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_DATA))
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, non_overlapping_opd))
107 einfo ("%X%P: can not edit %s %E\n", "opd");
109 if (ppc64_elf_tls_setup (&link_info, no_tls_get_addr_opt, &no_multi_toc)
112 /* Size the sections. This is premature, but we want to know the
113 TLS segment layout so that certain optimizations can be done. */
114 expld.phase = lang_mark_phase_enum;
115 expld.dataseg.phase = exp_dataseg_none;
116 one_lang_size_sections_pass (NULL, TRUE);
118 if (!ppc64_elf_tls_optimize (&link_info))
119 einfo ("%X%P: TLS problem %E\n");
121 /* We must not cache anything from the preliminary sizing. */
122 lang_reset_memory_regions ();
126 && !link_info.relocatable
127 && !ppc64_elf_edit_toc (&link_info))
128 einfo ("%X%P: can not edit %s %E\n", "toc");
131 gld${EMULATION_NAME}_before_allocation ();
134 struct hook_stub_info
136 lang_statement_list_type add;
137 asection *input_section;
140 /* Traverse the linker tree to find the spot where the stub goes. */
143 hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp)
145 lang_statement_union_type *l;
148 for (; (l = *lp) != NULL; lp = &l->header.next)
150 switch (l->header.type)
152 case lang_constructors_statement_enum:
153 ret = hook_in_stub (info, &constructor_list.head);
158 case lang_output_section_statement_enum:
159 ret = hook_in_stub (info,
160 &l->output_section_statement.children.head);
165 case lang_wild_statement_enum:
166 ret = hook_in_stub (info, &l->wild_statement.children.head);
171 case lang_group_statement_enum:
172 ret = hook_in_stub (info, &l->group_statement.children.head);
177 case lang_input_section_enum:
178 if (l->input_section.section == info->input_section)
180 /* We've found our section. Insert the stub immediately
181 before its associated input section. */
182 *lp = info->add.head;
183 *(info->add.tail) = l;
188 case lang_data_statement_enum:
189 case lang_reloc_statement_enum:
190 case lang_object_symbols_statement_enum:
191 case lang_output_statement_enum:
192 case lang_target_statement_enum:
193 case lang_input_statement_enum:
194 case lang_assignment_statement_enum:
195 case lang_padding_statement_enum:
196 case lang_address_statement_enum:
197 case lang_fill_statement_enum:
209 /* Call-back for ppc64_elf_size_stubs. */
211 /* Create a new stub section, and arrange for it to be linked
212 immediately before INPUT_SECTION. */
215 ppc_add_stub_section (const char *stub_sec_name, asection *input_section)
219 asection *output_section;
221 lang_output_section_statement_type *os;
222 struct hook_stub_info info;
224 flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
225 | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_KEEP);
226 stub_sec = bfd_make_section_anyway_with_flags (stub_file->the_bfd,
227 stub_sec_name, flags);
228 if (stub_sec == NULL)
231 output_section = input_section->output_section;
232 secname = bfd_get_section_name (output_section->owner, output_section);
233 os = lang_output_section_find (secname);
235 info.input_section = input_section;
236 lang_list_init (&info.add);
237 lang_add_section (&info.add, stub_sec, os);
239 if (info.add.head == NULL)
243 if (hook_in_stub (&info, &os->children.head))
247 einfo ("%X%P: can not make stub section: %E\n");
252 /* Another call-back for ppc64_elf_size_stubs. */
255 ppc_layout_sections_again (void)
257 /* If we have changed sizes of the stub sections, then we need
258 to recalculate all the section offsets. This may mean we need to
259 add even more stubs. */
260 gld${EMULATION_NAME}_map_segments (TRUE);
262 if (!link_info.relocatable)
263 _bfd_set_gp_value (link_info.output_bfd,
264 ppc64_elf_toc (link_info.output_bfd));
266 need_laying_out = -1;
271 build_toc_list (lang_statement_union_type *statement)
273 if (statement->header.type == lang_input_section_enum)
275 asection *i = statement->input_section.section;
277 if (!((lang_input_statement_type *) i->owner->usrdata)->just_syms_flag
278 && (i->flags & SEC_EXCLUDE) == 0
279 && i->output_section == toc_section)
281 if (!ppc64_elf_next_toc_section (&link_info, i))
282 einfo ("%X%P: linker script separates .got and .toc\n");
289 build_section_lists (lang_statement_union_type *statement)
291 if (statement->header.type == lang_input_section_enum)
293 asection *i = statement->input_section.section;
295 if (!((lang_input_statement_type *) i->owner->usrdata)->just_syms_flag
296 && (i->flags & SEC_EXCLUDE) == 0
297 && i->output_section != NULL
298 && i->output_section->owner == link_info.output_bfd)
300 if (!ppc64_elf_next_input_section (&link_info, i))
301 einfo ("%X%P: can not size stub section: %E\n");
307 /* Call the back-end function to set TOC base after we have placed all
310 gld${EMULATION_NAME}_after_allocation (void)
312 /* bfd_elf_discard_info just plays with data and debugging sections,
313 ie. doesn't affect code size, so we can delay resizing the
314 sections. It's likely we'll resize everything in the process of
316 if (bfd_elf_discard_info (link_info.output_bfd, &link_info))
319 /* If generating a relocatable output file, then we don't have any
321 if (stub_file != NULL && !link_info.relocatable)
323 int ret = ppc64_elf_setup_section_lists (&link_info,
324 &ppc_add_stub_section,
325 &ppc_layout_sections_again);
327 einfo ("%X%P: can not size stub section: %E\n");
330 ppc64_elf_start_multitoc_partition (&link_info);
334 toc_section = bfd_get_section_by_name (link_info.output_bfd,
336 if (toc_section != NULL)
337 lang_for_each_statement (build_toc_list);
340 if (ppc64_elf_layout_multitoc (&link_info)
342 && toc_section != NULL)
343 lang_for_each_statement (build_toc_list);
345 ppc64_elf_finish_multitoc_partition (&link_info);
347 lang_for_each_statement (build_section_lists);
349 /* Call into the BFD backend to do the real work. */
350 if (!ppc64_elf_size_stubs (&link_info, group_size))
351 einfo ("%X%P: can not size stub section: %E\n");
355 if (need_laying_out != -1)
357 gld${EMULATION_NAME}_map_segments (need_laying_out);
359 if (!link_info.relocatable)
360 _bfd_set_gp_value (link_info.output_bfd,
361 ppc64_elf_toc (link_info.output_bfd));
366 /* Final emulation specific call. */
369 gld${EMULATION_NAME}_finish (void)
371 /* e_entry on PowerPC64 points to the function descriptor for
372 _start. If _start is missing, default to the first function
373 descriptor in the .opd section. */
374 entry_section = ".opd";
376 if (link_info.relocatable)
378 asection *toc = bfd_get_section_by_name (link_info.output_bfd, ".toc");
380 && bfd_section_size (link_info.output_bfd, toc) > 0x10000)
381 einfo ("%X%P: TOC section size exceeds 64k\n");
387 char *line, *endline;
389 if (emit_stub_syms < 0)
391 if (!ppc64_elf_build_stubs (emit_stub_syms, &link_info,
392 config.stats ? &msg : NULL))
393 einfo ("%X%P: can not build stubs: %E\n");
395 for (line = msg; line != NULL; line = endline)
397 endline = strchr (line, '\n');
400 fprintf (stderr, "%s: %s\n", program_name, line);
406 ppc64_elf_restore_symbols (&link_info);
411 /* Add a pattern matching ".foo" for every "foo" in a version script.
413 The reason for doing this is that many shared library version
414 scripts export a selected set of functions or data symbols, forcing
419 . this; that; some; thing;
424 To make the above work for PowerPC64, we need to export ".this",
425 ".that" and so on, otherwise only the function descriptor syms are
426 exported. Lack of an exported function code sym may cause a
427 definition to be pulled in from a static library. */
429 static struct bfd_elf_version_expr *
430 gld${EMULATION_NAME}_new_vers_pattern (struct bfd_elf_version_expr *entry)
432 struct bfd_elf_version_expr *dot_entry;
437 || entry->pattern[0] == '.'
438 || (!entry->literal && entry->pattern[0] == '*'))
441 dot_entry = xmalloc (sizeof *dot_entry);
443 dot_entry->next = entry;
444 len = strlen (entry->pattern) + 2;
445 dot_pat = xmalloc (len);
447 memcpy (dot_pat + 1, entry->pattern, len - 1);
448 dot_entry->pattern = dot_pat;
453 /* Avoid processing the fake stub_file in vercheck, stat_needed and
454 check_needed routines. */
456 static void (*real_func) (lang_input_statement_type *);
458 static void ppc_for_each_input_file_wrapper (lang_input_statement_type *l)
465 ppc_lang_for_each_input_file (void (*func) (lang_input_statement_type *))
468 lang_for_each_input_file (&ppc_for_each_input_file_wrapper);
471 #define lang_for_each_input_file ppc_lang_for_each_input_file
475 if grep -q 'ld_elf32_spu_emulation' ldemul-list.h; then
477 /* Special handling for embedded SPU executables. */
478 extern bfd_boolean embedded_spu_file (lang_input_statement_type *, const char *);
479 static bfd_boolean gld${EMULATION_NAME}_load_symbols (lang_input_statement_type *);
482 ppc64_recognized_file (lang_input_statement_type *entry)
484 if (embedded_spu_file (entry, "-m64"))
487 return gld${EMULATION_NAME}_load_symbols (entry);
490 LDEMUL_RECOGNIZED_FILE=ppc64_recognized_file
493 # Define some shell vars to insert bits of code into the standard elf
494 # parse_args and list_options functions.
496 PARSE_AND_LIST_PROLOGUE='
497 #define OPTION_STUBGROUP_SIZE 301
498 #define OPTION_STUBSYMS (OPTION_STUBGROUP_SIZE + 1)
499 #define OPTION_NO_STUBSYMS (OPTION_STUBSYMS + 1)
500 #define OPTION_DOTSYMS (OPTION_NO_STUBSYMS + 1)
501 #define OPTION_NO_DOTSYMS (OPTION_DOTSYMS + 1)
502 #define OPTION_NO_TLS_OPT (OPTION_NO_DOTSYMS + 1)
503 #define OPTION_NO_TLS_GET_ADDR_OPT (OPTION_NO_TLS_OPT + 1)
504 #define OPTION_NO_OPD_OPT (OPTION_NO_TLS_GET_ADDR_OPT + 1)
505 #define OPTION_NO_TOC_OPT (OPTION_NO_OPD_OPT + 1)
506 #define OPTION_NO_MULTI_TOC (OPTION_NO_TOC_OPT + 1)
507 #define OPTION_NON_OVERLAPPING_OPD (OPTION_NO_MULTI_TOC + 1)
510 PARSE_AND_LIST_LONGOPTS='
511 { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
512 { "emit-stub-syms", no_argument, NULL, OPTION_STUBSYMS },
513 { "no-emit-stub-syms", no_argument, NULL, OPTION_NO_STUBSYMS },
514 { "dotsyms", no_argument, NULL, OPTION_DOTSYMS },
515 { "no-dotsyms", no_argument, NULL, OPTION_NO_DOTSYMS },
516 { "no-tls-optimize", no_argument, NULL, OPTION_NO_TLS_OPT },
517 { "no-tls-get-addr-optimize", no_argument, NULL, OPTION_NO_TLS_GET_ADDR_OPT },
518 { "no-opd-optimize", no_argument, NULL, OPTION_NO_OPD_OPT },
519 { "no-toc-optimize", no_argument, NULL, OPTION_NO_TOC_OPT },
520 { "no-multi-toc", no_argument, NULL, OPTION_NO_MULTI_TOC },
521 { "non-overlapping-opd", no_argument, NULL, OPTION_NON_OVERLAPPING_OPD },
524 PARSE_AND_LIST_OPTIONS='
526 --stub-group-size=N Maximum size of a group of input sections that\n\
527 can be handled by one stub section. A negative\n\
528 value locates all stubs before their branches\n\
529 (with a group size of -N), while a positive\n\
530 value allows two groups of input sections, one\n\
531 before, and one after each stub section.\n\
532 Values of +/-1 indicate the linker should\n\
533 choose suitable defaults.\n"
536 --emit-stub-syms Label linker stubs with a symbol.\n"
539 --no-emit-stub-syms Don'\''t label linker stubs with a symbol.\n"
542 --dotsyms For every version pattern \"foo\" in a version\n\
543 script, add \".foo\" so that function code\n\
544 symbols are treated the same as function\n\
545 descriptor symbols. Defaults to on.\n"
548 --no-dotsyms Don'\''t do anything special in version scripts.\n"
551 --no-tls-optimize Don'\''t try to optimize TLS accesses.\n"
554 --no-tls-get-addr-optimize Don'\''t use a special __tls_get_addr call.\n"
557 --no-opd-optimize Don'\''t optimize the OPD section.\n"
560 --no-toc-optimize Don'\''t optimize the TOC section.\n"
563 --no-multi-toc Disallow automatic multiple toc sections.\n"
566 --non-overlapping-opd Canonicalize .opd, so that there are no\n\
567 overlapping .opd entries.\n"
571 PARSE_AND_LIST_ARGS_CASES='
572 case OPTION_STUBGROUP_SIZE:
575 group_size = bfd_scan_vma (optarg, &end, 0);
577 einfo (_("%P%F: invalid number `%s'\''\n"), optarg);
581 case OPTION_STUBSYMS:
585 case OPTION_NO_STUBSYMS:
593 case OPTION_NO_DOTSYMS:
597 case OPTION_NO_TLS_OPT:
601 case OPTION_NO_TLS_GET_ADDR_OPT:
602 no_tls_get_addr_opt = 1;
605 case OPTION_NO_OPD_OPT:
609 case OPTION_NO_TOC_OPT:
613 case OPTION_NO_MULTI_TOC:
617 case OPTION_NON_OVERLAPPING_OPD:
618 non_overlapping_opd = 1;
622 # Put these extra ppc64elf routines in ld_${EMULATION_NAME}_emulation
624 LDEMUL_BEFORE_ALLOCATION=ppc_before_allocation
625 LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
626 LDEMUL_FINISH=gld${EMULATION_NAME}_finish
627 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=ppc_create_output_section_statements
628 LDEMUL_NEW_VERS_PATTERN=gld${EMULATION_NAME}_new_vers_pattern