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| Rev | Author | Line No. | Line |
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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 | */ |