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
  25#if 0
  26#define DEBUGP printk
  27#else
  28#define DEBUGP(fmt , ...)
  29#endif
  30
  31#ifdef CONFIG_ETRAX_KMALLOCED_MODULES
  32#define MALLOC_MODULE(size) kmalloc(size, GFP_KERNEL)
  33#define FREE_MODULE(region) kfree(region)
  34#else
  35#define MALLOC_MODULE(size) vmalloc_exec(size)
  36#define FREE_MODULE(region) vfree(region)
  37#endif
  38
  39void *module_alloc(unsigned long size)
  40{
  41        if (size == 0)
  42                return NULL;
  43        return MALLOC_MODULE(size);
  44}
  45
  46
  47/* Free memory returned from module_alloc */
  48void module_free(struct module *mod, void *module_region)
  49{
  50        FREE_MODULE(module_region);
  51}
  52
  53/* We don't need anything special. */
  54int module_frob_arch_sections(Elf_Ehdr *hdr,
  55                              Elf_Shdr *sechdrs,
  56                              char *secstrings,
  57                              struct module *mod)
  58{
  59        return 0;
  60}
  61
  62int apply_relocate(Elf32_Shdr *sechdrs,
  63                   const char *strtab,
  64                   unsigned int symindex,
  65                   unsigned int relsec,
  66                   struct module *me)
  67{
  68        printk(KERN_ERR "module %s: REL relocation unsupported\n", me->name);
  69        return -ENOEXEC;
  70}
  71
  72int apply_relocate_add(Elf32_Shdr *sechdrs,
  73                       const char *strtab,
  74                       unsigned int symindex,
  75                       unsigned int relsec,
  76                       struct module *me)
  77{
  78        unsigned int i;
  79        Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr;
  80
  81        DEBUGP ("Applying add relocate section %u to %u\n", relsec,
  82                sechdrs[relsec].sh_info);
  83
  84        for (i = 0; i < sechdrs[relsec].sh_size / sizeof (*rela); i++) {
  85                /* This is where to make the change */
  86                uint32_t *loc
  87                        = ((void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
  88                           + rela[i].r_offset);
  89                /* This is the symbol it is referring to.  Note that all
  90                   undefined symbols have been resolved.  */
  91                Elf32_Sym *sym
  92                        = ((Elf32_Sym *)sechdrs[symindex].sh_addr
  93                           + ELF32_R_SYM (rela[i].r_info));
  94                switch (ELF32_R_TYPE(rela[i].r_info)) {
  95                case R_CRIS_32:
  96                        *loc = sym->st_value + rela[i].r_addend;
  97                        break;
  98                case R_CRIS_32_PCREL:
  99                        *loc = sym->st_value - (unsigned)loc + rela[i].r_addend - 4;
 100                         break;
 101                default:
 102                        printk(KERN_ERR "module %s: Unknown relocation: %u\n",
 103                               me->name, ELF32_R_TYPE(rela[i].r_info));
 104                        return -ENOEXEC;
 105                }
 106        }
 107
 108        return 0;
 109}
 110
 111int module_finalize(const Elf_Ehdr *hdr,
 112                    const Elf_Shdr *sechdrs,
 113                    struct module *me)
 114{
 115        return 0;
 116}
 117
 118void module_arch_cleanup(struct module *mod)
 119{
 120}
 121