1 /* reloc_aarch64.c - position independent x86 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 
6     All rights reserved.
7 
8     Redistribution and use in source and binary forms, with or without
9     modification, are permitted provided that the following conditions
10     are met:
11 
12     * Redistributions of source code must retain the above copyright
13       notice, this list of conditions and the following disclaimer.
14     * Redistributions in binary form must reproduce the above
15       copyright notice, this list of conditions and the following
16       disclaimer in the documentation and/or other materials
17       provided with the distribution.
18     * Neither the name of Hewlett-Packard Co. nor the names of its
19       contributors may be used to endorse or promote products derived
20       from this software without specific prior written permission.
21 
22     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
23     CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
24     INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25     MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
27     BE LIABLE FOR ANYDIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
28     OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
29     PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
30     PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
31     THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
32     TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
33     THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34     SUCH DAMAGE.
35 */
36 
37 #include <efi.h>
38 
39 #include <elf.h>
40 
41 efi_status_t _relocate(long ldbase, Elf64_Dyn *dyn, efi_handle_t image,
42 		       struct efi_system_table *systab)
43 {
44 	long relsz = 0, relent = 0;
45 	Elf64_Rela *rel = 0;
46 	unsigned long *addr;
47 	int i;
48 
49 	for (i = 0; dyn[i].d_tag != DT_NULL; ++i) {
50 		switch (dyn[i].d_tag) {
51 		case DT_RELA:
52 			rel = (Elf64_Rela *)((ulong)dyn[i].d_un.d_ptr + ldbase);
53 			break;
54 		case DT_RELASZ:
55 			relsz = dyn[i].d_un.d_val;
56 			break;
57 		case DT_RELAENT:
58 			relent = dyn[i].d_un.d_val;
59 			break;
60 		default:
61 			break;
62 		}
63 	}
64 
65 	if (!rel && relent == 0)
66 		return EFI_SUCCESS;
67 
68 	if (!rel || relent == 0)
69 		return EFI_LOAD_ERROR;
70 
71 	while (relsz > 0) {
72 		/* apply the relocs */
73 		switch (ELF64_R_TYPE(rel->r_info)) {
74 		case R_AARCH64_NONE:
75 			break;
76 		case R_AARCH64_RELATIVE:
77 			addr = (ulong *)(ldbase + rel->r_offset);
78 			*addr = ldbase + rel->r_addend;
79 			break;
80 		default:
81 			break;
82 		}
83 		rel = (Elf64_Rela *)((char *)rel + relent);
84 		relsz -= relent;
85 	}
86 	return EFI_SUCCESS;
87 }
88