1 # This shell script emits a C file. -*- C -*-
2 # Copyright 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
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)
282 ppc64_elf_next_toc_section (&link_info, i);
288 build_section_lists (lang_statement_union_type *statement)
290 if (statement->header.type == lang_input_section_enum)
292 asection *i = statement->input_section.section;
294 if (!((lang_input_statement_type *) i->owner->usrdata)->just_syms_flag
295 && (i->flags & SEC_EXCLUDE) == 0
296 && i->output_section != NULL
297 && i->output_section->owner == link_info.output_bfd)
299 if (!ppc64_elf_next_input_section (&link_info, i))
300 einfo ("%X%P: can not size stub section: %E\n");
306 /* Call the back-end function to set TOC base after we have placed all
309 gld${EMULATION_NAME}_after_allocation (void)
311 /* bfd_elf_discard_info just plays with data and debugging sections,
312 ie. doesn't affect code size, so we can delay resizing the
313 sections. It's likely we'll resize everything in the process of
315 if (bfd_elf_discard_info (link_info.output_bfd, &link_info))
318 /* If generating a relocatable output file, then we don't have any
320 if (stub_file != NULL && !link_info.relocatable)
322 int ret = ppc64_elf_setup_section_lists (link_info.output_bfd,
326 einfo ("%X%P: can not size stub section: %E\n");
329 toc_section = bfd_get_section_by_name (link_info.output_bfd, ".got");
330 if (toc_section != NULL)
331 lang_for_each_statement (build_toc_list);
333 ppc64_elf_reinit_toc (link_info.output_bfd, &link_info);
335 lang_for_each_statement (build_section_lists);
337 /* Call into the BFD backend to do the real work. */
338 if (!ppc64_elf_size_stubs (link_info.output_bfd,
341 &ppc_add_stub_section,
342 &ppc_layout_sections_again))
343 einfo ("%X%P: can not size stub section: %E\n");
347 if (need_laying_out != -1)
349 gld${EMULATION_NAME}_map_segments (need_laying_out);
351 if (!link_info.relocatable)
352 _bfd_set_gp_value (link_info.output_bfd,
353 ppc64_elf_toc (link_info.output_bfd));
358 /* Final emulation specific call. */
361 gld${EMULATION_NAME}_finish (void)
363 /* e_entry on PowerPC64 points to the function descriptor for
364 _start. If _start is missing, default to the first function
365 descriptor in the .opd section. */
366 entry_section = ".opd";
368 if (link_info.relocatable)
370 asection *toc = bfd_get_section_by_name (link_info.output_bfd, ".toc");
372 && bfd_section_size (link_info.output_bfd, toc) > 0x10000)
373 einfo ("%X%P: TOC section size exceeds 64k\n");
379 char *line, *endline;
381 if (emit_stub_syms < 0)
383 if (!ppc64_elf_build_stubs (emit_stub_syms, &link_info,
384 config.stats ? &msg : NULL))
385 einfo ("%X%P: can not build stubs: %E\n");
387 for (line = msg; line != NULL; line = endline)
389 endline = strchr (line, '\n');
392 fprintf (stderr, "%s: %s\n", program_name, line);
398 ppc64_elf_restore_symbols (&link_info);
403 /* Add a pattern matching ".foo" for every "foo" in a version script.
405 The reason for doing this is that many shared library version
406 scripts export a selected set of functions or data symbols, forcing
411 . this; that; some; thing;
416 To make the above work for PowerPC64, we need to export ".this",
417 ".that" and so on, otherwise only the function descriptor syms are
418 exported. Lack of an exported function code sym may cause a
419 definition to be pulled in from a static library. */
421 static struct bfd_elf_version_expr *
422 gld${EMULATION_NAME}_new_vers_pattern (struct bfd_elf_version_expr *entry)
424 struct bfd_elf_version_expr *dot_entry;
429 || entry->pattern[0] == '.'
430 || (!entry->literal && entry->pattern[0] == '*'))
433 dot_entry = xmalloc (sizeof *dot_entry);
435 dot_entry->next = entry;
436 len = strlen (entry->pattern) + 2;
437 dot_pat = xmalloc (len);
439 memcpy (dot_pat + 1, entry->pattern, len - 1);
440 dot_entry->pattern = dot_pat;
445 /* Avoid processing the fake stub_file in vercheck, stat_needed and
446 check_needed routines. */
448 static void (*real_func) (lang_input_statement_type *);
450 static void ppc_for_each_input_file_wrapper (lang_input_statement_type *l)
457 ppc_lang_for_each_input_file (void (*func) (lang_input_statement_type *))
460 lang_for_each_input_file (&ppc_for_each_input_file_wrapper);
463 #define lang_for_each_input_file ppc_lang_for_each_input_file
467 if grep -q 'ld_elf32_spu_emulation' ldemul-list.h; then
469 /* Special handling for embedded SPU executables. */
470 extern bfd_boolean embedded_spu_file (lang_input_statement_type *, const char *);
471 static bfd_boolean gld${EMULATION_NAME}_load_symbols (lang_input_statement_type *);
474 ppc64_recognized_file (lang_input_statement_type *entry)
476 if (embedded_spu_file (entry, "-m64"))
479 return gld${EMULATION_NAME}_load_symbols (entry);
482 LDEMUL_RECOGNIZED_FILE=ppc64_recognized_file
485 # Define some shell vars to insert bits of code into the standard elf
486 # parse_args and list_options functions.
488 PARSE_AND_LIST_PROLOGUE='
489 #define OPTION_STUBGROUP_SIZE 301
490 #define OPTION_STUBSYMS (OPTION_STUBGROUP_SIZE + 1)
491 #define OPTION_NO_STUBSYMS (OPTION_STUBSYMS + 1)
492 #define OPTION_DOTSYMS (OPTION_NO_STUBSYMS + 1)
493 #define OPTION_NO_DOTSYMS (OPTION_DOTSYMS + 1)
494 #define OPTION_NO_TLS_OPT (OPTION_NO_DOTSYMS + 1)
495 #define OPTION_NO_TLS_GET_ADDR_OPT (OPTION_NO_TLS_OPT + 1)
496 #define OPTION_NO_OPD_OPT (OPTION_NO_TLS_GET_ADDR_OPT + 1)
497 #define OPTION_NO_TOC_OPT (OPTION_NO_OPD_OPT + 1)
498 #define OPTION_NO_MULTI_TOC (OPTION_NO_TOC_OPT + 1)
499 #define OPTION_NON_OVERLAPPING_OPD (OPTION_NO_MULTI_TOC + 1)
502 PARSE_AND_LIST_LONGOPTS='
503 { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
504 { "emit-stub-syms", no_argument, NULL, OPTION_STUBSYMS },
505 { "no-emit-stub-syms", no_argument, NULL, OPTION_NO_STUBSYMS },
506 { "dotsyms", no_argument, NULL, OPTION_DOTSYMS },
507 { "no-dotsyms", no_argument, NULL, OPTION_NO_DOTSYMS },
508 { "no-tls-optimize", no_argument, NULL, OPTION_NO_TLS_OPT },
509 { "no-tls-get-addr-optimize", no_argument, NULL, OPTION_NO_TLS_GET_ADDR_OPT },
510 { "no-opd-optimize", no_argument, NULL, OPTION_NO_OPD_OPT },
511 { "no-toc-optimize", no_argument, NULL, OPTION_NO_TOC_OPT },
512 { "no-multi-toc", no_argument, NULL, OPTION_NO_MULTI_TOC },
513 { "non-overlapping-opd", no_argument, NULL, OPTION_NON_OVERLAPPING_OPD },
516 PARSE_AND_LIST_OPTIONS='
518 --stub-group-size=N Maximum size of a group of input sections that\n\
519 can be handled by one stub section. A negative\n\
520 value locates all stubs before their branches\n\
521 (with a group size of -N), while a positive\n\
522 value allows two groups of input sections, one\n\
523 before, and one after each stub section.\n\
524 Values of +/-1 indicate the linker should\n\
525 choose suitable defaults.\n"
528 --emit-stub-syms Label linker stubs with a symbol.\n"
531 --no-emit-stub-syms Don'\''t label linker stubs with a symbol.\n"
534 --dotsyms For every version pattern \"foo\" in a version\n\
535 script, add \".foo\" so that function code\n\
536 symbols are treated the same as function\n\
537 descriptor symbols. Defaults to on.\n"
540 --no-dotsyms Don'\''t do anything special in version scripts.\n"
543 --no-tls-optimize Don'\''t try to optimize TLS accesses.\n"
546 --no-tls-get-addr-optimize Don'\''t use a special __tls_get_addr call.\n"
549 --no-opd-optimize Don'\''t optimize the OPD section.\n"
552 --no-toc-optimize Don'\''t optimize the TOC section.\n"
555 --no-multi-toc Disallow automatic multiple toc sections.\n"
558 --non-overlapping-opd Canonicalize .opd, so that there are no\n\
559 overlapping .opd entries.\n"
563 PARSE_AND_LIST_ARGS_CASES='
564 case OPTION_STUBGROUP_SIZE:
567 group_size = bfd_scan_vma (optarg, &end, 0);
569 einfo (_("%P%F: invalid number `%s'\''\n"), optarg);
573 case OPTION_STUBSYMS:
577 case OPTION_NO_STUBSYMS:
585 case OPTION_NO_DOTSYMS:
589 case OPTION_NO_TLS_OPT:
593 case OPTION_NO_TLS_GET_ADDR_OPT:
594 no_tls_get_addr_opt = 1;
597 case OPTION_NO_OPD_OPT:
601 case OPTION_NO_TOC_OPT:
605 case OPTION_NO_MULTI_TOC:
609 case OPTION_NON_OVERLAPPING_OPD:
610 non_overlapping_opd = 1;
614 # Put these extra ppc64elf routines in ld_${EMULATION_NAME}_emulation
616 LDEMUL_BEFORE_ALLOCATION=ppc_before_allocation
617 LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
618 LDEMUL_FINISH=gld${EMULATION_NAME}_finish
619 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=ppc_create_output_section_statements
620 LDEMUL_NEW_VERS_PATTERN=gld${EMULATION_NAME}_new_vers_pattern