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 /* Set if PLT call stubs should load r11. */
65 static int plt_static_chain = 0;
67 /* Whether to emit symbols for stubs. */
68 static int emit_stub_syms = -1;
70 static asection *toc_section = 0;
72 /* Whether to canonicalize .opd so that there are no overlapping
74 static int non_overlapping_opd = 0;
76 /* This is called before the input files are opened. We create a new
77 fake input file to hold the stub sections. */
80 ppc_create_output_section_statements (void)
82 if (!(bfd_get_flavour (link_info.output_bfd) == bfd_target_elf_flavour
83 && elf_object_id (link_info.output_bfd) == PPC64_ELF_DATA))
86 link_info.wrap_char = '.';
88 stub_file = lang_add_input_file ("linker stubs",
89 lang_input_file_is_fake_enum,
91 stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd);
92 if (stub_file->the_bfd == NULL
93 || !bfd_set_arch_mach (stub_file->the_bfd,
94 bfd_get_arch (link_info.output_bfd),
95 bfd_get_mach (link_info.output_bfd)))
97 einfo ("%F%P: can not create BFD %E\n");
101 stub_file->the_bfd->flags |= BFD_LINKER_CREATED;
102 ldlang_add_file (stub_file);
103 ppc64_elf_init_stub_bfd (stub_file->the_bfd, &link_info);
106 /* Move the input section statement at *U which happens to be on LIST
107 to be just before *TO. */
110 move_input_section (lang_statement_list_type *list,
111 lang_statement_union_type **u,
112 lang_statement_union_type **to)
114 lang_statement_union_type *s = *u;
115 asection *i = s->input_section.section;
118 /* Snip the input section from the statement list. If it was the
119 last statement, fix the list tail pointer. */
123 /* Add it back in the new position. */
124 s->header.next = *to;
126 if (list->tail == to)
127 list->tail = &s->header.next;
129 /* Trim I off the bfd map_head/map_tail doubly linked lists. */
132 (p != NULL ? p : i->output_section)->map_head.s = n;
133 (n != NULL ? n : i->output_section)->map_tail.s = p;
135 /* Add I back on in its new position. */
136 if (s->header.next->header.type == lang_input_section_enum)
138 n = s->header.next->input_section.section;
143 /* If the next statement is not an input section statement then
144 TO must point at the previous input section statement
145 header.next field. */
146 lang_input_section_type *prev = (lang_input_section_type *)
147 ((char *) to - offsetof (lang_statement_union_type, header.next));
149 ASSERT (prev->header.type == lang_input_section_enum);
155 (p != NULL ? p : i->output_section)->map_head.s = i;
156 (n != NULL ? n : i->output_section)->map_tail.s = i;
159 /* Sort input section statements in the linker script tree rooted at
160 LIST so that those whose owning bfd happens to have a section
161 called .init or .fini are placed first. Place any TOC sections
162 referenced by small TOC relocs next, with TOC sections referenced
163 only by bigtoc relocs last. */
166 sort_toc_sections (lang_statement_list_type *list,
167 lang_statement_union_type **ini,
168 lang_statement_union_type **small)
170 lang_statement_union_type *s, **u;
174 while ((s = *u) != NULL)
176 switch (s->header.type)
178 case lang_wild_statement_enum:
179 sort_toc_sections (&s->wild_statement.children, ini, small);
182 case lang_group_statement_enum:
183 sort_toc_sections (&s->group_statement.children, ini, small);
186 case lang_input_section_enum:
187 i = s->input_section.section;
188 /* Leave the stub_file .got where it is. We put the .got
190 if (i->owner == stub_file->the_bfd)
192 if (bfd_get_section_by_name (i->owner, ".init") != NULL
193 || bfd_get_section_by_name (i->owner, ".fini") != NULL)
195 if (ini != NULL && *ini != s)
197 move_input_section (list, u, ini);
199 small = &s->header.next;
200 ini = &s->header.next;
204 small = &s->header.next;
205 ini = &s->header.next;
208 else if (ini == NULL)
211 if (ppc64_elf_has_small_toc_reloc (i))
213 if (small != NULL && *small != s)
215 move_input_section (list, u, small);
216 small = &s->header.next;
219 small = &s->header.next;
221 else if (small == NULL)
233 prelim_size_sections (void)
235 if (expld.phase != lang_mark_phase_enum)
237 expld.phase = lang_mark_phase_enum;
238 expld.dataseg.phase = exp_dataseg_none;
239 one_lang_size_sections_pass (NULL, FALSE);
240 /* We must not cache anything from the preliminary sizing. */
241 lang_reset_memory_regions ();
246 ppc_before_allocation (void)
248 if (stub_file != NULL)
251 && !ppc64_elf_edit_opd (&link_info, non_overlapping_opd))
252 einfo ("%X%P: can not edit %s %E\n", "opd");
254 if (ppc64_elf_tls_setup (&link_info, no_tls_get_addr_opt, &no_multi_toc)
257 /* Size the sections. This is premature, but we want to know the
258 TLS segment layout so that certain optimizations can be done. */
259 prelim_size_sections ();
261 if (!ppc64_elf_tls_optimize (&link_info))
262 einfo ("%X%P: TLS problem %E\n");
266 && !link_info.relocatable)
268 prelim_size_sections ();
270 if (!ppc64_elf_edit_toc (&link_info))
271 einfo ("%X%P: can not edit %s %E\n", "toc");
276 lang_output_section_statement_type *toc_os;
278 toc_os = lang_output_section_find (".got");
280 sort_toc_sections (&toc_os->children, NULL, NULL);
284 gld${EMULATION_NAME}_before_allocation ();
287 struct hook_stub_info
289 lang_statement_list_type add;
290 asection *input_section;
293 /* Traverse the linker tree to find the spot where the stub goes. */
296 hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp)
298 lang_statement_union_type *l;
301 for (; (l = *lp) != NULL; lp = &l->header.next)
303 switch (l->header.type)
305 case lang_constructors_statement_enum:
306 ret = hook_in_stub (info, &constructor_list.head);
311 case lang_output_section_statement_enum:
312 ret = hook_in_stub (info,
313 &l->output_section_statement.children.head);
318 case lang_wild_statement_enum:
319 ret = hook_in_stub (info, &l->wild_statement.children.head);
324 case lang_group_statement_enum:
325 ret = hook_in_stub (info, &l->group_statement.children.head);
330 case lang_input_section_enum:
331 if (l->input_section.section == info->input_section)
333 /* We've found our section. Insert the stub immediately
334 before its associated input section. */
335 *lp = info->add.head;
336 *(info->add.tail) = l;
341 case lang_data_statement_enum:
342 case lang_reloc_statement_enum:
343 case lang_object_symbols_statement_enum:
344 case lang_output_statement_enum:
345 case lang_target_statement_enum:
346 case lang_input_statement_enum:
347 case lang_assignment_statement_enum:
348 case lang_padding_statement_enum:
349 case lang_address_statement_enum:
350 case lang_fill_statement_enum:
362 /* Call-back for ppc64_elf_size_stubs. */
364 /* Create a new stub section, and arrange for it to be linked
365 immediately before INPUT_SECTION. */
368 ppc_add_stub_section (const char *stub_sec_name, asection *input_section)
372 asection *output_section;
374 lang_output_section_statement_type *os;
375 struct hook_stub_info info;
377 flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
378 | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_KEEP);
379 stub_sec = bfd_make_section_anyway_with_flags (stub_file->the_bfd,
380 stub_sec_name, flags);
382 || !bfd_set_section_alignment (stub_file->the_bfd, stub_sec, 5))
385 output_section = input_section->output_section;
386 secname = bfd_get_section_name (output_section->owner, output_section);
387 os = lang_output_section_find (secname);
389 info.input_section = input_section;
390 lang_list_init (&info.add);
391 lang_add_section (&info.add, stub_sec, os);
393 if (info.add.head == NULL)
397 if (hook_in_stub (&info, &os->children.head))
401 einfo ("%X%P: can not make stub section: %E\n");
406 /* Another call-back for ppc64_elf_size_stubs. */
409 ppc_layout_sections_again (void)
411 /* If we have changed sizes of the stub sections, then we need
412 to recalculate all the section offsets. This may mean we need to
413 add even more stubs. */
414 gld${EMULATION_NAME}_map_segments (TRUE);
416 if (!link_info.relocatable)
417 _bfd_set_gp_value (link_info.output_bfd,
418 ppc64_elf_toc (link_info.output_bfd));
420 need_laying_out = -1;
425 build_toc_list (lang_statement_union_type *statement)
427 if (statement->header.type == lang_input_section_enum)
429 asection *i = statement->input_section.section;
431 if (!((lang_input_statement_type *) i->owner->usrdata)->just_syms_flag
432 && (i->flags & SEC_EXCLUDE) == 0
433 && i->output_section == toc_section)
435 if (!ppc64_elf_next_toc_section (&link_info, i))
436 einfo ("%X%P: linker script separates .got and .toc\n");
443 build_section_lists (lang_statement_union_type *statement)
445 if (statement->header.type == lang_input_section_enum)
447 asection *i = statement->input_section.section;
449 if (!((lang_input_statement_type *) i->owner->usrdata)->just_syms_flag
450 && (i->flags & SEC_EXCLUDE) == 0
451 && i->output_section != NULL
452 && i->output_section->owner == link_info.output_bfd)
454 if (!ppc64_elf_next_input_section (&link_info, i))
455 einfo ("%X%P: can not size stub section: %E\n");
461 /* Call the back-end function to set TOC base after we have placed all
464 gld${EMULATION_NAME}_after_allocation (void)
466 /* bfd_elf_discard_info just plays with data and debugging sections,
467 ie. doesn't affect code size, so we can delay resizing the
468 sections. It's likely we'll resize everything in the process of
470 if (bfd_elf_discard_info (link_info.output_bfd, &link_info))
473 /* If generating a relocatable output file, then we don't have any
475 if (stub_file != NULL && !link_info.relocatable)
477 int ret = ppc64_elf_setup_section_lists (&link_info,
478 &ppc_add_stub_section,
479 &ppc_layout_sections_again);
481 einfo ("%X%P: can not size stub section: %E\n");
484 ppc64_elf_start_multitoc_partition (&link_info);
488 toc_section = bfd_get_section_by_name (link_info.output_bfd,
490 if (toc_section != NULL)
491 lang_for_each_statement (build_toc_list);
494 if (ppc64_elf_layout_multitoc (&link_info)
496 && toc_section != NULL)
497 lang_for_each_statement (build_toc_list);
499 ppc64_elf_finish_multitoc_partition (&link_info);
501 lang_for_each_statement (build_section_lists);
503 if (!ppc64_elf_check_init_fini (&link_info))
504 einfo ("%P: .init/.fini fragments use differing TOC pointers\n");
506 /* Call into the BFD backend to do the real work. */
507 if (!ppc64_elf_size_stubs (&link_info, group_size, plt_static_chain))
508 einfo ("%X%P: can not size stub section: %E\n");
512 if (need_laying_out != -1)
514 gld${EMULATION_NAME}_map_segments (need_laying_out);
516 if (!link_info.relocatable)
517 _bfd_set_gp_value (link_info.output_bfd,
518 ppc64_elf_toc (link_info.output_bfd));
523 /* Final emulation specific call. */
526 gld${EMULATION_NAME}_finish (void)
528 /* e_entry on PowerPC64 points to the function descriptor for
529 _start. If _start is missing, default to the first function
530 descriptor in the .opd section. */
531 entry_section = ".opd";
536 char *line, *endline;
538 if (emit_stub_syms < 0)
540 if (!ppc64_elf_build_stubs (emit_stub_syms, &link_info,
541 config.stats ? &msg : NULL))
542 einfo ("%X%P: can not build stubs: %E\n");
545 for (line = msg; line != NULL; line = endline)
547 endline = strchr (line, '\n');
550 fprintf (stderr, "%s: %s\n", program_name, line);
557 ppc64_elf_restore_symbols (&link_info);
562 /* Add a pattern matching ".foo" for every "foo" in a version script.
564 The reason for doing this is that many shared library version
565 scripts export a selected set of functions or data symbols, forcing
570 . this; that; some; thing;
575 To make the above work for PowerPC64, we need to export ".this",
576 ".that" and so on, otherwise only the function descriptor syms are
577 exported. Lack of an exported function code sym may cause a
578 definition to be pulled in from a static library. */
580 static struct bfd_elf_version_expr *
581 gld${EMULATION_NAME}_new_vers_pattern (struct bfd_elf_version_expr *entry)
583 struct bfd_elf_version_expr *dot_entry;
588 || entry->pattern[0] == '.'
589 || (!entry->literal && entry->pattern[0] == '*'))
592 dot_entry = xmalloc (sizeof *dot_entry);
594 dot_entry->next = entry;
595 len = strlen (entry->pattern) + 2;
596 dot_pat = xmalloc (len);
598 memcpy (dot_pat + 1, entry->pattern, len - 1);
599 dot_entry->pattern = dot_pat;
600 dot_entry->script = 1;
605 /* Avoid processing the fake stub_file in vercheck, stat_needed and
606 check_needed routines. */
608 static void (*real_func) (lang_input_statement_type *);
610 static void ppc_for_each_input_file_wrapper (lang_input_statement_type *l)
617 ppc_lang_for_each_input_file (void (*func) (lang_input_statement_type *))
620 lang_for_each_input_file (&ppc_for_each_input_file_wrapper);
623 #define lang_for_each_input_file ppc_lang_for_each_input_file
627 if grep -q 'ld_elf32_spu_emulation' ldemul-list.h; then
629 /* Special handling for embedded SPU executables. */
630 extern bfd_boolean embedded_spu_file (lang_input_statement_type *, const char *);
631 static bfd_boolean gld${EMULATION_NAME}_load_symbols (lang_input_statement_type *);
634 ppc64_recognized_file (lang_input_statement_type *entry)
636 if (embedded_spu_file (entry, "-m64"))
639 return gld${EMULATION_NAME}_load_symbols (entry);
642 LDEMUL_RECOGNIZED_FILE=ppc64_recognized_file
645 # Define some shell vars to insert bits of code into the standard elf
646 # parse_args and list_options functions.
648 PARSE_AND_LIST_PROLOGUE=${PARSE_AND_LIST_PROLOGUE}'
649 #define OPTION_STUBGROUP_SIZE 321
650 #define OPTION_PLT_STATIC_CHAIN (OPTION_STUBGROUP_SIZE + 1)
651 #define OPTION_NO_PLT_STATIC_CHAIN (OPTION_PLT_STATIC_CHAIN + 1)
652 #define OPTION_STUBSYMS (OPTION_NO_PLT_STATIC_CHAIN + 1)
653 #define OPTION_NO_STUBSYMS (OPTION_STUBSYMS + 1)
654 #define OPTION_DOTSYMS (OPTION_NO_STUBSYMS + 1)
655 #define OPTION_NO_DOTSYMS (OPTION_DOTSYMS + 1)
656 #define OPTION_NO_TLS_OPT (OPTION_NO_DOTSYMS + 1)
657 #define OPTION_NO_TLS_GET_ADDR_OPT (OPTION_NO_TLS_OPT + 1)
658 #define OPTION_NO_OPD_OPT (OPTION_NO_TLS_GET_ADDR_OPT + 1)
659 #define OPTION_NO_TOC_OPT (OPTION_NO_OPD_OPT + 1)
660 #define OPTION_NO_MULTI_TOC (OPTION_NO_TOC_OPT + 1)
661 #define OPTION_NO_TOC_SORT (OPTION_NO_MULTI_TOC + 1)
662 #define OPTION_NON_OVERLAPPING_OPD (OPTION_NO_TOC_SORT + 1)
665 PARSE_AND_LIST_LONGOPTS=${PARSE_AND_LIST_LONGOPTS}'
666 { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
667 { "plt-static-chain", no_argument, NULL, OPTION_PLT_STATIC_CHAIN },
668 { "no-plt-static-chain", no_argument, NULL, OPTION_NO_PLT_STATIC_CHAIN },
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=${PARSE_AND_LIST_OPTIONS}'
684 --stub-group-size=N Maximum size of a group of input sections that\n\
685 can be handled by one stub section. A negative\n\
686 value locates all stubs before their branches\n\
687 (with a group size of -N), while a positive\n\
688 value allows two groups of input sections, one\n\
689 before, and one after each stub section.\n\
690 Values of +/-1 indicate the linker should\n\
691 choose suitable defaults.\n"
694 --plt-static-chain PLT call stubs should load r11.\n"
697 --no-plt-static-chain PLT call stubs should not load r11. (default)\n"
700 --emit-stub-syms Label linker stubs with a symbol.\n"
703 --no-emit-stub-syms Don'\''t label linker stubs with a symbol.\n"
706 --dotsyms For every version pattern \"foo\" in a version\n\
707 script, add \".foo\" so that function code\n\
708 symbols are treated the same as function\n\
709 descriptor symbols. Defaults to on.\n"
712 --no-dotsyms Don'\''t do anything special in version scripts.\n"
715 --no-tls-optimize Don'\''t try to optimize TLS accesses.\n"
718 --no-tls-get-addr-optimize Don'\''t use a special __tls_get_addr call.\n"
721 --no-opd-optimize Don'\''t optimize the OPD section.\n"
724 --no-toc-optimize Don'\''t optimize the TOC section.\n"
727 --no-multi-toc Disallow automatic multiple toc sections.\n"
730 --no-toc-sort Don'\''t sort TOC and GOT sections.\n"
733 --non-overlapping-opd Canonicalize .opd, so that there are no\n\
734 overlapping .opd entries.\n"
738 PARSE_AND_LIST_ARGS_CASES=${PARSE_AND_LIST_ARGS_CASES}'
739 case OPTION_STUBGROUP_SIZE:
742 group_size = bfd_scan_vma (optarg, &end, 0);
744 einfo (_("%P%F: invalid number `%s'\''\n"), optarg);
748 case OPTION_PLT_STATIC_CHAIN:
749 plt_static_chain = 1;
752 case OPTION_NO_PLT_STATIC_CHAIN:
753 plt_static_chain = 0;
756 case OPTION_STUBSYMS:
760 case OPTION_NO_STUBSYMS:
768 case OPTION_NO_DOTSYMS:
772 case OPTION_NO_TLS_OPT:
776 case OPTION_NO_TLS_GET_ADDR_OPT:
777 no_tls_get_addr_opt = 1;
780 case OPTION_NO_OPD_OPT:
784 case OPTION_NO_TOC_OPT:
788 case OPTION_NO_MULTI_TOC:
792 case OPTION_NO_TOC_SORT:
796 case OPTION_NON_OVERLAPPING_OPD:
797 non_overlapping_opd = 1;
801 # Put these extra ppc64elf routines in ld_${EMULATION_NAME}_emulation
803 LDEMUL_BEFORE_ALLOCATION=ppc_before_allocation
804 LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
805 LDEMUL_FINISH=gld${EMULATION_NAME}_finish
806 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=ppc_create_output_section_statements
807 LDEMUL_NEW_VERS_PATTERN=gld${EMULATION_NAME}_new_vers_pattern