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Linux/arch/cris/kernel/module.c

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  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 }
 83 

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