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;
37 gld${EMULATION_NAME}_before_parse (void)
39 #ifndef TARGET_ /* I.e., if not generic. */
40 ldfile_set_output_arch ("`echo ${ARCH}`", bfd_arch_unknown);
41 #endif /* not TARGET_ */
42 input_flags.dynamic = ${DYNAMIC_LINK-TRUE};
43 config.has_shared = `if test -n "$GENERATE_SHLIB_SCRIPT" ; then echo TRUE ; else echo FALSE ; fi`;
44 config.separate_code = `if test "x${SEPARATE_CODE}" = xyes ; then echo TRUE ; else echo FALSE ; fi`;
48 aarch64_elf_before_allocation (void)
50 /* We should be able to set the size of the interworking stub section. We
51 can't do it until later if we have dynamic sections, though. */
52 if (! elf_hash_table (&link_info)->dynamic_sections_created)
54 /* Here we rummage through the found bfds to collect information. */
55 LANG_FOR_EACH_INPUT_STATEMENT (is)
57 /* Initialise mapping tables for code/data. */
58 bfd_elf${ELFSIZE}_aarch64_init_maps (is->the_bfd);
62 /* Call the standard elf routine. */
63 gld${EMULATION_NAME}_before_allocation ();
66 /* Fake input file for stubs. */
67 static lang_input_statement_type *stub_file;
69 /* Whether we need to call gldarm_layout_sections_again. */
70 static int need_laying_out = 0;
72 /* Maximum size of a group of input sections that can be handled by
73 one stub section. A value of +/-1 indicates the bfd back-end
74 should use a suitable default size. */
75 static bfd_signed_vma group_size = 1;
79 lang_statement_list_type add;
80 asection *input_section;
83 /* Traverse the linker tree to find the spot where the stub goes. */
86 hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp)
88 lang_statement_union_type *l;
91 for (; (l = *lp) != NULL; lp = &l->header.next)
93 switch (l->header.type)
95 case lang_constructors_statement_enum:
96 ret = hook_in_stub (info, &constructor_list.head);
101 case lang_output_section_statement_enum:
102 ret = hook_in_stub (info,
103 &l->output_section_statement.children.head);
108 case lang_wild_statement_enum:
109 ret = hook_in_stub (info, &l->wild_statement.children.head);
114 case lang_group_statement_enum:
115 ret = hook_in_stub (info, &l->group_statement.children.head);
120 case lang_input_section_enum:
121 if (l->input_section.section == info->input_section)
123 /* We've found our section. Insert the stub immediately
124 after its associated input section. */
125 *(info->add.tail) = l->header.next;
126 l->header.next = info->add.head;
131 case lang_data_statement_enum:
132 case lang_reloc_statement_enum:
133 case lang_object_symbols_statement_enum:
134 case lang_output_statement_enum:
135 case lang_target_statement_enum:
136 case lang_input_statement_enum:
137 case lang_assignment_statement_enum:
138 case lang_padding_statement_enum:
139 case lang_address_statement_enum:
140 case lang_fill_statement_enum:
152 /* Call-back for elf${ELFSIZE}_aarch64_size_stubs. */
154 /* Create a new stub section, and arrange for it to be linked
155 immediately after INPUT_SECTION. */
158 elf${ELFSIZE}_aarch64_add_stub_section (const char *stub_sec_name,
159 asection *input_section)
163 asection *output_section;
164 lang_output_section_statement_type *os;
165 struct hook_stub_info info;
167 flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
168 | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
169 stub_sec = bfd_make_section_anyway_with_flags (stub_file->the_bfd,
170 stub_sec_name, flags);
171 if (stub_sec == NULL)
174 bfd_set_section_alignment (stub_file->the_bfd, stub_sec, 2);
176 output_section = input_section->output_section;
177 os = lang_output_section_get (output_section);
179 info.input_section = input_section;
180 lang_list_init (&info.add);
181 lang_add_section (&info.add, stub_sec, NULL, os);
183 if (info.add.head == NULL)
186 if (hook_in_stub (&info, &os->children.head))
190 einfo ("%X%P: can not make stub section: %E\n");
194 /* Another call-back for elf${ELFSIZE}_aarch64_size_stubs. */
197 gldaarch64_layout_sections_again (void)
199 /* If we have changed sizes of the stub sections, then we need
200 to recalculate all the section offsets. This may mean we need to
201 add even more stubs. */
202 gld${EMULATION_NAME}_map_segments (TRUE);
203 need_laying_out = -1;
207 build_section_lists (lang_statement_union_type *statement)
209 if (statement->header.type == lang_input_section_enum)
211 asection *i = statement->input_section.section;
213 if (!((lang_input_statement_type *) i->owner->usrdata)->flags.just_syms
214 && (i->flags & SEC_EXCLUDE) == 0
215 && i->output_section != NULL
216 && i->output_section->owner == link_info.output_bfd)
217 elf${ELFSIZE}_aarch64_next_input_section (& link_info, i);
222 gld${EMULATION_NAME}_after_allocation (void)
226 /* bfd_elf32_discard_info just plays with debugging sections,
227 ie. doesn't affect any code, so we can delay resizing the
228 sections. It's likely we'll resize everything in the process of
230 ret = bfd_elf_discard_info (link_info.output_bfd, & link_info);
233 einfo ("%X%P: .eh_frame/.stab edit: %E\n");
239 /* If generating a relocatable output file, then we don't
240 have to examine the relocs. */
241 if (stub_file != NULL && !bfd_link_relocatable (&link_info))
243 ret = elf${ELFSIZE}_aarch64_setup_section_lists (link_info.output_bfd,
249 einfo ("%X%P: could not compute sections lists for stub generation: %E\n");
253 lang_for_each_statement (build_section_lists);
255 /* Call into the BFD backend to do the real work. */
256 if (! elf${ELFSIZE}_aarch64_size_stubs (link_info.output_bfd,
260 & elf${ELFSIZE}_aarch64_add_stub_section,
261 & gldaarch64_layout_sections_again))
263 einfo ("%X%P: cannot size stub section: %E\n");
269 if (need_laying_out != -1)
270 gld${EMULATION_NAME}_map_segments (need_laying_out);
274 gld${EMULATION_NAME}_finish (void)
276 if (!bfd_link_relocatable (&link_info))
278 /* Now build the linker stubs. */
279 if (stub_file->the_bfd->sections != NULL)
281 if (! elf${ELFSIZE}_aarch64_build_stubs (& link_info))
282 einfo ("%X%P: can not build stubs: %E\n");
289 /* This is a convenient point to tell BFD about target specific flags.
290 After the output has been created, but before inputs are read. */
292 aarch64_elf_create_output_section_statements (void)
294 if (strstr (bfd_get_target (link_info.output_bfd), "aarch64") == NULL)
296 /* The arm backend needs special fields in the output hash structure.
297 These will only be created if the output format is an arm format,
298 hence we do not support linking and changing output formats at the
299 same time. Use a link followed by objcopy to change output formats. */
300 einfo ("%F%X%P: error: Cannot change output format whilst linking AArch64 binaries.\n");
304 bfd_elf${ELFSIZE}_aarch64_set_options (link_info.output_bfd, &link_info,
305 no_enum_size_warning,
306 no_wchar_size_warning,
308 fix_erratum_835769, fix_erratum_843419);
310 stub_file = lang_add_input_file ("linker stubs",
311 lang_input_file_is_fake_enum,
313 stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd);
314 if (stub_file->the_bfd == NULL
315 || ! bfd_set_arch_mach (stub_file->the_bfd,
316 bfd_get_arch (link_info.output_bfd),
317 bfd_get_mach (link_info.output_bfd)))
319 einfo ("%X%P: can not create BFD %E\n");
323 stub_file->the_bfd->flags |= BFD_LINKER_CREATED;
324 ldlang_add_file (stub_file);
327 /* Avoid processing the fake stub_file in vercheck, stat_needed and
328 check_needed routines. */
330 static void (*real_func) (lang_input_statement_type *);
332 static void aarch64_for_each_input_file_wrapper (lang_input_statement_type *l)
339 aarch64_lang_for_each_input_file (void (*func) (lang_input_statement_type *))
342 lang_for_each_input_file (&aarch64_for_each_input_file_wrapper);
345 #define lang_for_each_input_file aarch64_lang_for_each_input_file
349 # Define some shell vars to insert bits of code into the standard elf
350 # parse_args and list_options functions.
352 PARSE_AND_LIST_PROLOGUE='
353 #define OPTION_NO_ENUM_SIZE_WARNING 309
354 #define OPTION_PIC_VENEER 310
355 #define OPTION_STUBGROUP_SIZE 311
356 #define OPTION_NO_WCHAR_SIZE_WARNING 312
357 #define OPTION_FIX_ERRATUM_835769 313
358 #define OPTION_FIX_ERRATUM_843419 314
361 PARSE_AND_LIST_SHORTOPTS=p
363 PARSE_AND_LIST_LONGOPTS='
364 { "no-pipeline-knowledge", no_argument, NULL, '\'p\''},
365 { "no-enum-size-warning", no_argument, NULL, OPTION_NO_ENUM_SIZE_WARNING},
366 { "pic-veneer", no_argument, NULL, OPTION_PIC_VENEER},
367 { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
368 { "no-wchar-size-warning", no_argument, NULL, OPTION_NO_WCHAR_SIZE_WARNING},
369 { "fix-cortex-a53-835769", no_argument, NULL, OPTION_FIX_ERRATUM_835769},
370 { "fix-cortex-a53-843419", no_argument, NULL, OPTION_FIX_ERRATUM_843419},
373 PARSE_AND_LIST_OPTIONS='
374 fprintf (file, _(" --no-enum-size-warning Don'\''t warn about objects with incompatible\n"
376 fprintf (file, _(" --no-wchar-size-warning Don'\''t warn about objects with incompatible"
377 " wchar_t sizes\n"));
378 fprintf (file, _(" --pic-veneer Always generate PIC interworking veneers\n"));
380 --stub-group-size=N Maximum size of a group of input sections that can be\n\
381 handled by one stub section. A negative value\n\
382 locates all stubs after their branches (with a\n\
383 group size of -N), while a positive value allows\n\
384 two groups of input sections, one before, and one\n\
385 after each stub section. Values of +/-1 indicate\n\
386 the linker should choose suitable defaults.\n"
388 fprintf (file, _(" --fix-cortex-a53-835769 Fix erratum 835769\n"));
389 fprintf (file, _(" --fix-cortex-a53-843419 Fix erratum 843419\n"));
392 PARSE_AND_LIST_ARGS_CASES='
394 /* Only here for backwards compatibility. */
397 case OPTION_NO_ENUM_SIZE_WARNING:
398 no_enum_size_warning = 1;
401 case OPTION_NO_WCHAR_SIZE_WARNING:
402 no_wchar_size_warning = 1;
405 case OPTION_PIC_VENEER:
409 case OPTION_FIX_ERRATUM_835769:
410 fix_erratum_835769 = 1;
413 case OPTION_FIX_ERRATUM_843419:
414 fix_erratum_843419 = 1;
417 case OPTION_STUBGROUP_SIZE:
421 group_size = bfd_scan_vma (optarg, &end, 0);
423 einfo (_("%P%F: invalid number `%s'\''\n"), optarg);
428 # We have our own before_allocation etc. functions, but they call
429 # the standard routines, so give them a different name.
430 LDEMUL_BEFORE_ALLOCATION=aarch64_elf_before_allocation
431 LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
432 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=aarch64_elf_create_output_section_statements
434 # Replace the elf before_parse function with our own.
435 LDEMUL_BEFORE_PARSE=gld"${EMULATION_NAME}"_before_parse
437 # Call the extra arm-elf function
438 LDEMUL_FINISH=gld${EMULATION_NAME}_finish