1 # This shell script emits a C file. -*- C -*-
2 # Copyright (C) 2009-2014 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;
35 gld${EMULATION_NAME}_before_parse (void)
37 #ifndef TARGET_ /* I.e., if not generic. */
38 ldfile_set_output_arch ("`echo ${ARCH}`", bfd_arch_unknown);
39 #endif /* not TARGET_ */
40 input_flags.dynamic = ${DYNAMIC_LINK-TRUE};
41 config.has_shared = `if test -n "$GENERATE_SHLIB_SCRIPT" ; then echo TRUE ; else echo FALSE ; fi`;
42 config.separate_code = `if test "x${SEPARATE_CODE}" = xyes ; then echo TRUE ; else echo FALSE ; fi`;
46 aarch64_elf_before_allocation (void)
48 /* We should be able to set the size of the interworking stub section. We
49 can't do it until later if we have dynamic sections, though. */
50 if (! elf_hash_table (&link_info)->dynamic_sections_created)
52 /* Here we rummage through the found bfds to collect information. */
53 LANG_FOR_EACH_INPUT_STATEMENT (is)
55 /* Initialise mapping tables for code/data. */
56 bfd_elf${ELFSIZE}_aarch64_init_maps (is->the_bfd);
60 /* Call the standard elf routine. */
61 gld${EMULATION_NAME}_before_allocation ();
64 /* Fake input file for stubs. */
65 static lang_input_statement_type *stub_file;
67 /* Whether we need to call gldarm_layout_sections_again. */
68 static int need_laying_out = 0;
70 /* Maximum size of a group of input sections that can be handled by
71 one stub section. A value of +/-1 indicates the bfd back-end
72 should use a suitable default size. */
73 static bfd_signed_vma group_size = 1;
77 lang_statement_list_type add;
78 asection *input_section;
81 /* Traverse the linker tree to find the spot where the stub goes. */
84 hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp)
86 lang_statement_union_type *l;
89 for (; (l = *lp) != NULL; lp = &l->header.next)
91 switch (l->header.type)
93 case lang_constructors_statement_enum:
94 ret = hook_in_stub (info, &constructor_list.head);
99 case lang_output_section_statement_enum:
100 ret = hook_in_stub (info,
101 &l->output_section_statement.children.head);
106 case lang_wild_statement_enum:
107 ret = hook_in_stub (info, &l->wild_statement.children.head);
112 case lang_group_statement_enum:
113 ret = hook_in_stub (info, &l->group_statement.children.head);
118 case lang_input_section_enum:
119 if (l->input_section.section == info->input_section)
121 /* We've found our section. Insert the stub immediately
122 after its associated input section. */
123 *(info->add.tail) = l->header.next;
124 l->header.next = info->add.head;
129 case lang_data_statement_enum:
130 case lang_reloc_statement_enum:
131 case lang_object_symbols_statement_enum:
132 case lang_output_statement_enum:
133 case lang_target_statement_enum:
134 case lang_input_statement_enum:
135 case lang_assignment_statement_enum:
136 case lang_padding_statement_enum:
137 case lang_address_statement_enum:
138 case lang_fill_statement_enum:
150 /* Call-back for elf${ELFSIZE}_aarch64_size_stubs. */
152 /* Create a new stub section, and arrange for it to be linked
153 immediately after INPUT_SECTION. */
156 elf${ELFSIZE}_aarch64_add_stub_section (const char *stub_sec_name,
157 asection *input_section)
161 asection *output_section;
162 lang_output_section_statement_type *os;
163 struct hook_stub_info info;
165 flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
166 | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
167 stub_sec = bfd_make_section_anyway_with_flags (stub_file->the_bfd,
168 stub_sec_name, flags);
169 if (stub_sec == NULL)
172 bfd_set_section_alignment (stub_file->the_bfd, stub_sec, 3);
174 output_section = input_section->output_section;
175 os = lang_output_section_get (output_section);
177 info.input_section = input_section;
178 lang_list_init (&info.add);
179 lang_add_section (&info.add, stub_sec, NULL, os);
181 if (info.add.head == NULL)
184 if (hook_in_stub (&info, &os->children.head))
188 einfo ("%X%P: can not make stub section: %E\n");
192 /* Another call-back for elf${ELFSIZE}_aarch64_size_stubs. */
195 gldaarch64_layout_sections_again (void)
197 /* If we have changed sizes of the stub sections, then we need
198 to recalculate all the section offsets. This may mean we need to
199 add even more stubs. */
200 gld${EMULATION_NAME}_map_segments (TRUE);
201 need_laying_out = -1;
205 build_section_lists (lang_statement_union_type *statement)
207 if (statement->header.type == lang_input_section_enum)
209 asection *i = statement->input_section.section;
211 if (!((lang_input_statement_type *) i->owner->usrdata)->flags.just_syms
212 && (i->flags & SEC_EXCLUDE) == 0
213 && i->output_section != NULL
214 && i->output_section->owner == link_info.output_bfd)
215 elf${ELFSIZE}_aarch64_next_input_section (& link_info, i);
220 gld${EMULATION_NAME}_after_allocation (void)
224 /* bfd_elf32_discard_info just plays with debugging sections,
225 ie. doesn't affect any code, so we can delay resizing the
226 sections. It's likely we'll resize everything in the process of
228 ret = bfd_elf_discard_info (link_info.output_bfd, & link_info);
231 einfo ("%X%P: .eh_frame/.stab edit: %E\n");
237 /* If generating a relocatable output file, then we don't
238 have to examine the relocs. */
239 if (stub_file != NULL && !link_info.relocatable)
241 ret = elf${ELFSIZE}_aarch64_setup_section_lists (link_info.output_bfd,
247 einfo ("%X%P: could not compute sections lists for stub generation: %E\n");
251 lang_for_each_statement (build_section_lists);
253 /* Call into the BFD backend to do the real work. */
254 if (! elf${ELFSIZE}_aarch64_size_stubs (link_info.output_bfd,
258 & elf${ELFSIZE}_aarch64_add_stub_section,
259 & gldaarch64_layout_sections_again))
261 einfo ("%X%P: cannot size stub section: %E\n");
267 if (need_laying_out != -1)
268 gld${EMULATION_NAME}_map_segments (need_laying_out);
272 gld${EMULATION_NAME}_finish (void)
274 if (! link_info.relocatable)
276 /* Now build the linker stubs. */
277 if (stub_file->the_bfd->sections != NULL)
279 if (! elf${ELFSIZE}_aarch64_build_stubs (& link_info))
280 einfo ("%X%P: can not build stubs: %E\n");
287 /* This is a convenient point to tell BFD about target specific flags.
288 After the output has been created, but before inputs are read. */
290 aarch64_elf_create_output_section_statements (void)
292 if (strstr (bfd_get_target (link_info.output_bfd), "aarch64") == NULL)
294 /* The arm backend needs special fields in the output hash structure.
295 These will only be created if the output format is an arm format,
296 hence we do not support linking and changing output formats at the
297 same time. Use a link followed by objcopy to change output formats. */
298 einfo ("%F%X%P: error: Cannot change output format whilst linking AArch64 binaries.\n");
302 bfd_elf${ELFSIZE}_aarch64_set_options (link_info.output_bfd, &link_info,
303 no_enum_size_warning,
304 no_wchar_size_warning,
307 stub_file = lang_add_input_file ("linker stubs",
308 lang_input_file_is_fake_enum,
310 stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd);
311 if (stub_file->the_bfd == NULL
312 || ! bfd_set_arch_mach (stub_file->the_bfd,
313 bfd_get_arch (link_info.output_bfd),
314 bfd_get_mach (link_info.output_bfd)))
316 einfo ("%X%P: can not create BFD %E\n");
320 stub_file->the_bfd->flags |= BFD_LINKER_CREATED;
321 ldlang_add_file (stub_file);
324 /* Avoid processing the fake stub_file in vercheck, stat_needed and
325 check_needed routines. */
327 static void (*real_func) (lang_input_statement_type *);
329 static void aarch64_for_each_input_file_wrapper (lang_input_statement_type *l)
336 aarch64_lang_for_each_input_file (void (*func) (lang_input_statement_type *))
339 lang_for_each_input_file (&aarch64_for_each_input_file_wrapper);
342 #define lang_for_each_input_file aarch64_lang_for_each_input_file
346 # Define some shell vars to insert bits of code into the standard elf
347 # parse_args and list_options functions.
349 PARSE_AND_LIST_PROLOGUE='
350 #define OPTION_NO_ENUM_SIZE_WARNING 309
351 #define OPTION_PIC_VENEER 310
352 #define OPTION_STUBGROUP_SIZE 311
353 #define OPTION_NO_WCHAR_SIZE_WARNING 312
356 PARSE_AND_LIST_SHORTOPTS=p
358 PARSE_AND_LIST_LONGOPTS='
359 { "no-pipeline-knowledge", no_argument, NULL, '\'p\''},
360 { "no-enum-size-warning", no_argument, NULL, OPTION_NO_ENUM_SIZE_WARNING},
361 { "pic-veneer", no_argument, NULL, OPTION_PIC_VENEER},
362 { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
363 { "no-wchar-size-warning", no_argument, NULL, OPTION_NO_WCHAR_SIZE_WARNING},
366 PARSE_AND_LIST_OPTIONS='
367 fprintf (file, _(" --no-enum-size-warning Don'\''t warn about objects with incompatible\n"
369 fprintf (file, _(" --no-wchar-size-warning Don'\''t warn about objects with incompatible"
370 " wchar_t sizes\n"));
371 fprintf (file, _(" --pic-veneer Always generate PIC interworking veneers\n"));
373 --stub-group-size=N Maximum size of a group of input sections that can be\n\
374 handled by one stub section. A negative value\n\
375 locates all stubs after their branches (with a\n\
376 group size of -N), while a positive value allows\n\
377 two groups of input sections, one before, and one\n\
378 after each stub section. Values of +/-1 indicate\n\
379 the linker should choose suitable defaults.\n"
383 PARSE_AND_LIST_ARGS_CASES='
385 /* Only here for backwards compatibility. */
388 case OPTION_NO_ENUM_SIZE_WARNING:
389 no_enum_size_warning = 1;
392 case OPTION_NO_WCHAR_SIZE_WARNING:
393 no_wchar_size_warning = 1;
396 case OPTION_PIC_VENEER:
400 case OPTION_STUBGROUP_SIZE:
404 group_size = bfd_scan_vma (optarg, &end, 0);
406 einfo (_("%P%F: invalid number `%s'\''\n"), optarg);
411 # We have our own before_allocation etc. functions, but they call
412 # the standard routines, so give them a different name.
413 LDEMUL_BEFORE_ALLOCATION=aarch64_elf_before_allocation
414 LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
415 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=aarch64_elf_create_output_section_statements
417 # Replace the elf before_parse function with our own.
418 LDEMUL_BEFORE_PARSE=gld"${EMULATION_NAME}"_before_parse
420 # Call the extra arm-elf function
421 LDEMUL_FINISH=gld${EMULATION_NAME}_finish