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| 1 | /* |
1 | /* |
| 2 | * Copyright (c) 2008 Jiri Svoboda |
2 | * Copyright (c) 2008 Jiri Svoboda |
| 3 | * All rights reserved. |
3 | * All rights reserved. |
| 4 | * |
4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
7 | * are met: |
| 8 | * |
8 | * |
| 9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
13 | * documentation and/or other materials provided with the distribution. |
| 14 | * - The name of the author may not be used to endorse or promote products |
14 | * - The name of the author may not be used to endorse or promote products |
| 15 | * derived from this software without specific prior written permission. |
15 | * derived from this software without specific prior written permission. |
| 16 | * |
16 | * |
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | */ |
27 | */ |
| 28 | 28 | ||
| 29 | /** @addtogroup rtld rtld |
29 | /** @addtogroup rtld rtld |
| 30 | * @brief |
30 | * @brief |
| 31 | * @{ |
31 | * @{ |
| 32 | */ |
32 | */ |
| 33 | /** |
33 | /** |
| 34 | * @file |
34 | * @file |
| 35 | */ |
35 | */ |
| 36 | 36 | ||
| 37 | #include <stdio.h> |
37 | #include <stdio.h> |
| 38 | 38 | ||
| 39 | #include <arch.h> |
39 | #include <arch.h> |
| 40 | #include <elf_dyn.h> |
40 | #include <elf_dyn.h> |
| - | 41 | #include <symbol.h> |
|
| 41 | #include <rtld.h> |
42 | #include <rtld.h> |
| 42 | 43 | ||
| 43 | /** |
44 | /** |
| 44 | * Process (fixup) all relocations in a relocation table. |
45 | * Process (fixup) all relocations in a relocation table. |
| 45 | */ |
46 | */ |
| 46 | void rel_table_process(module_t *m, elf_rel_t *rt, size_t rt_size) |
47 | void rel_table_process(module_t *m, elf_rel_t *rt, size_t rt_size, |
| - | 48 | module_t *dest) |
|
| 47 | { |
49 | { |
| 48 | unsigned bias; |
- | |
| 49 | int i; |
50 | int i; |
| 50 | 51 | ||
| 51 | size_t rt_entries; |
52 | size_t rt_entries; |
| 52 | size_t r_offset; |
53 | size_t r_offset; |
| 53 | elf_word r_info; |
54 | elf_word r_info; |
| 54 | unsigned rel_type; |
55 | unsigned rel_type; |
| 55 | elf_word sym_idx; |
56 | elf_word sym_idx; |
| 56 | // uintptr_t sym_addr; |
57 | uintptr_t sym_addr; |
| 57 | 58 | ||
| 58 | elf_symbol_t *sym_table; |
59 | elf_symbol_t *sym_table; |
| 59 | elf_symbol_t *sym; |
60 | elf_symbol_t *sym; |
| 60 | uint32_t *r_ptr; |
61 | uint32_t *r_ptr; |
| 61 | char *str_tab; |
62 | char *str_tab; |
| - | 63 | ||
| - | 64 | elf_symbol_t *sym_def; |
|
| 62 | 65 | ||
| 63 | printf("parse relocation table\n"); |
66 | printf("parse relocation table\n"); |
| 64 | 67 | ||
| 65 | sym_table = m->dyn.sym_tab; |
68 | sym_table = m->dyn.sym_tab; |
| 66 | bias = m->bias; |
- | |
| 67 | rt_entries = rt_size / sizeof(elf_rel_t); |
69 | rt_entries = rt_size / sizeof(elf_rel_t); |
| 68 | str_tab = m->dyn.str_tab; |
70 | str_tab = m->dyn.str_tab; |
| 69 | 71 | ||
| 70 | printf("address: 0x%x, entries: %d\n", (uintptr_t)rt, rt_entries); |
72 | printf("address: 0x%x, entries: %d\n", (uintptr_t)rt, rt_entries); |
| 71 | 73 | ||
| 72 | for (i = 0; i < rt_entries; ++i) { |
74 | for (i = 0; i < rt_entries; ++i) { |
| 73 | printf("symbol %d: ", i); |
75 | printf("symbol %d: ", i); |
| 74 | r_offset = rt[i].r_offset; |
76 | r_offset = rt[i].r_offset; |
| 75 | r_info = rt[i].r_info; |
77 | r_info = rt[i].r_info; |
| 76 | 78 | ||
| 77 | sym_idx = ELF32_R_SYM(r_info); |
79 | sym_idx = ELF32_R_SYM(r_info); |
| 78 | sym = &sym_table[sym_idx]; |
80 | sym = &sym_table[sym_idx]; |
| 79 | 81 | ||
| 80 | printf("name '%s', value 0x%x, size 0x%x\n", |
82 | printf("name '%s', value 0x%x, size 0x%x\n", |
| 81 | str_tab + sym->st_name, |
83 | str_tab + sym->st_name, |
| 82 | sym->st_value, |
84 | sym->st_value, |
| 83 | sym->st_size); |
85 | sym->st_size); |
| 84 | 86 | ||
| 85 | rel_type = ELF32_R_TYPE(r_info); |
87 | rel_type = ELF32_R_TYPE(r_info); |
| 86 | r_ptr = (uint32_t *)(r_offset + bias); |
88 | r_ptr = (uint32_t *)(r_offset + m->bias); |
| 87 | 89 | ||
| 88 | printf("rel_type: %x, rel_offset: 0x%x\n", rel_type, r_offset); |
90 | printf("rel_type: %x, rel_offset: 0x%x\n", rel_type, r_offset); |
| - | 91 | sym_def = symbol_def_find(dest, str_tab + sym->st_name); |
|
| - | 92 | if (sym_def) { |
|
| - | 93 | sym_addr = sym_def->st_value + dest->bias; |
|
| - | 94 | printf("symbol definition found, addr=0x%x\n", sym_addr); |
|
| - | 95 | } else { |
|
| - | 96 | printf("symbol definition not found\n"); |
|
| - | 97 | continue; |
|
| - | 98 | } |
|
| 89 | /* |
99 | |
| 90 | switch (rel_type) { |
100 | switch (rel_type) { |
| 91 | case R_386_GLOB_DAT: |
101 | case R_386_GLOB_DAT: |
| 92 | case R_386_JUMP_SLOT: |
102 | case R_386_JUMP_SLOT: |
| 93 | sym_addr = sym_table[sym_idx].st_value + bias; |
103 | printf("fixup R_386_GLOB_DAT/JUMP_SLOT (b+v)\n"); |
| 94 | kputint(sym_idx); |
- | |
| 95 | kputint(sym_addr); |
- | |
| 96 | - | ||
| 97 | *r_ptr = sym_addr; |
104 | *r_ptr = sym_addr; |
| 98 | break; |
105 | break; |
| 99 | 106 | ||
| 100 | case R_386_32: |
107 | case R_386_32: |
| 101 | sym_addr = sym_table[sym_idx].st_value + bias; |
- | |
| 102 | kputint(sym_idx); |
- | |
| 103 | kputint(sym_addr); |
108 | printf("fixup R_386_32 (b+v+a)\n"); |
| 104 | - | ||
| 105 | *r_ptr += sym_addr; |
109 | *r_ptr += sym_addr; |
| 106 | break; |
110 | break; |
| 107 | |
111 | |
| 108 | case R_386_RELATIVE: |
112 | case R_386_RELATIVE: |
| - | 113 | printf("fixup R_386_RELATIVE (b+a)\n"); |
|
| 109 | *r_ptr += bias; |
114 | *r_ptr += dest->bias; |
| 110 | break; |
115 | break; |
| 111 | }*/ |
116 | } |
| 112 | } |
117 | } |
| 113 | 118 | ||
| 114 | } |
119 | } |
| 115 | 120 | ||
| 116 | /** @} |
121 | /** @} |
| 117 | */ |
122 | */ |
| 118 | 123 | ||