Commit | Line | Data |
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1f808cd5 | 1 | # This shell script emits a C file. -*- C -*- |
e0468e59 | 2 | # Copyright 2002, 2003 Free Software Foundation, Inc. |
1f808cd5 AM |
3 | # |
4 | # This file is part of GLD, the Gnu Linker. | |
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 2 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
19 | # | |
20 | ||
21 | # This file is sourced from elf32.em, and defines extra powerpc64-elf | |
22 | # specific routines. | |
23 | # | |
24 | cat >>e${EMULATION_NAME}.c <<EOF | |
25 | ||
9c1d81c1 | 26 | #include "ldctor.h" |
805fc799 | 27 | #include "libbfd.h" |
1f808cd5 AM |
28 | #include "elf64-ppc.h" |
29 | ||
9c1d81c1 AM |
30 | /* Fake input file for stubs. */ |
31 | static lang_input_statement_type *stub_file; | |
32 | ||
33 | /* Whether we need to call ppc_layout_sections_again. */ | |
1f808cd5 AM |
34 | static int need_laying_out = 0; |
35 | ||
9c1d81c1 AM |
36 | /* Maximum size of a group of input sections that can be handled by |
37 | one stub section. A value of +/-1 indicates the bfd back-end | |
38 | should use a suitable default size. */ | |
39 | static bfd_signed_vma group_size = 1; | |
40 | ||
fac1652d AM |
41 | /* Whether to add ".foo" entries for each "foo" in a version script. */ |
42 | static int dotsyms = 1; | |
43 | ||
e5096e3f AM |
44 | /* Whether to run tls optimization. */ |
45 | static int notlsopt = 0; | |
46 | ||
b34976b6 AM |
47 | static void ppc_create_output_section_statements |
48 | PARAMS ((void)); | |
49 | static void ppc_after_open | |
50 | PARAMS ((void)); | |
51 | static void ppc_before_allocation | |
52 | PARAMS ((void)); | |
53 | static asection *ppc_add_stub_section | |
54 | PARAMS ((const char *, asection *)); | |
55 | static void ppc_layout_sections_again | |
56 | PARAMS ((void)); | |
57 | static void gld${EMULATION_NAME}_after_allocation | |
58 | PARAMS ((void)); | |
59 | static void build_section_lists | |
60 | PARAMS ((lang_statement_union_type *)); | |
fac1652d AM |
61 | static struct bfd_elf_version_expr *gld${EMULATION_NAME}_new_vers_pattern |
62 | PARAMS ((struct bfd_elf_version_expr *)); | |
9c1d81c1 AM |
63 | |
64 | /* This is called before the input files are opened. We create a new | |
65 | fake input file to hold the stub sections. */ | |
66 | ||
67 | static void | |
68 | ppc_create_output_section_statements () | |
69 | { | |
a015f5ec AM |
70 | extern const bfd_target bfd_elf64_powerpc_vec; |
71 | extern const bfd_target bfd_elf64_powerpcle_vec; | |
72 | ||
73 | if (link_info.hash->creator != &bfd_elf64_powerpc_vec | |
74 | && link_info.hash->creator != &bfd_elf64_powerpcle_vec) | |
75 | return; | |
76 | ||
9c1d81c1 AM |
77 | stub_file = lang_add_input_file ("linker stubs", |
78 | lang_input_file_is_fake_enum, | |
79 | NULL); | |
80 | stub_file->the_bfd = bfd_create ("linker stubs", output_bfd); | |
81 | if (stub_file->the_bfd == NULL | |
82 | || !bfd_set_arch_mach (stub_file->the_bfd, | |
83 | bfd_get_arch (output_bfd), | |
84 | bfd_get_mach (output_bfd))) | |
85 | { | |
86 | einfo ("%X%P: can not create BFD %E\n"); | |
87 | return; | |
88 | } | |
89 | ||
90 | ldlang_add_file (stub_file); | |
91 | } | |
92 | ||
e3e942e9 AM |
93 | static void |
94 | ppc_after_open () | |
95 | { | |
96 | if (!ppc64_elf_mark_entry_syms (&link_info)) | |
97 | { | |
98 | einfo ("%X%P: can not mark entry symbols %E\n"); | |
99 | return; | |
100 | } | |
101 | ||
102 | gld${EMULATION_NAME}_after_open (); | |
103 | } | |
9c1d81c1 | 104 | |
836c6af1 AM |
105 | static void |
106 | ppc_before_allocation () | |
107 | { | |
a015f5ec | 108 | if (stub_file != NULL) |
e0468e59 | 109 | { |
a015f5ec | 110 | if (!ppc64_elf_edit_opd (output_bfd, &link_info)) |
e5096e3f | 111 | { |
a015f5ec | 112 | einfo ("%X%P: can not edit opd %E\n"); |
e5096e3f AM |
113 | return; |
114 | } | |
115 | ||
a015f5ec AM |
116 | if (ppc64_elf_tls_setup (output_bfd, &link_info) && !notlsopt) |
117 | { | |
118 | /* Size the sections. This is premature, but we want to know the | |
119 | TLS segment layout so that certain optimizations can be done. */ | |
120 | lang_size_sections (stat_ptr->head, abs_output_section, | |
cf888e70 | 121 | &stat_ptr->head, 0, (bfd_vma) 0, NULL, TRUE); |
a015f5ec AM |
122 | |
123 | if (!ppc64_elf_tls_optimize (output_bfd, &link_info)) | |
124 | { | |
125 | einfo ("%X%P: TLS problem %E\n"); | |
126 | return; | |
127 | } | |
128 | ||
129 | lang_reset_memory_regions (); | |
130 | } | |
e0468e59 AM |
131 | } |
132 | ||
836c6af1 AM |
133 | gld${EMULATION_NAME}_before_allocation (); |
134 | } | |
135 | ||
9c1d81c1 AM |
136 | struct hook_stub_info |
137 | { | |
138 | lang_statement_list_type add; | |
139 | asection *input_section; | |
140 | }; | |
141 | ||
142 | /* Traverse the linker tree to find the spot where the stub goes. */ | |
143 | ||
b34976b6 | 144 | static bfd_boolean hook_in_stub |
9c1d81c1 AM |
145 | PARAMS ((struct hook_stub_info *, lang_statement_union_type **)); |
146 | ||
b34976b6 | 147 | static bfd_boolean |
9c1d81c1 AM |
148 | hook_in_stub (info, lp) |
149 | struct hook_stub_info *info; | |
150 | lang_statement_union_type **lp; | |
151 | { | |
152 | lang_statement_union_type *l; | |
b34976b6 | 153 | bfd_boolean ret; |
9c1d81c1 AM |
154 | |
155 | for (; (l = *lp) != NULL; lp = &l->header.next) | |
156 | { | |
157 | switch (l->header.type) | |
158 | { | |
159 | case lang_constructors_statement_enum: | |
160 | ret = hook_in_stub (info, &constructor_list.head); | |
161 | if (ret) | |
162 | return ret; | |
163 | break; | |
164 | ||
165 | case lang_output_section_statement_enum: | |
166 | ret = hook_in_stub (info, | |
167 | &l->output_section_statement.children.head); | |
168 | if (ret) | |
169 | return ret; | |
170 | break; | |
171 | ||
172 | case lang_wild_statement_enum: | |
173 | ret = hook_in_stub (info, &l->wild_statement.children.head); | |
174 | if (ret) | |
175 | return ret; | |
176 | break; | |
177 | ||
178 | case lang_group_statement_enum: | |
179 | ret = hook_in_stub (info, &l->group_statement.children.head); | |
180 | if (ret) | |
181 | return ret; | |
182 | break; | |
183 | ||
184 | case lang_input_section_enum: | |
185 | if (l->input_section.section == info->input_section) | |
186 | { | |
187 | /* We've found our section. Insert the stub immediately | |
188 | before its associated input section. */ | |
189 | *lp = info->add.head; | |
190 | *(info->add.tail) = l; | |
b34976b6 | 191 | return TRUE; |
9c1d81c1 AM |
192 | } |
193 | break; | |
194 | ||
195 | case lang_data_statement_enum: | |
196 | case lang_reloc_statement_enum: | |
197 | case lang_object_symbols_statement_enum: | |
198 | case lang_output_statement_enum: | |
199 | case lang_target_statement_enum: | |
200 | case lang_input_statement_enum: | |
201 | case lang_assignment_statement_enum: | |
202 | case lang_padding_statement_enum: | |
203 | case lang_address_statement_enum: | |
204 | case lang_fill_statement_enum: | |
205 | break; | |
206 | ||
207 | default: | |
208 | FAIL (); | |
209 | break; | |
210 | } | |
211 | } | |
b34976b6 | 212 | return FALSE; |
9c1d81c1 AM |
213 | } |
214 | ||
215 | ||
216 | /* Call-back for ppc64_elf_size_stubs. */ | |
217 | ||
218 | /* Create a new stub section, and arrange for it to be linked | |
219 | immediately before INPUT_SECTION. */ | |
220 | ||
221 | static asection * | |
222 | ppc_add_stub_section (stub_sec_name, input_section) | |
223 | const char *stub_sec_name; | |
224 | asection *input_section; | |
225 | { | |
226 | asection *stub_sec; | |
227 | flagword flags; | |
228 | asection *output_section; | |
229 | const char *secname; | |
230 | lang_output_section_statement_type *os; | |
231 | struct hook_stub_info info; | |
232 | ||
233 | stub_sec = bfd_make_section_anyway (stub_file->the_bfd, stub_sec_name); | |
234 | if (stub_sec == NULL) | |
235 | goto err_ret; | |
236 | ||
237 | flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE | |
238 | | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP); | |
239 | if (!bfd_set_section_flags (stub_file->the_bfd, stub_sec, flags)) | |
240 | goto err_ret; | |
241 | ||
242 | output_section = input_section->output_section; | |
243 | secname = bfd_get_section_name (output_section->owner, output_section); | |
244 | os = lang_output_section_find (secname); | |
245 | ||
246 | info.input_section = input_section; | |
247 | lang_list_init (&info.add); | |
248 | lang_add_section (&info.add, stub_sec, os, stub_file); | |
249 | ||
250 | if (info.add.head == NULL) | |
251 | goto err_ret; | |
252 | ||
253 | if (hook_in_stub (&info, &os->children.head)) | |
254 | return stub_sec; | |
255 | ||
256 | err_ret: | |
257 | einfo ("%X%P: can not make stub section: %E\n"); | |
258 | return NULL; | |
259 | } | |
260 | ||
261 | ||
262 | /* Another call-back for ppc64_elf_size_stubs. */ | |
263 | ||
264 | static void | |
265 | ppc_layout_sections_again () | |
266 | { | |
267 | /* If we have changed sizes of the stub sections, then we need | |
268 | to recalculate all the section offsets. This may mean we need to | |
269 | add even more stubs. */ | |
270 | need_laying_out = 0; | |
271 | ||
272 | lang_reset_memory_regions (); | |
273 | ||
274 | /* Resize the sections. */ | |
275 | lang_size_sections (stat_ptr->head, abs_output_section, | |
cf888e70 | 276 | &stat_ptr->head, 0, (bfd_vma) 0, NULL, TRUE); |
9c1d81c1 AM |
277 | |
278 | /* Recalculate TOC base. */ | |
279 | ldemul_after_allocation (); | |
280 | ||
281 | /* Do the assignments again. */ | |
282 | lang_do_assignments (stat_ptr->head, abs_output_section, | |
283 | (fill_type *) 0, (bfd_vma) 0); | |
284 | } | |
285 | ||
1f808cd5 AM |
286 | |
287 | /* Call the back-end function to set TOC base after we have placed all | |
288 | the sections. */ | |
289 | static void | |
290 | gld${EMULATION_NAME}_after_allocation () | |
291 | { | |
805fc799 AM |
292 | if (!link_info.relocateable) |
293 | _bfd_set_gp_value (output_bfd, ppc64_elf_toc (output_bfd)); | |
1f808cd5 AM |
294 | } |
295 | ||
9c1d81c1 AM |
296 | |
297 | static void | |
298 | build_section_lists (statement) | |
299 | lang_statement_union_type *statement; | |
300 | { | |
301 | if (statement->header.type == lang_input_section_enum | |
805fc799 AM |
302 | && !statement->input_section.ifile->just_syms_flag |
303 | && statement->input_section.section->output_section != NULL | |
304 | && statement->input_section.section->output_section->owner == output_bfd) | |
9c1d81c1 | 305 | { |
805fc799 | 306 | ppc64_elf_next_input_section (&link_info, |
9c1d81c1 AM |
307 | statement->input_section.section); |
308 | } | |
309 | } | |
310 | ||
fac1652d | 311 | |
9c1d81c1 | 312 | /* Final emulation specific call. */ |
1f808cd5 AM |
313 | |
314 | static void | |
315 | gld${EMULATION_NAME}_finish () | |
316 | { | |
1e281515 AM |
317 | /* e_entry on PowerPC64 points to the function descriptor for |
318 | _start. If _start is missing, default to the first function | |
319 | descriptor in the .opd section. */ | |
320 | entry_section = ".opd"; | |
321 | ||
1f808cd5 AM |
322 | /* bfd_elf64_discard_info just plays with debugging sections, |
323 | ie. doesn't affect any code, so we can delay resizing the | |
324 | sections. It's likely we'll resize everything in the process of | |
9c1d81c1 | 325 | adding stubs. */ |
1f808cd5 AM |
326 | if (bfd_elf${ELFSIZE}_discard_info (output_bfd, &link_info)) |
327 | need_laying_out = 1; | |
328 | ||
836c6af1 AM |
329 | /* If generating a relocatable output file, then we don't have any |
330 | stubs. */ | |
a015f5ec | 331 | if (stub_file != NULL && !link_info.relocateable) |
1f808cd5 | 332 | { |
836c6af1 AM |
333 | int ret = ppc64_elf_setup_section_lists (output_bfd, &link_info); |
334 | if (ret != 0) | |
9c1d81c1 | 335 | { |
836c6af1 AM |
336 | if (ret < 0) |
337 | { | |
338 | einfo ("%X%P: can not size stub section: %E\n"); | |
339 | return; | |
340 | } | |
9c1d81c1 | 341 | |
836c6af1 | 342 | lang_for_each_statement (build_section_lists); |
9c1d81c1 | 343 | |
836c6af1 AM |
344 | /* Call into the BFD backend to do the real work. */ |
345 | if (!ppc64_elf_size_stubs (output_bfd, | |
346 | stub_file->the_bfd, | |
347 | &link_info, | |
348 | group_size, | |
349 | &ppc_add_stub_section, | |
350 | &ppc_layout_sections_again)) | |
351 | { | |
352 | einfo ("%X%P: can not size stub section: %E\n"); | |
353 | return; | |
354 | } | |
1f808cd5 | 355 | } |
9c1d81c1 | 356 | } |
1f808cd5 | 357 | |
9c1d81c1 AM |
358 | if (need_laying_out) |
359 | ppc_layout_sections_again (); | |
1f808cd5 | 360 | |
a015f5ec | 361 | if (stub_file != NULL && stub_file->the_bfd->sections != NULL) |
9c1d81c1 AM |
362 | { |
363 | if (!ppc64_elf_build_stubs (&link_info)) | |
364 | einfo ("%X%P: can not build stubs: %E\n"); | |
365 | } | |
366 | } | |
1f808cd5 | 367 | |
76dc39fe | 368 | |
fac1652d AM |
369 | /* Add a pattern matching ".foo" for every "foo" in a version script. |
370 | ||
371 | The reason for doing this is that many shared library version | |
372 | scripts export a selected set of functions or data symbols, forcing | |
373 | others local. eg. | |
374 | ||
375 | . VERS_1 { | |
376 | . global: | |
377 | . this; that; some; thing; | |
378 | . local: | |
379 | . *; | |
380 | . }; | |
381 | ||
382 | To make the above work for PowerPC64, we need to export ".this", | |
383 | ".that" and so on, otherwise only the function descriptor syms are | |
384 | exported. Lack of an exported function code sym may cause a | |
385 | definition to be pulled in from a static library. */ | |
386 | ||
387 | struct bfd_elf_version_expr * | |
388 | gld${EMULATION_NAME}_new_vers_pattern (entry) | |
389 | struct bfd_elf_version_expr *entry; | |
390 | { | |
391 | struct bfd_elf_version_expr *dot_entry; | |
392 | struct bfd_elf_version_expr *next; | |
393 | unsigned int len; | |
394 | char *dot_pat; | |
395 | ||
396 | if (!dotsyms || entry->pattern[0] == '*') | |
397 | return entry; | |
398 | ||
399 | /* Is the script adding ".foo" explicitly? */ | |
400 | if (entry->pattern[0] == '.') | |
401 | { | |
402 | /* We may have added this pattern automatically. Don't add it | |
403 | again. Quadratic behaviour here is acceptable as the list | |
404 | may be traversed for each input bfd symbol. */ | |
405 | for (next = entry->next; next != NULL; next = next->next) | |
406 | { | |
407 | if (strcmp (next->pattern, entry->pattern) == 0 | |
408 | && next->match == entry->match) | |
409 | { | |
410 | next = entry->next; | |
eb95bb9a | 411 | free ((char *) entry->pattern); |
fac1652d AM |
412 | free (entry); |
413 | return next; | |
414 | } | |
415 | } | |
416 | return entry; | |
417 | } | |
418 | ||
419 | /* Don't add ".foo" if the script has already done so. */ | |
420 | for (next = entry->next; next != NULL; next = next->next) | |
421 | { | |
422 | if (next->pattern[0] == '.' | |
423 | && strcmp (next->pattern + 1, entry->pattern) == 0 | |
424 | && next->match == entry->match) | |
425 | return entry; | |
426 | } | |
427 | ||
428 | dot_entry = (struct bfd_elf_version_expr *) xmalloc (sizeof *dot_entry); | |
429 | dot_entry->next = entry; | |
430 | len = strlen (entry->pattern) + 2; | |
431 | dot_pat = xmalloc (len); | |
432 | dot_pat[0] = '.'; | |
433 | memcpy (dot_pat + 1, entry->pattern, len - 1); | |
434 | dot_entry->pattern = dot_pat; | |
435 | dot_entry->match = entry->match; | |
436 | return dot_entry; | |
437 | } | |
438 | ||
439 | ||
9c1d81c1 AM |
440 | /* Avoid processing the fake stub_file in vercheck, stat_needed and |
441 | check_needed routines. */ | |
1f808cd5 | 442 | |
9c1d81c1 AM |
443 | static void ppc_for_each_input_file_wrapper |
444 | PARAMS ((lang_input_statement_type *)); | |
445 | static void ppc_lang_for_each_input_file | |
446 | PARAMS ((void (*) (lang_input_statement_type *))); | |
1f808cd5 | 447 | |
9c1d81c1 | 448 | static void (*real_func) PARAMS ((lang_input_statement_type *)); |
1f808cd5 | 449 | |
9c1d81c1 AM |
450 | static void ppc_for_each_input_file_wrapper (l) |
451 | lang_input_statement_type *l; | |
452 | { | |
453 | if (l != stub_file) | |
454 | (*real_func) (l); | |
1f808cd5 | 455 | } |
9c1d81c1 AM |
456 | |
457 | static void | |
458 | ppc_lang_for_each_input_file (func) | |
459 | void (*func) PARAMS ((lang_input_statement_type *)); | |
460 | { | |
461 | real_func = func; | |
462 | lang_for_each_input_file (&ppc_for_each_input_file_wrapper); | |
463 | } | |
464 | ||
465 | #define lang_for_each_input_file ppc_lang_for_each_input_file | |
466 | ||
1f808cd5 AM |
467 | EOF |
468 | ||
9c1d81c1 AM |
469 | # Define some shell vars to insert bits of code into the standard elf |
470 | # parse_args and list_options functions. | |
471 | # | |
472 | PARSE_AND_LIST_PROLOGUE=' | |
473 | #define OPTION_STUBGROUP_SIZE 301 | |
fac1652d AM |
474 | #define OPTION_DOTSYMS (OPTION_STUBGROUP_SIZE + 1) |
475 | #define OPTION_NO_DOTSYMS (OPTION_DOTSYMS + 1) | |
e5096e3f | 476 | #define OPTION_NO_TLS_OPT (OPTION_NO_DOTSYMS + 1) |
9c1d81c1 AM |
477 | ' |
478 | ||
9c1d81c1 AM |
479 | PARSE_AND_LIST_LONGOPTS=' |
480 | { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE }, | |
fac1652d AM |
481 | { "dotsyms", no_argument, NULL, OPTION_DOTSYMS }, |
482 | { "no-dotsyms", no_argument, NULL, OPTION_NO_DOTSYMS }, | |
e5096e3f | 483 | { "no-tls-optimize", no_argument, NULL, OPTION_NO_TLS_OPT }, |
9c1d81c1 AM |
484 | ' |
485 | ||
486 | PARSE_AND_LIST_OPTIONS=' | |
487 | fprintf (file, _("\ | |
488 | --stub-group-size=N Maximum size of a group of input sections that can be\n\ | |
489 | handled by one stub section. A negative value\n\ | |
490 | locates all stubs before their branches (with a\n\ | |
491 | group size of -N), while a positive value allows\n\ | |
492 | two groups of input sections, one before, and one\n\ | |
493 | after each stub section. Values of +/-1 indicate\n\ | |
494 | the linker should choose suitable defaults.\n" | |
495 | )); | |
fac1652d AM |
496 | fprintf (file, _("\ |
497 | --dotsyms For every version pattern \"foo\" in a version script,\n\ | |
498 | add \".foo\" so that function code symbols are\n\ | |
499 | treated the same as function descriptor symbols.\n\ | |
500 | Defaults to on.\n" | |
501 | )); | |
502 | fprintf (file, _("\ | |
503 | --no-dotsyms Don'\''t do anything special in version scripts.\n" | |
504 | )); | |
e5096e3f AM |
505 | fprintf (file, _("\ |
506 | --no-tls-optimize Don'\''t try to optimize TLS accesses.\n" | |
507 | )); | |
9c1d81c1 AM |
508 | ' |
509 | ||
510 | PARSE_AND_LIST_ARGS_CASES=' | |
511 | case OPTION_STUBGROUP_SIZE: | |
512 | { | |
513 | const char *end; | |
514 | group_size = bfd_scan_vma (optarg, &end, 0); | |
515 | if (*end) | |
516 | einfo (_("%P%F: invalid number `%s'\''\n"), optarg); | |
517 | } | |
518 | break; | |
fac1652d AM |
519 | |
520 | case OPTION_DOTSYMS: | |
e5096e3f | 521 | dotsyms = 1; |
fac1652d AM |
522 | break; |
523 | ||
524 | case OPTION_NO_DOTSYMS: | |
e5096e3f AM |
525 | dotsyms = 0; |
526 | break; | |
527 | ||
528 | case OPTION_NO_TLS_OPT: | |
529 | notlsopt = 1; | |
fac1652d | 530 | break; |
9c1d81c1 AM |
531 | ' |
532 | ||
1f808cd5 AM |
533 | # Put these extra ppc64elf routines in ld_${EMULATION_NAME}_emulation |
534 | # | |
e3e942e9 | 535 | LDEMUL_AFTER_OPEN=ppc_after_open |
836c6af1 | 536 | LDEMUL_BEFORE_ALLOCATION=ppc_before_allocation |
1f808cd5 AM |
537 | LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation |
538 | LDEMUL_FINISH=gld${EMULATION_NAME}_finish | |
9c1d81c1 | 539 | LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=ppc_create_output_section_statements |
fac1652d | 540 | LDEMUL_NEW_VERS_PATTERN=gld${EMULATION_NAME}_new_vers_pattern |