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${EMULATION_NAME}_after_allocation (void)
222 /* bfd_elf32_discard_info just plays with debugging sections,
223 ie. doesn't affect any code, so we can delay resizing the
224 sections. It's likely we'll resize everything in the process of
226 if (bfd_elf_discard_info (link_info.output_bfd, & link_info))
229 /* If generating a relocatable output file, then we don't
230 have to examine the relocs. */
231 if (stub_file != NULL && !link_info.relocatable)
233 int ret = elf${ELFSIZE}_aarch64_setup_section_lists (link_info.output_bfd,
240 einfo ("%X%P: could not compute sections lists for stub generation: %E\n");
244 lang_for_each_statement (build_section_lists);
246 /* Call into the BFD backend to do the real work. */
247 if (! elf${ELFSIZE}_aarch64_size_stubs (link_info.output_bfd,
251 & elf${ELFSIZE}_aarch64_add_stub_section,
252 & gldaarch64_layout_sections_again))
254 einfo ("%X%P: cannot size stub section: %E\n");
260 if (need_laying_out != -1)
261 gld${EMULATION_NAME}_map_segments (need_laying_out);
265 gld${EMULATION_NAME}_finish (void)
267 if (! link_info.relocatable)
269 /* Now build the linker stubs. */
270 if (stub_file->the_bfd->sections != NULL)
272 if (! elf${ELFSIZE}_aarch64_build_stubs (& link_info))
273 einfo ("%X%P: can not build stubs: %E\n");
280 /* This is a convenient point to tell BFD about target specific flags.
281 After the output has been created, but before inputs are read. */
283 aarch64_elf_create_output_section_statements (void)
285 if (strstr (bfd_get_target (link_info.output_bfd), "aarch64") == NULL)
287 /* The arm backend needs special fields in the output hash structure.
288 These will only be created if the output format is an arm format,
289 hence we do not support linking and changing output formats at the
290 same time. Use a link followed by objcopy to change output formats. */
291 einfo ("%F%X%P: error: Cannot change output format whilst linking AArch64 binaries.\n");
295 bfd_elf${ELFSIZE}_aarch64_set_options (link_info.output_bfd, &link_info,
296 no_enum_size_warning,
297 no_wchar_size_warning,
300 stub_file = lang_add_input_file ("linker stubs",
301 lang_input_file_is_fake_enum,
303 stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd);
304 if (stub_file->the_bfd == NULL
305 || ! bfd_set_arch_mach (stub_file->the_bfd,
306 bfd_get_arch (link_info.output_bfd),
307 bfd_get_mach (link_info.output_bfd)))
309 einfo ("%X%P: can not create BFD %E\n");
313 stub_file->the_bfd->flags |= BFD_LINKER_CREATED;
314 ldlang_add_file (stub_file);
317 /* Avoid processing the fake stub_file in vercheck, stat_needed and
318 check_needed routines. */
320 static void (*real_func) (lang_input_statement_type *);
322 static void aarch64_for_each_input_file_wrapper (lang_input_statement_type *l)
329 aarch64_lang_for_each_input_file (void (*func) (lang_input_statement_type *))
332 lang_for_each_input_file (&aarch64_for_each_input_file_wrapper);
335 #define lang_for_each_input_file aarch64_lang_for_each_input_file
339 # Define some shell vars to insert bits of code into the standard elf
340 # parse_args and list_options functions.
342 PARSE_AND_LIST_PROLOGUE='
343 #define OPTION_NO_ENUM_SIZE_WARNING 309
344 #define OPTION_PIC_VENEER 310
345 #define OPTION_STUBGROUP_SIZE 311
346 #define OPTION_NO_WCHAR_SIZE_WARNING 312
349 PARSE_AND_LIST_SHORTOPTS=p
351 PARSE_AND_LIST_LONGOPTS='
352 { "no-pipeline-knowledge", no_argument, NULL, '\'p\''},
353 { "no-enum-size-warning", no_argument, NULL, OPTION_NO_ENUM_SIZE_WARNING},
354 { "pic-veneer", no_argument, NULL, OPTION_PIC_VENEER},
355 { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
356 { "no-wchar-size-warning", no_argument, NULL, OPTION_NO_WCHAR_SIZE_WARNING},
359 PARSE_AND_LIST_OPTIONS='
360 fprintf (file, _(" --no-enum-size-warning Don'\''t warn about objects with incompatible\n"
362 fprintf (file, _(" --no-wchar-size-warning Don'\''t warn about objects with incompatible"
363 " wchar_t sizes\n"));
364 fprintf (file, _(" --pic-veneer Always generate PIC interworking veneers\n"));
366 --stub-group-size=N Maximum size of a group of input sections that can be\n\
367 handled by one stub section. A negative value\n\
368 locates all stubs after their branches (with a\n\
369 group size of -N), while a positive value allows\n\
370 two groups of input sections, one before, and one\n\
371 after each stub section. Values of +/-1 indicate\n\
372 the linker should choose suitable defaults.\n"
376 PARSE_AND_LIST_ARGS_CASES='
378 /* Only here for backwards compatibility. */
381 case OPTION_NO_ENUM_SIZE_WARNING:
382 no_enum_size_warning = 1;
385 case OPTION_NO_WCHAR_SIZE_WARNING:
386 no_wchar_size_warning = 1;
389 case OPTION_PIC_VENEER:
393 case OPTION_STUBGROUP_SIZE:
397 group_size = bfd_scan_vma (optarg, &end, 0);
399 einfo (_("%P%F: invalid number `%s'\''\n"), optarg);
404 # We have our own before_allocation etc. functions, but they call
405 # the standard routines, so give them a different name.
406 LDEMUL_BEFORE_ALLOCATION=aarch64_elf_before_allocation
407 LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
408 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=aarch64_elf_create_output_section_statements
410 # Replace the elf before_parse function with our own.
411 LDEMUL_BEFORE_PARSE=gld"${EMULATION_NAME}"_before_parse
413 # Call the extra arm-elf function
414 LDEMUL_FINISH=gld${EMULATION_NAME}_finish