1 # This shell script emits a C file. -*- C -*-
2 # Copyright 2004, 2006, 2007, 2008 Free Software Foundation, Inc.
4 # This file is part of the GNU Binutils.
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 3 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., 51 Franklin Street - Fifth Floor, Boston,
25 #include "elfxx-mips.h"
27 #define is_mips_elf(bfd) \
28 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
29 && elf_tdata (bfd) != NULL \
30 && elf_object_id (bfd) == MIPS_ELF_TDATA)
32 /* Fake input file for stubs. */
33 static lang_input_statement_type *stub_file;
37 mips_after_parse (void)
39 /* .gnu.hash and the MIPS ABI require .dynsym to be sorted in different
40 ways. .gnu.hash needs symbols to be grouped by hash code whereas the
41 MIPS ABI requires a mapping between the GOT and the symbol table. */
42 if (link_info.emit_gnu_hash)
44 einfo ("%X%P: .gnu.hash is incompatible with the MIPS ABI\n");
45 link_info.emit_hash = TRUE;
46 link_info.emit_gnu_hash = FALSE;
48 after_parse_default ();
53 lang_statement_list_type add;
54 asection *input_section;
57 /* Traverse the linker tree to find the spot where the stub goes. */
60 hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp)
62 lang_statement_union_type *l;
65 for (; (l = *lp) != NULL; lp = &l->header.next)
67 switch (l->header.type)
69 case lang_constructors_statement_enum:
70 ret = hook_in_stub (info, &constructor_list.head);
75 case lang_output_section_statement_enum:
76 ret = hook_in_stub (info,
77 &l->output_section_statement.children.head);
82 case lang_wild_statement_enum:
83 ret = hook_in_stub (info, &l->wild_statement.children.head);
88 case lang_group_statement_enum:
89 ret = hook_in_stub (info, &l->group_statement.children.head);
94 case lang_input_section_enum:
95 if (info->input_section == NULL
96 || l->input_section.section == info->input_section)
98 /* We've found our section. Insert the stub immediately
99 before its associated input section. */
100 *lp = info->add.head;
101 *(info->add.tail) = l;
106 case lang_data_statement_enum:
107 case lang_reloc_statement_enum:
108 case lang_object_symbols_statement_enum:
109 case lang_output_statement_enum:
110 case lang_target_statement_enum:
111 case lang_input_statement_enum:
112 case lang_assignment_statement_enum:
113 case lang_padding_statement_enum:
114 case lang_address_statement_enum:
115 case lang_fill_statement_enum:
126 /* Create a new stub section called STUB_SEC_NAME and arrange for it to
127 be linked in OUTPUT_SECTION. The section should go at the beginning of
128 OUTPUT_SECTION if INPUT_SECTION is null, otherwise it must go immediately
129 before INPUT_SECTION. */
132 mips_add_stub_section (const char *stub_sec_name, asection *input_section,
133 asection *output_section)
138 lang_output_section_statement_type *os;
139 struct hook_stub_info info;
141 /* Create the stub file, if we haven't already. */
142 if (stub_file == NULL)
144 stub_file = lang_add_input_file ("linker stubs",
145 lang_input_file_is_fake_enum,
147 stub_bfd = bfd_create ("linker stubs", link_info.output_bfd);
149 || !bfd_set_arch_mach (stub_bfd,
150 bfd_get_arch (link_info.output_bfd),
151 bfd_get_mach (link_info.output_bfd)))
153 einfo ("%F%P: can not create BFD %E\n");
156 stub_bfd->flags |= BFD_LINKER_CREATED;
157 stub_file->the_bfd = stub_bfd;
158 ldlang_add_file (stub_file);
161 /* Create the section. */
162 stub_sec = bfd_make_section_anyway (stub_bfd, stub_sec_name);
163 if (stub_sec == NULL)
167 flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
168 | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_KEEP);
169 if (!bfd_set_section_flags (stub_bfd, stub_sec, flags))
172 /* Create an output section statement. */
173 secname = bfd_get_section_name (output_section->owner, output_section);
174 os = lang_output_section_find (secname);
176 /* Initialize a statement list that contains only the new statement. */
177 lang_list_init (&info.add);
178 lang_add_section (&info.add, stub_sec, os);
179 if (info.add.head == NULL)
182 /* Insert the new statement in the appropriate place. */
183 info.input_section = input_section;
184 if (hook_in_stub (&info, &os->children.head))
188 einfo ("%X%P: can not make stub section: %E\n");
192 /* This is called before the input files are opened. */
195 mips_create_output_section_statements (void)
197 if (is_mips_elf (link_info.output_bfd))
198 _bfd_mips_elf_init_stubs (&link_info, mips_add_stub_section);
201 /* This is called after we have merged the private data of the input bfds. */
204 mips_before_allocation (void)
208 flags = elf_elfheader (link_info.output_bfd)->e_flags;
209 if (!link_info.shared
210 && !link_info.nocopyreloc
211 && (flags & (EF_MIPS_PIC | EF_MIPS_CPIC)) == EF_MIPS_CPIC)
212 _bfd_mips_elf_use_plts_and_copy_relocs (&link_info);
214 gld${EMULATION_NAME}_before_allocation ();
217 /* Avoid processing the fake stub_file in vercheck, stat_needed and
218 check_needed routines. */
220 static void (*real_func) (lang_input_statement_type *);
222 static void mips_for_each_input_file_wrapper (lang_input_statement_type *l)
229 mips_lang_for_each_input_file (void (*func) (lang_input_statement_type *))
232 lang_for_each_input_file (&mips_for_each_input_file_wrapper);
235 #define lang_for_each_input_file mips_lang_for_each_input_file
239 LDEMUL_AFTER_PARSE=mips_after_parse
240 LDEMUL_BEFORE_ALLOCATION=mips_before_allocation
241 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=mips_create_output_section_statements