LXR linux/arch/powerpc/kernel/module.c

   1/*  Kernel module help for powerpc.
   2    Copyright (C) 2001, 2003 Rusty Russell IBM Corporation.
   3    Copyright (C) 2008 Freescale Semiconductor, Inc.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 2 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program; if not, write to the Free Software
  17    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18*/
  19#include <linux/module.h>
  20#include <linux/elf.h>
  21#include <linux/moduleloader.h>
  22#include <linux/err.h>
  23#include <linux/vmalloc.h>
  24#include <linux/bug.h>
  25#include <asm/module.h>
  26#include <asm/uaccess.h>
  27#include <asm/firmware.h>
  28#include <linux/sort.h>
  29
  30#include "setup.h"
  31
  32LIST_HEAD(module_bug_list);
  33
  34void *module_alloc(unsigned long size)
  35{
  36        if (size == 0)
  37                return NULL;
  38
  39        return vmalloc_exec(size);
  40}
  41
  42/* Free memory returned from module_alloc */
  43void module_free(struct module *mod, void *module_region)
  44{
  45        vfree(module_region);
  46}
  47
  48static const Elf_Shdr *find_section(const Elf_Ehdr *hdr,
  49                                    const Elf_Shdr *sechdrs,
  50                                    const char *name)
  51{
  52        char *secstrings;
  53        unsigned int i;
  54
  55        secstrings = (char *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
  56        for (i = 1; i < hdr->e_shnum; i++)
  57                if (strcmp(secstrings+sechdrs[i].sh_name, name) == 0)
  58                        return &sechdrs[i];
  59        return NULL;
  60}
  61
  62int module_finalize(const Elf_Ehdr *hdr,
  63                const Elf_Shdr *sechdrs, struct module *me)
  64{
  65        const Elf_Shdr *sect;
  66        int err;
  67
  68        err = module_bug_finalize(hdr, sechdrs, me);
  69        if (err)
  70                return err;
  71
  72        /* Apply feature fixups */
  73        sect = find_section(hdr, sechdrs, "__ftr_fixup");
  74        if (sect != NULL)
  75                do_feature_fixups(cur_cpu_spec->cpu_features,
  76                                  (void *)sect->sh_addr,
  77                                  (void *)sect->sh_addr + sect->sh_size);
  78
  79        sect = find_section(hdr, sechdrs, "__mmu_ftr_fixup");
  80        if (sect != NULL)
  81                do_feature_fixups(cur_cpu_spec->mmu_features,
  82                                  (void *)sect->sh_addr,
  83                                  (void *)sect->sh_addr + sect->sh_size);
  84
  85#ifdef CONFIG_PPC64
  86        sect = find_section(hdr, sechdrs, "__fw_ftr_fixup");
  87        if (sect != NULL)
  88                do_feature_fixups(powerpc_firmware_features,
  89                                  (void *)sect->sh_addr,
  90                                  (void *)sect->sh_addr + sect->sh_size);
  91#endif
  92
  93        sect = find_section(hdr, sechdrs, "__lwsync_fixup");
  94        if (sect != NULL)
  95                do_lwsync_fixups(cur_cpu_spec->cpu_features,
  96                                 (void *)sect->sh_addr,
  97                                 (void *)sect->sh_addr + sect->sh_size);
  98
  99        return 0;
 100}
 101
 102void module_arch_cleanup(struct module *mod)
 103{
 104        module_bug_cleanup(mod);
 105}
 106