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#define DEBUGP(fmt , ...) 26 27void *module_alloc(unsigned long size) 28{ 29 if (size == 0) 30 return NULL; 31 return vmalloc_exec(size); 32} 33 34 35/* Free memory returned from module_alloc */ 36void module_free(struct module *mod, void *module_region) 37{ 38 vfree(module_region); 39} 40 41/* We don't need anything special. */ 42int module_frob_arch_sections(Elf_Ehdr *hdr, 43 Elf_Shdr *sechdrs, 44 char *secstrings, 45 struct module *mod) 46{ 47 return 0; 48} 49 50int apply_relocate(Elf32_Shdr *sechdrs, 51 const char *strtab, 52 unsigned int symindex, 53 unsigned int relsec, 54 struct module *me) 55{ 56 printk(KERN_ERR "module %s: REL relocation unsupported\n", me->name); 57 return -ENOEXEC; 58} 59 60int apply_relocate_add(Elf32_Shdr *sechdrs, 61 const char *strtab, 62 unsigned int symindex, 63 unsigned int relsec, 64 struct module *me) 65{ 66 unsigned int i; 67 Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr; 68 69 DEBUGP ("Applying add relocate section %u to %u\n", relsec, 70 sechdrs[relsec].sh_info); 71 72 for (i = 0; i < sechdrs[relsec].sh_size / sizeof (*rela); i++) { 73 /* This is where to make the change */ 74 uint32_t *loc 75 = ((void *)sechdrs[sechdrs[relsec].sh_info].sh_addr 76 + rela[i].r_offset); 77 /* This is the symbol it is referring to. Note that all 78 undefined symbols have been resolved. */ 79 Elf32_Sym *sym 80 = ((Elf32_Sym *)sechdrs[symindex].sh_addr 81 + ELF32_R_SYM (rela[i].r_info)); 82 switch (ELF32_R_TYPE(rela[i].r_info)) { 83 case R_CRIS_32: 84 *loc = sym->st_value + rela[i].r_addend; 85 break; 86 case R_CRIS_32_PCREL: 87 *loc = sym->st_value - (unsigned)loc + rela[i].r_addend - 4; 88 break; 89 default: 90 printk(KERN_ERR "module %s: Unknown relocation: %u\n", 91 me->name, ELF32_R_TYPE(rela[i].r_info)); 92 return -ENOEXEC; 93 } 94 } 95 96 return 0; 97} 98 99int module_finalize(const Elf_Ehdr *hdr, 100 const Elf_Shdr *sechdrs, 101 struct module *me) 102{ 103 return 0; 104} 105 106void module_arch_cleanup(struct module *mod) 107{ 108} 109