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1 | /* |
1 | /* |
2 | * Copyright (c) 2008 Jiri Svoboda |
2 | * Copyright (c) 2008 Jiri Svoboda |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
7 | * are met: |
8 | * |
8 | * |
9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
13 | * documentation and/or other materials provided with the distribution. |
14 | * - The name of the author may not be used to endorse or promote products |
14 | * - The name of the author may not be used to endorse or promote products |
15 | * derived from this software without specific prior written permission. |
15 | * derived from this software without specific prior written permission. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
27 | */ |
28 | 28 | ||
29 | /** @addtogroup rtld rtld |
29 | /** @addtogroup rtld rtld |
30 | * @brief |
30 | * @brief |
31 | * @{ |
31 | * @{ |
32 | */ |
32 | */ |
33 | /** |
33 | /** |
34 | * @file |
34 | * @file |
35 | */ |
35 | */ |
36 | 36 | ||
37 | #include <stdio.h> |
37 | #include <stdio.h> |
38 | #include <unistd.h> |
38 | #include <unistd.h> |
39 | #include <fcntl.h> |
39 | #include <fcntl.h> |
40 | #include <loader/pcb.h> |
40 | #include <loader/pcb.h> |
41 | 41 | ||
42 | /* from librtld */ |
42 | /* from librtld */ |
43 | #include <rtld.h> |
43 | #include <rtld.h> |
44 | #include <dynamic.h> |
44 | #include <dynamic.h> |
45 | #include <elf_load.h> |
45 | #include <elf_load.h> |
46 | #include <module.h> |
46 | #include <module.h> |
47 | 47 | ||
48 | void program_run(void *entry, pcb_t *pcb); |
48 | void program_run(void *entry, pcb_t *pcb); |
49 | 49 | ||
50 | runtime_env_t dload_re; |
50 | runtime_env_t dload_re; |
51 | 51 | ||
52 | int main(int argc, char *argv[]) |
52 | int main(int argc, char *argv[]) |
53 | { |
53 | { |
54 | static module_t prog; |
54 | static module_t prog; |
55 | 55 | ||
56 | runtime_env = &dload_re; |
56 | runtime_env = &dload_re; |
57 | 57 | ||
58 | DPRINTF("Hello, world! (from dload)\n"); |
58 | DPRINTF("Hello, world! (from dload)\n"); |
59 | if (__pcb->dynamic == NULL) { |
59 | if (__pcb->dynamic == NULL) { |
60 | printf("This is the dynamic loader. It is not supposed " |
60 | printf("This is the dynamic loader. It is not supposed " |
61 | "to be executed directly.\n"); |
61 | "to be executed directly.\n"); |
62 | return -1; |
62 | return -1; |
63 | } |
63 | } |
64 | 64 | ||
65 | /* |
65 | /* |
66 | * First we need to process dynamic sections of the executable |
66 | * First we need to process dynamic sections of the executable |
67 | * program and insert it into the module graph. |
67 | * program and insert it into the module graph. |
68 | */ |
68 | */ |
69 | 69 | ||
70 | DPRINTF("Parse program .dynamic section at 0x%x\n", __pcb->dynamic); |
70 | DPRINTF("Parse program .dynamic section at 0x%x\n", __pcb->dynamic); |
71 | dynamic_parse(__pcb->dynamic, 0, &prog.dyn); |
71 | dynamic_parse(__pcb->dynamic, 0, &prog.dyn); |
72 | prog.bias = 0; |
72 | prog.bias = 0; |
73 | prog.dyn.soname = "[program]"; |
73 | prog.dyn.soname = "[program]"; |
74 | 74 | ||
75 | /* Initialize list of loaded modules */ |
75 | /* Initialize list of loaded modules */ |
76 | list_initialize(&runtime_env->modules_head); |
76 | list_initialize(&runtime_env->modules_head); |
77 | list_append(&prog.modules_link, &runtime_env->modules_head); |
77 | list_append(&prog.modules_link, &runtime_env->modules_head); |
78 | 78 | ||
79 | /* Pointer to program module. Used as root of the module graph. */ |
79 | /* Pointer to program module. Used as root of the module graph. */ |
80 | runtime_env->program = &prog; |
80 | runtime_env->program = &prog; |
81 | 81 | ||
82 | /* Work around non-existent memory space allocation. */ |
82 | /* Work around non-existent memory space allocation. */ |
83 | runtime_env->next_bias = 0x100000; |
83 | runtime_env->next_bias = 0x1000000; |
84 | 84 | ||
85 | /* |
85 | /* |
86 | * Now we can continue with loading all other modules. |
86 | * Now we can continue with loading all other modules. |
87 | */ |
87 | */ |
88 | 88 | ||
89 | DPRINTF("Load all program dependencies\n"); |
89 | DPRINTF("Load all program dependencies\n"); |
90 | module_load_deps(&prog); |
90 | module_load_deps(&prog); |
91 | 91 | ||
92 | /* |
92 | /* |
93 | * Now relocate/link all modules together. |
93 | * Now relocate/link all modules together. |
94 | */ |
94 | */ |
95 | 95 | ||
96 | /* Process relocations in all modules */ |
96 | /* Process relocations in all modules */ |
97 | DPRINTF("Relocate all modules\n"); |
97 | DPRINTF("Relocate all modules\n"); |
98 | modules_process_relocs(&prog); |
98 | modules_process_relocs(&prog); |
99 | 99 | ||
100 | /* Pass runtime evironment pointer through PCB. */ |
100 | /* Pass runtime evironment pointer through PCB. */ |
101 | __pcb->rtld_runtime = (void *) runtime_env; |
101 | __pcb->rtld_runtime = (void *) runtime_env; |
102 | 102 | ||
103 | /* |
103 | /* |
104 | * Finally, run the main program. |
104 | * Finally, run the main program. |
105 | */ |
105 | */ |
106 | DPRINTF("Run program.. (at 0x%lx)\n", (uintptr_t)__pcb->entry); |
106 | DPRINTF("Run program.. (at 0x%lx)\n", (uintptr_t)__pcb->entry); |
107 | 107 | ||
108 | #ifndef RTLD_DEBUG |
108 | #ifndef RTLD_DEBUG |
109 | close_console(); |
109 | close_console(); |
110 | #endif |
110 | #endif |
111 | program_run(__pcb->entry, __pcb); |
111 | program_run(__pcb->entry, __pcb); |
112 | 112 | ||
113 | /* not reached */ |
113 | /* not reached */ |
114 | return 0; |
114 | return 0; |
115 | } |
115 | } |
116 | 116 | ||
117 | /** @} |
117 | /** @} |
118 | */ |
118 | */ |
119 | 119 |