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${EMULATION_NAME}.c <<EOF
28 #include "elf64-ppc.h"
30 /* Fake input file for stubs. */
31 static lang_input_statement_type *stub_file;
33 /* Whether we need to call ppc_layout_sections_again. */
34 static int need_laying_out = 0;
36 /* Maximum size of a group of input sections that can be handled by
37 one stub section. A value of +/-1 indicates the bfd back-end
38 should use a suitable default size. */
39 static bfd_signed_vma group_size = 1;
41 /* Whether to add ".foo" entries for each "foo" in a version script. */
42 static int dotsyms = 1;
44 static void ppc_create_output_section_statements
46 static void ppc_after_open
48 static void ppc_before_allocation
50 static asection *ppc_add_stub_section
51 PARAMS ((const char *, asection *));
52 static void ppc_layout_sections_again
54 static void gld${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 /* Size the sections. This is premature, but we want to know the
105 TLS segment layout so that certain optimizations can be done. */
106 lang_size_sections (stat_ptr->head, abs_output_section,
107 &stat_ptr->head, 0, (bfd_vma) 0, NULL);
109 if (!ppc64_elf_tls_optimize (output_bfd, &link_info))
111 einfo ("%X%P: TLS problem %E\n");
115 gld${EMULATION_NAME}_before_allocation ();
117 lang_reset_memory_regions ();
120 struct hook_stub_info
122 lang_statement_list_type add;
123 asection *input_section;
126 /* Traverse the linker tree to find the spot where the stub goes. */
128 static bfd_boolean hook_in_stub
129 PARAMS ((struct hook_stub_info *, lang_statement_union_type **));
132 hook_in_stub (info, lp)
133 struct hook_stub_info *info;
134 lang_statement_union_type **lp;
136 lang_statement_union_type *l;
139 for (; (l = *lp) != NULL; lp = &l->header.next)
141 switch (l->header.type)
143 case lang_constructors_statement_enum:
144 ret = hook_in_stub (info, &constructor_list.head);
149 case lang_output_section_statement_enum:
150 ret = hook_in_stub (info,
151 &l->output_section_statement.children.head);
156 case lang_wild_statement_enum:
157 ret = hook_in_stub (info, &l->wild_statement.children.head);
162 case lang_group_statement_enum:
163 ret = hook_in_stub (info, &l->group_statement.children.head);
168 case lang_input_section_enum:
169 if (l->input_section.section == info->input_section)
171 /* We've found our section. Insert the stub immediately
172 before its associated input section. */
173 *lp = info->add.head;
174 *(info->add.tail) = l;
179 case lang_data_statement_enum:
180 case lang_reloc_statement_enum:
181 case lang_object_symbols_statement_enum:
182 case lang_output_statement_enum:
183 case lang_target_statement_enum:
184 case lang_input_statement_enum:
185 case lang_assignment_statement_enum:
186 case lang_padding_statement_enum:
187 case lang_address_statement_enum:
188 case lang_fill_statement_enum:
200 /* Call-back for ppc64_elf_size_stubs. */
202 /* Create a new stub section, and arrange for it to be linked
203 immediately before INPUT_SECTION. */
206 ppc_add_stub_section (stub_sec_name, input_section)
207 const char *stub_sec_name;
208 asection *input_section;
212 asection *output_section;
214 lang_output_section_statement_type *os;
215 struct hook_stub_info info;
217 stub_sec = bfd_make_section_anyway (stub_file->the_bfd, stub_sec_name);
218 if (stub_sec == NULL)
221 flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
222 | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
223 if (!bfd_set_section_flags (stub_file->the_bfd, stub_sec, flags))
226 output_section = input_section->output_section;
227 secname = bfd_get_section_name (output_section->owner, output_section);
228 os = lang_output_section_find (secname);
230 info.input_section = input_section;
231 lang_list_init (&info.add);
232 lang_add_section (&info.add, stub_sec, os, stub_file);
234 if (info.add.head == NULL)
237 if (hook_in_stub (&info, &os->children.head))
241 einfo ("%X%P: can not make stub section: %E\n");
246 /* Another call-back for ppc64_elf_size_stubs. */
249 ppc_layout_sections_again ()
251 /* If we have changed sizes of the stub sections, then we need
252 to recalculate all the section offsets. This may mean we need to
253 add even more stubs. */
256 lang_reset_memory_regions ();
258 /* Resize the sections. */
259 lang_size_sections (stat_ptr->head, abs_output_section,
260 &stat_ptr->head, 0, (bfd_vma) 0, NULL);
262 /* Recalculate TOC base. */
263 ldemul_after_allocation ();
265 /* Do the assignments again. */
266 lang_do_assignments (stat_ptr->head, abs_output_section,
267 (fill_type *) 0, (bfd_vma) 0);
271 /* Call the back-end function to set TOC base after we have placed all
274 gld${EMULATION_NAME}_after_allocation ()
276 if (!link_info.relocateable)
277 _bfd_set_gp_value (output_bfd, ppc64_elf_toc (output_bfd));
282 build_section_lists (statement)
283 lang_statement_union_type *statement;
285 if (statement->header.type == lang_input_section_enum
286 && !statement->input_section.ifile->just_syms_flag
287 && statement->input_section.section->output_section != NULL
288 && statement->input_section.section->output_section->owner == output_bfd)
290 ppc64_elf_next_input_section (&link_info,
291 statement->input_section.section);
296 /* Final emulation specific call. */
299 gld${EMULATION_NAME}_finish ()
301 /* e_entry on PowerPC64 points to the function descriptor for
302 _start. If _start is missing, default to the first function
303 descriptor in the .opd section. */
304 entry_section = ".opd";
306 /* bfd_elf64_discard_info just plays with debugging sections,
307 ie. doesn't affect any code, so we can delay resizing the
308 sections. It's likely we'll resize everything in the process of
310 if (bfd_elf${ELFSIZE}_discard_info (output_bfd, &link_info))
313 /* If generating a relocatable output file, then we don't have any
315 if (!link_info.relocateable)
317 int ret = ppc64_elf_setup_section_lists (output_bfd, &link_info);
322 einfo ("%X%P: can not size stub section: %E\n");
326 lang_for_each_statement (build_section_lists);
328 /* Call into the BFD backend to do the real work. */
329 if (!ppc64_elf_size_stubs (output_bfd,
333 &ppc_add_stub_section,
334 &ppc_layout_sections_again))
336 einfo ("%X%P: can not size stub section: %E\n");
343 ppc_layout_sections_again ();
345 if (stub_file->the_bfd->sections != NULL)
347 if (!ppc64_elf_build_stubs (&link_info))
348 einfo ("%X%P: can not build stubs: %E\n");
353 /* Add a pattern matching ".foo" for every "foo" in a version script.
355 The reason for doing this is that many shared library version
356 scripts export a selected set of functions or data symbols, forcing
361 . this; that; some; thing;
366 To make the above work for PowerPC64, we need to export ".this",
367 ".that" and so on, otherwise only the function descriptor syms are
368 exported. Lack of an exported function code sym may cause a
369 definition to be pulled in from a static library. */
371 struct bfd_elf_version_expr *
372 gld${EMULATION_NAME}_new_vers_pattern (entry)
373 struct bfd_elf_version_expr *entry;
375 struct bfd_elf_version_expr *dot_entry;
376 struct bfd_elf_version_expr *next;
380 if (!dotsyms || entry->pattern[0] == '*')
383 /* Is the script adding ".foo" explicitly? */
384 if (entry->pattern[0] == '.')
386 /* We may have added this pattern automatically. Don't add it
387 again. Quadratic behaviour here is acceptable as the list
388 may be traversed for each input bfd symbol. */
389 for (next = entry->next; next != NULL; next = next->next)
391 if (strcmp (next->pattern, entry->pattern) == 0
392 && next->match == entry->match)
395 free ((char *) entry->pattern);
403 /* Don't add ".foo" if the script has already done so. */
404 for (next = entry->next; next != NULL; next = next->next)
406 if (next->pattern[0] == '.'
407 && strcmp (next->pattern + 1, entry->pattern) == 0
408 && next->match == entry->match)
412 dot_entry = (struct bfd_elf_version_expr *) xmalloc (sizeof *dot_entry);
413 dot_entry->next = entry;
414 len = strlen (entry->pattern) + 2;
415 dot_pat = xmalloc (len);
417 memcpy (dot_pat + 1, entry->pattern, len - 1);
418 dot_entry->pattern = dot_pat;
419 dot_entry->match = entry->match;
424 /* Avoid processing the fake stub_file in vercheck, stat_needed and
425 check_needed routines. */
427 static void ppc_for_each_input_file_wrapper
428 PARAMS ((lang_input_statement_type *));
429 static void ppc_lang_for_each_input_file
430 PARAMS ((void (*) (lang_input_statement_type *)));
432 static void (*real_func) PARAMS ((lang_input_statement_type *));
434 static void ppc_for_each_input_file_wrapper (l)
435 lang_input_statement_type *l;
442 ppc_lang_for_each_input_file (func)
443 void (*func) PARAMS ((lang_input_statement_type *));
446 lang_for_each_input_file (&ppc_for_each_input_file_wrapper);
449 #define lang_for_each_input_file ppc_lang_for_each_input_file
453 # Define some shell vars to insert bits of code into the standard elf
454 # parse_args and list_options functions.
456 PARSE_AND_LIST_PROLOGUE='
457 #define OPTION_STUBGROUP_SIZE 301
458 #define OPTION_DOTSYMS (OPTION_STUBGROUP_SIZE + 1)
459 #define OPTION_NO_DOTSYMS (OPTION_DOTSYMS + 1)
462 # The options are repeated below so that no abbreviations are allowed.
463 # Otherwise -s matches stub-group-size
464 PARSE_AND_LIST_LONGOPTS='
465 { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
466 { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
467 { "dotsyms", no_argument, NULL, OPTION_DOTSYMS },
468 { "dotsyms", no_argument, NULL, OPTION_DOTSYMS },
469 { "no-dotsyms", no_argument, NULL, OPTION_NO_DOTSYMS },
470 { "no-dotsyms", no_argument, NULL, OPTION_NO_DOTSYMS },
473 PARSE_AND_LIST_OPTIONS='
475 --stub-group-size=N Maximum size of a group of input sections that can be\n\
476 handled by one stub section. A negative value\n\
477 locates all stubs before their branches (with a\n\
478 group size of -N), while a positive value allows\n\
479 two groups of input sections, one before, and one\n\
480 after each stub section. Values of +/-1 indicate\n\
481 the linker should choose suitable defaults.\n"
484 --dotsyms For every version pattern \"foo\" in a version script,\n\
485 add \".foo\" so that function code symbols are\n\
486 treated the same as function descriptor symbols.\n\
490 --no-dotsyms Don'\''t do anything special in version scripts.\n"
494 PARSE_AND_LIST_ARGS_CASES='
495 case OPTION_STUBGROUP_SIZE:
498 group_size = bfd_scan_vma (optarg, &end, 0);
500 einfo (_("%P%F: invalid number `%s'\''\n"), optarg);
510 case OPTION_NO_DOTSYMS:
517 # Put these extra ppc64elf routines in ld_${EMULATION_NAME}_emulation
519 LDEMUL_AFTER_OPEN=ppc_after_open
520 LDEMUL_BEFORE_ALLOCATION=ppc_before_allocation
521 LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
522 LDEMUL_FINISH=gld${EMULATION_NAME}_finish
523 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=ppc_create_output_section_statements
524 LDEMUL_NEW_VERS_PATTERN=gld${EMULATION_NAME}_new_vers_pattern