1 # This shell script emits a C file. -*- C -*-
2 # Copyright 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
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 sort input toc and got sections. */
62 static int no_toc_sort = 0;
64 /* Whether to emit symbols for stubs. */
65 static int emit_stub_syms = -1;
67 static asection *toc_section = 0;
69 /* Whether to canonicalize .opd so that there are no overlapping
71 static int non_overlapping_opd = 0;
73 /* This is called before the input files are opened. We create a new
74 fake input file to hold the stub sections. */
77 ppc_create_output_section_statements (void)
79 if (!(bfd_get_flavour (link_info.output_bfd) == bfd_target_elf_flavour
80 && elf_object_id (link_info.output_bfd) == PPC64_ELF_DATA))
83 link_info.wrap_char = '.';
85 stub_file = lang_add_input_file ("linker stubs",
86 lang_input_file_is_fake_enum,
88 stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd);
89 if (stub_file->the_bfd == NULL
90 || !bfd_set_arch_mach (stub_file->the_bfd,
91 bfd_get_arch (link_info.output_bfd),
92 bfd_get_mach (link_info.output_bfd)))
94 einfo ("%F%P: can not create BFD %E\n");
98 stub_file->the_bfd->flags |= BFD_LINKER_CREATED;
99 ldlang_add_file (stub_file);
100 ppc64_elf_init_stub_bfd (stub_file->the_bfd, &link_info);
103 /* Move the input section statement at *U which happens to be on LIST
104 to be just before *TO. */
107 move_input_section (lang_statement_list_type *list,
108 lang_statement_union_type **u,
109 lang_statement_union_type **to)
111 lang_statement_union_type *s = *u;
112 asection *i = s->input_section.section;
115 /* Snip the input section from the statement list. If it was the
116 last statement, fix the list tail pointer. */
120 /* Add it back in the new position. */
121 s->header.next = *to;
123 if (list->tail == to)
124 list->tail = &s->header.next;
126 /* Trim I off the bfd map_head/map_tail doubly linked lists. */
129 (p != NULL ? p : i->output_section)->map_head.s = n;
130 (n != NULL ? n : i->output_section)->map_tail.s = p;
132 /* Add I back on in its new position. */
133 if (s->header.next->header.type == lang_input_section_enum)
135 n = s->header.next->input_section.section;
140 /* If the next statement is not an input section statement then
141 TO must point at the previous input section statement
142 header.next field. */
143 lang_input_section_type *prev = (lang_input_section_type *)
144 ((char *) to - offsetof (lang_statement_union_type, header.next));
146 ASSERT (prev->header.type == lang_input_section_enum);
152 (p != NULL ? p : i->output_section)->map_head.s = i;
153 (n != NULL ? n : i->output_section)->map_tail.s = i;
156 /* Sort input section statements in the linker script tree rooted at
157 LIST so that those whose owning bfd happens to have a section
158 called .init or .fini are placed first. Place any TOC sections
159 referenced by small TOC relocs next, with TOC sections referenced
160 only by bigtoc relocs last. */
163 sort_toc_sections (lang_statement_list_type *list,
164 lang_statement_union_type **ini,
165 lang_statement_union_type **small)
167 lang_statement_union_type *s, **u;
171 while ((s = *u) != NULL)
173 switch (s->header.type)
175 case lang_wild_statement_enum:
176 sort_toc_sections (&s->wild_statement.children, ini, small);
179 case lang_group_statement_enum:
180 sort_toc_sections (&s->group_statement.children, ini, small);
183 case lang_input_section_enum:
184 i = s->input_section.section;
185 /* Leave the stub_file .got where it is. We put the .got
187 if (i->owner == stub_file->the_bfd)
189 if (bfd_get_section_by_name (i->owner, ".init") != NULL
190 || bfd_get_section_by_name (i->owner, ".fini") != NULL)
192 if (ini != NULL && *ini != s)
194 move_input_section (list, u, ini);
196 small = &s->header.next;
197 ini = &s->header.next;
201 small = &s->header.next;
202 ini = &s->header.next;
205 else if (ini == NULL)
208 if (ppc64_elf_has_small_toc_reloc (i))
210 if (small != NULL && *small != s)
212 move_input_section (list, u, small);
213 small = &s->header.next;
216 small = &s->header.next;
218 else if (small == NULL)
230 prelim_size_sections (void)
232 if (expld.phase != lang_mark_phase_enum)
234 expld.phase = lang_mark_phase_enum;
235 expld.dataseg.phase = exp_dataseg_none;
236 one_lang_size_sections_pass (NULL, FALSE);
237 /* We must not cache anything from the preliminary sizing. */
238 lang_reset_memory_regions ();
243 ppc_before_allocation (void)
245 if (stub_file != NULL)
248 && !ppc64_elf_edit_opd (&link_info, non_overlapping_opd))
249 einfo ("%X%P: can not edit %s %E\n", "opd");
251 if (ppc64_elf_tls_setup (&link_info, no_tls_get_addr_opt, &no_multi_toc)
254 /* Size the sections. This is premature, but we want to know the
255 TLS segment layout so that certain optimizations can be done. */
256 prelim_size_sections ();
258 if (!ppc64_elf_tls_optimize (&link_info))
259 einfo ("%X%P: TLS problem %E\n");
263 && !link_info.relocatable)
265 prelim_size_sections ();
267 if (!ppc64_elf_edit_toc (&link_info))
268 einfo ("%X%P: can not edit %s %E\n", "toc");
273 lang_output_section_statement_type *toc_os;
275 toc_os = lang_output_section_find (".got");
277 sort_toc_sections (&toc_os->children, NULL, NULL);
281 gld${EMULATION_NAME}_before_allocation ();
284 struct hook_stub_info
286 lang_statement_list_type add;
287 asection *input_section;
290 /* Traverse the linker tree to find the spot where the stub goes. */
293 hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp)
295 lang_statement_union_type *l;
298 for (; (l = *lp) != NULL; lp = &l->header.next)
300 switch (l->header.type)
302 case lang_constructors_statement_enum:
303 ret = hook_in_stub (info, &constructor_list.head);
308 case lang_output_section_statement_enum:
309 ret = hook_in_stub (info,
310 &l->output_section_statement.children.head);
315 case lang_wild_statement_enum:
316 ret = hook_in_stub (info, &l->wild_statement.children.head);
321 case lang_group_statement_enum:
322 ret = hook_in_stub (info, &l->group_statement.children.head);
327 case lang_input_section_enum:
328 if (l->input_section.section == info->input_section)
330 /* We've found our section. Insert the stub immediately
331 before its associated input section. */
332 *lp = info->add.head;
333 *(info->add.tail) = l;
338 case lang_data_statement_enum:
339 case lang_reloc_statement_enum:
340 case lang_object_symbols_statement_enum:
341 case lang_output_statement_enum:
342 case lang_target_statement_enum:
343 case lang_input_statement_enum:
344 case lang_assignment_statement_enum:
345 case lang_padding_statement_enum:
346 case lang_address_statement_enum:
347 case lang_fill_statement_enum:
359 /* Call-back for ppc64_elf_size_stubs. */
361 /* Create a new stub section, and arrange for it to be linked
362 immediately before INPUT_SECTION. */
365 ppc_add_stub_section (const char *stub_sec_name, asection *input_section)
369 asection *output_section;
371 lang_output_section_statement_type *os;
372 struct hook_stub_info info;
374 flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
375 | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_KEEP);
376 stub_sec = bfd_make_section_anyway_with_flags (stub_file->the_bfd,
377 stub_sec_name, flags);
378 if (stub_sec == NULL)
381 output_section = input_section->output_section;
382 secname = bfd_get_section_name (output_section->owner, output_section);
383 os = lang_output_section_find (secname);
385 info.input_section = input_section;
386 lang_list_init (&info.add);
387 lang_add_section (&info.add, stub_sec, os);
389 if (info.add.head == NULL)
393 if (hook_in_stub (&info, &os->children.head))
397 einfo ("%X%P: can not make stub section: %E\n");
402 /* Another call-back for ppc64_elf_size_stubs. */
405 ppc_layout_sections_again (void)
407 /* If we have changed sizes of the stub sections, then we need
408 to recalculate all the section offsets. This may mean we need to
409 add even more stubs. */
410 gld${EMULATION_NAME}_map_segments (TRUE);
412 if (!link_info.relocatable)
413 _bfd_set_gp_value (link_info.output_bfd,
414 ppc64_elf_toc (link_info.output_bfd));
416 need_laying_out = -1;
421 build_toc_list (lang_statement_union_type *statement)
423 if (statement->header.type == lang_input_section_enum)
425 asection *i = statement->input_section.section;
427 if (!((lang_input_statement_type *) i->owner->usrdata)->just_syms_flag
428 && (i->flags & SEC_EXCLUDE) == 0
429 && i->output_section == toc_section)
431 if (!ppc64_elf_next_toc_section (&link_info, i))
432 einfo ("%X%P: linker script separates .got and .toc\n");
439 build_section_lists (lang_statement_union_type *statement)
441 if (statement->header.type == lang_input_section_enum)
443 asection *i = statement->input_section.section;
445 if (!((lang_input_statement_type *) i->owner->usrdata)->just_syms_flag
446 && (i->flags & SEC_EXCLUDE) == 0
447 && i->output_section != NULL
448 && i->output_section->owner == link_info.output_bfd)
450 if (!ppc64_elf_next_input_section (&link_info, i))
451 einfo ("%X%P: can not size stub section: %E\n");
457 /* Call the back-end function to set TOC base after we have placed all
460 gld${EMULATION_NAME}_after_allocation (void)
462 /* bfd_elf_discard_info just plays with data and debugging sections,
463 ie. doesn't affect code size, so we can delay resizing the
464 sections. It's likely we'll resize everything in the process of
466 if (bfd_elf_discard_info (link_info.output_bfd, &link_info))
469 /* If generating a relocatable output file, then we don't have any
471 if (stub_file != NULL && !link_info.relocatable)
473 int ret = ppc64_elf_setup_section_lists (&link_info,
474 &ppc_add_stub_section,
475 &ppc_layout_sections_again);
477 einfo ("%X%P: can not size stub section: %E\n");
480 ppc64_elf_start_multitoc_partition (&link_info);
484 toc_section = bfd_get_section_by_name (link_info.output_bfd,
486 if (toc_section != NULL)
487 lang_for_each_statement (build_toc_list);
490 if (ppc64_elf_layout_multitoc (&link_info)
492 && toc_section != NULL)
493 lang_for_each_statement (build_toc_list);
495 ppc64_elf_finish_multitoc_partition (&link_info);
497 lang_for_each_statement (build_section_lists);
499 if (!ppc64_elf_check_init_fini (&link_info))
500 einfo ("%P: .init/.fini fragments use differing TOC pointers\n");
502 /* Call into the BFD backend to do the real work. */
503 if (!ppc64_elf_size_stubs (&link_info, group_size))
504 einfo ("%X%P: can not size stub section: %E\n");
508 if (need_laying_out != -1)
510 gld${EMULATION_NAME}_map_segments (need_laying_out);
512 if (!link_info.relocatable)
513 _bfd_set_gp_value (link_info.output_bfd,
514 ppc64_elf_toc (link_info.output_bfd));
519 /* Final emulation specific call. */
522 gld${EMULATION_NAME}_finish (void)
524 /* e_entry on PowerPC64 points to the function descriptor for
525 _start. If _start is missing, default to the first function
526 descriptor in the .opd section. */
527 entry_section = ".opd";
529 if (link_info.relocatable)
531 asection *toc = bfd_get_section_by_name (link_info.output_bfd, ".toc");
533 && bfd_section_size (link_info.output_bfd, toc) > 0x10000)
534 einfo ("%X%P: TOC section size exceeds 64k\n");
540 char *line, *endline;
542 if (emit_stub_syms < 0)
544 if (!ppc64_elf_build_stubs (emit_stub_syms, &link_info,
545 config.stats ? &msg : NULL))
546 einfo ("%X%P: can not build stubs: %E\n");
549 for (line = msg; line != NULL; line = endline)
551 endline = strchr (line, '\n');
554 fprintf (stderr, "%s: %s\n", program_name, line);
561 ppc64_elf_restore_symbols (&link_info);
566 /* Add a pattern matching ".foo" for every "foo" in a version script.
568 The reason for doing this is that many shared library version
569 scripts export a selected set of functions or data symbols, forcing
574 . this; that; some; thing;
579 To make the above work for PowerPC64, we need to export ".this",
580 ".that" and so on, otherwise only the function descriptor syms are
581 exported. Lack of an exported function code sym may cause a
582 definition to be pulled in from a static library. */
584 static struct bfd_elf_version_expr *
585 gld${EMULATION_NAME}_new_vers_pattern (struct bfd_elf_version_expr *entry)
587 struct bfd_elf_version_expr *dot_entry;
592 || entry->pattern[0] == '.'
593 || (!entry->literal && entry->pattern[0] == '*'))
596 dot_entry = xmalloc (sizeof *dot_entry);
598 dot_entry->next = entry;
599 len = strlen (entry->pattern) + 2;
600 dot_pat = xmalloc (len);
602 memcpy (dot_pat + 1, entry->pattern, len - 1);
603 dot_entry->pattern = dot_pat;
604 dot_entry->script = 1;
609 /* Avoid processing the fake stub_file in vercheck, stat_needed and
610 check_needed routines. */
612 static void (*real_func) (lang_input_statement_type *);
614 static void ppc_for_each_input_file_wrapper (lang_input_statement_type *l)
621 ppc_lang_for_each_input_file (void (*func) (lang_input_statement_type *))
624 lang_for_each_input_file (&ppc_for_each_input_file_wrapper);
627 #define lang_for_each_input_file ppc_lang_for_each_input_file
631 if grep -q 'ld_elf32_spu_emulation' ldemul-list.h; then
633 /* Special handling for embedded SPU executables. */
634 extern bfd_boolean embedded_spu_file (lang_input_statement_type *, const char *);
635 static bfd_boolean gld${EMULATION_NAME}_load_symbols (lang_input_statement_type *);
638 ppc64_recognized_file (lang_input_statement_type *entry)
640 if (embedded_spu_file (entry, "-m64"))
643 return gld${EMULATION_NAME}_load_symbols (entry);
646 LDEMUL_RECOGNIZED_FILE=ppc64_recognized_file
649 # Define some shell vars to insert bits of code into the standard elf
650 # parse_args and list_options functions.
652 PARSE_AND_LIST_PROLOGUE='
653 #define OPTION_STUBGROUP_SIZE 301
654 #define OPTION_STUBSYMS (OPTION_STUBGROUP_SIZE + 1)
655 #define OPTION_NO_STUBSYMS (OPTION_STUBSYMS + 1)
656 #define OPTION_DOTSYMS (OPTION_NO_STUBSYMS + 1)
657 #define OPTION_NO_DOTSYMS (OPTION_DOTSYMS + 1)
658 #define OPTION_NO_TLS_OPT (OPTION_NO_DOTSYMS + 1)
659 #define OPTION_NO_TLS_GET_ADDR_OPT (OPTION_NO_TLS_OPT + 1)
660 #define OPTION_NO_OPD_OPT (OPTION_NO_TLS_GET_ADDR_OPT + 1)
661 #define OPTION_NO_TOC_OPT (OPTION_NO_OPD_OPT + 1)
662 #define OPTION_NO_MULTI_TOC (OPTION_NO_TOC_OPT + 1)
663 #define OPTION_NO_TOC_SORT (OPTION_NO_MULTI_TOC + 1)
664 #define OPTION_NON_OVERLAPPING_OPD (OPTION_NO_TOC_SORT + 1)
667 PARSE_AND_LIST_LONGOPTS='
668 { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
669 { "emit-stub-syms", no_argument, NULL, OPTION_STUBSYMS },
670 { "no-emit-stub-syms", no_argument, NULL, OPTION_NO_STUBSYMS },
671 { "dotsyms", no_argument, NULL, OPTION_DOTSYMS },
672 { "no-dotsyms", no_argument, NULL, OPTION_NO_DOTSYMS },
673 { "no-tls-optimize", no_argument, NULL, OPTION_NO_TLS_OPT },
674 { "no-tls-get-addr-optimize", no_argument, NULL, OPTION_NO_TLS_GET_ADDR_OPT },
675 { "no-opd-optimize", no_argument, NULL, OPTION_NO_OPD_OPT },
676 { "no-toc-optimize", no_argument, NULL, OPTION_NO_TOC_OPT },
677 { "no-multi-toc", no_argument, NULL, OPTION_NO_MULTI_TOC },
678 { "no-toc-sort", no_argument, NULL, OPTION_NO_TOC_SORT },
679 { "non-overlapping-opd", no_argument, NULL, OPTION_NON_OVERLAPPING_OPD },
682 PARSE_AND_LIST_OPTIONS='
684 --stub-group-size=N Maximum size of a group of input sections that\n\
685 can be handled by one stub section. A negative\n\
686 value locates all stubs before their branches\n\
687 (with a group size of -N), while a positive\n\
688 value allows two groups of input sections, one\n\
689 before, and one after each stub section.\n\
690 Values of +/-1 indicate the linker should\n\
691 choose suitable defaults.\n"
694 --emit-stub-syms Label linker stubs with a symbol.\n"
697 --no-emit-stub-syms Don'\''t label linker stubs with a symbol.\n"
700 --dotsyms For every version pattern \"foo\" in a version\n\
701 script, add \".foo\" so that function code\n\
702 symbols are treated the same as function\n\
703 descriptor symbols. Defaults to on.\n"
706 --no-dotsyms Don'\''t do anything special in version scripts.\n"
709 --no-tls-optimize Don'\''t try to optimize TLS accesses.\n"
712 --no-tls-get-addr-optimize Don'\''t use a special __tls_get_addr call.\n"
715 --no-opd-optimize Don'\''t optimize the OPD section.\n"
718 --no-toc-optimize Don'\''t optimize the TOC section.\n"
721 --no-multi-toc Disallow automatic multiple toc sections.\n"
724 --no-toc-sort Don'\''t sort TOC and GOT sections.\n"
727 --non-overlapping-opd Canonicalize .opd, so that there are no\n\
728 overlapping .opd entries.\n"
732 PARSE_AND_LIST_ARGS_CASES='
733 case OPTION_STUBGROUP_SIZE:
736 group_size = bfd_scan_vma (optarg, &end, 0);
738 einfo (_("%P%F: invalid number `%s'\''\n"), optarg);
742 case OPTION_STUBSYMS:
746 case OPTION_NO_STUBSYMS:
754 case OPTION_NO_DOTSYMS:
758 case OPTION_NO_TLS_OPT:
762 case OPTION_NO_TLS_GET_ADDR_OPT:
763 no_tls_get_addr_opt = 1;
766 case OPTION_NO_OPD_OPT:
770 case OPTION_NO_TOC_OPT:
774 case OPTION_NO_MULTI_TOC:
778 case OPTION_NO_TOC_SORT:
782 case OPTION_NON_OVERLAPPING_OPD:
783 non_overlapping_opd = 1;
787 # Put these extra ppc64elf routines in ld_${EMULATION_NAME}_emulation
789 LDEMUL_BEFORE_ALLOCATION=ppc_before_allocation
790 LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
791 LDEMUL_FINISH=gld${EMULATION_NAME}_finish
792 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=ppc_create_output_section_statements
793 LDEMUL_NEW_VERS_PATTERN=gld${EMULATION_NAME}_new_vers_pattern