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
  31 LIST_HEAD(module_bug_list);
  32
  33 static 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
  47 int 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 }