1 # This shell script emits a C file. -*- C -*-
2 # Copyright 2002, 2003, 2004 Free Software Foundation, Inc.
4 # This file is part of GLD, the Gnu Linker.
6 # This program is free software; you can redistribute it and/or modify
7 # it under the terms of the GNU General Public License as published by
8 # the Free Software Foundation; either version 2 of the License, or
9 # (at your option) any later version.
11 # This program is distributed in the hope that it will be useful,
12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 # GNU General Public License for more details.
16 # You should have received a copy of the GNU General Public License
17 # along with this program; if not, write to the Free Software
18 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
21 # This file is sourced from elf32.em, and defines extra powerpc64-elf
24 cat >>e${EMULATION_NAME}.c <<EOF
29 #include "elf64-ppc.h"
31 /* Fake input file for stubs. */
32 static lang_input_statement_type *stub_file;
33 static int stub_added = 0;
35 /* Whether we need to call ppc_layout_sections_again. */
36 static int need_laying_out = 0;
38 /* Maximum size of a group of input sections that can be handled by
39 one stub section. A value of +/-1 indicates the bfd back-end
40 should use a suitable default size. */
41 static bfd_signed_vma group_size = 1;
43 /* Whether to add ".foo" entries for each "foo" in a version script. */
44 static int dotsyms = 1;
46 /* Whether to run tls optimization. */
47 static int no_tls_opt = 0;
49 /* Whether to run opd optimization. */
50 static int no_opd_opt = 0;
52 /* Whether to run toc optimization. */
53 static int no_toc_opt = 0;
55 /* Whether to emit symbols for stubs. */
56 static int emit_stub_syms = 0;
58 static asection *toc_section = 0;
60 /* Whether to canonicalize .opd so that there are no overlapping
62 static int non_overlapping_opd = 0;
64 /* This is called before the input files are opened. We create a new
65 fake input file to hold the stub sections. */
68 ppc_create_output_section_statements (void)
70 extern const bfd_target bfd_elf64_powerpc_vec;
71 extern const bfd_target bfd_elf64_powerpcle_vec;
73 if (link_info.hash->creator != &bfd_elf64_powerpc_vec
74 && link_info.hash->creator != &bfd_elf64_powerpcle_vec)
77 link_info.wrap_char = '.';
79 stub_file = lang_add_input_file ("linker stubs",
80 lang_input_file_is_fake_enum,
82 stub_file->the_bfd = bfd_create ("linker stubs", output_bfd);
83 if (stub_file->the_bfd == NULL
84 || !bfd_set_arch_mach (stub_file->the_bfd,
85 bfd_get_arch (output_bfd),
86 bfd_get_mach (output_bfd)))
88 einfo ("%X%P: can not create BFD %E\n");
92 ldlang_add_file (stub_file);
93 ppc64_elf_init_stub_bfd (stub_file->the_bfd, &link_info);
97 ppc_before_allocation (void)
99 if (stub_file != NULL)
102 && !ppc64_elf_edit_opd (output_bfd, &link_info, non_overlapping_opd))
104 einfo ("%X%P: can not edit %s %E\n", "opd");
108 if (ppc64_elf_tls_setup (output_bfd, &link_info) && !no_tls_opt)
110 /* Size the sections. This is premature, but we want to know the
111 TLS segment layout so that certain optimizations can be done. */
112 lang_size_sections (stat_ptr->head, abs_output_section,
113 &stat_ptr->head, 0, 0, NULL, TRUE);
115 if (!ppc64_elf_tls_optimize (output_bfd, &link_info))
117 einfo ("%X%P: TLS problem %E\n");
121 /* We must not cache anything from the preliminary sizing. */
122 elf_tdata (output_bfd)->program_header_size = 0;
123 lang_reset_memory_regions ();
127 && !link_info.relocatable
128 && !ppc64_elf_edit_toc (output_bfd, &link_info))
130 einfo ("%X%P: can not edit %s %E\n", "toc");
135 gld${EMULATION_NAME}_before_allocation ();
138 struct hook_stub_info
140 lang_statement_list_type add;
141 asection *input_section;
144 /* Traverse the linker tree to find the spot where the stub goes. */
147 hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp)
149 lang_statement_union_type *l;
152 for (; (l = *lp) != NULL; lp = &l->header.next)
154 switch (l->header.type)
156 case lang_constructors_statement_enum:
157 ret = hook_in_stub (info, &constructor_list.head);
162 case lang_output_section_statement_enum:
163 ret = hook_in_stub (info,
164 &l->output_section_statement.children.head);
169 case lang_wild_statement_enum:
170 ret = hook_in_stub (info, &l->wild_statement.children.head);
175 case lang_group_statement_enum:
176 ret = hook_in_stub (info, &l->group_statement.children.head);
181 case lang_input_section_enum:
182 if (l->input_section.section == info->input_section)
184 /* We've found our section. Insert the stub immediately
185 before its associated input section. */
186 *lp = info->add.head;
187 *(info->add.tail) = l;
192 case lang_data_statement_enum:
193 case lang_reloc_statement_enum:
194 case lang_object_symbols_statement_enum:
195 case lang_output_statement_enum:
196 case lang_target_statement_enum:
197 case lang_input_statement_enum:
198 case lang_assignment_statement_enum:
199 case lang_padding_statement_enum:
200 case lang_address_statement_enum:
201 case lang_fill_statement_enum:
213 /* Call-back for ppc64_elf_size_stubs. */
215 /* Create a new stub section, and arrange for it to be linked
216 immediately before INPUT_SECTION. */
219 ppc_add_stub_section (const char *stub_sec_name, asection *input_section)
223 asection *output_section;
225 lang_output_section_statement_type *os;
226 struct hook_stub_info info;
228 stub_sec = bfd_make_section_anyway (stub_file->the_bfd, stub_sec_name);
229 if (stub_sec == NULL)
232 flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
233 | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
234 if (!bfd_set_section_flags (stub_file->the_bfd, stub_sec, flags))
237 output_section = input_section->output_section;
238 secname = bfd_get_section_name (output_section->owner, output_section);
239 os = lang_output_section_find (secname);
241 info.input_section = input_section;
242 lang_list_init (&info.add);
243 lang_add_section (&info.add, stub_sec, os, stub_file);
245 if (info.add.head == NULL)
249 if (hook_in_stub (&info, &os->children.head))
253 einfo ("%X%P: can not make stub section: %E\n");
258 /* Another call-back for ppc64_elf_size_stubs. */
261 ppc_layout_sections_again (void)
263 /* If we have changed sizes of the stub sections, then we need
264 to recalculate all the section offsets. This may mean we need to
265 add even more stubs. */
268 lang_reset_memory_regions ();
270 /* Resize the sections. */
271 lang_size_sections (stat_ptr->head, abs_output_section,
272 &stat_ptr->head, 0, 0, NULL, TRUE);
274 /* Recalculate TOC base. */
275 ldemul_after_allocation ();
277 /* Do the assignments again. */
278 lang_do_assignments (stat_ptr->head, abs_output_section, NULL, 0);
282 /* Call the back-end function to set TOC base after we have placed all
285 gld${EMULATION_NAME}_after_allocation (void)
287 if (!link_info.relocatable)
288 _bfd_set_gp_value (output_bfd, ppc64_elf_toc (output_bfd));
293 build_toc_list (lang_statement_union_type *statement)
295 if (statement->header.type == lang_input_section_enum
296 && !statement->input_section.ifile->just_syms_flag
297 && (statement->input_section.section->flags & SEC_EXCLUDE) == 0
298 && statement->input_section.section->output_section == toc_section)
299 ppc64_elf_next_toc_section (&link_info, statement->input_section.section);
304 build_section_lists (lang_statement_union_type *statement)
306 if (statement->header.type == lang_input_section_enum
307 && !statement->input_section.ifile->just_syms_flag
308 && (statement->input_section.section->flags & SEC_EXCLUDE) == 0
309 && statement->input_section.section->output_section != NULL
310 && statement->input_section.section->output_section->owner == output_bfd)
312 if (!ppc64_elf_next_input_section (&link_info,
313 statement->input_section.section))
314 einfo ("%X%P: can not size stub section: %E\n");
319 /* Final emulation specific call. */
322 gld${EMULATION_NAME}_finish (void)
324 /* e_entry on PowerPC64 points to the function descriptor for
325 _start. If _start is missing, default to the first function
326 descriptor in the .opd section. */
327 entry_section = ".opd";
329 /* bfd_elf_discard_info just plays with debugging sections,
330 ie. doesn't affect any code, so we can delay resizing the
331 sections. It's likely we'll resize everything in the process of
333 if (bfd_elf_discard_info (output_bfd, &link_info))
336 /* If generating a relocatable output file, then we don't have any
338 if (stub_file != NULL && !link_info.relocatable)
340 int ret = ppc64_elf_setup_section_lists (output_bfd, &link_info);
345 einfo ("%X%P: can not size stub section: %E\n");
349 toc_section = bfd_get_section_by_name (output_bfd, ".got");
350 if (toc_section != NULL)
351 lang_for_each_statement (build_toc_list);
353 ppc64_elf_reinit_toc (output_bfd, &link_info);
355 lang_for_each_statement (build_section_lists);
357 /* Call into the BFD backend to do the real work. */
358 if (!ppc64_elf_size_stubs (output_bfd,
361 &ppc_add_stub_section,
362 &ppc_layout_sections_again))
364 einfo ("%X%P: can not size stub section: %E\n");
371 ppc_layout_sections_again ();
373 if (link_info.relocatable)
375 asection *toc = bfd_get_section_by_name (output_bfd, ".toc");
377 && bfd_section_size (output_bfd, toc) > 0x10000)
378 einfo ("%X%P: TOC section size exceeds 64k\n");
384 char *line, *endline;
386 emit_stub_syms |= link_info.emitrelocations;
387 if (!ppc64_elf_build_stubs (emit_stub_syms, &link_info,
388 config.stats ? &msg : NULL))
389 einfo ("%X%P: can not build stubs: %E\n");
391 for (line = msg; line != NULL; line = endline)
393 endline = strchr (line, '\n');
396 fprintf (stderr, "%s: %s\n", program_name, line);
402 ppc64_elf_restore_symbols (&link_info);
406 /* Add a pattern matching ".foo" for every "foo" in a version script.
408 The reason for doing this is that many shared library version
409 scripts export a selected set of functions or data symbols, forcing
414 . this; that; some; thing;
419 To make the above work for PowerPC64, we need to export ".this",
420 ".that" and so on, otherwise only the function descriptor syms are
421 exported. Lack of an exported function code sym may cause a
422 definition to be pulled in from a static library. */
424 static struct bfd_elf_version_expr *
425 gld${EMULATION_NAME}_new_vers_pattern (struct bfd_elf_version_expr *entry)
427 struct bfd_elf_version_expr *dot_entry;
431 if (!dotsyms || entry->pattern[0] == '*' || entry->pattern[0] == '.')
434 dot_entry = xmalloc (sizeof *dot_entry);
436 dot_entry->next = entry;
437 len = strlen (entry->pattern) + 2;
438 dot_pat = xmalloc (len);
440 memcpy (dot_pat + 1, entry->pattern, len - 1);
441 dot_entry->pattern = dot_pat;
442 if (entry->symbol != NULL)
444 len = strlen (entry->symbol) + 2;
445 dot_pat = xmalloc (len);
447 memcpy (dot_pat + 1, entry->symbol, len - 1);
448 dot_entry->symbol = dot_pat;
454 /* Avoid processing the fake stub_file in vercheck, stat_needed and
455 check_needed routines. */
457 static void (*real_func) (lang_input_statement_type *);
459 static void ppc_for_each_input_file_wrapper (lang_input_statement_type *l)
466 ppc_lang_for_each_input_file (void (*func) (lang_input_statement_type *))
469 lang_for_each_input_file (&ppc_for_each_input_file_wrapper);
472 #define lang_for_each_input_file ppc_lang_for_each_input_file
476 # Define some shell vars to insert bits of code into the standard elf
477 # parse_args and list_options functions.
479 PARSE_AND_LIST_PROLOGUE='
480 #define OPTION_STUBGROUP_SIZE 301
481 #define OPTION_STUBSYMS (OPTION_STUBGROUP_SIZE + 1)
482 #define OPTION_DOTSYMS (OPTION_STUBSYMS + 1)
483 #define OPTION_NO_DOTSYMS (OPTION_DOTSYMS + 1)
484 #define OPTION_NO_TLS_OPT (OPTION_NO_DOTSYMS + 1)
485 #define OPTION_NO_OPD_OPT (OPTION_NO_TLS_OPT + 1)
486 #define OPTION_NO_TOC_OPT (OPTION_NO_OPD_OPT + 1)
487 #define OPTION_NON_OVERLAPPING_OPD (OPTION_NO_TOC_OPT + 1)
490 PARSE_AND_LIST_LONGOPTS='
491 { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
492 { "emit-stub-syms", no_argument, NULL, OPTION_STUBSYMS },
493 { "dotsyms", no_argument, NULL, OPTION_DOTSYMS },
494 { "no-dotsyms", no_argument, NULL, OPTION_NO_DOTSYMS },
495 { "no-tls-optimize", no_argument, NULL, OPTION_NO_TLS_OPT },
496 { "no-opd-optimize", no_argument, NULL, OPTION_NO_OPD_OPT },
497 { "no-toc-optimize", no_argument, NULL, OPTION_NO_TOC_OPT },
498 { "non-overlapping-opd", no_argument, NULL, OPTION_NON_OVERLAPPING_OPD },
501 PARSE_AND_LIST_OPTIONS='
503 --stub-group-size=N Maximum size of a group of input sections that can be\n\
504 handled by one stub section. A negative value\n\
505 locates all stubs before their branches (with a\n\
506 group size of -N), while a positive value allows\n\
507 two groups of input sections, one before, and one\n\
508 after each stub section. Values of +/-1 indicate\n\
509 the linker should choose suitable defaults.\n"
512 --emit-stub-syms Label linker stubs with a symbol.\n"
515 --dotsyms For every version pattern \"foo\" in a version script,\n\
516 add \".foo\" so that function code symbols are\n\
517 treated the same as function descriptor symbols.\n\
521 --no-dotsyms Don'\''t do anything special in version scripts.\n"
524 --no-tls-optimize Don'\''t try to optimize TLS accesses.\n"
527 --no-opd-optimize Don'\''t optimize the OPD section.\n"
530 --no-toc-optimize Don'\''t optimize the TOC section.\n"
533 --non-overlapping-opd Canonicalize .opd, so that there are no overlapping\n\
538 PARSE_AND_LIST_ARGS_CASES='
539 case OPTION_STUBGROUP_SIZE:
542 group_size = bfd_scan_vma (optarg, &end, 0);
544 einfo (_("%P%F: invalid number `%s'\''\n"), optarg);
548 case OPTION_STUBSYMS:
556 case OPTION_NO_DOTSYMS:
560 case OPTION_NO_TLS_OPT:
564 case OPTION_NO_OPD_OPT:
568 case OPTION_NO_TOC_OPT:
572 case OPTION_NON_OVERLAPPING_OPD:
573 non_overlapping_opd = 1;
577 # Put these extra ppc64elf routines in ld_${EMULATION_NAME}_emulation
579 LDEMUL_BEFORE_ALLOCATION=ppc_before_allocation
580 LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
581 LDEMUL_FINISH=gld${EMULATION_NAME}_finish
582 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=ppc_create_output_section_statements
583 LDEMUL_NEW_VERS_PATTERN=gld${EMULATION_NAME}_new_vers_pattern