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 static 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         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 }