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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 | |||
2933 | svoboda | 49 | void _rtld_main(void) |
50 | { |
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2959 | svoboda | 51 | pcb_t *pcb; |
2969 | svoboda | 52 | elf_info_t lib_info; |
2973 | svoboda | 53 | static module_t prog; |
2978 | svoboda | 54 | static module_t lib; |
2981 | svoboda | 55 | module_t *rtld; |
2969 | svoboda | 56 | int rc; |
2933 | svoboda | 57 | |
2959 | svoboda | 58 | printf("Hello, world! (from rtld)\n"); |
59 | getchar(); |
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2933 | svoboda | 60 | |
2981 | svoboda | 61 | /* rtld_dynamic and rtld->bias were filled out by the bootstrap code */ |
62 | rtld = &runtime_env.rtld; |
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63 | dynamic_parse(runtime_env.rtld_dynamic, rtld->bias, &rtld->dyn); |
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64 | |||
2969 | svoboda | 65 | printf("Parse .dynamic section\n"); |
2990 | svoboda | 66 | pcb = __pcb_get(); |
2973 | svoboda | 67 | dynamic_parse(pcb->dynamic, 0, &prog.dyn); |
2978 | svoboda | 68 | prog.bias = 0; |
2980 | svoboda | 69 | prog.dyn.soname = "[program]"; |
2969 | svoboda | 70 | |
2973 | svoboda | 71 | printf("Program requested library '%s'\n", prog.dyn.needed); |
2969 | svoboda | 72 | |
2982 | svoboda | 73 | rc = elf_load_file("/libc.so.0", 0x20000, &lib_info); |
2969 | svoboda | 74 | if (rc < 0) { |
75 | printf("failed to load library\n"); |
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76 | return; |
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77 | } |
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78 | |||
2978 | svoboda | 79 | dynamic_parse(lib_info.dynamic, 0x20000, &lib.dyn); |
80 | lib.bias = 0x20000; |
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2980 | svoboda | 81 | printf("lib.bias=0x%x\n", lib.bias); |
2978 | svoboda | 82 | |
2980 | svoboda | 83 | runtime_env.program = &prog; |
84 | runtime_env.libc = &lib; |
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85 | |||
2973 | svoboda | 86 | /* Parse program's relocation tables */ |
2981 | svoboda | 87 | printf("Resolve references in program\n"); |
2983 | svoboda | 88 | if (prog.dyn.rel != NULL) |
89 | rel_table_process(&prog, prog.dyn.rel, prog.dyn.rel_sz); |
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90 | if (prog.dyn.jmp_rel != NULL) |
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91 | rel_table_process(&prog, prog.dyn.jmp_rel, prog.dyn.plt_rel_sz); |
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2973 | svoboda | 92 | |
2981 | svoboda | 93 | /* Parse lib's relocation tables */ |
94 | printf("Resolve references in library\n"); |
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2983 | svoboda | 95 | if (lib.dyn.rel != NULL) |
96 | rel_table_process(&lib, lib.dyn.rel, lib.dyn.rel_sz); |
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97 | if (lib.dyn.jmp_rel != NULL) |
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98 | rel_table_process(&lib, lib.dyn.jmp_rel, lib.dyn.plt_rel_sz); |
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2981 | svoboda | 99 | |
2980 | svoboda | 100 | printf("lib.bias=0x%x\n", lib.bias); |
101 | |||
2969 | svoboda | 102 | printf("Run program..\n"); |
2959 | svoboda | 103 | pcb->entry(); |
2933 | svoboda | 104 | } |
105 | |||
106 | /** @} |
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107 | */ |