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
  40 void *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 */
  49 void module_free(struct module *mod, void *module_region)
  50 {
  51         FREE_MODULE(module_region);
  52 }
  53
  54 /* We don't need anything special. */
  55 int module_frob_arch_sections(Elf_Ehdr *hdr,
  56                               Elf_Shdr *sechdrs,
  57                               char *secstrings,
  58                               struct module *mod)
  59 {
  60         return 0;
  61 }
  62
  63 int 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
  73 int 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
 112 int module_finalize(const Elf_Ehdr *hdr,
 113                     const Elf_Shdr *sechdrs,
 114                     struct module *me)
 115 {
 116         return 0;
 117 }
 118
 119 void module_arch_cleanup(struct module *mod)
 120 {
 121 }