| 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 | #include <linux/slab.h> |
| 25 | |
| 26 | #if 0 |
| 27 | #define DEBUGP printk |
| 28 | #else |
| 29 | #define DEBUGP(fmt , ...) |
| 30 | #endif |
| 31 | |
| 32 | #ifdef CONFIG_ETRAX_KMALLOCED_MODULES |
| 33 | void *module_alloc(unsigned long size) |
| 34 | { |
| 35 | return kmalloc(size, GFP_KERNEL); |
| 36 | } |
| 37 | |
| 38 | /* Free memory returned from module_alloc */ |
| 39 | void module_free(struct module *mod, void *module_region) |
| 40 | { |
| 41 | kfree(module_region); |
| 42 | } |
| 43 | #endif |
| 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 | |
| 54 | DEBUGP ("Applying add relocate section %u to %u\n", relsec, |
| 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)); |
| 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 | } |
| 79 | } |
| 80 | |
| 81 | return 0; |
| 82 | } |