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5197 | serge | 1 | /* ELF core file support for BFD. |
6324 | serge | 2 | Copyright (C) 1995-2015 Free Software Foundation, Inc. |
5197 | serge | 3 | |
4 | This file is part of BFD, the Binary File Descriptor library. |
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5 | |||
6 | This program is free software; you can redistribute it and/or modify |
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7 | it under the terms of the GNU General Public License as published by |
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8 | the Free Software Foundation; either version 3 of the License, or |
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9 | (at your option) any later version. |
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10 | |||
11 | This program is distributed in the hope that it will be useful, |
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12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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14 | GNU General Public License for more details. |
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15 | |||
16 | You should have received a copy of the GNU General Public License |
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17 | along with this program; if not, write to the Free Software |
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18 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
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19 | MA 02110-1301, USA. */ |
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20 | |||
21 | char* |
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22 | elf_core_file_failing_command (bfd *abfd) |
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23 | { |
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24 | return elf_tdata (abfd)->core->command; |
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25 | } |
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26 | |||
27 | int |
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28 | elf_core_file_failing_signal (bfd *abfd) |
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29 | { |
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30 | return elf_tdata (abfd)->core->signal; |
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31 | } |
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32 | |||
33 | int |
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34 | elf_core_file_pid (bfd *abfd) |
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35 | { |
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36 | return elf_tdata (abfd)->core->pid; |
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37 | } |
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38 | |||
39 | bfd_boolean |
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40 | elf_core_file_matches_executable_p (bfd *core_bfd, bfd *exec_bfd) |
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41 | { |
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42 | char* corename; |
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43 | |||
44 | /* xvecs must match if both are ELF files for the same target. */ |
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45 | |||
46 | if (core_bfd->xvec != exec_bfd->xvec) |
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47 | { |
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48 | bfd_set_error (bfd_error_system_call); |
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49 | return FALSE; |
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50 | } |
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51 | |||
52 | /* See if the name in the corefile matches the executable name. */ |
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53 | corename = elf_tdata (core_bfd)->core->program; |
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54 | if (corename != NULL) |
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55 | { |
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56 | const char* execname = strrchr (exec_bfd->filename, '/'); |
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57 | |||
58 | execname = execname ? execname + 1 : exec_bfd->filename; |
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59 | |||
60 | if (strcmp (execname, corename) != 0) |
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61 | return FALSE; |
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62 | } |
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63 | |||
64 | return TRUE; |
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65 | } |
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66 | |||
67 | /* Core files are simply standard ELF formatted files that partition |
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68 | the file using the execution view of the file (program header table) |
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69 | rather than the linking view. In fact, there is no section header |
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70 | table in a core file. |
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71 | |||
72 | The process status information (including the contents of the general |
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73 | register set) and the floating point register set are stored in a |
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74 | segment of type PT_NOTE. We handcraft a couple of extra bfd sections |
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75 | that allow standard bfd access to the general registers (.reg) and the |
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76 | floating point registers (.reg2). */ |
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77 | |||
78 | const bfd_target * |
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79 | elf_core_file_p (bfd *abfd) |
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80 | { |
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81 | Elf_External_Ehdr x_ehdr; /* Elf file header, external form. */ |
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82 | Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form. */ |
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83 | Elf_Internal_Phdr *i_phdrp; /* Elf program header, internal form. */ |
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84 | unsigned int phindex; |
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85 | const struct elf_backend_data *ebd; |
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86 | bfd_size_type amt; |
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87 | |||
88 | /* Read in the ELF header in external format. */ |
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89 | if (bfd_bread (&x_ehdr, sizeof (x_ehdr), abfd) != sizeof (x_ehdr)) |
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90 | { |
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91 | if (bfd_get_error () != bfd_error_system_call) |
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92 | goto wrong; |
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93 | else |
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94 | goto fail; |
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95 | } |
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96 | |||
97 | /* Check the magic number. */ |
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98 | if (! elf_file_p (&x_ehdr)) |
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99 | goto wrong; |
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100 | |||
101 | /* FIXME: Check EI_VERSION here ! */ |
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102 | |||
103 | /* Check the address size ("class"). */ |
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104 | if (x_ehdr.e_ident[EI_CLASS] != ELFCLASS) |
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105 | goto wrong; |
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106 | |||
107 | /* Check the byteorder. */ |
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108 | switch (x_ehdr.e_ident[EI_DATA]) |
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109 | { |
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110 | case ELFDATA2MSB: /* Big-endian. */ |
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111 | if (! bfd_big_endian (abfd)) |
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112 | goto wrong; |
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113 | break; |
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114 | case ELFDATA2LSB: /* Little-endian. */ |
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115 | if (! bfd_little_endian (abfd)) |
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116 | goto wrong; |
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117 | break; |
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118 | default: |
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119 | goto wrong; |
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120 | } |
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121 | |||
122 | /* Give abfd an elf_obj_tdata. */ |
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123 | if (! (*abfd->xvec->_bfd_set_format[bfd_core]) (abfd)) |
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124 | goto fail; |
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125 | |||
126 | /* Swap in the rest of the header, now that we have the byte order. */ |
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127 | i_ehdrp = elf_elfheader (abfd); |
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128 | elf_swap_ehdr_in (abfd, &x_ehdr, i_ehdrp); |
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129 | |||
130 | #if DEBUG & 1 |
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131 | elf_debug_file (i_ehdrp); |
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132 | #endif |
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133 | |||
134 | ebd = get_elf_backend_data (abfd); |
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135 | |||
136 | /* Check that the ELF e_machine field matches what this particular |
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137 | BFD format expects. */ |
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138 | |||
139 | if (ebd->elf_machine_code != i_ehdrp->e_machine |
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140 | && (ebd->elf_machine_alt1 == 0 |
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141 | || i_ehdrp->e_machine != ebd->elf_machine_alt1) |
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142 | && (ebd->elf_machine_alt2 == 0 |
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143 | || i_ehdrp->e_machine != ebd->elf_machine_alt2)) |
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144 | { |
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145 | const bfd_target * const *target_ptr; |
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146 | |||
147 | if (ebd->elf_machine_code != EM_NONE) |
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148 | goto wrong; |
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149 | |||
150 | /* This is the generic ELF target. Let it match any ELF target |
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151 | for which we do not have a specific backend. */ |
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152 | |||
153 | for (target_ptr = bfd_target_vector; *target_ptr != NULL; target_ptr++) |
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154 | { |
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155 | const struct elf_backend_data *back; |
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156 | |||
157 | if ((*target_ptr)->flavour != bfd_target_elf_flavour) |
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158 | continue; |
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159 | back = xvec_get_elf_backend_data (*target_ptr); |
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160 | if (back->s->arch_size != ARCH_SIZE) |
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161 | continue; |
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162 | if (back->elf_machine_code == i_ehdrp->e_machine |
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163 | || (back->elf_machine_alt1 != 0 |
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164 | && i_ehdrp->e_machine == back->elf_machine_alt1) |
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165 | || (back->elf_machine_alt2 != 0 |
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166 | && i_ehdrp->e_machine == back->elf_machine_alt2)) |
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167 | { |
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168 | /* target_ptr is an ELF backend which matches this |
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169 | object file, so reject the generic ELF target. */ |
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170 | goto wrong; |
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171 | } |
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172 | } |
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173 | } |
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174 | |||
175 | /* If there is no program header, or the type is not a core file, then |
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176 | we are hosed. */ |
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177 | if (i_ehdrp->e_phoff == 0 || i_ehdrp->e_type != ET_CORE) |
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178 | goto wrong; |
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179 | |||
180 | /* Does BFD's idea of the phdr size match the size |
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181 | recorded in the file? */ |
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182 | if (i_ehdrp->e_phentsize != sizeof (Elf_External_Phdr)) |
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183 | goto wrong; |
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184 | |||
185 | /* If the program header count is PN_XNUM(0xffff), the actual |
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186 | count is in the first section header. */ |
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187 | if (i_ehdrp->e_shoff != 0 && i_ehdrp->e_phnum == PN_XNUM) |
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188 | { |
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189 | Elf_External_Shdr x_shdr; |
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190 | Elf_Internal_Shdr i_shdr; |
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6324 | serge | 191 | file_ptr where = (file_ptr) i_ehdrp->e_shoff; |
5197 | serge | 192 | |
193 | /* Seek to the section header table in the file. */ |
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6324 | serge | 194 | if (bfd_seek (abfd, where, SEEK_SET) != 0) |
5197 | serge | 195 | goto fail; |
196 | |||
197 | /* Read the first section header at index 0, and convert to internal |
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198 | form. */ |
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199 | if (bfd_bread (&x_shdr, sizeof (x_shdr), abfd) != sizeof (x_shdr)) |
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200 | goto fail; |
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201 | elf_swap_shdr_in (abfd, &x_shdr, &i_shdr); |
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202 | |||
203 | if (i_shdr.sh_info != 0) |
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204 | { |
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205 | i_ehdrp->e_phnum = i_shdr.sh_info; |
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206 | if (i_ehdrp->e_phnum != i_shdr.sh_info) |
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207 | goto wrong; |
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208 | } |
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209 | } |
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210 | |||
211 | /* Sanity check that we can read all of the program headers. |
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212 | It ought to be good enough to just read the last one. */ |
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213 | if (i_ehdrp->e_phnum > 1) |
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214 | { |
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215 | Elf_External_Phdr x_phdr; |
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216 | Elf_Internal_Phdr i_phdr; |
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6324 | serge | 217 | file_ptr where; |
5197 | serge | 218 | |
219 | /* Check that we don't have a totally silly number of |
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220 | program headers. */ |
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221 | if (i_ehdrp->e_phnum > (unsigned int) -1 / sizeof (x_phdr) |
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222 | || i_ehdrp->e_phnum > (unsigned int) -1 / sizeof (i_phdr)) |
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223 | goto wrong; |
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224 | |||
6324 | serge | 225 | where = (file_ptr)(i_ehdrp->e_phoff + (i_ehdrp->e_phnum - 1) * sizeof (x_phdr)); |
5197 | serge | 226 | if ((bfd_size_type) where <= i_ehdrp->e_phoff) |
227 | goto wrong; |
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228 | |||
6324 | serge | 229 | if (bfd_seek (abfd, where, SEEK_SET) != 0) |
5197 | serge | 230 | goto fail; |
231 | if (bfd_bread (&x_phdr, sizeof (x_phdr), abfd) != sizeof (x_phdr)) |
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232 | goto fail; |
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233 | } |
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234 | |||
235 | /* Move to the start of the program headers. */ |
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236 | if (bfd_seek (abfd, (file_ptr) i_ehdrp->e_phoff, SEEK_SET) != 0) |
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237 | goto wrong; |
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238 | |||
239 | /* Allocate space for the program headers. */ |
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240 | amt = sizeof (*i_phdrp) * i_ehdrp->e_phnum; |
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241 | i_phdrp = (Elf_Internal_Phdr *) bfd_alloc (abfd, amt); |
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242 | if (!i_phdrp) |
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243 | goto fail; |
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244 | |||
245 | elf_tdata (abfd)->phdr = i_phdrp; |
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246 | |||
247 | /* Read and convert to internal form. */ |
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248 | for (phindex = 0; phindex < i_ehdrp->e_phnum; ++phindex) |
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249 | { |
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250 | Elf_External_Phdr x_phdr; |
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251 | |||
252 | if (bfd_bread (&x_phdr, sizeof (x_phdr), abfd) != sizeof (x_phdr)) |
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253 | goto fail; |
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254 | |||
255 | elf_swap_phdr_in (abfd, &x_phdr, i_phdrp + phindex); |
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256 | } |
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257 | |||
258 | /* Set the machine architecture. Do this before processing the |
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259 | program headers since we need to know the architecture type |
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260 | when processing the notes of some systems' core files. */ |
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261 | if (! bfd_default_set_arch_mach (abfd, ebd->arch, 0) |
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262 | /* It's OK if this fails for the generic target. */ |
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263 | && ebd->elf_machine_code != EM_NONE) |
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264 | goto fail; |
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265 | |||
266 | /* Let the backend double check the format and override global |
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267 | information. We do this before processing the program headers |
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268 | to allow the correct machine (as opposed to just the default |
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269 | machine) to be set, making it possible for grok_prstatus and |
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270 | grok_psinfo to rely on the mach setting. */ |
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271 | if (ebd->elf_backend_object_p != NULL |
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272 | && ! ebd->elf_backend_object_p (abfd)) |
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273 | goto wrong; |
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274 | |||
275 | /* Process each program header. */ |
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276 | for (phindex = 0; phindex < i_ehdrp->e_phnum; ++phindex) |
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277 | if (! bfd_section_from_phdr (abfd, i_phdrp + phindex, (int) phindex)) |
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278 | goto fail; |
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279 | |||
280 | /* Check for core truncation. */ |
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281 | { |
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282 | bfd_size_type high = 0; |
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283 | struct stat statbuf; |
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284 | for (phindex = 0; phindex < i_ehdrp->e_phnum; ++phindex) |
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285 | { |
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286 | Elf_Internal_Phdr *p = i_phdrp + phindex; |
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287 | if (p->p_filesz) |
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288 | { |
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289 | bfd_size_type current = p->p_offset + p->p_filesz; |
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290 | if (high < current) |
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291 | high = current; |
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292 | } |
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293 | } |
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294 | if (bfd_stat (abfd, &statbuf) == 0) |
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295 | { |
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296 | if ((bfd_size_type) statbuf.st_size < high) |
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297 | { |
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298 | (*_bfd_error_handler) |
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299 | (_("Warning: %B is truncated: expected core file " |
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300 | "size >= %lu, found: %lu."), |
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301 | abfd, (unsigned long) high, (unsigned long) statbuf.st_size); |
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302 | } |
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303 | } |
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304 | } |
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305 | |||
306 | /* Save the entry point from the ELF header. */ |
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307 | bfd_get_start_address (abfd) = i_ehdrp->e_entry; |
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308 | return abfd->xvec; |
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309 | |||
310 | wrong: |
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311 | bfd_set_error (bfd_error_wrong_format); |
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312 | fail: |
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313 | return NULL; |
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314 | }>>>>>=> |