gnuefi/reloc_mips64el.c

   1 /* reloc_mips64el.c - position independent MIPS64 ELF shared object relocator
   2    Copyright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org>
   3    Copyright (C) 1999 Hewlett-Packard Co.
   4         Contributed by David Mosberger <davidm@hpl.hp.com>.
   5    Copyright (C) 2017 Lemote Co.
   6         Contributed by Heiher <r@hev.cc>
   7
   8     All rights reserved.
   9
  10     Redistribution and use in source and binary forms, with or without
  11     modification, are permitted provided that the following conditions
  12     are met:
  13
  14     * Redistributions of source code must retain the above copyright
  15       notice, this list of conditions and the following disclaimer.
  16     * Redistributions in binary form must reproduce the above
  17       copyright notice, this list of conditions and the following
  18       disclaimer in the documentation and/or other materials
  19       provided with the distribution.
  20     * Neither the name of Hewlett-Packard Co. nor the names of its
  21       contributors may be used to endorse or promote products derived
  22       from this software without specific prior written permission.
  23
  24     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
  25     CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
  26     INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27     MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
  29     BE LIABLE FOR ANYDIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
  30     OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  31     PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  32     PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  33     THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
  34     TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
  35     THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36     SUCH DAMAGE.
  37 */
  38
  39 #include <efi.h>
  40 #include <efilib.h>
  41
  42 #include <elf.h>
  43
  44 EFI_STATUS _relocate (long ldbase, Elf64_Dyn *dyn,
  45                       EFI_HANDLE image EFI_UNUSED,
  46                       EFI_SYSTEM_TABLE *systab EFI_UNUSED)
  47 {
  48         long relsz = 0, relent = 0, gotsz = 0;
  49         Elf64_Rel *rel = 0;
  50         unsigned long *addr = 0;
  51         int i;
  52
  53         for (i = 0; dyn[i].d_tag != DT_NULL; ++i) {
  54                 switch (dyn[i].d_tag) {
  55                         case DT_REL:
  56                                 rel = (Elf64_Rel*)
  57                                         ((unsigned long)dyn[i].d_un.d_ptr
  58                                          + ldbase);
  59                                 break;
  60
  61                         case DT_RELSZ:
  62                                 relsz = dyn[i].d_un.d_val;
  63                                 break;
  64
  65                         case DT_RELENT:
  66                                 relent = dyn[i].d_un.d_val;
  67                                 break;
  68
  69                         case DT_PLTGOT:
  70                                 addr = (unsigned long *)
  71                                         ((unsigned long)dyn[i].d_un.d_ptr
  72                                          + ldbase);
  73                                 break;
  74
  75                         case DT_MIPS_LOCAL_GOTNO:
  76                                 gotsz = dyn[i].d_un.d_val;
  77                                 break;
  78
  79                         default:
  80                                 break;
  81                 }
  82         }
  83
  84         if ((!rel && relent == 0) && (!addr && gotsz == 0))
  85                 return EFI_SUCCESS;
  86
  87         if ((!rel && relent != 0) || (!addr && gotsz != 0))
  88                 return EFI_LOAD_ERROR;
  89
  90         while (gotsz > 0) {
  91                 *addr += ldbase;
  92                 addr += 1;
  93                 gotsz --;
  94         }
  95
  96         while (relsz > 0) {
  97                 /* apply the relocs */
  98                 switch (ELF64_R_TYPE (swap_uint64 (rel->r_info))) {
  99                         case R_MIPS_NONE:
 100                                 break;
 101
 102                         case (R_MIPS_64 << 8) | R_MIPS_REL32:
 103                                 addr = (unsigned long *)
 104                                         (ldbase + rel->r_offset);
 105                                 *addr += ldbase;
 106                                 break;
 107
 108                         default:
 109                                 break;
 110                 }
 111                 rel = (Elf64_Rel*) ((char *) rel + relent);
 112                 relsz -= relent;
 113         }
 114         return EFI_SUCCESS;
 115 }