1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2005 Peter Grehan.
5 * Copyright 1996-1998 John D. Polstra.
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 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * $FreeBSD$
30 */
31
32#include <sys/types.h>
33#include <machine/elf.h>
34
35#include <err.h>
36#include <errno.h>
37#include <inttypes.h>
38#include <string.h>
39
40#include "ef.h"
41
42#ifdef __powerpc64__
43#define PRI_ELF_SIZE PRIu64
44#else
45#define PRI_ELF_SIZE PRIu32
46#endif
47
48/*
49 * Apply relocations to the values obtained from the file. `relbase' is the
50 * target relocation address of the section, and `dataoff/len' is the region
51 * that is to be relocated, and has been copied to *dest
52 */
53int
54ef_reloc(struct elf_file *ef, const void *reldata, int reltype, Elf_Off relbase,
55    Elf_Off dataoff, size_t len, void *dest)
56{
57	Elf_Addr *where, addend;
58	Elf_Size rtype;
59	const Elf_Rela *rela;
60
61	if (reltype != EF_RELOC_RELA)
62		return (EINVAL);
63
64	rela = (const Elf_Rela *)reldata;
65	where = (Elf_Addr *) ((Elf_Off)dest - dataoff + rela->r_offset);
66	addend = rela->r_addend;
67	rtype = ELF_R_TYPE(rela->r_info);
68
69	if ((char *)where < (char *)dest || (char *)where >= (char *)dest + len)
70		return (0);
71
72	switch (rtype) {
73	case R_PPC_RELATIVE: /* word32|doubleword64 B + A */
74		*where = relbase + addend;
75		break;
76	default:
77		warnx("unhandled relocation type %" PRI_ELF_SIZE, rtype);
78	}
79	return (0);
80}
81