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
  30 LIST_HEAD(module_bug_list);
  31
  32 static 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
  46 int module_finalize(const Elf_Ehdr *hdr,
  47                 const Elf_Shdr *sechdrs, struct module *me)
  48 {
  49         const Elf_Shdr *sect;
  50
  51         /* Apply feature fixups */
  52         sect = find_section(hdr, sechdrs, "__ftr_fixup");
  53         if (sect != NULL)
  54                 do_feature_fixups(cur_cpu_spec->cpu_features,
  55                                   (void *)sect->sh_addr,
  56                                   (void *)sect->sh_addr + sect->sh_size);
  57
  58         sect = find_section(hdr, sechdrs, "__mmu_ftr_fixup");
  59         if (sect != NULL)
  60                 do_feature_fixups(cur_cpu_spec->mmu_features,
  61                                   (void *)sect->sh_addr,
  62                                   (void *)sect->sh_addr + sect->sh_size);
  63
  64 #ifdef CONFIG_PPC64
  65         sect = find_section(hdr, sechdrs, "__fw_ftr_fixup");
  66         if (sect != NULL)
  67                 do_feature_fixups(powerpc_firmware_features,
  68                                   (void *)sect->sh_addr,
  69                                   (void *)sect->sh_addr + sect->sh_size);
  70 #endif
  71
  72         sect = find_section(hdr, sechdrs, "__lwsync_fixup");
  73         if (sect != NULL)
  74                 do_lwsync_fixups(cur_cpu_spec->cpu_features,
  75                                  (void *)sect->sh_addr,
  76                                  (void *)sect->sh_addr + sect->sh_size);
  77
  78         return 0;
  79 }