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5197 | serge | 1 | /* ELF executable support for BFD. |
2 | Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, |
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3 | 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 |
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4 | Free Software Foundation, Inc. |
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5 | |||
6 | Written by Fred Fish @ Cygnus Support, from information published |
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7 | in "UNIX System V Release 4, Programmers Guide: ANSI C and |
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8 | Programming Support Tools". Sufficient support for gdb. |
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9 | |||
10 | Rewritten by Mark Eichin @ Cygnus Support, from information |
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11 | published in "System V Application Binary Interface", chapters 4 |
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12 | and 5, as well as the various "Processor Supplement" documents |
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13 | derived from it. Added support for assembler and other object file |
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14 | utilities. Further work done by Ken Raeburn (Cygnus Support), Michael |
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15 | Meissner (Open Software Foundation), and Peter Hoogenboom (University |
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16 | of Utah) to finish and extend this. |
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17 | |||
18 | This file is part of BFD, the Binary File Descriptor library. |
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19 | |||
20 | This program is free software; you can redistribute it and/or modify |
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21 | it under the terms of the GNU General Public License as published by |
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22 | the Free Software Foundation; either version 3 of the License, or |
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23 | (at your option) any later version. |
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24 | |||
25 | This program is distributed in the hope that it will be useful, |
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26 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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27 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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28 | GNU General Public License for more details. |
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29 | |||
30 | You should have received a copy of the GNU General Public License |
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31 | along with this program; if not, write to the Free Software |
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32 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
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33 | MA 02110-1301, USA. */ |
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34 | |||
35 | |||
36 | /* Problems and other issues to resolve. |
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37 | |||
38 | (1) BFD expects there to be some fixed number of "sections" in |
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39 | the object file. I.E. there is a "section_count" variable in the |
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40 | bfd structure which contains the number of sections. However, ELF |
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41 | supports multiple "views" of a file. In particular, with current |
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42 | implementations, executable files typically have two tables, a |
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43 | program header table and a section header table, both of which |
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44 | partition the executable. |
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45 | |||
46 | In ELF-speak, the "linking view" of the file uses the section header |
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47 | table to access "sections" within the file, and the "execution view" |
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48 | uses the program header table to access "segments" within the file. |
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49 | "Segments" typically may contain all the data from one or more |
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50 | "sections". |
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51 | |||
52 | Note that the section header table is optional in ELF executables, |
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53 | but it is this information that is most useful to gdb. If the |
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54 | section header table is missing, then gdb should probably try |
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55 | to make do with the program header table. (FIXME) |
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56 | |||
57 | (2) The code in this file is compiled twice, once in 32-bit mode and |
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58 | once in 64-bit mode. More of it should be made size-independent |
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59 | and moved into elf.c. |
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60 | |||
61 | (3) ELF section symbols are handled rather sloppily now. This should |
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62 | be cleaned up, and ELF section symbols reconciled with BFD section |
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63 | symbols. |
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64 | |||
65 | (4) We need a published spec for 64-bit ELF. We've got some stuff here |
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66 | that we're using for SPARC V9 64-bit chips, but don't assume that |
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67 | it's cast in stone. |
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68 | */ |
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69 | |||
70 | #include "sysdep.h" |
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71 | #include "bfd.h" |
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72 | #include "libiberty.h" |
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73 | #include "bfdlink.h" |
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74 | #include "libbfd.h" |
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75 | #include "elf-bfd.h" |
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76 | |||
77 | /* Renaming structures, typedefs, macros and functions to be size-specific. */ |
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78 | #define Elf_External_Ehdr NAME(Elf,External_Ehdr) |
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79 | #define Elf_External_Sym NAME(Elf,External_Sym) |
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80 | #define Elf_External_Shdr NAME(Elf,External_Shdr) |
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81 | #define Elf_External_Phdr NAME(Elf,External_Phdr) |
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82 | #define Elf_External_Rel NAME(Elf,External_Rel) |
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83 | #define Elf_External_Rela NAME(Elf,External_Rela) |
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84 | #define Elf_External_Dyn NAME(Elf,External_Dyn) |
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85 | |||
86 | #define elf_core_file_failing_command NAME(bfd_elf,core_file_failing_command) |
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87 | #define elf_core_file_failing_signal NAME(bfd_elf,core_file_failing_signal) |
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88 | #define elf_core_file_matches_executable_p \ |
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89 | NAME(bfd_elf,core_file_matches_executable_p) |
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90 | #define elf_core_file_pid NAME(bfd_elf,core_file_pid) |
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91 | #define elf_object_p NAME(bfd_elf,object_p) |
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92 | #define elf_core_file_p NAME(bfd_elf,core_file_p) |
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93 | #define elf_get_symtab_upper_bound NAME(bfd_elf,get_symtab_upper_bound) |
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94 | #define elf_get_dynamic_symtab_upper_bound \ |
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95 | NAME(bfd_elf,get_dynamic_symtab_upper_bound) |
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96 | #define elf_swap_reloc_in NAME(bfd_elf,swap_reloc_in) |
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97 | #define elf_swap_reloca_in NAME(bfd_elf,swap_reloca_in) |
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98 | #define elf_swap_reloc_out NAME(bfd_elf,swap_reloc_out) |
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99 | #define elf_swap_reloca_out NAME(bfd_elf,swap_reloca_out) |
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100 | #define elf_swap_symbol_in NAME(bfd_elf,swap_symbol_in) |
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101 | #define elf_swap_symbol_out NAME(bfd_elf,swap_symbol_out) |
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102 | #define elf_swap_phdr_in NAME(bfd_elf,swap_phdr_in) |
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103 | #define elf_swap_phdr_out NAME(bfd_elf,swap_phdr_out) |
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104 | #define elf_swap_dyn_in NAME(bfd_elf,swap_dyn_in) |
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105 | #define elf_swap_dyn_out NAME(bfd_elf,swap_dyn_out) |
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106 | #define elf_get_reloc_upper_bound NAME(bfd_elf,get_reloc_upper_bound) |
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107 | #define elf_canonicalize_reloc NAME(bfd_elf,canonicalize_reloc) |
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108 | #define elf_slurp_symbol_table NAME(bfd_elf,slurp_symbol_table) |
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109 | #define elf_canonicalize_symtab NAME(bfd_elf,canonicalize_symtab) |
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110 | #define elf_canonicalize_dynamic_symtab \ |
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111 | NAME(bfd_elf,canonicalize_dynamic_symtab) |
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112 | #define elf_get_synthetic_symtab \ |
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113 | NAME(bfd_elf,get_synthetic_symtab) |
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114 | #define elf_make_empty_symbol NAME(bfd_elf,make_empty_symbol) |
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115 | #define elf_get_symbol_info NAME(bfd_elf,get_symbol_info) |
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116 | #define elf_get_lineno NAME(bfd_elf,get_lineno) |
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117 | #define elf_set_arch_mach NAME(bfd_elf,set_arch_mach) |
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118 | #define elf_find_nearest_line NAME(bfd_elf,find_nearest_line) |
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119 | #define elf_sizeof_headers NAME(bfd_elf,sizeof_headers) |
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120 | #define elf_set_section_contents NAME(bfd_elf,set_section_contents) |
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121 | #define elf_no_info_to_howto NAME(bfd_elf,no_info_to_howto) |
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122 | #define elf_no_info_to_howto_rel NAME(bfd_elf,no_info_to_howto_rel) |
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123 | #define elf_find_section NAME(bfd_elf,find_section) |
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124 | #define elf_write_shdrs_and_ehdr NAME(bfd_elf,write_shdrs_and_ehdr) |
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125 | #define elf_write_out_phdrs NAME(bfd_elf,write_out_phdrs) |
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126 | #define elf_checksum_contents NAME(bfd_elf,checksum_contents) |
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127 | #define elf_write_relocs NAME(bfd_elf,write_relocs) |
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128 | #define elf_slurp_reloc_table NAME(bfd_elf,slurp_reloc_table) |
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129 | |||
130 | #if ARCH_SIZE == 64 |
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131 | #define ELF_R_INFO(X,Y) ELF64_R_INFO(X,Y) |
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132 | #define ELF_R_SYM(X) ELF64_R_SYM(X) |
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133 | #define ELF_R_TYPE(X) ELF64_R_TYPE(X) |
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134 | #define ELFCLASS ELFCLASS64 |
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135 | #define FILE_ALIGN 8 |
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136 | #define LOG_FILE_ALIGN 3 |
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137 | #endif |
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138 | #if ARCH_SIZE == 32 |
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139 | #define ELF_R_INFO(X,Y) ELF32_R_INFO(X,Y) |
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140 | #define ELF_R_SYM(X) ELF32_R_SYM(X) |
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141 | #define ELF_R_TYPE(X) ELF32_R_TYPE(X) |
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142 | #define ELFCLASS ELFCLASS32 |
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143 | #define FILE_ALIGN 4 |
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144 | #define LOG_FILE_ALIGN 2 |
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145 | #endif |
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146 | |||
147 | #if DEBUG & 2 |
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148 | static void elf_debug_section (int, Elf_Internal_Shdr *); |
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149 | #endif |
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150 | #if DEBUG & 1 |
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151 | static void elf_debug_file (Elf_Internal_Ehdr *); |
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152 | #endif |
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153 | |||
154 | /* Structure swapping routines */ |
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155 | |||
156 | /* Should perhaps use put_offset, put_word, etc. For now, the two versions |
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157 | can be handled by explicitly specifying 32 bits or "the long type". */ |
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158 | #if ARCH_SIZE == 64 |
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159 | #define H_PUT_WORD H_PUT_64 |
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160 | #define H_PUT_SIGNED_WORD H_PUT_S64 |
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161 | #define H_GET_WORD H_GET_64 |
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162 | #define H_GET_SIGNED_WORD H_GET_S64 |
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163 | #endif |
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164 | #if ARCH_SIZE == 32 |
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165 | #define H_PUT_WORD H_PUT_32 |
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166 | #define H_PUT_SIGNED_WORD H_PUT_S32 |
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167 | #define H_GET_WORD H_GET_32 |
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168 | #define H_GET_SIGNED_WORD H_GET_S32 |
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169 | #endif |
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170 | |||
171 | /* Translate an ELF symbol in external format into an ELF symbol in internal |
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172 | format. */ |
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173 | |||
174 | bfd_boolean |
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175 | elf_swap_symbol_in (bfd *abfd, |
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176 | const void *psrc, |
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177 | const void *pshn, |
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178 | Elf_Internal_Sym *dst) |
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179 | { |
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180 | const Elf_External_Sym *src = (const Elf_External_Sym *) psrc; |
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181 | const Elf_External_Sym_Shndx *shndx = (const Elf_External_Sym_Shndx *) pshn; |
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182 | int signed_vma = get_elf_backend_data (abfd)->sign_extend_vma; |
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183 | |||
184 | dst->st_name = H_GET_32 (abfd, src->st_name); |
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185 | if (signed_vma) |
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186 | dst->st_value = H_GET_SIGNED_WORD (abfd, src->st_value); |
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187 | else |
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188 | dst->st_value = H_GET_WORD (abfd, src->st_value); |
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189 | dst->st_size = H_GET_WORD (abfd, src->st_size); |
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190 | dst->st_info = H_GET_8 (abfd, src->st_info); |
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191 | dst->st_other = H_GET_8 (abfd, src->st_other); |
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192 | dst->st_shndx = H_GET_16 (abfd, src->st_shndx); |
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193 | if (dst->st_shndx == (SHN_XINDEX & 0xffff)) |
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194 | { |
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195 | if (shndx == NULL) |
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196 | return FALSE; |
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197 | dst->st_shndx = H_GET_32 (abfd, shndx->est_shndx); |
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198 | } |
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199 | else if (dst->st_shndx >= (SHN_LORESERVE & 0xffff)) |
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200 | dst->st_shndx += SHN_LORESERVE - (SHN_LORESERVE & 0xffff); |
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201 | dst->st_target_internal = 0; |
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202 | return TRUE; |
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203 | } |
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204 | |||
205 | /* Translate an ELF symbol in internal format into an ELF symbol in external |
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206 | format. */ |
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207 | |||
208 | void |
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209 | elf_swap_symbol_out (bfd *abfd, |
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210 | const Elf_Internal_Sym *src, |
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211 | void *cdst, |
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212 | void *shndx) |
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213 | { |
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214 | unsigned int tmp; |
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215 | Elf_External_Sym *dst = (Elf_External_Sym *) cdst; |
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216 | H_PUT_32 (abfd, src->st_name, dst->st_name); |
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217 | H_PUT_WORD (abfd, src->st_value, dst->st_value); |
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218 | H_PUT_WORD (abfd, src->st_size, dst->st_size); |
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219 | H_PUT_8 (abfd, src->st_info, dst->st_info); |
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220 | H_PUT_8 (abfd, src->st_other, dst->st_other); |
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221 | tmp = src->st_shndx; |
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222 | if (tmp >= (SHN_LORESERVE & 0xffff) && tmp < SHN_LORESERVE) |
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223 | { |
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224 | if (shndx == NULL) |
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225 | abort (); |
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226 | H_PUT_32 (abfd, tmp, shndx); |
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227 | tmp = SHN_XINDEX & 0xffff; |
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228 | } |
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229 | H_PUT_16 (abfd, tmp, dst->st_shndx); |
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230 | } |
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231 | |||
232 | /* Translate an ELF file header in external format into an ELF file header in |
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233 | internal format. */ |
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234 | |||
235 | static void |
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236 | elf_swap_ehdr_in (bfd *abfd, |
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237 | const Elf_External_Ehdr *src, |
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238 | Elf_Internal_Ehdr *dst) |
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239 | { |
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240 | int signed_vma = get_elf_backend_data (abfd)->sign_extend_vma; |
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241 | memcpy (dst->e_ident, src->e_ident, EI_NIDENT); |
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242 | dst->e_type = H_GET_16 (abfd, src->e_type); |
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243 | dst->e_machine = H_GET_16 (abfd, src->e_machine); |
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244 | dst->e_version = H_GET_32 (abfd, src->e_version); |
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245 | if (signed_vma) |
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246 | dst->e_entry = H_GET_SIGNED_WORD (abfd, src->e_entry); |
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247 | else |
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248 | dst->e_entry = H_GET_WORD (abfd, src->e_entry); |
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249 | dst->e_phoff = H_GET_WORD (abfd, src->e_phoff); |
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250 | dst->e_shoff = H_GET_WORD (abfd, src->e_shoff); |
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251 | dst->e_flags = H_GET_32 (abfd, src->e_flags); |
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252 | dst->e_ehsize = H_GET_16 (abfd, src->e_ehsize); |
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253 | dst->e_phentsize = H_GET_16 (abfd, src->e_phentsize); |
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254 | dst->e_phnum = H_GET_16 (abfd, src->e_phnum); |
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255 | dst->e_shentsize = H_GET_16 (abfd, src->e_shentsize); |
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256 | dst->e_shnum = H_GET_16 (abfd, src->e_shnum); |
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257 | dst->e_shstrndx = H_GET_16 (abfd, src->e_shstrndx); |
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258 | } |
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259 | |||
260 | /* Translate an ELF file header in internal format into an ELF file header in |
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261 | external format. */ |
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262 | |||
263 | static void |
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264 | elf_swap_ehdr_out (bfd *abfd, |
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265 | const Elf_Internal_Ehdr *src, |
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266 | Elf_External_Ehdr *dst) |
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267 | { |
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268 | unsigned int tmp; |
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269 | int signed_vma = get_elf_backend_data (abfd)->sign_extend_vma; |
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270 | memcpy (dst->e_ident, src->e_ident, EI_NIDENT); |
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271 | /* note that all elements of dst are *arrays of unsigned char* already... */ |
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272 | H_PUT_16 (abfd, src->e_type, dst->e_type); |
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273 | H_PUT_16 (abfd, src->e_machine, dst->e_machine); |
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274 | H_PUT_32 (abfd, src->e_version, dst->e_version); |
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275 | if (signed_vma) |
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276 | H_PUT_SIGNED_WORD (abfd, src->e_entry, dst->e_entry); |
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277 | else |
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278 | H_PUT_WORD (abfd, src->e_entry, dst->e_entry); |
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279 | H_PUT_WORD (abfd, src->e_phoff, dst->e_phoff); |
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280 | H_PUT_WORD (abfd, src->e_shoff, dst->e_shoff); |
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281 | H_PUT_32 (abfd, src->e_flags, dst->e_flags); |
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282 | H_PUT_16 (abfd, src->e_ehsize, dst->e_ehsize); |
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283 | H_PUT_16 (abfd, src->e_phentsize, dst->e_phentsize); |
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284 | tmp = src->e_phnum; |
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285 | if (tmp > PN_XNUM) |
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286 | tmp = PN_XNUM; |
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287 | H_PUT_16 (abfd, tmp, dst->e_phnum); |
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288 | H_PUT_16 (abfd, src->e_shentsize, dst->e_shentsize); |
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289 | tmp = src->e_shnum; |
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290 | if (tmp >= (SHN_LORESERVE & 0xffff)) |
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291 | tmp = SHN_UNDEF; |
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292 | H_PUT_16 (abfd, tmp, dst->e_shnum); |
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293 | tmp = src->e_shstrndx; |
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294 | if (tmp >= (SHN_LORESERVE & 0xffff)) |
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295 | tmp = SHN_XINDEX & 0xffff; |
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296 | H_PUT_16 (abfd, tmp, dst->e_shstrndx); |
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297 | } |
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298 | |||
299 | /* Translate an ELF section header table entry in external format into an |
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300 | ELF section header table entry in internal format. */ |
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301 | |||
302 | static void |
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303 | elf_swap_shdr_in (bfd *abfd, |
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304 | const Elf_External_Shdr *src, |
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305 | Elf_Internal_Shdr *dst) |
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306 | { |
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307 | int signed_vma = get_elf_backend_data (abfd)->sign_extend_vma; |
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308 | |||
309 | dst->sh_name = H_GET_32 (abfd, src->sh_name); |
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310 | dst->sh_type = H_GET_32 (abfd, src->sh_type); |
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311 | dst->sh_flags = H_GET_WORD (abfd, src->sh_flags); |
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312 | if (signed_vma) |
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313 | dst->sh_addr = H_GET_SIGNED_WORD (abfd, src->sh_addr); |
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314 | else |
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315 | dst->sh_addr = H_GET_WORD (abfd, src->sh_addr); |
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316 | dst->sh_offset = H_GET_WORD (abfd, src->sh_offset); |
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317 | dst->sh_size = H_GET_WORD (abfd, src->sh_size); |
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318 | dst->sh_link = H_GET_32 (abfd, src->sh_link); |
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319 | dst->sh_info = H_GET_32 (abfd, src->sh_info); |
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320 | dst->sh_addralign = H_GET_WORD (abfd, src->sh_addralign); |
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321 | dst->sh_entsize = H_GET_WORD (abfd, src->sh_entsize); |
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322 | dst->bfd_section = NULL; |
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323 | dst->contents = NULL; |
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324 | } |
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325 | |||
326 | /* Translate an ELF section header table entry in internal format into an |
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327 | ELF section header table entry in external format. */ |
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328 | |||
329 | static void |
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330 | elf_swap_shdr_out (bfd *abfd, |
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331 | const Elf_Internal_Shdr *src, |
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332 | Elf_External_Shdr *dst) |
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333 | { |
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334 | /* note that all elements of dst are *arrays of unsigned char* already... */ |
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335 | H_PUT_32 (abfd, src->sh_name, dst->sh_name); |
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336 | H_PUT_32 (abfd, src->sh_type, dst->sh_type); |
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337 | H_PUT_WORD (abfd, src->sh_flags, dst->sh_flags); |
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338 | H_PUT_WORD (abfd, src->sh_addr, dst->sh_addr); |
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339 | H_PUT_WORD (abfd, src->sh_offset, dst->sh_offset); |
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340 | H_PUT_WORD (abfd, src->sh_size, dst->sh_size); |
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341 | H_PUT_32 (abfd, src->sh_link, dst->sh_link); |
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342 | H_PUT_32 (abfd, src->sh_info, dst->sh_info); |
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343 | H_PUT_WORD (abfd, src->sh_addralign, dst->sh_addralign); |
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344 | H_PUT_WORD (abfd, src->sh_entsize, dst->sh_entsize); |
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345 | } |
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346 | |||
347 | /* Translate an ELF program header table entry in external format into an |
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348 | ELF program header table entry in internal format. */ |
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349 | |||
350 | void |
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351 | elf_swap_phdr_in (bfd *abfd, |
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352 | const Elf_External_Phdr *src, |
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353 | Elf_Internal_Phdr *dst) |
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354 | { |
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355 | int signed_vma = get_elf_backend_data (abfd)->sign_extend_vma; |
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356 | |||
357 | dst->p_type = H_GET_32 (abfd, src->p_type); |
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358 | dst->p_flags = H_GET_32 (abfd, src->p_flags); |
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359 | dst->p_offset = H_GET_WORD (abfd, src->p_offset); |
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360 | if (signed_vma) |
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361 | { |
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362 | dst->p_vaddr = H_GET_SIGNED_WORD (abfd, src->p_vaddr); |
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363 | dst->p_paddr = H_GET_SIGNED_WORD (abfd, src->p_paddr); |
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364 | } |
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365 | else |
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366 | { |
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367 | dst->p_vaddr = H_GET_WORD (abfd, src->p_vaddr); |
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368 | dst->p_paddr = H_GET_WORD (abfd, src->p_paddr); |
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369 | } |
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370 | dst->p_filesz = H_GET_WORD (abfd, src->p_filesz); |
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371 | dst->p_memsz = H_GET_WORD (abfd, src->p_memsz); |
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372 | dst->p_align = H_GET_WORD (abfd, src->p_align); |
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373 | } |
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374 | |||
375 | void |
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376 | elf_swap_phdr_out (bfd *abfd, |
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377 | const Elf_Internal_Phdr *src, |
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378 | Elf_External_Phdr *dst) |
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379 | { |
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380 | const struct elf_backend_data *bed; |
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381 | bfd_vma p_paddr; |
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382 | |||
383 | bed = get_elf_backend_data (abfd); |
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384 | p_paddr = bed->want_p_paddr_set_to_zero ? 0 : src->p_paddr; |
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385 | |||
386 | /* note that all elements of dst are *arrays of unsigned char* already... */ |
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387 | H_PUT_32 (abfd, src->p_type, dst->p_type); |
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388 | H_PUT_WORD (abfd, src->p_offset, dst->p_offset); |
||
389 | H_PUT_WORD (abfd, src->p_vaddr, dst->p_vaddr); |
||
390 | H_PUT_WORD (abfd, p_paddr, dst->p_paddr); |
||
391 | H_PUT_WORD (abfd, src->p_filesz, dst->p_filesz); |
||
392 | H_PUT_WORD (abfd, src->p_memsz, dst->p_memsz); |
||
393 | H_PUT_32 (abfd, src->p_flags, dst->p_flags); |
||
394 | H_PUT_WORD (abfd, src->p_align, dst->p_align); |
||
395 | } |
||
396 | |||
397 | /* Translate an ELF reloc from external format to internal format. */ |
||
398 | void |
||
399 | elf_swap_reloc_in (bfd *abfd, |
||
400 | const bfd_byte *s, |
||
401 | Elf_Internal_Rela *dst) |
||
402 | { |
||
403 | const Elf_External_Rel *src = (const Elf_External_Rel *) s; |
||
404 | dst->r_offset = H_GET_WORD (abfd, src->r_offset); |
||
405 | dst->r_info = H_GET_WORD (abfd, src->r_info); |
||
406 | dst->r_addend = 0; |
||
407 | } |
||
408 | |||
409 | void |
||
410 | elf_swap_reloca_in (bfd *abfd, |
||
411 | const bfd_byte *s, |
||
412 | Elf_Internal_Rela *dst) |
||
413 | { |
||
414 | const Elf_External_Rela *src = (const Elf_External_Rela *) s; |
||
415 | dst->r_offset = H_GET_WORD (abfd, src->r_offset); |
||
416 | dst->r_info = H_GET_WORD (abfd, src->r_info); |
||
417 | dst->r_addend = H_GET_SIGNED_WORD (abfd, src->r_addend); |
||
418 | } |
||
419 | |||
420 | /* Translate an ELF reloc from internal format to external format. */ |
||
421 | void |
||
422 | elf_swap_reloc_out (bfd *abfd, |
||
423 | const Elf_Internal_Rela *src, |
||
424 | bfd_byte *d) |
||
425 | { |
||
426 | Elf_External_Rel *dst = (Elf_External_Rel *) d; |
||
427 | H_PUT_WORD (abfd, src->r_offset, dst->r_offset); |
||
428 | H_PUT_WORD (abfd, src->r_info, dst->r_info); |
||
429 | } |
||
430 | |||
431 | void |
||
432 | elf_swap_reloca_out (bfd *abfd, |
||
433 | const Elf_Internal_Rela *src, |
||
434 | bfd_byte *d) |
||
435 | { |
||
436 | Elf_External_Rela *dst = (Elf_External_Rela *) d; |
||
437 | H_PUT_WORD (abfd, src->r_offset, dst->r_offset); |
||
438 | H_PUT_WORD (abfd, src->r_info, dst->r_info); |
||
439 | H_PUT_SIGNED_WORD (abfd, src->r_addend, dst->r_addend); |
||
440 | } |
||
441 | |||
442 | void |
||
443 | elf_swap_dyn_in (bfd *abfd, |
||
444 | const void *p, |
||
445 | Elf_Internal_Dyn *dst) |
||
446 | { |
||
447 | const Elf_External_Dyn *src = (const Elf_External_Dyn *) p; |
||
448 | |||
449 | dst->d_tag = H_GET_WORD (abfd, src->d_tag); |
||
450 | dst->d_un.d_val = H_GET_WORD (abfd, src->d_un.d_val); |
||
451 | } |
||
452 | |||
453 | void |
||
454 | elf_swap_dyn_out (bfd *abfd, |
||
455 | const Elf_Internal_Dyn *src, |
||
456 | void *p) |
||
457 | { |
||
458 | Elf_External_Dyn *dst = (Elf_External_Dyn *) p; |
||
459 | |||
460 | H_PUT_WORD (abfd, src->d_tag, dst->d_tag); |
||
461 | H_PUT_WORD (abfd, src->d_un.d_val, dst->d_un.d_val); |
||
462 | } |
||
463 | |||
464 | /* ELF .o/exec file reading */ |
||
465 | |||
466 | /* Begin processing a given object. |
||
467 | |||
468 | First we validate the file by reading in the ELF header and checking |
||
469 | the magic number. */ |
||
470 | |||
471 | static inline bfd_boolean |
||
472 | elf_file_p (Elf_External_Ehdr *x_ehdrp) |
||
473 | { |
||
474 | return ((x_ehdrp->e_ident[EI_MAG0] == ELFMAG0) |
||
475 | && (x_ehdrp->e_ident[EI_MAG1] == ELFMAG1) |
||
476 | && (x_ehdrp->e_ident[EI_MAG2] == ELFMAG2) |
||
477 | && (x_ehdrp->e_ident[EI_MAG3] == ELFMAG3)); |
||
478 | } |
||
479 | |||
480 | /* Check to see if the file associated with ABFD matches the target vector |
||
481 | that ABFD points to. |
||
482 | |||
483 | Note that we may be called several times with the same ABFD, but different |
||
484 | target vectors, most of which will not match. We have to avoid leaving |
||
485 | any side effects in ABFD, or any data it points to (like tdata), if the |
||
486 | file does not match the target vector. */ |
||
487 | |||
488 | const bfd_target * |
||
489 | elf_object_p (bfd *abfd) |
||
490 | { |
||
491 | Elf_External_Ehdr x_ehdr; /* Elf file header, external form */ |
||
492 | Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form */ |
||
493 | Elf_External_Shdr x_shdr; /* Section header table entry, external form */ |
||
494 | Elf_Internal_Shdr i_shdr; |
||
495 | Elf_Internal_Shdr *i_shdrp; /* Section header table, internal form */ |
||
496 | unsigned int shindex; |
||
497 | const struct elf_backend_data *ebd; |
||
498 | asection *s; |
||
499 | bfd_size_type amt; |
||
500 | const bfd_target *target; |
||
501 | |||
502 | /* Read in the ELF header in external format. */ |
||
503 | |||
504 | if (bfd_bread (&x_ehdr, sizeof (x_ehdr), abfd) != sizeof (x_ehdr)) |
||
505 | { |
||
506 | if (bfd_get_error () != bfd_error_system_call) |
||
507 | goto got_wrong_format_error; |
||
508 | else |
||
509 | goto got_no_match; |
||
510 | } |
||
511 | |||
512 | /* Now check to see if we have a valid ELF file, and one that BFD can |
||
513 | make use of. The magic number must match, the address size ('class') |
||
514 | and byte-swapping must match our XVEC entry, and it must have a |
||
515 | section header table (FIXME: See comments re sections at top of this |
||
516 | file). */ |
||
517 | |||
518 | if (! elf_file_p (&x_ehdr) |
||
519 | || x_ehdr.e_ident[EI_VERSION] != EV_CURRENT |
||
520 | || x_ehdr.e_ident[EI_CLASS] != ELFCLASS) |
||
521 | goto got_wrong_format_error; |
||
522 | |||
523 | /* Check that file's byte order matches xvec's */ |
||
524 | switch (x_ehdr.e_ident[EI_DATA]) |
||
525 | { |
||
526 | case ELFDATA2MSB: /* Big-endian */ |
||
527 | if (! bfd_header_big_endian (abfd)) |
||
528 | goto got_wrong_format_error; |
||
529 | break; |
||
530 | case ELFDATA2LSB: /* Little-endian */ |
||
531 | if (! bfd_header_little_endian (abfd)) |
||
532 | goto got_wrong_format_error; |
||
533 | break; |
||
534 | case ELFDATANONE: /* No data encoding specified */ |
||
535 | default: /* Unknown data encoding specified */ |
||
536 | goto got_wrong_format_error; |
||
537 | } |
||
538 | |||
539 | target = abfd->xvec; |
||
540 | |||
541 | /* Allocate an instance of the elf_obj_tdata structure and hook it up to |
||
542 | the tdata pointer in the bfd. */ |
||
543 | |||
544 | if (! (*target->_bfd_set_format[bfd_object]) (abfd)) |
||
545 | goto got_no_match; |
||
546 | |||
547 | /* Now that we know the byte order, swap in the rest of the header */ |
||
548 | i_ehdrp = elf_elfheader (abfd); |
||
549 | elf_swap_ehdr_in (abfd, &x_ehdr, i_ehdrp); |
||
550 | #if DEBUG & 1 |
||
551 | elf_debug_file (i_ehdrp); |
||
552 | #endif |
||
553 | |||
554 | /* Reject ET_CORE (header indicates core file, not object file) */ |
||
555 | if (i_ehdrp->e_type == ET_CORE) |
||
556 | goto got_wrong_format_error; |
||
557 | |||
558 | /* If this is a relocatable file and there is no section header |
||
559 | table, then we're hosed. */ |
||
560 | if (i_ehdrp->e_shoff == 0 && i_ehdrp->e_type == ET_REL) |
||
561 | goto got_wrong_format_error; |
||
562 | |||
563 | /* As a simple sanity check, verify that what BFD thinks is the |
||
564 | size of each section header table entry actually matches the size |
||
565 | recorded in the file, but only if there are any sections. */ |
||
566 | if (i_ehdrp->e_shentsize != sizeof (x_shdr) && i_ehdrp->e_shnum != 0) |
||
567 | goto got_wrong_format_error; |
||
568 | |||
569 | /* Further sanity check. */ |
||
570 | if (i_ehdrp->e_shoff == 0 && i_ehdrp->e_shnum != 0) |
||
571 | goto got_wrong_format_error; |
||
572 | |||
573 | ebd = get_elf_backend_data (abfd); |
||
574 | if (ebd->s->arch_size != ARCH_SIZE) |
||
575 | goto got_wrong_format_error; |
||
576 | |||
577 | /* Check that the ELF e_machine field matches what this particular |
||
578 | BFD format expects. */ |
||
579 | if (ebd->elf_machine_code != i_ehdrp->e_machine |
||
580 | && (ebd->elf_machine_alt1 == 0 |
||
581 | || i_ehdrp->e_machine != ebd->elf_machine_alt1) |
||
582 | && (ebd->elf_machine_alt2 == 0 |
||
583 | || i_ehdrp->e_machine != ebd->elf_machine_alt2) |
||
584 | && ebd->elf_machine_code != EM_NONE) |
||
585 | goto got_wrong_format_error; |
||
586 | |||
587 | if (i_ehdrp->e_type == ET_EXEC) |
||
588 | abfd->flags |= EXEC_P; |
||
589 | else if (i_ehdrp->e_type == ET_DYN) |
||
590 | abfd->flags |= DYNAMIC; |
||
591 | |||
592 | if (i_ehdrp->e_phnum > 0) |
||
593 | abfd->flags |= D_PAGED; |
||
594 | |||
595 | if (! bfd_default_set_arch_mach (abfd, ebd->arch, 0)) |
||
596 | { |
||
597 | /* It's OK if this fails for the generic target. */ |
||
598 | if (ebd->elf_machine_code != EM_NONE) |
||
599 | goto got_no_match; |
||
600 | } |
||
601 | |||
602 | if (ebd->elf_machine_code != EM_NONE |
||
603 | && i_ehdrp->e_ident[EI_OSABI] != ebd->elf_osabi |
||
604 | && ebd->elf_osabi != ELFOSABI_NONE) |
||
605 | goto got_wrong_format_error; |
||
606 | |||
607 | if (i_ehdrp->e_shoff != 0) |
||
608 | { |
||
609 | bfd_signed_vma where = i_ehdrp->e_shoff; |
||
610 | |||
611 | if (where != (file_ptr) where) |
||
612 | goto got_wrong_format_error; |
||
613 | |||
614 | /* Seek to the section header table in the file. */ |
||
615 | if (bfd_seek (abfd, (file_ptr) where, SEEK_SET) != 0) |
||
616 | goto got_no_match; |
||
617 | |||
618 | /* Read the first section header at index 0, and convert to internal |
||
619 | form. */ |
||
620 | if (bfd_bread (&x_shdr, sizeof x_shdr, abfd) != sizeof (x_shdr)) |
||
621 | goto got_no_match; |
||
622 | elf_swap_shdr_in (abfd, &x_shdr, &i_shdr); |
||
623 | |||
624 | /* If the section count is zero, the actual count is in the first |
||
625 | section header. */ |
||
626 | if (i_ehdrp->e_shnum == SHN_UNDEF) |
||
627 | { |
||
628 | i_ehdrp->e_shnum = i_shdr.sh_size; |
||
629 | if (i_ehdrp->e_shnum >= SHN_LORESERVE |
||
630 | || i_ehdrp->e_shnum != i_shdr.sh_size |
||
631 | || i_ehdrp->e_shnum == 0) |
||
632 | goto got_wrong_format_error; |
||
633 | } |
||
634 | |||
635 | /* And similarly for the string table index. */ |
||
636 | if (i_ehdrp->e_shstrndx == (SHN_XINDEX & 0xffff)) |
||
637 | { |
||
638 | i_ehdrp->e_shstrndx = i_shdr.sh_link; |
||
639 | if (i_ehdrp->e_shstrndx != i_shdr.sh_link) |
||
640 | goto got_wrong_format_error; |
||
641 | } |
||
642 | |||
643 | /* And program headers. */ |
||
644 | if (i_ehdrp->e_phnum == PN_XNUM && i_shdr.sh_info != 0) |
||
645 | { |
||
646 | i_ehdrp->e_phnum = i_shdr.sh_info; |
||
647 | if (i_ehdrp->e_phnum != i_shdr.sh_info) |
||
648 | goto got_wrong_format_error; |
||
649 | } |
||
650 | |||
651 | /* Sanity check that we can read all of the section headers. |
||
652 | It ought to be good enough to just read the last one. */ |
||
653 | if (i_ehdrp->e_shnum != 1) |
||
654 | { |
||
655 | /* Check that we don't have a totally silly number of sections. */ |
||
656 | if (i_ehdrp->e_shnum > (unsigned int) -1 / sizeof (x_shdr) |
||
657 | || i_ehdrp->e_shnum > (unsigned int) -1 / sizeof (i_shdr)) |
||
658 | goto got_wrong_format_error; |
||
659 | |||
660 | where += (i_ehdrp->e_shnum - 1) * sizeof (x_shdr); |
||
661 | if (where != (file_ptr) where) |
||
662 | goto got_wrong_format_error; |
||
663 | if ((bfd_size_type) where <= i_ehdrp->e_shoff) |
||
664 | goto got_wrong_format_error; |
||
665 | |||
666 | if (bfd_seek (abfd, (file_ptr) where, SEEK_SET) != 0) |
||
667 | goto got_no_match; |
||
668 | if (bfd_bread (&x_shdr, sizeof x_shdr, abfd) != sizeof (x_shdr)) |
||
669 | goto got_no_match; |
||
670 | |||
671 | /* Back to where we were. */ |
||
672 | where = i_ehdrp->e_shoff + sizeof (x_shdr); |
||
673 | if (bfd_seek (abfd, (file_ptr) where, SEEK_SET) != 0) |
||
674 | goto got_no_match; |
||
675 | } |
||
676 | } |
||
677 | |||
678 | /* Allocate space for a copy of the section header table in |
||
679 | internal form. */ |
||
680 | if (i_ehdrp->e_shnum != 0) |
||
681 | { |
||
682 | Elf_Internal_Shdr *shdrp; |
||
683 | unsigned int num_sec; |
||
684 | |||
685 | amt = sizeof (*i_shdrp) * i_ehdrp->e_shnum; |
||
686 | i_shdrp = (Elf_Internal_Shdr *) bfd_alloc (abfd, amt); |
||
687 | if (!i_shdrp) |
||
688 | goto got_no_match; |
||
689 | num_sec = i_ehdrp->e_shnum; |
||
690 | elf_numsections (abfd) = num_sec; |
||
691 | amt = sizeof (i_shdrp) * num_sec; |
||
692 | elf_elfsections (abfd) = (Elf_Internal_Shdr **) bfd_alloc (abfd, amt); |
||
693 | if (!elf_elfsections (abfd)) |
||
694 | goto got_no_match; |
||
695 | |||
696 | memcpy (i_shdrp, &i_shdr, sizeof (*i_shdrp)); |
||
697 | for (shdrp = i_shdrp, shindex = 0; shindex < num_sec; shindex++) |
||
698 | elf_elfsections (abfd)[shindex] = shdrp++; |
||
699 | |||
700 | /* Read in the rest of the section header table and convert it |
||
701 | to internal form. */ |
||
702 | for (shindex = 1; shindex < i_ehdrp->e_shnum; shindex++) |
||
703 | { |
||
704 | if (bfd_bread (&x_shdr, sizeof x_shdr, abfd) != sizeof (x_shdr)) |
||
705 | goto got_no_match; |
||
706 | elf_swap_shdr_in (abfd, &x_shdr, i_shdrp + shindex); |
||
707 | |||
708 | /* Sanity check sh_link and sh_info. */ |
||
709 | if (i_shdrp[shindex].sh_link >= num_sec) |
||
710 | { |
||
711 | /* PR 10478: Accept Solaris binaries with a sh_link |
||
712 | field set to SHN_BEFORE or SHN_AFTER. */ |
||
713 | switch (ebd->elf_machine_code) |
||
714 | { |
||
715 | case EM_386: |
||
716 | case EM_486: |
||
717 | case EM_X86_64: |
||
718 | case EM_OLD_SPARCV9: |
||
719 | case EM_SPARC32PLUS: |
||
720 | case EM_SPARCV9: |
||
721 | case EM_SPARC: |
||
722 | if (i_shdrp[shindex].sh_link == (SHN_LORESERVE & 0xffff) /* SHN_BEFORE */ |
||
723 | || i_shdrp[shindex].sh_link == ((SHN_LORESERVE + 1) & 0xffff) /* SHN_AFTER */) |
||
724 | break; |
||
725 | /* Otherwise fall through. */ |
||
726 | default: |
||
727 | goto got_wrong_format_error; |
||
728 | } |
||
729 | } |
||
730 | |||
731 | if (((i_shdrp[shindex].sh_flags & SHF_INFO_LINK) |
||
732 | || i_shdrp[shindex].sh_type == SHT_RELA |
||
733 | || i_shdrp[shindex].sh_type == SHT_REL) |
||
734 | && i_shdrp[shindex].sh_info >= num_sec) |
||
735 | goto got_wrong_format_error; |
||
736 | |||
737 | /* If the section is loaded, but not page aligned, clear |
||
738 | D_PAGED. */ |
||
739 | if (i_shdrp[shindex].sh_size != 0 |
||
740 | && (i_shdrp[shindex].sh_flags & SHF_ALLOC) != 0 |
||
741 | && i_shdrp[shindex].sh_type != SHT_NOBITS |
||
742 | && (((i_shdrp[shindex].sh_addr - i_shdrp[shindex].sh_offset) |
||
743 | % ebd->minpagesize) |
||
744 | != 0)) |
||
745 | abfd->flags &= ~D_PAGED; |
||
746 | } |
||
747 | } |
||
748 | |||
749 | /* A further sanity check. */ |
||
750 | if (i_ehdrp->e_shnum != 0) |
||
751 | { |
||
752 | if (i_ehdrp->e_shstrndx >= elf_numsections (abfd)) |
||
753 | { |
||
754 | /* PR 2257: |
||
755 | We used to just goto got_wrong_format_error here |
||
756 | but there are binaries in existance for which this test |
||
757 | will prevent the binutils from working with them at all. |
||
758 | So we are kind, and reset the string index value to 0 |
||
759 | so that at least some processing can be done. */ |
||
760 | i_ehdrp->e_shstrndx = SHN_UNDEF; |
||
761 | _bfd_error_handler (_("warning: %s has a corrupt string table index - ignoring"), abfd->filename); |
||
762 | } |
||
763 | } |
||
764 | else if (i_ehdrp->e_shstrndx != SHN_UNDEF) |
||
765 | goto got_wrong_format_error; |
||
766 | |||
767 | /* Read in the program headers. */ |
||
768 | if (i_ehdrp->e_phnum == 0) |
||
769 | elf_tdata (abfd)->phdr = NULL; |
||
770 | else |
||
771 | { |
||
772 | Elf_Internal_Phdr *i_phdr; |
||
773 | unsigned int i; |
||
774 | |||
775 | amt = i_ehdrp->e_phnum * sizeof (Elf_Internal_Phdr); |
||
776 | elf_tdata (abfd)->phdr = (Elf_Internal_Phdr *) bfd_alloc (abfd, amt); |
||
777 | if (elf_tdata (abfd)->phdr == NULL) |
||
778 | goto got_no_match; |
||
779 | if (bfd_seek (abfd, (file_ptr) i_ehdrp->e_phoff, SEEK_SET) != 0) |
||
780 | goto got_no_match; |
||
781 | i_phdr = elf_tdata (abfd)->phdr; |
||
782 | for (i = 0; i < i_ehdrp->e_phnum; i++, i_phdr++) |
||
783 | { |
||
784 | Elf_External_Phdr x_phdr; |
||
785 | |||
786 | if (bfd_bread (&x_phdr, sizeof x_phdr, abfd) != sizeof x_phdr) |
||
787 | goto got_no_match; |
||
788 | elf_swap_phdr_in (abfd, &x_phdr, i_phdr); |
||
789 | } |
||
790 | } |
||
791 | |||
792 | if (i_ehdrp->e_shstrndx != 0 && i_ehdrp->e_shoff != 0) |
||
793 | { |
||
794 | unsigned int num_sec; |
||
795 | |||
796 | /* Once all of the section headers have been read and converted, we |
||
797 | can start processing them. Note that the first section header is |
||
798 | a dummy placeholder entry, so we ignore it. */ |
||
799 | num_sec = elf_numsections (abfd); |
||
800 | for (shindex = 1; shindex < num_sec; shindex++) |
||
801 | if (!bfd_section_from_shdr (abfd, shindex)) |
||
802 | goto got_no_match; |
||
803 | |||
804 | /* Set up ELF sections for SHF_GROUP and SHF_LINK_ORDER. */ |
||
805 | if (! _bfd_elf_setup_sections (abfd)) |
||
806 | goto got_wrong_format_error; |
||
807 | } |
||
808 | |||
809 | /* Let the backend double check the format and override global |
||
810 | information. */ |
||
811 | if (ebd->elf_backend_object_p) |
||
812 | { |
||
813 | if (! (*ebd->elf_backend_object_p) (abfd)) |
||
814 | goto got_wrong_format_error; |
||
815 | } |
||
816 | |||
817 | /* Remember the entry point specified in the ELF file header. */ |
||
818 | bfd_set_start_address (abfd, i_ehdrp->e_entry); |
||
819 | |||
820 | /* If we have created any reloc sections that are associated with |
||
821 | debugging sections, mark the reloc sections as debugging as well. */ |
||
822 | for (s = abfd->sections; s != NULL; s = s->next) |
||
823 | { |
||
824 | if ((elf_section_data (s)->this_hdr.sh_type == SHT_REL |
||
825 | || elf_section_data (s)->this_hdr.sh_type == SHT_RELA) |
||
826 | && elf_section_data (s)->this_hdr.sh_info > 0) |
||
827 | { |
||
828 | unsigned long targ_index; |
||
829 | asection *targ_sec; |
||
830 | |||
831 | targ_index = elf_section_data (s)->this_hdr.sh_info; |
||
832 | targ_sec = bfd_section_from_elf_index (abfd, targ_index); |
||
833 | if (targ_sec != NULL |
||
834 | && (targ_sec->flags & SEC_DEBUGGING) != 0) |
||
835 | s->flags |= SEC_DEBUGGING; |
||
836 | } |
||
837 | } |
||
838 | return target; |
||
839 | |||
840 | got_wrong_format_error: |
||
841 | bfd_set_error (bfd_error_wrong_format); |
||
842 | |||
843 | got_no_match: |
||
844 | return NULL; |
||
845 | } |
||
846 | |||
847 | /* ELF .o/exec file writing */ |
||
848 | |||
849 | /* Write out the relocs. */ |
||
850 | |||
851 | void |
||
852 | elf_write_relocs (bfd *abfd, asection *sec, void *data) |
||
853 | { |
||
854 | bfd_boolean *failedp = (bfd_boolean *) data; |
||
855 | Elf_Internal_Shdr *rela_hdr; |
||
856 | bfd_vma addr_offset; |
||
857 | void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *); |
||
858 | size_t extsize; |
||
859 | bfd_byte *dst_rela; |
||
860 | unsigned int idx; |
||
861 | asymbol *last_sym; |
||
862 | int last_sym_idx; |
||
863 | |||
864 | /* If we have already failed, don't do anything. */ |
||
865 | if (*failedp) |
||
866 | return; |
||
867 | |||
868 | if ((sec->flags & SEC_RELOC) == 0) |
||
869 | return; |
||
870 | |||
871 | /* The linker backend writes the relocs out itself, and sets the |
||
872 | reloc_count field to zero to inhibit writing them here. Also, |
||
873 | sometimes the SEC_RELOC flag gets set even when there aren't any |
||
874 | relocs. */ |
||
875 | if (sec->reloc_count == 0) |
||
876 | return; |
||
877 | |||
878 | /* If we have opened an existing file for update, reloc_count may be |
||
879 | set even though we are not linking. In that case we have nothing |
||
880 | to do. */ |
||
881 | if (sec->orelocation == NULL) |
||
882 | return; |
||
883 | |||
884 | rela_hdr = elf_section_data (sec)->rela.hdr; |
||
885 | if (rela_hdr == NULL) |
||
886 | rela_hdr = elf_section_data (sec)->rel.hdr; |
||
887 | |||
888 | rela_hdr->sh_size = rela_hdr->sh_entsize * sec->reloc_count; |
||
889 | rela_hdr->contents = (unsigned char *) bfd_alloc (abfd, rela_hdr->sh_size); |
||
890 | if (rela_hdr->contents == NULL) |
||
891 | { |
||
892 | *failedp = TRUE; |
||
893 | return; |
||
894 | } |
||
895 | |||
896 | /* Figure out whether the relocations are RELA or REL relocations. */ |
||
897 | if (rela_hdr->sh_type == SHT_RELA) |
||
898 | { |
||
899 | swap_out = elf_swap_reloca_out; |
||
900 | extsize = sizeof (Elf_External_Rela); |
||
901 | } |
||
902 | else if (rela_hdr->sh_type == SHT_REL) |
||
903 | { |
||
904 | swap_out = elf_swap_reloc_out; |
||
905 | extsize = sizeof (Elf_External_Rel); |
||
906 | } |
||
907 | else |
||
908 | /* Every relocation section should be either an SHT_RELA or an |
||
909 | SHT_REL section. */ |
||
910 | abort (); |
||
911 | |||
912 | /* The address of an ELF reloc is section relative for an object |
||
913 | file, and absolute for an executable file or shared library. |
||
914 | The address of a BFD reloc is always section relative. */ |
||
915 | addr_offset = 0; |
||
916 | if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0) |
||
917 | addr_offset = sec->vma; |
||
918 | |||
919 | /* orelocation has the data, reloc_count has the count... */ |
||
920 | last_sym = 0; |
||
921 | last_sym_idx = 0; |
||
922 | dst_rela = rela_hdr->contents; |
||
923 | |||
924 | for (idx = 0; idx < sec->reloc_count; idx++, dst_rela += extsize) |
||
925 | { |
||
926 | Elf_Internal_Rela src_rela; |
||
927 | arelent *ptr; |
||
928 | asymbol *sym; |
||
929 | int n; |
||
930 | |||
931 | ptr = sec->orelocation[idx]; |
||
932 | sym = *ptr->sym_ptr_ptr; |
||
933 | if (sym == last_sym) |
||
934 | n = last_sym_idx; |
||
935 | else if (bfd_is_abs_section (sym->section) && sym->value == 0) |
||
936 | n = STN_UNDEF; |
||
937 | else |
||
938 | { |
||
939 | last_sym = sym; |
||
940 | n = _bfd_elf_symbol_from_bfd_symbol (abfd, &sym); |
||
941 | if (n < 0) |
||
942 | { |
||
943 | *failedp = TRUE; |
||
944 | return; |
||
945 | } |
||
946 | last_sym_idx = n; |
||
947 | } |
||
948 | |||
949 | if ((*ptr->sym_ptr_ptr)->the_bfd != NULL |
||
950 | && (*ptr->sym_ptr_ptr)->the_bfd->xvec != abfd->xvec |
||
951 | && ! _bfd_elf_validate_reloc (abfd, ptr)) |
||
952 | { |
||
953 | *failedp = TRUE; |
||
954 | return; |
||
955 | } |
||
956 | |||
957 | src_rela.r_offset = ptr->address + addr_offset; |
||
958 | src_rela.r_info = ELF_R_INFO (n, ptr->howto->type); |
||
959 | src_rela.r_addend = ptr->addend; |
||
960 | (*swap_out) (abfd, &src_rela, dst_rela); |
||
961 | } |
||
962 | } |
||
963 | |||
964 | /* Write out the program headers. */ |
||
965 | |||
966 | int |
||
967 | elf_write_out_phdrs (bfd *abfd, |
||
968 | const Elf_Internal_Phdr *phdr, |
||
969 | unsigned int count) |
||
970 | { |
||
971 | while (count--) |
||
972 | { |
||
973 | Elf_External_Phdr extphdr; |
||
974 | elf_swap_phdr_out (abfd, phdr, &extphdr); |
||
975 | if (bfd_bwrite (&extphdr, sizeof (Elf_External_Phdr), abfd) |
||
976 | != sizeof (Elf_External_Phdr)) |
||
977 | return -1; |
||
978 | phdr++; |
||
979 | } |
||
980 | return 0; |
||
981 | } |
||
982 | |||
983 | /* Write out the section headers and the ELF file header. */ |
||
984 | |||
985 | bfd_boolean |
||
986 | elf_write_shdrs_and_ehdr (bfd *abfd) |
||
987 | { |
||
988 | Elf_External_Ehdr x_ehdr; /* Elf file header, external form */ |
||
989 | Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form */ |
||
990 | Elf_External_Shdr *x_shdrp; /* Section header table, external form */ |
||
991 | Elf_Internal_Shdr **i_shdrp; /* Section header table, internal form */ |
||
992 | unsigned int count; |
||
993 | bfd_size_type amt; |
||
994 | |||
995 | i_ehdrp = elf_elfheader (abfd); |
||
996 | i_shdrp = elf_elfsections (abfd); |
||
997 | |||
998 | /* swap the header before spitting it out... */ |
||
999 | |||
1000 | #if DEBUG & 1 |
||
1001 | elf_debug_file (i_ehdrp); |
||
1002 | #endif |
||
1003 | elf_swap_ehdr_out (abfd, i_ehdrp, &x_ehdr); |
||
1004 | amt = sizeof (x_ehdr); |
||
1005 | if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0 |
||
1006 | || bfd_bwrite (&x_ehdr, amt, abfd) != amt) |
||
1007 | return FALSE; |
||
1008 | |||
1009 | /* Some fields in the first section header handle overflow of ehdr |
||
1010 | fields. */ |
||
1011 | if (i_ehdrp->e_phnum >= PN_XNUM) |
||
1012 | i_shdrp[0]->sh_info = i_ehdrp->e_phnum; |
||
1013 | if (i_ehdrp->e_shnum >= (SHN_LORESERVE & 0xffff)) |
||
1014 | i_shdrp[0]->sh_size = i_ehdrp->e_shnum; |
||
1015 | if (i_ehdrp->e_shstrndx >= (SHN_LORESERVE & 0xffff)) |
||
1016 | i_shdrp[0]->sh_link = i_ehdrp->e_shstrndx; |
||
1017 | |||
1018 | /* at this point we've concocted all the ELF sections... */ |
||
1019 | amt = i_ehdrp->e_shnum; |
||
1020 | amt *= sizeof (*x_shdrp); |
||
1021 | x_shdrp = (Elf_External_Shdr *) bfd_alloc (abfd, amt); |
||
1022 | if (!x_shdrp) |
||
1023 | return FALSE; |
||
1024 | |||
1025 | for (count = 0; count < i_ehdrp->e_shnum; i_shdrp++, count++) |
||
1026 | { |
||
1027 | #if DEBUG & 2 |
||
1028 | elf_debug_section (count, *i_shdrp); |
||
1029 | #endif |
||
1030 | elf_swap_shdr_out (abfd, *i_shdrp, x_shdrp + count); |
||
1031 | } |
||
1032 | if (bfd_seek (abfd, (file_ptr) i_ehdrp->e_shoff, SEEK_SET) != 0 |
||
1033 | || bfd_bwrite (x_shdrp, amt, abfd) != amt) |
||
1034 | return FALSE; |
||
1035 | |||
1036 | /* need to dump the string table too... */ |
||
1037 | |||
1038 | return TRUE; |
||
1039 | } |
||
1040 | |||
1041 | bfd_boolean |
||
1042 | elf_checksum_contents (bfd *abfd, |
||
1043 | void (*process) (const void *, size_t, void *), |
||
1044 | void *arg) |
||
1045 | { |
||
1046 | Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd); |
||
1047 | Elf_Internal_Shdr **i_shdrp = elf_elfsections (abfd); |
||
1048 | Elf_Internal_Phdr *i_phdrp = elf_tdata (abfd)->phdr; |
||
1049 | unsigned int count, num; |
||
1050 | |||
1051 | { |
||
1052 | Elf_External_Ehdr x_ehdr; |
||
1053 | Elf_Internal_Ehdr i_ehdr; |
||
1054 | |||
1055 | i_ehdr = *i_ehdrp; |
||
1056 | i_ehdr.e_phoff = i_ehdr.e_shoff = 0; |
||
1057 | elf_swap_ehdr_out (abfd, &i_ehdr, &x_ehdr); |
||
1058 | (*process) (&x_ehdr, sizeof x_ehdr, arg); |
||
1059 | } |
||
1060 | |||
1061 | num = i_ehdrp->e_phnum; |
||
1062 | for (count = 0; count < num; count++) |
||
1063 | { |
||
1064 | Elf_External_Phdr x_phdr; |
||
1065 | elf_swap_phdr_out (abfd, &i_phdrp[count], &x_phdr); |
||
1066 | (*process) (&x_phdr, sizeof x_phdr, arg); |
||
1067 | } |
||
1068 | |||
1069 | num = elf_numsections (abfd); |
||
1070 | for (count = 0; count < num; count++) |
||
1071 | { |
||
1072 | Elf_Internal_Shdr i_shdr; |
||
1073 | Elf_External_Shdr x_shdr; |
||
1074 | bfd_byte *contents, *free_contents; |
||
1075 | |||
1076 | i_shdr = *i_shdrp[count]; |
||
1077 | i_shdr.sh_offset = 0; |
||
1078 | |||
1079 | elf_swap_shdr_out (abfd, &i_shdr, &x_shdr); |
||
1080 | (*process) (&x_shdr, sizeof x_shdr, arg); |
||
1081 | |||
1082 | /* Process the section's contents, if it has some. |
||
1083 | PR ld/12451: Read them in if necessary. */ |
||
1084 | if (i_shdr.sh_type == SHT_NOBITS) |
||
1085 | continue; |
||
1086 | free_contents = NULL; |
||
1087 | contents = i_shdr.contents; |
||
1088 | if (contents == NULL) |
||
1089 | { |
||
1090 | asection *sec; |
||
1091 | |||
1092 | sec = bfd_section_from_elf_index (abfd, count); |
||
1093 | if (sec != NULL) |
||
1094 | { |
||
1095 | contents = sec->contents; |
||
1096 | if (contents == NULL) |
||
1097 | { |
||
1098 | /* Force rereading from file. */ |
||
1099 | sec->flags &= ~SEC_IN_MEMORY; |
||
1100 | if (!bfd_malloc_and_get_section (abfd, sec, &free_contents)) |
||
1101 | continue; |
||
1102 | contents = free_contents; |
||
1103 | } |
||
1104 | } |
||
1105 | } |
||
1106 | if (contents != NULL) |
||
1107 | { |
||
1108 | (*process) (contents, i_shdr.sh_size, arg); |
||
1109 | if (free_contents != NULL) |
||
1110 | free (free_contents); |
||
1111 | } |
||
1112 | } |
||
1113 | |||
1114 | return TRUE; |
||
1115 | } |
||
1116 | |||
1117 | long |
||
1118 | elf_slurp_symbol_table (bfd *abfd, asymbol **symptrs, bfd_boolean dynamic) |
||
1119 | { |
||
1120 | Elf_Internal_Shdr *hdr; |
||
1121 | Elf_Internal_Shdr *verhdr; |
||
1122 | unsigned long symcount; /* Number of external ELF symbols */ |
||
1123 | elf_symbol_type *sym; /* Pointer to current bfd symbol */ |
||
1124 | elf_symbol_type *symbase; /* Buffer for generated bfd symbols */ |
||
1125 | Elf_Internal_Sym *isym; |
||
1126 | Elf_Internal_Sym *isymend; |
||
1127 | Elf_Internal_Sym *isymbuf = NULL; |
||
1128 | Elf_External_Versym *xver; |
||
1129 | Elf_External_Versym *xverbuf = NULL; |
||
1130 | const struct elf_backend_data *ebd; |
||
1131 | bfd_size_type amt; |
||
1132 | |||
1133 | /* Read each raw ELF symbol, converting from external ELF form to |
||
1134 | internal ELF form, and then using the information to create a |
||
1135 | canonical bfd symbol table entry. |
||
1136 | |||
1137 | Note that we allocate the initial bfd canonical symbol buffer |
||
1138 | based on a one-to-one mapping of the ELF symbols to canonical |
||
1139 | symbols. We actually use all the ELF symbols, so there will be no |
||
1140 | space left over at the end. When we have all the symbols, we |
||
1141 | build the caller's pointer vector. */ |
||
1142 | |||
1143 | if (! dynamic) |
||
1144 | { |
||
1145 | hdr = &elf_tdata (abfd)->symtab_hdr; |
||
1146 | verhdr = NULL; |
||
1147 | } |
||
1148 | else |
||
1149 | { |
||
1150 | hdr = &elf_tdata (abfd)->dynsymtab_hdr; |
||
1151 | if (elf_dynversym (abfd) == 0) |
||
1152 | verhdr = NULL; |
||
1153 | else |
||
1154 | verhdr = &elf_tdata (abfd)->dynversym_hdr; |
||
1155 | if ((elf_dynverdef (abfd) != 0 |
||
1156 | && elf_tdata (abfd)->verdef == NULL) |
||
1157 | || (elf_dynverref (abfd) != 0 |
||
1158 | && elf_tdata (abfd)->verref == NULL)) |
||
1159 | { |
||
1160 | if (!_bfd_elf_slurp_version_tables (abfd, FALSE)) |
||
1161 | return -1; |
||
1162 | } |
||
1163 | } |
||
1164 | |||
1165 | ebd = get_elf_backend_data (abfd); |
||
1166 | symcount = hdr->sh_size / sizeof (Elf_External_Sym); |
||
1167 | if (symcount == 0) |
||
1168 | sym = symbase = NULL; |
||
1169 | else |
||
1170 | { |
||
1171 | isymbuf = bfd_elf_get_elf_syms (abfd, hdr, symcount, 0, |
||
1172 | NULL, NULL, NULL); |
||
1173 | if (isymbuf == NULL) |
||
1174 | return -1; |
||
1175 | |||
1176 | amt = symcount; |
||
1177 | amt *= sizeof (elf_symbol_type); |
||
1178 | symbase = (elf_symbol_type *) bfd_zalloc (abfd, amt); |
||
1179 | if (symbase == (elf_symbol_type *) NULL) |
||
1180 | goto error_return; |
||
1181 | |||
1182 | /* Read the raw ELF version symbol information. */ |
||
1183 | if (verhdr != NULL |
||
1184 | && verhdr->sh_size / sizeof (Elf_External_Versym) != symcount) |
||
1185 | { |
||
1186 | (*_bfd_error_handler) |
||
1187 | (_("%s: version count (%ld) does not match symbol count (%ld)"), |
||
1188 | abfd->filename, |
||
1189 | (long) (verhdr->sh_size / sizeof (Elf_External_Versym)), |
||
1190 | symcount); |
||
1191 | |||
1192 | /* Slurp in the symbols without the version information, |
||
1193 | since that is more helpful than just quitting. */ |
||
1194 | verhdr = NULL; |
||
1195 | } |
||
1196 | |||
1197 | if (verhdr != NULL) |
||
1198 | { |
||
1199 | if (bfd_seek (abfd, verhdr->sh_offset, SEEK_SET) != 0) |
||
1200 | goto error_return; |
||
1201 | |||
1202 | xverbuf = (Elf_External_Versym *) bfd_malloc (verhdr->sh_size); |
||
1203 | if (xverbuf == NULL && verhdr->sh_size != 0) |
||
1204 | goto error_return; |
||
1205 | |||
1206 | if (bfd_bread (xverbuf, verhdr->sh_size, abfd) != verhdr->sh_size) |
||
1207 | goto error_return; |
||
1208 | } |
||
1209 | |||
1210 | /* Skip first symbol, which is a null dummy. */ |
||
1211 | xver = xverbuf; |
||
1212 | if (xver != NULL) |
||
1213 | ++xver; |
||
1214 | isymend = isymbuf + symcount; |
||
1215 | for (isym = isymbuf + 1, sym = symbase; isym < isymend; isym++, sym++) |
||
1216 | { |
||
1217 | memcpy (&sym->internal_elf_sym, isym, sizeof (Elf_Internal_Sym)); |
||
1218 | sym->symbol.the_bfd = abfd; |
||
1219 | |||
1220 | sym->symbol.name = bfd_elf_sym_name (abfd, hdr, isym, NULL); |
||
1221 | |||
1222 | sym->symbol.value = isym->st_value; |
||
1223 | |||
1224 | if (isym->st_shndx == SHN_UNDEF) |
||
1225 | { |
||
1226 | sym->symbol.section = bfd_und_section_ptr; |
||
1227 | } |
||
1228 | else if (isym->st_shndx == SHN_ABS) |
||
1229 | { |
||
1230 | sym->symbol.section = bfd_abs_section_ptr; |
||
1231 | } |
||
1232 | else if (isym->st_shndx == SHN_COMMON) |
||
1233 | { |
||
1234 | sym->symbol.section = bfd_com_section_ptr; |
||
1235 | if ((abfd->flags & BFD_PLUGIN) != 0) |
||
1236 | { |
||
1237 | asection *xc = bfd_get_section_by_name (abfd, "COMMON"); |
||
1238 | |||
1239 | if (xc == NULL) |
||
1240 | { |
||
1241 | flagword flags = (SEC_ALLOC | SEC_IS_COMMON | SEC_KEEP |
||
1242 | | SEC_EXCLUDE); |
||
1243 | xc = bfd_make_section_with_flags (abfd, "COMMON", flags); |
||
1244 | if (xc == NULL) |
||
1245 | goto error_return; |
||
1246 | } |
||
1247 | sym->symbol.section = xc; |
||
1248 | } |
||
1249 | /* Elf puts the alignment into the `value' field, and |
||
1250 | the size into the `size' field. BFD wants to see the |
||
1251 | size in the value field, and doesn't care (at the |
||
1252 | moment) about the alignment. */ |
||
1253 | sym->symbol.value = isym->st_size; |
||
1254 | } |
||
1255 | else |
||
1256 | { |
||
1257 | sym->symbol.section |
||
1258 | = bfd_section_from_elf_index (abfd, isym->st_shndx); |
||
1259 | if (sym->symbol.section == NULL) |
||
1260 | { |
||
1261 | /* This symbol is in a section for which we did not |
||
1262 | create a BFD section. Just use bfd_abs_section, |
||
1263 | although it is wrong. FIXME. */ |
||
1264 | sym->symbol.section = bfd_abs_section_ptr; |
||
1265 | } |
||
1266 | } |
||
1267 | |||
1268 | /* If this is a relocatable file, then the symbol value is |
||
1269 | already section relative. */ |
||
1270 | if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0) |
||
1271 | sym->symbol.value -= sym->symbol.section->vma; |
||
1272 | |||
1273 | switch (ELF_ST_BIND (isym->st_info)) |
||
1274 | { |
||
1275 | case STB_LOCAL: |
||
1276 | sym->symbol.flags |= BSF_LOCAL; |
||
1277 | break; |
||
1278 | case STB_GLOBAL: |
||
1279 | if (isym->st_shndx != SHN_UNDEF && isym->st_shndx != SHN_COMMON) |
||
1280 | sym->symbol.flags |= BSF_GLOBAL; |
||
1281 | break; |
||
1282 | case STB_WEAK: |
||
1283 | sym->symbol.flags |= BSF_WEAK; |
||
1284 | break; |
||
1285 | case STB_GNU_UNIQUE: |
||
1286 | sym->symbol.flags |= BSF_GNU_UNIQUE; |
||
1287 | break; |
||
1288 | } |
||
1289 | |||
1290 | switch (ELF_ST_TYPE (isym->st_info)) |
||
1291 | { |
||
1292 | case STT_SECTION: |
||
1293 | sym->symbol.flags |= BSF_SECTION_SYM | BSF_DEBUGGING; |
||
1294 | break; |
||
1295 | case STT_FILE: |
||
1296 | sym->symbol.flags |= BSF_FILE | BSF_DEBUGGING; |
||
1297 | break; |
||
1298 | case STT_FUNC: |
||
1299 | sym->symbol.flags |= BSF_FUNCTION; |
||
1300 | break; |
||
1301 | case STT_COMMON: |
||
1302 | /* FIXME: Do we have to put the size field into the value field |
||
1303 | as we do with symbols in SHN_COMMON sections (see above) ? */ |
||
1304 | /* Fall through. */ |
||
1305 | case STT_OBJECT: |
||
1306 | sym->symbol.flags |= BSF_OBJECT; |
||
1307 | break; |
||
1308 | case STT_TLS: |
||
1309 | sym->symbol.flags |= BSF_THREAD_LOCAL; |
||
1310 | break; |
||
1311 | case STT_RELC: |
||
1312 | sym->symbol.flags |= BSF_RELC; |
||
1313 | break; |
||
1314 | case STT_SRELC: |
||
1315 | sym->symbol.flags |= BSF_SRELC; |
||
1316 | break; |
||
1317 | case STT_GNU_IFUNC: |
||
1318 | sym->symbol.flags |= BSF_GNU_INDIRECT_FUNCTION; |
||
1319 | break; |
||
1320 | } |
||
1321 | |||
1322 | if (dynamic) |
||
1323 | sym->symbol.flags |= BSF_DYNAMIC; |
||
1324 | |||
1325 | if (xver != NULL) |
||
1326 | { |
||
1327 | Elf_Internal_Versym iversym; |
||
1328 | |||
1329 | _bfd_elf_swap_versym_in (abfd, xver, &iversym); |
||
1330 | sym->version = iversym.vs_vers; |
||
1331 | xver++; |
||
1332 | } |
||
1333 | |||
1334 | /* Do some backend-specific processing on this symbol. */ |
||
1335 | if (ebd->elf_backend_symbol_processing) |
||
1336 | (*ebd->elf_backend_symbol_processing) (abfd, &sym->symbol); |
||
1337 | } |
||
1338 | } |
||
1339 | |||
1340 | /* Do some backend-specific processing on this symbol table. */ |
||
1341 | if (ebd->elf_backend_symbol_table_processing) |
||
1342 | (*ebd->elf_backend_symbol_table_processing) (abfd, symbase, symcount); |
||
1343 | |||
1344 | /* We rely on the zalloc to clear out the final symbol entry. */ |
||
1345 | |||
1346 | symcount = sym - symbase; |
||
1347 | |||
1348 | /* Fill in the user's symbol pointer vector if needed. */ |
||
1349 | if (symptrs) |
||
1350 | { |
||
1351 | long l = symcount; |
||
1352 | |||
1353 | sym = symbase; |
||
1354 | while (l-- > 0) |
||
1355 | { |
||
1356 | *symptrs++ = &sym->symbol; |
||
1357 | sym++; |
||
1358 | } |
||
1359 | *symptrs = 0; /* Final null pointer */ |
||
1360 | } |
||
1361 | |||
1362 | if (xverbuf != NULL) |
||
1363 | free (xverbuf); |
||
1364 | if (isymbuf != NULL && hdr->contents != (unsigned char *) isymbuf) |
||
1365 | free (isymbuf); |
||
1366 | return symcount; |
||
1367 | |||
1368 | error_return: |
||
1369 | if (xverbuf != NULL) |
||
1370 | free (xverbuf); |
||
1371 | if (isymbuf != NULL && hdr->contents != (unsigned char *) isymbuf) |
||
1372 | free (isymbuf); |
||
1373 | return -1; |
||
1374 | } |
||
1375 | |||
1376 | /* Read relocations for ASECT from REL_HDR. There are RELOC_COUNT of |
||
1377 | them. */ |
||
1378 | |||
1379 | static bfd_boolean |
||
1380 | elf_slurp_reloc_table_from_section (bfd *abfd, |
||
1381 | asection *asect, |
||
1382 | Elf_Internal_Shdr *rel_hdr, |
||
1383 | bfd_size_type reloc_count, |
||
1384 | arelent *relents, |
||
1385 | asymbol **symbols, |
||
1386 | bfd_boolean dynamic) |
||
1387 | { |
||
1388 | const struct elf_backend_data * const ebd = get_elf_backend_data (abfd); |
||
1389 | void *allocated = NULL; |
||
1390 | bfd_byte *native_relocs; |
||
1391 | arelent *relent; |
||
1392 | unsigned int i; |
||
1393 | int entsize; |
||
1394 | unsigned int symcount; |
||
1395 | |||
1396 | allocated = bfd_malloc (rel_hdr->sh_size); |
||
1397 | if (allocated == NULL) |
||
1398 | goto error_return; |
||
1399 | |||
1400 | if (bfd_seek (abfd, rel_hdr->sh_offset, SEEK_SET) != 0 |
||
1401 | || (bfd_bread (allocated, rel_hdr->sh_size, abfd) |
||
1402 | != rel_hdr->sh_size)) |
||
1403 | goto error_return; |
||
1404 | |||
1405 | native_relocs = (bfd_byte *) allocated; |
||
1406 | |||
1407 | entsize = rel_hdr->sh_entsize; |
||
1408 | BFD_ASSERT (entsize == sizeof (Elf_External_Rel) |
||
1409 | || entsize == sizeof (Elf_External_Rela)); |
||
1410 | |||
1411 | if (dynamic) |
||
1412 | symcount = bfd_get_dynamic_symcount (abfd); |
||
1413 | else |
||
1414 | symcount = bfd_get_symcount (abfd); |
||
1415 | |||
1416 | for (i = 0, relent = relents; |
||
1417 | i < reloc_count; |
||
1418 | i++, relent++, native_relocs += entsize) |
||
1419 | { |
||
1420 | Elf_Internal_Rela rela; |
||
1421 | |||
1422 | if (entsize == sizeof (Elf_External_Rela)) |
||
1423 | elf_swap_reloca_in (abfd, native_relocs, &rela); |
||
1424 | else |
||
1425 | elf_swap_reloc_in (abfd, native_relocs, &rela); |
||
1426 | |||
1427 | /* The address of an ELF reloc is section relative for an object |
||
1428 | file, and absolute for an executable file or shared library. |
||
1429 | The address of a normal BFD reloc is always section relative, |
||
1430 | and the address of a dynamic reloc is absolute.. */ |
||
1431 | if ((abfd->flags & (EXEC_P | DYNAMIC)) == 0 || dynamic) |
||
1432 | relent->address = rela.r_offset; |
||
1433 | else |
||
1434 | relent->address = rela.r_offset - asect->vma; |
||
1435 | |||
1436 | if (ELF_R_SYM (rela.r_info) == STN_UNDEF) |
||
1437 | relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr; |
||
1438 | else if (ELF_R_SYM (rela.r_info) > symcount) |
||
1439 | { |
||
1440 | (*_bfd_error_handler) |
||
1441 | (_("%s(%s): relocation %d has invalid symbol index %ld"), |
||
1442 | abfd->filename, asect->name, i, ELF_R_SYM (rela.r_info)); |
||
1443 | relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr; |
||
1444 | } |
||
1445 | else |
||
1446 | { |
||
1447 | asymbol **ps; |
||
1448 | |||
1449 | ps = symbols + ELF_R_SYM (rela.r_info) - 1; |
||
1450 | |||
1451 | relent->sym_ptr_ptr = ps; |
||
1452 | } |
||
1453 | |||
1454 | relent->addend = rela.r_addend; |
||
1455 | |||
1456 | if ((entsize == sizeof (Elf_External_Rela) |
||
1457 | && ebd->elf_info_to_howto != NULL) |
||
1458 | || ebd->elf_info_to_howto_rel == NULL) |
||
1459 | (*ebd->elf_info_to_howto) (abfd, relent, &rela); |
||
1460 | else |
||
1461 | (*ebd->elf_info_to_howto_rel) (abfd, relent, &rela); |
||
1462 | } |
||
1463 | |||
1464 | if (allocated != NULL) |
||
1465 | free (allocated); |
||
1466 | |||
1467 | return TRUE; |
||
1468 | |||
1469 | error_return: |
||
1470 | if (allocated != NULL) |
||
1471 | free (allocated); |
||
1472 | return FALSE; |
||
1473 | } |
||
1474 | |||
1475 | /* Read in and swap the external relocs. */ |
||
1476 | |||
1477 | bfd_boolean |
||
1478 | elf_slurp_reloc_table (bfd *abfd, |
||
1479 | asection *asect, |
||
1480 | asymbol **symbols, |
||
1481 | bfd_boolean dynamic) |
||
1482 | { |
||
1483 | struct bfd_elf_section_data * const d = elf_section_data (asect); |
||
1484 | Elf_Internal_Shdr *rel_hdr; |
||
1485 | Elf_Internal_Shdr *rel_hdr2; |
||
1486 | bfd_size_type reloc_count; |
||
1487 | bfd_size_type reloc_count2; |
||
1488 | arelent *relents; |
||
1489 | bfd_size_type amt; |
||
1490 | |||
1491 | if (asect->relocation != NULL) |
||
1492 | return TRUE; |
||
1493 | |||
1494 | if (! dynamic) |
||
1495 | { |
||
1496 | if ((asect->flags & SEC_RELOC) == 0 |
||
1497 | || asect->reloc_count == 0) |
||
1498 | return TRUE; |
||
1499 | |||
1500 | rel_hdr = d->rel.hdr; |
||
1501 | reloc_count = rel_hdr ? NUM_SHDR_ENTRIES (rel_hdr) : 0; |
||
1502 | rel_hdr2 = d->rela.hdr; |
||
1503 | reloc_count2 = rel_hdr2 ? NUM_SHDR_ENTRIES (rel_hdr2) : 0; |
||
1504 | |||
1505 | BFD_ASSERT (asect->reloc_count == reloc_count + reloc_count2); |
||
1506 | BFD_ASSERT ((rel_hdr && asect->rel_filepos == rel_hdr->sh_offset) |
||
1507 | || (rel_hdr2 && asect->rel_filepos == rel_hdr2->sh_offset)); |
||
1508 | |||
1509 | } |
||
1510 | else |
||
1511 | { |
||
1512 | /* Note that ASECT->RELOC_COUNT tends not to be accurate in this |
||
1513 | case because relocations against this section may use the |
||
1514 | dynamic symbol table, and in that case bfd_section_from_shdr |
||
1515 | in elf.c does not update the RELOC_COUNT. */ |
||
1516 | if (asect->size == 0) |
||
1517 | return TRUE; |
||
1518 | |||
1519 | rel_hdr = &d->this_hdr; |
||
1520 | reloc_count = NUM_SHDR_ENTRIES (rel_hdr); |
||
1521 | rel_hdr2 = NULL; |
||
1522 | reloc_count2 = 0; |
||
1523 | } |
||
1524 | |||
1525 | amt = (reloc_count + reloc_count2) * sizeof (arelent); |
||
1526 | relents = (arelent *) bfd_alloc (abfd, amt); |
||
1527 | if (relents == NULL) |
||
1528 | return FALSE; |
||
1529 | |||
1530 | if (rel_hdr |
||
1531 | && !elf_slurp_reloc_table_from_section (abfd, asect, |
||
1532 | rel_hdr, reloc_count, |
||
1533 | relents, |
||
1534 | symbols, dynamic)) |
||
1535 | return FALSE; |
||
1536 | |||
1537 | if (rel_hdr2 |
||
1538 | && !elf_slurp_reloc_table_from_section (abfd, asect, |
||
1539 | rel_hdr2, reloc_count2, |
||
1540 | relents + reloc_count, |
||
1541 | symbols, dynamic)) |
||
1542 | return FALSE; |
||
1543 | |||
1544 | asect->relocation = relents; |
||
1545 | return TRUE; |
||
1546 | } |
||
1547 | |||
1548 | #if DEBUG & 2 |
||
1549 | static void |
||
1550 | elf_debug_section (int num, Elf_Internal_Shdr *hdr) |
||
1551 | { |
||
1552 | fprintf (stderr, "\nSection#%d '%s' 0x%.8lx\n", num, |
||
1553 | hdr->bfd_section != NULL ? hdr->bfd_section->name : "", |
||
1554 | (long) hdr); |
||
1555 | fprintf (stderr, |
||
1556 | "sh_name = %ld\tsh_type = %ld\tsh_flags = %ld\n", |
||
1557 | (long) hdr->sh_name, |
||
1558 | (long) hdr->sh_type, |
||
1559 | (long) hdr->sh_flags); |
||
1560 | fprintf (stderr, |
||
1561 | "sh_addr = %ld\tsh_offset = %ld\tsh_size = %ld\n", |
||
1562 | (long) hdr->sh_addr, |
||
1563 | (long) hdr->sh_offset, |
||
1564 | (long) hdr->sh_size); |
||
1565 | fprintf (stderr, |
||
1566 | "sh_link = %ld\tsh_info = %ld\tsh_addralign = %ld\n", |
||
1567 | (long) hdr->sh_link, |
||
1568 | (long) hdr->sh_info, |
||
1569 | (long) hdr->sh_addralign); |
||
1570 | fprintf (stderr, "sh_entsize = %ld\n", |
||
1571 | (long) hdr->sh_entsize); |
||
1572 | fflush (stderr); |
||
1573 | } |
||
1574 | #endif |
||
1575 | |||
1576 | #if DEBUG & 1 |
||
1577 | static void |
||
1578 | elf_debug_file (Elf_Internal_Ehdr *ehdrp) |
||
1579 | { |
||
1580 | fprintf (stderr, "e_entry = 0x%.8lx\n", (long) ehdrp->e_entry); |
||
1581 | fprintf (stderr, "e_phoff = %ld\n", (long) ehdrp->e_phoff); |
||
1582 | fprintf (stderr, "e_phnum = %ld\n", (long) ehdrp->e_phnum); |
||
1583 | fprintf (stderr, "e_phentsize = %ld\n", (long) ehdrp->e_phentsize); |
||
1584 | fprintf (stderr, "e_shoff = %ld\n", (long) ehdrp->e_shoff); |
||
1585 | fprintf (stderr, "e_shnum = %ld\n", (long) ehdrp->e_shnum); |
||
1586 | fprintf (stderr, "e_shentsize = %ld\n", (long) ehdrp->e_shentsize); |
||
1587 | } |
||
1588 | #endif |
||
1589 | |||
1590 | /* Create a new BFD as if by bfd_openr. Rather than opening a file, |
||
1591 | reconstruct an ELF file by reading the segments out of remote memory |
||
1592 | based on the ELF file header at EHDR_VMA and the ELF program headers it |
||
1593 | points to. If not null, *LOADBASEP is filled in with the difference |
||
1594 | between the VMAs from which the segments were read, and the VMAs the |
||
1595 | file headers (and hence BFD's idea of each section's VMA) put them at. |
||
1596 | |||
1597 | The function TARGET_READ_MEMORY is called to copy LEN bytes from the |
||
1598 | remote memory at target address VMA into the local buffer at MYADDR; it |
||
1599 | should return zero on success or an `errno' code on failure. TEMPL must |
||
1600 | be a BFD for a target with the word size and byte order found in the |
||
1601 | remote memory. */ |
||
1602 | |||
1603 | bfd * |
||
1604 | NAME(_bfd_elf,bfd_from_remote_memory) |
||
1605 | (bfd *templ, |
||
1606 | bfd_vma ehdr_vma, |
||
1607 | bfd_vma *loadbasep, |
||
1608 | int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type)) |
||
1609 | { |
||
1610 | Elf_External_Ehdr x_ehdr; /* Elf file header, external form */ |
||
1611 | Elf_Internal_Ehdr i_ehdr; /* Elf file header, internal form */ |
||
1612 | Elf_External_Phdr *x_phdrs; |
||
1613 | Elf_Internal_Phdr *i_phdrs, *last_phdr; |
||
1614 | bfd *nbfd; |
||
1615 | struct bfd_in_memory *bim; |
||
1616 | int contents_size; |
||
1617 | bfd_byte *contents; |
||
1618 | int err; |
||
1619 | unsigned int i; |
||
1620 | bfd_vma loadbase; |
||
1621 | bfd_boolean loadbase_set; |
||
1622 | |||
1623 | /* Read in the ELF header in external format. */ |
||
1624 | err = target_read_memory (ehdr_vma, (bfd_byte *) &x_ehdr, sizeof x_ehdr); |
||
1625 | if (err) |
||
1626 | { |
||
1627 | bfd_set_error (bfd_error_system_call); |
||
1628 | errno = err; |
||
1629 | return NULL; |
||
1630 | } |
||
1631 | |||
1632 | /* Now check to see if we have a valid ELF file, and one that BFD can |
||
1633 | make use of. The magic number must match, the address size ('class') |
||
1634 | and byte-swapping must match our XVEC entry. */ |
||
1635 | |||
1636 | if (! elf_file_p (&x_ehdr) |
||
1637 | || x_ehdr.e_ident[EI_VERSION] != EV_CURRENT |
||
1638 | || x_ehdr.e_ident[EI_CLASS] != ELFCLASS) |
||
1639 | { |
||
1640 | bfd_set_error (bfd_error_wrong_format); |
||
1641 | return NULL; |
||
1642 | } |
||
1643 | |||
1644 | /* Check that file's byte order matches xvec's */ |
||
1645 | switch (x_ehdr.e_ident[EI_DATA]) |
||
1646 | { |
||
1647 | case ELFDATA2MSB: /* Big-endian */ |
||
1648 | if (! bfd_header_big_endian (templ)) |
||
1649 | { |
||
1650 | bfd_set_error (bfd_error_wrong_format); |
||
1651 | return NULL; |
||
1652 | } |
||
1653 | break; |
||
1654 | case ELFDATA2LSB: /* Little-endian */ |
||
1655 | if (! bfd_header_little_endian (templ)) |
||
1656 | { |
||
1657 | bfd_set_error (bfd_error_wrong_format); |
||
1658 | return NULL; |
||
1659 | } |
||
1660 | break; |
||
1661 | case ELFDATANONE: /* No data encoding specified */ |
||
1662 | default: /* Unknown data encoding specified */ |
||
1663 | bfd_set_error (bfd_error_wrong_format); |
||
1664 | return NULL; |
||
1665 | } |
||
1666 | |||
1667 | elf_swap_ehdr_in (templ, &x_ehdr, &i_ehdr); |
||
1668 | |||
1669 | /* The file header tells where to find the program headers. |
||
1670 | These are what we use to actually choose what to read. */ |
||
1671 | |||
1672 | if (i_ehdr.e_phentsize != sizeof (Elf_External_Phdr) || i_ehdr.e_phnum == 0) |
||
1673 | { |
||
1674 | bfd_set_error (bfd_error_wrong_format); |
||
1675 | return NULL; |
||
1676 | } |
||
1677 | |||
1678 | x_phdrs = (Elf_External_Phdr *) |
||
1679 | bfd_malloc (i_ehdr.e_phnum * (sizeof *x_phdrs + sizeof *i_phdrs)); |
||
1680 | if (x_phdrs == NULL) |
||
1681 | { |
||
1682 | bfd_set_error (bfd_error_no_memory); |
||
1683 | return NULL; |
||
1684 | } |
||
1685 | err = target_read_memory (ehdr_vma + i_ehdr.e_phoff, (bfd_byte *) x_phdrs, |
||
1686 | i_ehdr.e_phnum * sizeof x_phdrs[0]); |
||
1687 | if (err) |
||
1688 | { |
||
1689 | free (x_phdrs); |
||
1690 | bfd_set_error (bfd_error_system_call); |
||
1691 | errno = err; |
||
1692 | return NULL; |
||
1693 | } |
||
1694 | i_phdrs = (Elf_Internal_Phdr *) &x_phdrs[i_ehdr.e_phnum]; |
||
1695 | |||
1696 | contents_size = 0; |
||
1697 | last_phdr = NULL; |
||
1698 | loadbase = ehdr_vma; |
||
1699 | loadbase_set = FALSE; |
||
1700 | for (i = 0; i < i_ehdr.e_phnum; ++i) |
||
1701 | { |
||
1702 | elf_swap_phdr_in (templ, &x_phdrs[i], &i_phdrs[i]); |
||
1703 | if (i_phdrs[i].p_type == PT_LOAD) |
||
1704 | { |
||
1705 | bfd_vma segment_end; |
||
1706 | segment_end = (i_phdrs[i].p_offset + i_phdrs[i].p_filesz |
||
1707 | + i_phdrs[i].p_align - 1) & -i_phdrs[i].p_align; |
||
1708 | if (segment_end > (bfd_vma) contents_size) |
||
1709 | contents_size = segment_end; |
||
1710 | |||
1711 | /* LOADADDR is the `Base address' from the gELF specification: |
||
1712 | `lowest p_vaddr value for a PT_LOAD segment' is P_VADDR from the |
||
1713 | first PT_LOAD as PT_LOADs are ordered by P_VADDR. */ |
||
1714 | if (!loadbase_set && (i_phdrs[i].p_offset & -i_phdrs[i].p_align) == 0) |
||
1715 | { |
||
1716 | loadbase = ehdr_vma - (i_phdrs[i].p_vaddr & -i_phdrs[i].p_align); |
||
1717 | loadbase_set = TRUE; |
||
1718 | } |
||
1719 | |||
1720 | last_phdr = &i_phdrs[i]; |
||
1721 | } |
||
1722 | } |
||
1723 | if (last_phdr == NULL) |
||
1724 | { |
||
1725 | /* There were no PT_LOAD segments, so we don't have anything to read. */ |
||
1726 | free (x_phdrs); |
||
1727 | bfd_set_error (bfd_error_wrong_format); |
||
1728 | return NULL; |
||
1729 | } |
||
1730 | |||
1731 | /* Trim the last segment so we don't bother with zeros in the last page |
||
1732 | that are off the end of the file. However, if the extra bit in that |
||
1733 | page includes the section headers, keep them. */ |
||
1734 | if ((bfd_vma) contents_size > last_phdr->p_offset + last_phdr->p_filesz |
||
1735 | && (bfd_vma) contents_size >= (i_ehdr.e_shoff |
||
1736 | + i_ehdr.e_shnum * i_ehdr.e_shentsize)) |
||
1737 | { |
||
1738 | contents_size = last_phdr->p_offset + last_phdr->p_filesz; |
||
1739 | if ((bfd_vma) contents_size < (i_ehdr.e_shoff |
||
1740 | + i_ehdr.e_shnum * i_ehdr.e_shentsize)) |
||
1741 | contents_size = i_ehdr.e_shoff + i_ehdr.e_shnum * i_ehdr.e_shentsize; |
||
1742 | } |
||
1743 | else |
||
1744 | contents_size = last_phdr->p_offset + last_phdr->p_filesz; |
||
1745 | |||
1746 | /* Now we know the size of the whole image we want read in. */ |
||
1747 | contents = (bfd_byte *) bfd_zmalloc (contents_size); |
||
1748 | if (contents == NULL) |
||
1749 | { |
||
1750 | free (x_phdrs); |
||
1751 | bfd_set_error (bfd_error_no_memory); |
||
1752 | return NULL; |
||
1753 | } |
||
1754 | |||
1755 | for (i = 0; i < i_ehdr.e_phnum; ++i) |
||
1756 | if (i_phdrs[i].p_type == PT_LOAD) |
||
1757 | { |
||
1758 | bfd_vma start = i_phdrs[i].p_offset & -i_phdrs[i].p_align; |
||
1759 | bfd_vma end = (i_phdrs[i].p_offset + i_phdrs[i].p_filesz |
||
1760 | + i_phdrs[i].p_align - 1) & -i_phdrs[i].p_align; |
||
1761 | if (end > (bfd_vma) contents_size) |
||
1762 | end = contents_size; |
||
1763 | err = target_read_memory ((loadbase + i_phdrs[i].p_vaddr) |
||
1764 | & -i_phdrs[i].p_align, |
||
1765 | contents + start, end - start); |
||
1766 | if (err) |
||
1767 | { |
||
1768 | free (x_phdrs); |
||
1769 | free (contents); |
||
1770 | bfd_set_error (bfd_error_system_call); |
||
1771 | errno = err; |
||
1772 | return NULL; |
||
1773 | } |
||
1774 | } |
||
1775 | free (x_phdrs); |
||
1776 | |||
1777 | /* If the segments visible in memory didn't include the section headers, |
||
1778 | then clear them from the file header. */ |
||
1779 | if ((bfd_vma) contents_size < (i_ehdr.e_shoff |
||
1780 | + i_ehdr.e_shnum * i_ehdr.e_shentsize)) |
||
1781 | { |
||
1782 | memset (&x_ehdr.e_shoff, 0, sizeof x_ehdr.e_shoff); |
||
1783 | memset (&x_ehdr.e_shnum, 0, sizeof x_ehdr.e_shnum); |
||
1784 | memset (&x_ehdr.e_shstrndx, 0, sizeof x_ehdr.e_shstrndx); |
||
1785 | } |
||
1786 | |||
1787 | /* This will normally have been in the first PT_LOAD segment. But it |
||
1788 | conceivably could be missing, and we might have just changed it. */ |
||
1789 | memcpy (contents, &x_ehdr, sizeof x_ehdr); |
||
1790 | |||
1791 | /* Now we have a memory image of the ELF file contents. Make a BFD. */ |
||
1792 | bim = (struct bfd_in_memory *) bfd_malloc (sizeof (struct bfd_in_memory)); |
||
1793 | if (bim == NULL) |
||
1794 | { |
||
1795 | free (contents); |
||
1796 | bfd_set_error (bfd_error_no_memory); |
||
1797 | return NULL; |
||
1798 | } |
||
1799 | nbfd = _bfd_new_bfd (); |
||
1800 | if (nbfd == NULL) |
||
1801 | { |
||
1802 | free (bim); |
||
1803 | free (contents); |
||
1804 | bfd_set_error (bfd_error_no_memory); |
||
1805 | return NULL; |
||
1806 | } |
||
1807 | nbfd->filename = " |
||
1808 | nbfd->xvec = templ->xvec; |
||
1809 | bim->size = contents_size; |
||
1810 | bim->buffer = contents; |
||
1811 | nbfd->iostream = bim; |
||
1812 | nbfd->flags = BFD_IN_MEMORY; |
||
1813 | nbfd->iovec = &_bfd_memory_iovec; |
||
1814 | nbfd->origin = 0; |
||
1815 | nbfd->direction = read_direction; |
||
1816 | nbfd->mtime = time (NULL); |
||
1817 | nbfd->mtime_set = TRUE; |
||
1818 | |||
1819 | if (loadbasep) |
||
1820 | *loadbasep = loadbase; |
||
1821 | return nbfd; |
||
1822 | } |
||
1823 | |||
1824 | /* Function for ELF_R_INFO. */ |
||
1825 | |||
1826 | bfd_vma |
||
1827 | NAME(elf,r_info) (bfd_vma sym, bfd_vma type) |
||
1828 | { |
||
1829 | return ELF_R_INFO (sym, type); |
||
1830 | } |
||
1831 | |||
1832 | /* Function for ELF_R_SYM. */ |
||
1833 | |||
1834 | bfd_vma |
||
1835 | NAME(elf,r_sym) (bfd_vma r_info) |
||
1836 | { |
||
1837 | return ELF_R_SYM (r_info); |
||
1838 | } |
||
1839 | |||
1840 | #include "elfcore.h" |
||
1841 | |||
1842 | /* Size-dependent data and functions. */ |
||
1843 | const struct elf_size_info NAME(_bfd_elf,size_info) = { |
||
1844 | sizeof (Elf_External_Ehdr), |
||
1845 | sizeof (Elf_External_Phdr), |
||
1846 | sizeof (Elf_External_Shdr), |
||
1847 | sizeof (Elf_External_Rel), |
||
1848 | sizeof (Elf_External_Rela), |
||
1849 | sizeof (Elf_External_Sym), |
||
1850 | sizeof (Elf_External_Dyn), |
||
1851 | sizeof (Elf_External_Note), |
||
1852 | 4, |
||
1853 | 1, |
||
1854 | ARCH_SIZE, LOG_FILE_ALIGN, |
||
1855 | ELFCLASS, EV_CURRENT, |
||
1856 | elf_write_out_phdrs, |
||
1857 | elf_write_shdrs_and_ehdr, |
||
1858 | elf_checksum_contents, |
||
1859 | elf_write_relocs, |
||
1860 | elf_swap_symbol_in, |
||
1861 | elf_swap_symbol_out, |
||
1862 | elf_slurp_reloc_table, |
||
1863 | elf_slurp_symbol_table, |
||
1864 | elf_swap_dyn_in, |
||
1865 | elf_swap_dyn_out, |
||
1866 | elf_swap_reloc_in, |
||
1867 | elf_swap_reloc_out, |
||
1868 | elf_swap_reloca_in, |
||
1869 | elf_swap_reloca_out |
||
1870 | };>>>>>>>>>>>>>>>=>> |