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3681 | 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 <unistd.h> |
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39 | #include <fcntl.h> |
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40 | #include <loader/pcb.h> |
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41 | |||
42 | /* from librtld */ |
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43 | #include <rtld.h> |
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44 | #include <dynamic.h> |
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45 | #include <elf_load.h> |
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46 | #include <module.h> |
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47 | |||
48 | void program_run(void *entry, pcb_t *pcb); |
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49 | |||
3686 | svoboda | 50 | runtime_env_t dload_re; |
51 | |||
3681 | svoboda | 52 | int main(int argc, char *argv[]) |
53 | { |
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54 | static module_t prog; |
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55 | |||
3686 | svoboda | 56 | runtime_env = &dload_re; |
57 | |||
3681 | svoboda | 58 | DPRINTF("Hello, world! (from dload)\n"); |
59 | if (__pcb->dynamic == NULL) { |
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60 | printf("This is the dynamic loader. It is not supposed " |
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61 | "to be executed directly.\n"); |
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62 | return -1; |
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63 | } |
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64 | |||
65 | /* |
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66 | * First we need to process dynamic sections of the executable |
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67 | * program and insert it into the module graph. |
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68 | */ |
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69 | |||
70 | DPRINTF("Parse program .dynamic section at 0x%x\n", __pcb->dynamic); |
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71 | dynamic_parse(__pcb->dynamic, 0, &prog.dyn); |
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72 | prog.bias = 0; |
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73 | prog.dyn.soname = "[program]"; |
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74 | |||
75 | /* Initialize list of loaded modules */ |
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3686 | svoboda | 76 | list_initialize(&runtime_env->modules_head); |
77 | list_append(&prog.modules_link, &runtime_env->modules_head); |
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3681 | svoboda | 78 | |
79 | /* Pointer to program module. Used as root of the module graph. */ |
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3686 | svoboda | 80 | runtime_env->program = &prog; |
3681 | svoboda | 81 | |
3689 | svoboda | 82 | /* Work around non-existent memory space allocation. */ |
3772 | svoboda | 83 | runtime_env->next_bias = 0x1000000; |
3689 | svoboda | 84 | |
3681 | svoboda | 85 | /* |
86 | * Now we can continue with loading all other modules. |
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87 | */ |
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88 | |||
89 | DPRINTF("Load all program dependencies\n"); |
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90 | module_load_deps(&prog); |
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91 | |||
92 | /* |
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93 | * Now relocate/link all modules together. |
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94 | */ |
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95 | |||
96 | /* Process relocations in all modules */ |
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97 | DPRINTF("Relocate all modules\n"); |
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3689 | svoboda | 98 | modules_process_relocs(&prog); |
3681 | svoboda | 99 | |
3686 | svoboda | 100 | /* Pass runtime evironment pointer through PCB. */ |
101 | __pcb->rtld_runtime = (void *) runtime_env; |
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102 | |||
3681 | svoboda | 103 | /* |
104 | * Finally, run the main program. |
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105 | */ |
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106 | DPRINTF("Run program.. (at 0x%lx)\n", (uintptr_t)__pcb->entry); |
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107 | |||
108 | #ifndef RTLD_DEBUG |
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109 | close_console(); |
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110 | #endif |
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111 | program_run(__pcb->entry, __pcb); |
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112 | |||
113 | /* not reached */ |
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114 | return 0; |
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115 | } |
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116 | |||
117 | /** @} |
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118 | */ |