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1 | # This shell script emits a C file. -*- C -*- |
2 | # Copyright 2013 Free Software Foundation, Inc. | |
3 | # | |
4 | # This file is part of GNU Binutils. | |
5 | # | |
6 | # This program is free software; you can redistribute it and/or modify | |
7 | # it under the terms of the GNU General Public License as published by | |
8 | # the Free Software Foundation; either version 3 of the License, or | |
9 | # (at your option) any later version. | |
10 | # | |
11 | # This program is distributed in the hope that it will be useful, | |
12 | # but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | # GNU General Public License for more details. | |
15 | # | |
16 | # You should have received a copy of the GNU General Public License | |
17 | # along with this program; if not, write to the Free Software | |
18 | # Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
19 | # MA 02110-1301, USA. | |
20 | # | |
21 | ||
22 | # This file is sourced from elf32.em, and defines extra metagelf | |
23 | # specific routines. Taken from hppaelf.em. | |
24 | # | |
25 | fragment <<EOF | |
26 | ||
27 | #include "ldctor.h" | |
28 | #include "elf32-metag.h" | |
29 | ||
30 | ||
31 | /* Fake input file for stubs. */ | |
32 | static lang_input_statement_type *stub_file; | |
33 | ||
34 | /* Whether we need to call metag_layout_sections_again. */ | |
35 | static int need_laying_out = 0; | |
36 | ||
37 | /* Maximum size of a group of input sections that can be handled by | |
38 | one stub section. A value of +/-1 indicates the bfd back-end | |
39 | should use a suitable default size. */ | |
40 | static bfd_signed_vma group_size = 1; | |
41 | ||
42 | /* This is called before the input files are opened. We create a new | |
43 | fake input file to hold the stub sections. */ | |
44 | ||
45 | static void | |
46 | metagelf_create_output_section_statements (void) | |
47 | { | |
48 | extern const bfd_target bfd_elf32_metag_vec; | |
49 | ||
50 | if (link_info.output_bfd->xvec != &bfd_elf32_metag_vec) | |
51 | return; | |
52 | ||
53 | stub_file = lang_add_input_file ("linker stubs", | |
54 | lang_input_file_is_fake_enum, | |
55 | NULL); | |
56 | stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd); | |
57 | if (stub_file->the_bfd == NULL | |
58 | || ! bfd_set_arch_mach (stub_file->the_bfd, | |
59 | bfd_get_arch (link_info.output_bfd), | |
60 | bfd_get_mach (link_info.output_bfd))) | |
61 | { | |
62 | einfo ("%X%P: can not create BFD %E\n"); | |
63 | return; | |
64 | } | |
65 | ||
66 | stub_file->the_bfd->flags |= BFD_LINKER_CREATED; | |
67 | ldlang_add_file (stub_file); | |
68 | } | |
69 | ||
70 | ||
71 | struct hook_stub_info | |
72 | { | |
73 | lang_statement_list_type add; | |
74 | asection *input_section; | |
75 | }; | |
76 | ||
77 | /* Traverse the linker tree to find the spot where the stub goes. */ | |
78 | ||
79 | static bfd_boolean | |
80 | hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp) | |
81 | { | |
82 | lang_statement_union_type *l; | |
83 | bfd_boolean ret; | |
84 | ||
85 | for (; (l = *lp) != NULL; lp = &l->header.next) | |
86 | { | |
87 | switch (l->header.type) | |
88 | { | |
89 | case lang_constructors_statement_enum: | |
90 | ret = hook_in_stub (info, &constructor_list.head); | |
91 | if (ret) | |
92 | return ret; | |
93 | break; | |
94 | ||
95 | case lang_output_section_statement_enum: | |
96 | ret = hook_in_stub (info, | |
97 | &l->output_section_statement.children.head); | |
98 | if (ret) | |
99 | return ret; | |
100 | break; | |
101 | ||
102 | case lang_wild_statement_enum: | |
103 | ret = hook_in_stub (info, &l->wild_statement.children.head); | |
104 | if (ret) | |
105 | return ret; | |
106 | break; | |
107 | ||
108 | case lang_group_statement_enum: | |
109 | ret = hook_in_stub (info, &l->group_statement.children.head); | |
110 | if (ret) | |
111 | return ret; | |
112 | break; | |
113 | ||
114 | case lang_input_section_enum: | |
115 | if (l->input_section.section == info->input_section) | |
116 | { | |
117 | /* We've found our section. Insert the stub immediately | |
118 | before its associated input section. */ | |
119 | *lp = info->add.head; | |
120 | *(info->add.tail) = l; | |
121 | return TRUE; | |
122 | } | |
123 | break; | |
124 | ||
125 | case lang_data_statement_enum: | |
126 | case lang_reloc_statement_enum: | |
127 | case lang_object_symbols_statement_enum: | |
128 | case lang_output_statement_enum: | |
129 | case lang_target_statement_enum: | |
130 | case lang_input_statement_enum: | |
131 | case lang_assignment_statement_enum: | |
132 | case lang_padding_statement_enum: | |
133 | case lang_address_statement_enum: | |
134 | case lang_fill_statement_enum: | |
135 | break; | |
136 | ||
137 | default: | |
138 | FAIL (); | |
139 | break; | |
140 | } | |
141 | } | |
142 | return FALSE; | |
143 | } | |
144 | ||
145 | ||
146 | /* Call-back for elf_metag_size_stubs. */ | |
147 | ||
148 | /* Create a new stub section, and arrange for it to be linked | |
149 | immediately before INPUT_SECTION. */ | |
150 | ||
151 | static asection * | |
152 | metagelf_add_stub_section (const char *stub_sec_name, asection *input_section) | |
153 | { | |
154 | asection *stub_sec; | |
155 | flagword flags; | |
156 | asection *output_section; | |
157 | const char *secname; | |
158 | lang_output_section_statement_type *os; | |
159 | struct hook_stub_info info; | |
160 | ||
161 | flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE | |
162 | | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP); | |
163 | stub_sec = bfd_make_section_anyway_with_flags (stub_file->the_bfd, | |
164 | stub_sec_name, flags); | |
165 | if (stub_sec == NULL) | |
166 | goto err_ret; | |
167 | ||
168 | output_section = input_section->output_section; | |
169 | secname = bfd_get_section_name (output_section->owner, output_section); | |
170 | os = lang_output_section_find (secname); | |
171 | ||
172 | info.input_section = input_section; | |
173 | lang_list_init (&info.add); | |
174 | lang_add_section (&info.add, stub_sec, NULL, os); | |
175 | ||
176 | if (info.add.head == NULL) | |
177 | goto err_ret; | |
178 | ||
179 | if (hook_in_stub (&info, &os->children.head)) | |
180 | return stub_sec; | |
181 | ||
182 | err_ret: | |
183 | einfo ("%X%P: can not make stub section: %E\n"); | |
184 | return NULL; | |
185 | } | |
186 | ||
187 | ||
188 | /* Another call-back for elf_metag_size_stubs. */ | |
189 | ||
190 | static void | |
191 | metagelf_layout_sections_again (void) | |
192 | { | |
193 | /* If we have changed sizes of the stub sections, then we need | |
194 | to recalculate all the section offsets. This may mean we need to | |
195 | add even more stubs. */ | |
196 | gld${EMULATION_NAME}_map_segments (TRUE); | |
197 | need_laying_out = -1; | |
198 | } | |
199 | ||
200 | ||
201 | static void | |
202 | build_section_lists (lang_statement_union_type *statement) | |
203 | { | |
204 | if (statement->header.type == lang_input_section_enum) | |
205 | { | |
206 | asection *i = statement->input_section.section; | |
207 | ||
20855e86 | 208 | if (i->sec_info_type != SEC_INFO_TYPE_JUST_SYMS |
a3c62988 NC |
209 | && (i->flags & SEC_EXCLUDE) == 0 |
210 | && i->output_section != NULL | |
211 | && i->output_section->owner == link_info.output_bfd) | |
212 | { | |
213 | elf_metag_next_input_section (&link_info, i); | |
214 | } | |
215 | } | |
216 | } | |
217 | ||
218 | ||
219 | /* For Meta we use this opportunity to build linker stubs. */ | |
220 | ||
221 | static void | |
222 | gld${EMULATION_NAME}_after_allocation (void) | |
223 | { | |
224 | /* bfd_elf_discard_info just plays with data and debugging sections, | |
225 | ie. doesn't affect code size, 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 = elf_metag_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: can not size stub section: %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 (! elf_metag_size_stubs (link_info.output_bfd, | |
250 | stub_file->the_bfd, | |
251 | &link_info, | |
252 | group_size, | |
253 | &metagelf_add_stub_section, | |
254 | &metagelf_layout_sections_again)) | |
255 | { | |
256 | einfo ("%X%P: can not 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 | if (! link_info.relocatable) | |
266 | { | |
267 | /* Now build the linker stubs. */ | |
268 | if (stub_file != NULL && stub_file->the_bfd->sections != NULL) | |
269 | { | |
270 | if (! elf_metag_build_stubs (&link_info)) | |
271 | einfo ("%X%P: can not build stubs: %E\n"); | |
272 | } | |
273 | } | |
274 | } | |
275 | ||
276 | ||
277 | /* Avoid processing the fake stub_file in vercheck, stat_needed and | |
278 | check_needed routines. */ | |
279 | ||
280 | static void (*real_func) (lang_input_statement_type *); | |
281 | ||
282 | static void metag_for_each_input_file_wrapper (lang_input_statement_type *l) | |
283 | { | |
284 | if (l != stub_file) | |
285 | (*real_func) (l); | |
286 | } | |
287 | ||
288 | static void | |
289 | metag_lang_for_each_input_file (void (*func) (lang_input_statement_type *)) | |
290 | { | |
291 | real_func = func; | |
292 | lang_for_each_input_file (&metag_for_each_input_file_wrapper); | |
293 | } | |
294 | ||
295 | #define lang_for_each_input_file metag_lang_for_each_input_file | |
296 | ||
297 | EOF | |
298 | ||
299 | # Define some shell vars to insert bits of code into the standard elf | |
300 | # parse_args and list_options functions. | |
301 | # | |
302 | PARSE_AND_LIST_PROLOGUE=' | |
303 | #define OPTION_STUBGROUP_SIZE 301 | |
304 | ' | |
305 | ||
306 | PARSE_AND_LIST_LONGOPTS=' | |
307 | { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE }, | |
308 | ' | |
309 | ||
310 | PARSE_AND_LIST_OPTIONS=' | |
311 | fprintf (file, _("\ | |
312 | --stub-group-size=N Maximum size of a group of input sections that\n\ | |
313 | can be handled by one stub section. A negative\n\ | |
314 | value locates all stubs before their branches\n\ | |
315 | (with a group size of -N), while a positive\n\ | |
316 | value allows two groups of input sections, one\n\ | |
317 | before, and one after each stub section.\n\ | |
318 | Values of +/-1 indicate the linker should\n\ | |
319 | choose suitable defaults.\n" | |
320 | )); | |
321 | ' | |
322 | ||
323 | PARSE_AND_LIST_ARGS_CASES=' | |
324 | case OPTION_STUBGROUP_SIZE: | |
325 | { | |
326 | const char *end; | |
327 | group_size = bfd_scan_vma (optarg, &end, 0); | |
328 | if (*end) | |
329 | einfo (_("%P%F: invalid number `%s'\''\n"), optarg); | |
330 | } | |
331 | break; | |
332 | ' | |
333 | ||
334 | # Put these extra metagelf routines in ld_${EMULATION_NAME}_emulation | |
335 | # | |
336 | LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation | |
337 | LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=metagelf_create_output_section_statements |