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1da177e4 LT |
1 | /* Kernel module help for i386. |
2 | Copyright (C) 2001 Rusty Russell. | |
3 | ||
4 | This program is free software; you can redistribute it and/or modify | |
5 | it under the terms of the GNU General Public License as published by | |
6 | the Free Software Foundation; either version 2 of the License, or | |
7 | (at your option) any later version. | |
8 | ||
9 | This program is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | GNU General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU General Public License | |
15 | along with this program; if not, write to the Free Software | |
16 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
17 | */ | |
18 | #include <linux/moduleloader.h> | |
19 | #include <linux/elf.h> | |
20 | #include <linux/vmalloc.h> | |
21 | #include <linux/fs.h> | |
22 | #include <linux/string.h> | |
23 | #include <linux/kernel.h> | |
24 | ||
25 | #if 0 | |
26 | #define DEBUGP printk | |
27 | #else | |
28 | #define DEBUGP(fmt , ...) | |
29 | #endif | |
30 | ||
31 | void *module_alloc(unsigned long size) | |
32 | { | |
33 | if (size == 0) | |
34 | return NULL; | |
35 | return vmalloc(size); | |
36 | } | |
37 | ||
38 | ||
39 | /* Free memory returned from module_alloc */ | |
40 | void module_free(struct module *mod, void *module_region) | |
41 | { | |
42 | vfree(module_region); | |
43 | /* FIXME: If module_region == mod->init_region, trim exception | |
44 | table entries. */ | |
45 | } | |
46 | ||
47 | /* We don't need anything special. */ | |
48 | int module_frob_arch_sections(Elf_Ehdr *hdr, | |
49 | Elf_Shdr *sechdrs, | |
50 | char *secstrings, | |
51 | struct module *mod) | |
52 | { | |
53 | return 0; | |
54 | } | |
55 | ||
56 | int apply_relocate(Elf32_Shdr *sechdrs, | |
57 | const char *strtab, | |
58 | unsigned int symindex, | |
59 | unsigned int relsec, | |
60 | struct module *me) | |
61 | { | |
62 | unsigned int i; | |
63 | Elf32_Rel *rel = (void *)sechdrs[relsec].sh_addr; | |
64 | Elf32_Sym *sym; | |
65 | uint32_t *location; | |
66 | ||
67 | DEBUGP("Applying relocate section %u to %u\n", relsec, | |
68 | sechdrs[relsec].sh_info); | |
69 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { | |
70 | /* This is where to make the change */ | |
71 | location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_offset | |
72 | + rel[i].r_offset; | |
73 | /* This is the symbol it is referring to. Note that all | |
74 | undefined symbols have been resolved. */ | |
75 | sym = (Elf32_Sym *)sechdrs[symindex].sh_addr | |
76 | + ELF32_R_SYM(rel[i].r_info); | |
77 | ||
78 | /* We add the value into the location given */ | |
79 | *location += sym->st_value; | |
80 | } | |
81 | return 0; | |
82 | } | |
83 | ||
84 | int apply_relocate_add(Elf32_Shdr *sechdrs, | |
85 | const char *strtab, | |
86 | unsigned int symindex, | |
87 | unsigned int relsec, | |
88 | struct module *me) | |
89 | { | |
90 | unsigned int i; | |
91 | Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr; | |
92 | ||
93 | DEBUGP ("Applying relocate section %u to %u\n", relsec, | |
94 | sechdrs[relsec].sh_info); | |
95 | ||
96 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof (*rela); i++) { | |
97 | /* This is where to make the change */ | |
98 | uint32_t *loc | |
99 | = ((void *)sechdrs[sechdrs[relsec].sh_info].sh_addr | |
100 | + rela[i].r_offset); | |
101 | /* This is the symbol it is referring to. Note that all | |
102 | undefined symbols have been resolved. */ | |
103 | Elf32_Sym *sym | |
104 | = ((Elf32_Sym *)sechdrs[symindex].sh_addr | |
105 | + ELF32_R_SYM (rela[i].r_info)); | |
106 | *loc = sym->st_value + rela[i].r_addend; | |
107 | } | |
108 | ||
109 | return 0; | |
110 | } | |
111 | ||
112 | int module_finalize(const Elf_Ehdr *hdr, | |
113 | const Elf_Shdr *sechdrs, | |
114 | struct module *me) | |
115 | { | |
116 | return 0; | |
117 | } | |
118 | ||
119 | void module_arch_cleanup(struct module *mod) | |
120 | { | |
121 | } |