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         /* FIXME: If module_region == mod->init_region, trim exception
  52            table entries. */
  53 }
  54
  55 /* We don't need anything special. */
  56 int module_frob_arch_sections(Elf_Ehdr *hdr,
  57                               Elf_Shdr *sechdrs,
  58                               char *secstrings,
  59                               struct module *mod)
  60 {
  61         return 0;
  62 }
  63
  64 int 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
  74 int 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
 113 int module_finalize(const Elf_Ehdr *hdr,
 114                     const Elf_Shdr *sechdrs,
 115                     struct module *me)
 116 {
 117         return 0;
 118 }
 119
 120 void module_arch_cleanup(struct module *mod)
 121 {
 122 }