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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> | |
5a0e3ad6 | 24 | #include <linux/slab.h> |
1da177e4 LT |
25 | |
26 | #if 0 | |
27 | #define DEBUGP printk | |
28 | #else | |
29 | #define DEBUGP(fmt , ...) | |
30 | #endif | |
31 | ||
08cfeacb | 32 | #ifdef CONFIG_ETRAX_KMALLOCED_MODULES |
1da177e4 LT |
33 | void *module_alloc(unsigned long size) |
34 | { | |
66574cc0 | 35 | return kmalloc(size, GFP_KERNEL); |
1da177e4 LT |
36 | } |
37 | ||
1da177e4 | 38 | /* Free memory returned from module_alloc */ |
be1f221c | 39 | void module_memfree(void *module_region) |
1da177e4 | 40 | { |
66574cc0 | 41 | kfree(module_region); |
1da177e4 | 42 | } |
66574cc0 | 43 | #endif |
1da177e4 LT |
44 | |
45 | int apply_relocate_add(Elf32_Shdr *sechdrs, | |
46 | const char *strtab, | |
47 | unsigned int symindex, | |
48 | unsigned int relsec, | |
49 | struct module *me) | |
50 | { | |
51 | unsigned int i; | |
52 | Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr; | |
53 | ||
5d01e6ce | 54 | DEBUGP ("Applying add relocate section %u to %u\n", relsec, |
1da177e4 LT |
55 | sechdrs[relsec].sh_info); |
56 | ||
57 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof (*rela); i++) { | |
58 | /* This is where to make the change */ | |
59 | uint32_t *loc | |
60 | = ((void *)sechdrs[sechdrs[relsec].sh_info].sh_addr | |
61 | + rela[i].r_offset); | |
62 | /* This is the symbol it is referring to. Note that all | |
63 | undefined symbols have been resolved. */ | |
64 | Elf32_Sym *sym | |
65 | = ((Elf32_Sym *)sechdrs[symindex].sh_addr | |
66 | + ELF32_R_SYM (rela[i].r_info)); | |
5d01e6ce MS |
67 | switch (ELF32_R_TYPE(rela[i].r_info)) { |
68 | case R_CRIS_32: | |
69 | *loc = sym->st_value + rela[i].r_addend; | |
70 | break; | |
71 | case R_CRIS_32_PCREL: | |
72 | *loc = sym->st_value - (unsigned)loc + rela[i].r_addend - 4; | |
73 | break; | |
74 | default: | |
75 | printk(KERN_ERR "module %s: Unknown relocation: %u\n", | |
76 | me->name, ELF32_R_TYPE(rela[i].r_info)); | |
77 | return -ENOEXEC; | |
78 | } | |
1da177e4 LT |
79 | } |
80 | ||
81 | return 0; | |
82 | } |