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module.c

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive
 * for more details.
 */

#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_MODULES

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


/* Free memory returned from module_alloc */
void module_free(struct module *mod, void *module_region)
{
      vfree(module_region);
      /* FIXME: If module_region == mod->init_region, trim exception
           table entries. */
}

/* 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)
{
      unsigned int i;
      Elf32_Rel *rel = (void *)sechdrs[relsec].sh_addr;
      Elf32_Sym *sym;
      uint32_t *location;

      DEBUGP("Applying relocate section %u to %u\n", relsec,
             sechdrs[relsec].sh_info);
      for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
            /* This is where to make the change */
            location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
                  + rel[i].r_offset;
            /* This is the symbol it is referring to.  Note that all
               undefined symbols have been resolved.  */
            sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
                  + ELF32_R_SYM(rel[i].r_info);

            switch (ELF32_R_TYPE(rel[i].r_info)) {
            case R_68K_32:
                  /* We add the value into the location given */
                  *location += sym->st_value;
                  break;
            case R_68K_PC32:
                  /* Add the value, subtract its postition */
                  *location += sym->st_value - (uint32_t)location;
                  break;
            default:
                  printk(KERN_ERR "module %s: Unknown relocation: %u\n",
                         me->name, ELF32_R_TYPE(rel[i].r_info));
                  return -ENOEXEC;
            }
      }
      return 0;
}

int apply_relocate_add(Elf32_Shdr *sechdrs,
                   const char *strtab,
                   unsigned int symindex,
                   unsigned int relsec,
                   struct module *me)
{
      unsigned int i;
      Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr;
      Elf32_Sym *sym;
      uint32_t *location;

      DEBUGP("Applying relocate_add section %u to %u\n", relsec,
             sechdrs[relsec].sh_info);
      for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
            /* This is where to make the change */
            location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
                  + rel[i].r_offset;
            /* This is the symbol it is referring to.  Note that all
               undefined symbols have been resolved.  */
            sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
                  + ELF32_R_SYM(rel[i].r_info);

            switch (ELF32_R_TYPE(rel[i].r_info)) {
            case R_68K_32:
                  /* We add the value into the location given */
                  *location = rel[i].r_addend + sym->st_value;
                  break;
            case R_68K_PC32:
                  /* Add the value, subtract its postition */
                  *location = rel[i].r_addend + sym->st_value - (uint32_t)location;
                  break;
            default:
                  printk(KERN_ERR "module %s: Unknown relocation: %u\n",
                         me->name, ELF32_R_TYPE(rel[i].r_info));
                  return -ENOEXEC;
            }
      }
      return 0;
}

int module_finalize(const Elf_Ehdr *hdr,
                const Elf_Shdr *sechdrs,
                struct module *mod)
{
      module_fixup(mod, mod->arch.fixup_start, mod->arch.fixup_end);

      return 0;
}

void module_arch_cleanup(struct module *mod)
{
}

#endif /* CONFIG_MODULES */

void module_fixup(struct module *mod, struct m68k_fixup_info *start,
              struct m68k_fixup_info *end)
{
      struct m68k_fixup_info *fixup;

      for (fixup = start; fixup < end; fixup++) {
            switch (fixup->type) {
            case m68k_fixup_memoffset:
                  *(u32 *)fixup->addr = m68k_memoffset;
                  break;
            case m68k_fixup_vnode_shift:
                  *(u16 *)fixup->addr += m68k_virt_to_node_shift;
                  break;
            }
      }
}

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