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2978 | 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 | #include <stdlib.h> |
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39 | #include <string.h> |
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40 | |||
41 | #include <rtld.h> |
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42 | #include <symbol.h> |
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43 | #include <elf.h> |
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44 | |||
2980 | svoboda | 45 | static elf_symbol_t *def_find_in_module(char *name, module_t *m) |
2978 | svoboda | 46 | { |
47 | elf_symbol_t *sym_table; |
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48 | elf_symbol_t *sym; |
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49 | elf_word nchain; |
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50 | size_t i; |
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51 | char *s_name; |
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2980 | svoboda | 52 | char *module_name; |
2978 | svoboda | 53 | |
2980 | svoboda | 54 | module_name = m->dyn.soname; |
55 | printf("def_find_in_module('%s', %s)\n", name, module_name); |
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2978 | svoboda | 56 | |
57 | sym_table = m->dyn.sym_tab; |
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58 | nchain = m->dyn.hash[1]; |
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59 | |||
60 | for (i = 0; i < nchain; ++i) { |
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61 | sym = &sym_table[i]; |
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62 | s_name = m->dyn.str_tab + sym->st_name; |
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63 | printf("cmp sym '%s'\n", s_name); |
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64 | if (strcmp(name, s_name) == 0) { |
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2980 | svoboda | 65 | printf("name match\n"); |
66 | if (sym->st_shndx != SHN_UNDEF) { |
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67 | printf("definition found. idx=%d\n", i); |
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68 | return sym; |
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69 | } else { |
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70 | printf("not a definition\n"); |
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71 | } |
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2978 | svoboda | 72 | } |
73 | } |
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74 | |||
75 | printf("not found\n"); |
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76 | return NULL; |
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77 | } |
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78 | |||
2980 | svoboda | 79 | |
80 | elf_symbol_t *symbol_def_find(char *name, module_t **m) |
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81 | { |
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82 | elf_symbol_t *sym; |
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83 | |||
84 | sym = def_find_in_module(name, runtime_env.program); |
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85 | if (sym != NULL) { *m = runtime_env.program; return sym; } |
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86 | |||
87 | sym = def_find_in_module(name, runtime_env.libc); |
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88 | if (sym != NULL) { *m = runtime_env.libc; return sym; } |
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89 | |||
90 | /* sym = def_find_in_module(name, runtime_env.rtld); |
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91 | if (sym != NULL) { *m = runtime_env.rtld; return sym; }*/ |
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92 | |||
93 | printf("symbol found nowhere\n"); |
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94 | *m = NULL; |
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95 | return NULL; |
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96 | } |
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97 | |||
2978 | svoboda | 98 | /** @} |
99 | */ |