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a06ea964 | 1 | # This shell script emits a C file. -*- C -*- |
2571583a | 2 | # Copyright (C) 2009-2017 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${SEPARATE_CODE}" = xyes ; then echo TRUE ; else echo FALSE ; fi`; |
576438f0 | 46 | link_info.relro = DEFAULT_LD_Z_RELRO; |
a06ea964 NC |
47 | } |
48 | ||
49 | static void | |
50 | aarch64_elf_before_allocation (void) | |
51 | { | |
52 | /* We should be able to set the size of the interworking stub section. We | |
53 | can't do it until later if we have dynamic sections, though. */ | |
54 | if (! elf_hash_table (&link_info)->dynamic_sections_created) | |
55 | { | |
56 | /* Here we rummage through the found bfds to collect information. */ | |
57 | LANG_FOR_EACH_INPUT_STATEMENT (is) | |
58 | { | |
59 | /* Initialise mapping tables for code/data. */ | |
4390599b | 60 | bfd_elf${ELFSIZE}_aarch64_init_maps (is->the_bfd); |
a06ea964 NC |
61 | } |
62 | } | |
63 | ||
64 | /* Call the standard elf routine. */ | |
65 | gld${EMULATION_NAME}_before_allocation (); | |
66 | } | |
67 | ||
68 | /* Fake input file for stubs. */ | |
69 | static lang_input_statement_type *stub_file; | |
70 | ||
71 | /* Whether we need to call gldarm_layout_sections_again. */ | |
72 | static int need_laying_out = 0; | |
73 | ||
74 | /* Maximum size of a group of input sections that can be handled by | |
75 | one stub section. A value of +/-1 indicates the bfd back-end | |
76 | should use a suitable default size. */ | |
77 | static bfd_signed_vma group_size = 1; | |
78 | ||
79 | struct hook_stub_info | |
80 | { | |
81 | lang_statement_list_type add; | |
82 | asection *input_section; | |
83 | }; | |
84 | ||
85 | /* Traverse the linker tree to find the spot where the stub goes. */ | |
86 | ||
87 | static bfd_boolean | |
88 | hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp) | |
89 | { | |
90 | lang_statement_union_type *l; | |
91 | bfd_boolean ret; | |
92 | ||
93 | for (; (l = *lp) != NULL; lp = &l->header.next) | |
94 | { | |
95 | switch (l->header.type) | |
96 | { | |
97 | case lang_constructors_statement_enum: | |
98 | ret = hook_in_stub (info, &constructor_list.head); | |
99 | if (ret) | |
100 | return ret; | |
101 | break; | |
102 | ||
103 | case lang_output_section_statement_enum: | |
104 | ret = hook_in_stub (info, | |
105 | &l->output_section_statement.children.head); | |
106 | if (ret) | |
107 | return ret; | |
108 | break; | |
109 | ||
110 | case lang_wild_statement_enum: | |
111 | ret = hook_in_stub (info, &l->wild_statement.children.head); | |
112 | if (ret) | |
113 | return ret; | |
114 | break; | |
115 | ||
116 | case lang_group_statement_enum: | |
117 | ret = hook_in_stub (info, &l->group_statement.children.head); | |
118 | if (ret) | |
119 | return ret; | |
120 | break; | |
121 | ||
122 | case lang_input_section_enum: | |
123 | if (l->input_section.section == info->input_section) | |
124 | { | |
125 | /* We've found our section. Insert the stub immediately | |
126 | after its associated input section. */ | |
127 | *(info->add.tail) = l->header.next; | |
128 | l->header.next = info->add.head; | |
129 | return TRUE; | |
130 | } | |
131 | break; | |
132 | ||
133 | case lang_data_statement_enum: | |
134 | case lang_reloc_statement_enum: | |
135 | case lang_object_symbols_statement_enum: | |
136 | case lang_output_statement_enum: | |
137 | case lang_target_statement_enum: | |
138 | case lang_input_statement_enum: | |
139 | case lang_assignment_statement_enum: | |
140 | case lang_padding_statement_enum: | |
141 | case lang_address_statement_enum: | |
142 | case lang_fill_statement_enum: | |
143 | break; | |
144 | ||
145 | default: | |
146 | FAIL (); | |
147 | break; | |
148 | } | |
149 | } | |
150 | return FALSE; | |
151 | } | |
152 | ||
153 | ||
4390599b | 154 | /* Call-back for elf${ELFSIZE}_aarch64_size_stubs. */ |
a06ea964 NC |
155 | |
156 | /* Create a new stub section, and arrange for it to be linked | |
157 | immediately after INPUT_SECTION. */ | |
158 | ||
159 | static asection * | |
4390599b | 160 | elf${ELFSIZE}_aarch64_add_stub_section (const char *stub_sec_name, |
499c37b5 | 161 | asection *input_section) |
a06ea964 NC |
162 | { |
163 | asection *stub_sec; | |
164 | flagword flags; | |
165 | asection *output_section; | |
a06ea964 NC |
166 | lang_output_section_statement_type *os; |
167 | struct hook_stub_info info; | |
168 | ||
169 | flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE | |
170 | | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP); | |
171 | stub_sec = bfd_make_section_anyway_with_flags (stub_file->the_bfd, | |
172 | stub_sec_name, flags); | |
173 | if (stub_sec == NULL) | |
174 | goto err_ret; | |
175 | ||
d9ced15d | 176 | bfd_set_section_alignment (stub_file->the_bfd, stub_sec, 2); |
a06ea964 NC |
177 | |
178 | output_section = input_section->output_section; | |
24ef1aa7 | 179 | os = lang_output_section_get (output_section); |
a06ea964 NC |
180 | |
181 | info.input_section = input_section; | |
182 | lang_list_init (&info.add); | |
183 | lang_add_section (&info.add, stub_sec, NULL, os); | |
184 | ||
185 | if (info.add.head == NULL) | |
186 | goto err_ret; | |
187 | ||
188 | if (hook_in_stub (&info, &os->children.head)) | |
189 | return stub_sec; | |
190 | ||
191 | err_ret: | |
d003af55 | 192 | einfo (_("%X%P: can not make stub section: %E\n")); |
a06ea964 NC |
193 | return NULL; |
194 | } | |
195 | ||
4390599b | 196 | /* Another call-back for elf${ELFSIZE}_aarch64_size_stubs. */ |
a06ea964 NC |
197 | |
198 | static void | |
199 | gldaarch64_layout_sections_again (void) | |
200 | { | |
201 | /* If we have changed sizes of the stub sections, then we need | |
202 | to recalculate all the section offsets. This may mean we need to | |
203 | add even more stubs. */ | |
204 | gld${EMULATION_NAME}_map_segments (TRUE); | |
205 | need_laying_out = -1; | |
206 | } | |
207 | ||
208 | static void | |
209 | build_section_lists (lang_statement_union_type *statement) | |
210 | { | |
211 | if (statement->header.type == lang_input_section_enum) | |
212 | { | |
213 | asection *i = statement->input_section.section; | |
214 | ||
215 | if (!((lang_input_statement_type *) i->owner->usrdata)->flags.just_syms | |
216 | && (i->flags & SEC_EXCLUDE) == 0 | |
217 | && i->output_section != NULL | |
218 | && i->output_section->owner == link_info.output_bfd) | |
4390599b | 219 | elf${ELFSIZE}_aarch64_next_input_section (& link_info, i); |
a06ea964 NC |
220 | } |
221 | } | |
222 | ||
223 | static void | |
224 | gld${EMULATION_NAME}_after_allocation (void) | |
225 | { | |
75938853 AM |
226 | int ret; |
227 | ||
a06ea964 NC |
228 | /* bfd_elf32_discard_info just plays with debugging sections, |
229 | ie. doesn't affect any code, so we can delay resizing the | |
230 | sections. It's likely we'll resize everything in the process of | |
231 | adding stubs. */ | |
75938853 AM |
232 | ret = bfd_elf_discard_info (link_info.output_bfd, & link_info); |
233 | if (ret < 0) | |
234 | { | |
d003af55 | 235 | einfo (_("%X%P: .eh_frame/.stab edit: %E\n")); |
75938853 AM |
236 | return; |
237 | } | |
238 | else if (ret > 0) | |
a06ea964 NC |
239 | need_laying_out = 1; |
240 | ||
241 | /* If generating a relocatable output file, then we don't | |
242 | have to examine the relocs. */ | |
0e1862bb | 243 | if (stub_file != NULL && !bfd_link_relocatable (&link_info)) |
a06ea964 | 244 | { |
75938853 AM |
245 | ret = elf${ELFSIZE}_aarch64_setup_section_lists (link_info.output_bfd, |
246 | &link_info); | |
a06ea964 NC |
247 | if (ret != 0) |
248 | { | |
249 | if (ret < 0) | |
250 | { | |
d003af55 AM |
251 | einfo (_("%X%P: could not compute sections lists " |
252 | "for stub generation: %E\n")); | |
a06ea964 NC |
253 | return; |
254 | } | |
255 | ||
256 | lang_for_each_statement (build_section_lists); | |
257 | ||
258 | /* Call into the BFD backend to do the real work. */ | |
4390599b | 259 | if (! elf${ELFSIZE}_aarch64_size_stubs (link_info.output_bfd, |
a06ea964 NC |
260 | stub_file->the_bfd, |
261 | & link_info, | |
262 | group_size, | |
4390599b | 263 | & elf${ELFSIZE}_aarch64_add_stub_section, |
a06ea964 NC |
264 | & gldaarch64_layout_sections_again)) |
265 | { | |
d003af55 | 266 | einfo (_("%X%P: cannot size stub section: %E\n")); |
a06ea964 NC |
267 | return; |
268 | } | |
269 | } | |
270 | } | |
271 | ||
272 | if (need_laying_out != -1) | |
273 | gld${EMULATION_NAME}_map_segments (need_laying_out); | |
274 | } | |
275 | ||
276 | static void | |
277 | gld${EMULATION_NAME}_finish (void) | |
278 | { | |
0e1862bb | 279 | if (!bfd_link_relocatable (&link_info)) |
a06ea964 NC |
280 | { |
281 | /* Now build the linker stubs. */ | |
282 | if (stub_file->the_bfd->sections != NULL) | |
283 | { | |
4390599b | 284 | if (! elf${ELFSIZE}_aarch64_build_stubs (& link_info)) |
d003af55 | 285 | einfo (_("%X%P: can not build stubs: %E\n")); |
a06ea964 NC |
286 | } |
287 | } | |
288 | ||
289 | finish_default (); | |
290 | } | |
291 | ||
292 | /* This is a convenient point to tell BFD about target specific flags. | |
293 | After the output has been created, but before inputs are read. */ | |
294 | static void | |
295 | aarch64_elf_create_output_section_statements (void) | |
296 | { | |
297 | if (strstr (bfd_get_target (link_info.output_bfd), "aarch64") == NULL) | |
298 | { | |
299 | /* The arm backend needs special fields in the output hash structure. | |
300 | These will only be created if the output format is an arm format, | |
301 | hence we do not support linking and changing output formats at the | |
302 | same time. Use a link followed by objcopy to change output formats. */ | |
d003af55 AM |
303 | einfo (_("%F%X%P: error: Cannot change output format " |
304 | "whilst linking AArch64 binaries.\n")); | |
a06ea964 NC |
305 | return; |
306 | } | |
307 | ||
4390599b | 308 | bfd_elf${ELFSIZE}_aarch64_set_options (link_info.output_bfd, &link_info, |
a06ea964 NC |
309 | no_enum_size_warning, |
310 | no_wchar_size_warning, | |
4106101c | 311 | pic_veneer, |
1f56df9d JW |
312 | fix_erratum_835769, fix_erratum_843419, |
313 | no_apply_dynamic_relocs); | |
a06ea964 NC |
314 | |
315 | stub_file = lang_add_input_file ("linker stubs", | |
316 | lang_input_file_is_fake_enum, | |
317 | NULL); | |
318 | stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd); | |
319 | if (stub_file->the_bfd == NULL | |
320 | || ! bfd_set_arch_mach (stub_file->the_bfd, | |
321 | bfd_get_arch (link_info.output_bfd), | |
322 | bfd_get_mach (link_info.output_bfd))) | |
323 | { | |
d003af55 | 324 | einfo (_("%X%P: can not create BFD %E\n")); |
a06ea964 NC |
325 | return; |
326 | } | |
327 | ||
328 | stub_file->the_bfd->flags |= BFD_LINKER_CREATED; | |
329 | ldlang_add_file (stub_file); | |
330 | } | |
331 | ||
332 | /* Avoid processing the fake stub_file in vercheck, stat_needed and | |
333 | check_needed routines. */ | |
334 | ||
335 | static void (*real_func) (lang_input_statement_type *); | |
336 | ||
337 | static void aarch64_for_each_input_file_wrapper (lang_input_statement_type *l) | |
338 | { | |
339 | if (l != stub_file) | |
340 | (*real_func) (l); | |
341 | } | |
342 | ||
343 | static void | |
344 | aarch64_lang_for_each_input_file (void (*func) (lang_input_statement_type *)) | |
345 | { | |
346 | real_func = func; | |
347 | lang_for_each_input_file (&aarch64_for_each_input_file_wrapper); | |
348 | } | |
349 | ||
350 | #define lang_for_each_input_file aarch64_lang_for_each_input_file | |
351 | ||
352 | EOF | |
353 | ||
354 | # Define some shell vars to insert bits of code into the standard elf | |
355 | # parse_args and list_options functions. | |
356 | # | |
357 | PARSE_AND_LIST_PROLOGUE=' | |
358 | #define OPTION_NO_ENUM_SIZE_WARNING 309 | |
359 | #define OPTION_PIC_VENEER 310 | |
360 | #define OPTION_STUBGROUP_SIZE 311 | |
361 | #define OPTION_NO_WCHAR_SIZE_WARNING 312 | |
68fcca92 | 362 | #define OPTION_FIX_ERRATUM_835769 313 |
4106101c | 363 | #define OPTION_FIX_ERRATUM_843419 314 |
1f56df9d | 364 | #define OPTION_NO_APPLY_DYNAMIC_RELOCS 315 |
a06ea964 NC |
365 | ' |
366 | ||
367 | PARSE_AND_LIST_SHORTOPTS=p | |
368 | ||
369 | PARSE_AND_LIST_LONGOPTS=' | |
370 | { "no-pipeline-knowledge", no_argument, NULL, '\'p\''}, | |
371 | { "no-enum-size-warning", no_argument, NULL, OPTION_NO_ENUM_SIZE_WARNING}, | |
372 | { "pic-veneer", no_argument, NULL, OPTION_PIC_VENEER}, | |
373 | { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE }, | |
374 | { "no-wchar-size-warning", no_argument, NULL, OPTION_NO_WCHAR_SIZE_WARNING}, | |
68fcca92 | 375 | { "fix-cortex-a53-835769", no_argument, NULL, OPTION_FIX_ERRATUM_835769}, |
4106101c | 376 | { "fix-cortex-a53-843419", no_argument, NULL, OPTION_FIX_ERRATUM_843419}, |
1f56df9d | 377 | { "no-apply-dynamic-relocs", no_argument, NULL, OPTION_NO_APPLY_DYNAMIC_RELOCS}, |
a06ea964 NC |
378 | ' |
379 | ||
380 | PARSE_AND_LIST_OPTIONS=' | |
381 | fprintf (file, _(" --no-enum-size-warning Don'\''t warn about objects with incompatible\n" | |
382 | " enum sizes\n")); | |
383 | fprintf (file, _(" --no-wchar-size-warning Don'\''t warn about objects with incompatible" | |
384 | " wchar_t sizes\n")); | |
385 | fprintf (file, _(" --pic-veneer Always generate PIC interworking veneers\n")); | |
386 | fprintf (file, _("\ | |
387 | --stub-group-size=N Maximum size of a group of input sections that can be\n\ | |
388 | handled by one stub section. A negative value\n\ | |
389 | locates all stubs after their branches (with a\n\ | |
390 | group size of -N), while a positive value allows\n\ | |
391 | two groups of input sections, one before, and one\n\ | |
392 | after each stub section. Values of +/-1 indicate\n\ | |
393 | the linker should choose suitable defaults.\n" | |
394 | )); | |
68fcca92 | 395 | fprintf (file, _(" --fix-cortex-a53-835769 Fix erratum 835769\n")); |
4106101c | 396 | fprintf (file, _(" --fix-cortex-a53-843419 Fix erratum 843419\n")); |
1f56df9d | 397 | fprintf (file, _(" --no-apply-dynamic-relocs Do not apply link-time values for dynamic relocations\n")); |
a06ea964 NC |
398 | ' |
399 | ||
400 | PARSE_AND_LIST_ARGS_CASES=' | |
401 | case '\'p\'': | |
402 | /* Only here for backwards compatibility. */ | |
403 | break; | |
404 | ||
405 | case OPTION_NO_ENUM_SIZE_WARNING: | |
406 | no_enum_size_warning = 1; | |
407 | break; | |
408 | ||
409 | case OPTION_NO_WCHAR_SIZE_WARNING: | |
410 | no_wchar_size_warning = 1; | |
411 | break; | |
412 | ||
413 | case OPTION_PIC_VENEER: | |
414 | pic_veneer = 1; | |
415 | break; | |
416 | ||
68fcca92 JW |
417 | case OPTION_FIX_ERRATUM_835769: |
418 | fix_erratum_835769 = 1; | |
419 | break; | |
420 | ||
4106101c MS |
421 | case OPTION_FIX_ERRATUM_843419: |
422 | fix_erratum_843419 = 1; | |
423 | break; | |
424 | ||
1f56df9d JW |
425 | case OPTION_NO_APPLY_DYNAMIC_RELOCS: |
426 | no_apply_dynamic_relocs = 1; | |
427 | break; | |
428 | ||
a06ea964 NC |
429 | case OPTION_STUBGROUP_SIZE: |
430 | { | |
431 | const char *end; | |
432 | ||
433 | group_size = bfd_scan_vma (optarg, &end, 0); | |
434 | if (*end) | |
435 | einfo (_("%P%F: invalid number `%s'\''\n"), optarg); | |
436 | } | |
437 | break; | |
438 | ' | |
439 | ||
440 | # We have our own before_allocation etc. functions, but they call | |
441 | # the standard routines, so give them a different name. | |
442 | LDEMUL_BEFORE_ALLOCATION=aarch64_elf_before_allocation | |
443 | LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation | |
444 | LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=aarch64_elf_create_output_section_statements | |
445 | ||
446 | # Replace the elf before_parse function with our own. | |
447 | LDEMUL_BEFORE_PARSE=gld"${EMULATION_NAME}"_before_parse | |
448 | ||
449 | # Call the extra arm-elf function | |
450 | LDEMUL_FINISH=gld${EMULATION_NAME}_finish |