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