]> git.sur5r.net Git - u-boot/blob - arch/arm/lib/reloc_arm_efi.c
Merge branch 'master' of git://git.denx.de/u-boot-video
[u-boot] / arch / arm / lib / reloc_arm_efi.c
1 /*
2  * reloc_arm.c - position-independent ARM ELF shared object relocator
3  *
4  * Copyright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org>
5  * Copyright (C) 1999 Hewlett-Packard Co.
6  * Contributed by David Mosberger <davidm@hpl.hp.com>.
7  *
8  * All rights reserved.
9  *
10  * SPDX-License-Identifier:     BSD-3-Clause
11  *
12  * This file is taken and modified from the gnu-efi project.
13  */
14
15 #include <efi.h>
16 #include <elf.h>
17
18 efi_status_t _relocate(long ldbase, Elf32_Dyn *dyn, efi_handle_t image,
19                        struct efi_system_table *systab)
20 {
21         long relsz = 0, relent = 0;
22         Elf32_Rel *rel = 0;
23         ulong *addr;
24         int i;
25
26         for (i = 0; dyn[i].d_tag != DT_NULL; ++i) {
27                 switch (dyn[i].d_tag) {
28                 case DT_REL:
29                         rel = (Elf32_Rel *)((ulong)dyn[i].d_un.d_ptr
30                                         + ldbase);
31                         break;
32                 case DT_RELSZ:
33                         relsz = dyn[i].d_un.d_val;
34                         break;
35                 case DT_RELENT:
36                         relent = dyn[i].d_un.d_val;
37                         break;
38                 default:
39                         break;
40                 }
41         }
42
43         if (!rel && relent == 0)
44                 return EFI_SUCCESS;
45
46         if (!rel || relent == 0)
47                 return EFI_LOAD_ERROR;
48
49         while (relsz > 0) {
50                 /* apply the relocs */
51                 switch (ELF32_R_TYPE(rel->r_info)) {
52                 case R_ARM_NONE:
53                         break;
54                 case R_ARM_RELATIVE:
55                         addr = (ulong *)(ldbase + rel->r_offset);
56                         *addr += ldbase;
57                         break;
58                 default:
59                         break;
60                 }
61                 rel = (Elf32_Rel *)((char *)rel + relent);
62                 relsz -= relent;
63         }
64
65         return EFI_SUCCESS;
66 }