1 # This shell script emits a C file. -*- C -*-
2 # Copyright 2009-2012 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${SEPARATE_CODE}" = xyes ; then echo TRUE ; else echo FALSE ; fi`;
46 aarch64_elf_before_allocation (void)
48 /* We should be able to set the size of the interworking stub section. We
49 can't do it until later if we have dynamic sections, though. */
50 if (! elf_hash_table (&link_info)->dynamic_sections_created)
52 /* Here we rummage through the found bfds to collect information. */
53 LANG_FOR_EACH_INPUT_STATEMENT (is)
55 /* Initialise mapping tables for code/data. */
56 bfd_elf64_aarch64_init_maps (is->the_bfd);
60 /* Call the standard elf routine. */
61 gld${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 elf64_aarch64_size_stubs. */
152 /* Create a new stub section, and arrange for it to be linked
153 immediately after INPUT_SECTION. */
156 elf64_aarch64_add_stub_section (const char *stub_sec_name,
157 asection *input_section)
161 asection *output_section;
163 lang_output_section_statement_type *os;
164 struct hook_stub_info info;
166 flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
167 | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
168 stub_sec = bfd_make_section_anyway_with_flags (stub_file->the_bfd,
169 stub_sec_name, flags);
170 if (stub_sec == NULL)
173 bfd_set_section_alignment (stub_file->the_bfd, stub_sec, 3);
175 output_section = input_section->output_section;
176 secname = bfd_get_section_name (output_section->owner, output_section);
177 os = lang_output_section_find (secname);
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_arm_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${EMULATION_NAME}_map_segments (TRUE);
203 need_laying_out = -1;
207 build_section_lists (lang_statement_union_type *statement)
209 if (statement->header.type == lang_input_section_enum)
211 asection *i = statement->input_section.section;
213 if (!((lang_input_statement_type *) i->owner->usrdata)->flags.just_syms
214 && (i->flags & SEC_EXCLUDE) == 0
215 && i->output_section != NULL
216 && i->output_section->owner == link_info.output_bfd)
217 elf64_aarch64_next_input_section (& link_info, i);
222 gld${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 if (bfd_elf_discard_info (link_info.output_bfd, & link_info))
231 /* If generating a relocatable output file, then we don't
232 have to examine the relocs. */
233 if (stub_file != NULL && !link_info.relocatable)
235 int ret = elf64_aarch64_setup_section_lists (link_info.output_bfd,
242 einfo ("%X%P: could not compute sections lists for stub generation: %E\n");
246 lang_for_each_statement (build_section_lists);
248 /* Call into the BFD backend to do the real work. */
249 if (! elf64_aarch64_size_stubs (link_info.output_bfd,
253 & elf64_aarch64_add_stub_section,
254 & gldaarch64_layout_sections_again))
256 einfo ("%X%P: cannot size stub section: %E\n");
262 if (need_laying_out != -1)
263 gld${EMULATION_NAME}_map_segments (need_laying_out);
267 gld${EMULATION_NAME}_finish (void)
269 if (! link_info.relocatable)
271 /* Now build the linker stubs. */
272 if (stub_file->the_bfd->sections != NULL)
274 if (! elf64_aarch64_build_stubs (& link_info))
275 einfo ("%X%P: can not build stubs: %E\n");
282 /* This is a convenient point to tell BFD about target specific flags.
283 After the output has been created, but before inputs are read. */
285 aarch64_elf_create_output_section_statements (void)
287 if (strstr (bfd_get_target (link_info.output_bfd), "aarch64") == NULL)
289 /* The arm backend needs special fields in the output hash structure.
290 These will only be created if the output format is an arm format,
291 hence we do not support linking and changing output formats at the
292 same time. Use a link followed by objcopy to change output formats. */
293 einfo ("%F%X%P: error: Cannot change output format whilst linking AArch64 binaries.\n");
297 bfd_elf64_aarch64_set_options (link_info.output_bfd, &link_info,
298 no_enum_size_warning,
299 no_wchar_size_warning,
302 stub_file = lang_add_input_file ("linker stubs",
303 lang_input_file_is_fake_enum,
305 stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd);
306 if (stub_file->the_bfd == NULL
307 || ! bfd_set_arch_mach (stub_file->the_bfd,
308 bfd_get_arch (link_info.output_bfd),
309 bfd_get_mach (link_info.output_bfd)))
311 einfo ("%X%P: can not create BFD %E\n");
315 stub_file->the_bfd->flags |= BFD_LINKER_CREATED;
316 ldlang_add_file (stub_file);
319 /* Avoid processing the fake stub_file in vercheck, stat_needed and
320 check_needed routines. */
322 static void (*real_func) (lang_input_statement_type *);
324 static void aarch64_for_each_input_file_wrapper (lang_input_statement_type *l)
331 aarch64_lang_for_each_input_file (void (*func) (lang_input_statement_type *))
334 lang_for_each_input_file (&aarch64_for_each_input_file_wrapper);
337 #define lang_for_each_input_file aarch64_lang_for_each_input_file
341 # Define some shell vars to insert bits of code into the standard elf
342 # parse_args and list_options functions.
344 PARSE_AND_LIST_PROLOGUE='
345 #define OPTION_NO_ENUM_SIZE_WARNING 309
346 #define OPTION_PIC_VENEER 310
347 #define OPTION_STUBGROUP_SIZE 311
348 #define OPTION_NO_WCHAR_SIZE_WARNING 312
351 PARSE_AND_LIST_SHORTOPTS=p
353 PARSE_AND_LIST_LONGOPTS='
354 { "no-pipeline-knowledge", no_argument, NULL, '\'p\''},
355 { "no-enum-size-warning", no_argument, NULL, OPTION_NO_ENUM_SIZE_WARNING},
356 { "pic-veneer", no_argument, NULL, OPTION_PIC_VENEER},
357 { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
358 { "no-wchar-size-warning", no_argument, NULL, OPTION_NO_WCHAR_SIZE_WARNING},
361 PARSE_AND_LIST_OPTIONS='
362 fprintf (file, _(" --no-enum-size-warning Don'\''t warn about objects with incompatible\n"
364 fprintf (file, _(" --no-wchar-size-warning Don'\''t warn about objects with incompatible"
365 " wchar_t sizes\n"));
366 fprintf (file, _(" --pic-veneer Always generate PIC interworking veneers\n"));
368 --stub-group-size=N Maximum size of a group of input sections that can be\n\
369 handled by one stub section. A negative value\n\
370 locates all stubs after their branches (with a\n\
371 group size of -N), while a positive value allows\n\
372 two groups of input sections, one before, and one\n\
373 after each stub section. Values of +/-1 indicate\n\
374 the linker should choose suitable defaults.\n"
378 PARSE_AND_LIST_ARGS_CASES='
380 /* Only here for backwards compatibility. */
383 case OPTION_NO_ENUM_SIZE_WARNING:
384 no_enum_size_warning = 1;
387 case OPTION_NO_WCHAR_SIZE_WARNING:
388 no_wchar_size_warning = 1;
391 case OPTION_PIC_VENEER:
395 case OPTION_STUBGROUP_SIZE:
399 group_size = bfd_scan_vma (optarg, &end, 0);
401 einfo (_("%P%F: invalid number `%s'\''\n"), optarg);
406 # We have our own before_allocation etc. functions, but they call
407 # the standard routines, so give them a different name.
408 LDEMUL_BEFORE_ALLOCATION=aarch64_elf_before_allocation
409 LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
410 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=aarch64_elf_create_output_section_statements
412 # Replace the elf before_parse function with our own.
413 LDEMUL_BEFORE_PARSE=gld"${EMULATION_NAME}"_before_parse
415 # Call the extra arm-elf function
416 LDEMUL_FINISH=gld${EMULATION_NAME}_finish