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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${ELFSIZE}_aarch64_add_stub_section (const char *stub_sec_name, |
499c37b5 | 162 | asection *input_section) |
a06ea964 NC |
163 | { |
164 | asection *stub_sec; | |
165 | flagword flags; | |
166 | asection *output_section; | |
a06ea964 NC |
167 | lang_output_section_statement_type *os; |
168 | struct hook_stub_info info; | |
169 | ||
170 | flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE | |
171 | | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP); | |
172 | stub_sec = bfd_make_section_anyway_with_flags (stub_file->the_bfd, | |
173 | stub_sec_name, flags); | |
174 | if (stub_sec == NULL) | |
175 | goto err_ret; | |
176 | ||
9a2ebffd JW |
177 | /* Long branch stubs contain a 64-bit address, so the section requires |
178 | 8 byte alignment. */ | |
179 | bfd_set_section_alignment (stub_file->the_bfd, stub_sec, 3); | |
a06ea964 NC |
180 | |
181 | output_section = input_section->output_section; | |
24ef1aa7 | 182 | os = lang_output_section_get (output_section); |
a06ea964 NC |
183 | |
184 | info.input_section = input_section; | |
185 | lang_list_init (&info.add); | |
186 | lang_add_section (&info.add, stub_sec, NULL, os); | |
187 | ||
188 | if (info.add.head == NULL) | |
189 | goto err_ret; | |
190 | ||
191 | if (hook_in_stub (&info, &os->children.head)) | |
192 | return stub_sec; | |
193 | ||
194 | err_ret: | |
d003af55 | 195 | einfo (_("%X%P: can not make stub section: %E\n")); |
a06ea964 NC |
196 | return NULL; |
197 | } | |
198 | ||
4390599b | 199 | /* Another call-back for elf${ELFSIZE}_aarch64_size_stubs. */ |
a06ea964 NC |
200 | |
201 | static void | |
202 | gldaarch64_layout_sections_again (void) | |
203 | { | |
204 | /* If we have changed sizes of the stub sections, then we need | |
205 | to recalculate all the section offsets. This may mean we need to | |
206 | add even more stubs. */ | |
207 | gld${EMULATION_NAME}_map_segments (TRUE); | |
208 | need_laying_out = -1; | |
209 | } | |
210 | ||
211 | static void | |
212 | build_section_lists (lang_statement_union_type *statement) | |
213 | { | |
214 | if (statement->header.type == lang_input_section_enum) | |
215 | { | |
216 | asection *i = statement->input_section.section; | |
217 | ||
218 | if (!((lang_input_statement_type *) i->owner->usrdata)->flags.just_syms | |
219 | && (i->flags & SEC_EXCLUDE) == 0 | |
220 | && i->output_section != NULL | |
221 | && i->output_section->owner == link_info.output_bfd) | |
4390599b | 222 | elf${ELFSIZE}_aarch64_next_input_section (& link_info, i); |
a06ea964 NC |
223 | } |
224 | } | |
225 | ||
226 | static void | |
227 | gld${EMULATION_NAME}_after_allocation (void) | |
228 | { | |
75938853 AM |
229 | int ret; |
230 | ||
a06ea964 NC |
231 | /* bfd_elf32_discard_info just plays with debugging sections, |
232 | ie. doesn't affect any code, so we can delay resizing the | |
233 | sections. It's likely we'll resize everything in the process of | |
234 | adding stubs. */ | |
75938853 AM |
235 | ret = bfd_elf_discard_info (link_info.output_bfd, & link_info); |
236 | if (ret < 0) | |
237 | { | |
d003af55 | 238 | einfo (_("%X%P: .eh_frame/.stab edit: %E\n")); |
75938853 AM |
239 | return; |
240 | } | |
241 | else if (ret > 0) | |
a06ea964 NC |
242 | need_laying_out = 1; |
243 | ||
244 | /* If generating a relocatable output file, then we don't | |
245 | have to examine the relocs. */ | |
0e1862bb | 246 | if (stub_file != NULL && !bfd_link_relocatable (&link_info)) |
a06ea964 | 247 | { |
75938853 AM |
248 | ret = elf${ELFSIZE}_aarch64_setup_section_lists (link_info.output_bfd, |
249 | &link_info); | |
a06ea964 NC |
250 | if (ret != 0) |
251 | { | |
252 | if (ret < 0) | |
253 | { | |
d003af55 AM |
254 | einfo (_("%X%P: could not compute sections lists " |
255 | "for stub generation: %E\n")); | |
a06ea964 NC |
256 | return; |
257 | } | |
258 | ||
259 | lang_for_each_statement (build_section_lists); | |
260 | ||
261 | /* Call into the BFD backend to do the real work. */ | |
4390599b | 262 | if (! elf${ELFSIZE}_aarch64_size_stubs (link_info.output_bfd, |
a06ea964 NC |
263 | stub_file->the_bfd, |
264 | & link_info, | |
265 | group_size, | |
4390599b | 266 | & elf${ELFSIZE}_aarch64_add_stub_section, |
a06ea964 NC |
267 | & gldaarch64_layout_sections_again)) |
268 | { | |
df5f2391 | 269 | einfo (_("%X%P: can not size stub section: %E\n")); |
a06ea964 NC |
270 | return; |
271 | } | |
272 | } | |
273 | } | |
274 | ||
275 | if (need_laying_out != -1) | |
276 | gld${EMULATION_NAME}_map_segments (need_laying_out); | |
277 | } | |
278 | ||
279 | static void | |
280 | gld${EMULATION_NAME}_finish (void) | |
281 | { | |
0e1862bb | 282 | if (!bfd_link_relocatable (&link_info)) |
a06ea964 NC |
283 | { |
284 | /* Now build the linker stubs. */ | |
285 | if (stub_file->the_bfd->sections != NULL) | |
286 | { | |
4390599b | 287 | if (! elf${ELFSIZE}_aarch64_build_stubs (& link_info)) |
d003af55 | 288 | einfo (_("%X%P: can not build stubs: %E\n")); |
a06ea964 NC |
289 | } |
290 | } | |
291 | ||
292 | finish_default (); | |
293 | } | |
294 | ||
295 | /* This is a convenient point to tell BFD about target specific flags. | |
296 | After the output has been created, but before inputs are read. */ | |
297 | static void | |
298 | aarch64_elf_create_output_section_statements (void) | |
299 | { | |
300 | if (strstr (bfd_get_target (link_info.output_bfd), "aarch64") == NULL) | |
301 | { | |
302 | /* The arm backend needs special fields in the output hash structure. | |
303 | These will only be created if the output format is an arm format, | |
304 | hence we do not support linking and changing output formats at the | |
305 | same time. Use a link followed by objcopy to change output formats. */ | |
df5f2391 AM |
306 | einfo (_("%F%P: error: cannot change output format " |
307 | "whilst linking %s binaries\n"), "AArch64"); | |
a06ea964 NC |
308 | return; |
309 | } | |
310 | ||
4390599b | 311 | bfd_elf${ELFSIZE}_aarch64_set_options (link_info.output_bfd, &link_info, |
a06ea964 NC |
312 | no_enum_size_warning, |
313 | no_wchar_size_warning, | |
4106101c | 314 | pic_veneer, |
1f56df9d JW |
315 | fix_erratum_835769, fix_erratum_843419, |
316 | no_apply_dynamic_relocs); | |
a06ea964 NC |
317 | |
318 | stub_file = lang_add_input_file ("linker stubs", | |
319 | lang_input_file_is_fake_enum, | |
320 | NULL); | |
321 | stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd); | |
322 | if (stub_file->the_bfd == NULL | |
323 | || ! bfd_set_arch_mach (stub_file->the_bfd, | |
324 | bfd_get_arch (link_info.output_bfd), | |
325 | bfd_get_mach (link_info.output_bfd))) | |
326 | { | |
df5f2391 | 327 | einfo (_("%F%P: can not create BFD: %E\n")); |
a06ea964 NC |
328 | return; |
329 | } | |
330 | ||
331 | stub_file->the_bfd->flags |= BFD_LINKER_CREATED; | |
332 | ldlang_add_file (stub_file); | |
333 | } | |
334 | ||
335 | /* Avoid processing the fake stub_file in vercheck, stat_needed and | |
336 | check_needed routines. */ | |
337 | ||
338 | static void (*real_func) (lang_input_statement_type *); | |
339 | ||
340 | static void aarch64_for_each_input_file_wrapper (lang_input_statement_type *l) | |
341 | { | |
342 | if (l != stub_file) | |
343 | (*real_func) (l); | |
344 | } | |
345 | ||
346 | static void | |
347 | aarch64_lang_for_each_input_file (void (*func) (lang_input_statement_type *)) | |
348 | { | |
349 | real_func = func; | |
350 | lang_for_each_input_file (&aarch64_for_each_input_file_wrapper); | |
351 | } | |
352 | ||
353 | #define lang_for_each_input_file aarch64_lang_for_each_input_file | |
354 | ||
355 | EOF | |
356 | ||
357 | # Define some shell vars to insert bits of code into the standard elf | |
358 | # parse_args and list_options functions. | |
359 | # | |
360 | PARSE_AND_LIST_PROLOGUE=' | |
361 | #define OPTION_NO_ENUM_SIZE_WARNING 309 | |
362 | #define OPTION_PIC_VENEER 310 | |
6c19b93b | 363 | #define OPTION_STUBGROUP_SIZE 311 |
a06ea964 | 364 | #define OPTION_NO_WCHAR_SIZE_WARNING 312 |
68fcca92 | 365 | #define OPTION_FIX_ERRATUM_835769 313 |
4106101c | 366 | #define OPTION_FIX_ERRATUM_843419 314 |
1f56df9d | 367 | #define OPTION_NO_APPLY_DYNAMIC_RELOCS 315 |
a06ea964 NC |
368 | ' |
369 | ||
370 | PARSE_AND_LIST_SHORTOPTS=p | |
371 | ||
372 | PARSE_AND_LIST_LONGOPTS=' | |
373 | { "no-pipeline-knowledge", no_argument, NULL, '\'p\''}, | |
374 | { "no-enum-size-warning", no_argument, NULL, OPTION_NO_ENUM_SIZE_WARNING}, | |
375 | { "pic-veneer", no_argument, NULL, OPTION_PIC_VENEER}, | |
376 | { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE }, | |
377 | { "no-wchar-size-warning", no_argument, NULL, OPTION_NO_WCHAR_SIZE_WARNING}, | |
68fcca92 | 378 | { "fix-cortex-a53-835769", no_argument, NULL, OPTION_FIX_ERRATUM_835769}, |
4106101c | 379 | { "fix-cortex-a53-843419", no_argument, NULL, OPTION_FIX_ERRATUM_843419}, |
1f56df9d | 380 | { "no-apply-dynamic-relocs", no_argument, NULL, OPTION_NO_APPLY_DYNAMIC_RELOCS}, |
a06ea964 NC |
381 | ' |
382 | ||
383 | PARSE_AND_LIST_OPTIONS=' | |
384 | fprintf (file, _(" --no-enum-size-warning Don'\''t warn about objects with incompatible\n" | |
385 | " enum sizes\n")); | |
386 | fprintf (file, _(" --no-wchar-size-warning Don'\''t warn about objects with incompatible" | |
387 | " wchar_t sizes\n")); | |
388 | fprintf (file, _(" --pic-veneer Always generate PIC interworking veneers\n")); | |
389 | fprintf (file, _("\ | |
df5f2391 AM |
390 | --stub-group-size=N Maximum size of a group of input sections that\n\ |
391 | can be handled by one stub section. A negative\n\ | |
392 | value locates all stubs after their branches\n\ | |
393 | (with a group size of -N), while a positive\n\ | |
394 | value allows two groups of input sections, one\n\ | |
395 | before, and one after each stub section.\n\ | |
396 | Values of +/-1 indicate the linker should\n\ | |
397 | choose suitable defaults.\n")); | |
68fcca92 | 398 | fprintf (file, _(" --fix-cortex-a53-835769 Fix erratum 835769\n")); |
4106101c | 399 | fprintf (file, _(" --fix-cortex-a53-843419 Fix erratum 843419\n")); |
df5f2391 | 400 | fprintf (file, _(" --no-apply-dynamic-relocs Do not apply link-time values for dynamic relocations\n")); |
a06ea964 NC |
401 | ' |
402 | ||
403 | PARSE_AND_LIST_ARGS_CASES=' | |
404 | case '\'p\'': | |
405 | /* Only here for backwards compatibility. */ | |
406 | break; | |
407 | ||
408 | case OPTION_NO_ENUM_SIZE_WARNING: | |
409 | no_enum_size_warning = 1; | |
410 | break; | |
411 | ||
412 | case OPTION_NO_WCHAR_SIZE_WARNING: | |
413 | no_wchar_size_warning = 1; | |
414 | break; | |
415 | ||
416 | case OPTION_PIC_VENEER: | |
417 | pic_veneer = 1; | |
418 | break; | |
419 | ||
68fcca92 JW |
420 | case OPTION_FIX_ERRATUM_835769: |
421 | fix_erratum_835769 = 1; | |
422 | break; | |
423 | ||
4106101c MS |
424 | case OPTION_FIX_ERRATUM_843419: |
425 | fix_erratum_843419 = 1; | |
426 | break; | |
427 | ||
1f56df9d JW |
428 | case OPTION_NO_APPLY_DYNAMIC_RELOCS: |
429 | no_apply_dynamic_relocs = 1; | |
430 | break; | |
431 | ||
a06ea964 NC |
432 | case OPTION_STUBGROUP_SIZE: |
433 | { | |
434 | const char *end; | |
435 | ||
6c19b93b AM |
436 | group_size = bfd_scan_vma (optarg, &end, 0); |
437 | if (*end) | |
df5f2391 | 438 | einfo (_("%F%P: invalid number `%s'\''\n"), optarg); |
a06ea964 NC |
439 | } |
440 | break; | |
441 | ' | |
442 | ||
443 | # We have our own before_allocation etc. functions, but they call | |
444 | # the standard routines, so give them a different name. | |
445 | LDEMUL_BEFORE_ALLOCATION=aarch64_elf_before_allocation | |
446 | LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation | |
447 | LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=aarch64_elf_create_output_section_statements | |
448 | ||
449 | # Replace the elf before_parse function with our own. | |
450 | LDEMUL_BEFORE_PARSE=gld"${EMULATION_NAME}"_before_parse | |
451 | ||
452 | # Call the extra arm-elf function | |
453 | LDEMUL_FINISH=gld${EMULATION_NAME}_finish |