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module.c

/*
 * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
 * Copyright (C) 2007-2009 PetaLogix
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/moduleloader.h>
#include <linux/kernel.h>
#include <linux/elf.h>
#include <linux/vmalloc.h>
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/string.h>

#include <asm/pgtable.h>

void *module_alloc(unsigned long size)
{
      void *ret;
      ret = (size == 0) ? NULL : vmalloc(size);
      pr_debug("module_alloc (%08lx@%08lx)\n", size, (unsigned long int)ret);
      return ret;
}

void module_free(struct module *module, void *region)
{
      pr_debug("module_free(%s,%08lx)\n", module->name,
                              (unsigned long)region);
      vfree(region);
}

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 *module)
{
      printk(KERN_ERR "module %s: ADD RELOCATION unsupported\n",
            module->name);
      return -ENOEXEC;
}

int apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab,
      unsigned int symindex, unsigned int relsec, struct module *module)
{

      unsigned int i;
      Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr;
      Elf32_Sym *sym;
      unsigned long int *location;
      unsigned long int value;
#if __GNUC__ < 4
      unsigned long int old_value;
#endif

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

      for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) {

            location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr +
                        rela[i].r_offset;
            sym = (Elf32_Sym *)sechdrs[symindex].sh_addr +
                  ELF32_R_SYM(rela[i].r_info);
            value = sym->st_value + rela[i].r_addend;

            switch (ELF32_R_TYPE(rela[i].r_info)) {

            /*
             * Be careful! mb-gcc / mb-ld splits the relocs between the
             * text and the reloc table. In general this means we must
             * read the current contents of (*location), add any offset
             * then store the result back in
             */

            case R_MICROBLAZE_32:
#if __GNUC__ < 4
                  old_value = *location;
                  *location = value + old_value;

                  pr_debug("R_MICROBLAZE_32 (%08lx->%08lx)\n",
                        old_value, value);
#else
                  *location = value;
#endif
                  break;

            case R_MICROBLAZE_64:
#if __GNUC__ < 4
                  /* Split relocs only required/used pre gcc4.1.1 */
                  old_value = ((location[0] & 0x0000FFFF) << 16) |
                              (location[1] & 0x0000FFFF);
                  value += old_value;
#endif
                  location[0] = (location[0] & 0xFFFF0000) |
                              (value >> 16);
                  location[1] = (location[1] & 0xFFFF0000) |
                              (value & 0xFFFF);
#if __GNUC__ < 4
                  pr_debug("R_MICROBLAZE_64 (%08lx->%08lx)\n",
                        old_value, value);
#endif
                  break;

            case R_MICROBLAZE_64_PCREL:
#if __GNUC__ < 4
                  old_value = (location[0] & 0xFFFF) << 16 |
                        (location[1] & 0xFFFF);
                  value -= old_value;
#endif
                  value -= (unsigned long int)(location) + 4;
                  location[0] = (location[0] & 0xFFFF0000) |
                              (value >> 16);
                  location[1] = (location[1] & 0xFFFF0000) |
                              (value & 0xFFFF);
                  pr_debug("R_MICROBLAZE_64_PCREL (%08lx)\n",
                        value);
                  break;

            case R_MICROBLAZE_32_PCREL_LO:
                  pr_debug("R_MICROBLAZE_32_PCREL_LO\n");
                  break;

            case R_MICROBLAZE_64_NONE:
                  pr_debug("R_MICROBLAZE_NONE\n");
                  break;

            case R_MICROBLAZE_NONE:
                  pr_debug("R_MICROBLAZE_NONE\n");
                  break;

            default:
                  printk(KERN_ERR "module %s: "
                        "Unknown relocation: %u\n",
                        module->name,
                        ELF32_R_TYPE(rela[i].r_info));
                  return -ENOEXEC;
            }
      }
      return 0;
}

int module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs,
            struct module *module)
{
      return 0;
}

void module_arch_cleanup(struct module *mod)
{
}

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