Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Jesper Nilsson | 08cfeac | 2008-01-28 16:28:10 +0100 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | void *module_alloc(unsigned long size) |
| 40 | { |
| 41 | if (size == 0) |
| 42 | return NULL; |
Jesper Nilsson | 08cfeac | 2008-01-28 16:28:10 +0100 | [diff] [blame] | 43 | return MALLOC_MODULE(size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | } |
| 45 | |
| 46 | |
| 47 | /* Free memory returned from module_alloc */ |
| 48 | void module_free(struct module *mod, void *module_region) |
| 49 | { |
Jesper Nilsson | 08cfeac | 2008-01-28 16:28:10 +0100 | [diff] [blame] | 50 | FREE_MODULE(module_region); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | /* FIXME: If module_region == mod->init_region, trim exception |
Jesper Nilsson | 08cfeac | 2008-01-28 16:28:10 +0100 | [diff] [blame] | 52 | table entries. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | { |
Mikael Starvik | 5d01e6c | 2005-07-27 11:44:43 -0700 | [diff] [blame] | 70 | printk(KERN_ERR "module %s: REL relocation unsupported\n", me->name); |
| 71 | return -ENOEXEC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Mikael Starvik | 5d01e6c | 2005-07-27 11:44:43 -0700 | [diff] [blame] | 83 | DEBUGP ("Applying add relocate section %u to %u\n", relsec, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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)); |
Mikael Starvik | 5d01e6c | 2005-07-27 11:44:43 -0700 | [diff] [blame] | 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 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | } |