1// SPDX-License-Identifier: BSD-3-Clause
2/*
3 * reloc_ia32.c - position independent x86 ELF shared object relocator
4 * Copyright (C) 1999 Hewlett-Packard Co.
5 * Contributed by David Mosberger <davidm@hpl.hp.com>.
6 *
7 * All rights reserved.
8 */
9
10#include <common.h>
11#include <efi.h>
12#include <elf.h>
13
14efi_status_t EFIAPI _relocate(long ldbase, Elf32_Dyn *dyn)
15{
16	long relsz = 0, relent = 0;
17	Elf32_Rel *rel = 0;
18	unsigned long *addr;
19	int i;
20
21	for (i = 0; dyn[i].d_tag != DT_NULL; ++i) {
22		switch (dyn[i].d_tag) {
23		case DT_REL:
24			rel = (Elf32_Rel *)((unsigned long)dyn[i].d_un.d_ptr +
25								ldbase);
26			break;
27
28		case DT_RELSZ:
29			relsz = dyn[i].d_un.d_val;
30			break;
31
32		case DT_RELENT:
33			relent = dyn[i].d_un.d_val;
34			break;
35
36		case DT_RELA:
37			break;
38
39		default:
40			break;
41		}
42	}
43
44	if (!rel && relent == 0)
45		return EFI_SUCCESS;
46
47	if (!rel || relent == 0)
48		return EFI_LOAD_ERROR;
49
50	while (relsz > 0) {
51		/* apply the relocs */
52		switch (ELF32_R_TYPE(rel->r_info)) {
53		case R_386_NONE:
54			break;
55
56		case R_386_RELATIVE:
57			addr = (unsigned long *)(ldbase + rel->r_offset);
58			*addr += ldbase;
59			break;
60
61		default:
62			break;
63		}
64		rel = (Elf32_Rel *)((char *)rel + relent);
65		relsz -= relent;
66	}
67
68	return EFI_SUCCESS;
69}
70