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module.c

/*  Kernel module help for i386.
    Copyright (C) 2001 Rusty Russell.

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/
#include <linux/moduleloader.h>
#include <linux/elf.h>
#include <linux/vmalloc.h>
#include <linux/fs.h>
#include <linux/string.h>
#include <linux/kernel.h>

#if 0
#define DEBUGP printk
#else
#define DEBUGP(fmt , ...)
#endif

#ifdef CONFIG_ETRAX_KMALLOCED_MODULES
#define MALLOC_MODULE(size) kmalloc(size, GFP_KERNEL)
#define FREE_MODULE(region) kfree(region)
#else
#define MALLOC_MODULE(size) vmalloc_exec(size)
#define FREE_MODULE(region) vfree(region)
#endif

void *module_alloc(unsigned long size)
{
      if (size == 0)
            return NULL;
      return MALLOC_MODULE(size);
}


/* Free memory returned from module_alloc */
void module_free(struct module *mod, void *module_region)
{
      FREE_MODULE(module_region);
}

/* We don't need anything special. */
int module_frob_arch_sections(Elf_Ehdr *hdr,
                        Elf_Shdr *sechdrs,
                        char *secstrings,
                        struct module *mod)
{
      return 0;
}

int apply_relocate(Elf32_Shdr *sechdrs,
               const char *strtab,
               unsigned int symindex,
               unsigned int relsec,
               struct module *me)
{
      printk(KERN_ERR "module %s: REL relocation unsupported\n", me->name);
      return -ENOEXEC;
}

int apply_relocate_add(Elf32_Shdr *sechdrs,
                   const char *strtab,
                   unsigned int symindex,
                   unsigned int relsec,
                   struct module *me)
{
      unsigned int i;
      Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr;

      DEBUGP ("Applying add relocate section %u to %u\n", relsec,
            sechdrs[relsec].sh_info);

      for (i = 0; i < sechdrs[relsec].sh_size / sizeof (*rela); i++) {
            /* This is where to make the change */
            uint32_t *loc
                  = ((void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
                     + rela[i].r_offset);
            /* This is the symbol it is referring to.  Note that all
               undefined symbols have been resolved.  */
            Elf32_Sym *sym
                  = ((Elf32_Sym *)sechdrs[symindex].sh_addr
                     + ELF32_R_SYM (rela[i].r_info));
            switch (ELF32_R_TYPE(rela[i].r_info)) {
            case R_CRIS_32:
                  *loc = sym->st_value + rela[i].r_addend;
                  break;
            case R_CRIS_32_PCREL:
                  *loc = sym->st_value - (unsigned)loc + rela[i].r_addend - 4;
                   break;
            default:
                  printk(KERN_ERR "module %s: Unknown relocation: %u\n",
                         me->name, ELF32_R_TYPE(rela[i].r_info));
                  return -ENOEXEC;
            }
      }

      return 0;
}

int module_finalize(const Elf_Ehdr *hdr,
                const Elf_Shdr *sechdrs,
                struct module *me)
{
      return 0;
}

void module_arch_cleanup(struct module *mod)
{
}

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