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a3c62988 | 1 | # This shell script emits a C file. -*- C -*- |
b3adc24a | 2 | # Copyright (C) 2013-2020 Free Software Foundation, Inc. |
a3c62988 NC |
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 | ||
075a2b89 | 22 | # This file is sourced from elf.em, and defines extra metagelf |
a3c62988 NC |
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 | { | |
6d00b590 | 48 | extern const bfd_target metag_elf32_vec; |
a3c62988 | 49 | |
6d00b590 | 50 | if (link_info.output_bfd->xvec != &metag_elf32_vec) |
a3c62988 NC |
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 | { | |
df5f2391 | 62 | einfo (_("%F%P: can not create BFD: %E\n")); |
a3c62988 NC |
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; | |
a3c62988 NC |
157 | lang_output_section_statement_type *os; |
158 | struct hook_stub_info info; | |
159 | ||
160 | flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE | |
161 | | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP); | |
162 | stub_sec = bfd_make_section_anyway_with_flags (stub_file->the_bfd, | |
163 | stub_sec_name, flags); | |
164 | if (stub_sec == NULL) | |
165 | goto err_ret; | |
166 | ||
167 | output_section = input_section->output_section; | |
24ef1aa7 | 168 | os = lang_output_section_get (output_section); |
a3c62988 NC |
169 | |
170 | info.input_section = input_section; | |
171 | lang_list_init (&info.add); | |
172 | lang_add_section (&info.add, stub_sec, NULL, os); | |
173 | ||
174 | if (info.add.head == NULL) | |
175 | goto err_ret; | |
176 | ||
177 | if (hook_in_stub (&info, &os->children.head)) | |
178 | return stub_sec; | |
179 | ||
180 | err_ret: | |
d003af55 | 181 | einfo (_("%X%P: can not make stub section: %E\n")); |
a3c62988 NC |
182 | return NULL; |
183 | } | |
184 | ||
185 | ||
186 | /* Another call-back for elf_metag_size_stubs. */ | |
187 | ||
188 | static void | |
189 | metagelf_layout_sections_again (void) | |
190 | { | |
191 | /* If we have changed sizes of the stub sections, then we need | |
192 | to recalculate all the section offsets. This may mean we need to | |
193 | add even more stubs. */ | |
d871d478 | 194 | ldelf_map_segments (TRUE); |
a3c62988 NC |
195 | need_laying_out = -1; |
196 | } | |
197 | ||
198 | ||
199 | static void | |
200 | build_section_lists (lang_statement_union_type *statement) | |
201 | { | |
202 | if (statement->header.type == lang_input_section_enum) | |
203 | { | |
204 | asection *i = statement->input_section.section; | |
205 | ||
20855e86 | 206 | if (i->sec_info_type != SEC_INFO_TYPE_JUST_SYMS |
a3c62988 NC |
207 | && (i->flags & SEC_EXCLUDE) == 0 |
208 | && i->output_section != NULL | |
209 | && i->output_section->owner == link_info.output_bfd) | |
210 | { | |
211 | elf_metag_next_input_section (&link_info, i); | |
212 | } | |
213 | } | |
214 | } | |
215 | ||
216 | ||
217 | /* For Meta we use this opportunity to build linker stubs. */ | |
218 | ||
219 | static void | |
220 | gld${EMULATION_NAME}_after_allocation (void) | |
221 | { | |
75938853 AM |
222 | int ret; |
223 | ||
a3c62988 NC |
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. */ | |
75938853 AM |
228 | ret = bfd_elf_discard_info (link_info.output_bfd, &link_info); |
229 | if (ret < 0) | |
230 | { | |
d003af55 | 231 | einfo (_("%X%P: .eh_frame/.stab edit: %E\n")); |
75938853 AM |
232 | return; |
233 | } | |
234 | else if (ret > 0) | |
a3c62988 NC |
235 | need_laying_out = 1; |
236 | ||
237 | /* If generating a relocatable output file, then we don't | |
238 | have to examine the relocs. */ | |
0e1862bb | 239 | if (stub_file != NULL && !bfd_link_relocatable (&link_info)) |
a3c62988 | 240 | { |
75938853 | 241 | ret = elf_metag_setup_section_lists (link_info.output_bfd, &link_info); |
a3c62988 NC |
242 | if (ret != 0) |
243 | { | |
244 | if (ret < 0) | |
245 | { | |
d003af55 | 246 | einfo (_("%X%P: can not size stub section: %E\n")); |
a3c62988 NC |
247 | return; |
248 | } | |
249 | ||
250 | lang_for_each_statement (build_section_lists); | |
251 | ||
252 | /* Call into the BFD backend to do the real work. */ | |
253 | if (! elf_metag_size_stubs (link_info.output_bfd, | |
254 | stub_file->the_bfd, | |
255 | &link_info, | |
256 | group_size, | |
257 | &metagelf_add_stub_section, | |
258 | &metagelf_layout_sections_again)) | |
259 | { | |
d003af55 | 260 | einfo (_("%X%P: can not size stub section: %E\n")); |
a3c62988 NC |
261 | return; |
262 | } | |
263 | } | |
264 | } | |
265 | ||
266 | if (need_laying_out != -1) | |
d871d478 | 267 | ldelf_map_segments (need_laying_out); |
a3c62988 | 268 | |
0e1862bb | 269 | if (!bfd_link_relocatable (&link_info)) |
a3c62988 NC |
270 | { |
271 | /* Now build the linker stubs. */ | |
272 | if (stub_file != NULL && stub_file->the_bfd->sections != NULL) | |
273 | { | |
274 | if (! elf_metag_build_stubs (&link_info)) | |
d003af55 | 275 | einfo (_("%X%P: can not build stubs: %E\n")); |
a3c62988 NC |
276 | } |
277 | } | |
278 | } | |
279 | ||
a3c62988 NC |
280 | EOF |
281 | ||
282 | # Define some shell vars to insert bits of code into the standard elf | |
283 | # parse_args and list_options functions. | |
284 | # | |
285 | PARSE_AND_LIST_PROLOGUE=' | |
286 | #define OPTION_STUBGROUP_SIZE 301 | |
287 | ' | |
288 | ||
289 | PARSE_AND_LIST_LONGOPTS=' | |
290 | { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE }, | |
291 | ' | |
292 | ||
293 | PARSE_AND_LIST_OPTIONS=' | |
294 | fprintf (file, _("\ | |
295 | --stub-group-size=N Maximum size of a group of input sections that\n\ | |
296 | can be handled by one stub section. A negative\n\ | |
297 | value locates all stubs before their branches\n\ | |
298 | (with a group size of -N), while a positive\n\ | |
299 | value allows two groups of input sections, one\n\ | |
300 | before, and one after each stub section.\n\ | |
301 | Values of +/-1 indicate the linker should\n\ | |
302 | choose suitable defaults.\n" | |
303 | )); | |
304 | ' | |
305 | ||
306 | PARSE_AND_LIST_ARGS_CASES=' | |
307 | case OPTION_STUBGROUP_SIZE: | |
308 | { | |
309 | const char *end; | |
6c19b93b AM |
310 | group_size = bfd_scan_vma (optarg, &end, 0); |
311 | if (*end) | |
df5f2391 | 312 | einfo (_("%F%P: invalid number `%s'\''\n"), optarg); |
a3c62988 NC |
313 | } |
314 | break; | |
315 | ' | |
316 | ||
317 | # Put these extra metagelf routines in ld_${EMULATION_NAME}_emulation | |
318 | # | |
319 | LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation | |
320 | LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=metagelf_create_output_section_statements |