Commit | Line | Data |
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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 | ||
08cfeacb JN |
31 | #ifdef CONFIG_ETRAX_KMALLOCED_MODULES |
32 | #define MALLOC_MODULE(size) kmalloc(size, GFP_KERNEL) | |
33 | #define FREE_MODULE(region) kfree(region) | |
34 | #else | |
35 | #define MALLOC_MODULE(size) vmalloc_exec(size) | |
36 | #define FREE_MODULE(region) vfree(region) | |
37 | #endif | |
38 | ||
1da177e4 LT |
39 | void *module_alloc(unsigned long size) |
40 | { | |
41 | if (size == 0) | |
42 | return NULL; | |
08cfeacb | 43 | return MALLOC_MODULE(size); |
1da177e4 LT |
44 | } |
45 | ||
46 | ||
47 | /* Free memory returned from module_alloc */ | |
48 | void module_free(struct module *mod, void *module_region) | |
49 | { | |
08cfeacb | 50 | FREE_MODULE(module_region); |
1da177e4 | 51 | /* FIXME: If module_region == mod->init_region, trim exception |
08cfeacb | 52 | table entries. */ |
1da177e4 LT |
53 | } |
54 | ||
55 | /* We don't need anything special. */ | |
56 | int module_frob_arch_sections(Elf_Ehdr *hdr, | |
57 | Elf_Shdr *sechdrs, | |
58 | char *secstrings, | |
59 | struct module *mod) | |
60 | { | |
61 | return 0; | |
62 | } | |
63 | ||
64 | int apply_relocate(Elf32_Shdr *sechdrs, | |
65 | const char *strtab, | |
66 | unsigned int symindex, | |
67 | unsigned int relsec, | |
68 | struct module *me) | |
69 | { | |
5d01e6ce MS |
70 | printk(KERN_ERR "module %s: REL relocation unsupported\n", me->name); |
71 | return -ENOEXEC; | |
1da177e4 LT |
72 | } |
73 | ||
74 | int apply_relocate_add(Elf32_Shdr *sechdrs, | |
75 | const char *strtab, | |
76 | unsigned int symindex, | |
77 | unsigned int relsec, | |
78 | struct module *me) | |
79 | { | |
80 | unsigned int i; | |
81 | Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr; | |
82 | ||
5d01e6ce | 83 | DEBUGP ("Applying add relocate section %u to %u\n", relsec, |
1da177e4 LT |
84 | sechdrs[relsec].sh_info); |
85 | ||
86 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof (*rela); i++) { | |
87 | /* This is where to make the change */ | |
88 | uint32_t *loc | |
89 | = ((void *)sechdrs[sechdrs[relsec].sh_info].sh_addr | |
90 | + rela[i].r_offset); | |
91 | /* This is the symbol it is referring to. Note that all | |
92 | undefined symbols have been resolved. */ | |
93 | Elf32_Sym *sym | |
94 | = ((Elf32_Sym *)sechdrs[symindex].sh_addr | |
95 | + ELF32_R_SYM (rela[i].r_info)); | |
5d01e6ce MS |
96 | switch (ELF32_R_TYPE(rela[i].r_info)) { |
97 | case R_CRIS_32: | |
98 | *loc = sym->st_value + rela[i].r_addend; | |
99 | break; | |
100 | case R_CRIS_32_PCREL: | |
101 | *loc = sym->st_value - (unsigned)loc + rela[i].r_addend - 4; | |
102 | break; | |
103 | default: | |
104 | printk(KERN_ERR "module %s: Unknown relocation: %u\n", | |
105 | me->name, ELF32_R_TYPE(rela[i].r_info)); | |
106 | return -ENOEXEC; | |
107 | } | |
1da177e4 LT |
108 | } |
109 | ||
110 | return 0; | |
111 | } | |
112 | ||
113 | int module_finalize(const Elf_Ehdr *hdr, | |
114 | const Elf_Shdr *sechdrs, | |
115 | struct module *me) | |
116 | { | |
117 | return 0; | |
118 | } | |
119 | ||
120 | void module_arch_cleanup(struct module *mod) | |
121 | { | |
122 | } |