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5197 | serge | 1 | /* ELF executable support for BFD. |
6324 | serge | 2 | Copyright (C) 1991-2015 Free Software Foundation, Inc. |
5197 | serge | 3 | |
4 | Written by Fred Fish @ Cygnus Support, from information published |
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5 | in "UNIX System V Release 4, Programmers Guide: ANSI C and |
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6 | Programming Support Tools". Sufficient support for gdb. |
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7 | |||
8 | Rewritten by Mark Eichin @ Cygnus Support, from information |
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9 | published in "System V Application Binary Interface", chapters 4 |
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10 | and 5, as well as the various "Processor Supplement" documents |
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11 | derived from it. Added support for assembler and other object file |
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12 | utilities. Further work done by Ken Raeburn (Cygnus Support), Michael |
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13 | Meissner (Open Software Foundation), and Peter Hoogenboom (University |
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14 | of Utah) to finish and extend this. |
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15 | |||
16 | This file is part of BFD, the Binary File Descriptor library. |
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17 | |||
18 | This program is free software; you can redistribute it and/or modify |
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19 | it under the terms of the GNU General Public License as published by |
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20 | the Free Software Foundation; either version 3 of the License, or |
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21 | (at your option) any later version. |
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22 | |||
23 | This program is distributed in the hope that it will be useful, |
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24 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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25 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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26 | GNU General Public License for more details. |
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27 | |||
28 | You should have received a copy of the GNU General Public License |
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29 | along with this program; if not, write to the Free Software |
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30 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
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31 | MA 02110-1301, USA. */ |
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32 | |||
33 | |||
34 | /* Problems and other issues to resolve. |
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35 | |||
36 | (1) BFD expects there to be some fixed number of "sections" in |
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37 | the object file. I.E. there is a "section_count" variable in the |
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38 | bfd structure which contains the number of sections. However, ELF |
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39 | supports multiple "views" of a file. In particular, with current |
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40 | implementations, executable files typically have two tables, a |
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41 | program header table and a section header table, both of which |
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42 | partition the executable. |
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43 | |||
44 | In ELF-speak, the "linking view" of the file uses the section header |
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45 | table to access "sections" within the file, and the "execution view" |
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46 | uses the program header table to access "segments" within the file. |
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47 | "Segments" typically may contain all the data from one or more |
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48 | "sections". |
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49 | |||
50 | Note that the section header table is optional in ELF executables, |
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51 | but it is this information that is most useful to gdb. If the |
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52 | section header table is missing, then gdb should probably try |
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53 | to make do with the program header table. (FIXME) |
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54 | |||
55 | (2) The code in this file is compiled twice, once in 32-bit mode and |
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56 | once in 64-bit mode. More of it should be made size-independent |
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57 | and moved into elf.c. |
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58 | |||
59 | (3) ELF section symbols are handled rather sloppily now. This should |
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60 | be cleaned up, and ELF section symbols reconciled with BFD section |
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61 | symbols. |
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62 | |||
63 | (4) We need a published spec for 64-bit ELF. We've got some stuff here |
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64 | that we're using for SPARC V9 64-bit chips, but don't assume that |
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65 | it's cast in stone. |
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66 | */ |
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67 | |||
68 | #include "sysdep.h" |
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69 | #include "bfd.h" |
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70 | #include "libiberty.h" |
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71 | #include "bfdlink.h" |
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72 | #include "libbfd.h" |
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73 | #include "elf-bfd.h" |
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6324 | serge | 74 | #include "libiberty.h" |
5197 | serge | 75 | |
76 | /* Renaming structures, typedefs, macros and functions to be size-specific. */ |
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77 | #define Elf_External_Ehdr NAME(Elf,External_Ehdr) |
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78 | #define Elf_External_Sym NAME(Elf,External_Sym) |
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79 | #define Elf_External_Shdr NAME(Elf,External_Shdr) |
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80 | #define Elf_External_Phdr NAME(Elf,External_Phdr) |
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81 | #define Elf_External_Rel NAME(Elf,External_Rel) |
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82 | #define Elf_External_Rela NAME(Elf,External_Rela) |
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83 | #define Elf_External_Dyn NAME(Elf,External_Dyn) |
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84 | |||
85 | #define elf_core_file_failing_command NAME(bfd_elf,core_file_failing_command) |
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86 | #define elf_core_file_failing_signal NAME(bfd_elf,core_file_failing_signal) |
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87 | #define elf_core_file_matches_executable_p \ |
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88 | NAME(bfd_elf,core_file_matches_executable_p) |
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89 | #define elf_core_file_pid NAME(bfd_elf,core_file_pid) |
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90 | #define elf_object_p NAME(bfd_elf,object_p) |
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91 | #define elf_core_file_p NAME(bfd_elf,core_file_p) |
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92 | #define elf_get_symtab_upper_bound NAME(bfd_elf,get_symtab_upper_bound) |
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93 | #define elf_get_dynamic_symtab_upper_bound \ |
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94 | NAME(bfd_elf,get_dynamic_symtab_upper_bound) |
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95 | #define elf_swap_reloc_in NAME(bfd_elf,swap_reloc_in) |
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96 | #define elf_swap_reloca_in NAME(bfd_elf,swap_reloca_in) |
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97 | #define elf_swap_reloc_out NAME(bfd_elf,swap_reloc_out) |
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98 | #define elf_swap_reloca_out NAME(bfd_elf,swap_reloca_out) |
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99 | #define elf_swap_symbol_in NAME(bfd_elf,swap_symbol_in) |
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100 | #define elf_swap_symbol_out NAME(bfd_elf,swap_symbol_out) |
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101 | #define elf_swap_phdr_in NAME(bfd_elf,swap_phdr_in) |
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102 | #define elf_swap_phdr_out NAME(bfd_elf,swap_phdr_out) |
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103 | #define elf_swap_dyn_in NAME(bfd_elf,swap_dyn_in) |
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104 | #define elf_swap_dyn_out NAME(bfd_elf,swap_dyn_out) |
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105 | #define elf_get_reloc_upper_bound NAME(bfd_elf,get_reloc_upper_bound) |
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106 | #define elf_canonicalize_reloc NAME(bfd_elf,canonicalize_reloc) |
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107 | #define elf_slurp_symbol_table NAME(bfd_elf,slurp_symbol_table) |
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108 | #define elf_canonicalize_symtab NAME(bfd_elf,canonicalize_symtab) |
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109 | #define elf_canonicalize_dynamic_symtab \ |
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110 | NAME(bfd_elf,canonicalize_dynamic_symtab) |
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111 | #define elf_get_synthetic_symtab \ |
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112 | NAME(bfd_elf,get_synthetic_symtab) |
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113 | #define elf_make_empty_symbol NAME(bfd_elf,make_empty_symbol) |
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114 | #define elf_get_symbol_info NAME(bfd_elf,get_symbol_info) |
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115 | #define elf_get_lineno NAME(bfd_elf,get_lineno) |
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116 | #define elf_set_arch_mach NAME(bfd_elf,set_arch_mach) |
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117 | #define elf_find_nearest_line NAME(bfd_elf,find_nearest_line) |
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118 | #define elf_sizeof_headers NAME(bfd_elf,sizeof_headers) |
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119 | #define elf_set_section_contents NAME(bfd_elf,set_section_contents) |
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120 | #define elf_no_info_to_howto NAME(bfd_elf,no_info_to_howto) |
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121 | #define elf_no_info_to_howto_rel NAME(bfd_elf,no_info_to_howto_rel) |
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122 | #define elf_find_section NAME(bfd_elf,find_section) |
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123 | #define elf_write_shdrs_and_ehdr NAME(bfd_elf,write_shdrs_and_ehdr) |
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124 | #define elf_write_out_phdrs NAME(bfd_elf,write_out_phdrs) |
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125 | #define elf_checksum_contents NAME(bfd_elf,checksum_contents) |
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126 | #define elf_write_relocs NAME(bfd_elf,write_relocs) |
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127 | #define elf_slurp_reloc_table NAME(bfd_elf,slurp_reloc_table) |
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128 | |||
129 | #if ARCH_SIZE == 64 |
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130 | #define ELF_R_INFO(X,Y) ELF64_R_INFO(X,Y) |
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131 | #define ELF_R_SYM(X) ELF64_R_SYM(X) |
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132 | #define ELF_R_TYPE(X) ELF64_R_TYPE(X) |
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133 | #define ELFCLASS ELFCLASS64 |
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134 | #define FILE_ALIGN 8 |
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135 | #define LOG_FILE_ALIGN 3 |
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136 | #endif |
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137 | #if ARCH_SIZE == 32 |
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138 | #define ELF_R_INFO(X,Y) ELF32_R_INFO(X,Y) |
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139 | #define ELF_R_SYM(X) ELF32_R_SYM(X) |
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140 | #define ELF_R_TYPE(X) ELF32_R_TYPE(X) |
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141 | #define ELFCLASS ELFCLASS32 |
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142 | #define FILE_ALIGN 4 |
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143 | #define LOG_FILE_ALIGN 2 |
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144 | #endif |
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145 | |||
146 | #if DEBUG & 2 |
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147 | static void elf_debug_section (int, Elf_Internal_Shdr *); |
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148 | #endif |
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149 | #if DEBUG & 1 |
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150 | static void elf_debug_file (Elf_Internal_Ehdr *); |
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151 | #endif |
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152 | |||
153 | /* Structure swapping routines */ |
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154 | |||
155 | /* Should perhaps use put_offset, put_word, etc. For now, the two versions |
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156 | can be handled by explicitly specifying 32 bits or "the long type". */ |
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157 | #if ARCH_SIZE == 64 |
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158 | #define H_PUT_WORD H_PUT_64 |
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159 | #define H_PUT_SIGNED_WORD H_PUT_S64 |
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160 | #define H_GET_WORD H_GET_64 |
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161 | #define H_GET_SIGNED_WORD H_GET_S64 |
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162 | #endif |
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163 | #if ARCH_SIZE == 32 |
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164 | #define H_PUT_WORD H_PUT_32 |
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165 | #define H_PUT_SIGNED_WORD H_PUT_S32 |
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166 | #define H_GET_WORD H_GET_32 |
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167 | #define H_GET_SIGNED_WORD H_GET_S32 |
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168 | #endif |
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169 | |||
170 | /* Translate an ELF symbol in external format into an ELF symbol in internal |
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171 | format. */ |
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172 | |||
173 | bfd_boolean |
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174 | elf_swap_symbol_in (bfd *abfd, |
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175 | const void *psrc, |
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176 | const void *pshn, |
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177 | Elf_Internal_Sym *dst) |
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178 | { |
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179 | const Elf_External_Sym *src = (const Elf_External_Sym *) psrc; |
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180 | const Elf_External_Sym_Shndx *shndx = (const Elf_External_Sym_Shndx *) pshn; |
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181 | int signed_vma = get_elf_backend_data (abfd)->sign_extend_vma; |
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182 | |||
183 | dst->st_name = H_GET_32 (abfd, src->st_name); |
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184 | if (signed_vma) |
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185 | dst->st_value = H_GET_SIGNED_WORD (abfd, src->st_value); |
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186 | else |
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187 | dst->st_value = H_GET_WORD (abfd, src->st_value); |
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188 | dst->st_size = H_GET_WORD (abfd, src->st_size); |
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189 | dst->st_info = H_GET_8 (abfd, src->st_info); |
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190 | dst->st_other = H_GET_8 (abfd, src->st_other); |
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191 | dst->st_shndx = H_GET_16 (abfd, src->st_shndx); |
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192 | if (dst->st_shndx == (SHN_XINDEX & 0xffff)) |
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193 | { |
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194 | if (shndx == NULL) |
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195 | return FALSE; |
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196 | dst->st_shndx = H_GET_32 (abfd, shndx->est_shndx); |
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197 | } |
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198 | else if (dst->st_shndx >= (SHN_LORESERVE & 0xffff)) |
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199 | dst->st_shndx += SHN_LORESERVE - (SHN_LORESERVE & 0xffff); |
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200 | dst->st_target_internal = 0; |
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201 | return TRUE; |
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202 | } |
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203 | |||
204 | /* Translate an ELF symbol in internal format into an ELF symbol in external |
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205 | format. */ |
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206 | |||
207 | void |
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208 | elf_swap_symbol_out (bfd *abfd, |
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209 | const Elf_Internal_Sym *src, |
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210 | void *cdst, |
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211 | void *shndx) |
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212 | { |
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213 | unsigned int tmp; |
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214 | Elf_External_Sym *dst = (Elf_External_Sym *) cdst; |
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215 | H_PUT_32 (abfd, src->st_name, dst->st_name); |
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216 | H_PUT_WORD (abfd, src->st_value, dst->st_value); |
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217 | H_PUT_WORD (abfd, src->st_size, dst->st_size); |
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218 | H_PUT_8 (abfd, src->st_info, dst->st_info); |
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219 | H_PUT_8 (abfd, src->st_other, dst->st_other); |
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220 | tmp = src->st_shndx; |
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221 | if (tmp >= (SHN_LORESERVE & 0xffff) && tmp < SHN_LORESERVE) |
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222 | { |
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223 | if (shndx == NULL) |
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224 | abort (); |
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225 | H_PUT_32 (abfd, tmp, shndx); |
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226 | tmp = SHN_XINDEX & 0xffff; |
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227 | } |
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228 | H_PUT_16 (abfd, tmp, dst->st_shndx); |
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229 | } |
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230 | |||
231 | /* Translate an ELF file header in external format into an ELF file header in |
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232 | internal format. */ |
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233 | |||
234 | static void |
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235 | elf_swap_ehdr_in (bfd *abfd, |
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236 | const Elf_External_Ehdr *src, |
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237 | Elf_Internal_Ehdr *dst) |
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238 | { |
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239 | int signed_vma = get_elf_backend_data (abfd)->sign_extend_vma; |
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240 | memcpy (dst->e_ident, src->e_ident, EI_NIDENT); |
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241 | dst->e_type = H_GET_16 (abfd, src->e_type); |
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242 | dst->e_machine = H_GET_16 (abfd, src->e_machine); |
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243 | dst->e_version = H_GET_32 (abfd, src->e_version); |
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244 | if (signed_vma) |
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245 | dst->e_entry = H_GET_SIGNED_WORD (abfd, src->e_entry); |
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246 | else |
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247 | dst->e_entry = H_GET_WORD (abfd, src->e_entry); |
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248 | dst->e_phoff = H_GET_WORD (abfd, src->e_phoff); |
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249 | dst->e_shoff = H_GET_WORD (abfd, src->e_shoff); |
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250 | dst->e_flags = H_GET_32 (abfd, src->e_flags); |
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251 | dst->e_ehsize = H_GET_16 (abfd, src->e_ehsize); |
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252 | dst->e_phentsize = H_GET_16 (abfd, src->e_phentsize); |
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253 | dst->e_phnum = H_GET_16 (abfd, src->e_phnum); |
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254 | dst->e_shentsize = H_GET_16 (abfd, src->e_shentsize); |
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255 | dst->e_shnum = H_GET_16 (abfd, src->e_shnum); |
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256 | dst->e_shstrndx = H_GET_16 (abfd, src->e_shstrndx); |
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257 | } |
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258 | |||
259 | /* Translate an ELF file header in internal format into an ELF file header in |
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260 | external format. */ |
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261 | |||
262 | static void |
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263 | elf_swap_ehdr_out (bfd *abfd, |
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264 | const Elf_Internal_Ehdr *src, |
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265 | Elf_External_Ehdr *dst) |
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266 | { |
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267 | unsigned int tmp; |
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268 | int signed_vma = get_elf_backend_data (abfd)->sign_extend_vma; |
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269 | memcpy (dst->e_ident, src->e_ident, EI_NIDENT); |
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270 | /* note that all elements of dst are *arrays of unsigned char* already... */ |
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271 | H_PUT_16 (abfd, src->e_type, dst->e_type); |
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272 | H_PUT_16 (abfd, src->e_machine, dst->e_machine); |
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273 | H_PUT_32 (abfd, src->e_version, dst->e_version); |
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274 | if (signed_vma) |
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275 | H_PUT_SIGNED_WORD (abfd, src->e_entry, dst->e_entry); |
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276 | else |
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277 | H_PUT_WORD (abfd, src->e_entry, dst->e_entry); |
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278 | H_PUT_WORD (abfd, src->e_phoff, dst->e_phoff); |
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279 | H_PUT_WORD (abfd, src->e_shoff, dst->e_shoff); |
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280 | H_PUT_32 (abfd, src->e_flags, dst->e_flags); |
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281 | H_PUT_16 (abfd, src->e_ehsize, dst->e_ehsize); |
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282 | H_PUT_16 (abfd, src->e_phentsize, dst->e_phentsize); |
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283 | tmp = src->e_phnum; |
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284 | if (tmp > PN_XNUM) |
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285 | tmp = PN_XNUM; |
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286 | H_PUT_16 (abfd, tmp, dst->e_phnum); |
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287 | H_PUT_16 (abfd, src->e_shentsize, dst->e_shentsize); |
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288 | tmp = src->e_shnum; |
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289 | if (tmp >= (SHN_LORESERVE & 0xffff)) |
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290 | tmp = SHN_UNDEF; |
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291 | H_PUT_16 (abfd, tmp, dst->e_shnum); |
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292 | tmp = src->e_shstrndx; |
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293 | if (tmp >= (SHN_LORESERVE & 0xffff)) |
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294 | tmp = SHN_XINDEX & 0xffff; |
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295 | H_PUT_16 (abfd, tmp, dst->e_shstrndx); |
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296 | } |
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297 | |||
298 | /* Translate an ELF section header table entry in external format into an |
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299 | ELF section header table entry in internal format. */ |
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300 | |||
301 | static void |
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302 | elf_swap_shdr_in (bfd *abfd, |
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303 | const Elf_External_Shdr *src, |
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304 | Elf_Internal_Shdr *dst) |
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305 | { |
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306 | int signed_vma = get_elf_backend_data (abfd)->sign_extend_vma; |
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307 | |||
308 | dst->sh_name = H_GET_32 (abfd, src->sh_name); |
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309 | dst->sh_type = H_GET_32 (abfd, src->sh_type); |
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310 | dst->sh_flags = H_GET_WORD (abfd, src->sh_flags); |
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311 | if (signed_vma) |
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312 | dst->sh_addr = H_GET_SIGNED_WORD (abfd, src->sh_addr); |
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313 | else |
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314 | dst->sh_addr = H_GET_WORD (abfd, src->sh_addr); |
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315 | dst->sh_offset = H_GET_WORD (abfd, src->sh_offset); |
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316 | dst->sh_size = H_GET_WORD (abfd, src->sh_size); |
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317 | dst->sh_link = H_GET_32 (abfd, src->sh_link); |
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318 | dst->sh_info = H_GET_32 (abfd, src->sh_info); |
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319 | dst->sh_addralign = H_GET_WORD (abfd, src->sh_addralign); |
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320 | dst->sh_entsize = H_GET_WORD (abfd, src->sh_entsize); |
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321 | dst->bfd_section = NULL; |
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322 | dst->contents = NULL; |
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323 | } |
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324 | |||
325 | /* Translate an ELF section header table entry in internal format into an |
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326 | ELF section header table entry in external format. */ |
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327 | |||
328 | static void |
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329 | elf_swap_shdr_out (bfd *abfd, |
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330 | const Elf_Internal_Shdr *src, |
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331 | Elf_External_Shdr *dst) |
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332 | { |
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333 | /* note that all elements of dst are *arrays of unsigned char* already... */ |
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334 | H_PUT_32 (abfd, src->sh_name, dst->sh_name); |
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335 | H_PUT_32 (abfd, src->sh_type, dst->sh_type); |
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336 | H_PUT_WORD (abfd, src->sh_flags, dst->sh_flags); |
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337 | H_PUT_WORD (abfd, src->sh_addr, dst->sh_addr); |
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338 | H_PUT_WORD (abfd, src->sh_offset, dst->sh_offset); |
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339 | H_PUT_WORD (abfd, src->sh_size, dst->sh_size); |
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340 | H_PUT_32 (abfd, src->sh_link, dst->sh_link); |
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341 | H_PUT_32 (abfd, src->sh_info, dst->sh_info); |
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342 | H_PUT_WORD (abfd, src->sh_addralign, dst->sh_addralign); |
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343 | H_PUT_WORD (abfd, src->sh_entsize, dst->sh_entsize); |
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344 | } |
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345 | |||
346 | /* Translate an ELF program header table entry in external format into an |
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347 | ELF program header table entry in internal format. */ |
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348 | |||
349 | void |
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350 | elf_swap_phdr_in (bfd *abfd, |
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351 | const Elf_External_Phdr *src, |
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352 | Elf_Internal_Phdr *dst) |
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353 | { |
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354 | int signed_vma = get_elf_backend_data (abfd)->sign_extend_vma; |
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355 | |||
356 | dst->p_type = H_GET_32 (abfd, src->p_type); |
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357 | dst->p_flags = H_GET_32 (abfd, src->p_flags); |
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358 | dst->p_offset = H_GET_WORD (abfd, src->p_offset); |
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359 | if (signed_vma) |
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360 | { |
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361 | dst->p_vaddr = H_GET_SIGNED_WORD (abfd, src->p_vaddr); |
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362 | dst->p_paddr = H_GET_SIGNED_WORD (abfd, src->p_paddr); |
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363 | } |
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364 | else |
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365 | { |
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366 | dst->p_vaddr = H_GET_WORD (abfd, src->p_vaddr); |
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367 | dst->p_paddr = H_GET_WORD (abfd, src->p_paddr); |
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368 | } |
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369 | dst->p_filesz = H_GET_WORD (abfd, src->p_filesz); |
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370 | dst->p_memsz = H_GET_WORD (abfd, src->p_memsz); |
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371 | dst->p_align = H_GET_WORD (abfd, src->p_align); |
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372 | } |
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373 | |||
374 | void |
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375 | elf_swap_phdr_out (bfd *abfd, |
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376 | const Elf_Internal_Phdr *src, |
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377 | Elf_External_Phdr *dst) |
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378 | { |
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379 | const struct elf_backend_data *bed; |
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380 | bfd_vma p_paddr; |
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381 | |||
382 | bed = get_elf_backend_data (abfd); |
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383 | p_paddr = bed->want_p_paddr_set_to_zero ? 0 : src->p_paddr; |
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384 | |||
385 | /* note that all elements of dst are *arrays of unsigned char* already... */ |
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386 | H_PUT_32 (abfd, src->p_type, dst->p_type); |
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387 | H_PUT_WORD (abfd, src->p_offset, dst->p_offset); |
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388 | H_PUT_WORD (abfd, src->p_vaddr, dst->p_vaddr); |
||
389 | H_PUT_WORD (abfd, p_paddr, dst->p_paddr); |
||
390 | H_PUT_WORD (abfd, src->p_filesz, dst->p_filesz); |
||
391 | H_PUT_WORD (abfd, src->p_memsz, dst->p_memsz); |
||
392 | H_PUT_32 (abfd, src->p_flags, dst->p_flags); |
||
393 | H_PUT_WORD (abfd, src->p_align, dst->p_align); |
||
394 | } |
||
395 | |||
396 | /* Translate an ELF reloc from external format to internal format. */ |
||
397 | void |
||
398 | elf_swap_reloc_in (bfd *abfd, |
||
399 | const bfd_byte *s, |
||
400 | Elf_Internal_Rela *dst) |
||
401 | { |
||
402 | const Elf_External_Rel *src = (const Elf_External_Rel *) s; |
||
403 | dst->r_offset = H_GET_WORD (abfd, src->r_offset); |
||
404 | dst->r_info = H_GET_WORD (abfd, src->r_info); |
||
405 | dst->r_addend = 0; |
||
406 | } |
||
407 | |||
408 | void |
||
409 | elf_swap_reloca_in (bfd *abfd, |
||
410 | const bfd_byte *s, |
||
411 | Elf_Internal_Rela *dst) |
||
412 | { |
||
413 | const Elf_External_Rela *src = (const Elf_External_Rela *) s; |
||
414 | dst->r_offset = H_GET_WORD (abfd, src->r_offset); |
||
415 | dst->r_info = H_GET_WORD (abfd, src->r_info); |
||
416 | dst->r_addend = H_GET_SIGNED_WORD (abfd, src->r_addend); |
||
417 | } |
||
418 | |||
419 | /* Translate an ELF reloc from internal format to external format. */ |
||
420 | void |
||
421 | elf_swap_reloc_out (bfd *abfd, |
||
422 | const Elf_Internal_Rela *src, |
||
423 | bfd_byte *d) |
||
424 | { |
||
425 | Elf_External_Rel *dst = (Elf_External_Rel *) d; |
||
426 | H_PUT_WORD (abfd, src->r_offset, dst->r_offset); |
||
427 | H_PUT_WORD (abfd, src->r_info, dst->r_info); |
||
428 | } |
||
429 | |||
430 | void |
||
431 | elf_swap_reloca_out (bfd *abfd, |
||
432 | const Elf_Internal_Rela *src, |
||
433 | bfd_byte *d) |
||
434 | { |
||
435 | Elf_External_Rela *dst = (Elf_External_Rela *) d; |
||
436 | H_PUT_WORD (abfd, src->r_offset, dst->r_offset); |
||
437 | H_PUT_WORD (abfd, src->r_info, dst->r_info); |
||
438 | H_PUT_SIGNED_WORD (abfd, src->r_addend, dst->r_addend); |
||
439 | } |
||
440 | |||
441 | void |
||
442 | elf_swap_dyn_in (bfd *abfd, |
||
443 | const void *p, |
||
444 | Elf_Internal_Dyn *dst) |
||
445 | { |
||
446 | const Elf_External_Dyn *src = (const Elf_External_Dyn *) p; |
||
447 | |||
448 | dst->d_tag = H_GET_WORD (abfd, src->d_tag); |
||
449 | dst->d_un.d_val = H_GET_WORD (abfd, src->d_un.d_val); |
||
450 | } |
||
451 | |||
452 | void |
||
453 | elf_swap_dyn_out (bfd *abfd, |
||
454 | const Elf_Internal_Dyn *src, |
||
455 | void *p) |
||
456 | { |
||
457 | Elf_External_Dyn *dst = (Elf_External_Dyn *) p; |
||
458 | |||
459 | H_PUT_WORD (abfd, src->d_tag, dst->d_tag); |
||
460 | H_PUT_WORD (abfd, src->d_un.d_val, dst->d_un.d_val); |
||
461 | } |
||
462 | |||
463 | /* ELF .o/exec file reading */ |
||
464 | |||
465 | /* Begin processing a given object. |
||
466 | |||
467 | First we validate the file by reading in the ELF header and checking |
||
468 | the magic number. */ |
||
469 | |||
470 | static inline bfd_boolean |
||
471 | elf_file_p (Elf_External_Ehdr *x_ehdrp) |
||
472 | { |
||
473 | return ((x_ehdrp->e_ident[EI_MAG0] == ELFMAG0) |
||
474 | && (x_ehdrp->e_ident[EI_MAG1] == ELFMAG1) |
||
475 | && (x_ehdrp->e_ident[EI_MAG2] == ELFMAG2) |
||
476 | && (x_ehdrp->e_ident[EI_MAG3] == ELFMAG3)); |
||
477 | } |
||
478 | |||
479 | /* Check to see if the file associated with ABFD matches the target vector |
||
480 | that ABFD points to. |
||
481 | |||
482 | Note that we may be called several times with the same ABFD, but different |
||
483 | target vectors, most of which will not match. We have to avoid leaving |
||
484 | any side effects in ABFD, or any data it points to (like tdata), if the |
||
485 | file does not match the target vector. */ |
||
486 | |||
487 | const bfd_target * |
||
488 | elf_object_p (bfd *abfd) |
||
489 | { |
||
490 | Elf_External_Ehdr x_ehdr; /* Elf file header, external form */ |
||
491 | Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form */ |
||
492 | Elf_External_Shdr x_shdr; /* Section header table entry, external form */ |
||
493 | Elf_Internal_Shdr i_shdr; |
||
494 | Elf_Internal_Shdr *i_shdrp; /* Section header table, internal form */ |
||
495 | unsigned int shindex; |
||
496 | const struct elf_backend_data *ebd; |
||
497 | asection *s; |
||
498 | bfd_size_type amt; |
||
499 | const bfd_target *target; |
||
500 | |||
501 | /* Read in the ELF header in external format. */ |
||
502 | |||
503 | if (bfd_bread (&x_ehdr, sizeof (x_ehdr), abfd) != sizeof (x_ehdr)) |
||
504 | { |
||
505 | if (bfd_get_error () != bfd_error_system_call) |
||
506 | goto got_wrong_format_error; |
||
507 | else |
||
508 | goto got_no_match; |
||
509 | } |
||
510 | |||
511 | /* Now check to see if we have a valid ELF file, and one that BFD can |
||
512 | make use of. The magic number must match, the address size ('class') |
||
513 | and byte-swapping must match our XVEC entry, and it must have a |
||
514 | section header table (FIXME: See comments re sections at top of this |
||
515 | file). */ |
||
516 | |||
517 | if (! elf_file_p (&x_ehdr) |
||
518 | || x_ehdr.e_ident[EI_VERSION] != EV_CURRENT |
||
519 | || x_ehdr.e_ident[EI_CLASS] != ELFCLASS) |
||
520 | goto got_wrong_format_error; |
||
521 | |||
522 | /* Check that file's byte order matches xvec's */ |
||
523 | switch (x_ehdr.e_ident[EI_DATA]) |
||
524 | { |
||
525 | case ELFDATA2MSB: /* Big-endian */ |
||
526 | if (! bfd_header_big_endian (abfd)) |
||
527 | goto got_wrong_format_error; |
||
528 | break; |
||
529 | case ELFDATA2LSB: /* Little-endian */ |
||
530 | if (! bfd_header_little_endian (abfd)) |
||
531 | goto got_wrong_format_error; |
||
532 | break; |
||
533 | case ELFDATANONE: /* No data encoding specified */ |
||
534 | default: /* Unknown data encoding specified */ |
||
535 | goto got_wrong_format_error; |
||
536 | } |
||
537 | |||
538 | target = abfd->xvec; |
||
539 | |||
540 | /* Allocate an instance of the elf_obj_tdata structure and hook it up to |
||
541 | the tdata pointer in the bfd. */ |
||
542 | |||
543 | if (! (*target->_bfd_set_format[bfd_object]) (abfd)) |
||
544 | goto got_no_match; |
||
545 | |||
546 | /* Now that we know the byte order, swap in the rest of the header */ |
||
547 | i_ehdrp = elf_elfheader (abfd); |
||
548 | elf_swap_ehdr_in (abfd, &x_ehdr, i_ehdrp); |
||
549 | #if DEBUG & 1 |
||
550 | elf_debug_file (i_ehdrp); |
||
551 | #endif |
||
552 | |||
553 | /* Reject ET_CORE (header indicates core file, not object file) */ |
||
554 | if (i_ehdrp->e_type == ET_CORE) |
||
555 | goto got_wrong_format_error; |
||
556 | |||
557 | /* If this is a relocatable file and there is no section header |
||
558 | table, then we're hosed. */ |
||
559 | if (i_ehdrp->e_shoff == 0 && i_ehdrp->e_type == ET_REL) |
||
560 | goto got_wrong_format_error; |
||
561 | |||
562 | /* As a simple sanity check, verify that what BFD thinks is the |
||
563 | size of each section header table entry actually matches the size |
||
564 | recorded in the file, but only if there are any sections. */ |
||
565 | if (i_ehdrp->e_shentsize != sizeof (x_shdr) && i_ehdrp->e_shnum != 0) |
||
566 | goto got_wrong_format_error; |
||
567 | |||
568 | /* Further sanity check. */ |
||
569 | if (i_ehdrp->e_shoff == 0 && i_ehdrp->e_shnum != 0) |
||
570 | goto got_wrong_format_error; |
||
571 | |||
572 | ebd = get_elf_backend_data (abfd); |
||
573 | if (ebd->s->arch_size != ARCH_SIZE) |
||
574 | goto got_wrong_format_error; |
||
575 | |||
576 | /* Check that the ELF e_machine field matches what this particular |
||
577 | BFD format expects. */ |
||
578 | if (ebd->elf_machine_code != i_ehdrp->e_machine |
||
579 | && (ebd->elf_machine_alt1 == 0 |
||
580 | || i_ehdrp->e_machine != ebd->elf_machine_alt1) |
||
581 | && (ebd->elf_machine_alt2 == 0 |
||
582 | || i_ehdrp->e_machine != ebd->elf_machine_alt2) |
||
583 | && ebd->elf_machine_code != EM_NONE) |
||
584 | goto got_wrong_format_error; |
||
585 | |||
586 | if (i_ehdrp->e_type == ET_EXEC) |
||
587 | abfd->flags |= EXEC_P; |
||
588 | else if (i_ehdrp->e_type == ET_DYN) |
||
589 | abfd->flags |= DYNAMIC; |
||
590 | |||
591 | if (i_ehdrp->e_phnum > 0) |
||
592 | abfd->flags |= D_PAGED; |
||
593 | |||
594 | if (! bfd_default_set_arch_mach (abfd, ebd->arch, 0)) |
||
595 | { |
||
596 | /* It's OK if this fails for the generic target. */ |
||
597 | if (ebd->elf_machine_code != EM_NONE) |
||
598 | goto got_no_match; |
||
599 | } |
||
600 | |||
601 | if (ebd->elf_machine_code != EM_NONE |
||
602 | && i_ehdrp->e_ident[EI_OSABI] != ebd->elf_osabi |
||
603 | && ebd->elf_osabi != ELFOSABI_NONE) |
||
604 | goto got_wrong_format_error; |
||
605 | |||
606 | if (i_ehdrp->e_shoff != 0) |
||
607 | { |
||
6324 | serge | 608 | file_ptr where = (file_ptr) i_ehdrp->e_shoff; |
5197 | serge | 609 | |
610 | /* Seek to the section header table in the file. */ |
||
6324 | serge | 611 | if (bfd_seek (abfd, where, SEEK_SET) != 0) |
5197 | serge | 612 | goto got_no_match; |
613 | |||
614 | /* Read the first section header at index 0, and convert to internal |
||
615 | form. */ |
||
616 | if (bfd_bread (&x_shdr, sizeof x_shdr, abfd) != sizeof (x_shdr)) |
||
617 | goto got_no_match; |
||
618 | elf_swap_shdr_in (abfd, &x_shdr, &i_shdr); |
||
619 | |||
620 | /* If the section count is zero, the actual count is in the first |
||
621 | section header. */ |
||
622 | if (i_ehdrp->e_shnum == SHN_UNDEF) |
||
623 | { |
||
624 | i_ehdrp->e_shnum = i_shdr.sh_size; |
||
625 | if (i_ehdrp->e_shnum >= SHN_LORESERVE |
||
626 | || i_ehdrp->e_shnum != i_shdr.sh_size |
||
627 | || i_ehdrp->e_shnum == 0) |
||
628 | goto got_wrong_format_error; |
||
629 | } |
||
630 | |||
631 | /* And similarly for the string table index. */ |
||
632 | if (i_ehdrp->e_shstrndx == (SHN_XINDEX & 0xffff)) |
||
633 | { |
||
634 | i_ehdrp->e_shstrndx = i_shdr.sh_link; |
||
635 | if (i_ehdrp->e_shstrndx != i_shdr.sh_link) |
||
636 | goto got_wrong_format_error; |
||
637 | } |
||
638 | |||
639 | /* And program headers. */ |
||
640 | if (i_ehdrp->e_phnum == PN_XNUM && i_shdr.sh_info != 0) |
||
641 | { |
||
642 | i_ehdrp->e_phnum = i_shdr.sh_info; |
||
643 | if (i_ehdrp->e_phnum != i_shdr.sh_info) |
||
644 | goto got_wrong_format_error; |
||
645 | } |
||
646 | |||
647 | /* Sanity check that we can read all of the section headers. |
||
648 | It ought to be good enough to just read the last one. */ |
||
649 | if (i_ehdrp->e_shnum != 1) |
||
650 | { |
||
651 | /* Check that we don't have a totally silly number of sections. */ |
||
652 | if (i_ehdrp->e_shnum > (unsigned int) -1 / sizeof (x_shdr) |
||
653 | || i_ehdrp->e_shnum > (unsigned int) -1 / sizeof (i_shdr)) |
||
654 | goto got_wrong_format_error; |
||
655 | |||
656 | where += (i_ehdrp->e_shnum - 1) * sizeof (x_shdr); |
||
657 | if ((bfd_size_type) where <= i_ehdrp->e_shoff) |
||
658 | goto got_wrong_format_error; |
||
659 | |||
6324 | serge | 660 | if (bfd_seek (abfd, where, SEEK_SET) != 0) |
5197 | serge | 661 | goto got_no_match; |
662 | if (bfd_bread (&x_shdr, sizeof x_shdr, abfd) != sizeof (x_shdr)) |
||
663 | goto got_no_match; |
||
664 | |||
665 | /* Back to where we were. */ |
||
666 | where = i_ehdrp->e_shoff + sizeof (x_shdr); |
||
6324 | serge | 667 | if (bfd_seek (abfd, where, SEEK_SET) != 0) |
5197 | serge | 668 | goto got_no_match; |
669 | } |
||
670 | } |
||
671 | |||
672 | /* Allocate space for a copy of the section header table in |
||
673 | internal form. */ |
||
674 | if (i_ehdrp->e_shnum != 0) |
||
675 | { |
||
676 | Elf_Internal_Shdr *shdrp; |
||
677 | unsigned int num_sec; |
||
678 | |||
6324 | serge | 679 | #ifndef BFD64 |
680 | if (i_ehdrp->e_shnum > ((bfd_size_type) -1) / sizeof (*i_shdrp)) |
||
681 | goto got_wrong_format_error; |
||
682 | #endif |
||
5197 | serge | 683 | amt = sizeof (*i_shdrp) * i_ehdrp->e_shnum; |
684 | i_shdrp = (Elf_Internal_Shdr *) bfd_alloc (abfd, amt); |
||
685 | if (!i_shdrp) |
||
686 | goto got_no_match; |
||
687 | num_sec = i_ehdrp->e_shnum; |
||
688 | elf_numsections (abfd) = num_sec; |
||
689 | amt = sizeof (i_shdrp) * num_sec; |
||
690 | elf_elfsections (abfd) = (Elf_Internal_Shdr **) bfd_alloc (abfd, amt); |
||
691 | if (!elf_elfsections (abfd)) |
||
692 | goto got_no_match; |
||
693 | |||
694 | memcpy (i_shdrp, &i_shdr, sizeof (*i_shdrp)); |
||
695 | for (shdrp = i_shdrp, shindex = 0; shindex < num_sec; shindex++) |
||
696 | elf_elfsections (abfd)[shindex] = shdrp++; |
||
697 | |||
698 | /* Read in the rest of the section header table and convert it |
||
699 | to internal form. */ |
||
700 | for (shindex = 1; shindex < i_ehdrp->e_shnum; shindex++) |
||
701 | { |
||
702 | if (bfd_bread (&x_shdr, sizeof x_shdr, abfd) != sizeof (x_shdr)) |
||
703 | goto got_no_match; |
||
704 | elf_swap_shdr_in (abfd, &x_shdr, i_shdrp + shindex); |
||
705 | |||
706 | /* Sanity check sh_link and sh_info. */ |
||
707 | if (i_shdrp[shindex].sh_link >= num_sec) |
||
708 | { |
||
709 | /* PR 10478: Accept Solaris binaries with a sh_link |
||
710 | field set to SHN_BEFORE or SHN_AFTER. */ |
||
711 | switch (ebd->elf_machine_code) |
||
712 | { |
||
713 | case EM_386: |
||
6324 | serge | 714 | case EM_IAMCU: |
5197 | serge | 715 | case EM_X86_64: |
716 | case EM_OLD_SPARCV9: |
||
717 | case EM_SPARC32PLUS: |
||
718 | case EM_SPARCV9: |
||
719 | case EM_SPARC: |
||
720 | if (i_shdrp[shindex].sh_link == (SHN_LORESERVE & 0xffff) /* SHN_BEFORE */ |
||
721 | || i_shdrp[shindex].sh_link == ((SHN_LORESERVE + 1) & 0xffff) /* SHN_AFTER */) |
||
722 | break; |
||
723 | /* Otherwise fall through. */ |
||
724 | default: |
||
725 | goto got_wrong_format_error; |
||
726 | } |
||
727 | } |
||
728 | |||
729 | if (((i_shdrp[shindex].sh_flags & SHF_INFO_LINK) |
||
730 | || i_shdrp[shindex].sh_type == SHT_RELA |
||
731 | || i_shdrp[shindex].sh_type == SHT_REL) |
||
732 | && i_shdrp[shindex].sh_info >= num_sec) |
||
733 | goto got_wrong_format_error; |
||
734 | |||
735 | /* If the section is loaded, but not page aligned, clear |
||
736 | D_PAGED. */ |
||
737 | if (i_shdrp[shindex].sh_size != 0 |
||
738 | && (i_shdrp[shindex].sh_flags & SHF_ALLOC) != 0 |
||
739 | && i_shdrp[shindex].sh_type != SHT_NOBITS |
||
740 | && (((i_shdrp[shindex].sh_addr - i_shdrp[shindex].sh_offset) |
||
741 | % ebd->minpagesize) |
||
742 | != 0)) |
||
743 | abfd->flags &= ~D_PAGED; |
||
744 | } |
||
745 | } |
||
746 | |||
747 | /* A further sanity check. */ |
||
748 | if (i_ehdrp->e_shnum != 0) |
||
749 | { |
||
750 | if (i_ehdrp->e_shstrndx >= elf_numsections (abfd)) |
||
751 | { |
||
752 | /* PR 2257: |
||
753 | We used to just goto got_wrong_format_error here |
||
754 | but there are binaries in existance for which this test |
||
755 | will prevent the binutils from working with them at all. |
||
756 | So we are kind, and reset the string index value to 0 |
||
757 | so that at least some processing can be done. */ |
||
758 | i_ehdrp->e_shstrndx = SHN_UNDEF; |
||
759 | _bfd_error_handler (_("warning: %s has a corrupt string table index - ignoring"), abfd->filename); |
||
760 | } |
||
761 | } |
||
762 | else if (i_ehdrp->e_shstrndx != SHN_UNDEF) |
||
763 | goto got_wrong_format_error; |
||
764 | |||
765 | /* Read in the program headers. */ |
||
766 | if (i_ehdrp->e_phnum == 0) |
||
767 | elf_tdata (abfd)->phdr = NULL; |
||
768 | else |
||
769 | { |
||
770 | Elf_Internal_Phdr *i_phdr; |
||
771 | unsigned int i; |
||
772 | |||
6324 | serge | 773 | #ifndef BFD64 |
774 | if (i_ehdrp->e_phnum > ((bfd_size_type) -1) / sizeof (*i_phdr)) |
||
775 | goto got_wrong_format_error; |
||
776 | #endif |
||
777 | amt = i_ehdrp->e_phnum * sizeof (*i_phdr); |
||
5197 | serge | 778 | elf_tdata (abfd)->phdr = (Elf_Internal_Phdr *) bfd_alloc (abfd, amt); |
779 | if (elf_tdata (abfd)->phdr == NULL) |
||
780 | goto got_no_match; |
||
781 | if (bfd_seek (abfd, (file_ptr) i_ehdrp->e_phoff, SEEK_SET) != 0) |
||
782 | goto got_no_match; |
||
783 | i_phdr = elf_tdata (abfd)->phdr; |
||
784 | for (i = 0; i < i_ehdrp->e_phnum; i++, i_phdr++) |
||
785 | { |
||
786 | Elf_External_Phdr x_phdr; |
||
787 | |||
788 | if (bfd_bread (&x_phdr, sizeof x_phdr, abfd) != sizeof x_phdr) |
||
789 | goto got_no_match; |
||
790 | elf_swap_phdr_in (abfd, &x_phdr, i_phdr); |
||
791 | } |
||
792 | } |
||
793 | |||
794 | if (i_ehdrp->e_shstrndx != 0 && i_ehdrp->e_shoff != 0) |
||
795 | { |
||
796 | unsigned int num_sec; |
||
797 | |||
798 | /* Once all of the section headers have been read and converted, we |
||
799 | can start processing them. Note that the first section header is |
||
800 | a dummy placeholder entry, so we ignore it. */ |
||
801 | num_sec = elf_numsections (abfd); |
||
802 | for (shindex = 1; shindex < num_sec; shindex++) |
||
803 | if (!bfd_section_from_shdr (abfd, shindex)) |
||
804 | goto got_no_match; |
||
805 | |||
806 | /* Set up ELF sections for SHF_GROUP and SHF_LINK_ORDER. */ |
||
807 | if (! _bfd_elf_setup_sections (abfd)) |
||
808 | goto got_wrong_format_error; |
||
809 | } |
||
810 | |||
811 | /* Let the backend double check the format and override global |
||
812 | information. */ |
||
813 | if (ebd->elf_backend_object_p) |
||
814 | { |
||
815 | if (! (*ebd->elf_backend_object_p) (abfd)) |
||
816 | goto got_wrong_format_error; |
||
817 | } |
||
818 | |||
819 | /* Remember the entry point specified in the ELF file header. */ |
||
820 | bfd_set_start_address (abfd, i_ehdrp->e_entry); |
||
821 | |||
822 | /* If we have created any reloc sections that are associated with |
||
823 | debugging sections, mark the reloc sections as debugging as well. */ |
||
824 | for (s = abfd->sections; s != NULL; s = s->next) |
||
825 | { |
||
826 | if ((elf_section_data (s)->this_hdr.sh_type == SHT_REL |
||
827 | || elf_section_data (s)->this_hdr.sh_type == SHT_RELA) |
||
828 | && elf_section_data (s)->this_hdr.sh_info > 0) |
||
829 | { |
||
830 | unsigned long targ_index; |
||
831 | asection *targ_sec; |
||
832 | |||
833 | targ_index = elf_section_data (s)->this_hdr.sh_info; |
||
834 | targ_sec = bfd_section_from_elf_index (abfd, targ_index); |
||
835 | if (targ_sec != NULL |
||
836 | && (targ_sec->flags & SEC_DEBUGGING) != 0) |
||
837 | s->flags |= SEC_DEBUGGING; |
||
838 | } |
||
839 | } |
||
840 | return target; |
||
841 | |||
842 | got_wrong_format_error: |
||
843 | bfd_set_error (bfd_error_wrong_format); |
||
844 | |||
845 | got_no_match: |
||
846 | return NULL; |
||
847 | } |
||
848 | |||
849 | /* ELF .o/exec file writing */ |
||
850 | |||
851 | /* Write out the relocs. */ |
||
852 | |||
853 | void |
||
854 | elf_write_relocs (bfd *abfd, asection *sec, void *data) |
||
855 | { |
||
856 | bfd_boolean *failedp = (bfd_boolean *) data; |
||
857 | Elf_Internal_Shdr *rela_hdr; |
||
858 | bfd_vma addr_offset; |
||
859 | void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *); |
||
860 | size_t extsize; |
||
861 | bfd_byte *dst_rela; |
||
862 | unsigned int idx; |
||
863 | asymbol *last_sym; |
||
864 | int last_sym_idx; |
||
865 | |||
866 | /* If we have already failed, don't do anything. */ |
||
867 | if (*failedp) |
||
868 | return; |
||
869 | |||
870 | if ((sec->flags & SEC_RELOC) == 0) |
||
871 | return; |
||
872 | |||
873 | /* The linker backend writes the relocs out itself, and sets the |
||
874 | reloc_count field to zero to inhibit writing them here. Also, |
||
875 | sometimes the SEC_RELOC flag gets set even when there aren't any |
||
876 | relocs. */ |
||
877 | if (sec->reloc_count == 0) |
||
878 | return; |
||
879 | |||
880 | /* If we have opened an existing file for update, reloc_count may be |
||
881 | set even though we are not linking. In that case we have nothing |
||
882 | to do. */ |
||
883 | if (sec->orelocation == NULL) |
||
884 | return; |
||
885 | |||
886 | rela_hdr = elf_section_data (sec)->rela.hdr; |
||
887 | if (rela_hdr == NULL) |
||
888 | rela_hdr = elf_section_data (sec)->rel.hdr; |
||
889 | |||
890 | rela_hdr->sh_size = rela_hdr->sh_entsize * sec->reloc_count; |
||
891 | rela_hdr->contents = (unsigned char *) bfd_alloc (abfd, rela_hdr->sh_size); |
||
892 | if (rela_hdr->contents == NULL) |
||
893 | { |
||
894 | *failedp = TRUE; |
||
895 | return; |
||
896 | } |
||
897 | |||
898 | /* Figure out whether the relocations are RELA or REL relocations. */ |
||
899 | if (rela_hdr->sh_type == SHT_RELA) |
||
900 | { |
||
901 | swap_out = elf_swap_reloca_out; |
||
902 | extsize = sizeof (Elf_External_Rela); |
||
903 | } |
||
904 | else if (rela_hdr->sh_type == SHT_REL) |
||
905 | { |
||
906 | swap_out = elf_swap_reloc_out; |
||
907 | extsize = sizeof (Elf_External_Rel); |
||
908 | } |
||
909 | else |
||
910 | /* Every relocation section should be either an SHT_RELA or an |
||
911 | SHT_REL section. */ |
||
912 | abort (); |
||
913 | |||
914 | /* The address of an ELF reloc is section relative for an object |
||
915 | file, and absolute for an executable file or shared library. |
||
916 | The address of a BFD reloc is always section relative. */ |
||
917 | addr_offset = 0; |
||
918 | if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0) |
||
919 | addr_offset = sec->vma; |
||
920 | |||
921 | /* orelocation has the data, reloc_count has the count... */ |
||
922 | last_sym = 0; |
||
923 | last_sym_idx = 0; |
||
924 | dst_rela = rela_hdr->contents; |
||
925 | |||
926 | for (idx = 0; idx < sec->reloc_count; idx++, dst_rela += extsize) |
||
927 | { |
||
928 | Elf_Internal_Rela src_rela; |
||
929 | arelent *ptr; |
||
930 | asymbol *sym; |
||
931 | int n; |
||
932 | |||
933 | ptr = sec->orelocation[idx]; |
||
934 | sym = *ptr->sym_ptr_ptr; |
||
935 | if (sym == last_sym) |
||
936 | n = last_sym_idx; |
||
937 | else if (bfd_is_abs_section (sym->section) && sym->value == 0) |
||
938 | n = STN_UNDEF; |
||
939 | else |
||
940 | { |
||
941 | last_sym = sym; |
||
942 | n = _bfd_elf_symbol_from_bfd_symbol (abfd, &sym); |
||
943 | if (n < 0) |
||
944 | { |
||
945 | *failedp = TRUE; |
||
946 | return; |
||
947 | } |
||
948 | last_sym_idx = n; |
||
949 | } |
||
950 | |||
951 | if ((*ptr->sym_ptr_ptr)->the_bfd != NULL |
||
952 | && (*ptr->sym_ptr_ptr)->the_bfd->xvec != abfd->xvec |
||
953 | && ! _bfd_elf_validate_reloc (abfd, ptr)) |
||
954 | { |
||
955 | *failedp = TRUE; |
||
956 | return; |
||
957 | } |
||
958 | |||
959 | src_rela.r_offset = ptr->address + addr_offset; |
||
960 | src_rela.r_info = ELF_R_INFO (n, ptr->howto->type); |
||
961 | src_rela.r_addend = ptr->addend; |
||
962 | (*swap_out) (abfd, &src_rela, dst_rela); |
||
963 | } |
||
964 | } |
||
965 | |||
966 | /* Write out the program headers. */ |
||
967 | |||
968 | int |
||
969 | elf_write_out_phdrs (bfd *abfd, |
||
970 | const Elf_Internal_Phdr *phdr, |
||
971 | unsigned int count) |
||
972 | { |
||
973 | while (count--) |
||
974 | { |
||
975 | Elf_External_Phdr extphdr; |
||
976 | elf_swap_phdr_out (abfd, phdr, &extphdr); |
||
977 | if (bfd_bwrite (&extphdr, sizeof (Elf_External_Phdr), abfd) |
||
978 | != sizeof (Elf_External_Phdr)) |
||
979 | return -1; |
||
980 | phdr++; |
||
981 | } |
||
982 | return 0; |
||
983 | } |
||
984 | |||
985 | /* Write out the section headers and the ELF file header. */ |
||
986 | |||
987 | bfd_boolean |
||
988 | elf_write_shdrs_and_ehdr (bfd *abfd) |
||
989 | { |
||
990 | Elf_External_Ehdr x_ehdr; /* Elf file header, external form */ |
||
991 | Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form */ |
||
992 | Elf_External_Shdr *x_shdrp; /* Section header table, external form */ |
||
993 | Elf_Internal_Shdr **i_shdrp; /* Section header table, internal form */ |
||
994 | unsigned int count; |
||
995 | bfd_size_type amt; |
||
996 | |||
997 | i_ehdrp = elf_elfheader (abfd); |
||
998 | i_shdrp = elf_elfsections (abfd); |
||
999 | |||
1000 | /* swap the header before spitting it out... */ |
||
1001 | |||
1002 | #if DEBUG & 1 |
||
1003 | elf_debug_file (i_ehdrp); |
||
1004 | #endif |
||
1005 | elf_swap_ehdr_out (abfd, i_ehdrp, &x_ehdr); |
||
1006 | amt = sizeof (x_ehdr); |
||
1007 | if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0 |
||
1008 | || bfd_bwrite (&x_ehdr, amt, abfd) != amt) |
||
1009 | return FALSE; |
||
1010 | |||
1011 | /* Some fields in the first section header handle overflow of ehdr |
||
1012 | fields. */ |
||
1013 | if (i_ehdrp->e_phnum >= PN_XNUM) |
||
1014 | i_shdrp[0]->sh_info = i_ehdrp->e_phnum; |
||
1015 | if (i_ehdrp->e_shnum >= (SHN_LORESERVE & 0xffff)) |
||
1016 | i_shdrp[0]->sh_size = i_ehdrp->e_shnum; |
||
1017 | if (i_ehdrp->e_shstrndx >= (SHN_LORESERVE & 0xffff)) |
||
1018 | i_shdrp[0]->sh_link = i_ehdrp->e_shstrndx; |
||
1019 | |||
1020 | /* at this point we've concocted all the ELF sections... */ |
||
1021 | amt = i_ehdrp->e_shnum; |
||
1022 | amt *= sizeof (*x_shdrp); |
||
1023 | x_shdrp = (Elf_External_Shdr *) bfd_alloc (abfd, amt); |
||
1024 | if (!x_shdrp) |
||
1025 | return FALSE; |
||
1026 | |||
1027 | for (count = 0; count < i_ehdrp->e_shnum; i_shdrp++, count++) |
||
1028 | { |
||
1029 | #if DEBUG & 2 |
||
1030 | elf_debug_section (count, *i_shdrp); |
||
1031 | #endif |
||
1032 | elf_swap_shdr_out (abfd, *i_shdrp, x_shdrp + count); |
||
1033 | } |
||
1034 | if (bfd_seek (abfd, (file_ptr) i_ehdrp->e_shoff, SEEK_SET) != 0 |
||
1035 | || bfd_bwrite (x_shdrp, amt, abfd) != amt) |
||
1036 | return FALSE; |
||
1037 | |||
1038 | /* need to dump the string table too... */ |
||
1039 | |||
1040 | return TRUE; |
||
1041 | } |
||
1042 | |||
1043 | bfd_boolean |
||
1044 | elf_checksum_contents (bfd *abfd, |
||
1045 | void (*process) (const void *, size_t, void *), |
||
1046 | void *arg) |
||
1047 | { |
||
1048 | Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd); |
||
1049 | Elf_Internal_Shdr **i_shdrp = elf_elfsections (abfd); |
||
1050 | Elf_Internal_Phdr *i_phdrp = elf_tdata (abfd)->phdr; |
||
1051 | unsigned int count, num; |
||
1052 | |||
1053 | { |
||
1054 | Elf_External_Ehdr x_ehdr; |
||
1055 | Elf_Internal_Ehdr i_ehdr; |
||
1056 | |||
1057 | i_ehdr = *i_ehdrp; |
||
1058 | i_ehdr.e_phoff = i_ehdr.e_shoff = 0; |
||
1059 | elf_swap_ehdr_out (abfd, &i_ehdr, &x_ehdr); |
||
1060 | (*process) (&x_ehdr, sizeof x_ehdr, arg); |
||
1061 | } |
||
1062 | |||
1063 | num = i_ehdrp->e_phnum; |
||
1064 | for (count = 0; count < num; count++) |
||
1065 | { |
||
1066 | Elf_External_Phdr x_phdr; |
||
1067 | elf_swap_phdr_out (abfd, &i_phdrp[count], &x_phdr); |
||
1068 | (*process) (&x_phdr, sizeof x_phdr, arg); |
||
1069 | } |
||
1070 | |||
1071 | num = elf_numsections (abfd); |
||
1072 | for (count = 0; count < num; count++) |
||
1073 | { |
||
1074 | Elf_Internal_Shdr i_shdr; |
||
1075 | Elf_External_Shdr x_shdr; |
||
1076 | bfd_byte *contents, *free_contents; |
||
1077 | |||
1078 | i_shdr = *i_shdrp[count]; |
||
1079 | i_shdr.sh_offset = 0; |
||
1080 | |||
1081 | elf_swap_shdr_out (abfd, &i_shdr, &x_shdr); |
||
1082 | (*process) (&x_shdr, sizeof x_shdr, arg); |
||
1083 | |||
1084 | /* Process the section's contents, if it has some. |
||
1085 | PR ld/12451: Read them in if necessary. */ |
||
1086 | if (i_shdr.sh_type == SHT_NOBITS) |
||
1087 | continue; |
||
1088 | free_contents = NULL; |
||
1089 | contents = i_shdr.contents; |
||
1090 | if (contents == NULL) |
||
1091 | { |
||
1092 | asection *sec; |
||
1093 | |||
1094 | sec = bfd_section_from_elf_index (abfd, count); |
||
1095 | if (sec != NULL) |
||
1096 | { |
||
1097 | contents = sec->contents; |
||
1098 | if (contents == NULL) |
||
1099 | { |
||
1100 | /* Force rereading from file. */ |
||
1101 | sec->flags &= ~SEC_IN_MEMORY; |
||
1102 | if (!bfd_malloc_and_get_section (abfd, sec, &free_contents)) |
||
1103 | continue; |
||
1104 | contents = free_contents; |
||
1105 | } |
||
1106 | } |
||
1107 | } |
||
1108 | if (contents != NULL) |
||
1109 | { |
||
1110 | (*process) (contents, i_shdr.sh_size, arg); |
||
1111 | if (free_contents != NULL) |
||
1112 | free (free_contents); |
||
1113 | } |
||
1114 | } |
||
1115 | |||
1116 | return TRUE; |
||
1117 | } |
||
1118 | |||
1119 | long |
||
1120 | elf_slurp_symbol_table (bfd *abfd, asymbol **symptrs, bfd_boolean dynamic) |
||
1121 | { |
||
1122 | Elf_Internal_Shdr *hdr; |
||
1123 | Elf_Internal_Shdr *verhdr; |
||
1124 | unsigned long symcount; /* Number of external ELF symbols */ |
||
1125 | elf_symbol_type *sym; /* Pointer to current bfd symbol */ |
||
1126 | elf_symbol_type *symbase; /* Buffer for generated bfd symbols */ |
||
1127 | Elf_Internal_Sym *isym; |
||
1128 | Elf_Internal_Sym *isymend; |
||
1129 | Elf_Internal_Sym *isymbuf = NULL; |
||
1130 | Elf_External_Versym *xver; |
||
1131 | Elf_External_Versym *xverbuf = NULL; |
||
1132 | const struct elf_backend_data *ebd; |
||
1133 | bfd_size_type amt; |
||
1134 | |||
1135 | /* Read each raw ELF symbol, converting from external ELF form to |
||
1136 | internal ELF form, and then using the information to create a |
||
1137 | canonical bfd symbol table entry. |
||
1138 | |||
1139 | Note that we allocate the initial bfd canonical symbol buffer |
||
1140 | based on a one-to-one mapping of the ELF symbols to canonical |
||
1141 | symbols. We actually use all the ELF symbols, so there will be no |
||
1142 | space left over at the end. When we have all the symbols, we |
||
1143 | build the caller's pointer vector. */ |
||
1144 | |||
1145 | if (! dynamic) |
||
1146 | { |
||
1147 | hdr = &elf_tdata (abfd)->symtab_hdr; |
||
1148 | verhdr = NULL; |
||
1149 | } |
||
1150 | else |
||
1151 | { |
||
1152 | hdr = &elf_tdata (abfd)->dynsymtab_hdr; |
||
1153 | if (elf_dynversym (abfd) == 0) |
||
1154 | verhdr = NULL; |
||
1155 | else |
||
1156 | verhdr = &elf_tdata (abfd)->dynversym_hdr; |
||
1157 | if ((elf_dynverdef (abfd) != 0 |
||
1158 | && elf_tdata (abfd)->verdef == NULL) |
||
1159 | || (elf_dynverref (abfd) != 0 |
||
1160 | && elf_tdata (abfd)->verref == NULL)) |
||
1161 | { |
||
1162 | if (!_bfd_elf_slurp_version_tables (abfd, FALSE)) |
||
1163 | return -1; |
||
1164 | } |
||
1165 | } |
||
1166 | |||
1167 | ebd = get_elf_backend_data (abfd); |
||
1168 | symcount = hdr->sh_size / sizeof (Elf_External_Sym); |
||
1169 | if (symcount == 0) |
||
1170 | sym = symbase = NULL; |
||
1171 | else |
||
1172 | { |
||
1173 | isymbuf = bfd_elf_get_elf_syms (abfd, hdr, symcount, 0, |
||
1174 | NULL, NULL, NULL); |
||
1175 | if (isymbuf == NULL) |
||
1176 | return -1; |
||
1177 | |||
1178 | amt = symcount; |
||
1179 | amt *= sizeof (elf_symbol_type); |
||
1180 | symbase = (elf_symbol_type *) bfd_zalloc (abfd, amt); |
||
1181 | if (symbase == (elf_symbol_type *) NULL) |
||
1182 | goto error_return; |
||
1183 | |||
1184 | /* Read the raw ELF version symbol information. */ |
||
1185 | if (verhdr != NULL |
||
1186 | && verhdr->sh_size / sizeof (Elf_External_Versym) != symcount) |
||
1187 | { |
||
1188 | (*_bfd_error_handler) |
||
1189 | (_("%s: version count (%ld) does not match symbol count (%ld)"), |
||
1190 | abfd->filename, |
||
1191 | (long) (verhdr->sh_size / sizeof (Elf_External_Versym)), |
||
1192 | symcount); |
||
1193 | |||
1194 | /* Slurp in the symbols without the version information, |
||
1195 | since that is more helpful than just quitting. */ |
||
1196 | verhdr = NULL; |
||
1197 | } |
||
1198 | |||
1199 | if (verhdr != NULL) |
||
1200 | { |
||
1201 | if (bfd_seek (abfd, verhdr->sh_offset, SEEK_SET) != 0) |
||
1202 | goto error_return; |
||
1203 | |||
1204 | xverbuf = (Elf_External_Versym *) bfd_malloc (verhdr->sh_size); |
||
1205 | if (xverbuf == NULL && verhdr->sh_size != 0) |
||
1206 | goto error_return; |
||
1207 | |||
1208 | if (bfd_bread (xverbuf, verhdr->sh_size, abfd) != verhdr->sh_size) |
||
1209 | goto error_return; |
||
1210 | } |
||
1211 | |||
1212 | /* Skip first symbol, which is a null dummy. */ |
||
1213 | xver = xverbuf; |
||
1214 | if (xver != NULL) |
||
1215 | ++xver; |
||
1216 | isymend = isymbuf + symcount; |
||
1217 | for (isym = isymbuf + 1, sym = symbase; isym < isymend; isym++, sym++) |
||
1218 | { |
||
1219 | memcpy (&sym->internal_elf_sym, isym, sizeof (Elf_Internal_Sym)); |
||
6324 | serge | 1220 | |
5197 | serge | 1221 | sym->symbol.the_bfd = abfd; |
1222 | sym->symbol.name = bfd_elf_sym_name (abfd, hdr, isym, NULL); |
||
1223 | sym->symbol.value = isym->st_value; |
||
1224 | |||
1225 | if (isym->st_shndx == SHN_UNDEF) |
||
1226 | { |
||
1227 | sym->symbol.section = bfd_und_section_ptr; |
||
1228 | } |
||
1229 | else if (isym->st_shndx == SHN_ABS) |
||
1230 | { |
||
1231 | sym->symbol.section = bfd_abs_section_ptr; |
||
1232 | } |
||
1233 | else if (isym->st_shndx == SHN_COMMON) |
||
1234 | { |
||
1235 | sym->symbol.section = bfd_com_section_ptr; |
||
1236 | if ((abfd->flags & BFD_PLUGIN) != 0) |
||
1237 | { |
||
1238 | asection *xc = bfd_get_section_by_name (abfd, "COMMON"); |
||
1239 | |||
1240 | if (xc == NULL) |
||
1241 | { |
||
1242 | flagword flags = (SEC_ALLOC | SEC_IS_COMMON | SEC_KEEP |
||
1243 | | SEC_EXCLUDE); |
||
1244 | xc = bfd_make_section_with_flags (abfd, "COMMON", flags); |
||
1245 | if (xc == NULL) |
||
1246 | goto error_return; |
||
1247 | } |
||
1248 | sym->symbol.section = xc; |
||
1249 | } |
||
1250 | /* Elf puts the alignment into the `value' field, and |
||
1251 | the size into the `size' field. BFD wants to see the |
||
1252 | size in the value field, and doesn't care (at the |
||
1253 | moment) about the alignment. */ |
||
1254 | sym->symbol.value = isym->st_size; |
||
1255 | } |
||
1256 | else |
||
1257 | { |
||
1258 | sym->symbol.section |
||
1259 | = bfd_section_from_elf_index (abfd, isym->st_shndx); |
||
1260 | if (sym->symbol.section == NULL) |
||
1261 | { |
||
1262 | /* This symbol is in a section for which we did not |
||
1263 | create a BFD section. Just use bfd_abs_section, |
||
1264 | although it is wrong. FIXME. */ |
||
1265 | sym->symbol.section = bfd_abs_section_ptr; |
||
1266 | } |
||
1267 | } |
||
1268 | |||
1269 | /* If this is a relocatable file, then the symbol value is |
||
1270 | already section relative. */ |
||
1271 | if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0) |
||
1272 | sym->symbol.value -= sym->symbol.section->vma; |
||
1273 | |||
1274 | switch (ELF_ST_BIND (isym->st_info)) |
||
1275 | { |
||
1276 | case STB_LOCAL: |
||
1277 | sym->symbol.flags |= BSF_LOCAL; |
||
1278 | break; |
||
1279 | case STB_GLOBAL: |
||
1280 | if (isym->st_shndx != SHN_UNDEF && isym->st_shndx != SHN_COMMON) |
||
1281 | sym->symbol.flags |= BSF_GLOBAL; |
||
1282 | break; |
||
1283 | case STB_WEAK: |
||
1284 | sym->symbol.flags |= BSF_WEAK; |
||
1285 | break; |
||
1286 | case STB_GNU_UNIQUE: |
||
1287 | sym->symbol.flags |= BSF_GNU_UNIQUE; |
||
1288 | break; |
||
1289 | } |
||
1290 | |||
1291 | switch (ELF_ST_TYPE (isym->st_info)) |
||
1292 | { |
||
1293 | case STT_SECTION: |
||
1294 | sym->symbol.flags |= BSF_SECTION_SYM | BSF_DEBUGGING; |
||
1295 | break; |
||
1296 | case STT_FILE: |
||
1297 | sym->symbol.flags |= BSF_FILE | BSF_DEBUGGING; |
||
1298 | break; |
||
1299 | case STT_FUNC: |
||
1300 | sym->symbol.flags |= BSF_FUNCTION; |
||
1301 | break; |
||
1302 | case STT_COMMON: |
||
1303 | /* FIXME: Do we have to put the size field into the value field |
||
1304 | as we do with symbols in SHN_COMMON sections (see above) ? */ |
||
1305 | /* Fall through. */ |
||
1306 | case STT_OBJECT: |
||
1307 | sym->symbol.flags |= BSF_OBJECT; |
||
1308 | break; |
||
1309 | case STT_TLS: |
||
1310 | sym->symbol.flags |= BSF_THREAD_LOCAL; |
||
1311 | break; |
||
1312 | case STT_RELC: |
||
1313 | sym->symbol.flags |= BSF_RELC; |
||
1314 | break; |
||
1315 | case STT_SRELC: |
||
1316 | sym->symbol.flags |= BSF_SRELC; |
||
1317 | break; |
||
1318 | case STT_GNU_IFUNC: |
||
1319 | sym->symbol.flags |= BSF_GNU_INDIRECT_FUNCTION; |
||
1320 | break; |
||
1321 | } |
||
1322 | |||
1323 | if (dynamic) |
||
1324 | sym->symbol.flags |= BSF_DYNAMIC; |
||
1325 | |||
1326 | if (xver != NULL) |
||
1327 | { |
||
1328 | Elf_Internal_Versym iversym; |
||
1329 | |||
1330 | _bfd_elf_swap_versym_in (abfd, xver, &iversym); |
||
1331 | sym->version = iversym.vs_vers; |
||
1332 | xver++; |
||
1333 | } |
||
1334 | |||
1335 | /* Do some backend-specific processing on this symbol. */ |
||
1336 | if (ebd->elf_backend_symbol_processing) |
||
1337 | (*ebd->elf_backend_symbol_processing) (abfd, &sym->symbol); |
||
1338 | } |
||
1339 | } |
||
1340 | |||
1341 | /* Do some backend-specific processing on this symbol table. */ |
||
1342 | if (ebd->elf_backend_symbol_table_processing) |
||
1343 | (*ebd->elf_backend_symbol_table_processing) (abfd, symbase, symcount); |
||
1344 | |||
1345 | /* We rely on the zalloc to clear out the final symbol entry. */ |
||
1346 | |||
1347 | symcount = sym - symbase; |
||
1348 | |||
1349 | /* Fill in the user's symbol pointer vector if needed. */ |
||
1350 | if (symptrs) |
||
1351 | { |
||
1352 | long l = symcount; |
||
1353 | |||
1354 | sym = symbase; |
||
1355 | while (l-- > 0) |
||
1356 | { |
||
1357 | *symptrs++ = &sym->symbol; |
||
1358 | sym++; |
||
1359 | } |
||
1360 | *symptrs = 0; /* Final null pointer */ |
||
1361 | } |
||
1362 | |||
1363 | if (xverbuf != NULL) |
||
1364 | free (xverbuf); |
||
1365 | if (isymbuf != NULL && hdr->contents != (unsigned char *) isymbuf) |
||
1366 | free (isymbuf); |
||
1367 | return symcount; |
||
1368 | |||
1369 | error_return: |
||
1370 | if (xverbuf != NULL) |
||
1371 | free (xverbuf); |
||
1372 | if (isymbuf != NULL && hdr->contents != (unsigned char *) isymbuf) |
||
1373 | free (isymbuf); |
||
1374 | return -1; |
||
1375 | } |
||
1376 | |||
1377 | /* Read relocations for ASECT from REL_HDR. There are RELOC_COUNT of |
||
1378 | them. */ |
||
1379 | |||
1380 | static bfd_boolean |
||
1381 | elf_slurp_reloc_table_from_section (bfd *abfd, |
||
1382 | asection *asect, |
||
1383 | Elf_Internal_Shdr *rel_hdr, |
||
1384 | bfd_size_type reloc_count, |
||
1385 | arelent *relents, |
||
1386 | asymbol **symbols, |
||
1387 | bfd_boolean dynamic) |
||
1388 | { |
||
1389 | const struct elf_backend_data * const ebd = get_elf_backend_data (abfd); |
||
1390 | void *allocated = NULL; |
||
1391 | bfd_byte *native_relocs; |
||
1392 | arelent *relent; |
||
1393 | unsigned int i; |
||
1394 | int entsize; |
||
1395 | unsigned int symcount; |
||
1396 | |||
1397 | allocated = bfd_malloc (rel_hdr->sh_size); |
||
1398 | if (allocated == NULL) |
||
1399 | goto error_return; |
||
1400 | |||
1401 | if (bfd_seek (abfd, rel_hdr->sh_offset, SEEK_SET) != 0 |
||
1402 | || (bfd_bread (allocated, rel_hdr->sh_size, abfd) |
||
1403 | != rel_hdr->sh_size)) |
||
1404 | goto error_return; |
||
1405 | |||
1406 | native_relocs = (bfd_byte *) allocated; |
||
1407 | |||
1408 | entsize = rel_hdr->sh_entsize; |
||
1409 | BFD_ASSERT (entsize == sizeof (Elf_External_Rel) |
||
1410 | || entsize == sizeof (Elf_External_Rela)); |
||
1411 | |||
1412 | if (dynamic) |
||
1413 | symcount = bfd_get_dynamic_symcount (abfd); |
||
1414 | else |
||
1415 | symcount = bfd_get_symcount (abfd); |
||
1416 | |||
1417 | for (i = 0, relent = relents; |
||
1418 | i < reloc_count; |
||
1419 | i++, relent++, native_relocs += entsize) |
||
1420 | { |
||
1421 | Elf_Internal_Rela rela; |
||
1422 | |||
1423 | if (entsize == sizeof (Elf_External_Rela)) |
||
1424 | elf_swap_reloca_in (abfd, native_relocs, &rela); |
||
1425 | else |
||
1426 | elf_swap_reloc_in (abfd, native_relocs, &rela); |
||
1427 | |||
1428 | /* The address of an ELF reloc is section relative for an object |
||
1429 | file, and absolute for an executable file or shared library. |
||
1430 | The address of a normal BFD reloc is always section relative, |
||
1431 | and the address of a dynamic reloc is absolute.. */ |
||
1432 | if ((abfd->flags & (EXEC_P | DYNAMIC)) == 0 || dynamic) |
||
1433 | relent->address = rela.r_offset; |
||
1434 | else |
||
1435 | relent->address = rela.r_offset - asect->vma; |
||
1436 | |||
1437 | if (ELF_R_SYM (rela.r_info) == STN_UNDEF) |
||
1438 | relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr; |
||
1439 | else if (ELF_R_SYM (rela.r_info) > symcount) |
||
1440 | { |
||
1441 | (*_bfd_error_handler) |
||
1442 | (_("%s(%s): relocation %d has invalid symbol index %ld"), |
||
1443 | abfd->filename, asect->name, i, ELF_R_SYM (rela.r_info)); |
||
1444 | relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr; |
||
1445 | } |
||
1446 | else |
||
1447 | { |
||
1448 | asymbol **ps; |
||
1449 | |||
1450 | ps = symbols + ELF_R_SYM (rela.r_info) - 1; |
||
1451 | |||
1452 | relent->sym_ptr_ptr = ps; |
||
1453 | } |
||
1454 | |||
1455 | relent->addend = rela.r_addend; |
||
1456 | |||
1457 | if ((entsize == sizeof (Elf_External_Rela) |
||
1458 | && ebd->elf_info_to_howto != NULL) |
||
1459 | || ebd->elf_info_to_howto_rel == NULL) |
||
1460 | (*ebd->elf_info_to_howto) (abfd, relent, &rela); |
||
1461 | else |
||
1462 | (*ebd->elf_info_to_howto_rel) (abfd, relent, &rela); |
||
1463 | } |
||
1464 | |||
1465 | if (allocated != NULL) |
||
1466 | free (allocated); |
||
1467 | |||
1468 | return TRUE; |
||
1469 | |||
1470 | error_return: |
||
1471 | if (allocated != NULL) |
||
1472 | free (allocated); |
||
1473 | return FALSE; |
||
1474 | } |
||
1475 | |||
1476 | /* Read in and swap the external relocs. */ |
||
1477 | |||
1478 | bfd_boolean |
||
1479 | elf_slurp_reloc_table (bfd *abfd, |
||
1480 | asection *asect, |
||
1481 | asymbol **symbols, |
||
1482 | bfd_boolean dynamic) |
||
1483 | { |
||
1484 | struct bfd_elf_section_data * const d = elf_section_data (asect); |
||
1485 | Elf_Internal_Shdr *rel_hdr; |
||
1486 | Elf_Internal_Shdr *rel_hdr2; |
||
1487 | bfd_size_type reloc_count; |
||
1488 | bfd_size_type reloc_count2; |
||
1489 | arelent *relents; |
||
1490 | bfd_size_type amt; |
||
1491 | |||
1492 | if (asect->relocation != NULL) |
||
1493 | return TRUE; |
||
1494 | |||
1495 | if (! dynamic) |
||
1496 | { |
||
1497 | if ((asect->flags & SEC_RELOC) == 0 |
||
1498 | || asect->reloc_count == 0) |
||
1499 | return TRUE; |
||
1500 | |||
1501 | rel_hdr = d->rel.hdr; |
||
1502 | reloc_count = rel_hdr ? NUM_SHDR_ENTRIES (rel_hdr) : 0; |
||
1503 | rel_hdr2 = d->rela.hdr; |
||
1504 | reloc_count2 = rel_hdr2 ? NUM_SHDR_ENTRIES (rel_hdr2) : 0; |
||
1505 | |||
6324 | serge | 1506 | /* PR 17512: file: 0b4f81b7. */ |
1507 | if (asect->reloc_count != reloc_count + reloc_count2) |
||
1508 | return FALSE; |
||
5197 | serge | 1509 | BFD_ASSERT ((rel_hdr && asect->rel_filepos == rel_hdr->sh_offset) |
1510 | || (rel_hdr2 && asect->rel_filepos == rel_hdr2->sh_offset)); |
||
1511 | |||
1512 | } |
||
1513 | else |
||
1514 | { |
||
1515 | /* Note that ASECT->RELOC_COUNT tends not to be accurate in this |
||
1516 | case because relocations against this section may use the |
||
1517 | dynamic symbol table, and in that case bfd_section_from_shdr |
||
1518 | in elf.c does not update the RELOC_COUNT. */ |
||
1519 | if (asect->size == 0) |
||
1520 | return TRUE; |
||
1521 | |||
1522 | rel_hdr = &d->this_hdr; |
||
1523 | reloc_count = NUM_SHDR_ENTRIES (rel_hdr); |
||
1524 | rel_hdr2 = NULL; |
||
1525 | reloc_count2 = 0; |
||
1526 | } |
||
1527 | |||
1528 | amt = (reloc_count + reloc_count2) * sizeof (arelent); |
||
1529 | relents = (arelent *) bfd_alloc (abfd, amt); |
||
1530 | if (relents == NULL) |
||
1531 | return FALSE; |
||
1532 | |||
1533 | if (rel_hdr |
||
1534 | && !elf_slurp_reloc_table_from_section (abfd, asect, |
||
1535 | rel_hdr, reloc_count, |
||
1536 | relents, |
||
1537 | symbols, dynamic)) |
||
1538 | return FALSE; |
||
1539 | |||
1540 | if (rel_hdr2 |
||
1541 | && !elf_slurp_reloc_table_from_section (abfd, asect, |
||
1542 | rel_hdr2, reloc_count2, |
||
1543 | relents + reloc_count, |
||
1544 | symbols, dynamic)) |
||
1545 | return FALSE; |
||
1546 | |||
1547 | asect->relocation = relents; |
||
1548 | return TRUE; |
||
1549 | } |
||
1550 | |||
1551 | #if DEBUG & 2 |
||
1552 | static void |
||
1553 | elf_debug_section (int num, Elf_Internal_Shdr *hdr) |
||
1554 | { |
||
1555 | fprintf (stderr, "\nSection#%d '%s' 0x%.8lx\n", num, |
||
1556 | hdr->bfd_section != NULL ? hdr->bfd_section->name : "", |
||
1557 | (long) hdr); |
||
1558 | fprintf (stderr, |
||
1559 | "sh_name = %ld\tsh_type = %ld\tsh_flags = %ld\n", |
||
1560 | (long) hdr->sh_name, |
||
1561 | (long) hdr->sh_type, |
||
1562 | (long) hdr->sh_flags); |
||
1563 | fprintf (stderr, |
||
1564 | "sh_addr = %ld\tsh_offset = %ld\tsh_size = %ld\n", |
||
1565 | (long) hdr->sh_addr, |
||
1566 | (long) hdr->sh_offset, |
||
1567 | (long) hdr->sh_size); |
||
1568 | fprintf (stderr, |
||
1569 | "sh_link = %ld\tsh_info = %ld\tsh_addralign = %ld\n", |
||
1570 | (long) hdr->sh_link, |
||
1571 | (long) hdr->sh_info, |
||
1572 | (long) hdr->sh_addralign); |
||
1573 | fprintf (stderr, "sh_entsize = %ld\n", |
||
1574 | (long) hdr->sh_entsize); |
||
1575 | fflush (stderr); |
||
1576 | } |
||
1577 | #endif |
||
1578 | |||
1579 | #if DEBUG & 1 |
||
1580 | static void |
||
1581 | elf_debug_file (Elf_Internal_Ehdr *ehdrp) |
||
1582 | { |
||
1583 | fprintf (stderr, "e_entry = 0x%.8lx\n", (long) ehdrp->e_entry); |
||
1584 | fprintf (stderr, "e_phoff = %ld\n", (long) ehdrp->e_phoff); |
||
1585 | fprintf (stderr, "e_phnum = %ld\n", (long) ehdrp->e_phnum); |
||
1586 | fprintf (stderr, "e_phentsize = %ld\n", (long) ehdrp->e_phentsize); |
||
1587 | fprintf (stderr, "e_shoff = %ld\n", (long) ehdrp->e_shoff); |
||
1588 | fprintf (stderr, "e_shnum = %ld\n", (long) ehdrp->e_shnum); |
||
1589 | fprintf (stderr, "e_shentsize = %ld\n", (long) ehdrp->e_shentsize); |
||
1590 | } |
||
1591 | #endif |
||
1592 | |||
1593 | /* Create a new BFD as if by bfd_openr. Rather than opening a file, |
||
6324 | serge | 1594 | reconstruct an ELF file by reading the segments out of remote |
1595 | memory based on the ELF file header at EHDR_VMA and the ELF program |
||
1596 | headers it points to. If non-zero, SIZE is the known extent of the |
||
1597 | object. If not null, *LOADBASEP is filled in with the difference |
||
1598 | between the VMAs from which the segments were read, and the VMAs |
||
1599 | the file headers (and hence BFD's idea of each section's VMA) put |
||
1600 | them at. |
||
5197 | serge | 1601 | |
6324 | serge | 1602 | The function TARGET_READ_MEMORY is called to copy LEN bytes from |
1603 | the remote memory at target address VMA into the local buffer at |
||
1604 | MYADDR; it should return zero on success or an `errno' code on |
||
1605 | failure. TEMPL must be a BFD for a target with the word size and |
||
1606 | byte order found in the remote memory. */ |
||
5197 | serge | 1607 | |
1608 | bfd * |
||
1609 | NAME(_bfd_elf,bfd_from_remote_memory) |
||
1610 | (bfd *templ, |
||
1611 | bfd_vma ehdr_vma, |
||
6324 | serge | 1612 | bfd_size_type size, |
5197 | serge | 1613 | bfd_vma *loadbasep, |
1614 | int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type)) |
||
1615 | { |
||
1616 | Elf_External_Ehdr x_ehdr; /* Elf file header, external form */ |
||
1617 | Elf_Internal_Ehdr i_ehdr; /* Elf file header, internal form */ |
||
1618 | Elf_External_Phdr *x_phdrs; |
||
6324 | serge | 1619 | Elf_Internal_Phdr *i_phdrs, *last_phdr, *first_phdr; |
5197 | serge | 1620 | bfd *nbfd; |
1621 | struct bfd_in_memory *bim; |
||
1622 | bfd_byte *contents; |
||
1623 | int err; |
||
1624 | unsigned int i; |
||
6324 | serge | 1625 | bfd_vma high_offset; |
1626 | bfd_vma shdr_end; |
||
5197 | serge | 1627 | bfd_vma loadbase; |
1628 | |||
1629 | /* Read in the ELF header in external format. */ |
||
1630 | err = target_read_memory (ehdr_vma, (bfd_byte *) &x_ehdr, sizeof x_ehdr); |
||
1631 | if (err) |
||
1632 | { |
||
1633 | bfd_set_error (bfd_error_system_call); |
||
1634 | errno = err; |
||
1635 | return NULL; |
||
1636 | } |
||
1637 | |||
1638 | /* Now check to see if we have a valid ELF file, and one that BFD can |
||
1639 | make use of. The magic number must match, the address size ('class') |
||
1640 | and byte-swapping must match our XVEC entry. */ |
||
1641 | |||
1642 | if (! elf_file_p (&x_ehdr) |
||
1643 | || x_ehdr.e_ident[EI_VERSION] != EV_CURRENT |
||
1644 | || x_ehdr.e_ident[EI_CLASS] != ELFCLASS) |
||
1645 | { |
||
1646 | bfd_set_error (bfd_error_wrong_format); |
||
1647 | return NULL; |
||
1648 | } |
||
1649 | |||
1650 | /* Check that file's byte order matches xvec's */ |
||
1651 | switch (x_ehdr.e_ident[EI_DATA]) |
||
1652 | { |
||
1653 | case ELFDATA2MSB: /* Big-endian */ |
||
1654 | if (! bfd_header_big_endian (templ)) |
||
1655 | { |
||
1656 | bfd_set_error (bfd_error_wrong_format); |
||
1657 | return NULL; |
||
1658 | } |
||
1659 | break; |
||
1660 | case ELFDATA2LSB: /* Little-endian */ |
||
1661 | if (! bfd_header_little_endian (templ)) |
||
1662 | { |
||
1663 | bfd_set_error (bfd_error_wrong_format); |
||
1664 | return NULL; |
||
1665 | } |
||
1666 | break; |
||
1667 | case ELFDATANONE: /* No data encoding specified */ |
||
1668 | default: /* Unknown data encoding specified */ |
||
1669 | bfd_set_error (bfd_error_wrong_format); |
||
1670 | return NULL; |
||
1671 | } |
||
1672 | |||
1673 | elf_swap_ehdr_in (templ, &x_ehdr, &i_ehdr); |
||
1674 | |||
1675 | /* The file header tells where to find the program headers. |
||
1676 | These are what we use to actually choose what to read. */ |
||
1677 | |||
1678 | if (i_ehdr.e_phentsize != sizeof (Elf_External_Phdr) || i_ehdr.e_phnum == 0) |
||
1679 | { |
||
1680 | bfd_set_error (bfd_error_wrong_format); |
||
1681 | return NULL; |
||
1682 | } |
||
1683 | |||
1684 | x_phdrs = (Elf_External_Phdr *) |
||
1685 | bfd_malloc (i_ehdr.e_phnum * (sizeof *x_phdrs + sizeof *i_phdrs)); |
||
1686 | if (x_phdrs == NULL) |
||
6324 | serge | 1687 | return NULL; |
5197 | serge | 1688 | err = target_read_memory (ehdr_vma + i_ehdr.e_phoff, (bfd_byte *) x_phdrs, |
1689 | i_ehdr.e_phnum * sizeof x_phdrs[0]); |
||
1690 | if (err) |
||
1691 | { |
||
1692 | free (x_phdrs); |
||
1693 | bfd_set_error (bfd_error_system_call); |
||
1694 | errno = err; |
||
1695 | return NULL; |
||
1696 | } |
||
1697 | i_phdrs = (Elf_Internal_Phdr *) &x_phdrs[i_ehdr.e_phnum]; |
||
1698 | |||
6324 | serge | 1699 | high_offset = 0; |
1700 | loadbase = 0; |
||
1701 | first_phdr = NULL; |
||
5197 | serge | 1702 | last_phdr = NULL; |
1703 | for (i = 0; i < i_ehdr.e_phnum; ++i) |
||
1704 | { |
||
1705 | elf_swap_phdr_in (templ, &x_phdrs[i], &i_phdrs[i]); |
||
1706 | if (i_phdrs[i].p_type == PT_LOAD) |
||
1707 | { |
||
6324 | serge | 1708 | bfd_vma segment_end = i_phdrs[i].p_offset + i_phdrs[i].p_filesz; |
5197 | serge | 1709 | |
6324 | serge | 1710 | if (segment_end > high_offset) |
5197 | serge | 1711 | { |
6324 | serge | 1712 | high_offset = segment_end; |
1713 | last_phdr = &i_phdrs[i]; |
||
5197 | serge | 1714 | } |
1715 | |||
6324 | serge | 1716 | /* If this program header covers offset zero, where the file |
1717 | header sits, then we can figure out the loadbase. */ |
||
1718 | if (first_phdr == NULL) |
||
1719 | { |
||
1720 | bfd_vma p_offset = i_phdrs[i].p_offset; |
||
1721 | bfd_vma p_vaddr = i_phdrs[i].p_vaddr; |
||
1722 | |||
1723 | if (i_phdrs[i].p_align > 1) |
||
1724 | { |
||
1725 | p_offset &= -i_phdrs[i].p_align; |
||
1726 | p_vaddr &= -i_phdrs[i].p_align; |
||
1727 | } |
||
1728 | if (p_offset == 0) |
||
1729 | { |
||
1730 | loadbase = ehdr_vma - p_vaddr; |
||
1731 | first_phdr = &i_phdrs[i]; |
||
1732 | } |
||
1733 | } |
||
5197 | serge | 1734 | } |
1735 | } |
||
6324 | serge | 1736 | if (high_offset == 0) |
5197 | serge | 1737 | { |
1738 | /* There were no PT_LOAD segments, so we don't have anything to read. */ |
||
1739 | free (x_phdrs); |
||
1740 | bfd_set_error (bfd_error_wrong_format); |
||
1741 | return NULL; |
||
1742 | } |
||
1743 | |||
6324 | serge | 1744 | shdr_end = 0; |
1745 | if (i_ehdr.e_shoff != 0 && i_ehdr.e_shnum != 0 && i_ehdr.e_shentsize != 0) |
||
5197 | serge | 1746 | { |
6324 | serge | 1747 | shdr_end = i_ehdr.e_shoff + i_ehdr.e_shnum * i_ehdr.e_shentsize; |
1748 | |||
1749 | if (last_phdr->p_filesz != last_phdr->p_memsz) |
||
1750 | { |
||
1751 | /* If the last PT_LOAD header has a bss area then ld.so will |
||
1752 | have cleared anything past p_filesz, zapping the section |
||
1753 | headers. */ |
||
1754 | } |
||
1755 | else if (size >= shdr_end) |
||
1756 | high_offset = size; |
||
1757 | else |
||
1758 | { |
||
1759 | bfd_vma page_size = get_elf_backend_data (templ)->minpagesize; |
||
1760 | bfd_vma segment_end = last_phdr->p_offset + last_phdr->p_filesz; |
||
1761 | |||
1762 | /* Assume we loaded full pages, allowing us to sometimes see |
||
1763 | section headers. */ |
||
1764 | if (page_size > 1 && shdr_end > segment_end) |
||
1765 | { |
||
1766 | bfd_vma page_end = (segment_end + page_size - 1) & -page_size; |
||
1767 | |||
1768 | if (page_end >= shdr_end) |
||
1769 | /* Whee, section headers covered. */ |
||
1770 | high_offset = shdr_end; |
||
1771 | } |
||
1772 | } |
||
5197 | serge | 1773 | } |
1774 | |||
1775 | /* Now we know the size of the whole image we want read in. */ |
||
6324 | serge | 1776 | contents = (bfd_byte *) bfd_zmalloc (high_offset); |
5197 | serge | 1777 | if (contents == NULL) |
1778 | { |
||
1779 | free (x_phdrs); |
||
1780 | return NULL; |
||
1781 | } |
||
1782 | |||
1783 | for (i = 0; i < i_ehdr.e_phnum; ++i) |
||
1784 | if (i_phdrs[i].p_type == PT_LOAD) |
||
1785 | { |
||
6324 | serge | 1786 | bfd_vma start = i_phdrs[i].p_offset; |
1787 | bfd_vma end = start + i_phdrs[i].p_filesz; |
||
1788 | bfd_vma vaddr = i_phdrs[i].p_vaddr; |
||
1789 | |||
1790 | /* Extend the beginning of the first pt_load to cover file |
||
1791 | header and program headers, if we proved earlier that its |
||
1792 | aligned offset is 0. */ |
||
1793 | if (first_phdr == &i_phdrs[i]) |
||
1794 | { |
||
1795 | vaddr -= start; |
||
1796 | start = 0; |
||
1797 | } |
||
1798 | /* Extend the end of the last pt_load to cover section headers. */ |
||
1799 | if (last_phdr == &i_phdrs[i]) |
||
1800 | end = high_offset; |
||
1801 | err = target_read_memory (loadbase + vaddr, |
||
5197 | serge | 1802 | contents + start, end - start); |
1803 | if (err) |
||
1804 | { |
||
1805 | free (x_phdrs); |
||
1806 | free (contents); |
||
1807 | bfd_set_error (bfd_error_system_call); |
||
1808 | errno = err; |
||
1809 | return NULL; |
||
1810 | } |
||
1811 | } |
||
1812 | free (x_phdrs); |
||
1813 | |||
1814 | /* If the segments visible in memory didn't include the section headers, |
||
1815 | then clear them from the file header. */ |
||
6324 | serge | 1816 | if (high_offset < shdr_end) |
5197 | serge | 1817 | { |
1818 | memset (&x_ehdr.e_shoff, 0, sizeof x_ehdr.e_shoff); |
||
1819 | memset (&x_ehdr.e_shnum, 0, sizeof x_ehdr.e_shnum); |
||
1820 | memset (&x_ehdr.e_shstrndx, 0, sizeof x_ehdr.e_shstrndx); |
||
1821 | } |
||
1822 | |||
1823 | /* This will normally have been in the first PT_LOAD segment. But it |
||
1824 | conceivably could be missing, and we might have just changed it. */ |
||
1825 | memcpy (contents, &x_ehdr, sizeof x_ehdr); |
||
1826 | |||
1827 | /* Now we have a memory image of the ELF file contents. Make a BFD. */ |
||
1828 | bim = (struct bfd_in_memory *) bfd_malloc (sizeof (struct bfd_in_memory)); |
||
1829 | if (bim == NULL) |
||
1830 | { |
||
1831 | free (contents); |
||
1832 | return NULL; |
||
1833 | } |
||
1834 | nbfd = _bfd_new_bfd (); |
||
1835 | if (nbfd == NULL) |
||
1836 | { |
||
1837 | free (bim); |
||
1838 | free (contents); |
||
1839 | return NULL; |
||
1840 | } |
||
6324 | serge | 1841 | nbfd->filename = xstrdup (" |
5197 | serge | 1842 | nbfd->xvec = templ->xvec; |
6324 | serge | 1843 | bim->size = high_offset; |
5197 | serge | 1844 | bim->buffer = contents; |
1845 | nbfd->iostream = bim; |
||
1846 | nbfd->flags = BFD_IN_MEMORY; |
||
1847 | nbfd->iovec = &_bfd_memory_iovec; |
||
1848 | nbfd->origin = 0; |
||
1849 | nbfd->direction = read_direction; |
||
1850 | nbfd->mtime = time (NULL); |
||
1851 | nbfd->mtime_set = TRUE; |
||
1852 | |||
1853 | if (loadbasep) |
||
1854 | *loadbasep = loadbase; |
||
1855 | return nbfd; |
||
1856 | } |
||
1857 | |||
1858 | /* Function for ELF_R_INFO. */ |
||
1859 | |||
1860 | bfd_vma |
||
1861 | NAME(elf,r_info) (bfd_vma sym, bfd_vma type) |
||
1862 | { |
||
1863 | return ELF_R_INFO (sym, type); |
||
1864 | } |
||
1865 | |||
1866 | /* Function for ELF_R_SYM. */ |
||
1867 | |||
1868 | bfd_vma |
||
1869 | NAME(elf,r_sym) (bfd_vma r_info) |
||
1870 | { |
||
1871 | return ELF_R_SYM (r_info); |
||
1872 | } |
||
1873 | |||
1874 | #include "elfcore.h" |
||
1875 | |||
1876 | /* Size-dependent data and functions. */ |
||
1877 | const struct elf_size_info NAME(_bfd_elf,size_info) = { |
||
1878 | sizeof (Elf_External_Ehdr), |
||
1879 | sizeof (Elf_External_Phdr), |
||
1880 | sizeof (Elf_External_Shdr), |
||
1881 | sizeof (Elf_External_Rel), |
||
1882 | sizeof (Elf_External_Rela), |
||
1883 | sizeof (Elf_External_Sym), |
||
1884 | sizeof (Elf_External_Dyn), |
||
1885 | sizeof (Elf_External_Note), |
||
1886 | 4, |
||
1887 | 1, |
||
1888 | ARCH_SIZE, LOG_FILE_ALIGN, |
||
1889 | ELFCLASS, EV_CURRENT, |
||
1890 | elf_write_out_phdrs, |
||
1891 | elf_write_shdrs_and_ehdr, |
||
1892 | elf_checksum_contents, |
||
1893 | elf_write_relocs, |
||
1894 | elf_swap_symbol_in, |
||
1895 | elf_swap_symbol_out, |
||
1896 | elf_slurp_reloc_table, |
||
1897 | elf_slurp_symbol_table, |
||
1898 | elf_swap_dyn_in, |
||
1899 | elf_swap_dyn_out, |
||
1900 | elf_swap_reloc_in, |
||
1901 | elf_swap_reloc_out, |
||
1902 | elf_swap_reloca_in, |
||
1903 | elf_swap_reloca_out |
||
1904 | };>>>>>>>>>>>>>>=>> |