1/* reloc_x86_64.c - position independent x86_64 ELF shared object relocator
2   Copyright (C) 1999 Hewlett-Packard Co.
3	Contributed by David Mosberger <davidm@hpl.hp.com>.
4   Copyright (C) 2005 Intel Co.
5	Contributed by Fenghua Yu <fenghua.yu@intel.com>.
6
7    All rights reserved.
8
9    Redistribution and use in source and binary forms, with or without
10    modification, are permitted provided that the following conditions
11    are met:
12
13    * Redistributions of source code must retain the above copyright
14      notice, this list of conditions and the following disclaimer.
15    * Redistributions in binary form must reproduce the above
16      copyright notice, this list of conditions and the following
17      disclaimer in the documentation and/or other materials
18      provided with the distribution.
19    * Neither the name of Hewlett-Packard Co. nor the names of its
20      contributors may be used to endorse or promote products derived
21      from this software without specific prior written permission.
22
23    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
24    CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
25    INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
26    MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
27    DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
28    BE LIABLE FOR ANYDIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
29    OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
30    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
31    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
32    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
33    TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
34    THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35    SUCH DAMAGE.
36*/
37
38#include <efi.h>
39#include <efilib.h>
40
41#include <elf.h>
42
43EFI_STATUS _relocate (long ldbase, Elf64_Dyn *dyn, EFI_HANDLE image, EFI_SYSTEM_TABLE *systab)
44{
45	long relsz = 0, relent = 0;
46	Elf64_Rel *rel = 0;
47	unsigned long *addr;
48	int i;
49
50	for (i = 0; dyn[i].d_tag != DT_NULL; ++i) {
51		switch (dyn[i].d_tag) {
52			case DT_RELA:
53				rel = (Elf64_Rel*)
54					((unsigned long)dyn[i].d_un.d_ptr
55					 + ldbase);
56				break;
57
58			case DT_RELASZ:
59				relsz = dyn[i].d_un.d_val;
60				break;
61
62			case DT_RELAENT:
63				relent = dyn[i].d_un.d_val;
64				break;
65
66			default:
67				break;
68		}
69	}
70
71        if (!rel && relent == 0)
72                return EFI_SUCCESS;
73
74 	if (!rel || relent == 0)
75 		return EFI_LOAD_ERROR;
76
77	while (relsz > 0) {
78		/* apply the relocs */
79		switch (ELF64_R_TYPE (rel->r_info)) {
80			case R_X86_64_NONE:
81				break;
82
83			case R_X86_64_RELATIVE:
84				addr = (unsigned long *)
85					(ldbase + rel->r_offset);
86				*addr += ldbase;
87				break;
88
89			default:
90				break;
91		}
92		rel = (Elf64_Rel*) ((char *) rel + relent);
93		relsz -= relent;
94	}
95	return EFI_SUCCESS;
96}
97