1 # This shell script emits a C file. -*- C -*-
2 # Copyright 2002 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${EMULATION_NAME}.c <<EOF
28 #include "elf64-ppc.h"
30 /* Fake input file for stubs. */
31 static lang_input_statement_type *stub_file;
33 /* Whether we need to call ppc_layout_sections_again. */
34 static int need_laying_out = 0;
36 /* Maximum size of a group of input sections that can be handled by
37 one stub section. A value of +/-1 indicates the bfd back-end
38 should use a suitable default size. */
39 static bfd_signed_vma group_size = 1;
41 /* Whether to add ".foo" entries for each "foo" in a version script. */
42 static int dotsyms = 1;
44 static void ppc_create_output_section_statements
46 static void ppc_after_open
48 static void ppc_before_allocation
50 static asection *ppc_add_stub_section
51 PARAMS ((const char *, asection *));
52 static void ppc_layout_sections_again
54 static void gld${EMULATION_NAME}_after_allocation
56 static void build_section_lists
57 PARAMS ((lang_statement_union_type *));
58 static struct bfd_elf_version_expr *gld${EMULATION_NAME}_new_vers_pattern
59 PARAMS ((struct bfd_elf_version_expr *));
61 /* This is called before the input files are opened. We create a new
62 fake input file to hold the stub sections. */
65 ppc_create_output_section_statements ()
67 stub_file = lang_add_input_file ("linker stubs",
68 lang_input_file_is_fake_enum,
70 stub_file->the_bfd = bfd_create ("linker stubs", output_bfd);
71 if (stub_file->the_bfd == NULL
72 || !bfd_set_arch_mach (stub_file->the_bfd,
73 bfd_get_arch (output_bfd),
74 bfd_get_mach (output_bfd)))
76 einfo ("%X%P: can not create BFD %E\n");
80 ldlang_add_file (stub_file);
86 if (!ppc64_elf_mark_entry_syms (&link_info))
88 einfo ("%X%P: can not mark entry symbols %E\n");
92 gld${EMULATION_NAME}_after_open ();
96 ppc_before_allocation ()
98 if (!ppc64_elf_edit_opd (output_bfd, &link_info))
100 einfo ("%X%P: can not edit opd %E\n");
104 gld${EMULATION_NAME}_before_allocation ();
107 struct hook_stub_info
109 lang_statement_list_type add;
110 asection *input_section;
113 /* Traverse the linker tree to find the spot where the stub goes. */
115 static bfd_boolean hook_in_stub
116 PARAMS ((struct hook_stub_info *, lang_statement_union_type **));
119 hook_in_stub (info, lp)
120 struct hook_stub_info *info;
121 lang_statement_union_type **lp;
123 lang_statement_union_type *l;
126 for (; (l = *lp) != NULL; lp = &l->header.next)
128 switch (l->header.type)
130 case lang_constructors_statement_enum:
131 ret = hook_in_stub (info, &constructor_list.head);
136 case lang_output_section_statement_enum:
137 ret = hook_in_stub (info,
138 &l->output_section_statement.children.head);
143 case lang_wild_statement_enum:
144 ret = hook_in_stub (info, &l->wild_statement.children.head);
149 case lang_group_statement_enum:
150 ret = hook_in_stub (info, &l->group_statement.children.head);
155 case lang_input_section_enum:
156 if (l->input_section.section == info->input_section)
158 /* We've found our section. Insert the stub immediately
159 before its associated input section. */
160 *lp = info->add.head;
161 *(info->add.tail) = l;
166 case lang_data_statement_enum:
167 case lang_reloc_statement_enum:
168 case lang_object_symbols_statement_enum:
169 case lang_output_statement_enum:
170 case lang_target_statement_enum:
171 case lang_input_statement_enum:
172 case lang_assignment_statement_enum:
173 case lang_padding_statement_enum:
174 case lang_address_statement_enum:
175 case lang_fill_statement_enum:
187 /* Call-back for ppc64_elf_size_stubs. */
189 /* Create a new stub section, and arrange for it to be linked
190 immediately before INPUT_SECTION. */
193 ppc_add_stub_section (stub_sec_name, input_section)
194 const char *stub_sec_name;
195 asection *input_section;
199 asection *output_section;
201 lang_output_section_statement_type *os;
202 struct hook_stub_info info;
204 stub_sec = bfd_make_section_anyway (stub_file->the_bfd, stub_sec_name);
205 if (stub_sec == NULL)
208 flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
209 | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
210 if (!bfd_set_section_flags (stub_file->the_bfd, stub_sec, flags))
213 output_section = input_section->output_section;
214 secname = bfd_get_section_name (output_section->owner, output_section);
215 os = lang_output_section_find (secname);
217 info.input_section = input_section;
218 lang_list_init (&info.add);
219 lang_add_section (&info.add, stub_sec, os, stub_file);
221 if (info.add.head == NULL)
224 if (hook_in_stub (&info, &os->children.head))
228 einfo ("%X%P: can not make stub section: %E\n");
233 /* Another call-back for ppc64_elf_size_stubs. */
236 ppc_layout_sections_again ()
238 /* If we have changed sizes of the stub sections, then we need
239 to recalculate all the section offsets. This may mean we need to
240 add even more stubs. */
243 lang_reset_memory_regions ();
245 /* Resize the sections. */
246 lang_size_sections (stat_ptr->head, abs_output_section,
247 &stat_ptr->head, 0, (bfd_vma) 0, NULL);
249 /* Recalculate TOC base. */
250 ldemul_after_allocation ();
252 /* Do the assignments again. */
253 lang_do_assignments (stat_ptr->head, abs_output_section,
254 (fill_type *) 0, (bfd_vma) 0);
258 /* Call the back-end function to set TOC base after we have placed all
261 gld${EMULATION_NAME}_after_allocation ()
263 if (!link_info.relocateable)
264 _bfd_set_gp_value (output_bfd, ppc64_elf_toc (output_bfd));
269 build_section_lists (statement)
270 lang_statement_union_type *statement;
272 if (statement->header.type == lang_input_section_enum
273 && !statement->input_section.ifile->just_syms_flag
274 && statement->input_section.section->output_section != NULL
275 && statement->input_section.section->output_section->owner == output_bfd)
277 ppc64_elf_next_input_section (&link_info,
278 statement->input_section.section);
283 /* Final emulation specific call. */
286 gld${EMULATION_NAME}_finish ()
288 /* e_entry on PowerPC64 points to the function descriptor for
289 _start. If _start is missing, default to the first function
290 descriptor in the .opd section. */
291 entry_section = ".opd";
293 /* bfd_elf64_discard_info just plays with debugging sections,
294 ie. doesn't affect any code, so we can delay resizing the
295 sections. It's likely we'll resize everything in the process of
297 if (bfd_elf${ELFSIZE}_discard_info (output_bfd, &link_info))
300 /* If generating a relocatable output file, then we don't have any
302 if (!link_info.relocateable)
304 int ret = ppc64_elf_setup_section_lists (output_bfd, &link_info);
309 einfo ("%X%P: can not size stub section: %E\n");
313 lang_for_each_statement (build_section_lists);
315 /* Call into the BFD backend to do the real work. */
316 if (!ppc64_elf_size_stubs (output_bfd,
320 &ppc_add_stub_section,
321 &ppc_layout_sections_again))
323 einfo ("%X%P: can not size stub section: %E\n");
330 ppc_layout_sections_again ();
332 if (stub_file->the_bfd->sections != NULL)
334 if (!ppc64_elf_build_stubs (&link_info))
335 einfo ("%X%P: can not build stubs: %E\n");
340 /* Add a pattern matching ".foo" for every "foo" in a version script.
342 The reason for doing this is that many shared library version
343 scripts export a selected set of functions or data symbols, forcing
348 . this; that; some; thing;
353 To make the above work for PowerPC64, we need to export ".this",
354 ".that" and so on, otherwise only the function descriptor syms are
355 exported. Lack of an exported function code sym may cause a
356 definition to be pulled in from a static library. */
358 struct bfd_elf_version_expr *
359 gld${EMULATION_NAME}_new_vers_pattern (entry)
360 struct bfd_elf_version_expr *entry;
362 struct bfd_elf_version_expr *dot_entry;
363 struct bfd_elf_version_expr *next;
367 if (!dotsyms || entry->pattern[0] == '*')
370 /* Is the script adding ".foo" explicitly? */
371 if (entry->pattern[0] == '.')
373 /* We may have added this pattern automatically. Don't add it
374 again. Quadratic behaviour here is acceptable as the list
375 may be traversed for each input bfd symbol. */
376 for (next = entry->next; next != NULL; next = next->next)
378 if (strcmp (next->pattern, entry->pattern) == 0
379 && next->match == entry->match)
382 free ((char *) entry->pattern);
390 /* Don't add ".foo" if the script has already done so. */
391 for (next = entry->next; next != NULL; next = next->next)
393 if (next->pattern[0] == '.'
394 && strcmp (next->pattern + 1, entry->pattern) == 0
395 && next->match == entry->match)
399 dot_entry = (struct bfd_elf_version_expr *) xmalloc (sizeof *dot_entry);
400 dot_entry->next = entry;
401 len = strlen (entry->pattern) + 2;
402 dot_pat = xmalloc (len);
404 memcpy (dot_pat + 1, entry->pattern, len - 1);
405 dot_entry->pattern = dot_pat;
406 dot_entry->match = entry->match;
411 /* Avoid processing the fake stub_file in vercheck, stat_needed and
412 check_needed routines. */
414 static void ppc_for_each_input_file_wrapper
415 PARAMS ((lang_input_statement_type *));
416 static void ppc_lang_for_each_input_file
417 PARAMS ((void (*) (lang_input_statement_type *)));
419 static void (*real_func) PARAMS ((lang_input_statement_type *));
421 static void ppc_for_each_input_file_wrapper (l)
422 lang_input_statement_type *l;
429 ppc_lang_for_each_input_file (func)
430 void (*func) PARAMS ((lang_input_statement_type *));
433 lang_for_each_input_file (&ppc_for_each_input_file_wrapper);
436 #define lang_for_each_input_file ppc_lang_for_each_input_file
440 # Define some shell vars to insert bits of code into the standard elf
441 # parse_args and list_options functions.
443 PARSE_AND_LIST_PROLOGUE='
444 #define OPTION_STUBGROUP_SIZE 301
445 #define OPTION_DOTSYMS (OPTION_STUBGROUP_SIZE + 1)
446 #define OPTION_NO_DOTSYMS (OPTION_DOTSYMS + 1)
449 # The options are repeated below so that no abbreviations are allowed.
450 # Otherwise -s matches stub-group-size
451 PARSE_AND_LIST_LONGOPTS='
452 { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
453 { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
454 { "dotsyms", no_argument, NULL, OPTION_DOTSYMS },
455 { "dotsyms", no_argument, NULL, OPTION_DOTSYMS },
456 { "no-dotsyms", no_argument, NULL, OPTION_NO_DOTSYMS },
457 { "no-dotsyms", no_argument, NULL, OPTION_NO_DOTSYMS },
460 PARSE_AND_LIST_OPTIONS='
462 --stub-group-size=N Maximum size of a group of input sections that can be\n\
463 handled by one stub section. A negative value\n\
464 locates all stubs before their branches (with a\n\
465 group size of -N), while a positive value allows\n\
466 two groups of input sections, one before, and one\n\
467 after each stub section. Values of +/-1 indicate\n\
468 the linker should choose suitable defaults.\n"
471 --dotsyms For every version pattern \"foo\" in a version script,\n\
472 add \".foo\" so that function code symbols are\n\
473 treated the same as function descriptor symbols.\n\
477 --no-dotsyms Don'\''t do anything special in version scripts.\n"
481 PARSE_AND_LIST_ARGS_CASES='
482 case OPTION_STUBGROUP_SIZE:
485 group_size = bfd_scan_vma (optarg, &end, 0);
487 einfo (_("%P%F: invalid number `%s'\''\n"), optarg);
497 case OPTION_NO_DOTSYMS:
504 # Put these extra ppc64elf routines in ld_${EMULATION_NAME}_emulation
506 LDEMUL_AFTER_OPEN=ppc_after_open
507 LDEMUL_BEFORE_ALLOCATION=ppc_before_allocation
508 LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
509 LDEMUL_FINISH=gld${EMULATION_NAME}_finish
510 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=ppc_create_output_section_statements
511 LDEMUL_NEW_VERS_PATTERN=gld${EMULATION_NAME}_new_vers_pattern