1# This shell script emits a C file. -*- C -*- 2# Copyright 2006, 2007 Free Software Foundation, Inc. 3# 4# This file is part of the GNU Binutils. 5# 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. 10# 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. 15# 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, 19# MA 02110-1301, USA. 20 21fragment <<EOF 22 23#include "ldctor.h" 24#include "elf/mips.h" 25#include "elfxx-mips.h" 26 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) 31 32/* Fake input file for stubs. */ 33static lang_input_statement_type *stub_file; 34static bfd *stub_bfd; 35 36static void 37mips_after_parse (void) 38{ 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) 43 { 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; 47 } 48 after_parse_default (); 49} 50 51struct hook_stub_info 52{ 53 lang_statement_list_type add; 54 asection *input_section; 55}; 56 57/* Traverse the linker tree to find the spot where the stub goes. */ 58 59static bfd_boolean 60hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp) 61{ 62 lang_statement_union_type *l; 63 bfd_boolean ret; 64 65 for (; (l = *lp) != NULL; lp = &l->header.next) 66 { 67 switch (l->header.type) 68 { 69 case lang_constructors_statement_enum: 70 ret = hook_in_stub (info, &constructor_list.head); 71 if (ret) 72 return ret; 73 break; 74 75 case lang_output_section_statement_enum: 76 ret = hook_in_stub (info, 77 &l->output_section_statement.children.head); 78 if (ret) 79 return ret; 80 break; 81 82 case lang_wild_statement_enum: 83 ret = hook_in_stub (info, &l->wild_statement.children.head); 84 if (ret) 85 return ret; 86 break; 87 88 case lang_group_statement_enum: 89 ret = hook_in_stub (info, &l->group_statement.children.head); 90 if (ret) 91 return ret; 92 break; 93 94 case lang_input_section_enum: 95 if (info->input_section == NULL 96 || l->input_section.section == info->input_section) 97 { 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; 102 return TRUE; 103 } 104 break; 105 106 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: 116 break; 117 118 default: 119 FAIL (); 120 break; 121 } 122 } 123 return FALSE; 124} 125 126/* 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. */ 130 131static asection * 132mips_add_stub_section (const char *stub_sec_name, asection *input_section, 133 asection *output_section) 134{ 135 asection *stub_sec; 136 flagword flags; 137 const char *secname; 138 lang_output_section_statement_type *os; 139 struct hook_stub_info info; 140 141 /* Create the stub file, if we haven't already. */ 142 if (stub_file == NULL) 143 { 144 stub_file = lang_add_input_file ("linker stubs", 145 lang_input_file_is_fake_enum, 146 NULL); 147 stub_bfd = bfd_create ("linker stubs", link_info.output_bfd); 148 if (stub_bfd == NULL 149 || !bfd_set_arch_mach (stub_bfd, 150 bfd_get_arch (link_info.output_bfd), 151 bfd_get_mach (link_info.output_bfd))) 152 { 153 einfo ("%F%P: can not create BFD %E\n"); 154 return NULL; 155 } 156 stub_bfd->flags |= BFD_LINKER_CREATED; 157 stub_file->the_bfd = stub_bfd; 158 ldlang_add_file (stub_file); 159 } 160 161 /* Create the section. */ 162 stub_sec = bfd_make_section_anyway (stub_bfd, stub_sec_name); 163 if (stub_sec == NULL) 164 goto err_ret; 165 166 /* Set the flags. */ 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)) 170 goto err_ret; 171 172 /* Create an output section statement. */ 173 secname = bfd_get_section_name (output_section->owner, output_section); 174 os = lang_output_section_find (secname); 175 176 /* 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) 180 goto err_ret; 181 182 /* Insert the new statement in the appropriate place. */ 183 info.input_section = input_section; 184 if (hook_in_stub (&info, &os->children.head)) 185 return stub_sec; 186 187 err_ret: 188 einfo ("%X%P: can not make stub section: %E\n"); 189 return NULL; 190} 191 192/* This is called before the input files are opened. */ 193 194static void 195mips_create_output_section_statements (void) 196{ 197 if (is_mips_elf (link_info.output_bfd)) 198 _bfd_mips_elf_init_stubs (&link_info, mips_add_stub_section); 199} 200 201/* This is called after we have merged the private data of the input bfds. */ 202 203static void 204mips_before_allocation (void) 205{ 206 flagword flags; 207 208 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); 213 214 gld${EMULATION_NAME}_before_allocation (); 215} 216 217/* Avoid processing the fake stub_file in vercheck, stat_needed and 218 check_needed routines. */ 219 220static void (*real_func) (lang_input_statement_type *); 221 222static void mips_for_each_input_file_wrapper (lang_input_statement_type *l) 223{ 224 if (l != stub_file) 225 (*real_func) (l); 226} 227 228static void 229mips_lang_for_each_input_file (void (*func) (lang_input_statement_type *)) 230{ 231 real_func = func; 232 lang_for_each_input_file (&mips_for_each_input_file_wrapper); 233} 234 235#define lang_for_each_input_file mips_lang_for_each_input_file 236 237EOF 238 239LDEMUL_AFTER_PARSE=mips_after_parse 240LDEMUL_BEFORE_ALLOCATION=mips_before_allocation 241LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=mips_create_output_section_statements 242