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${EMULATION_NAME}.c <<EOF
28 #include "elf64-ppc.h"
30 /* Fake input file for stubs. */
31 static lang_input_statement_type *stub_file;
33 /* Whether we need to call ppc_layout_sections_again. */
34 static int need_laying_out = 0;
36 /* Maximum size of a group of input sections that can be handled by
37 one stub section. A value of +/-1 indicates the bfd back-end
38 should use a suitable default size. */
39 static bfd_signed_vma group_size = 1;
41 /* Whether to add ".foo" entries for each "foo" in a version script. */
42 static int dotsyms = 1;
44 /* Whether to run tls optimization. */
45 static int notlsopt = 0;
47 static void ppc_create_output_section_statements
49 static void ppc_after_open
51 static void ppc_before_allocation
53 static asection *ppc_add_stub_section
54 PARAMS ((const char *, asection *));
55 static void ppc_layout_sections_again
57 static void gld${EMULATION_NAME}_after_allocation
59 static void build_section_lists
60 PARAMS ((lang_statement_union_type *));
61 static struct bfd_elf_version_expr *gld${EMULATION_NAME}_new_vers_pattern
62 PARAMS ((struct bfd_elf_version_expr *));
64 /* This is called before the input files are opened. We create a new
65 fake input file to hold the stub sections. */
68 ppc_create_output_section_statements ()
70 stub_file = lang_add_input_file ("linker stubs",
71 lang_input_file_is_fake_enum,
73 stub_file->the_bfd = bfd_create ("linker stubs", output_bfd);
74 if (stub_file->the_bfd == NULL
75 || !bfd_set_arch_mach (stub_file->the_bfd,
76 bfd_get_arch (output_bfd),
77 bfd_get_mach (output_bfd)))
79 einfo ("%X%P: can not create BFD %E\n");
83 ldlang_add_file (stub_file);
89 if (!ppc64_elf_mark_entry_syms (&link_info))
91 einfo ("%X%P: can not mark entry symbols %E\n");
95 gld${EMULATION_NAME}_after_open ();
99 ppc_before_allocation ()
101 if (!ppc64_elf_edit_opd (output_bfd, &link_info))
103 einfo ("%X%P: can not edit opd %E\n");
107 if (ppc64_elf_tls_setup (output_bfd, &link_info) && !notlsopt)
109 /* Size the sections. This is premature, but we want to know the
110 TLS segment layout so that certain optimizations can be done. */
111 lang_size_sections (stat_ptr->head, abs_output_section,
112 &stat_ptr->head, 0, (bfd_vma) 0, NULL);
114 if (!ppc64_elf_tls_optimize (output_bfd, &link_info))
116 einfo ("%X%P: TLS problem %E\n");
120 lang_reset_memory_regions ();
123 gld${EMULATION_NAME}_before_allocation ();
126 struct hook_stub_info
128 lang_statement_list_type add;
129 asection *input_section;
132 /* Traverse the linker tree to find the spot where the stub goes. */
134 static bfd_boolean hook_in_stub
135 PARAMS ((struct hook_stub_info *, lang_statement_union_type **));
138 hook_in_stub (info, lp)
139 struct hook_stub_info *info;
140 lang_statement_union_type **lp;
142 lang_statement_union_type *l;
145 for (; (l = *lp) != NULL; lp = &l->header.next)
147 switch (l->header.type)
149 case lang_constructors_statement_enum:
150 ret = hook_in_stub (info, &constructor_list.head);
155 case lang_output_section_statement_enum:
156 ret = hook_in_stub (info,
157 &l->output_section_statement.children.head);
162 case lang_wild_statement_enum:
163 ret = hook_in_stub (info, &l->wild_statement.children.head);
168 case lang_group_statement_enum:
169 ret = hook_in_stub (info, &l->group_statement.children.head);
174 case lang_input_section_enum:
175 if (l->input_section.section == info->input_section)
177 /* We've found our section. Insert the stub immediately
178 before its associated input section. */
179 *lp = info->add.head;
180 *(info->add.tail) = l;
185 case lang_data_statement_enum:
186 case lang_reloc_statement_enum:
187 case lang_object_symbols_statement_enum:
188 case lang_output_statement_enum:
189 case lang_target_statement_enum:
190 case lang_input_statement_enum:
191 case lang_assignment_statement_enum:
192 case lang_padding_statement_enum:
193 case lang_address_statement_enum:
194 case lang_fill_statement_enum:
206 /* Call-back for ppc64_elf_size_stubs. */
208 /* Create a new stub section, and arrange for it to be linked
209 immediately before INPUT_SECTION. */
212 ppc_add_stub_section (stub_sec_name, input_section)
213 const char *stub_sec_name;
214 asection *input_section;
218 asection *output_section;
220 lang_output_section_statement_type *os;
221 struct hook_stub_info info;
223 stub_sec = bfd_make_section_anyway (stub_file->the_bfd, stub_sec_name);
224 if (stub_sec == NULL)
227 flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
228 | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
229 if (!bfd_set_section_flags (stub_file->the_bfd, stub_sec, flags))
232 output_section = input_section->output_section;
233 secname = bfd_get_section_name (output_section->owner, output_section);
234 os = lang_output_section_find (secname);
236 info.input_section = input_section;
237 lang_list_init (&info.add);
238 lang_add_section (&info.add, stub_sec, os, stub_file);
240 if (info.add.head == NULL)
243 if (hook_in_stub (&info, &os->children.head))
247 einfo ("%X%P: can not make stub section: %E\n");
252 /* Another call-back for ppc64_elf_size_stubs. */
255 ppc_layout_sections_again ()
257 /* If we have changed sizes of the stub sections, then we need
258 to recalculate all the section offsets. This may mean we need to
259 add even more stubs. */
262 lang_reset_memory_regions ();
264 /* Resize the sections. */
265 lang_size_sections (stat_ptr->head, abs_output_section,
266 &stat_ptr->head, 0, (bfd_vma) 0, NULL);
268 /* Recalculate TOC base. */
269 ldemul_after_allocation ();
271 /* Do the assignments again. */
272 lang_do_assignments (stat_ptr->head, abs_output_section,
273 (fill_type *) 0, (bfd_vma) 0);
277 /* Call the back-end function to set TOC base after we have placed all
280 gld${EMULATION_NAME}_after_allocation ()
282 if (!link_info.relocateable)
283 _bfd_set_gp_value (output_bfd, ppc64_elf_toc (output_bfd));
288 build_section_lists (statement)
289 lang_statement_union_type *statement;
291 if (statement->header.type == lang_input_section_enum
292 && !statement->input_section.ifile->just_syms_flag
293 && statement->input_section.section->output_section != NULL
294 && statement->input_section.section->output_section->owner == output_bfd)
296 ppc64_elf_next_input_section (&link_info,
297 statement->input_section.section);
302 /* Final emulation specific call. */
305 gld${EMULATION_NAME}_finish ()
307 /* e_entry on PowerPC64 points to the function descriptor for
308 _start. If _start is missing, default to the first function
309 descriptor in the .opd section. */
310 entry_section = ".opd";
312 /* bfd_elf64_discard_info just plays with debugging sections,
313 ie. doesn't affect any code, so we can delay resizing the
314 sections. It's likely we'll resize everything in the process of
316 if (bfd_elf${ELFSIZE}_discard_info (output_bfd, &link_info))
319 /* If generating a relocatable output file, then we don't have any
321 if (!link_info.relocateable)
323 int ret = ppc64_elf_setup_section_lists (output_bfd, &link_info);
328 einfo ("%X%P: can not size stub section: %E\n");
332 lang_for_each_statement (build_section_lists);
334 /* Call into the BFD backend to do the real work. */
335 if (!ppc64_elf_size_stubs (output_bfd,
339 &ppc_add_stub_section,
340 &ppc_layout_sections_again))
342 einfo ("%X%P: can not size stub section: %E\n");
349 ppc_layout_sections_again ();
351 if (stub_file->the_bfd->sections != NULL)
353 if (!ppc64_elf_build_stubs (&link_info))
354 einfo ("%X%P: can not build stubs: %E\n");
359 /* Add a pattern matching ".foo" for every "foo" in a version script.
361 The reason for doing this is that many shared library version
362 scripts export a selected set of functions or data symbols, forcing
367 . this; that; some; thing;
372 To make the above work for PowerPC64, we need to export ".this",
373 ".that" and so on, otherwise only the function descriptor syms are
374 exported. Lack of an exported function code sym may cause a
375 definition to be pulled in from a static library. */
377 struct bfd_elf_version_expr *
378 gld${EMULATION_NAME}_new_vers_pattern (entry)
379 struct bfd_elf_version_expr *entry;
381 struct bfd_elf_version_expr *dot_entry;
382 struct bfd_elf_version_expr *next;
386 if (!dotsyms || entry->pattern[0] == '*')
389 /* Is the script adding ".foo" explicitly? */
390 if (entry->pattern[0] == '.')
392 /* We may have added this pattern automatically. Don't add it
393 again. Quadratic behaviour here is acceptable as the list
394 may be traversed for each input bfd symbol. */
395 for (next = entry->next; next != NULL; next = next->next)
397 if (strcmp (next->pattern, entry->pattern) == 0
398 && next->match == entry->match)
401 free ((char *) entry->pattern);
409 /* Don't add ".foo" if the script has already done so. */
410 for (next = entry->next; next != NULL; next = next->next)
412 if (next->pattern[0] == '.'
413 && strcmp (next->pattern + 1, entry->pattern) == 0
414 && next->match == entry->match)
418 dot_entry = (struct bfd_elf_version_expr *) xmalloc (sizeof *dot_entry);
419 dot_entry->next = entry;
420 len = strlen (entry->pattern) + 2;
421 dot_pat = xmalloc (len);
423 memcpy (dot_pat + 1, entry->pattern, len - 1);
424 dot_entry->pattern = dot_pat;
425 dot_entry->match = entry->match;
430 /* Avoid processing the fake stub_file in vercheck, stat_needed and
431 check_needed routines. */
433 static void ppc_for_each_input_file_wrapper
434 PARAMS ((lang_input_statement_type *));
435 static void ppc_lang_for_each_input_file
436 PARAMS ((void (*) (lang_input_statement_type *)));
438 static void (*real_func) PARAMS ((lang_input_statement_type *));
440 static void ppc_for_each_input_file_wrapper (l)
441 lang_input_statement_type *l;
448 ppc_lang_for_each_input_file (func)
449 void (*func) PARAMS ((lang_input_statement_type *));
452 lang_for_each_input_file (&ppc_for_each_input_file_wrapper);
455 #define lang_for_each_input_file ppc_lang_for_each_input_file
459 # Define some shell vars to insert bits of code into the standard elf
460 # parse_args and list_options functions.
462 PARSE_AND_LIST_PROLOGUE='
463 #define OPTION_STUBGROUP_SIZE 301
464 #define OPTION_DOTSYMS (OPTION_STUBGROUP_SIZE + 1)
465 #define OPTION_NO_DOTSYMS (OPTION_DOTSYMS + 1)
466 #define OPTION_NO_TLS_OPT (OPTION_NO_DOTSYMS + 1)
469 # The options are repeated below so that no abbreviations are allowed.
470 # Otherwise -s matches stub-group-size
471 PARSE_AND_LIST_LONGOPTS='
472 { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
473 { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
474 { "dotsyms", no_argument, NULL, OPTION_DOTSYMS },
475 { "dotsyms", no_argument, NULL, OPTION_DOTSYMS },
476 { "no-dotsyms", no_argument, NULL, OPTION_NO_DOTSYMS },
477 { "no-dotsyms", no_argument, NULL, OPTION_NO_DOTSYMS },
478 { "no-tls-optimize", no_argument, NULL, OPTION_NO_TLS_OPT },
479 { "no-tls-optimize", no_argument, NULL, OPTION_NO_TLS_OPT },
482 PARSE_AND_LIST_OPTIONS='
484 --stub-group-size=N Maximum size of a group of input sections that can be\n\
485 handled by one stub section. A negative value\n\
486 locates all stubs before their branches (with a\n\
487 group size of -N), while a positive value allows\n\
488 two groups of input sections, one before, and one\n\
489 after each stub section. Values of +/-1 indicate\n\
490 the linker should choose suitable defaults.\n"
493 --dotsyms For every version pattern \"foo\" in a version script,\n\
494 add \".foo\" so that function code symbols are\n\
495 treated the same as function descriptor symbols.\n\
499 --no-dotsyms Don'\''t do anything special in version scripts.\n"
502 --no-tls-optimize Don'\''t try to optimize TLS accesses.\n"
506 PARSE_AND_LIST_ARGS_CASES='
507 case OPTION_STUBGROUP_SIZE:
510 group_size = bfd_scan_vma (optarg, &end, 0);
512 einfo (_("%P%F: invalid number `%s'\''\n"), optarg);
520 case OPTION_NO_DOTSYMS:
524 case OPTION_NO_TLS_OPT:
529 # Put these extra ppc64elf routines in ld_${EMULATION_NAME}_emulation
531 LDEMUL_AFTER_OPEN=ppc_after_open
532 LDEMUL_BEFORE_ALLOCATION=ppc_before_allocation
533 LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
534 LDEMUL_FINISH=gld${EMULATION_NAME}_finish
535 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=ppc_create_output_section_statements
536 LDEMUL_NEW_VERS_PATTERN=gld${EMULATION_NAME}_new_vers_pattern