1 # This shell script emits a C file. -*- C -*-
2 # Copyright 2002, 2003 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${EMULATION_NAME}.c <<EOF
28 #include "elf64-ppc.h"
30 /* Fake input file for stubs. */
31 static lang_input_statement_type *stub_file;
33 /* Whether we need to call ppc_layout_sections_again. */
34 static int need_laying_out = 0;
36 /* Maximum size of a group of input sections that can be handled by
37 one stub section. A value of +/-1 indicates the bfd back-end
38 should use a suitable default size. */
39 static bfd_signed_vma group_size = 1;
41 /* Whether to add ".foo" entries for each "foo" in a version script. */
42 static int dotsyms = 1;
44 /* Whether to run tls optimization. */
45 static int notlsopt = 0;
47 /* Whether to emit symbols for stubs. */
48 static int emit_stub_syms = 0;
50 static asection *toc_section = 0;
52 static void ppc_create_output_section_statements
54 static void ppc_after_open
56 static void ppc_before_allocation
58 static asection *ppc_add_stub_section
59 PARAMS ((const char *, asection *));
60 static void ppc_layout_sections_again
62 static void gld${EMULATION_NAME}_after_allocation
64 static void build_toc_list
65 PARAMS ((lang_statement_union_type *));
66 static void build_section_lists
67 PARAMS ((lang_statement_union_type *));
68 static struct bfd_elf_version_expr *gld${EMULATION_NAME}_new_vers_pattern
69 PARAMS ((struct bfd_elf_version_expr *));
71 /* This is called before the input files are opened. We create a new
72 fake input file to hold the stub sections. */
75 ppc_create_output_section_statements ()
77 extern const bfd_target bfd_elf64_powerpc_vec;
78 extern const bfd_target bfd_elf64_powerpcle_vec;
80 if (link_info.hash->creator != &bfd_elf64_powerpc_vec
81 && link_info.hash->creator != &bfd_elf64_powerpcle_vec)
84 stub_file = lang_add_input_file ("linker stubs",
85 lang_input_file_is_fake_enum,
87 stub_file->the_bfd = bfd_create ("linker stubs", output_bfd);
88 if (stub_file->the_bfd == NULL
89 || !bfd_set_arch_mach (stub_file->the_bfd,
90 bfd_get_arch (output_bfd),
91 bfd_get_mach (output_bfd)))
93 einfo ("%X%P: can not create BFD %E\n");
97 ldlang_add_file (stub_file);
103 if (!ppc64_elf_mark_entry_syms (&link_info))
105 einfo ("%X%P: can not mark entry symbols %E\n");
109 gld${EMULATION_NAME}_after_open ();
113 ppc_before_allocation ()
115 if (stub_file != NULL)
117 if (!ppc64_elf_edit_opd (output_bfd, &link_info))
119 einfo ("%X%P: can not edit opd %E\n");
123 if (ppc64_elf_tls_setup (output_bfd, &link_info) && !notlsopt)
125 /* Size the sections. This is premature, but we want to know the
126 TLS segment layout so that certain optimizations can be done. */
127 lang_size_sections (stat_ptr->head, abs_output_section,
128 &stat_ptr->head, 0, (bfd_vma) 0, NULL, TRUE);
130 if (!ppc64_elf_tls_optimize (output_bfd, &link_info))
132 einfo ("%X%P: TLS problem %E\n");
136 lang_reset_memory_regions ();
140 gld${EMULATION_NAME}_before_allocation ();
143 struct hook_stub_info
145 lang_statement_list_type add;
146 asection *input_section;
149 /* Traverse the linker tree to find the spot where the stub goes. */
151 static bfd_boolean hook_in_stub
152 PARAMS ((struct hook_stub_info *, lang_statement_union_type **));
155 hook_in_stub (info, lp)
156 struct hook_stub_info *info;
157 lang_statement_union_type **lp;
159 lang_statement_union_type *l;
162 for (; (l = *lp) != NULL; lp = &l->header.next)
164 switch (l->header.type)
166 case lang_constructors_statement_enum:
167 ret = hook_in_stub (info, &constructor_list.head);
172 case lang_output_section_statement_enum:
173 ret = hook_in_stub (info,
174 &l->output_section_statement.children.head);
179 case lang_wild_statement_enum:
180 ret = hook_in_stub (info, &l->wild_statement.children.head);
185 case lang_group_statement_enum:
186 ret = hook_in_stub (info, &l->group_statement.children.head);
191 case lang_input_section_enum:
192 if (l->input_section.section == info->input_section)
194 /* We've found our section. Insert the stub immediately
195 before its associated input section. */
196 *lp = info->add.head;
197 *(info->add.tail) = l;
202 case lang_data_statement_enum:
203 case lang_reloc_statement_enum:
204 case lang_object_symbols_statement_enum:
205 case lang_output_statement_enum:
206 case lang_target_statement_enum:
207 case lang_input_statement_enum:
208 case lang_assignment_statement_enum:
209 case lang_padding_statement_enum:
210 case lang_address_statement_enum:
211 case lang_fill_statement_enum:
223 /* Call-back for ppc64_elf_size_stubs. */
225 /* Create a new stub section, and arrange for it to be linked
226 immediately before INPUT_SECTION. */
229 ppc_add_stub_section (stub_sec_name, input_section)
230 const char *stub_sec_name;
231 asection *input_section;
235 asection *output_section;
237 lang_output_section_statement_type *os;
238 struct hook_stub_info info;
240 stub_sec = bfd_make_section_anyway (stub_file->the_bfd, stub_sec_name);
241 if (stub_sec == NULL)
244 flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
245 | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
246 if (!bfd_set_section_flags (stub_file->the_bfd, stub_sec, flags))
249 output_section = input_section->output_section;
250 secname = bfd_get_section_name (output_section->owner, output_section);
251 os = lang_output_section_find (secname);
253 info.input_section = input_section;
254 lang_list_init (&info.add);
255 lang_add_section (&info.add, stub_sec, os, stub_file);
257 if (info.add.head == NULL)
260 if (hook_in_stub (&info, &os->children.head))
264 einfo ("%X%P: can not make stub section: %E\n");
269 /* Another call-back for ppc64_elf_size_stubs. */
272 ppc_layout_sections_again ()
274 /* If we have changed sizes of the stub sections, then we need
275 to recalculate all the section offsets. This may mean we need to
276 add even more stubs. */
279 lang_reset_memory_regions ();
281 /* Resize the sections. */
282 lang_size_sections (stat_ptr->head, abs_output_section,
283 &stat_ptr->head, 0, (bfd_vma) 0, NULL, TRUE);
285 /* Recalculate TOC base. */
286 ldemul_after_allocation ();
288 /* Do the assignments again. */
289 lang_do_assignments (stat_ptr->head, abs_output_section,
290 (fill_type *) 0, (bfd_vma) 0);
294 /* Call the back-end function to set TOC base after we have placed all
297 gld${EMULATION_NAME}_after_allocation ()
299 if (!link_info.relocateable)
300 _bfd_set_gp_value (output_bfd, ppc64_elf_toc (output_bfd));
305 build_toc_list (statement)
306 lang_statement_union_type *statement;
308 if (statement->header.type == lang_input_section_enum
309 && !statement->input_section.ifile->just_syms_flag
310 && statement->input_section.section->output_section == toc_section)
312 ppc64_elf_next_toc_section (&link_info, statement->input_section.section);
318 build_section_lists (statement)
319 lang_statement_union_type *statement;
321 if (statement->header.type == lang_input_section_enum
322 && !statement->input_section.ifile->just_syms_flag
323 && statement->input_section.section->output_section != NULL
324 && statement->input_section.section->output_section->owner == output_bfd)
326 if (!ppc64_elf_next_input_section (&link_info,
327 statement->input_section.section))
328 einfo ("%X%P: can not size stub section: %E\n");
333 /* Final emulation specific call. */
336 gld${EMULATION_NAME}_finish ()
338 /* e_entry on PowerPC64 points to the function descriptor for
339 _start. If _start is missing, default to the first function
340 descriptor in the .opd section. */
341 entry_section = ".opd";
343 /* bfd_elf64_discard_info just plays with debugging sections,
344 ie. doesn't affect any code, so we can delay resizing the
345 sections. It's likely we'll resize everything in the process of
347 if (bfd_elf${ELFSIZE}_discard_info (output_bfd, &link_info))
350 /* If generating a relocatable output file, then we don't have any
352 if (stub_file != NULL && !link_info.relocateable)
354 int ret = ppc64_elf_setup_section_lists (output_bfd, &link_info);
359 einfo ("%X%P: can not size stub section: %E\n");
363 toc_section = bfd_get_section_by_name (output_bfd, ".toc");
364 if (toc_section != NULL)
365 lang_for_each_statement (build_toc_list);
367 ppc64_elf_reinit_toc (output_bfd, &link_info);
369 lang_for_each_statement (build_section_lists);
371 /* Call into the BFD backend to do the real work. */
372 if (!ppc64_elf_size_stubs (output_bfd,
376 &ppc_add_stub_section,
377 &ppc_layout_sections_again))
379 einfo ("%X%P: can not size stub section: %E\n");
386 ppc_layout_sections_again ();
388 if (stub_file != NULL && stub_file->the_bfd->sections != NULL)
390 if (!ppc64_elf_build_stubs (emit_stub_syms, &link_info))
391 einfo ("%X%P: can not build stubs: %E\n");
396 /* Add a pattern matching ".foo" for every "foo" in a version script.
398 The reason for doing this is that many shared library version
399 scripts export a selected set of functions or data symbols, forcing
404 . this; that; some; thing;
409 To make the above work for PowerPC64, we need to export ".this",
410 ".that" and so on, otherwise only the function descriptor syms are
411 exported. Lack of an exported function code sym may cause a
412 definition to be pulled in from a static library. */
414 struct bfd_elf_version_expr *
415 gld${EMULATION_NAME}_new_vers_pattern (entry)
416 struct bfd_elf_version_expr *entry;
418 struct bfd_elf_version_expr *dot_entry;
419 struct bfd_elf_version_expr *next;
423 if (!dotsyms || entry->pattern[0] == '*')
426 /* Is the script adding ".foo" explicitly? */
427 if (entry->pattern[0] == '.')
429 /* We may have added this pattern automatically. Don't add it
430 again. Quadratic behaviour here is acceptable as the list
431 may be traversed for each input bfd symbol. */
432 for (next = entry->next; next != NULL; next = next->next)
434 if (strcmp (next->pattern, entry->pattern) == 0
435 && next->match == entry->match)
438 free ((char *) entry->pattern);
446 /* Don't add ".foo" if the script has already done so. */
447 for (next = entry->next; next != NULL; next = next->next)
449 if (next->pattern[0] == '.'
450 && strcmp (next->pattern + 1, entry->pattern) == 0
451 && next->match == entry->match)
455 dot_entry = (struct bfd_elf_version_expr *) xmalloc (sizeof *dot_entry);
456 dot_entry->next = entry;
457 len = strlen (entry->pattern) + 2;
458 dot_pat = xmalloc (len);
460 memcpy (dot_pat + 1, entry->pattern, len - 1);
461 dot_entry->pattern = dot_pat;
462 dot_entry->match = entry->match;
467 /* Avoid processing the fake stub_file in vercheck, stat_needed and
468 check_needed routines. */
470 static void ppc_for_each_input_file_wrapper
471 PARAMS ((lang_input_statement_type *));
472 static void ppc_lang_for_each_input_file
473 PARAMS ((void (*) (lang_input_statement_type *)));
475 static void (*real_func) PARAMS ((lang_input_statement_type *));
477 static void ppc_for_each_input_file_wrapper (l)
478 lang_input_statement_type *l;
485 ppc_lang_for_each_input_file (func)
486 void (*func) PARAMS ((lang_input_statement_type *));
489 lang_for_each_input_file (&ppc_for_each_input_file_wrapper);
492 #define lang_for_each_input_file ppc_lang_for_each_input_file
496 # Define some shell vars to insert bits of code into the standard elf
497 # parse_args and list_options functions.
499 PARSE_AND_LIST_PROLOGUE='
500 #define OPTION_STUBGROUP_SIZE 301
501 #define OPTION_STUBSYMS (OPTION_STUBGROUP_SIZE + 1)
502 #define OPTION_DOTSYMS (OPTION_STUBSYMS + 1)
503 #define OPTION_NO_DOTSYMS (OPTION_DOTSYMS + 1)
504 #define OPTION_NO_TLS_OPT (OPTION_NO_DOTSYMS + 1)
507 PARSE_AND_LIST_LONGOPTS='
508 { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
509 { "emit-stub-syms", no_argument, NULL, OPTION_STUBSYMS },
510 { "dotsyms", no_argument, NULL, OPTION_DOTSYMS },
511 { "no-dotsyms", no_argument, NULL, OPTION_NO_DOTSYMS },
512 { "no-tls-optimize", no_argument, NULL, OPTION_NO_TLS_OPT },
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"
542 PARSE_AND_LIST_ARGS_CASES='
543 case OPTION_STUBGROUP_SIZE:
546 group_size = bfd_scan_vma (optarg, &end, 0);
548 einfo (_("%P%F: invalid number `%s'\''\n"), optarg);
552 case OPTION_STUBSYMS:
560 case OPTION_NO_DOTSYMS:
564 case OPTION_NO_TLS_OPT:
569 # Put these extra ppc64elf routines in ld_${EMULATION_NAME}_emulation
571 LDEMUL_AFTER_OPEN=ppc_after_open
572 LDEMUL_BEFORE_ALLOCATION=ppc_before_allocation
573 LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
574 LDEMUL_FINISH=gld${EMULATION_NAME}_finish
575 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=ppc_create_output_section_statements
576 LDEMUL_NEW_VERS_PATTERN=gld${EMULATION_NAME}_new_vers_pattern