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a06ea964 | 1 | # This shell script emits a C file. -*- C -*- |
b3adc24a | 2 | # Copyright (C) 2009-2020 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 | ||
075a2b89 | 22 | # This file is sourced from elf.em, and defines extra aarch64-elf |
a06ea964 NC |
23 | # specific routines. |
24 | # | |
25 | fragment <<EOF | |
26 | ||
27 | #include "ldctor.h" | |
28 | #include "elf/aarch64.h" | |
a8bfaadb | 29 | #include "elfxx-aarch64.h" |
a06ea964 NC |
30 | |
31 | static int no_enum_size_warning = 0; | |
32 | static int no_wchar_size_warning = 0; | |
33 | static int pic_veneer = 0; | |
68fcca92 | 34 | static int fix_erratum_835769 = 0; |
739b5c9c | 35 | static erratum_84319_opts fix_erratum_843419 = ERRAT_NONE; |
1f56df9d | 36 | static int no_apply_dynamic_relocs = 0; |
37c18eed SD |
37 | static aarch64_plt_type plt_type = PLT_NORMAL; |
38 | static aarch64_enable_bti_type bti_type = BTI_NONE; | |
a06ea964 NC |
39 | |
40 | static void | |
41 | gld${EMULATION_NAME}_before_parse (void) | |
42 | { | |
43 | #ifndef TARGET_ /* I.e., if not generic. */ | |
44 | ldfile_set_output_arch ("`echo ${ARCH}`", bfd_arch_unknown); | |
45 | #endif /* not TARGET_ */ | |
46 | input_flags.dynamic = ${DYNAMIC_LINK-TRUE}; | |
47 | config.has_shared = `if test -n "$GENERATE_SHLIB_SCRIPT" ; then echo TRUE ; else echo FALSE ; fi`; | |
e2caaa1f | 48 | config.separate_code = `if test "x${SEPARATE_CODE}" = xyes ; then echo TRUE ; else echo FALSE ; fi`; |
5c3261b0 | 49 | link_info.check_relocs_after_open_input = TRUE; |
576438f0 | 50 | link_info.relro = DEFAULT_LD_Z_RELRO; |
a06ea964 NC |
51 | } |
52 | ||
53 | static void | |
54 | aarch64_elf_before_allocation (void) | |
55 | { | |
56 | /* We should be able to set the size of the interworking stub section. We | |
57 | can't do it until later if we have dynamic sections, though. */ | |
58 | if (! elf_hash_table (&link_info)->dynamic_sections_created) | |
59 | { | |
60 | /* Here we rummage through the found bfds to collect information. */ | |
61 | LANG_FOR_EACH_INPUT_STATEMENT (is) | |
6c19b93b AM |
62 | { |
63 | /* Initialise mapping tables for code/data. */ | |
64 | bfd_elf${ELFSIZE}_aarch64_init_maps (is->the_bfd); | |
65 | } | |
a06ea964 NC |
66 | } |
67 | ||
68 | /* Call the standard elf routine. */ | |
69 | gld${EMULATION_NAME}_before_allocation (); | |
70 | } | |
71 | ||
72 | /* Fake input file for stubs. */ | |
73 | static lang_input_statement_type *stub_file; | |
74 | ||
75 | /* Whether we need to call gldarm_layout_sections_again. */ | |
76 | static int need_laying_out = 0; | |
77 | ||
78 | /* Maximum size of a group of input sections that can be handled by | |
79 | one stub section. A value of +/-1 indicates the bfd back-end | |
80 | should use a suitable default size. */ | |
81 | static bfd_signed_vma group_size = 1; | |
82 | ||
83 | struct hook_stub_info | |
84 | { | |
85 | lang_statement_list_type add; | |
86 | asection *input_section; | |
87 | }; | |
88 | ||
89 | /* Traverse the linker tree to find the spot where the stub goes. */ | |
90 | ||
91 | static bfd_boolean | |
92 | hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp) | |
93 | { | |
94 | lang_statement_union_type *l; | |
95 | bfd_boolean ret; | |
96 | ||
97 | for (; (l = *lp) != NULL; lp = &l->header.next) | |
98 | { | |
99 | switch (l->header.type) | |
100 | { | |
101 | case lang_constructors_statement_enum: | |
102 | ret = hook_in_stub (info, &constructor_list.head); | |
103 | if (ret) | |
104 | return ret; | |
105 | break; | |
106 | ||
107 | case lang_output_section_statement_enum: | |
108 | ret = hook_in_stub (info, | |
109 | &l->output_section_statement.children.head); | |
110 | if (ret) | |
111 | return ret; | |
112 | break; | |
113 | ||
114 | case lang_wild_statement_enum: | |
115 | ret = hook_in_stub (info, &l->wild_statement.children.head); | |
116 | if (ret) | |
117 | return ret; | |
118 | break; | |
119 | ||
120 | case lang_group_statement_enum: | |
121 | ret = hook_in_stub (info, &l->group_statement.children.head); | |
122 | if (ret) | |
123 | return ret; | |
124 | break; | |
125 | ||
126 | case lang_input_section_enum: | |
127 | if (l->input_section.section == info->input_section) | |
128 | { | |
129 | /* We've found our section. Insert the stub immediately | |
130 | after its associated input section. */ | |
131 | *(info->add.tail) = l->header.next; | |
132 | l->header.next = info->add.head; | |
133 | return TRUE; | |
134 | } | |
135 | break; | |
136 | ||
137 | case lang_data_statement_enum: | |
138 | case lang_reloc_statement_enum: | |
139 | case lang_object_symbols_statement_enum: | |
140 | case lang_output_statement_enum: | |
141 | case lang_target_statement_enum: | |
142 | case lang_input_statement_enum: | |
143 | case lang_assignment_statement_enum: | |
144 | case lang_padding_statement_enum: | |
145 | case lang_address_statement_enum: | |
146 | case lang_fill_statement_enum: | |
147 | break; | |
148 | ||
149 | default: | |
150 | FAIL (); | |
151 | break; | |
152 | } | |
153 | } | |
154 | return FALSE; | |
155 | } | |
156 | ||
157 | ||
4390599b | 158 | /* Call-back for elf${ELFSIZE}_aarch64_size_stubs. */ |
a06ea964 NC |
159 | |
160 | /* Create a new stub section, and arrange for it to be linked | |
161 | immediately after INPUT_SECTION. */ | |
162 | ||
163 | static asection * | |
4390599b | 164 | elf${ELFSIZE}_aarch64_add_stub_section (const char *stub_sec_name, |
499c37b5 | 165 | asection *input_section) |
a06ea964 NC |
166 | { |
167 | asection *stub_sec; | |
168 | flagword flags; | |
169 | asection *output_section; | |
a06ea964 NC |
170 | lang_output_section_statement_type *os; |
171 | struct hook_stub_info info; | |
172 | ||
0db131fb | 173 | flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE |
a06ea964 NC |
174 | | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP); |
175 | stub_sec = bfd_make_section_anyway_with_flags (stub_file->the_bfd, | |
176 | stub_sec_name, flags); | |
177 | if (stub_sec == NULL) | |
178 | goto err_ret; | |
179 | ||
9a2ebffd JW |
180 | /* Long branch stubs contain a 64-bit address, so the section requires |
181 | 8 byte alignment. */ | |
fd361982 | 182 | bfd_set_section_alignment (stub_sec, 3); |
a06ea964 NC |
183 | |
184 | output_section = input_section->output_section; | |
24ef1aa7 | 185 | os = lang_output_section_get (output_section); |
a06ea964 NC |
186 | |
187 | info.input_section = input_section; | |
188 | lang_list_init (&info.add); | |
189 | lang_add_section (&info.add, stub_sec, NULL, os); | |
190 | ||
191 | if (info.add.head == NULL) | |
192 | goto err_ret; | |
193 | ||
194 | if (hook_in_stub (&info, &os->children.head)) | |
195 | return stub_sec; | |
196 | ||
197 | err_ret: | |
d003af55 | 198 | einfo (_("%X%P: can not make stub section: %E\n")); |
a06ea964 NC |
199 | return NULL; |
200 | } | |
201 | ||
4390599b | 202 | /* Another call-back for elf${ELFSIZE}_aarch64_size_stubs. */ |
a06ea964 NC |
203 | |
204 | static void | |
205 | gldaarch64_layout_sections_again (void) | |
206 | { | |
207 | /* If we have changed sizes of the stub sections, then we need | |
208 | to recalculate all the section offsets. This may mean we need to | |
209 | add even more stubs. */ | |
d871d478 | 210 | ldelf_map_segments (TRUE); |
a06ea964 NC |
211 | need_laying_out = -1; |
212 | } | |
213 | ||
214 | static void | |
215 | build_section_lists (lang_statement_union_type *statement) | |
216 | { | |
217 | if (statement->header.type == lang_input_section_enum) | |
218 | { | |
219 | asection *i = statement->input_section.section; | |
220 | ||
00f93c44 | 221 | if (!bfd_input_just_syms (i->owner) |
a06ea964 NC |
222 | && (i->flags & SEC_EXCLUDE) == 0 |
223 | && i->output_section != NULL | |
224 | && i->output_section->owner == link_info.output_bfd) | |
4390599b | 225 | elf${ELFSIZE}_aarch64_next_input_section (& link_info, i); |
a06ea964 NC |
226 | } |
227 | } | |
228 | ||
229 | static void | |
230 | gld${EMULATION_NAME}_after_allocation (void) | |
231 | { | |
75938853 AM |
232 | int ret; |
233 | ||
a06ea964 NC |
234 | /* bfd_elf32_discard_info just plays with debugging sections, |
235 | ie. doesn't affect any code, so we can delay resizing the | |
236 | sections. It's likely we'll resize everything in the process of | |
237 | adding stubs. */ | |
75938853 AM |
238 | ret = bfd_elf_discard_info (link_info.output_bfd, & link_info); |
239 | if (ret < 0) | |
240 | { | |
d003af55 | 241 | einfo (_("%X%P: .eh_frame/.stab edit: %E\n")); |
75938853 AM |
242 | return; |
243 | } | |
244 | else if (ret > 0) | |
a06ea964 NC |
245 | need_laying_out = 1; |
246 | ||
247 | /* If generating a relocatable output file, then we don't | |
248 | have to examine the relocs. */ | |
0e1862bb | 249 | if (stub_file != NULL && !bfd_link_relocatable (&link_info)) |
a06ea964 | 250 | { |
75938853 AM |
251 | ret = elf${ELFSIZE}_aarch64_setup_section_lists (link_info.output_bfd, |
252 | &link_info); | |
a06ea964 NC |
253 | if (ret != 0) |
254 | { | |
255 | if (ret < 0) | |
256 | { | |
d003af55 AM |
257 | einfo (_("%X%P: could not compute sections lists " |
258 | "for stub generation: %E\n")); | |
a06ea964 NC |
259 | return; |
260 | } | |
261 | ||
262 | lang_for_each_statement (build_section_lists); | |
263 | ||
264 | /* Call into the BFD backend to do the real work. */ | |
4390599b | 265 | if (! elf${ELFSIZE}_aarch64_size_stubs (link_info.output_bfd, |
a06ea964 NC |
266 | stub_file->the_bfd, |
267 | & link_info, | |
268 | group_size, | |
4390599b | 269 | & elf${ELFSIZE}_aarch64_add_stub_section, |
a06ea964 NC |
270 | & gldaarch64_layout_sections_again)) |
271 | { | |
df5f2391 | 272 | einfo (_("%X%P: can not size stub section: %E\n")); |
a06ea964 NC |
273 | return; |
274 | } | |
275 | } | |
276 | } | |
277 | ||
278 | if (need_laying_out != -1) | |
d871d478 | 279 | ldelf_map_segments (need_laying_out); |
a06ea964 NC |
280 | } |
281 | ||
282 | static void | |
283 | gld${EMULATION_NAME}_finish (void) | |
284 | { | |
0e1862bb | 285 | if (!bfd_link_relocatable (&link_info)) |
a06ea964 NC |
286 | { |
287 | /* Now build the linker stubs. */ | |
288 | if (stub_file->the_bfd->sections != NULL) | |
289 | { | |
4390599b | 290 | if (! elf${ELFSIZE}_aarch64_build_stubs (& link_info)) |
d003af55 | 291 | einfo (_("%X%P: can not build stubs: %E\n")); |
a06ea964 NC |
292 | } |
293 | } | |
294 | ||
295 | finish_default (); | |
296 | } | |
297 | ||
298 | /* This is a convenient point to tell BFD about target specific flags. | |
299 | After the output has been created, but before inputs are read. */ | |
300 | static void | |
301 | aarch64_elf_create_output_section_statements (void) | |
302 | { | |
303 | if (strstr (bfd_get_target (link_info.output_bfd), "aarch64") == NULL) | |
304 | { | |
305 | /* The arm backend needs special fields in the output hash structure. | |
306 | These will only be created if the output format is an arm format, | |
307 | hence we do not support linking and changing output formats at the | |
308 | same time. Use a link followed by objcopy to change output formats. */ | |
df5f2391 AM |
309 | einfo (_("%F%P: error: cannot change output format " |
310 | "whilst linking %s binaries\n"), "AArch64"); | |
a06ea964 NC |
311 | return; |
312 | } | |
313 | ||
37c18eed SD |
314 | aarch64_bti_pac_info bp_info; |
315 | bp_info.plt_type = plt_type; | |
316 | bp_info.bti_type = bti_type; | |
317 | ||
4390599b | 318 | bfd_elf${ELFSIZE}_aarch64_set_options (link_info.output_bfd, &link_info, |
a06ea964 NC |
319 | no_enum_size_warning, |
320 | no_wchar_size_warning, | |
4106101c | 321 | pic_veneer, |
1f56df9d | 322 | fix_erratum_835769, fix_erratum_843419, |
37c18eed SD |
323 | no_apply_dynamic_relocs, |
324 | bp_info); | |
a06ea964 NC |
325 | |
326 | stub_file = lang_add_input_file ("linker stubs", | |
327 | lang_input_file_is_fake_enum, | |
328 | NULL); | |
329 | stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd); | |
330 | if (stub_file->the_bfd == NULL | |
331 | || ! bfd_set_arch_mach (stub_file->the_bfd, | |
332 | bfd_get_arch (link_info.output_bfd), | |
333 | bfd_get_mach (link_info.output_bfd))) | |
334 | { | |
df5f2391 | 335 | einfo (_("%F%P: can not create BFD: %E\n")); |
a06ea964 NC |
336 | return; |
337 | } | |
338 | ||
339 | stub_file->the_bfd->flags |= BFD_LINKER_CREATED; | |
340 | ldlang_add_file (stub_file); | |
341 | } | |
342 | ||
a06ea964 NC |
343 | EOF |
344 | ||
345 | # Define some shell vars to insert bits of code into the standard elf | |
346 | # parse_args and list_options functions. | |
347 | # | |
348 | PARSE_AND_LIST_PROLOGUE=' | |
349 | #define OPTION_NO_ENUM_SIZE_WARNING 309 | |
350 | #define OPTION_PIC_VENEER 310 | |
6c19b93b | 351 | #define OPTION_STUBGROUP_SIZE 311 |
a06ea964 | 352 | #define OPTION_NO_WCHAR_SIZE_WARNING 312 |
68fcca92 | 353 | #define OPTION_FIX_ERRATUM_835769 313 |
4106101c | 354 | #define OPTION_FIX_ERRATUM_843419 314 |
1f56df9d | 355 | #define OPTION_NO_APPLY_DYNAMIC_RELOCS 315 |
a06ea964 NC |
356 | ' |
357 | ||
358 | PARSE_AND_LIST_SHORTOPTS=p | |
359 | ||
360 | PARSE_AND_LIST_LONGOPTS=' | |
361 | { "no-pipeline-knowledge", no_argument, NULL, '\'p\''}, | |
362 | { "no-enum-size-warning", no_argument, NULL, OPTION_NO_ENUM_SIZE_WARNING}, | |
363 | { "pic-veneer", no_argument, NULL, OPTION_PIC_VENEER}, | |
364 | { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE }, | |
365 | { "no-wchar-size-warning", no_argument, NULL, OPTION_NO_WCHAR_SIZE_WARNING}, | |
68fcca92 | 366 | { "fix-cortex-a53-835769", no_argument, NULL, OPTION_FIX_ERRATUM_835769}, |
739b5c9c | 367 | { "fix-cortex-a53-843419", optional_argument, NULL, OPTION_FIX_ERRATUM_843419}, |
1f56df9d | 368 | { "no-apply-dynamic-relocs", no_argument, NULL, OPTION_NO_APPLY_DYNAMIC_RELOCS}, |
a06ea964 NC |
369 | ' |
370 | ||
371 | PARSE_AND_LIST_OPTIONS=' | |
372 | fprintf (file, _(" --no-enum-size-warning Don'\''t warn about objects with incompatible\n" | |
373 | " enum sizes\n")); | |
eca4b721 | 374 | fprintf (file, _(" --no-wchar-size-warning Don'\''t warn about objects with incompatible\n" |
a06ea964 NC |
375 | " wchar_t sizes\n")); |
376 | fprintf (file, _(" --pic-veneer Always generate PIC interworking veneers\n")); | |
377 | fprintf (file, _("\ | |
df5f2391 AM |
378 | --stub-group-size=N Maximum size of a group of input sections that\n\ |
379 | can be handled by one stub section. A negative\n\ | |
380 | value locates all stubs after their branches\n\ | |
381 | (with a group size of -N), while a positive\n\ | |
382 | value allows two groups of input sections, one\n\ | |
383 | before, and one after each stub section.\n\ | |
384 | Values of +/-1 indicate the linker should\n\ | |
385 | choose suitable defaults.\n")); | |
68fcca92 | 386 | fprintf (file, _(" --fix-cortex-a53-835769 Fix erratum 835769\n")); |
739b5c9c TC |
387 | fprintf (file, _("\ |
388 | --fix-cortex-a53-843419[=full|adr|adrp] Fix erratum 843419 and optionally specify which workaround to use.\n\ | |
389 | full (default): Use both ADRP and ADR workaround, this will \n\ | |
390 | increase the size of your binaries.\n\ | |
391 | adr: Only use the ADR workaround, this will not cause any increase\n\ | |
392 | in binary size but linking will fail if the referenced address is\n\ | |
393 | out of range of an ADR instruction. This will remove the need of using\n\ | |
394 | a veneer and results in both performance and size benefits.\n\ | |
395 | adrp: Use only the ADRP workaround, this will never rewrite your ADRP\n\ | |
396 | instruction into an ADR. As such the workaround will always use a\n\ | |
397 | veneer and this will give you both a performance and size overhead.\n")); | |
df5f2391 | 398 | fprintf (file, _(" --no-apply-dynamic-relocs Do not apply link-time values for dynamic relocations\n")); |
8bf6d176 SD |
399 | fprintf (file, _(" -z force-bti Turn on Branch Target Identification mechanism and generate PLTs with BTI. Generate warnings for missing BTI on inputs\n")); |
400 | fprintf (file, _(" -z pac-plt Protect PLTs with Pointer Authentication.\n")); | |
a06ea964 NC |
401 | ' |
402 | ||
8bf6d176 SD |
403 | PARSE_AND_LIST_ARGS_CASE_Z_AARCH64=' |
404 | else if (strcmp (optarg, "force-bti") == 0) | |
405 | { | |
406 | plt_type |= PLT_BTI; | |
407 | bti_type = BTI_WARN; | |
408 | } | |
409 | else if (strcmp (optarg, "pac-plt") == 0) | |
410 | plt_type |= PLT_PAC; | |
411 | ' | |
412 | PARSE_AND_LIST_ARGS_CASE_Z="$PARSE_AND_LIST_ARGS_CASE_Z $PARSE_AND_LIST_ARGS_CASE_Z_AARCH64" | |
413 | ||
a06ea964 NC |
414 | PARSE_AND_LIST_ARGS_CASES=' |
415 | case '\'p\'': | |
416 | /* Only here for backwards compatibility. */ | |
417 | break; | |
418 | ||
419 | case OPTION_NO_ENUM_SIZE_WARNING: | |
420 | no_enum_size_warning = 1; | |
421 | break; | |
422 | ||
423 | case OPTION_NO_WCHAR_SIZE_WARNING: | |
424 | no_wchar_size_warning = 1; | |
425 | break; | |
426 | ||
427 | case OPTION_PIC_VENEER: | |
428 | pic_veneer = 1; | |
429 | break; | |
430 | ||
68fcca92 JW |
431 | case OPTION_FIX_ERRATUM_835769: |
432 | fix_erratum_835769 = 1; | |
433 | break; | |
434 | ||
4106101c | 435 | case OPTION_FIX_ERRATUM_843419: |
739b5c9c TC |
436 | fix_erratum_843419 = ERRAT_ADR | ERRAT_ADRP; |
437 | if (optarg && *optarg) | |
438 | { | |
439 | if (strcmp ("full", optarg) == 0) | |
440 | fix_erratum_843419 = ERRAT_ADR | ERRAT_ADRP; | |
441 | else if (strcmp ("adrp", optarg) == 0) | |
442 | fix_erratum_843419 = ERRAT_ADRP; | |
443 | else if (strcmp ("adr", optarg) == 0) | |
444 | fix_erratum_843419 = ERRAT_ADR; | |
445 | else | |
446 | einfo (_("%P: error: unrecognized option for " | |
447 | "--fix-cortex-a53-843419: %s\n"), optarg); | |
448 | } | |
4106101c MS |
449 | break; |
450 | ||
1f56df9d JW |
451 | case OPTION_NO_APPLY_DYNAMIC_RELOCS: |
452 | no_apply_dynamic_relocs = 1; | |
453 | break; | |
454 | ||
a06ea964 NC |
455 | case OPTION_STUBGROUP_SIZE: |
456 | { | |
457 | const char *end; | |
458 | ||
6c19b93b AM |
459 | group_size = bfd_scan_vma (optarg, &end, 0); |
460 | if (*end) | |
df5f2391 | 461 | einfo (_("%F%P: invalid number `%s'\''\n"), optarg); |
a06ea964 NC |
462 | } |
463 | break; | |
464 | ' | |
465 | ||
466 | # We have our own before_allocation etc. functions, but they call | |
467 | # the standard routines, so give them a different name. | |
468 | LDEMUL_BEFORE_ALLOCATION=aarch64_elf_before_allocation | |
469 | LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation | |
470 | LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=aarch64_elf_create_output_section_statements | |
471 | ||
472 | # Replace the elf before_parse function with our own. | |
473 | LDEMUL_BEFORE_PARSE=gld"${EMULATION_NAME}"_before_parse | |
474 | ||
475 | # Call the extra arm-elf function | |
476 | LDEMUL_FINISH=gld${EMULATION_NAME}_finish |