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78058a5e | 1 | # This shell script emits a C file. -*- C -*- |
82704155 | 2 | # Copyright (C) 2013-2019 Free Software Foundation, Inc. |
78058a5e SL |
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 Nios II ELF | |
23 | # specific routines. Taken from metagelf.em. | |
24 | # | |
25 | fragment <<EOF | |
26 | ||
27 | #include "ldctor.h" | |
28 | #include "elf32-nios2.h" | |
29 | ||
30 | ||
31 | /* Fake input file for stubs. */ | |
32 | static lang_input_statement_type *stub_file; | |
33 | ||
34 | /* Whether we need to call nios2_layout_sections_again. */ | |
35 | static int need_laying_out = 0; | |
36 | ||
37 | ||
38 | /* This is called before the input files are opened. We create a new | |
39 | fake input file to hold the stub sections. */ | |
40 | ||
41 | static void | |
42 | nios2elf_create_output_section_statements (void) | |
43 | { | |
6d00b590 | 44 | extern const bfd_target nios2_elf32_le_vec, nios2_elf32_be_vec; |
78058a5e | 45 | |
6d00b590 AM |
46 | if (link_info.output_bfd->xvec != &nios2_elf32_le_vec |
47 | && link_info.output_bfd->xvec != &nios2_elf32_be_vec) | |
78058a5e SL |
48 | return; |
49 | ||
50 | /* If --no-relax was not explicitly specified by the user, enable | |
51 | relaxation. If it's not enabled (either explicitly or by default), | |
52 | we're done, as we won't need to create any stubs. */ | |
0e1862bb | 53 | if (!bfd_link_relocatable (&link_info) && RELAXATION_DISABLED_BY_DEFAULT) |
78058a5e SL |
54 | ENABLE_RELAXATION; |
55 | if (!RELAXATION_ENABLED) | |
56 | return; | |
57 | ||
58 | stub_file = lang_add_input_file ("linker stubs", | |
59 | lang_input_file_is_fake_enum, | |
60 | NULL); | |
61 | stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd); | |
62 | if (stub_file->the_bfd == NULL | |
63 | || ! bfd_set_arch_mach (stub_file->the_bfd, | |
64 | bfd_get_arch (link_info.output_bfd), | |
65 | bfd_get_mach (link_info.output_bfd))) | |
66 | { | |
df5f2391 | 67 | einfo (_("%F%P: can not create BFD: %E\n")); |
78058a5e SL |
68 | return; |
69 | } | |
70 | ||
71 | stub_file->the_bfd->flags |= BFD_LINKER_CREATED; | |
72 | ldlang_add_file (stub_file); | |
73 | } | |
74 | ||
75 | ||
76 | struct hook_stub_info | |
77 | { | |
78 | lang_statement_list_type add; | |
79 | asection *input_section; | |
80 | }; | |
81 | ||
82 | /* Traverse the linker tree to find the spot where the stub goes. */ | |
83 | ||
84 | static bfd_boolean | |
85 | hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp, | |
86 | bfd_boolean afterp) | |
87 | { | |
88 | lang_statement_union_type *l; | |
89 | bfd_boolean ret; | |
90 | ||
91 | for (; (l = *lp) != NULL; lp = &l->header.next) | |
92 | { | |
93 | switch (l->header.type) | |
94 | { | |
95 | case lang_constructors_statement_enum: | |
96 | ret = hook_in_stub (info, &constructor_list.head, afterp); | |
97 | if (ret) | |
98 | return ret; | |
99 | break; | |
100 | ||
101 | case lang_output_section_statement_enum: | |
102 | ret = hook_in_stub (info, | |
103 | &l->output_section_statement.children.head, | |
104 | afterp); | |
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, afterp); | |
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, afterp); | |
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 | before or after its associated input section. */ | |
126 | if (afterp) | |
127 | { | |
128 | *(info->add.tail) = l->header.next; | |
129 | l->header.next = info->add.head; | |
130 | } | |
131 | else | |
132 | { | |
133 | *lp = info->add.head; | |
134 | *(info->add.tail) = l; | |
135 | } | |
136 | return TRUE; | |
137 | } | |
138 | break; | |
139 | ||
140 | case lang_data_statement_enum: | |
141 | case lang_reloc_statement_enum: | |
142 | case lang_object_symbols_statement_enum: | |
143 | case lang_output_statement_enum: | |
144 | case lang_target_statement_enum: | |
145 | case lang_input_statement_enum: | |
146 | case lang_assignment_statement_enum: | |
147 | case lang_padding_statement_enum: | |
148 | case lang_address_statement_enum: | |
149 | case lang_fill_statement_enum: | |
150 | break; | |
151 | ||
152 | default: | |
153 | FAIL (); | |
154 | break; | |
155 | } | |
156 | } | |
157 | return FALSE; | |
158 | } | |
159 | ||
160 | /* Call-back for elf32_nios2_size_stubs. */ | |
161 | ||
162 | /* Create a new stub section, and arrange for it to be linked | |
163 | immediately before or after INPUT_SECTION, according to AFTERP. */ | |
164 | ||
165 | static asection * | |
166 | nios2elf_add_stub_section (const char *stub_sec_name, asection *input_section, | |
167 | bfd_boolean afterp) | |
168 | { | |
169 | asection *stub_sec; | |
170 | flagword flags; | |
171 | asection *output_section; | |
172 | const char *secname; | |
173 | lang_output_section_statement_type *os; | |
174 | struct hook_stub_info info; | |
175 | ||
176 | flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE | |
177 | | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP); | |
178 | stub_sec = bfd_make_section_anyway_with_flags (stub_file->the_bfd, | |
179 | stub_sec_name, flags); | |
180 | if (stub_sec == NULL) | |
181 | goto err_ret; | |
182 | ||
183 | output_section = input_section->output_section; | |
184 | secname = bfd_get_section_name (output_section->owner, output_section); | |
185 | os = lang_output_section_find (secname); | |
186 | ||
187 | info.input_section = input_section; | |
188 | lang_list_init (&info.add); | |
189 | lang_add_section (&info.add, stub_sec, NULL, os); | |
190 | ||
191 | if (info.add.head == NULL) | |
192 | goto err_ret; | |
193 | ||
194 | if (hook_in_stub (&info, &os->children.head, afterp)) | |
195 | return stub_sec; | |
196 | ||
197 | err_ret: | |
d003af55 | 198 | einfo (_("%X%P: can not make stub section: %E\n")); |
78058a5e SL |
199 | return NULL; |
200 | } | |
201 | ||
202 | ||
203 | /* Another call-back for elf32_nios2_size_stubs. */ | |
204 | ||
205 | static void | |
206 | nios2elf_layout_sections_again (void) | |
207 | { | |
208 | /* If we have changed sizes of the stub sections, then we need | |
209 | to recalculate all the section offsets. This may mean we need to | |
210 | add even more stubs. */ | |
211 | gld${EMULATION_NAME}_map_segments (TRUE); | |
212 | need_laying_out = -1; | |
213 | } | |
214 | ||
215 | ||
216 | static void | |
217 | build_section_lists (lang_statement_union_type *statement) | |
218 | { | |
219 | if (statement->header.type == lang_input_section_enum) | |
220 | { | |
221 | asection *i = statement->input_section.section; | |
222 | ||
223 | if (i->sec_info_type != SEC_INFO_TYPE_JUST_SYMS | |
224 | && (i->flags & SEC_EXCLUDE) == 0 | |
225 | && i->output_section != NULL | |
226 | && i->output_section->owner == link_info.output_bfd) | |
227 | { | |
228 | nios2_elf32_next_input_section (&link_info, i); | |
229 | } | |
230 | } | |
231 | } | |
232 | ||
233 | ||
234 | /* For Nios II we use this opportunity to build linker stubs. */ | |
235 | ||
236 | static void | |
237 | gld${EMULATION_NAME}_after_allocation (void) | |
238 | { | |
75938853 AM |
239 | int ret; |
240 | ||
78058a5e SL |
241 | /* bfd_elf_discard_info just plays with data and debugging sections, |
242 | ie. doesn't affect code size, so we can delay resizing the | |
243 | sections. It's likely we'll resize everything in the process of | |
244 | adding stubs. */ | |
75938853 AM |
245 | ret = bfd_elf_discard_info (link_info.output_bfd, &link_info); |
246 | if (ret < 0) | |
247 | { | |
d003af55 | 248 | einfo (_("%X%P: .eh_frame/.stab edit: %E\n")); |
75938853 AM |
249 | return; |
250 | } | |
251 | else if (ret > 0) | |
78058a5e SL |
252 | need_laying_out = 1; |
253 | ||
254 | /* If generating a relocatable output file, then we don't | |
255 | have to examine the relocs. */ | |
0e1862bb L |
256 | if (stub_file != NULL |
257 | && !bfd_link_relocatable (&link_info) | |
258 | && RELAXATION_ENABLED) | |
78058a5e | 259 | { |
75938853 | 260 | ret = nios2_elf32_setup_section_lists (link_info.output_bfd, &link_info); |
78058a5e SL |
261 | if (ret != 0) |
262 | { | |
263 | if (ret < 0) | |
264 | { | |
d003af55 | 265 | einfo (_("%X%P: can not size stub section: %E\n")); |
78058a5e SL |
266 | return; |
267 | } | |
268 | ||
269 | lang_for_each_statement (build_section_lists); | |
270 | ||
271 | /* Call into the BFD backend to do the real work. */ | |
272 | if (! nios2_elf32_size_stubs (link_info.output_bfd, | |
273 | stub_file->the_bfd, | |
274 | &link_info, | |
275 | &nios2elf_add_stub_section, | |
276 | &nios2elf_layout_sections_again)) | |
277 | { | |
d003af55 | 278 | einfo (_("%X%P: can not size stub section: %E\n")); |
78058a5e SL |
279 | return; |
280 | } | |
281 | } | |
282 | } | |
283 | ||
284 | if (need_laying_out != -1) | |
285 | gld${EMULATION_NAME}_map_segments (need_laying_out); | |
286 | ||
0e1862bb | 287 | if (!bfd_link_relocatable (&link_info) && RELAXATION_ENABLED) |
78058a5e SL |
288 | { |
289 | /* Now build the linker stubs. */ | |
290 | if (stub_file != NULL && stub_file->the_bfd->sections != NULL) | |
291 | { | |
292 | if (! nios2_elf32_build_stubs (&link_info)) | |
d003af55 | 293 | einfo (_("%X%P: can not build stubs: %E\n")); |
78058a5e SL |
294 | } |
295 | } | |
296 | } | |
297 | ||
298 | ||
299 | /* Avoid processing the fake stub_file in vercheck, stat_needed and | |
300 | check_needed routines. */ | |
301 | ||
302 | static void (*real_func) (lang_input_statement_type *); | |
303 | ||
304 | static void nios2_for_each_input_file_wrapper (lang_input_statement_type *l) | |
305 | { | |
306 | if (l != stub_file) | |
307 | (*real_func) (l); | |
308 | } | |
309 | ||
310 | static void | |
311 | nios2_lang_for_each_input_file (void (*func) (lang_input_statement_type *)) | |
312 | { | |
313 | real_func = func; | |
314 | lang_for_each_input_file (&nios2_for_each_input_file_wrapper); | |
315 | } | |
316 | ||
317 | #define lang_for_each_input_file nios2_lang_for_each_input_file | |
318 | ||
319 | EOF | |
320 | ||
321 | ||
322 | # Put these extra nios2elf routines in ld_${EMULATION_NAME}_emulation | |
323 | # | |
324 | LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation | |
325 | LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=nios2elf_create_output_section_statements |