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