1 | /*- |
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2 | * Copyright (c) 2006,2008 Joseph Koshy |
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3 | * All rights reserved. |
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4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions |
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7 | * are met: |
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8 | * 1. Redistributions of source code must retain the above copyright |
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9 | * notice, this list of conditions and the following disclaimer. |
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10 | * 2. Redistributions in binary form must reproduce the above copyright |
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11 | * notice, this list of conditions and the following disclaimer in the |
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12 | * documentation and/or other materials provided with the distribution. |
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13 | * |
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14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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15 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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16 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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17 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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18 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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19 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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20 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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21 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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22 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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23 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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24 | * SUCH DAMAGE. |
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25 | */ |
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26 | |
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27 | #include <sys/cdefs.h> |
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28 | |
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29 | #include <assert.h> |
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30 | #include <gelf.h> |
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31 | |
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32 | #include "_libelf.h" |
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33 | |
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34 | LIBELF_VCSID("$Id: gelf_sym.c 189 2008-07-20 10:38:08Z jkoshy $"); |
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35 | |
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36 | GElf_Sym * |
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37 | gelf_getsym(Elf_Data *d, int ndx, GElf_Sym *dst) |
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38 | { |
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39 | int ec; |
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40 | Elf *e; |
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41 | Elf_Scn *scn; |
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42 | Elf32_Sym *sym32; |
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43 | Elf64_Sym *sym64; |
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44 | size_t msz; |
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45 | uint32_t sh_type; |
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46 | |
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47 | if (d == NULL || ndx < 0 || dst == NULL || |
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48 | (scn = d->d_scn) == NULL || |
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49 | (e = scn->s_elf) == NULL) { |
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50 | LIBELF_SET_ERROR(ARGUMENT, 0); |
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51 | return (NULL); |
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52 | } |
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53 | |
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54 | ec = e->e_class; |
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55 | assert(ec == ELFCLASS32 || ec == ELFCLASS64); |
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56 | |
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57 | if (ec == ELFCLASS32) |
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58 | sh_type = scn->s_shdr.s_shdr32.sh_type; |
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59 | else |
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60 | sh_type = scn->s_shdr.s_shdr64.sh_type; |
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61 | |
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62 | if (_libelf_xlate_shtype(sh_type) != ELF_T_SYM) { |
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63 | LIBELF_SET_ERROR(ARGUMENT, 0); |
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64 | return (NULL); |
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65 | } |
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66 | |
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67 | msz = _libelf_msize(ELF_T_SYM, ec, e->e_version); |
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68 | |
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69 | assert(msz > 0); |
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70 | |
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71 | if (msz * ndx >= d->d_size) { |
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72 | LIBELF_SET_ERROR(ARGUMENT, 0); |
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73 | return (NULL); |
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74 | } |
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75 | |
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76 | if (ec == ELFCLASS32) { |
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77 | |
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78 | sym32 = (Elf32_Sym *) d->d_buf + ndx; |
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79 | |
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80 | dst->st_name = sym32->st_name; |
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81 | dst->st_value = (Elf64_Addr) sym32->st_value; |
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82 | dst->st_size = (Elf64_Xword) sym32->st_size; |
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83 | dst->st_info = ELF64_ST_INFO(ELF32_ST_BIND(sym32->st_info), |
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84 | ELF32_ST_TYPE(sym32->st_info)); |
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85 | dst->st_other = sym32->st_other; |
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86 | dst->st_shndx = sym32->st_shndx; |
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87 | } else { |
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88 | |
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89 | sym64 = (Elf64_Sym *) d->d_buf + ndx; |
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90 | |
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91 | *dst = *sym64; |
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92 | } |
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93 | |
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94 | return (dst); |
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95 | } |
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96 | |
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97 | int |
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98 | gelf_update_sym(Elf_Data *d, int ndx, GElf_Sym *gs) |
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99 | { |
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100 | int ec; |
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101 | Elf *e; |
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102 | Elf_Scn *scn; |
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103 | Elf32_Sym *sym32; |
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104 | Elf64_Sym *sym64; |
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105 | size_t msz; |
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106 | uint32_t sh_type; |
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107 | |
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108 | if (d == NULL || ndx < 0 || gs == NULL || |
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109 | (scn = d->d_scn) == NULL || |
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110 | (e = scn->s_elf) == NULL) { |
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111 | LIBELF_SET_ERROR(ARGUMENT, 0); |
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112 | return (0); |
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113 | } |
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114 | |
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115 | ec = e->e_class; |
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116 | assert(ec == ELFCLASS32 || ec == ELFCLASS64); |
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117 | |
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118 | if (ec == ELFCLASS32) |
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119 | sh_type = scn->s_shdr.s_shdr32.sh_type; |
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120 | else |
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121 | sh_type = scn->s_shdr.s_shdr64.sh_type; |
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122 | |
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123 | if (_libelf_xlate_shtype(sh_type) != ELF_T_SYM) { |
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124 | LIBELF_SET_ERROR(ARGUMENT, 0); |
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125 | return (0); |
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126 | } |
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127 | |
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128 | msz = _libelf_msize(ELF_T_SYM, ec, e->e_version); |
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129 | assert(msz > 0); |
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130 | |
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131 | if (msz * ndx >= d->d_size) { |
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132 | LIBELF_SET_ERROR(ARGUMENT, 0); |
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133 | return (0); |
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134 | } |
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135 | |
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136 | if (ec == ELFCLASS32) { |
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137 | sym32 = (Elf32_Sym *) d->d_buf + ndx; |
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138 | |
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139 | sym32->st_name = gs->st_name; |
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140 | sym32->st_info = gs->st_info; |
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141 | sym32->st_other = gs->st_other; |
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142 | sym32->st_shndx = gs->st_shndx; |
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143 | |
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144 | LIBELF_COPY_U32(sym32, gs, st_value); |
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145 | LIBELF_COPY_U32(sym32, gs, st_size); |
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146 | } else { |
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147 | sym64 = (Elf64_Sym *) d->d_buf + ndx; |
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148 | |
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149 | *sym64 = *gs; |
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150 | } |
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151 | |
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152 | return (1); |
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153 | } |
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