| Kumar Gala | f0c426b | 2008-06-21 02:31:01 +1000 | [diff] [blame^] | 1 | /* Kernel module help for powerpc. |
| 2 | Copyright (C) 2001, 2003 Rusty Russell IBM Corporation. |
| 3 | Copyright (C) 2008 Freescale Semiconductor, Inc. |
| 4 | |
| 5 | This program is free software; you can redistribute it and/or modify |
| 6 | it under the terms of the GNU General Public License as published by |
| 7 | the Free Software Foundation; either version 2 of the License, or |
| 8 | (at your option) any later version. |
| 9 | |
| 10 | This program is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | GNU General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU General Public License |
| 16 | along with this program; if not, write to the Free Software |
| 17 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 18 | */ |
| 19 | #include <linux/module.h> |
| 20 | #include <linux/elf.h> |
| 21 | #include <linux/moduleloader.h> |
| 22 | #include <linux/err.h> |
| 23 | #include <linux/vmalloc.h> |
| 24 | #include <linux/bug.h> |
| 25 | #include <asm/module.h> |
| 26 | #include <asm/uaccess.h> |
| 27 | #include <asm/firmware.h> |
| 28 | #include <linux/sort.h> |
| 29 | |
| 30 | #include "setup.h" |
| 31 | |
| 32 | LIST_HEAD(module_bug_list); |
| 33 | |
| 34 | void *module_alloc(unsigned long size) |
| 35 | { |
| 36 | if (size == 0) |
| 37 | return NULL; |
| 38 | |
| 39 | return vmalloc_exec(size); |
| 40 | } |
| 41 | |
| 42 | /* Free memory returned from module_alloc */ |
| 43 | void module_free(struct module *mod, void *module_region) |
| 44 | { |
| 45 | vfree(module_region); |
| 46 | /* FIXME: If module_region == mod->init_region, trim exception |
| 47 | table entries. */ |
| 48 | } |
| 49 | |
| 50 | static const Elf_Shdr *find_section(const Elf_Ehdr *hdr, |
| 51 | const Elf_Shdr *sechdrs, |
| 52 | const char *name) |
| 53 | { |
| 54 | char *secstrings; |
| 55 | unsigned int i; |
| 56 | |
| 57 | secstrings = (char *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; |
| 58 | for (i = 1; i < hdr->e_shnum; i++) |
| 59 | if (strcmp(secstrings+sechdrs[i].sh_name, name) == 0) |
| 60 | return &sechdrs[i]; |
| 61 | return NULL; |
| 62 | } |
| 63 | |
| 64 | int module_finalize(const Elf_Ehdr *hdr, |
| 65 | const Elf_Shdr *sechdrs, struct module *me) |
| 66 | { |
| 67 | const Elf_Shdr *sect; |
| 68 | int err; |
| 69 | |
| 70 | err = module_bug_finalize(hdr, sechdrs, me); |
| 71 | if (err) |
| 72 | return err; |
| 73 | |
| 74 | /* Apply feature fixups */ |
| 75 | sect = find_section(hdr, sechdrs, "__ftr_fixup"); |
| 76 | if (sect != NULL) |
| 77 | do_feature_fixups(cur_cpu_spec->cpu_features, |
| 78 | (void *)sect->sh_addr, |
| 79 | (void *)sect->sh_addr + sect->sh_size); |
| 80 | |
| 81 | #ifdef CONFIG_PPC64 |
| 82 | sect = find_section(hdr, sechdrs, "__fw_ftr_fixup"); |
| 83 | if (sect != NULL) |
| 84 | do_feature_fixups(powerpc_firmware_features, |
| 85 | (void *)sect->sh_addr, |
| 86 | (void *)sect->sh_addr + sect->sh_size); |
| 87 | #endif |
| 88 | |
| 89 | return 0; |
| 90 | } |
| 91 | |
| 92 | void module_arch_cleanup(struct module *mod) |
| 93 | { |
| 94 | module_bug_cleanup(mod); |
| 95 | } |
| 96 | |
| 97 | struct bug_entry *module_find_bug(unsigned long bugaddr) |
| 98 | { |
| 99 | struct mod_arch_specific *mod; |
| 100 | unsigned int i; |
| 101 | struct bug_entry *bug; |
| 102 | |
| 103 | list_for_each_entry(mod, &module_bug_list, bug_list) { |
| 104 | bug = mod->bug_table; |
| 105 | for (i = 0; i < mod->num_bugs; ++i, ++bug) |
| 106 | if (bugaddr == bug->bug_addr) |
| 107 | return bug; |
| 108 | } |
| 109 | return NULL; |
| 110 | } |