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${EMULATION_NAME}.c <<EOF
28 #include "elf64-ppc.h"
30 /* Fake input file for stubs. */
31 static lang_input_statement_type *stub_file;
33 /* Whether we need to call ppc_layout_sections_again. */
34 static int need_laying_out = 0;
36 /* Maximum size of a group of input sections that can be handled by
37 one stub section. A value of +/-1 indicates the bfd back-end
38 should use a suitable default size. */
39 static bfd_signed_vma group_size = 1;
41 static void ppc_create_output_section_statements PARAMS ((void));
42 static asection *ppc_add_stub_section PARAMS ((const char *, asection *));
43 static void ppc_layout_sections_again PARAMS ((void));
44 static void gld${EMULATION_NAME}_after_allocation PARAMS ((void));
45 static void build_section_lists PARAMS ((lang_statement_union_type *));
47 /* This is called before the input files are opened. We create a new
48 fake input file to hold the stub sections. */
51 ppc_create_output_section_statements ()
53 stub_file = lang_add_input_file ("linker stubs",
54 lang_input_file_is_fake_enum,
56 stub_file->the_bfd = bfd_create ("linker stubs", output_bfd);
57 if (stub_file->the_bfd == NULL
58 || !bfd_set_arch_mach (stub_file->the_bfd,
59 bfd_get_arch (output_bfd),
60 bfd_get_mach (output_bfd)))
62 einfo ("%X%P: can not create BFD %E\n");
66 ldlang_add_file (stub_file);
72 lang_statement_list_type add;
73 asection *input_section;
76 /* Traverse the linker tree to find the spot where the stub goes. */
78 static boolean hook_in_stub
79 PARAMS ((struct hook_stub_info *, lang_statement_union_type **));
82 hook_in_stub (info, lp)
83 struct hook_stub_info *info;
84 lang_statement_union_type **lp;
86 lang_statement_union_type *l;
89 for (; (l = *lp) != NULL; lp = &l->header.next)
91 switch (l->header.type)
93 case lang_constructors_statement_enum:
94 ret = hook_in_stub (info, &constructor_list.head);
99 case lang_output_section_statement_enum:
100 ret = hook_in_stub (info,
101 &l->output_section_statement.children.head);
106 case lang_wild_statement_enum:
107 ret = hook_in_stub (info, &l->wild_statement.children.head);
112 case lang_group_statement_enum:
113 ret = hook_in_stub (info, &l->group_statement.children.head);
118 case lang_input_section_enum:
119 if (l->input_section.section == info->input_section)
121 /* We've found our section. Insert the stub immediately
122 before its associated input section. */
123 *lp = info->add.head;
124 *(info->add.tail) = l;
129 case lang_data_statement_enum:
130 case lang_reloc_statement_enum:
131 case lang_object_symbols_statement_enum:
132 case lang_output_statement_enum:
133 case lang_target_statement_enum:
134 case lang_input_statement_enum:
135 case lang_assignment_statement_enum:
136 case lang_padding_statement_enum:
137 case lang_address_statement_enum:
138 case lang_fill_statement_enum:
150 /* Call-back for ppc64_elf_size_stubs. */
152 /* Create a new stub section, and arrange for it to be linked
153 immediately before INPUT_SECTION. */
156 ppc_add_stub_section (stub_sec_name, input_section)
157 const char *stub_sec_name;
158 asection *input_section;
162 asection *output_section;
164 lang_output_section_statement_type *os;
165 struct hook_stub_info info;
167 stub_sec = bfd_make_section_anyway (stub_file->the_bfd, stub_sec_name);
168 if (stub_sec == NULL)
171 flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
172 | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
173 if (!bfd_set_section_flags (stub_file->the_bfd, stub_sec, flags))
176 output_section = input_section->output_section;
177 secname = bfd_get_section_name (output_section->owner, output_section);
178 os = lang_output_section_find (secname);
180 info.input_section = input_section;
181 lang_list_init (&info.add);
182 lang_add_section (&info.add, stub_sec, os, stub_file);
184 if (info.add.head == NULL)
187 if (hook_in_stub (&info, &os->children.head))
191 einfo ("%X%P: can not make stub section: %E\n");
196 /* Another call-back for ppc64_elf_size_stubs. */
199 ppc_layout_sections_again ()
201 /* If we have changed sizes of the stub sections, then we need
202 to recalculate all the section offsets. This may mean we need to
203 add even more stubs. */
206 lang_reset_memory_regions ();
208 /* Resize the sections. */
209 lang_size_sections (stat_ptr->head, abs_output_section,
210 &stat_ptr->head, 0, (bfd_vma) 0, NULL);
212 /* Recalculate TOC base. */
213 ldemul_after_allocation ();
215 /* Do the assignments again. */
216 lang_do_assignments (stat_ptr->head, abs_output_section,
217 (fill_type *) 0, (bfd_vma) 0);
221 /* Call the back-end function to set TOC base after we have placed all
224 gld${EMULATION_NAME}_after_allocation ()
226 if (!link_info.relocateable)
227 _bfd_set_gp_value (output_bfd, ppc64_elf_toc (output_bfd));
232 build_section_lists (statement)
233 lang_statement_union_type *statement;
235 if (statement->header.type == lang_input_section_enum
236 && !statement->input_section.ifile->just_syms_flag
237 && statement->input_section.section->output_section != NULL
238 && statement->input_section.section->output_section->owner == output_bfd)
240 ppc64_elf_next_input_section (&link_info,
241 statement->input_section.section);
245 /* Final emulation specific call. */
248 gld${EMULATION_NAME}_finish ()
252 /* e_entry on PowerPC64 points to the function descriptor for
253 _start. If _start is missing, default to the first function
254 descriptor in the .opd section. */
255 entry_section = ".opd";
257 /* If generating a relocatable output file, then we don't have any
259 if (link_info.relocateable)
262 /* bfd_elf64_discard_info just plays with debugging sections,
263 ie. doesn't affect any code, so we can delay resizing the
264 sections. It's likely we'll resize everything in the process of
266 if (bfd_elf${ELFSIZE}_discard_info (output_bfd, &link_info))
269 ret = ppc64_elf_setup_section_lists (output_bfd, &link_info);
274 einfo ("%X%P: can not size stub section: %E\n");
278 lang_for_each_statement (build_section_lists);
280 /* Call into the BFD backend to do the real work. */
281 if (!ppc64_elf_size_stubs (output_bfd,
285 &ppc_add_stub_section,
286 &ppc_layout_sections_again))
288 einfo ("%X%P: can not size stub section: %E\n");
294 ppc_layout_sections_again ();
296 if (stub_file->the_bfd->sections != NULL)
298 if (!ppc64_elf_build_stubs (&link_info))
299 einfo ("%X%P: can not build stubs: %E\n");
304 /* Avoid processing the fake stub_file in vercheck, stat_needed and
305 check_needed routines. */
307 static void ppc_for_each_input_file_wrapper
308 PARAMS ((lang_input_statement_type *));
309 static void ppc_lang_for_each_input_file
310 PARAMS ((void (*) (lang_input_statement_type *)));
312 static void (*real_func) PARAMS ((lang_input_statement_type *));
314 static void ppc_for_each_input_file_wrapper (l)
315 lang_input_statement_type *l;
322 ppc_lang_for_each_input_file (func)
323 void (*func) PARAMS ((lang_input_statement_type *));
326 lang_for_each_input_file (&ppc_for_each_input_file_wrapper);
329 #define lang_for_each_input_file ppc_lang_for_each_input_file
333 # Define some shell vars to insert bits of code into the standard elf
334 # parse_args and list_options functions.
336 PARSE_AND_LIST_PROLOGUE='
337 #define OPTION_STUBGROUP_SIZE 301
340 # The options are repeated below so that no abbreviations are allowed.
341 # Otherwise -s matches stub-group-size
342 PARSE_AND_LIST_LONGOPTS='
343 { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
344 { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
347 PARSE_AND_LIST_OPTIONS='
349 --stub-group-size=N Maximum size of a group of input sections that can be\n\
350 handled by one stub section. A negative value\n\
351 locates all stubs before their branches (with a\n\
352 group size of -N), while a positive value allows\n\
353 two groups of input sections, one before, and one\n\
354 after each stub section. Values of +/-1 indicate\n\
355 the linker should choose suitable defaults.\n"
359 PARSE_AND_LIST_ARGS_CASES='
360 case OPTION_STUBGROUP_SIZE:
363 group_size = bfd_scan_vma (optarg, &end, 0);
365 einfo (_("%P%F: invalid number `%s'\''\n"), optarg);
370 # Put these extra ppc64elf routines in ld_${EMULATION_NAME}_emulation
372 LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
373 LDEMUL_FINISH=gld${EMULATION_NAME}_finish
374 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=ppc_create_output_section_statements