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
  33#define MALLOC_MODULE(size) kmalloc(size, GFP_KERNEL)
  34#define FREE_MODULE(region) kfree(region)
  35#else
  36#define MALLOC_MODULE(size) vmalloc_exec(size)
  37#define FREE_MODULE(region) vfree(region)
  38#endif
  39
  40void *module_alloc(unsigned long size)
  41{
  42        if (size == 0)
  43                return NULL;
  44        return MALLOC_MODULE(size);
  45}
  46
  47
  48/* Free memory returned from module_alloc */
  49void module_free(struct module *mod, void *module_region)
  50{
  51        FREE_MODULE(module_region);
  52}
  53
  54/* We don't need anything special. */
  55int module_frob_arch_sections(Elf_Ehdr *hdr,
  56                              Elf_Shdr *sechdrs,
  57                              char *secstrings,
  58                              struct module *mod)
  59{
  60        return 0;
  61}
  62
  63int apply_relocate(Elf32_Shdr *sechdrs,
  64                   const char *strtab,
  65                   unsigned int symindex,
  66                   unsigned int relsec,
  67                   struct module *me)
  68{
  69        printk(KERN_ERR "module %s: REL relocation unsupported\n", me->name);
  70        return -ENOEXEC;
  71}
  72
  73int apply_relocate_add(Elf32_Shdr *sechdrs,
  74                       const char *strtab,
  75                       unsigned int symindex,
  76                       unsigned int relsec,
  77                       struct module *me)
  78{
  79        unsigned int i;
  80        Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr;
  81
  82        DEBUGP ("Applying add relocate section %u to %u\n", relsec,
  83                sechdrs[relsec].sh_info);
  84
  85        for (i = 0; i < sechdrs[relsec].sh_size / sizeof (*rela); i++) {
  86                /* This is where to make the change */
  87                uint32_t *loc
  88                        = ((void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
  89                           + rela[i].r_offset);
  90                /* This is the symbol it is referring to.  Note that all
  91                   undefined symbols have been resolved.  */
  92                Elf32_Sym *sym
  93                        = ((Elf32_Sym *)sechdrs[symindex].sh_addr
  94                           + ELF32_R_SYM (rela[i].r_info));
  95                switch (ELF32_R_TYPE(rela[i].r_info)) {
  96                case R_CRIS_32:
  97                        *loc = sym->st_value + rela[i].r_addend;
  98                        break;
  99                case R_CRIS_32_PCREL:
 100                        *loc = sym->st_value - (unsigned)loc + rela[i].r_addend - 4;
 101                         break;
 102                default:
 103                        printk(KERN_ERR "module %s: Unknown relocation: %u\n",
 104                               me->name, ELF32_R_TYPE(rela[i].r_info));
 105                        return -ENOEXEC;
 106                }
 107        }
 108
 109        return 0;
 110}
 111
 112int module_finalize(const Elf_Ehdr *hdr,
 113                    const Elf_Shdr *sechdrs,
 114                    struct module *me)
 115{
 116        return 0;
 117}
 118
 119void module_arch_cleanup(struct module *mod)
 120{
 121}
 122