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a06ea964 NC |
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`; | |
e2caaa1f | 42 | config.separate_code = `if test "x${SEPARATE_CODE}" = xyes ; then echo TRUE ; else echo FALSE ; fi`; |
a06ea964 NC |
43 | } |
44 | ||
45 | static void | |
46 | aarch64_elf_before_allocation (void) | |
47 | { | |
48 | /* We should be able to set the size of the interworking stub section. We | |
49 | can't do it until later if we have dynamic sections, though. */ | |
50 | if (! elf_hash_table (&link_info)->dynamic_sections_created) | |
51 | { | |
52 | /* Here we rummage through the found bfds to collect information. */ | |
53 | LANG_FOR_EACH_INPUT_STATEMENT (is) | |
54 | { | |
55 | /* Initialise mapping tables for code/data. */ | |
56 | bfd_elf64_aarch64_init_maps (is->the_bfd); | |
57 | } | |
58 | } | |
59 | ||
60 | /* Call the standard elf routine. */ | |
61 | gld${EMULATION_NAME}_before_allocation (); | |
62 | } | |
63 | ||
64 | /* Fake input file for stubs. */ | |
65 | static lang_input_statement_type *stub_file; | |
66 | ||
67 | /* Whether we need to call gldarm_layout_sections_again. */ | |
68 | static int need_laying_out = 0; | |
69 | ||
70 | /* Maximum size of a group of input sections that can be handled by | |
71 | one stub section. A value of +/-1 indicates the bfd back-end | |
72 | should use a suitable default size. */ | |
73 | static bfd_signed_vma group_size = 1; | |
74 | ||
75 | struct hook_stub_info | |
76 | { | |
77 | lang_statement_list_type add; | |
78 | asection *input_section; | |
79 | }; | |
80 | ||
81 | /* Traverse the linker tree to find the spot where the stub goes. */ | |
82 | ||
83 | static bfd_boolean | |
84 | hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp) | |
85 | { | |
86 | lang_statement_union_type *l; | |
87 | bfd_boolean ret; | |
88 | ||
89 | for (; (l = *lp) != NULL; lp = &l->header.next) | |
90 | { | |
91 | switch (l->header.type) | |
92 | { | |
93 | case lang_constructors_statement_enum: | |
94 | ret = hook_in_stub (info, &constructor_list.head); | |
95 | if (ret) | |
96 | return ret; | |
97 | break; | |
98 | ||
99 | case lang_output_section_statement_enum: | |
100 | ret = hook_in_stub (info, | |
101 | &l->output_section_statement.children.head); | |
102 | if (ret) | |
103 | return ret; | |
104 | break; | |
105 | ||
106 | case lang_wild_statement_enum: | |
107 | ret = hook_in_stub (info, &l->wild_statement.children.head); | |
108 | if (ret) | |
109 | return ret; | |
110 | break; | |
111 | ||
112 | case lang_group_statement_enum: | |
113 | ret = hook_in_stub (info, &l->group_statement.children.head); | |
114 | if (ret) | |
115 | return ret; | |
116 | break; | |
117 | ||
118 | case lang_input_section_enum: | |
119 | if (l->input_section.section == info->input_section) | |
120 | { | |
121 | /* We've found our section. Insert the stub immediately | |
122 | after its associated input section. */ | |
123 | *(info->add.tail) = l->header.next; | |
124 | l->header.next = info->add.head; | |
125 | return TRUE; | |
126 | } | |
127 | break; | |
128 | ||
129 | case lang_data_statement_enum: | |
130 | case lang_reloc_statement_enum: | |
131 | case lang_object_symbols_statement_enum: | |
132 | case lang_output_statement_enum: | |
133 | case lang_target_statement_enum: | |
134 | case lang_input_statement_enum: | |
135 | case lang_assignment_statement_enum: | |
136 | case lang_padding_statement_enum: | |
137 | case lang_address_statement_enum: | |
138 | case lang_fill_statement_enum: | |
139 | break; | |
140 | ||
141 | default: | |
142 | FAIL (); | |
143 | break; | |
144 | } | |
145 | } | |
146 | return FALSE; | |
147 | } | |
148 | ||
149 | ||
150 | /* Call-back for elf64_aarch64_size_stubs. */ | |
151 | ||
152 | /* Create a new stub section, and arrange for it to be linked | |
153 | immediately after INPUT_SECTION. */ | |
154 | ||
155 | static asection * | |
156 | elf64_aarch64_add_stub_section (const char *stub_sec_name, | |
157 | asection *input_section) | |
158 | { | |
159 | asection *stub_sec; | |
160 | flagword flags; | |
161 | asection *output_section; | |
162 | const char *secname; | |
163 | lang_output_section_statement_type *os; | |
164 | struct hook_stub_info info; | |
165 | ||
166 | flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE | |
167 | | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP); | |
168 | stub_sec = bfd_make_section_anyway_with_flags (stub_file->the_bfd, | |
169 | stub_sec_name, flags); | |
170 | if (stub_sec == NULL) | |
171 | goto err_ret; | |
172 | ||
173 | bfd_set_section_alignment (stub_file->the_bfd, stub_sec, 3); | |
174 | ||
175 | output_section = input_section->output_section; | |
176 | secname = bfd_get_section_name (output_section->owner, output_section); | |
177 | os = lang_output_section_find (secname); | |
178 | ||
179 | info.input_section = input_section; | |
180 | lang_list_init (&info.add); | |
181 | lang_add_section (&info.add, stub_sec, NULL, os); | |
182 | ||
183 | if (info.add.head == NULL) | |
184 | goto err_ret; | |
185 | ||
186 | if (hook_in_stub (&info, &os->children.head)) | |
187 | return stub_sec; | |
188 | ||
189 | err_ret: | |
190 | einfo ("%X%P: can not make stub section: %E\n"); | |
191 | return NULL; | |
192 | } | |
193 | ||
194 | /* Another call-back for elf_arm_size_stubs. */ | |
195 | ||
196 | static void | |
197 | gldaarch64_layout_sections_again (void) | |
198 | { | |
199 | /* If we have changed sizes of the stub sections, then we need | |
200 | to recalculate all the section offsets. This may mean we need to | |
201 | add even more stubs. */ | |
202 | gld${EMULATION_NAME}_map_segments (TRUE); | |
203 | need_laying_out = -1; | |
204 | } | |
205 | ||
206 | static void | |
207 | build_section_lists (lang_statement_union_type *statement) | |
208 | { | |
209 | if (statement->header.type == lang_input_section_enum) | |
210 | { | |
211 | asection *i = statement->input_section.section; | |
212 | ||
213 | if (!((lang_input_statement_type *) i->owner->usrdata)->flags.just_syms | |
214 | && (i->flags & SEC_EXCLUDE) == 0 | |
215 | && i->output_section != NULL | |
216 | && i->output_section->owner == link_info.output_bfd) | |
217 | elf64_aarch64_next_input_section (& link_info, i); | |
218 | } | |
219 | } | |
220 | ||
221 | static void | |
222 | gld${EMULATION_NAME}_after_allocation (void) | |
223 | { | |
224 | /* bfd_elf32_discard_info just plays with debugging sections, | |
225 | ie. doesn't affect any code, so we can delay resizing the | |
226 | sections. It's likely we'll resize everything in the process of | |
227 | adding stubs. */ | |
228 | if (bfd_elf_discard_info (link_info.output_bfd, & link_info)) | |
229 | need_laying_out = 1; | |
230 | ||
231 | /* If generating a relocatable output file, then we don't | |
232 | have to examine the relocs. */ | |
233 | if (stub_file != NULL && !link_info.relocatable) | |
234 | { | |
235 | int ret = elf64_aarch64_setup_section_lists (link_info.output_bfd, | |
236 | & link_info); | |
237 | ||
238 | if (ret != 0) | |
239 | { | |
240 | if (ret < 0) | |
241 | { | |
242 | einfo ("%X%P: could not compute sections lists for stub generation: %E\n"); | |
243 | return; | |
244 | } | |
245 | ||
246 | lang_for_each_statement (build_section_lists); | |
247 | ||
248 | /* Call into the BFD backend to do the real work. */ | |
249 | if (! elf64_aarch64_size_stubs (link_info.output_bfd, | |
250 | stub_file->the_bfd, | |
251 | & link_info, | |
252 | group_size, | |
253 | & elf64_aarch64_add_stub_section, | |
254 | & gldaarch64_layout_sections_again)) | |
255 | { | |
256 | einfo ("%X%P: cannot size stub section: %E\n"); | |
257 | return; | |
258 | } | |
259 | } | |
260 | } | |
261 | ||
262 | if (need_laying_out != -1) | |
263 | gld${EMULATION_NAME}_map_segments (need_laying_out); | |
264 | } | |
265 | ||
266 | static void | |
267 | gld${EMULATION_NAME}_finish (void) | |
268 | { | |
269 | if (! link_info.relocatable) | |
270 | { | |
271 | /* Now build the linker stubs. */ | |
272 | if (stub_file->the_bfd->sections != NULL) | |
273 | { | |
274 | if (! elf64_aarch64_build_stubs (& link_info)) | |
275 | einfo ("%X%P: can not build stubs: %E\n"); | |
276 | } | |
277 | } | |
278 | ||
279 | finish_default (); | |
280 | } | |
281 | ||
282 | /* This is a convenient point to tell BFD about target specific flags. | |
283 | After the output has been created, but before inputs are read. */ | |
284 | static void | |
285 | aarch64_elf_create_output_section_statements (void) | |
286 | { | |
287 | if (strstr (bfd_get_target (link_info.output_bfd), "aarch64") == NULL) | |
288 | { | |
289 | /* The arm backend needs special fields in the output hash structure. | |
290 | These will only be created if the output format is an arm format, | |
291 | hence we do not support linking and changing output formats at the | |
292 | same time. Use a link followed by objcopy to change output formats. */ | |
293 | einfo ("%F%X%P: error: Cannot change output format whilst linking AArch64 binaries.\n"); | |
294 | return; | |
295 | } | |
296 | ||
297 | bfd_elf64_aarch64_set_options (link_info.output_bfd, &link_info, | |
298 | no_enum_size_warning, | |
299 | no_wchar_size_warning, | |
300 | pic_veneer); | |
301 | ||
302 | stub_file = lang_add_input_file ("linker stubs", | |
303 | lang_input_file_is_fake_enum, | |
304 | NULL); | |
305 | stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd); | |
306 | if (stub_file->the_bfd == NULL | |
307 | || ! bfd_set_arch_mach (stub_file->the_bfd, | |
308 | bfd_get_arch (link_info.output_bfd), | |
309 | bfd_get_mach (link_info.output_bfd))) | |
310 | { | |
311 | einfo ("%X%P: can not create BFD %E\n"); | |
312 | return; | |
313 | } | |
314 | ||
315 | stub_file->the_bfd->flags |= BFD_LINKER_CREATED; | |
316 | ldlang_add_file (stub_file); | |
317 | } | |
318 | ||
319 | /* Avoid processing the fake stub_file in vercheck, stat_needed and | |
320 | check_needed routines. */ | |
321 | ||
322 | static void (*real_func) (lang_input_statement_type *); | |
323 | ||
324 | static void aarch64_for_each_input_file_wrapper (lang_input_statement_type *l) | |
325 | { | |
326 | if (l != stub_file) | |
327 | (*real_func) (l); | |
328 | } | |
329 | ||
330 | static void | |
331 | aarch64_lang_for_each_input_file (void (*func) (lang_input_statement_type *)) | |
332 | { | |
333 | real_func = func; | |
334 | lang_for_each_input_file (&aarch64_for_each_input_file_wrapper); | |
335 | } | |
336 | ||
337 | #define lang_for_each_input_file aarch64_lang_for_each_input_file | |
338 | ||
339 | EOF | |
340 | ||
341 | # Define some shell vars to insert bits of code into the standard elf | |
342 | # parse_args and list_options functions. | |
343 | # | |
344 | PARSE_AND_LIST_PROLOGUE=' | |
345 | #define OPTION_NO_ENUM_SIZE_WARNING 309 | |
346 | #define OPTION_PIC_VENEER 310 | |
347 | #define OPTION_STUBGROUP_SIZE 311 | |
348 | #define OPTION_NO_WCHAR_SIZE_WARNING 312 | |
349 | ' | |
350 | ||
351 | PARSE_AND_LIST_SHORTOPTS=p | |
352 | ||
353 | PARSE_AND_LIST_LONGOPTS=' | |
354 | { "no-pipeline-knowledge", no_argument, NULL, '\'p\''}, | |
355 | { "no-enum-size-warning", no_argument, NULL, OPTION_NO_ENUM_SIZE_WARNING}, | |
356 | { "pic-veneer", no_argument, NULL, OPTION_PIC_VENEER}, | |
357 | { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE }, | |
358 | { "no-wchar-size-warning", no_argument, NULL, OPTION_NO_WCHAR_SIZE_WARNING}, | |
359 | ' | |
360 | ||
361 | PARSE_AND_LIST_OPTIONS=' | |
362 | fprintf (file, _(" --no-enum-size-warning Don'\''t warn about objects with incompatible\n" | |
363 | " enum sizes\n")); | |
364 | fprintf (file, _(" --no-wchar-size-warning Don'\''t warn about objects with incompatible" | |
365 | " wchar_t sizes\n")); | |
366 | fprintf (file, _(" --pic-veneer Always generate PIC interworking veneers\n")); | |
367 | fprintf (file, _("\ | |
368 | --stub-group-size=N Maximum size of a group of input sections that can be\n\ | |
369 | handled by one stub section. A negative value\n\ | |
370 | locates all stubs after their branches (with a\n\ | |
371 | group size of -N), while a positive value allows\n\ | |
372 | two groups of input sections, one before, and one\n\ | |
373 | after each stub section. Values of +/-1 indicate\n\ | |
374 | the linker should choose suitable defaults.\n" | |
375 | )); | |
376 | ' | |
377 | ||
378 | PARSE_AND_LIST_ARGS_CASES=' | |
379 | case '\'p\'': | |
380 | /* Only here for backwards compatibility. */ | |
381 | break; | |
382 | ||
383 | case OPTION_NO_ENUM_SIZE_WARNING: | |
384 | no_enum_size_warning = 1; | |
385 | break; | |
386 | ||
387 | case OPTION_NO_WCHAR_SIZE_WARNING: | |
388 | no_wchar_size_warning = 1; | |
389 | break; | |
390 | ||
391 | case OPTION_PIC_VENEER: | |
392 | pic_veneer = 1; | |
393 | break; | |
394 | ||
395 | case OPTION_STUBGROUP_SIZE: | |
396 | { | |
397 | const char *end; | |
398 | ||
399 | group_size = bfd_scan_vma (optarg, &end, 0); | |
400 | if (*end) | |
401 | einfo (_("%P%F: invalid number `%s'\''\n"), optarg); | |
402 | } | |
403 | break; | |
404 | ' | |
405 | ||
406 | # We have our own before_allocation etc. functions, but they call | |
407 | # the standard routines, so give them a different name. | |
408 | LDEMUL_BEFORE_ALLOCATION=aarch64_elf_before_allocation | |
409 | LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation | |
410 | LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=aarch64_elf_create_output_section_statements | |
411 | ||
412 | # Replace the elf before_parse function with our own. | |
413 | LDEMUL_BEFORE_PARSE=gld"${EMULATION_NAME}"_before_parse | |
414 | ||
415 | # Call the extra arm-elf function | |
416 | LDEMUL_FINISH=gld${EMULATION_NAME}_finish |