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
  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        /* FIXME: If module_region == mod->init_region, trim exception
  52           table entries. */
  53}
  54
  55/* We don't need anything special. */
  56int module_frob_arch_sections(Elf_Ehdr *hdr,
  57                              Elf_Shdr *sechdrs,
  58                              char *secstrings,
  59                              struct module *mod)
  60{
  61        return 0;
  62}
  63
  64int apply_relocate(Elf32_Shdr *sechdrs,
  65                   const char *strtab,
  66                   unsigned int symindex,
  67                   unsigned int relsec,
  68                   struct module *me)
  69{
  70        printk(KERN_ERR "module %s: REL relocation unsupported\n", me->name);
  71        return -ENOEXEC;
  72}
  73
  74int apply_relocate_add(Elf32_Shdr *sechdrs,
  75                       const char *strtab,
  76                       unsigned int symindex,
  77                       unsigned int relsec,
  78                       struct module *me)
  79{
  80        unsigned int i;
  81        Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr;
  82
  83        DEBUGP ("Applying add relocate section %u to %u\n", relsec,
  84                sechdrs[relsec].sh_info);
  85
  86        for (i = 0; i < sechdrs[relsec].sh_size / sizeof (*rela); i++) {
  87                /* This is where to make the change */
  88                uint32_t *loc
  89                        = ((void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
  90                           + rela[i].r_offset);
  91                /* This is the symbol it is referring to.  Note that all
  92                   undefined symbols have been resolved.  */
  93                Elf32_Sym *sym
  94                        = ((Elf32_Sym *)sechdrs[symindex].sh_addr
  95                           + ELF32_R_SYM (rela[i].r_info));
  96                switch (ELF32_R_TYPE(rela[i].r_info)) {
  97                case R_CRIS_32:
  98                        *loc = sym->st_value + rela[i].r_addend;
  99                        break;
 100                case R_CRIS_32_PCREL:
 101                        *loc = sym->st_value - (unsigned)loc + rela[i].r_addend - 4;
 102                         break;
 103                default:
 104                        printk(KERN_ERR "module %s: Unknown relocation: %u\n",
 105                               me->name, ELF32_R_TYPE(rela[i].r_info));
 106                        return -ENOEXEC;
 107                }
 108        }
 109
 110        return 0;
 111}
 112
 113int module_finalize(const Elf_Ehdr *hdr,
 114                    const Elf_Shdr *sechdrs,
 115                    struct module *me)
 116{
 117        return 0;
 118}
 119
 120void module_arch_cleanup(struct module *mod)
 121{
 122}
 123