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1 | # This shell script emits a C file. -*- C -*- |
2 | # Copyright 2009-2012 Free Software Foundation, Inc. | |
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; | |
33 | ||
34 | static void | |
35 | gld${EMULATION_NAME}_before_parse (void) | |
36 | { | |
37 | #ifndef TARGET_ /* I.e., if not generic. */ | |
38 | ldfile_set_output_arch ("`echo ${ARCH}`", bfd_arch_unknown); | |
39 | #endif /* not TARGET_ */ | |
40 | input_flags.dynamic = ${DYNAMIC_LINK-TRUE}; | |
41 | config.has_shared = `if test -n "$GENERATE_SHLIB_SCRIPT" ; then echo TRUE ; else echo FALSE ; fi`; | |
42 | } | |
43 | ||
44 | static void | |
45 | aarch64_elf_before_allocation (void) | |
46 | { | |
47 | /* We should be able to set the size of the interworking stub section. We | |
48 | can't do it until later if we have dynamic sections, though. */ | |
49 | if (! elf_hash_table (&link_info)->dynamic_sections_created) | |
50 | { | |
51 | /* Here we rummage through the found bfds to collect information. */ | |
52 | LANG_FOR_EACH_INPUT_STATEMENT (is) | |
53 | { | |
54 | /* Initialise mapping tables for code/data. */ | |
55 | bfd_elf64_aarch64_init_maps (is->the_bfd); | |
56 | } | |
57 | } | |
58 | ||
59 | /* Call the standard elf routine. */ | |
60 | gld${EMULATION_NAME}_before_allocation (); | |
61 | } | |
62 | ||
63 | /* Fake input file for stubs. */ | |
64 | static lang_input_statement_type *stub_file; | |
65 | ||
66 | /* Whether we need to call gldarm_layout_sections_again. */ | |
67 | static int need_laying_out = 0; | |
68 | ||
69 | /* Maximum size of a group of input sections that can be handled by | |
70 | one stub section. A value of +/-1 indicates the bfd back-end | |
71 | should use a suitable default size. */ | |
72 | static bfd_signed_vma group_size = 1; | |
73 | ||
74 | struct hook_stub_info | |
75 | { | |
76 | lang_statement_list_type add; | |
77 | asection *input_section; | |
78 | }; | |
79 | ||
80 | /* Traverse the linker tree to find the spot where the stub goes. */ | |
81 | ||
82 | static bfd_boolean | |
83 | hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp) | |
84 | { | |
85 | lang_statement_union_type *l; | |
86 | bfd_boolean ret; | |
87 | ||
88 | for (; (l = *lp) != NULL; lp = &l->header.next) | |
89 | { | |
90 | switch (l->header.type) | |
91 | { | |
92 | case lang_constructors_statement_enum: | |
93 | ret = hook_in_stub (info, &constructor_list.head); | |
94 | if (ret) | |
95 | return ret; | |
96 | break; | |
97 | ||
98 | case lang_output_section_statement_enum: | |
99 | ret = hook_in_stub (info, | |
100 | &l->output_section_statement.children.head); | |
101 | if (ret) | |
102 | return ret; | |
103 | break; | |
104 | ||
105 | case lang_wild_statement_enum: | |
106 | ret = hook_in_stub (info, &l->wild_statement.children.head); | |
107 | if (ret) | |
108 | return ret; | |
109 | break; | |
110 | ||
111 | case lang_group_statement_enum: | |
112 | ret = hook_in_stub (info, &l->group_statement.children.head); | |
113 | if (ret) | |
114 | return ret; | |
115 | break; | |
116 | ||
117 | case lang_input_section_enum: | |
118 | if (l->input_section.section == info->input_section) | |
119 | { | |
120 | /* We've found our section. Insert the stub immediately | |
121 | after its associated input section. */ | |
122 | *(info->add.tail) = l->header.next; | |
123 | l->header.next = info->add.head; | |
124 | return TRUE; | |
125 | } | |
126 | break; | |
127 | ||
128 | case lang_data_statement_enum: | |
129 | case lang_reloc_statement_enum: | |
130 | case lang_object_symbols_statement_enum: | |
131 | case lang_output_statement_enum: | |
132 | case lang_target_statement_enum: | |
133 | case lang_input_statement_enum: | |
134 | case lang_assignment_statement_enum: | |
135 | case lang_padding_statement_enum: | |
136 | case lang_address_statement_enum: | |
137 | case lang_fill_statement_enum: | |
138 | break; | |
139 | ||
140 | default: | |
141 | FAIL (); | |
142 | break; | |
143 | } | |
144 | } | |
145 | return FALSE; | |
146 | } | |
147 | ||
148 | ||
149 | /* Call-back for elf64_aarch64_size_stubs. */ | |
150 | ||
151 | /* Create a new stub section, and arrange for it to be linked | |
152 | immediately after INPUT_SECTION. */ | |
153 | ||
154 | static asection * | |
155 | elf64_aarch64_add_stub_section (const char *stub_sec_name, | |
156 | asection *input_section) | |
157 | { | |
158 | asection *stub_sec; | |
159 | flagword flags; | |
160 | asection *output_section; | |
161 | const char *secname; | |
162 | lang_output_section_statement_type *os; | |
163 | struct hook_stub_info info; | |
164 | ||
165 | flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE | |
166 | | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP); | |
167 | stub_sec = bfd_make_section_anyway_with_flags (stub_file->the_bfd, | |
168 | stub_sec_name, flags); | |
169 | if (stub_sec == NULL) | |
170 | goto err_ret; | |
171 | ||
172 | bfd_set_section_alignment (stub_file->the_bfd, stub_sec, 3); | |
173 | ||
174 | output_section = input_section->output_section; | |
175 | secname = bfd_get_section_name (output_section->owner, output_section); | |
176 | os = lang_output_section_find (secname); | |
177 | ||
178 | info.input_section = input_section; | |
179 | lang_list_init (&info.add); | |
180 | lang_add_section (&info.add, stub_sec, NULL, os); | |
181 | ||
182 | if (info.add.head == NULL) | |
183 | goto err_ret; | |
184 | ||
185 | if (hook_in_stub (&info, &os->children.head)) | |
186 | return stub_sec; | |
187 | ||
188 | err_ret: | |
189 | einfo ("%X%P: can not make stub section: %E\n"); | |
190 | return NULL; | |
191 | } | |
192 | ||
193 | /* Another call-back for elf_arm_size_stubs. */ | |
194 | ||
195 | static void | |
196 | gldaarch64_layout_sections_again (void) | |
197 | { | |
198 | /* If we have changed sizes of the stub sections, then we need | |
199 | to recalculate all the section offsets. This may mean we need to | |
200 | add even more stubs. */ | |
201 | gld${EMULATION_NAME}_map_segments (TRUE); | |
202 | need_laying_out = -1; | |
203 | } | |
204 | ||
205 | static void | |
206 | build_section_lists (lang_statement_union_type *statement) | |
207 | { | |
208 | if (statement->header.type == lang_input_section_enum) | |
209 | { | |
210 | asection *i = statement->input_section.section; | |
211 | ||
212 | if (!((lang_input_statement_type *) i->owner->usrdata)->flags.just_syms | |
213 | && (i->flags & SEC_EXCLUDE) == 0 | |
214 | && i->output_section != NULL | |
215 | && i->output_section->owner == link_info.output_bfd) | |
216 | elf64_aarch64_next_input_section (& link_info, i); | |
217 | } | |
218 | } | |
219 | ||
220 | static void | |
221 | gld${EMULATION_NAME}_after_allocation (void) | |
222 | { | |
223 | /* bfd_elf32_discard_info just plays with debugging sections, | |
224 | ie. doesn't affect any code, so we can delay resizing the | |
225 | sections. It's likely we'll resize everything in the process of | |
226 | adding stubs. */ | |
227 | if (bfd_elf_discard_info (link_info.output_bfd, & link_info)) | |
228 | need_laying_out = 1; | |
229 | ||
230 | /* If generating a relocatable output file, then we don't | |
231 | have to examine the relocs. */ | |
232 | if (stub_file != NULL && !link_info.relocatable) | |
233 | { | |
234 | int ret = elf64_aarch64_setup_section_lists (link_info.output_bfd, | |
235 | & link_info); | |
236 | ||
237 | if (ret != 0) | |
238 | { | |
239 | if (ret < 0) | |
240 | { | |
241 | einfo ("%X%P: could not compute sections lists for stub generation: %E\n"); | |
242 | return; | |
243 | } | |
244 | ||
245 | lang_for_each_statement (build_section_lists); | |
246 | ||
247 | /* Call into the BFD backend to do the real work. */ | |
248 | if (! elf64_aarch64_size_stubs (link_info.output_bfd, | |
249 | stub_file->the_bfd, | |
250 | & link_info, | |
251 | group_size, | |
252 | & elf64_aarch64_add_stub_section, | |
253 | & gldaarch64_layout_sections_again)) | |
254 | { | |
255 | einfo ("%X%P: cannot size stub section: %E\n"); | |
256 | return; | |
257 | } | |
258 | } | |
259 | } | |
260 | ||
261 | if (need_laying_out != -1) | |
262 | gld${EMULATION_NAME}_map_segments (need_laying_out); | |
263 | } | |
264 | ||
265 | static void | |
266 | gld${EMULATION_NAME}_finish (void) | |
267 | { | |
268 | if (! link_info.relocatable) | |
269 | { | |
270 | /* Now build the linker stubs. */ | |
271 | if (stub_file->the_bfd->sections != NULL) | |
272 | { | |
273 | if (! elf64_aarch64_build_stubs (& link_info)) | |
274 | einfo ("%X%P: can not build stubs: %E\n"); | |
275 | } | |
276 | } | |
277 | ||
278 | finish_default (); | |
279 | } | |
280 | ||
281 | /* This is a convenient point to tell BFD about target specific flags. | |
282 | After the output has been created, but before inputs are read. */ | |
283 | static void | |
284 | aarch64_elf_create_output_section_statements (void) | |
285 | { | |
286 | if (strstr (bfd_get_target (link_info.output_bfd), "aarch64") == NULL) | |
287 | { | |
288 | /* The arm backend needs special fields in the output hash structure. | |
289 | These will only be created if the output format is an arm format, | |
290 | hence we do not support linking and changing output formats at the | |
291 | same time. Use a link followed by objcopy to change output formats. */ | |
292 | einfo ("%F%X%P: error: Cannot change output format whilst linking AArch64 binaries.\n"); | |
293 | return; | |
294 | } | |
295 | ||
296 | bfd_elf64_aarch64_set_options (link_info.output_bfd, &link_info, | |
297 | no_enum_size_warning, | |
298 | no_wchar_size_warning, | |
299 | pic_veneer); | |
300 | ||
301 | stub_file = lang_add_input_file ("linker stubs", | |
302 | lang_input_file_is_fake_enum, | |
303 | NULL); | |
304 | stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd); | |
305 | if (stub_file->the_bfd == NULL | |
306 | || ! bfd_set_arch_mach (stub_file->the_bfd, | |
307 | bfd_get_arch (link_info.output_bfd), | |
308 | bfd_get_mach (link_info.output_bfd))) | |
309 | { | |
310 | einfo ("%X%P: can not create BFD %E\n"); | |
311 | return; | |
312 | } | |
313 | ||
314 | stub_file->the_bfd->flags |= BFD_LINKER_CREATED; | |
315 | ldlang_add_file (stub_file); | |
316 | } | |
317 | ||
318 | /* Avoid processing the fake stub_file in vercheck, stat_needed and | |
319 | check_needed routines. */ | |
320 | ||
321 | static void (*real_func) (lang_input_statement_type *); | |
322 | ||
323 | static void aarch64_for_each_input_file_wrapper (lang_input_statement_type *l) | |
324 | { | |
325 | if (l != stub_file) | |
326 | (*real_func) (l); | |
327 | } | |
328 | ||
329 | static void | |
330 | aarch64_lang_for_each_input_file (void (*func) (lang_input_statement_type *)) | |
331 | { | |
332 | real_func = func; | |
333 | lang_for_each_input_file (&aarch64_for_each_input_file_wrapper); | |
334 | } | |
335 | ||
336 | #define lang_for_each_input_file aarch64_lang_for_each_input_file | |
337 | ||
338 | EOF | |
339 | ||
340 | # Define some shell vars to insert bits of code into the standard elf | |
341 | # parse_args and list_options functions. | |
342 | # | |
343 | PARSE_AND_LIST_PROLOGUE=' | |
344 | #define OPTION_NO_ENUM_SIZE_WARNING 309 | |
345 | #define OPTION_PIC_VENEER 310 | |
346 | #define OPTION_STUBGROUP_SIZE 311 | |
347 | #define OPTION_NO_WCHAR_SIZE_WARNING 312 | |
348 | ' | |
349 | ||
350 | PARSE_AND_LIST_SHORTOPTS=p | |
351 | ||
352 | PARSE_AND_LIST_LONGOPTS=' | |
353 | { "no-pipeline-knowledge", no_argument, NULL, '\'p\''}, | |
354 | { "no-enum-size-warning", no_argument, NULL, OPTION_NO_ENUM_SIZE_WARNING}, | |
355 | { "pic-veneer", no_argument, NULL, OPTION_PIC_VENEER}, | |
356 | { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE }, | |
357 | { "no-wchar-size-warning", no_argument, NULL, OPTION_NO_WCHAR_SIZE_WARNING}, | |
358 | ' | |
359 | ||
360 | PARSE_AND_LIST_OPTIONS=' | |
361 | fprintf (file, _(" --no-enum-size-warning Don'\''t warn about objects with incompatible\n" | |
362 | " enum sizes\n")); | |
363 | fprintf (file, _(" --no-wchar-size-warning Don'\''t warn about objects with incompatible" | |
364 | " wchar_t sizes\n")); | |
365 | fprintf (file, _(" --pic-veneer Always generate PIC interworking veneers\n")); | |
366 | fprintf (file, _("\ | |
367 | --stub-group-size=N Maximum size of a group of input sections that can be\n\ | |
368 | handled by one stub section. A negative value\n\ | |
369 | locates all stubs after their branches (with a\n\ | |
370 | group size of -N), while a positive value allows\n\ | |
371 | two groups of input sections, one before, and one\n\ | |
372 | after each stub section. Values of +/-1 indicate\n\ | |
373 | the linker should choose suitable defaults.\n" | |
374 | )); | |
375 | ' | |
376 | ||
377 | PARSE_AND_LIST_ARGS_CASES=' | |
378 | case '\'p\'': | |
379 | /* Only here for backwards compatibility. */ | |
380 | break; | |
381 | ||
382 | case OPTION_NO_ENUM_SIZE_WARNING: | |
383 | no_enum_size_warning = 1; | |
384 | break; | |
385 | ||
386 | case OPTION_NO_WCHAR_SIZE_WARNING: | |
387 | no_wchar_size_warning = 1; | |
388 | break; | |
389 | ||
390 | case OPTION_PIC_VENEER: | |
391 | pic_veneer = 1; | |
392 | break; | |
393 | ||
394 | case OPTION_STUBGROUP_SIZE: | |
395 | { | |
396 | const char *end; | |
397 | ||
398 | group_size = bfd_scan_vma (optarg, &end, 0); | |
399 | if (*end) | |
400 | einfo (_("%P%F: invalid number `%s'\''\n"), optarg); | |
401 | } | |
402 | break; | |
403 | ' | |
404 | ||
405 | # We have our own before_allocation etc. functions, but they call | |
406 | # the standard routines, so give them a different name. | |
407 | LDEMUL_BEFORE_ALLOCATION=aarch64_elf_before_allocation | |
408 | LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation | |
409 | LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=aarch64_elf_create_output_section_statements | |
410 | ||
411 | # Replace the elf before_parse function with our own. | |
412 | LDEMUL_BEFORE_PARSE=gld"${EMULATION_NAME}"_before_parse | |
413 | ||
414 | # Call the extra arm-elf function | |
415 | LDEMUL_FINISH=gld${EMULATION_NAME}_finish |