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/elf.h>
  20#include <linux/moduleloader.h>
  21#include <linux/err.h>
  22#include <linux/vmalloc.h>
  23#include <linux/bug.h>
  24#include <asm/module.h>
  25#include <asm/uaccess.h>
  26#include <asm/firmware.h>
  27#include <linux/sort.h>
  28
  29#include "setup.h"
  30
  31LIST_HEAD(module_bug_list);
  32
  33static const Elf_Shdr *find_section(const Elf_Ehdr *hdr,
  34                                    const Elf_Shdr *sechdrs,
  35                                    const char *name)
  36{
  37        char *secstrings;
  38        unsigned int i;
  39
  40        secstrings = (char *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
  41        for (i = 1; i < hdr->e_shnum; i++)
  42                if (strcmp(secstrings+sechdrs[i].sh_name, name) == 0)
  43                        return &sechdrs[i];
  44        return NULL;
  45}
  46
  47int module_finalize(const Elf_Ehdr *hdr,
  48                const Elf_Shdr *sechdrs, struct module *me)
  49{
  50        const Elf_Shdr *sect;
  51
  52        /* Apply feature fixups */
  53        sect = find_section(hdr, sechdrs, "__ftr_fixup");
  54        if (sect != NULL)
  55                do_feature_fixups(cur_cpu_spec->cpu_features,
  56                                  (void *)sect->sh_addr,
  57                                  (void *)sect->sh_addr + sect->sh_size);
  58
  59        sect = find_section(hdr, sechdrs, "__mmu_ftr_fixup");
  60        if (sect != NULL)
  61                do_feature_fixups(cur_cpu_spec->mmu_features,
  62                                  (void *)sect->sh_addr,
  63                                  (void *)sect->sh_addr + sect->sh_size);
  64
  65#ifdef CONFIG_PPC64
  66        sect = find_section(hdr, sechdrs, "__fw_ftr_fixup");
  67        if (sect != NULL)
  68                do_feature_fixups(powerpc_firmware_features,
  69                                  (void *)sect->sh_addr,
  70                                  (void *)sect->sh_addr + sect->sh_size);
  71#endif
  72
  73        sect = find_section(hdr, sechdrs, "__lwsync_fixup");
  74        if (sect != NULL)
  75                do_lwsync_fixups(cur_cpu_spec->cpu_features,
  76                                 (void *)sect->sh_addr,
  77                                 (void *)sect->sh_addr + sect->sh_size);
  78
  79        return 0;
  80}
  81