1 # This shell script emits a C file. -*- C -*-
2 # Copyright 2002, 2003, 2004, 2005 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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, 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 allow multiple toc sections. */
56 static int no_multi_toc = 0;
58 /* Whether to emit symbols for stubs. */
59 static int emit_stub_syms = 0;
61 static asection *toc_section = 0;
63 /* Whether to canonicalize .opd so that there are no overlapping
65 static int non_overlapping_opd = 0;
67 /* This is called before the input files are opened. We create a new
68 fake input file to hold the stub sections. */
71 ppc_create_output_section_statements (void)
73 extern const bfd_target bfd_elf64_powerpc_vec;
74 extern const bfd_target bfd_elf64_powerpcle_vec;
77 if (link_info.hash->creator != &bfd_elf64_powerpc_vec
78 && link_info.hash->creator != &bfd_elf64_powerpcle_vec)
81 link_info.wrap_char = '.';
83 stub_file = lang_add_input_file ("linker stubs",
84 lang_input_file_is_fake_enum,
86 stub_file->the_bfd = bfd_create ("linker stubs", output_bfd);
87 if (stub_file->the_bfd == NULL
88 || !bfd_set_arch_mach (stub_file->the_bfd,
89 bfd_get_arch (output_bfd),
90 bfd_get_mach (output_bfd)))
92 einfo ("%F%P: can not create BFD %E\n");
96 if (bfd_get_section_by_name (stub_file->the_bfd, ".note.GNU-stack") == NULL)
97 sect = bfd_make_section (stub_file->the_bfd, ".note.GNU-stack");
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);
104 ppc_before_allocation (void)
106 if (stub_file != NULL)
108 if (!ppc64_elf_edit_opd (output_bfd, &link_info, no_opd_opt,
109 non_overlapping_opd))
110 einfo ("%X%P: can not edit %s %E\n", "opd");
112 if (ppc64_elf_tls_setup (output_bfd, &link_info) && !no_tls_opt)
114 /* Size the sections. This is premature, but we want to know the
115 TLS segment layout so that certain optimizations can be done. */
116 expld.phase = lang_mark_phase_enum;
117 expld.dataseg.phase = exp_dataseg_none;
118 one_lang_size_sections_pass (NULL, TRUE);
120 if (!ppc64_elf_tls_optimize (output_bfd, &link_info))
121 einfo ("%X%P: TLS problem %E\n");
123 /* We must not cache anything from the preliminary sizing. */
124 lang_reset_memory_regions ();
128 && !link_info.relocatable
129 && !ppc64_elf_edit_toc (output_bfd, &link_info))
130 einfo ("%X%P: can not edit %s %E\n", "toc");
133 gld${EMULATION_NAME}_before_allocation ();
136 struct hook_stub_info
138 lang_statement_list_type add;
139 asection *input_section;
142 /* Traverse the linker tree to find the spot where the stub goes. */
145 hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp)
147 lang_statement_union_type *l;
150 for (; (l = *lp) != NULL; lp = &l->header.next)
152 switch (l->header.type)
154 case lang_constructors_statement_enum:
155 ret = hook_in_stub (info, &constructor_list.head);
160 case lang_output_section_statement_enum:
161 ret = hook_in_stub (info,
162 &l->output_section_statement.children.head);
167 case lang_wild_statement_enum:
168 ret = hook_in_stub (info, &l->wild_statement.children.head);
173 case lang_group_statement_enum:
174 ret = hook_in_stub (info, &l->group_statement.children.head);
179 case lang_input_section_enum:
180 if (l->input_section.section == info->input_section)
182 /* We've found our section. Insert the stub immediately
183 before its associated input section. */
184 *lp = info->add.head;
185 *(info->add.tail) = l;
190 case lang_data_statement_enum:
191 case lang_reloc_statement_enum:
192 case lang_object_symbols_statement_enum:
193 case lang_output_statement_enum:
194 case lang_target_statement_enum:
195 case lang_input_statement_enum:
196 case lang_assignment_statement_enum:
197 case lang_padding_statement_enum:
198 case lang_address_statement_enum:
199 case lang_fill_statement_enum:
211 /* Call-back for ppc64_elf_size_stubs. */
213 /* Create a new stub section, and arrange for it to be linked
214 immediately before INPUT_SECTION. */
217 ppc_add_stub_section (const char *stub_sec_name, asection *input_section)
221 asection *output_section;
223 lang_output_section_statement_type *os;
224 struct hook_stub_info info;
226 stub_sec = bfd_make_section_anyway (stub_file->the_bfd, stub_sec_name);
227 if (stub_sec == NULL)
230 flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
231 | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_KEEP);
232 if (!bfd_set_section_flags (stub_file->the_bfd, stub_sec, flags))
235 output_section = input_section->output_section;
236 secname = bfd_get_section_name (output_section->owner, output_section);
237 os = lang_output_section_find (secname);
239 info.input_section = input_section;
240 lang_list_init (&info.add);
241 lang_add_section (&info.add, stub_sec, os);
243 if (info.add.head == NULL)
247 if (hook_in_stub (&info, &os->children.head))
251 einfo ("%X%P: can not make stub section: %E\n");
256 /* Another call-back for ppc64_elf_size_stubs. */
259 ppc_layout_sections_again (void)
261 /* If we have changed sizes of the stub sections, then we need
262 to recalculate all the section offsets. This may mean we need to
263 add even more stubs. */
264 gld${EMULATION_NAME}_map_segments (TRUE);
265 need_laying_out = -1;
269 /* Call the back-end function to set TOC base after we have placed all
272 gld${EMULATION_NAME}_after_allocation (void)
274 if (!link_info.relocatable)
275 _bfd_set_gp_value (output_bfd, ppc64_elf_toc (output_bfd));
280 build_toc_list (lang_statement_union_type *statement)
282 if (statement->header.type == lang_input_section_enum)
284 asection *i = statement->input_section.section;
286 if (!((lang_input_statement_type *) i->owner->usrdata)->just_syms_flag
287 && (i->flags & SEC_EXCLUDE) == 0
288 && i->output_section == toc_section)
289 ppc64_elf_next_toc_section (&link_info, i);
295 build_section_lists (lang_statement_union_type *statement)
297 if (statement->header.type == lang_input_section_enum)
299 asection *i = statement->input_section.section;
301 if (!((lang_input_statement_type *) i->owner->usrdata)->just_syms_flag
302 && (i->flags & SEC_EXCLUDE) == 0
303 && i->output_section != NULL
304 && i->output_section->owner == output_bfd)
306 if (!ppc64_elf_next_input_section (&link_info, i))
307 einfo ("%X%P: can not size stub section: %E\n");
313 /* Final emulation specific call. */
316 gld${EMULATION_NAME}_finish (void)
318 /* e_entry on PowerPC64 points to the function descriptor for
319 _start. If _start is missing, default to the first function
320 descriptor in the .opd section. */
321 entry_section = ".opd";
323 /* bfd_elf_discard_info just plays with debugging sections,
324 ie. doesn't affect any code, so we can delay resizing the
325 sections. It's likely we'll resize everything in the process of
327 if (bfd_elf_discard_info (output_bfd, &link_info))
330 /* If generating a relocatable output file, then we don't have any
332 if (stub_file != NULL && !link_info.relocatable)
334 int ret = ppc64_elf_setup_section_lists (output_bfd, &link_info,
337 einfo ("%X%P: can not size stub section: %E\n");
340 toc_section = bfd_get_section_by_name (output_bfd, ".got");
341 if (toc_section != NULL)
342 lang_for_each_statement (build_toc_list);
344 ppc64_elf_reinit_toc (output_bfd, &link_info);
346 lang_for_each_statement (build_section_lists);
348 /* Call into the BFD backend to do the real work. */
349 if (!ppc64_elf_size_stubs (output_bfd,
352 &ppc_add_stub_section,
353 &ppc_layout_sections_again))
354 einfo ("%X%P: can not size stub section: %E\n");
358 if (need_laying_out != -1)
359 gld${EMULATION_NAME}_map_segments (need_laying_out);
361 if (link_info.relocatable)
363 asection *toc = bfd_get_section_by_name (output_bfd, ".toc");
365 && bfd_section_size (output_bfd, toc) > 0x10000)
366 einfo ("%X%P: TOC section size exceeds 64k\n");
372 char *line, *endline;
374 emit_stub_syms |= link_info.emitrelocations;
375 if (!ppc64_elf_build_stubs (emit_stub_syms, &link_info,
376 config.stats ? &msg : NULL))
377 einfo ("%X%P: can not build stubs: %E\n");
379 for (line = msg; line != NULL; line = endline)
381 endline = strchr (line, '\n');
384 fprintf (stderr, "%s: %s\n", program_name, line);
390 ppc64_elf_restore_symbols (&link_info);
395 /* Add a pattern matching ".foo" for every "foo" in a version script.
397 The reason for doing this is that many shared library version
398 scripts export a selected set of functions or data symbols, forcing
403 . this; that; some; thing;
408 To make the above work for PowerPC64, we need to export ".this",
409 ".that" and so on, otherwise only the function descriptor syms are
410 exported. Lack of an exported function code sym may cause a
411 definition to be pulled in from a static library. */
413 static struct bfd_elf_version_expr *
414 gld${EMULATION_NAME}_new_vers_pattern (struct bfd_elf_version_expr *entry)
416 struct bfd_elf_version_expr *dot_entry;
421 || (entry->pattern != NULL
422 && (entry->pattern[0] == '*' || entry->pattern[0] == '.')))
425 dot_entry = xmalloc (sizeof *dot_entry);
427 dot_entry->next = entry;
428 if (entry->pattern != NULL)
430 len = strlen (entry->pattern) + 2;
431 dot_pat = xmalloc (len);
433 memcpy (dot_pat + 1, entry->pattern, len - 1);
434 dot_entry->pattern = dot_pat;
436 if (entry->symbol != NULL)
438 len = strlen (entry->symbol) + 2;
439 dot_pat = xmalloc (len);
441 memcpy (dot_pat + 1, entry->symbol, len - 1);
442 dot_entry->symbol = dot_pat;
448 /* Avoid processing the fake stub_file in vercheck, stat_needed and
449 check_needed routines. */
451 static void (*real_func) (lang_input_statement_type *);
453 static void ppc_for_each_input_file_wrapper (lang_input_statement_type *l)
460 ppc_lang_for_each_input_file (void (*func) (lang_input_statement_type *))
463 lang_for_each_input_file (&ppc_for_each_input_file_wrapper);
466 #define lang_for_each_input_file ppc_lang_for_each_input_file
470 if grep -q 'ld_elf32_spu_emulation' ldemul-list.h; then
471 cat >>e${EMULATION_NAME}.c <<EOF
472 /* Special handling for embedded SPU executables. */
473 extern bfd_boolean embedded_spu_file (lang_input_statement_type *, const char *);
474 static bfd_boolean gld${EMULATION_NAME}_load_symbols (lang_input_statement_type *);
477 ppc64_recognized_file (lang_input_statement_type *entry)
479 if (embedded_spu_file (entry, "-m64"))
482 return gld${EMULATION_NAME}_load_symbols (entry);
485 LDEMUL_RECOGNIZED_FILE=ppc64_recognized_file
488 # Define some shell vars to insert bits of code into the standard elf
489 # parse_args and list_options functions.
491 PARSE_AND_LIST_PROLOGUE='
492 #define OPTION_STUBGROUP_SIZE 301
493 #define OPTION_STUBSYMS (OPTION_STUBGROUP_SIZE + 1)
494 #define OPTION_DOTSYMS (OPTION_STUBSYMS + 1)
495 #define OPTION_NO_DOTSYMS (OPTION_DOTSYMS + 1)
496 #define OPTION_NO_TLS_OPT (OPTION_NO_DOTSYMS + 1)
497 #define OPTION_NO_OPD_OPT (OPTION_NO_TLS_OPT + 1)
498 #define OPTION_NO_TOC_OPT (OPTION_NO_OPD_OPT + 1)
499 #define OPTION_NO_MULTI_TOC (OPTION_NO_TOC_OPT + 1)
500 #define OPTION_NON_OVERLAPPING_OPD (OPTION_NO_MULTI_TOC + 1)
503 PARSE_AND_LIST_LONGOPTS='
504 { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
505 { "emit-stub-syms", no_argument, NULL, OPTION_STUBSYMS },
506 { "dotsyms", no_argument, NULL, OPTION_DOTSYMS },
507 { "no-dotsyms", no_argument, NULL, OPTION_NO_DOTSYMS },
508 { "no-tls-optimize", no_argument, NULL, OPTION_NO_TLS_OPT },
509 { "no-opd-optimize", no_argument, NULL, OPTION_NO_OPD_OPT },
510 { "no-toc-optimize", no_argument, NULL, OPTION_NO_TOC_OPT },
511 { "no-multi-toc", no_argument, NULL, OPTION_NO_MULTI_TOC },
512 { "non-overlapping-opd", no_argument, NULL, OPTION_NON_OVERLAPPING_OPD },
515 PARSE_AND_LIST_OPTIONS='
517 --stub-group-size=N Maximum size of a group of input sections that can be\n\
518 handled by one stub section. A negative value\n\
519 locates all stubs before their branches (with a\n\
520 group size of -N), while a positive value allows\n\
521 two groups of input sections, one before, and one\n\
522 after each stub section. Values of +/-1 indicate\n\
523 the linker should choose suitable defaults.\n"
526 --emit-stub-syms Label linker stubs with a symbol.\n"
529 --dotsyms For every version pattern \"foo\" in a version script,\n\
530 add \".foo\" so that function code symbols are\n\
531 treated the same as function descriptor symbols.\n\
535 --no-dotsyms Don'\''t do anything special in version scripts.\n"
538 --no-tls-optimize Don'\''t try to optimize TLS accesses.\n"
541 --no-opd-optimize Don'\''t optimize the OPD section.\n"
544 --no-toc-optimize Don'\''t optimize the TOC section.\n"
547 --no-multi-toc Disallow automatic multiple toc sections.\n"
550 --non-overlapping-opd Canonicalize .opd, so that there are no overlapping\n\
555 PARSE_AND_LIST_ARGS_CASES='
556 case OPTION_STUBGROUP_SIZE:
559 group_size = bfd_scan_vma (optarg, &end, 0);
561 einfo (_("%P%F: invalid number `%s'\''\n"), optarg);
565 case OPTION_STUBSYMS:
573 case OPTION_NO_DOTSYMS:
577 case OPTION_NO_TLS_OPT:
581 case OPTION_NO_OPD_OPT:
585 case OPTION_NO_TOC_OPT:
589 case OPTION_NO_MULTI_TOC:
593 case OPTION_NON_OVERLAPPING_OPD:
594 non_overlapping_opd = 1;
598 # Put these extra ppc64elf routines in ld_${EMULATION_NAME}_emulation
600 LDEMUL_BEFORE_ALLOCATION=ppc_before_allocation
601 LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
602 LDEMUL_FINISH=gld${EMULATION_NAME}_finish
603 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=ppc_create_output_section_statements
604 LDEMUL_NEW_VERS_PATTERN=gld${EMULATION_NAME}_new_vers_pattern