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2973 | svoboda | 1 | /* |
2 | * Copyright (c) 2008 Jiri Svoboda |
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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 | * |
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9 | * - Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * - Redistributions in binary form must reproduce the above copyright |
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12 | * notice, this list of conditions and the following disclaimer in the |
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13 | * documentation and/or other materials provided with the distribution. |
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14 | * - The name of the author may not be used to endorse or promote products |
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15 | * derived from this software without specific prior written permission. |
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16 | * |
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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27 | */ |
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28 | |||
29 | /** @addtogroup rtld rtld |
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30 | * @brief |
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31 | * @{ |
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32 | */ |
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33 | /** |
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34 | * @file |
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35 | */ |
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36 | |||
37 | #include <stdio.h> |
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38 | |||
39 | #include <arch.h> |
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40 | #include <elf_dyn.h> |
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2978 | svoboda | 41 | #include <symbol.h> |
2973 | svoboda | 42 | #include <rtld.h> |
43 | |||
44 | /** |
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45 | * Process (fixup) all relocations in a relocation table. |
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46 | */ |
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2978 | svoboda | 47 | void rel_table_process(module_t *m, elf_rel_t *rt, size_t rt_size, |
48 | module_t *dest) |
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2973 | svoboda | 49 | { |
50 | int i; |
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51 | |||
52 | size_t rt_entries; |
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53 | size_t r_offset; |
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54 | elf_word r_info; |
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55 | unsigned rel_type; |
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56 | elf_word sym_idx; |
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2978 | svoboda | 57 | uintptr_t sym_addr; |
2973 | svoboda | 58 | |
59 | elf_symbol_t *sym_table; |
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60 | elf_symbol_t *sym; |
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61 | uint32_t *r_ptr; |
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62 | char *str_tab; |
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2978 | svoboda | 63 | |
64 | elf_symbol_t *sym_def; |
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2973 | svoboda | 65 | |
66 | printf("parse relocation table\n"); |
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67 | |||
68 | sym_table = m->dyn.sym_tab; |
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69 | rt_entries = rt_size / sizeof(elf_rel_t); |
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70 | str_tab = m->dyn.str_tab; |
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71 | |||
72 | printf("address: 0x%x, entries: %d\n", (uintptr_t)rt, rt_entries); |
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73 | |||
74 | for (i = 0; i < rt_entries; ++i) { |
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75 | printf("symbol %d: ", i); |
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76 | r_offset = rt[i].r_offset; |
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77 | r_info = rt[i].r_info; |
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78 | |||
79 | sym_idx = ELF32_R_SYM(r_info); |
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80 | sym = &sym_table[sym_idx]; |
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81 | |||
82 | printf("name '%s', value 0x%x, size 0x%x\n", |
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83 | str_tab + sym->st_name, |
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84 | sym->st_value, |
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85 | sym->st_size); |
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86 | |||
87 | rel_type = ELF32_R_TYPE(r_info); |
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2978 | svoboda | 88 | r_ptr = (uint32_t *)(r_offset + m->bias); |
2973 | svoboda | 89 | |
90 | printf("rel_type: %x, rel_offset: 0x%x\n", rel_type, r_offset); |
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2978 | svoboda | 91 | sym_def = symbol_def_find(dest, str_tab + sym->st_name); |
92 | if (sym_def) { |
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93 | sym_addr = sym_def->st_value + dest->bias; |
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94 | printf("symbol definition found, addr=0x%x\n", sym_addr); |
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95 | } else { |
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96 | printf("symbol definition not found\n"); |
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97 | continue; |
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98 | } |
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99 | |||
2973 | svoboda | 100 | switch (rel_type) { |
101 | case R_386_GLOB_DAT: |
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102 | case R_386_JUMP_SLOT: |
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2978 | svoboda | 103 | printf("fixup R_386_GLOB_DAT/JUMP_SLOT (b+v)\n"); |
2973 | svoboda | 104 | *r_ptr = sym_addr; |
105 | break; |
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106 | |||
107 | case R_386_32: |
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2978 | svoboda | 108 | printf("fixup R_386_32 (b+v+a)\n"); |
2973 | svoboda | 109 | *r_ptr += sym_addr; |
110 | break; |
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111 | |||
112 | case R_386_RELATIVE: |
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2978 | svoboda | 113 | printf("fixup R_386_RELATIVE (b+a)\n"); |
114 | *r_ptr += dest->bias; |
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2973 | svoboda | 115 | break; |
2978 | svoboda | 116 | } |
2973 | svoboda | 117 | } |
118 | |||
119 | } |
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120 | |||
121 | /** @} |
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122 | */ |