LXR linux/arch/cris/kernel/module.c

   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
  33void *module_alloc(unsigned long size)
  34{
  35        return kmalloc(size, GFP_KERNEL);
  36}
  37
  38/* Free memory returned from module_alloc */
  39void module_free(struct module *mod, void *module_region)
  40{
  41        kfree(module_region);
  42}
  43#endif
  44
  45int 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