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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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41 | #include <rtld.h> |
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42 | |||
43 | /** |
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44 | * Process (fixup) all relocations in a relocation table. |
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45 | */ |
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46 | void rel_table_process(module_t *m, elf_rel_t *rt, size_t rt_size) |
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47 | { |
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48 | unsigned bias; |
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49 | int i; |
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50 | |||
51 | size_t rt_entries; |
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52 | size_t r_offset; |
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53 | elf_word r_info; |
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54 | unsigned rel_type; |
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55 | elf_word sym_idx; |
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56 | // uintptr_t sym_addr; |
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57 | |||
58 | elf_symbol_t *sym_table; |
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59 | elf_symbol_t *sym; |
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60 | uint32_t *r_ptr; |
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61 | char *str_tab; |
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62 | |||
63 | printf("parse relocation table\n"); |
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64 | |||
65 | sym_table = m->dyn.sym_tab; |
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66 | bias = m->bias; |
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67 | rt_entries = rt_size / sizeof(elf_rel_t); |
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68 | str_tab = m->dyn.str_tab; |
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69 | |||
70 | printf("address: 0x%x, entries: %d\n", (uintptr_t)rt, rt_entries); |
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71 | |||
72 | for (i = 0; i < rt_entries; ++i) { |
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73 | printf("symbol %d: ", i); |
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74 | r_offset = rt[i].r_offset; |
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75 | r_info = rt[i].r_info; |
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76 | |||
77 | sym_idx = ELF32_R_SYM(r_info); |
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78 | sym = &sym_table[sym_idx]; |
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79 | |||
80 | printf("name '%s', value 0x%x, size 0x%x\n", |
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81 | str_tab + sym->st_name, |
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82 | sym->st_value, |
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83 | sym->st_size); |
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84 | |||
85 | rel_type = ELF32_R_TYPE(r_info); |
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86 | r_ptr = (uint32_t *)(r_offset + bias); |
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87 | |||
88 | printf("rel_type: %x, rel_offset: 0x%x\n", rel_type, r_offset); |
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89 | /* |
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90 | switch (rel_type) { |
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91 | case R_386_GLOB_DAT: |
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92 | case R_386_JUMP_SLOT: |
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93 | sym_addr = sym_table[sym_idx].st_value + bias; |
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94 | kputint(sym_idx); |
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95 | kputint(sym_addr); |
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96 | |||
97 | *r_ptr = sym_addr; |
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98 | break; |
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99 | |||
100 | case R_386_32: |
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101 | sym_addr = sym_table[sym_idx].st_value + bias; |
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102 | kputint(sym_idx); |
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103 | kputint(sym_addr); |
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104 | |||
105 | *r_ptr += sym_addr; |
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106 | break; |
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107 | |||
108 | case R_386_RELATIVE: |
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109 | *r_ptr += bias; |
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110 | break; |
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111 | }*/ |
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112 | } |
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113 | |||
114 | } |
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115 | |||
116 | /** @} |
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117 | */ |