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a06ea964 | 1 | # This shell script emits a C file. -*- C -*- |
6f2750fe | 2 | # Copyright (C) 2009-2016 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${SEPARATE_CODE}" = xyes ; then echo TRUE ; else echo FALSE ; fi`; |
a06ea964 NC |
46 | } |
47 | ||
48 | static void | |
49 | aarch64_elf_before_allocation (void) | |
50 | { | |
51 | /* We should be able to set the size of the interworking stub section. We | |
52 | can't do it until later if we have dynamic sections, though. */ | |
53 | if (! elf_hash_table (&link_info)->dynamic_sections_created) | |
54 | { | |
55 | /* Here we rummage through the found bfds to collect information. */ | |
56 | LANG_FOR_EACH_INPUT_STATEMENT (is) | |
57 | { | |
58 | /* Initialise mapping tables for code/data. */ | |
4390599b | 59 | bfd_elf${ELFSIZE}_aarch64_init_maps (is->the_bfd); |
a06ea964 NC |
60 | } |
61 | } | |
62 | ||
63 | /* Call the standard elf routine. */ | |
64 | gld${EMULATION_NAME}_before_allocation (); | |
65 | } | |
66 | ||
67 | /* Fake input file for stubs. */ | |
68 | static lang_input_statement_type *stub_file; | |
69 | ||
70 | /* Whether we need to call gldarm_layout_sections_again. */ | |
71 | static int need_laying_out = 0; | |
72 | ||
73 | /* Maximum size of a group of input sections that can be handled by | |
74 | one stub section. A value of +/-1 indicates the bfd back-end | |
75 | should use a suitable default size. */ | |
76 | static bfd_signed_vma group_size = 1; | |
77 | ||
78 | struct hook_stub_info | |
79 | { | |
80 | lang_statement_list_type add; | |
81 | asection *input_section; | |
82 | }; | |
83 | ||
84 | /* Traverse the linker tree to find the spot where the stub goes. */ | |
85 | ||
86 | static bfd_boolean | |
87 | hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp) | |
88 | { | |
89 | lang_statement_union_type *l; | |
90 | bfd_boolean ret; | |
91 | ||
92 | for (; (l = *lp) != NULL; lp = &l->header.next) | |
93 | { | |
94 | switch (l->header.type) | |
95 | { | |
96 | case lang_constructors_statement_enum: | |
97 | ret = hook_in_stub (info, &constructor_list.head); | |
98 | if (ret) | |
99 | return ret; | |
100 | break; | |
101 | ||
102 | case lang_output_section_statement_enum: | |
103 | ret = hook_in_stub (info, | |
104 | &l->output_section_statement.children.head); | |
105 | if (ret) | |
106 | return ret; | |
107 | break; | |
108 | ||
109 | case lang_wild_statement_enum: | |
110 | ret = hook_in_stub (info, &l->wild_statement.children.head); | |
111 | if (ret) | |
112 | return ret; | |
113 | break; | |
114 | ||
115 | case lang_group_statement_enum: | |
116 | ret = hook_in_stub (info, &l->group_statement.children.head); | |
117 | if (ret) | |
118 | return ret; | |
119 | break; | |
120 | ||
121 | case lang_input_section_enum: | |
122 | if (l->input_section.section == info->input_section) | |
123 | { | |
124 | /* We've found our section. Insert the stub immediately | |
125 | after its associated input section. */ | |
126 | *(info->add.tail) = l->header.next; | |
127 | l->header.next = info->add.head; | |
128 | return TRUE; | |
129 | } | |
130 | break; | |
131 | ||
132 | case lang_data_statement_enum: | |
133 | case lang_reloc_statement_enum: | |
134 | case lang_object_symbols_statement_enum: | |
135 | case lang_output_statement_enum: | |
136 | case lang_target_statement_enum: | |
137 | case lang_input_statement_enum: | |
138 | case lang_assignment_statement_enum: | |
139 | case lang_padding_statement_enum: | |
140 | case lang_address_statement_enum: | |
141 | case lang_fill_statement_enum: | |
142 | break; | |
143 | ||
144 | default: | |
145 | FAIL (); | |
146 | break; | |
147 | } | |
148 | } | |
149 | return FALSE; | |
150 | } | |
151 | ||
152 | ||
4390599b | 153 | /* Call-back for elf${ELFSIZE}_aarch64_size_stubs. */ |
a06ea964 NC |
154 | |
155 | /* Create a new stub section, and arrange for it to be linked | |
156 | immediately after INPUT_SECTION. */ | |
157 | ||
158 | static asection * | |
4390599b | 159 | elf${ELFSIZE}_aarch64_add_stub_section (const char *stub_sec_name, |
499c37b5 | 160 | asection *input_section) |
a06ea964 NC |
161 | { |
162 | asection *stub_sec; | |
163 | flagword flags; | |
164 | asection *output_section; | |
a06ea964 NC |
165 | lang_output_section_statement_type *os; |
166 | struct hook_stub_info info; | |
167 | ||
168 | flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE | |
169 | | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP); | |
170 | stub_sec = bfd_make_section_anyway_with_flags (stub_file->the_bfd, | |
171 | stub_sec_name, flags); | |
172 | if (stub_sec == NULL) | |
173 | goto err_ret; | |
174 | ||
d9ced15d | 175 | bfd_set_section_alignment (stub_file->the_bfd, stub_sec, 2); |
a06ea964 NC |
176 | |
177 | output_section = input_section->output_section; | |
24ef1aa7 | 178 | os = lang_output_section_get (output_section); |
a06ea964 NC |
179 | |
180 | info.input_section = input_section; | |
181 | lang_list_init (&info.add); | |
182 | lang_add_section (&info.add, stub_sec, NULL, os); | |
183 | ||
184 | if (info.add.head == NULL) | |
185 | goto err_ret; | |
186 | ||
187 | if (hook_in_stub (&info, &os->children.head)) | |
188 | return stub_sec; | |
189 | ||
190 | err_ret: | |
191 | einfo ("%X%P: can not make stub section: %E\n"); | |
192 | return NULL; | |
193 | } | |
194 | ||
4390599b | 195 | /* Another call-back for elf${ELFSIZE}_aarch64_size_stubs. */ |
a06ea964 NC |
196 | |
197 | static void | |
198 | gldaarch64_layout_sections_again (void) | |
199 | { | |
200 | /* If we have changed sizes of the stub sections, then we need | |
201 | to recalculate all the section offsets. This may mean we need to | |
202 | add even more stubs. */ | |
203 | gld${EMULATION_NAME}_map_segments (TRUE); | |
204 | need_laying_out = -1; | |
205 | } | |
206 | ||
207 | static void | |
208 | build_section_lists (lang_statement_union_type *statement) | |
209 | { | |
210 | if (statement->header.type == lang_input_section_enum) | |
211 | { | |
212 | asection *i = statement->input_section.section; | |
213 | ||
214 | if (!((lang_input_statement_type *) i->owner->usrdata)->flags.just_syms | |
215 | && (i->flags & SEC_EXCLUDE) == 0 | |
216 | && i->output_section != NULL | |
217 | && i->output_section->owner == link_info.output_bfd) | |
4390599b | 218 | elf${ELFSIZE}_aarch64_next_input_section (& link_info, i); |
a06ea964 NC |
219 | } |
220 | } | |
221 | ||
222 | static void | |
223 | gld${EMULATION_NAME}_after_allocation (void) | |
224 | { | |
75938853 AM |
225 | int ret; |
226 | ||
a06ea964 NC |
227 | /* bfd_elf32_discard_info just plays with debugging sections, |
228 | ie. doesn't affect any code, so we can delay resizing the | |
229 | sections. It's likely we'll resize everything in the process of | |
230 | adding stubs. */ | |
75938853 AM |
231 | ret = bfd_elf_discard_info (link_info.output_bfd, & link_info); |
232 | if (ret < 0) | |
233 | { | |
234 | einfo ("%X%P: .eh_frame/.stab edit: %E\n"); | |
235 | return; | |
236 | } | |
237 | else if (ret > 0) | |
a06ea964 NC |
238 | need_laying_out = 1; |
239 | ||
240 | /* If generating a relocatable output file, then we don't | |
241 | have to examine the relocs. */ | |
0e1862bb | 242 | if (stub_file != NULL && !bfd_link_relocatable (&link_info)) |
a06ea964 | 243 | { |
75938853 AM |
244 | ret = elf${ELFSIZE}_aarch64_setup_section_lists (link_info.output_bfd, |
245 | &link_info); | |
a06ea964 NC |
246 | if (ret != 0) |
247 | { | |
248 | if (ret < 0) | |
249 | { | |
250 | einfo ("%X%P: could not compute sections lists for stub generation: %E\n"); | |
251 | return; | |
252 | } | |
253 | ||
254 | lang_for_each_statement (build_section_lists); | |
255 | ||
256 | /* Call into the BFD backend to do the real work. */ | |
4390599b | 257 | if (! elf${ELFSIZE}_aarch64_size_stubs (link_info.output_bfd, |
a06ea964 NC |
258 | stub_file->the_bfd, |
259 | & link_info, | |
260 | group_size, | |
4390599b | 261 | & elf${ELFSIZE}_aarch64_add_stub_section, |
a06ea964 NC |
262 | & gldaarch64_layout_sections_again)) |
263 | { | |
264 | einfo ("%X%P: cannot size stub section: %E\n"); | |
265 | return; | |
266 | } | |
267 | } | |
268 | } | |
269 | ||
270 | if (need_laying_out != -1) | |
271 | gld${EMULATION_NAME}_map_segments (need_laying_out); | |
272 | } | |
273 | ||
274 | static void | |
275 | gld${EMULATION_NAME}_finish (void) | |
276 | { | |
0e1862bb | 277 | if (!bfd_link_relocatable (&link_info)) |
a06ea964 NC |
278 | { |
279 | /* Now build the linker stubs. */ | |
280 | if (stub_file->the_bfd->sections != NULL) | |
281 | { | |
4390599b | 282 | if (! elf${ELFSIZE}_aarch64_build_stubs (& link_info)) |
a06ea964 NC |
283 | einfo ("%X%P: can not build stubs: %E\n"); |
284 | } | |
285 | } | |
286 | ||
287 | finish_default (); | |
288 | } | |
289 | ||
290 | /* This is a convenient point to tell BFD about target specific flags. | |
291 | After the output has been created, but before inputs are read. */ | |
292 | static void | |
293 | aarch64_elf_create_output_section_statements (void) | |
294 | { | |
295 | if (strstr (bfd_get_target (link_info.output_bfd), "aarch64") == NULL) | |
296 | { | |
297 | /* The arm backend needs special fields in the output hash structure. | |
298 | These will only be created if the output format is an arm format, | |
299 | hence we do not support linking and changing output formats at the | |
300 | same time. Use a link followed by objcopy to change output formats. */ | |
301 | einfo ("%F%X%P: error: Cannot change output format whilst linking AArch64 binaries.\n"); | |
302 | return; | |
303 | } | |
304 | ||
4390599b | 305 | bfd_elf${ELFSIZE}_aarch64_set_options (link_info.output_bfd, &link_info, |
a06ea964 NC |
306 | no_enum_size_warning, |
307 | no_wchar_size_warning, | |
4106101c | 308 | pic_veneer, |
1f56df9d JW |
309 | fix_erratum_835769, fix_erratum_843419, |
310 | no_apply_dynamic_relocs); | |
a06ea964 NC |
311 | |
312 | stub_file = lang_add_input_file ("linker stubs", | |
313 | lang_input_file_is_fake_enum, | |
314 | NULL); | |
315 | stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd); | |
316 | if (stub_file->the_bfd == NULL | |
317 | || ! bfd_set_arch_mach (stub_file->the_bfd, | |
318 | bfd_get_arch (link_info.output_bfd), | |
319 | bfd_get_mach (link_info.output_bfd))) | |
320 | { | |
321 | einfo ("%X%P: can not create BFD %E\n"); | |
322 | return; | |
323 | } | |
324 | ||
325 | stub_file->the_bfd->flags |= BFD_LINKER_CREATED; | |
326 | ldlang_add_file (stub_file); | |
327 | } | |
328 | ||
329 | /* Avoid processing the fake stub_file in vercheck, stat_needed and | |
330 | check_needed routines. */ | |
331 | ||
332 | static void (*real_func) (lang_input_statement_type *); | |
333 | ||
334 | static void aarch64_for_each_input_file_wrapper (lang_input_statement_type *l) | |
335 | { | |
336 | if (l != stub_file) | |
337 | (*real_func) (l); | |
338 | } | |
339 | ||
340 | static void | |
341 | aarch64_lang_for_each_input_file (void (*func) (lang_input_statement_type *)) | |
342 | { | |
343 | real_func = func; | |
344 | lang_for_each_input_file (&aarch64_for_each_input_file_wrapper); | |
345 | } | |
346 | ||
347 | #define lang_for_each_input_file aarch64_lang_for_each_input_file | |
348 | ||
349 | EOF | |
350 | ||
351 | # Define some shell vars to insert bits of code into the standard elf | |
352 | # parse_args and list_options functions. | |
353 | # | |
354 | PARSE_AND_LIST_PROLOGUE=' | |
355 | #define OPTION_NO_ENUM_SIZE_WARNING 309 | |
356 | #define OPTION_PIC_VENEER 310 | |
357 | #define OPTION_STUBGROUP_SIZE 311 | |
358 | #define OPTION_NO_WCHAR_SIZE_WARNING 312 | |
68fcca92 | 359 | #define OPTION_FIX_ERRATUM_835769 313 |
4106101c | 360 | #define OPTION_FIX_ERRATUM_843419 314 |
1f56df9d | 361 | #define OPTION_NO_APPLY_DYNAMIC_RELOCS 315 |
a06ea964 NC |
362 | ' |
363 | ||
364 | PARSE_AND_LIST_SHORTOPTS=p | |
365 | ||
366 | PARSE_AND_LIST_LONGOPTS=' | |
367 | { "no-pipeline-knowledge", no_argument, NULL, '\'p\''}, | |
368 | { "no-enum-size-warning", no_argument, NULL, OPTION_NO_ENUM_SIZE_WARNING}, | |
369 | { "pic-veneer", no_argument, NULL, OPTION_PIC_VENEER}, | |
370 | { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE }, | |
371 | { "no-wchar-size-warning", no_argument, NULL, OPTION_NO_WCHAR_SIZE_WARNING}, | |
68fcca92 | 372 | { "fix-cortex-a53-835769", no_argument, NULL, OPTION_FIX_ERRATUM_835769}, |
4106101c | 373 | { "fix-cortex-a53-843419", no_argument, NULL, OPTION_FIX_ERRATUM_843419}, |
1f56df9d | 374 | { "no-apply-dynamic-relocs", no_argument, NULL, OPTION_NO_APPLY_DYNAMIC_RELOCS}, |
a06ea964 NC |
375 | ' |
376 | ||
377 | PARSE_AND_LIST_OPTIONS=' | |
378 | fprintf (file, _(" --no-enum-size-warning Don'\''t warn about objects with incompatible\n" | |
379 | " enum sizes\n")); | |
380 | fprintf (file, _(" --no-wchar-size-warning Don'\''t warn about objects with incompatible" | |
381 | " wchar_t sizes\n")); | |
382 | fprintf (file, _(" --pic-veneer Always generate PIC interworking veneers\n")); | |
383 | fprintf (file, _("\ | |
384 | --stub-group-size=N Maximum size of a group of input sections that can be\n\ | |
385 | handled by one stub section. A negative value\n\ | |
386 | locates all stubs after their branches (with a\n\ | |
387 | group size of -N), while a positive value allows\n\ | |
388 | two groups of input sections, one before, and one\n\ | |
389 | after each stub section. Values of +/-1 indicate\n\ | |
390 | the linker should choose suitable defaults.\n" | |
391 | )); | |
68fcca92 | 392 | fprintf (file, _(" --fix-cortex-a53-835769 Fix erratum 835769\n")); |
4106101c | 393 | fprintf (file, _(" --fix-cortex-a53-843419 Fix erratum 843419\n")); |
1f56df9d | 394 | fprintf (file, _(" --no-apply-dynamic-relocs Do not apply link-time values for dynamic relocations\n")); |
a06ea964 NC |
395 | ' |
396 | ||
397 | PARSE_AND_LIST_ARGS_CASES=' | |
398 | case '\'p\'': | |
399 | /* Only here for backwards compatibility. */ | |
400 | break; | |
401 | ||
402 | case OPTION_NO_ENUM_SIZE_WARNING: | |
403 | no_enum_size_warning = 1; | |
404 | break; | |
405 | ||
406 | case OPTION_NO_WCHAR_SIZE_WARNING: | |
407 | no_wchar_size_warning = 1; | |
408 | break; | |
409 | ||
410 | case OPTION_PIC_VENEER: | |
411 | pic_veneer = 1; | |
412 | break; | |
413 | ||
68fcca92 JW |
414 | case OPTION_FIX_ERRATUM_835769: |
415 | fix_erratum_835769 = 1; | |
416 | break; | |
417 | ||
4106101c MS |
418 | case OPTION_FIX_ERRATUM_843419: |
419 | fix_erratum_843419 = 1; | |
420 | break; | |
421 | ||
1f56df9d JW |
422 | case OPTION_NO_APPLY_DYNAMIC_RELOCS: |
423 | no_apply_dynamic_relocs = 1; | |
424 | break; | |
425 | ||
a06ea964 NC |
426 | case OPTION_STUBGROUP_SIZE: |
427 | { | |
428 | const char *end; | |
429 | ||
430 | group_size = bfd_scan_vma (optarg, &end, 0); | |
431 | if (*end) | |
432 | einfo (_("%P%F: invalid number `%s'\''\n"), optarg); | |
433 | } | |
434 | break; | |
435 | ' | |
436 | ||
437 | # We have our own before_allocation etc. functions, but they call | |
438 | # the standard routines, so give them a different name. | |
439 | LDEMUL_BEFORE_ALLOCATION=aarch64_elf_before_allocation | |
440 | LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation | |
441 | LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=aarch64_elf_create_output_section_statements | |
442 | ||
443 | # Replace the elf before_parse function with our own. | |
444 | LDEMUL_BEFORE_PARSE=gld"${EMULATION_NAME}"_before_parse | |
445 | ||
446 | # Call the extra arm-elf function | |
447 | LDEMUL_FINISH=gld${EMULATION_NAME}_finish |