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#include <asm/setup.h>
  29
  30LIST_HEAD(module_bug_list);
  31
  32static const Elf_Shdr *find_section(const Elf_Ehdr *hdr,
  33                                    const Elf_Shdr *sechdrs,
  34                                    const char *name)
  35{
  36        char *secstrings;
  37        unsigned int i;
  38
  39        secstrings = (char *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
  40        for (i = 1; i < hdr->e_shnum; i++)
  41                if (strcmp(secstrings+sechdrs[i].sh_name, name) == 0)
  42                        return &sechdrs[i];
  43        return NULL;
  44}
  45
  46int module_finalize(const Elf_Ehdr *hdr,
  47                const Elf_Shdr *sechdrs, struct module *me)
  48{
  49        const Elf_Shdr *sect;
  50        int rc;
  51
  52        rc = module_finalize_ftrace(me, sechdrs);
  53        if (rc)
  54                return rc;
  55
  56        /* Apply feature fixups */
  57        sect = find_section(hdr, sechdrs, "__ftr_fixup");
  58        if (sect != NULL)
  59                do_feature_fixups(cur_cpu_spec->cpu_features,
  60                                  (void *)sect->sh_addr,
  61                                  (void *)sect->sh_addr + sect->sh_size);
  62
  63        sect = find_section(hdr, sechdrs, "__mmu_ftr_fixup");
  64        if (sect != NULL)
  65                do_feature_fixups(cur_cpu_spec->mmu_features,
  66                                  (void *)sect->sh_addr,
  67                                  (void *)sect->sh_addr + sect->sh_size);
  68
  69#ifdef CONFIG_PPC64
  70        sect = find_section(hdr, sechdrs, "__fw_ftr_fixup");
  71        if (sect != NULL)
  72                do_feature_fixups(powerpc_firmware_features,
  73                                  (void *)sect->sh_addr,
  74                                  (void *)sect->sh_addr + sect->sh_size);
  75#endif
  76
  77        sect = find_section(hdr, sechdrs, "__lwsync_fixup");
  78        if (sect != NULL)
  79                do_lwsync_fixups(cur_cpu_spec->cpu_features,
  80                                 (void *)sect->sh_addr,
  81                                 (void *)sect->sh_addr + sect->sh_size);
  82
  83        return 0;
  84}
  85