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