 & elf${ELFSIZE}_aarch64_add_stub_section,
263 & gldaarch64_layout_sections_again))
265 einfo ("%X%P: cannot size stub section: %E\n");
271 if (need_laying_out != -1)
272 gld${EMULATION_NAME}_map_segments (need_laying_out);
276 gld${EMULATION_NAME}_finish (void)
278 if (!bfd_link_relocatable (&link_info))
280 /* Now build the linker stubs. */
281 if (stub_file->the_bfd->sections != NULL)
283 if (! elf${ELFSIZE}_aarch64_build_stubs (& link_info))
284 einfo ("%X%P: can not build stubs: %E\n");
291 /* This is a convenient point to tell BFD about target specific flags.
292 After the output has been created, but before inputs are read. */
294 aarch64_elf_create_output_section_statements (void)
296 if (strstr (bfd_get_target (link_info.output_bfd), "aarch64") == NULL)
298 /* The arm backend needs special fields in the output hash structure.
299 These will only be created if the output format is an arm format,
300 hence we do not support linking and changing output formats at the
301 same time. Use a link followed by objcopy to change output formats. */
302 einfo ("%F%X%P: error: Cannot change output format whilst linking AArch64 binaries.\n");
306 bfd_elf${ELFSIZE}_aarch64_set_options (link_info.output_bfd, &link_info,
307 no_enum_size_warning,
308 no_wchar_size_warning,
310 fix_erratum_835769, fix_erratum_843419,
311 no_apply_dynamic_relocs);
313 stub_file = lang_add_input_file ("linker stubs",
314 lang_input_file_is_fake_enum,
316 stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd);
317 if (stub_file->the_bfd == NULL
318 || ! bfd_set_arch_mach (stub_file->the_bfd,
319 bfd_get_arch (link_info.output_bfd),
320 bfd_get_mach (link_info.output_bfd)))
322 einfo ("%X%P: can not create BFD %E\n");
326 stub_file->the_bfd->flags |= BFD_LINKER_CREATED;
327 ldlang_add_file (stub_file);
330 /* Avoid processing the fake stub_file in vercheck, stat_needed and
331 check_needed routines. */
333 static void (*real_func) (lang_input_statement_type *);
335 static void aarch64_for_each_input_file_wrapper (lang_input_statement_type *l)
342 aarch64_lang_for_each_input_file (void (*func) (lang_input_statement_type *))
345 lang_for_each_input_file (&aarch64_for_each_input_file_wrapper);
348 #define lang_for_each_input_file aarch64_lang_for_each_input_file
352 # Define some shell vars to insert bits of code into the standard elf
353 # parse_args and list_options functions.
355 PARSE_AND_LIST_PROLOGUE='
356 #define OPTION_NO_ENUM_SIZE_WARNING 309
357 #define OPTION_PIC_VENEER 310
358 #define OPTION_STUBGROUP_SIZE 311
359 #define OPTION_NO_WCHAR_SIZE_WARNING 312
360 #define OPTION_FIX_ERRATUM_835769 313
361 #define OPTION_FIX_ERRATUM_843419 314
362 #define OPTION_NO_APPLY_DYNAMIC_RELOCS 315
365 PARSE_AND_LIST_SHORTOPTS=p
367 PARSE_AND_LIST_LONGOPTS='
368 { "no-pipeline-knowledge", no_argument, NULL, '\'p\''},
369 { "no-enum-size-warning", no_argument, NULL, OPTION_NO_ENUM_SIZE_WARNING},
370 { "pic-veneer", no_argument, NULL, OPTION_PIC_VENEER},
371 { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
372 { "no-wchar-size-warning", no_argument, NULL, OPTION_NO_WCHAR_SIZE_WARNING},
373 { "fix-cortex-a53-835769", no_argument, NULL, OPTION_FIX_ERRATUM_835769},
374 { "fix-cortex-a53-843419", no_argument, NULL, OPTION_FIX_ERRATUM_843419},
375 { "no-apply-dynamic-relocs", no_argument, NULL, OPTION_NO_APPLY_DYNAMIC_RELOCS},
378 PARSE_AND_LIST_OPTIONS='
379 fprintf (file, _(" --no-enum-size-warning Don'\''t warn about objects with incompatible\n"
381 fprintf (file, _(" --no-wchar-size-warning Don'\''t warn about objects with incompatible"
382 " wchar_t sizes\n"));
383 fprintf (file, _(" --pic-veneer Always generate PIC interworking veneers\n"));
385 --stub-group-size=N Maximum size of a group of input sections that can be\n\
386 handled by one stub section. A negative value\n\
387 locates all stubs after their branches (with a\n\
388 group size of -N), while a positive value allows\n\
389 two groups of input sections, one before, and one\n\
390 after each stub section. Values of +/-1 indicate\n\
391 the linker should choose suitable defaults.\n"
393 fprintf (file, _(" --fix-cortex-a53-835769 Fix erratum 835769\n"));
394 fprintf (file, _(" --fix-cortex-a53-843419 Fix erratum 843419\n"));
395 fprintf (file, _(" --no-apply-dynamic-relocs Do not apply link-time values for dynamic relocations\n"));
398 PARSE_AND_LIST_ARGS_CASES='
400 /* Only here for backwards compatibility. */
403 case OPTION_NO_ENUM_SIZE_WARNING:
404 no_enum_size_warning = 1;
407 case OPTION_NO_WCHAR_SIZE_WARNING:
408 no_wchar_size_warning = 1;
411 case OPTION_PIC_VENEER:
415 case OPTION_FIX_ERRATUM_835769:
416 fix_erratum_835769 = 1;
419 case OPTION_FIX_ERRATUM_843419:
420 fix_erratum_843419 = 1;
423 case OPTION_NO_APPLY_DYNAMIC_RELOCS:
424 no_apply_dynamic_relocs = 1;
427 case OPTION_STUBGROUP_SIZE:
431 group_size = bfd_scan_vma (optarg, &end, 0);
433 einfo (_("%P%F: invalid number `%s'\''\n"), optarg);
438 # We have our own before_allocation etc. functions, but they call
439 # the standard routines, so give them a different name.
440 LDEMUL_BEFORE_ALLOCATION=aarch64_elf_before_allocation
441 LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
442 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=aarch64_elf_create_output_section_statements
444 # Replace the elf before_parse function with our own.
445 LDEMUL_BEFORE_PARSE=gld"${EMULATION_NAME}"_before_parse
447 # Call the extra arm-elf function
448 LDEMUL_FINISH=gld${EMULATION_NAME}_finish