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1 /* |
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2 opt.delscn.c - implementation of the elf_delscn(3) function. |
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3 Copyright (C) 1995 - 2001 Michael Riepe |
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4 |
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5 This library is free software; you can redistribute it and/or |
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6 modify it under the terms of the GNU Library General Public |
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7 License as published by the Free Software Foundation; either |
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8 version 2 of the License, or (at your option) any later version. |
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9 |
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10 This library is distributed in the hope that it will be useful, |
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 Library General Public License for more details. |
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14 |
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15 You should have received a copy of the GNU Library General Public |
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16 License along with this library; if not, write to the Free Software |
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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18 */ |
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19 |
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20 #include <private.h> |
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21 |
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22 #ifndef lint |
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23 static const char rcsid[] = "@(#) $Id: opt.delscn.c,v 1.11 2005/05/21 15:39:25 michael Exp $"; |
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24 #endif /* lint */ |
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25 |
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26 static size_t |
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27 _newindex(size_t old, size_t index) { |
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28 return old == index ? SHN_UNDEF : (old > index ? old - 1 : old); |
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29 } |
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30 |
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31 static void |
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32 _elf32_update_shdr(Elf *elf, size_t index) { |
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33 Elf32_Shdr *shdr; |
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34 Elf_Scn *scn; |
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35 |
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36 ((Elf32_Ehdr*)elf->e_ehdr)->e_shnum = elf->e_scn_n->s_index + 1; |
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37 for (scn = elf->e_scn_1; scn; scn = scn->s_link) { |
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38 shdr = &scn->s_shdr32; |
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39 switch (shdr->sh_type) { |
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40 case SHT_REL: |
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41 case SHT_RELA: |
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42 shdr->sh_info = _newindex(shdr->sh_info, index); |
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43 /* fall through */ |
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44 case SHT_DYNSYM: |
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45 case SHT_DYNAMIC: |
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46 case SHT_HASH: |
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47 case SHT_SYMTAB: |
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48 #if __LIBELF_SYMBOL_VERSIONS |
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49 #if __LIBELF_SUN_SYMBOL_VERSIONS |
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50 case SHT_SUNW_verdef: |
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51 case SHT_SUNW_verneed: |
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52 case SHT_SUNW_versym: |
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53 #else /* __LIBELF_SUN_SYMBOL_VERSIONS */ |
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54 case SHT_GNU_verdef: |
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55 case SHT_GNU_verneed: |
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56 case SHT_GNU_versym: |
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57 #endif /* __LIBELF_SUN_SYMBOL_VERSIONS */ |
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58 #endif /* __LIBELF_SYMBOL_VERSIONS */ |
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59 shdr->sh_link = _newindex(shdr->sh_link, index); |
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60 /* fall through */ |
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61 default: |
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62 break; |
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63 } |
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64 } |
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65 } |
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66 |
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67 #if __LIBELF64 |
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68 |
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69 static void |
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70 _elf64_update_shdr(Elf *elf, size_t index) { |
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71 Elf64_Shdr *shdr; |
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72 Elf_Scn *scn; |
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73 |
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74 ((Elf64_Ehdr*)elf->e_ehdr)->e_shnum = elf->e_scn_n->s_index + 1; |
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75 for (scn = elf->e_scn_1; scn; scn = scn->s_link) { |
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76 shdr = &scn->s_shdr64; |
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77 switch (shdr->sh_type) { |
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78 case SHT_REL: |
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79 case SHT_RELA: |
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80 shdr->sh_info = _newindex(shdr->sh_info, index); |
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81 /* fall through */ |
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82 case SHT_DYNSYM: |
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83 case SHT_DYNAMIC: |
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84 case SHT_HASH: |
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85 case SHT_SYMTAB: |
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86 #if __LIBELF_SYMBOL_VERSIONS |
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87 #if __LIBELF_SUN_SYMBOL_VERSIONS |
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88 case SHT_SUNW_verdef: |
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89 case SHT_SUNW_verneed: |
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90 case SHT_SUNW_versym: |
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91 #else /* __LIBELF_SUN_SYMBOL_VERSIONS */ |
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92 case SHT_GNU_verdef: |
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93 case SHT_GNU_verneed: |
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94 case SHT_GNU_versym: |
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95 #endif /* __LIBELF_SUN_SYMBOL_VERSIONS */ |
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96 #endif /* __LIBELF_SYMBOL_VERSIONS */ |
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97 shdr->sh_link = _newindex(shdr->sh_link, index); |
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98 /* fall through */ |
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99 default: |
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100 break; |
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101 } |
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102 } |
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103 } |
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104 |
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105 #endif /* __LIBELF64 */ |
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106 |
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107 size_t |
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108 elf_delscn(Elf *elf, Elf_Scn *scn) { |
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109 Elf_Scn *pscn; |
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110 Scn_Data *sd; |
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111 Scn_Data *tmp; |
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112 size_t index; |
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113 |
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114 if (!elf || !scn) { |
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115 return SHN_UNDEF; |
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116 } |
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117 elf_assert(elf->e_magic == ELF_MAGIC); |
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118 elf_assert(scn->s_magic == SCN_MAGIC); |
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119 elf_assert(elf->e_ehdr); |
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120 if (scn->s_elf != elf) { |
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121 seterr(ERROR_ELFSCNMISMATCH); |
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122 return SHN_UNDEF; |
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123 } |
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124 elf_assert(elf->e_scn_1); |
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125 if (scn == elf->e_scn_1) { |
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126 seterr(ERROR_NULLSCN); |
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127 return SHN_UNDEF; |
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128 } |
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129 |
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130 /* |
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131 * Find previous section. |
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132 */ |
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133 for (pscn = elf->e_scn_1; pscn->s_link; pscn = pscn->s_link) { |
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134 if (pscn->s_link == scn) { |
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135 break; |
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136 } |
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137 } |
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138 if (pscn->s_link != scn) { |
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139 seterr(ERROR_ELFSCNMISMATCH); |
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140 return SHN_UNDEF; |
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141 } |
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142 /* |
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143 * Unlink section. |
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144 */ |
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145 if (elf->e_scn_n == scn) { |
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146 elf->e_scn_n = pscn; |
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147 } |
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148 pscn->s_link = scn->s_link; |
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149 index = scn->s_index; |
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150 /* |
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151 * Free section descriptor and data. |
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152 */ |
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153 for (sd = scn->s_data_1; sd; sd = tmp) { |
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154 elf_assert(sd->sd_magic == DATA_MAGIC); |
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155 elf_assert(sd->sd_scn == scn); |
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156 tmp = sd->sd_link; |
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157 if (sd->sd_free_data && sd->sd_memdata) { |
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158 free(sd->sd_memdata); |
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159 } |
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160 if (sd->sd_freeme) { |
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161 free(sd); |
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162 } |
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163 } |
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164 if ((sd = scn->s_rawdata)) { |
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165 elf_assert(sd->sd_magic == DATA_MAGIC); |
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166 elf_assert(sd->sd_scn == scn); |
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167 if (sd->sd_free_data && sd->sd_memdata) { |
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168 free(sd->sd_memdata); |
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169 } |
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170 if (sd->sd_freeme) { |
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171 free(sd); |
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172 } |
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173 } |
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174 if (scn->s_freeme) { |
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175 elf_assert(scn->s_index > 0); |
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176 free(scn); |
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177 } |
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178 /* |
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179 * Adjust section indices. |
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180 */ |
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181 for (scn = pscn->s_link; scn; scn = scn->s_link) { |
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182 elf_assert(scn->s_index > index); |
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183 scn->s_index--; |
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184 } |
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185 /* |
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186 * Adjust ELF header and well-known section headers. |
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187 */ |
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188 if (elf->e_class == ELFCLASS32) { |
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189 _elf32_update_shdr(elf, index); |
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190 return index; |
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191 } |
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192 #if __LIBELF64 |
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193 else if (elf->e_class == ELFCLASS64) { |
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194 _elf64_update_shdr(elf, index); |
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195 return index; |
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196 } |
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197 #endif /* __LIBELF64 */ |
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198 else if (valid_class(elf->e_class)) { |
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199 seterr(ERROR_UNIMPLEMENTED); |
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200 } |
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201 else { |
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202 seterr(ERROR_UNKNOWN_CLASS); |
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203 } |
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204 return SHN_UNDEF; |
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205 } |