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);
381 if (stub_sec == NULL)
384 output_section = input_section->output_section;
385 secname = bfd_get_section_name (output_section->owner, output_section);
386 os = lang_output_section_find (secname);
388 info.input_section = input_section;
389 lang_list_init (&info.add);
390 lang_add_section (&info.add, stub_sec, os);
392 if (info.add.head == NULL)
396 if (hook_in_stub (&info, &os->children.head))
400 einfo ("%X%P: can not make stub section: %E\n");
405 /* Another call-back for ppc64_elf_size_stubs. */
408 ppc_layout_sections_again (void)
410 /* If we have changed sizes of the stub sections, then we need
411 to recalculate all the section offsets. This may mean we need to
412 add even more stubs. */
413 gld${EMULATION_NAME}_map_segments (TRUE);
415 if (!link_info.relocatable)
416 _bfd_set_gp_value (link_info.output_bfd,
417 ppc64_elf_toc (link_info.output_bfd));
419 need_laying_out = -1;
424 build_toc_list (lang_statement_union_type *statement)
426 if (statement->header.type == lang_input_section_enum)
428 asection *i = statement->input_section.section;
430 if (!((lang_input_statement_type *) i->owner->usrdata)->just_syms_flag
431 && (i->flags & SEC_EXCLUDE) == 0
432 && i->output_section == toc_section)
434 if (!ppc64_elf_next_toc_section (&link_info, i))
435 einfo ("%X%P: linker script separates .got and .toc\n");
442 build_section_lists (lang_statement_union_type *statement)
444 if (statement->header.type == lang_input_section_enum)
446 asection *i = statement->input_section.section;
448 if (!((lang_input_statement_type *) i->owner->usrdata)->just_syms_flag
449 && (i->flags & SEC_EXCLUDE) == 0
450 && i->output_section != NULL
451 && i->output_section->owner == link_info.output_bfd)
453 if (!ppc64_elf_next_input_section (&link_info, i))
454 einfo ("%X%P: can not size stub section: %E\n");
460 /* Call the back-end function to set TOC base after we have placed all
463 gld${EMULATION_NAME}_after_allocation (void)
465 /* bfd_elf_discard_info just plays with data and debugging sections,
466 ie. doesn't affect code size, so we can delay resizing the
467 sections. It's likely we'll resize everything in the process of
469 if (bfd_elf_discard_info (link_info.output_bfd, &link_info))
472 /* If generating a relocatable output file, then we don't have any
474 if (stub_file != NULL && !link_info.relocatable)
476 int ret = ppc64_elf_setup_section_lists (&link_info,
477 &ppc_add_stub_section,
478 &ppc_layout_sections_again);
480 einfo ("%X%P: can not size stub section: %E\n");
483 ppc64_elf_start_multitoc_partition (&link_info);
487 toc_section = bfd_get_section_by_name (link_info.output_bfd,
489 if (toc_section != NULL)
490 lang_for_each_statement (build_toc_list);
493 if (ppc64_elf_layout_multitoc (&link_info)
495 && toc_section != NULL)
496 lang_for_each_statement (build_toc_list);
498 ppc64_elf_finish_multitoc_partition (&link_info);
500 lang_for_each_statement (build_section_lists);
502 if (!ppc64_elf_check_init_fini (&link_info))
503 einfo ("%P: .init/.fini fragments use differing TOC pointers\n");
505 /* Call into the BFD backend to do the real work. */
506 if (!ppc64_elf_size_stubs (&link_info, group_size, plt_static_chain))
507 einfo ("%X%P: can not size stub section: %E\n");
511 if (need_laying_out != -1)
513 gld${EMULATION_NAME}_map_segments (need_laying_out);
515 if (!link_info.relocatable)
516 _bfd_set_gp_value (link_info.output_bfd,
517 ppc64_elf_toc (link_info.output_bfd));
522 /* Final emulation specific call. */
525 gld${EMULATION_NAME}_finish (void)
527 /* e_entry on PowerPC64 points to the function descriptor for
528 _start. If _start is missing, default to the first function
529 descriptor in the .opd section. */
530 entry_section = ".opd";
532 if (link_info.relocatable)
534 asection *toc = bfd_get_section_by_name (link_info.output_bfd, ".toc");
536 && bfd_section_size (link_info.output_bfd, toc) > 0x10000)
537 einfo ("%X%P: TOC section size exceeds 64k\n");
543 char *line, *endline;
545 if (emit_stub_syms < 0)
547 if (!ppc64_elf_build_stubs (emit_stub_syms, &link_info,
548 config.stats ? &msg : NULL))
549 einfo ("%X%P: can not build stubs: %E\n");
552 for (line = msg; line != NULL; line = endline)
554 endline = strchr (line, '\n');
557 fprintf (stderr, "%s: %s\n", program_name, line);
564 ppc64_elf_restore_symbols (&link_info);
569 /* Add a pattern matching ".foo" for every "foo" in a version script.
571 The reason for doing this is that many shared library version
572 scripts export a selected set of functions or data symbols, forcing
577 . this; that; some; thing;
582 To make the above work for PowerPC64, we need to export ".this",
583 ".that" and so on, otherwise only the function descriptor syms are
584 exported. Lack of an exported function code sym may cause a
585 definition to be pulled in from a static library. */
587 static struct bfd_elf_version_expr *
588 gld${EMULATION_NAME}_new_vers_pattern (struct bfd_elf_version_expr *entry)
590 struct bfd_elf_version_expr *dot_entry;
595 || entry->pattern[0] == '.'
596 || (!entry->literal && entry->pattern[0] == '*'))
599 dot_entry = xmalloc (sizeof *dot_entry);
601 dot_entry->next = entry;
602 len = strlen (entry->pattern) + 2;
603 dot_pat = xmalloc (len);
605 memcpy (dot_pat + 1, entry->pattern, len - 1);
606 dot_entry->pattern = dot_pat;
607 dot_entry->script = 1;
612 /* Avoid processing the fake stub_file in vercheck, stat_needed and
613 check_needed routines. */
615 static void (*real_func) (lang_input_statement_type *);
617 static void ppc_for_each_input_file_wrapper (lang_input_statement_type *l)
624 ppc_lang_for_each_input_file (void (*func) (lang_input_statement_type *))
627 lang_for_each_input_file (&ppc_for_each_input_file_wrapper);
630 #define lang_for_each_input_file ppc_lang_for_each_input_file
634 if grep -q 'ld_elf32_spu_emulation' ldemul-list.h; then
636 /* Special handling for embedded SPU executables. */
637 extern bfd_boolean embedded_spu_file (lang_input_statement_type *, const char *);
638 static bfd_boolean gld${EMULATION_NAME}_load_symbols (lang_input_statement_type *);
641 ppc64_recognized_file (lang_input_statement_type *entry)
643 if (embedded_spu_file (entry, "-m64"))
646 return gld${EMULATION_NAME}_load_symbols (entry);
649 LDEMUL_RECOGNIZED_FILE=ppc64_recognized_file
652 # Define some shell vars to insert bits of code into the standard elf
653 # parse_args and list_options functions.
655 PARSE_AND_LIST_PROLOGUE=${PARSE_AND_LIST_PROLOGUE}'
656 #define OPTION_STUBGROUP_SIZE 321
657 #define OPTION_PLT_STATIC_CHAIN (OPTION_STUBGROUP_SIZE + 1)
658 #define OPTION_NO_PLT_STATIC_CHAIN (OPTION_PLT_STATIC_CHAIN + 1)
659 #define OPTION_STUBSYMS (OPTION_NO_PLT_STATIC_CHAIN + 1)
660 #define OPTION_NO_STUBSYMS (OPTION_STUBSYMS + 1)
661 #define OPTION_DOTSYMS (OPTION_NO_STUBSYMS + 1)
662 #define OPTION_NO_DOTSYMS (OPTION_DOTSYMS + 1)
663 #define OPTION_NO_TLS_OPT (OPTION_NO_DOTSYMS + 1)
664 #define OPTION_NO_TLS_GET_ADDR_OPT (OPTION_NO_TLS_OPT + 1)
665 #define OPTION_NO_OPD_OPT (OPTION_NO_TLS_GET_ADDR_OPT + 1)
666 #define OPTION_NO_TOC_OPT (OPTION_NO_OPD_OPT + 1)
667 #define OPTION_NO_MULTI_TOC (OPTION_NO_TOC_OPT + 1)
668 #define OPTION_NO_TOC_SORT (OPTION_NO_MULTI_TOC + 1)
669 #define OPTION_NON_OVERLAPPING_OPD (OPTION_NO_TOC_SORT + 1)
672 PARSE_AND_LIST_LONGOPTS=${PARSE_AND_LIST_LONGOPTS}'
673 { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
674 { "plt-static-chain", no_argument, NULL, OPTION_PLT_STATIC_CHAIN },
675 { "no-plt-static-chain", no_argument, NULL, OPTION_NO_PLT_STATIC_CHAIN },
676 { "emit-stub-syms", no_argument, NULL, OPTION_STUBSYMS },
677 { "no-emit-stub-syms", no_argument, NULL, OPTION_NO_STUBSYMS },
678 { "dotsyms", no_argument, NULL, OPTION_DOTSYMS },
679 { "no-dotsyms", no_argument, NULL, OPTION_NO_DOTSYMS },
680 { "no-tls-optimize", no_argument, NULL, OPTION_NO_TLS_OPT },
681 { "no-tls-get-addr-optimize", no_argument, NULL, OPTION_NO_TLS_GET_ADDR_OPT },
682 { "no-opd-optimize", no_argument, NULL, OPTION_NO_OPD_OPT },
683 { "no-toc-optimize", no_argument, NULL, OPTION_NO_TOC_OPT },
684 { "no-multi-toc", no_argument, NULL, OPTION_NO_MULTI_TOC },
685 { "no-toc-sort", no_argument, NULL, OPTION_NO_TOC_SORT },
686 { "non-overlapping-opd", no_argument, NULL, OPTION_NON_OVERLAPPING_OPD },
689 PARSE_AND_LIST_OPTIONS=${PARSE_AND_LIST_OPTIONS}'
691 --stub-group-size=N Maximum size of a group of input sections that\n\
692 can be handled by one stub section. A negative\n\
693 value locates all stubs before their branches\n\
694 (with a group size of -N), while a positive\n\
695 value allows two groups of input sections, one\n\
696 before, and one after each stub section.\n\
697 Values of +/-1 indicate the linker should\n\
698 choose suitable defaults.\n"
701 --plt-static-chain PLT call stubs should load r11.\n"
704 --no-plt-static-chain PLT call stubs should not load r11. (default)\n"
707 --emit-stub-syms Label linker stubs with a symbol.\n"
710 --no-emit-stub-syms Don'\''t label linker stubs with a symbol.\n"
713 --dotsyms For every version pattern \"foo\" in a version\n\
714 script, add \".foo\" so that function code\n\
715 symbols are treated the same as function\n\
716 descriptor symbols. Defaults to on.\n"
719 --no-dotsyms Don'\''t do anything special in version scripts.\n"
722 --no-tls-optimize Don'\''t try to optimize TLS accesses.\n"
725 --no-tls-get-addr-optimize Don'\''t use a special __tls_get_addr call.\n"
728 --no-opd-optimize Don'\''t optimize the OPD section.\n"
731 --no-toc-optimize Don'\''t optimize the TOC section.\n"
734 --no-multi-toc Disallow automatic multiple toc sections.\n"
737 --no-toc-sort Don'\''t sort TOC and GOT sections.\n"
740 --non-overlapping-opd Canonicalize .opd, so that there are no\n\
741 overlapping .opd entries.\n"
745 PARSE_AND_LIST_ARGS_CASES=${PARSE_AND_LIST_ARGS_CASES}'
746 case OPTION_STUBGROUP_SIZE:
749 group_size = bfd_scan_vma (optarg, &end, 0);
751 einfo (_("%P%F: invalid number `%s'\''\n"), optarg);
755 case OPTION_PLT_STATIC_CHAIN:
756 plt_static_chain = 1;
759 case OPTION_NO_PLT_STATIC_CHAIN:
760 plt_static_chain = 0;
763 case OPTION_STUBSYMS:
767 case OPTION_NO_STUBSYMS:
775 case OPTION_NO_DOTSYMS:
779 case OPTION_NO_TLS_OPT:
783 case OPTION_NO_TLS_GET_ADDR_OPT:
784 no_tls_get_addr_opt = 1;
787 case OPTION_NO_OPD_OPT:
791 case OPTION_NO_TOC_OPT:
795 case OPTION_NO_MULTI_TOC:
799 case OPTION_NO_TOC_SORT:
803 case OPTION_NON_OVERLAPPING_OPD:
804 non_overlapping_opd = 1;
808 # Put these extra ppc64elf routines in ld_${EMULATION_NAME}_emulation
810 LDEMUL_BEFORE_ALLOCATION=ppc_before_allocation
811 LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
812 LDEMUL_FINISH=gld${EMULATION_NAME}_finish
813 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=ppc_create_output_section_statements
814 LDEMUL_NEW_VERS_PATTERN=gld${EMULATION_NAME}_new_vers_pattern