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module.c

/*  Kernel module help for powerpc.
    Copyright (C) 2001, 2003 Rusty Russell IBM Corporation.
    Copyright (C) 2008 Freescale Semiconductor, Inc.

    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/module.h>
#include <linux/elf.h>
#include <linux/moduleloader.h>
#include <linux/err.h>
#include <linux/vmalloc.h>
#include <linux/bug.h>
#include <asm/module.h>
#include <asm/uaccess.h>
#include <asm/firmware.h>
#include <linux/sort.h>

#include "setup.h"

LIST_HEAD(module_bug_list);

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

      return vmalloc_exec(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. */
}

static const Elf_Shdr *find_section(const Elf_Ehdr *hdr,
                            const Elf_Shdr *sechdrs,
                            const char *name)
{
      char *secstrings;
      unsigned int i;

      secstrings = (char *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
      for (i = 1; i < hdr->e_shnum; i++)
            if (strcmp(secstrings+sechdrs[i].sh_name, name) == 0)
                  return &sechdrs[i];
      return NULL;
}

int module_finalize(const Elf_Ehdr *hdr,
            const Elf_Shdr *sechdrs, struct module *me)
{
      const Elf_Shdr *sect;
      int err;

      err = module_bug_finalize(hdr, sechdrs, me);
      if (err)
            return err;

      /* Apply feature fixups */
      sect = find_section(hdr, sechdrs, "__ftr_fixup");
      if (sect != NULL)
            do_feature_fixups(cur_cpu_spec->cpu_features,
                          (void *)sect->sh_addr,
                          (void *)sect->sh_addr + sect->sh_size);

#ifdef CONFIG_PPC64
      sect = find_section(hdr, sechdrs, "__fw_ftr_fixup");
      if (sect != NULL)
            do_feature_fixups(powerpc_firmware_features,
                          (void *)sect->sh_addr,
                          (void *)sect->sh_addr + sect->sh_size);
#endif

      sect = find_section(hdr, sechdrs, "__lwsync_fixup");
      if (sect != NULL)
            do_lwsync_fixups(cur_cpu_spec->cpu_features,
                         (void *)sect->sh_addr,
                         (void *)sect->sh_addr + sect->sh_size);

      return 0;
}

void module_arch_cleanup(struct module *mod)
{
      module_bug_cleanup(mod);
}

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