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a06ea964 | 1 | # This shell script emits a C file. -*- C -*- |
219d1afa | 2 | # Copyright (C) 2009-2018 Free Software Foundation, Inc. |
a06ea964 NC |
3 | # Contributed by ARM Ltd. |
4 | # | |
5 | # This file is part of the GNU Binutils. | |
6 | # | |
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. | |
11 | # | |
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. | |
16 | # | |
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/>. | |
20 | # | |
21 | ||
22 | # This file is sourced from elf32.em, and defines extra aarch64-elf | |
23 | # specific routines. | |
24 | # | |
25 | fragment <<EOF | |
26 | ||
27 | #include "ldctor.h" | |
28 | #include "elf/aarch64.h" | |
29 | ||
30 | static int no_enum_size_warning = 0; | |
31 | static int no_wchar_size_warning = 0; | |
32 | static int pic_veneer = 0; | |
68fcca92 | 33 | static int fix_erratum_835769 = 0; |
4106101c | 34 | static int fix_erratum_843419 = 0; |
1f56df9d | 35 | static int no_apply_dynamic_relocs = 0; |
a06ea964 NC |
36 | |
37 | static void | |
38 | gld${EMULATION_NAME}_before_parse (void) | |
39 | { | |
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`; | |
e2caaa1f | 45 | config.separate_code = `if test "x${SEPARATE_CODE}" = xyes ; then echo TRUE ; else echo FALSE ; fi`; |
5c3261b0 | 46 | link_info.check_relocs_after_open_input = TRUE; |
576438f0 | 47 | link_info.relro = DEFAULT_LD_Z_RELRO; |
a06ea964 NC |
48 | } |
49 | ||
50 | static void | |
51 | aarch64_elf_before_allocation (void) | |
52 | { | |
53 | /* We should be able to set the size of the interworking stub section. We | |
54 | can't do it until later if we have dynamic sections, though. */ | |
55 | if (! elf_hash_table (&link_info)->dynamic_sections_created) | |
56 | { | |
57 | /* Here we rummage through the found bfds to collect information. */ | |
58 | LANG_FOR_EACH_INPUT_STATEMENT (is) | |
6c19b93b AM |
59 | { |
60 | /* Initialise mapping tables for code/data. */ | |
61 | bfd_elf${ELFSIZE}_aarch64_init_maps (is->the_bfd); | |
62 | } | |
a06ea964 NC |
63 | } |
64 | ||
65 | /* Call the standard elf routine. */ | |
66 | gld${EMULATION_NAME}_before_allocation (); | |
67 | } | |
68 | ||
69 | /* Fake input file for stubs. */ | |
70 | static lang_input_statement_type *stub_file; | |
71 | ||
72 | /* Whether we need to call gldarm_layout_sections_again. */ | |
73 | static int need_laying_out = 0; | |
74 | ||
75 | /* Maximum size of a group of input sections that can be handled by | |
76 | one stub section. A value of +/-1 indicates the bfd back-end | |
77 | should use a suitable default size. */ | |
78 | static bfd_signed_vma group_size = 1; | |
79 | ||
80 | struct hook_stub_info | |
81 | { | |
82 | lang_statement_list_type add; | |
83 | asection *input_section; | |
84 | }; | |
85 | ||
86 | /* Traverse the linker tree to find the spot where the stub goes. */ | |
87 | ||
88 | static bfd_boolean | |
89 | hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp) | |
90 | { | |
91 | lang_statement_union_type *l; | |
92 | bfd_boolean ret; | |
93 | ||
94 | for (; (l = *lp) != NULL; lp = &l->header.next) | |
95 | { | |
96 | switch (l->header.type) | |
97 | { | |
98 | case lang_constructors_statement_enum: | |
99 | ret = hook_in_stub (info, &constructor_list.head); | |
100 | if (ret) | |
101 | return ret; | |
102 | break; | |
103 | ||
104 | case lang_output_section_statement_enum: | |
105 | ret = hook_in_stub (info, | |
106 | &l->output_section_statement.children.head); | |
107 | if (ret) | |
108 | return ret; | |
109 | break; | |
110 | ||
111 | case lang_wild_statement_enum: | |
112 | ret = hook_in_stub (info, &l->wild_statement.children.head); | |
113 | if (ret) | |
114 | return ret; | |
115 | break; | |
116 | ||
117 | case lang_group_statement_enum: | |
118 | ret = hook_in_stub (info, &l->group_statement.children.head); | |
119 | if (ret) | |
120 | return ret; | |
121 | break; | |
122 | ||
123 | case lang_input_section_enum: | |
124 | if (l->input_section.section == info->input_section) | |
125 | { | |
126 | /* We've found our section. Insert the stub immediately | |
127 | after its associated input section. */ | |
128 | *(info->add.tail) = l->header.next; | |
129 | l->header.next = info->add.head; | |
130 | return TRUE; | |
131 | } | |
132 | break; | |
133 | ||
134 | case lang_data_statement_enum: | |
135 | case lang_reloc_statement_enum: | |
136 | case lang_object_symbols_statement_enum: | |
137 | case lang_output_statement_enum: | |
138 | case lang_target_statement_enum: | |
139 | case lang_input_statement_enum: | |
140 | case lang_assignment_statement_enum: | |
141 | case lang_padding_statement_enum: | |
142 | case lang_address_statement_enum: | |
143 | case lang_fill_statement_enum: | |
144 | break; | |
145 | ||
146 | default: | |
147 | FAIL (); | |
148 | break; | |
149 | } | |
150 | } | |
151 | return FALSE; | |
152 | } | |
153 | ||
154 | ||
4390599b | 155 | /* Call-back for elf${ELFSIZE}_aarch64_size_stubs. */ |
a06ea964 NC |
156 | |
157 | /* Create a new stub section, and arrange for it to be linked | |
158 | immediately after INPUT_SECTION. */ | |
159 | ||
160 | static asection * | |
4390599b | 161 | elf${ELFSIZE}_aarch64_add_stub_section (const char *stub_sec_name, |
499c37b5 | 162 | asection *input_section) |
a06ea964 NC |
163 | { |
164 | asection *stub_sec; | |
165 | flagword flags; | |
166 | asection *output_section; | |
a06ea964 NC |
167 | lang_output_section_statement_type *os; |
168 | struct hook_stub_info info; | |
169 | ||
170 | flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE | |
171 | | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP); | |
172 | stub_sec = bfd_make_section_anyway_with_flags (stub_file->the_bfd, | |
173 | stub_sec_name, flags); | |
174 | if (stub_sec == NULL) | |
175 | goto err_ret; | |
176 | ||
d9ced15d | 177 | bfd_set_section_alignment (stub_file->the_bfd, stub_sec, 2); |
a06ea964 NC |
178 | |
179 | output_section = input_section->output_section; | |
24ef1aa7 | 180 | os = lang_output_section_get (output_section); |
a06ea964 NC |
181 | |
182 | info.input_section = input_section; | |
183 | lang_list_init (&info.add); | |
184 | lang_add_section (&info.add, stub_sec, NULL, os); | |
185 | ||
186 | if (info.add.head == NULL) | |
187 | goto err_ret; | |
188 | ||
189 | if (hook_in_stub (&info, &os->children.head)) | |
190 | return stub_sec; | |
191 | ||
192 | err_ret: | |
d003af55 | 193 | einfo (_("%X%P: can not make stub section: %E\n")); |
a06ea964 NC |
194 | return NULL; |
195 | } | |
196 | ||
4390599b | 197 | /* Another call-back for elf${ELFSIZE}_aarch64_size_stubs. */ |
a06ea964 NC |
198 | |
199 | static void | |
200 | gldaarch64_layout_sections_again (void) | |
201 | { | |
202 | /* If we have changed sizes of the stub sections, then we need | |
203 | to recalculate all the section offsets. This may mean we need to | |
204 | add even more stubs. */ | |
205 | gld${EMULATION_NAME}_map_segments (TRUE); | |
206 | need_laying_out = -1; | |
207 | } | |
208 | ||
209 | static void | |
210 | build_section_lists (lang_statement_union_type *statement) | |
211 | { | |
212 | if (statement->header.type == lang_input_section_enum) | |
213 | { | |
214 | asection *i = statement->input_section.section; | |
215 | ||
216 | if (!((lang_input_statement_type *) i->owner->usrdata)->flags.just_syms | |
217 | && (i->flags & SEC_EXCLUDE) == 0 | |
218 | && i->output_section != NULL | |
219 | && i->output_section->owner == link_info.output_bfd) | |
4390599b | 220 | elf${ELFSIZE}_aarch64_next_input_section (& link_info, i); |
a06ea964 NC |
221 | } |
222 | } | |
223 | ||
224 | static void | |
225 | gld${EMULATION_NAME}_after_allocation (void) | |
226 | { | |
75938853 AM |
227 | int ret; |
228 | ||
a06ea964 NC |
229 | /* bfd_elf32_discard_info just plays with debugging sections, |
230 | ie. doesn't affect any code, so we can delay resizing the | |
231 | sections. It's likely we'll resize everything in the process of | |
232 | adding stubs. */ | |
75938853 AM |
233 | ret = bfd_elf_discard_info (link_info.output_bfd, & link_info); |
234 | if (ret < 0) | |
235 | { | |
d003af55 | 236 | einfo (_("%X%P: .eh_frame/.stab edit: %E\n")); |
75938853 AM |
237 | return; |
238 | } | |
239 | else if (ret > 0) | |
a06ea964 NC |
240 | need_laying_out = 1; |
241 | ||
242 | /* If generating a relocatable output file, then we don't | |
243 | have to examine the relocs. */ | |
0e1862bb | 244 | if (stub_file != NULL && !bfd_link_relocatable (&link_info)) |
a06ea964 | 245 | { |
75938853 AM |
246 | ret = elf${ELFSIZE}_aarch64_setup_section_lists (link_info.output_bfd, |
247 | &link_info); | |
a06ea964 NC |
248 | if (ret != 0) |
249 | { | |
250 | if (ret < 0) | |
251 | { | |
d003af55 AM |
252 | einfo (_("%X%P: could not compute sections lists " |
253 | "for stub generation: %E\n")); | |
a06ea964 NC |
254 | return; |
255 | } | |
256 | ||
257 | lang_for_each_statement (build_section_lists); | |
258 | ||
259 | /* Call into the BFD backend to do the real work. */ | |
4390599b | 260 | if (! elf${ELFSIZE}_aarch64_size_stubs (link_info.output_bfd, |
a06ea964 NC |
261 | stub_file->the_bfd, |
262 | & link_info, | |
263 | group_size, | |
4390599b | 264 | & elf${ELFSIZE}_aarch64_add_stub_section, |
a06ea964 NC |
265 | & gldaarch64_layout_sections_again)) |
266 | { | |
df5f2391 | 267 | einfo (_("%X%P: can not size stub section: %E\n")); |
a06ea964 NC |
268 | return; |
269 | } | |
270 | } | |
271 | } | |
272 | ||
273 | if (need_laying_out != -1) | |
274 | gld${EMULATION_NAME}_map_segments (need_laying_out); | |
275 | } | |
276 | ||
277 | static void | |
278 | gld${EMULATION_NAME}_finish (void) | |
279 | { | |
0e1862bb | 280 | if (!bfd_link_relocatable (&link_info)) |
a06ea964 NC |
281 | { |
282 | /* Now build the linker stubs. */ | |
283 | if (stub_file->the_bfd->sections != NULL) | |
284 | { | |
4390599b | 285 | if (! elf${ELFSIZE}_aarch64_build_stubs (& link_info)) |
d003af55 | 286 | einfo (_("%X%P: can not build stubs: %E\n")); |
a06ea964 NC |
287 | } |
288 | } | |
289 | ||
290 | finish_default (); | |
291 | } | |
292 | ||
293 | /* This is a convenient point to tell BFD about target specific flags. | |
294 | After the output has been created, but before inputs are read. */ | |
295 | static void | |
296 | aarch64_elf_create_output_section_statements (void) | |
297 | { | |
298 | if (strstr (bfd_get_target (link_info.output_bfd), "aarch64") == NULL) | |
299 | { | |
300 | /* The arm backend needs special fields in the output hash structure. | |
301 | These will only be created if the output format is an arm format, | |
302 | hence we do not support linking and changing output formats at the | |
303 | same time. Use a link followed by objcopy to change output formats. */ | |
df5f2391 AM |
304 | einfo (_("%F%P: error: cannot change output format " |
305 | "whilst linking %s binaries\n"), "AArch64"); | |
a06ea964 NC |
306 | return; |
307 | } | |
308 | ||
4390599b | 309 | bfd_elf${ELFSIZE}_aarch64_set_options (link_info.output_bfd, &link_info, |
a06ea964 NC |
310 | no_enum_size_warning, |
311 | no_wchar_size_warning, | |
4106101c | 312 | pic_veneer, |
1f56df9d JW |
313 | fix_erratum_835769, fix_erratum_843419, |
314 | no_apply_dynamic_relocs); | |
a06ea964 NC |
315 | |
316 | stub_file = lang_add_input_file ("linker stubs", | |
317 | lang_input_file_is_fake_enum, | |
318 | NULL); | |
319 | stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd); | |
320 | if (stub_file->the_bfd == NULL | |
321 | || ! bfd_set_arch_mach (stub_file->the_bfd, | |
322 | bfd_get_arch (link_info.output_bfd), | |
323 | bfd_get_mach (link_info.output_bfd))) | |
324 | { | |
df5f2391 | 325 | einfo (_("%F%P: can not create BFD: %E\n")); |
a06ea964 NC |
326 | return; |
327 | } | |
328 | ||
329 | stub_file->the_bfd->flags |= BFD_LINKER_CREATED; | |
330 | ldlang_add_file (stub_file); | |
331 | } | |
332 | ||
333 | /* Avoid processing the fake stub_file in vercheck, stat_needed and | |
334 | check_needed routines. */ | |
335 | ||
336 | static void (*real_func) (lang_input_statement_type *); | |
337 | ||
338 | static void aarch64_for_each_input_file_wrapper (lang_input_statement_type *l) | |
339 | { | |
340 | if (l != stub_file) | |
341 | (*real_func) (l); | |
342 | } | |
343 | ||
344 | static void | |
345 | aarch64_lang_for_each_input_file (void (*func) (lang_input_statement_type *)) | |
346 | { | |
347 | real_func = func; | |
348 | lang_for_each_input_file (&aarch64_for_each_input_file_wrapper); | |
349 | } | |
350 | ||
351 | #define lang_for_each_input_file aarch64_lang_for_each_input_file | |
352 | ||
353 | EOF | |
354 | ||
355 | # Define some shell vars to insert bits of code into the standard elf | |
356 | # parse_args and list_options functions. | |
357 | # | |
358 | PARSE_AND_LIST_PROLOGUE=' | |
359 | #define OPTION_NO_ENUM_SIZE_WARNING 309 | |
360 | #define OPTION_PIC_VENEER 310 | |
6c19b93b | 361 | #define OPTION_STUBGROUP_SIZE 311 |
a06ea964 | 362 | #define OPTION_NO_WCHAR_SIZE_WARNING 312 |
68fcca92 | 363 | #define OPTION_FIX_ERRATUM_835769 313 |
4106101c | 364 | #define OPTION_FIX_ERRATUM_843419 314 |
1f56df9d | 365 | #define OPTION_NO_APPLY_DYNAMIC_RELOCS 315 |
a06ea964 NC |
366 | ' |
367 | ||
368 | PARSE_AND_LIST_SHORTOPTS=p | |
369 | ||
370 | PARSE_AND_LIST_LONGOPTS=' | |
371 | { "no-pipeline-knowledge", no_argument, NULL, '\'p\''}, | |
372 | { "no-enum-size-warning", no_argument, NULL, OPTION_NO_ENUM_SIZE_WARNING}, | |
373 | { "pic-veneer", no_argument, NULL, OPTION_PIC_VENEER}, | |
374 | { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE }, | |
375 | { "no-wchar-size-warning", no_argument, NULL, OPTION_NO_WCHAR_SIZE_WARNING}, | |
68fcca92 | 376 | { "fix-cortex-a53-835769", no_argument, NULL, OPTION_FIX_ERRATUM_835769}, |
4106101c | 377 | { "fix-cortex-a53-843419", no_argument, NULL, OPTION_FIX_ERRATUM_843419}, |
1f56df9d | 378 | { "no-apply-dynamic-relocs", no_argument, NULL, OPTION_NO_APPLY_DYNAMIC_RELOCS}, |
a06ea964 NC |
379 | ' |
380 | ||
381 | PARSE_AND_LIST_OPTIONS=' | |
382 | fprintf (file, _(" --no-enum-size-warning Don'\''t warn about objects with incompatible\n" | |
383 | " enum sizes\n")); | |
384 | fprintf (file, _(" --no-wchar-size-warning Don'\''t warn about objects with incompatible" | |
385 | " wchar_t sizes\n")); | |
386 | fprintf (file, _(" --pic-veneer Always generate PIC interworking veneers\n")); | |
387 | fprintf (file, _("\ | |
df5f2391 AM |
388 | --stub-group-size=N Maximum size of a group of input sections that\n\ |
389 | can be handled by one stub section. A negative\n\ | |
390 | value locates all stubs after their branches\n\ | |
391 | (with a group size of -N), while a positive\n\ | |
392 | value allows two groups of input sections, one\n\ | |
393 | before, and one after each stub section.\n\ | |
394 | Values of +/-1 indicate the linker should\n\ | |
395 | choose suitable defaults.\n")); | |
68fcca92 | 396 | fprintf (file, _(" --fix-cortex-a53-835769 Fix erratum 835769\n")); |
4106101c | 397 | fprintf (file, _(" --fix-cortex-a53-843419 Fix erratum 843419\n")); |
df5f2391 | 398 | fprintf (file, _(" --no-apply-dynamic-relocs Do not apply link-time values for dynamic relocations\n")); |
a06ea964 NC |
399 | ' |
400 | ||
401 | PARSE_AND_LIST_ARGS_CASES=' | |
402 | case '\'p\'': | |
403 | /* Only here for backwards compatibility. */ | |
404 | break; | |
405 | ||
406 | case OPTION_NO_ENUM_SIZE_WARNING: | |
407 | no_enum_size_warning = 1; | |
408 | break; | |
409 | ||
410 | case OPTION_NO_WCHAR_SIZE_WARNING: | |
411 | no_wchar_size_warning = 1; | |
412 | break; | |
413 | ||
414 | case OPTION_PIC_VENEER: | |
415 | pic_veneer = 1; | |
416 | break; | |
417 | ||
68fcca92 JW |
418 | case OPTION_FIX_ERRATUM_835769: |
419 | fix_erratum_835769 = 1; | |
420 | break; | |
421 | ||
4106101c MS |
422 | case OPTION_FIX_ERRATUM_843419: |
423 | fix_erratum_843419 = 1; | |
424 | break; | |
425 | ||
1f56df9d JW |
426 | case OPTION_NO_APPLY_DYNAMIC_RELOCS: |
427 | no_apply_dynamic_relocs = 1; | |
428 | break; | |
429 | ||
a06ea964 NC |
430 | case OPTION_STUBGROUP_SIZE: |
431 | { | |
432 | const char *end; | |
433 | ||
6c19b93b AM |
434 | group_size = bfd_scan_vma (optarg, &end, 0); |
435 | if (*end) | |
df5f2391 | 436 | einfo (_("%F%P: invalid number `%s'\''\n"), optarg); |
a06ea964 NC |
437 | } |
438 | break; | |
439 | ' | |
440 | ||
441 | # We have our own before_allocation etc. functions, but they call | |
442 | # the standard routines, so give them a different name. | |
443 | LDEMUL_BEFORE_ALLOCATION=aarch64_elf_before_allocation | |
444 | LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation | |
445 | LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=aarch64_elf_create_output_section_statements | |
446 | ||
447 | # Replace the elf before_parse function with our own. | |
448 | LDEMUL_BEFORE_PARSE=gld"${EMULATION_NAME}"_before_parse | |
449 | ||
450 | # Call the extra arm-elf function | |
451 | LDEMUL_FINISH=gld${EMULATION_NAME}_finish |