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2933 | 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 | |||
2952 | svoboda | 37 | #include <stdio.h> |
2954 | svoboda | 38 | #include <unistd.h> |
39 | #include <fcntl.h> |
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2952 | svoboda | 40 | |
2965 | svoboda | 41 | #include <rtld.h> |
2968 | svoboda | 42 | #include <dynamic.h> |
2969 | svoboda | 43 | #include <pcb.h> |
44 | #include <elf_load.h> |
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2973 | svoboda | 45 | #include <arch.h> |
2959 | svoboda | 46 | |
2980 | svoboda | 47 | runtime_env_t runtime_env; |
48 | |||
2996 | svoboda | 49 | void module_process_relocs(module_t *m) |
50 | { |
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51 | if (m->dyn.plt_rel == DT_REL) { |
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52 | if (m->dyn.rel != NULL) |
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53 | rel_table_process(m, m->dyn.rel, m->dyn.rel_sz); |
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54 | /* FIXME: this seems wrong */ |
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55 | if (m->dyn.jmp_rel != NULL) |
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56 | rel_table_process(m, m->dyn.jmp_rel, m->dyn.plt_rel_sz); |
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57 | } else { /* (m->dyn.plt_rel == DT_RELA) */ |
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58 | printf("table type DT_RELA\n"); |
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59 | if (m->dyn.rela != NULL) { |
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60 | printf("non-empty\n"); |
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61 | rela_table_process(m, m->dyn.rela, m->dyn.rela_sz); |
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62 | } |
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63 | } |
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64 | } |
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65 | |||
2933 | svoboda | 66 | void _rtld_main(void) |
67 | { |
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2959 | svoboda | 68 | pcb_t *pcb; |
2969 | svoboda | 69 | elf_info_t lib_info; |
2973 | svoboda | 70 | static module_t prog; |
2978 | svoboda | 71 | static module_t lib; |
2981 | svoboda | 72 | module_t *rtld; |
2969 | svoboda | 73 | int rc; |
2933 | svoboda | 74 | |
2959 | svoboda | 75 | printf("Hello, world! (from rtld)\n"); |
2996 | svoboda | 76 | // getchar(); |
2933 | svoboda | 77 | |
2981 | svoboda | 78 | /* rtld_dynamic and rtld->bias were filled out by the bootstrap code */ |
79 | rtld = &runtime_env.rtld; |
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2996 | svoboda | 80 | printf("Parse rtld .dynamic section at 0x%x\n", runtime_env.rtld_dynamic); |
2981 | svoboda | 81 | dynamic_parse(runtime_env.rtld_dynamic, rtld->bias, &rtld->dyn); |
2996 | svoboda | 82 | // getchar(); |
2981 | svoboda | 83 | |
2990 | svoboda | 84 | pcb = __pcb_get(); |
2996 | svoboda | 85 | printf("Parse program .dynamic section at 0x%x\n", pcb->dynamic); |
2973 | svoboda | 86 | dynamic_parse(pcb->dynamic, 0, &prog.dyn); |
2978 | svoboda | 87 | prog.bias = 0; |
2980 | svoboda | 88 | prog.dyn.soname = "[program]"; |
2969 | svoboda | 89 | |
2973 | svoboda | 90 | printf("Program requested library '%s'\n", prog.dyn.needed); |
2996 | svoboda | 91 | // getchar(); |
2969 | svoboda | 92 | |
2982 | svoboda | 93 | rc = elf_load_file("/libc.so.0", 0x20000, &lib_info); |
2969 | svoboda | 94 | if (rc < 0) { |
95 | printf("failed to load library\n"); |
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96 | return; |
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97 | } |
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98 | |||
2978 | svoboda | 99 | dynamic_parse(lib_info.dynamic, 0x20000, &lib.dyn); |
100 | lib.bias = 0x20000; |
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2980 | svoboda | 101 | printf("lib.bias=0x%x\n", lib.bias); |
2978 | svoboda | 102 | |
2980 | svoboda | 103 | runtime_env.program = &prog; |
104 | runtime_env.libc = &lib; |
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105 | |||
2973 | svoboda | 106 | /* Parse program's relocation tables */ |
2981 | svoboda | 107 | printf("Resolve references in program\n"); |
2996 | svoboda | 108 | module_process_relocs(&prog); |
2973 | svoboda | 109 | |
2981 | svoboda | 110 | /* Parse lib's relocation tables */ |
111 | printf("Resolve references in library\n"); |
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2996 | svoboda | 112 | module_process_relocs(&lib); |
2981 | svoboda | 113 | |
2980 | svoboda | 114 | printf("lib.bias=0x%x\n", lib.bias); |
115 | |||
2996 | svoboda | 116 | printf("Run program.. (at 0x%x)\n", (uintptr_t)pcb->entry); |
117 | getchar(); |
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2959 | svoboda | 118 | pcb->entry(); |
2933 | svoboda | 119 | } |
120 | |||
121 | /** @} |
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122 | */ |