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${EMULATION_NAME}_new_vers_pattern
62 PARAMS ((struct bfd_elf_version_expr *));
64 /* This is called before the input files are opened. We create a new
65 fake input file to hold the stub sections. */
68 ppc_create_output_section_statements ()
70 extern const bfd_target bfd_elf64_powerpc_vec;
71 extern const bfd_target bfd_elf64_powerpcle_vec;
73 if (link_info.hash->creator != &bfd_elf64_powerpc_vec
74 && link_info.hash->creator != &bfd_elf64_powerpcle_vec)
77 stub_file = lang_add_input_file ("linker stubs",
78 lang_input_file_is_fake_enum,
80 stub_file->the_bfd = bfd_create ("linker stubs", output_bfd);
81 if (stub_file->the_bfd == NULL
82 || !bfd_set_arch_mach (stub_file->the_bfd,
83 bfd_get_arch (output_bfd),
84 bfd_get_mach (output_bfd)))
86 einfo ("%X%P: can not create BFD %E\n");
90 ldlang_add_file (stub_file);
96 if (!ppc64_elf_mark_entry_syms (&link_info))
98 einfo ("%X%P: can not mark entry symbols %E\n");
102 gld${EMULATION_NAME}_after_open ();
106 ppc_before_allocation ()
108 if (stub_file != NULL)
110 if (!ppc64_elf_edit_opd (output_bfd, &link_info))
112 einfo ("%X%P: can not edit opd %E\n");
116 if (ppc64_elf_tls_setup (output_bfd, &link_info) && !notlsopt)
118 /* Size the sections. This is premature, but we want to know the
119 TLS segment layout so that certain optimizations can be done. */
120 lang_size_sections (stat_ptr->head, abs_output_section,
121 &stat_ptr->head, 0, (bfd_vma) 0, NULL, TRUE);
123 if (!ppc64_elf_tls_optimize (output_bfd, &link_info))
125 einfo ("%X%P: TLS problem %E\n");
129 lang_reset_memory_regions ();
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. */
144 static bfd_boolean hook_in_stub
145 PARAMS ((struct hook_stub_info *, lang_statement_union_type **));
148 hook_in_stub (info, lp)
149 struct hook_stub_info *info;
150 lang_statement_union_type **lp;
152 lang_statement_union_type *l;
155 for (; (l = *lp) != NULL; lp = &l->header.next)
157 switch (l->header.type)
159 case lang_constructors_statement_enum:
160 ret = hook_in_stub (info, &constructor_list.head);
165 case lang_output_section_statement_enum:
166 ret = hook_in_stub (info,
167 &l->output_section_statement.children.head);
172 case lang_wild_statement_enum:
173 ret = hook_in_stub (info, &l->wild_statement.children.head);
178 case lang_group_statement_enum:
179 ret = hook_in_stub (info, &l->group_statement.children.head);
184 case lang_input_section_enum:
185 if (l->input_section.section == info->input_section)
187 /* We've found our section. Insert the stub immediately
188 before its associated input section. */
189 *lp = info->add.head;
190 *(info->add.tail) = l;
195 case lang_data_statement_enum:
196 case lang_reloc_statement_enum:
197 case lang_object_symbols_statement_enum:
198 case lang_output_statement_enum:
199 case lang_target_statement_enum:
200 case lang_input_statement_enum:
201 case lang_assignment_statement_enum:
202 case lang_padding_statement_enum:
203 case lang_address_statement_enum:
204 case lang_fill_statement_enum:
216 /* Call-back for ppc64_elf_size_stubs. */
218 /* Create a new stub section, and arrange for it to be linked
219 immediately before INPUT_SECTION. */
222 ppc_add_stub_section (stub_sec_name, input_section)
223 const char *stub_sec_name;
224 asection *input_section;
228 asection *output_section;
230 lang_output_section_statement_type *os;
231 struct hook_stub_info info;
233 stub_sec = bfd_make_section_anyway (stub_file->the_bfd, stub_sec_name);
234 if (stub_sec == NULL)
237 flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
238 | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
239 if (!bfd_set_section_flags (stub_file->the_bfd, stub_sec, flags))
242 output_section = input_section->output_section;
243 secname = bfd_get_section_name (output_section->owner, output_section);
244 os = lang_output_section_find (secname);
246 info.input_section = input_section;
247 lang_list_init (&info.add);
248 lang_add_section (&info.add, stub_sec, os, stub_file);
250 if (info.add.head == NULL)
253 if (hook_in_stub (&info, &os->children.head))
257 einfo ("%X%P: can not make stub section: %E\n");
262 /* Another call-back for ppc64_elf_size_stubs. */
265 ppc_layout_sections_again ()
267 /* If we have changed sizes of the stub sections, then we need
268 to recalculate all the section offsets. This may mean we need to
269 add even more stubs. */
272 lang_reset_memory_regions ();
274 /* Resize the sections. */
275 lang_size_sections (stat_ptr->head, abs_output_section,
276 &stat_ptr->head, 0, (bfd_vma) 0, NULL, TRUE);
278 /* Recalculate TOC base. */
279 ldemul_after_allocation ();
281 /* Do the assignments again. */
282 lang_do_assignments (stat_ptr->head, abs_output_section,
283 (fill_type *) 0, (bfd_vma) 0);
287 /* Call the back-end function to set TOC base after we have placed all
290 gld${EMULATION_NAME}_after_allocation ()
292 if (!link_info.relocateable)
293 _bfd_set_gp_value (output_bfd, ppc64_elf_toc (output_bfd));
298 build_section_lists (statement)
299 lang_statement_union_type *statement;
301 if (statement->header.type == lang_input_section_enum
302 && !statement->input_section.ifile->just_syms_flag
303 && statement->input_section.section->output_section != NULL
304 && statement->input_section.section->output_section->owner == output_bfd)
306 ppc64_elf_next_input_section (&link_info,
307 statement->input_section.section);
312 /* Final emulation specific call. */
315 gld${EMULATION_NAME}_finish ()
317 /* e_entry on PowerPC64 points to the function descriptor for
318 _start. If _start is missing, default to the first function
319 descriptor in the .opd section. */
320 entry_section = ".opd";
322 /* bfd_elf64_discard_info just plays with debugging sections,
323 ie. doesn't affect any code, so we can delay resizing the
324 sections. It's likely we'll resize everything in the process of
326 if (bfd_elf${ELFSIZE}_discard_info (output_bfd, &link_info))
329 /* If generating a relocatable output file, then we don't have any
331 if (stub_file != NULL && !link_info.relocateable)
333 int ret = ppc64_elf_setup_section_lists (output_bfd, &link_info);
338 einfo ("%X%P: can not size stub section: %E\n");
342 lang_for_each_statement (build_section_lists);
344 /* Call into the BFD backend to do the real work. */
345 if (!ppc64_elf_size_stubs (output_bfd,
349 &ppc_add_stub_section,
350 &ppc_layout_sections_again))
352 einfo ("%X%P: can not size stub section: %E\n");
359 ppc_layout_sections_again ();
361 if (stub_file != NULL && stub_file->the_bfd->sections != NULL)
363 if (!ppc64_elf_build_stubs (&link_info))
364 einfo ("%X%P: can not build stubs: %E\n");
369 /* Add a pattern matching ".foo" for every "foo" in a version script.
371 The reason for doing this is that many shared library version
372 scripts export a selected set of functions or data symbols, forcing
377 . this; that; some; thing;
382 To make the above work for PowerPC64, we need to export ".this",
383 ".that" and so on, otherwise only the function descriptor syms are
384 exported. Lack of an exported function code sym may cause a
385 definition to be pulled in from a static library. */
387 struct bfd_elf_version_expr *
388 gld${EMULATION_NAME}_new_vers_pattern (entry)
389 struct bfd_elf_version_expr *entry;
391 struct bfd_elf_version_expr *dot_entry;
392 struct bfd_elf_version_expr *next;
396 if (!dotsyms || entry->pattern[0] == '*')
399 /* Is the script adding ".foo" explicitly? */
400 if (entry->pattern[0] == '.')
402 /* We may have added this pattern automatically. Don't add it
403 again. Quadratic behaviour here is acceptable as the list
404 may be traversed for each input bfd symbol. */
405 for (next = entry->next; next != NULL; next = next->next)
407 if (strcmp (next->pattern, entry->pattern) == 0
408 && next->match == entry->match)
411 free ((char *) entry->pattern);
419 /* Don't add ".foo" if the script has already done so. */
420 for (next = entry->next; next != NULL; next = next->next)
422 if (next->pattern[0] == '.'
423 && strcmp (next->pattern + 1, entry->pattern) == 0
424 && next->match == entry->match)
428 dot_entry = (struct bfd_elf_version_expr *) xmalloc (sizeof *dot_entry);
429 dot_entry->next = entry;
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;
435 dot_entry->match = entry->match;
440 /* Avoid processing the fake stub_file in vercheck, stat_needed and
441 check_needed routines. */
443 static void ppc_for_each_input_file_wrapper
444 PARAMS ((lang_input_statement_type *));
445 static void ppc_lang_for_each_input_file
446 PARAMS ((void (*) (lang_input_statement_type *)));
448 static void (*real_func) PARAMS ((lang_input_statement_type *));
450 static void ppc_for_each_input_file_wrapper (l)
451 lang_input_statement_type *l;
458 ppc_lang_for_each_input_file (func)
459 void (*func) PARAMS ((lang_input_statement_type *));
462 lang_for_each_input_file (&ppc_for_each_input_file_wrapper);
465 #define lang_for_each_input_file ppc_lang_for_each_input_file
469 # Define some shell vars to insert bits of code into the standard elf
470 # parse_args and list_options functions.
472 PARSE_AND_LIST_PROLOGUE='
473 #define OPTION_STUBGROUP_SIZE 301
474 #define OPTION_DOTSYMS (OPTION_STUBGROUP_SIZE + 1)
475 #define OPTION_NO_DOTSYMS (OPTION_DOTSYMS + 1)
476 #define OPTION_NO_TLS_OPT (OPTION_NO_DOTSYMS + 1)
479 # The options are repeated below so that no abbreviations are allowed.
480 # Otherwise -s matches stub-group-size
481 PARSE_AND_LIST_LONGOPTS='
482 { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
483 { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
484 { "dotsyms", no_argument, NULL, OPTION_DOTSYMS },
485 { "dotsyms", no_argument, NULL, OPTION_DOTSYMS },
486 { "no-dotsyms", no_argument, NULL, OPTION_NO_DOTSYMS },
487 { "no-dotsyms", no_argument, NULL, OPTION_NO_DOTSYMS },
488 { "no-tls-optimize", no_argument, NULL, OPTION_NO_TLS_OPT },
489 { "no-tls-optimize", no_argument, NULL, OPTION_NO_TLS_OPT },
492 PARSE_AND_LIST_OPTIONS='
494 --stub-group-size=N Maximum size of a group of input sections that can be\n\
495 handled by one stub section. A negative value\n\
496 locates all stubs before their branches (with a\n\
497 group size of -N), while a positive value allows\n\
498 two groups of input sections, one before, and one\n\
499 after each stub section. Values of +/-1 indicate\n\
500 the linker should choose suitable defaults.\n"
503 --dotsyms For every version pattern \"foo\" in a version script,\n\
504 add \".foo\" so that function code symbols are\n\
505 treated the same as function descriptor symbols.\n\
509 --no-dotsyms Don'\''t do anything special in version scripts.\n"
512 --no-tls-optimize Don'\''t try to optimize TLS accesses.\n"
516 PARSE_AND_LIST_ARGS_CASES='
517 case OPTION_STUBGROUP_SIZE:
520 group_size = bfd_scan_vma (optarg, &end, 0);
522 einfo (_("%P%F: invalid number `%s'\''\n"), optarg);
530 case OPTION_NO_DOTSYMS:
534 case OPTION_NO_TLS_OPT:
539 # Put these extra ppc64elf routines in ld_${EMULATION_NAME}_emulation
541 LDEMUL_AFTER_OPEN=ppc_after_open
542 LDEMUL_BEFORE_ALLOCATION=ppc_before_allocation
543 LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
544 LDEMUL_FINISH=gld${EMULATION_NAME}_finish
545 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=ppc_create_output_section_statements
546 LDEMUL_NEW_VERS_PATTERN=gld${EMULATION_NAME}_new_vers_pattern