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(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         unsigned int i;
  63         Elf32_Rel *rel = (void *)sechdrs[relsec].sh_addr;
  64         Elf32_Sym *sym;
  65         uint32_t *location;
  66
  67         DEBUGP("Applying relocate section %u to %u\n", relsec,
  68                sechdrs[relsec].sh_info);
  69         for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
  70                 /* This is where to make the change */
  71                 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_offset
  72                         + rel[i].r_offset;
  73                 /* This is the symbol it is referring to.  Note that all
  74                    undefined symbols have been resolved.  */
  75                 sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
  76                         + ELF32_R_SYM(rel[i].r_info);
  77
  78                 /* We add the value into the location given */
  79                 *location += sym->st_value;
  80         }
  81         return 0;
  82 }
  83
  84 int apply_relocate_add(Elf32_Shdr *sechdrs,
  85                        const char *strtab,
  86                        unsigned int symindex,
  87                        unsigned int relsec,
  88                        struct module *me)
  89 {
  90         unsigned int i;
  91         Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr;
  92
  93         DEBUGP ("Applying relocate section %u to %u\n", relsec,
  94                 sechdrs[relsec].sh_info);
  95
  96         for (i = 0; i < sechdrs[relsec].sh_size / sizeof (*rela); i++) {
  97                 /* This is where to make the change */
  98                 uint32_t *loc
  99                         = ((void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
 100                            + rela[i].r_offset);
 101                 /* This is the symbol it is referring to.  Note that all
 102                    undefined symbols have been resolved.  */
 103                 Elf32_Sym *sym
 104                         = ((Elf32_Sym *)sechdrs[symindex].sh_addr
 105                            + ELF32_R_SYM (rela[i].r_info));
 106                 *loc = sym->st_value + rela[i].r_addend;
 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 }