1 # This shell script emits a C file. -*- C -*-
2 # Copyright 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
3 # Free Software Foundation, Inc.
5 # This file is part of the GNU Binutils.
7 # This program is free software; you can redistribute it and/or modify
8 # it under the terms of the GNU General Public License as published by
9 # the Free Software Foundation; either version 3 of the License, or
10 # (at your option) any later version.
12 # This program is distributed in the hope that it will be useful,
13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 # GNU General Public License for more details.
17 # You should have received a copy of the GNU General Public License
18 # along with this program; if not, write to the Free Software
19 # Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
23 # This file is sourced from elf32.em, and defines extra powerpc64-elf
31 #include "elf64-ppc.h"
33 /* Fake input file for stubs. */
34 static lang_input_statement_type *stub_file;
35 static int stub_added = 0;
37 /* Whether we need to call ppc_layout_sections_again. */
38 static int need_laying_out = 0;
40 /* Maximum size of a group of input sections that can be handled by
41 one stub section. A value of +/-1 indicates the bfd back-end
42 should use a suitable default size. */
43 static bfd_signed_vma group_size = 1;
45 /* Whether to add ".foo" entries for each "foo" in a version script. */
46 static int dotsyms = 1;
48 /* Whether to run tls optimization. */
49 static int no_tls_opt = 0;
50 static int no_tls_get_addr_opt = 0;
52 /* Whether to run opd optimization. */
53 static int no_opd_opt = 0;
55 /* Whether to run toc optimization. */
56 static int no_toc_opt = 0;
58 /* Whether to allow multiple toc sections. */
59 static int no_multi_toc = 0;
61 /* Whether to emit symbols for stubs. */
62 static int emit_stub_syms = -1;
64 static asection *toc_section = 0;
66 /* Whether to canonicalize .opd so that there are no overlapping
68 static int non_overlapping_opd = 0;
70 /* This is called before the input files are opened. We create a new
71 fake input file to hold the stub sections. */
74 ppc_create_output_section_statements (void)
76 if (!(bfd_get_flavour (link_info.output_bfd) == bfd_target_elf_flavour
77 && elf_object_id (link_info.output_bfd) == PPC64_ELF_TDATA))
80 link_info.wrap_char = '.';
82 stub_file = lang_add_input_file ("linker stubs",
83 lang_input_file_is_fake_enum,
85 stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd);
86 if (stub_file->the_bfd == NULL
87 || !bfd_set_arch_mach (stub_file->the_bfd,
88 bfd_get_arch (link_info.output_bfd),
89 bfd_get_mach (link_info.output_bfd)))
91 einfo ("%F%P: can not create BFD %E\n");
95 stub_file->the_bfd->flags |= BFD_LINKER_CREATED;
96 ldlang_add_file (stub_file);
97 ppc64_elf_init_stub_bfd (stub_file->the_bfd, &link_info);
101 ppc_before_allocation (void)
103 if (stub_file != NULL)
106 && !ppc64_elf_edit_opd (link_info.output_bfd, &link_info,
107 non_overlapping_opd))
108 einfo ("%X%P: can not edit %s %E\n", "opd");
110 if (ppc64_elf_tls_setup (link_info.output_bfd, &link_info,
114 /* Size the sections. This is premature, but we want to know the
115 TLS segment layout so that certain optimizations can be done. */
116 expld.phase = lang_mark_phase_enum;
117 expld.dataseg.phase = exp_dataseg_none;
118 one_lang_size_sections_pass (NULL, TRUE);
120 if (!ppc64_elf_tls_optimize (link_info.output_bfd, &link_info))
121 einfo ("%X%P: TLS problem %E\n");
123 /* We must not cache anything from the preliminary sizing. */
124 lang_reset_memory_regions ();
128 && !link_info.relocatable
129 && !ppc64_elf_edit_toc (link_info.output_bfd, &link_info))
130 einfo ("%X%P: can not edit %s %E\n", "toc");
133 gld${EMULATION_NAME}_before_allocation ();
136 struct hook_stub_info
138 lang_statement_list_type add;
139 asection *input_section;
142 /* Traverse the linker tree to find the spot where the stub goes. */
145 hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp)
147 lang_statement_union_type *l;
150 for (; (l = *lp) != NULL; lp = &l->header.next)
152 switch (l->header.type)
154 case lang_constructors_statement_enum:
155 ret = hook_in_stub (info, &constructor_list.head);
160 case lang_output_section_statement_enum:
161 ret = hook_in_stub (info,
162 &l->output_section_statement.children.head);
167 case lang_wild_statement_enum:
168 ret = hook_in_stub (info, &l->wild_statement.children.head);
173 case lang_group_statement_enum:
174 ret = hook_in_stub (info, &l->group_statement.children.head);
179 case lang_input_section_enum:
180 if (l->input_section.section == info->input_section)
182 /* We've found our section. Insert the stub immediately
183 before its associated input section. */
184 *lp = info->add.head;
185 *(info->add.tail) = l;
190 case lang_data_statement_enum:
191 case lang_reloc_statement_enum:
192 case lang_object_symbols_statement_enum:
193 case lang_output_statement_enum:
194 case lang_target_statement_enum:
195 case lang_input_statement_enum:
196 case lang_assignment_statement_enum:
197 case lang_padding_statement_enum:
198 case lang_address_statement_enum:
199 case lang_fill_statement_enum:
211 /* Call-back for ppc64_elf_size_stubs. */
213 /* Create a new stub section, and arrange for it to be linked
214 immediately before INPUT_SECTION. */
217 ppc_add_stub_section (const char *stub_sec_name, asection *input_section)
221 asection *output_section;
223 lang_output_section_statement_type *os;
224 struct hook_stub_info info;
226 flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
227 | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_KEEP);
228 stub_sec = bfd_make_section_anyway_with_flags (stub_file->the_bfd,
229 stub_sec_name, flags);
230 if (stub_sec == NULL)
233 output_section = input_section->output_section;
234 secname = bfd_get_section_name (output_section->owner, output_section);
235 os = lang_output_section_find (secname);
237 info.input_section = input_section;
238 lang_list_init (&info.add);
239 lang_add_section (&info.add, stub_sec, os);
241 if (info.add.head == NULL)
245 if (hook_in_stub (&info, &os->children.head))
249 einfo ("%X%P: can not make stub section: %E\n");
254 /* Another call-back for ppc64_elf_size_stubs. */
257 ppc_layout_sections_again (void)
259 /* If we have changed sizes of the stub sections, then we need
260 to recalculate all the section offsets. This may mean we need to
261 add even more stubs. */
262 gld${EMULATION_NAME}_map_segments (TRUE);
264 if (!link_info.relocatable)
265 _bfd_set_gp_value (link_info.output_bfd,
266 ppc64_elf_toc (link_info.output_bfd));
268 need_laying_out = -1;
273 build_toc_list (lang_statement_union_type *statement)
275 if (statement->header.type == lang_input_section_enum)
277 asection *i = statement->input_section.section;
279 if (!((lang_input_statement_type *) i->owner->usrdata)->just_syms_flag
280 && (i->flags & SEC_EXCLUDE) == 0
281 && i->output_section == toc_section)
283 if (!ppc64_elf_next_toc_section (&link_info, i))
284 einfo ("%X%P: linker script separates .got and .toc\n");
291 build_section_lists (lang_statement_union_type *statement)
293 if (statement->header.type == lang_input_section_enum)
295 asection *i = statement->input_section.section;
297 if (!((lang_input_statement_type *) i->owner->usrdata)->just_syms_flag
298 && (i->flags & SEC_EXCLUDE) == 0
299 && i->output_section != NULL
300 && i->output_section->owner == link_info.output_bfd)
302 if (!ppc64_elf_next_input_section (&link_info, i))
303 einfo ("%X%P: can not size stub section: %E\n");
309 /* Call the back-end function to set TOC base after we have placed all
312 gld${EMULATION_NAME}_after_allocation (void)
314 /* bfd_elf_discard_info just plays with data and debugging sections,
315 ie. doesn't affect code size, so we can delay resizing the
316 sections. It's likely we'll resize everything in the process of
318 if (bfd_elf_discard_info (link_info.output_bfd, &link_info))
321 /* If generating a relocatable output file, then we don't have any
323 if (stub_file != NULL && !link_info.relocatable)
325 int ret = ppc64_elf_setup_section_lists (&link_info,
326 &ppc_add_stub_section,
327 &ppc_layout_sections_again);
329 einfo ("%X%P: can not size stub section: %E\n");
332 ppc64_elf_start_multitoc_partition (&link_info);
336 toc_section = bfd_get_section_by_name (link_info.output_bfd,
338 if (toc_section != NULL)
339 lang_for_each_statement (build_toc_list);
342 if (ppc64_elf_layout_multitoc (&link_info)
344 && toc_section != NULL)
345 lang_for_each_statement (build_toc_list);
347 ppc64_elf_finish_multitoc_partition (&link_info);
349 lang_for_each_statement (build_section_lists);
351 /* Call into the BFD backend to do the real work. */
352 if (!ppc64_elf_size_stubs (&link_info, group_size))
353 einfo ("%X%P: can not size stub section: %E\n");
357 if (need_laying_out != -1)
359 gld${EMULATION_NAME}_map_segments (need_laying_out);
361 if (!link_info.relocatable)
362 _bfd_set_gp_value (link_info.output_bfd,
363 ppc64_elf_toc (link_info.output_bfd));
368 /* Final emulation specific call. */
371 gld${EMULATION_NAME}_finish (void)
373 /* e_entry on PowerPC64 points to the function descriptor for
374 _start. If _start is missing, default to the first function
375 descriptor in the .opd section. */
376 entry_section = ".opd";
378 if (link_info.relocatable)
380 asection *toc = bfd_get_section_by_name (link_info.output_bfd, ".toc");
382 && bfd_section_size (link_info.output_bfd, toc) > 0x10000)
383 einfo ("%X%P: TOC section size exceeds 64k\n");
389 char *line, *endline;
391 if (emit_stub_syms < 0)
393 if (!ppc64_elf_build_stubs (emit_stub_syms, &link_info,
394 config.stats ? &msg : NULL))
395 einfo ("%X%P: can not build stubs: %E\n");
397 for (line = msg; line != NULL; line = endline)
399 endline = strchr (line, '\n');
402 fprintf (stderr, "%s: %s\n", program_name, line);
408 ppc64_elf_restore_symbols (&link_info);
413 /* Add a pattern matching ".foo" for every "foo" in a version script.
415 The reason for doing this is that many shared library version
416 scripts export a selected set of functions or data symbols, forcing
421 . this; that; some; thing;
426 To make the above work for PowerPC64, we need to export ".this",
427 ".that" and so on, otherwise only the function descriptor syms are
428 exported. Lack of an exported function code sym may cause a
429 definition to be pulled in from a static library. */
431 static struct bfd_elf_version_expr *
432 gld${EMULATION_NAME}_new_vers_pattern (struct bfd_elf_version_expr *entry)
434 struct bfd_elf_version_expr *dot_entry;
439 || entry->pattern[0] == '.'
440 || (!entry->literal && entry->pattern[0] == '*'))
443 dot_entry = xmalloc (sizeof *dot_entry);
445 dot_entry->next = entry;
446 len = strlen (entry->pattern) + 2;
447 dot_pat = xmalloc (len);
449 memcpy (dot_pat + 1, entry->pattern, len - 1);
450 dot_entry->pattern = dot_pat;
455 /* Avoid processing the fake stub_file in vercheck, stat_needed and
456 check_needed routines. */
458 static void (*real_func) (lang_input_statement_type *);
460 static void ppc_for_each_input_file_wrapper (lang_input_statement_type *l)
467 ppc_lang_for_each_input_file (void (*func) (lang_input_statement_type *))
470 lang_for_each_input_file (&ppc_for_each_input_file_wrapper);
473 #define lang_for_each_input_file ppc_lang_for_each_input_file
477 if grep -q 'ld_elf32_spu_emulation' ldemul-list.h; then
479 /* Special handling for embedded SPU executables. */
480 extern bfd_boolean embedded_spu_file (lang_input_statement_type *, const char *);
481 static bfd_boolean gld${EMULATION_NAME}_load_symbols (lang_input_statement_type *);
484 ppc64_recognized_file (lang_input_statement_type *entry)
486 if (embedded_spu_file (entry, "-m64"))
489 return gld${EMULATION_NAME}_load_symbols (entry);
492 LDEMUL_RECOGNIZED_FILE=ppc64_recognized_file
495 # Define some shell vars to insert bits of code into the standard elf
496 # parse_args and list_options functions.
498 PARSE_AND_LIST_PROLOGUE='
499 #define OPTION_STUBGROUP_SIZE 301
500 #define OPTION_STUBSYMS (OPTION_STUBGROUP_SIZE + 1)
501 #define OPTION_NO_STUBSYMS (OPTION_STUBSYMS + 1)
502 #define OPTION_DOTSYMS (OPTION_NO_STUBSYMS + 1)
503 #define OPTION_NO_DOTSYMS (OPTION_DOTSYMS + 1)
504 #define OPTION_NO_TLS_OPT (OPTION_NO_DOTSYMS + 1)
505 #define OPTION_NO_TLS_GET_ADDR_OPT (OPTION_NO_TLS_OPT + 1)
506 #define OPTION_NO_OPD_OPT (OPTION_NO_TLS_GET_ADDR_OPT + 1)
507 #define OPTION_NO_TOC_OPT (OPTION_NO_OPD_OPT + 1)
508 #define OPTION_NO_MULTI_TOC (OPTION_NO_TOC_OPT + 1)
509 #define OPTION_NON_OVERLAPPING_OPD (OPTION_NO_MULTI_TOC + 1)
512 PARSE_AND_LIST_LONGOPTS='
513 { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
514 { "emit-stub-syms", no_argument, NULL, OPTION_STUBSYMS },
515 { "no-emit-stub-syms", no_argument, NULL, OPTION_NO_STUBSYMS },
516 { "dotsyms", no_argument, NULL, OPTION_DOTSYMS },
517 { "no-dotsyms", no_argument, NULL, OPTION_NO_DOTSYMS },
518 { "no-tls-optimize", no_argument, NULL, OPTION_NO_TLS_OPT },
519 { "no-tls-get-addr-optimize", no_argument, NULL, OPTION_NO_TLS_GET_ADDR_OPT },
520 { "no-opd-optimize", no_argument, NULL, OPTION_NO_OPD_OPT },
521 { "no-toc-optimize", no_argument, NULL, OPTION_NO_TOC_OPT },
522 { "no-multi-toc", no_argument, NULL, OPTION_NO_MULTI_TOC },
523 { "non-overlapping-opd", no_argument, NULL, OPTION_NON_OVERLAPPING_OPD },
526 PARSE_AND_LIST_OPTIONS='
528 --stub-group-size=N Maximum size of a group of input sections that\n\
529 can be handled by one stub section. A negative\n\
530 value locates all stubs before their branches\n\
531 (with a group size of -N), while a positive\n\
532 value allows two groups of input sections, one\n\
533 before, and one after each stub section.\n\
534 Values of +/-1 indicate the linker should\n\
535 choose suitable defaults.\n"
538 --emit-stub-syms Label linker stubs with a symbol.\n"
541 --no-emit-stub-syms Don'\''t label linker stubs with a symbol.\n"
544 --dotsyms For every version pattern \"foo\" in a version\n\
545 script, add \".foo\" so that function code\n\
546 symbols are treated the same as function\n\
547 descriptor symbols. Defaults to on.\n"
550 --no-dotsyms Don'\''t do anything special in version scripts.\n"
553 --no-tls-optimize Don'\''t try to optimize TLS accesses.\n"
556 --no-tls-get-addr-optimize Don'\''t use a special __tls_get_addr call.\n"
559 --no-opd-optimize Don'\''t optimize the OPD section.\n"
562 --no-toc-optimize Don'\''t optimize the TOC section.\n"
565 --no-multi-toc Disallow automatic multiple toc sections.\n"
568 --non-overlapping-opd Canonicalize .opd, so that there are no\n\
569 overlapping .opd entries.\n"
573 PARSE_AND_LIST_ARGS_CASES='
574 case OPTION_STUBGROUP_SIZE:
577 group_size = bfd_scan_vma (optarg, &end, 0);
579 einfo (_("%P%F: invalid number `%s'\''\n"), optarg);
583 case OPTION_STUBSYMS:
587 case OPTION_NO_STUBSYMS:
595 case OPTION_NO_DOTSYMS:
599 case OPTION_NO_TLS_OPT:
603 case OPTION_NO_TLS_GET_ADDR_OPT:
604 no_tls_get_addr_opt = 1;
607 case OPTION_NO_OPD_OPT:
611 case OPTION_NO_TOC_OPT:
615 case OPTION_NO_MULTI_TOC:
619 case OPTION_NON_OVERLAPPING_OPD:
620 non_overlapping_opd = 1;
624 # Put these extra ppc64elf routines in ld_${EMULATION_NAME}_emulation
626 LDEMUL_BEFORE_ALLOCATION=ppc_before_allocation
627 LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
628 LDEMUL_FINISH=gld${EMULATION_NAME}_finish
629 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=ppc_create_output_section_statements
630 LDEMUL_NEW_VERS_PATTERN=gld${EMULATION_NAME}_new_vers_pattern