1/*-
2 * Copyright (c) 2005 Peter Grehan.
3 * Copyright 1996-1998 John D. Polstra.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 *
27 * $FreeBSD$
28 */
29
30#include <sys/types.h>
31#include <machine/elf.h>
32
33#include <err.h>
34#include <errno.h>
35#include <string.h>
36
37#include "ef.h"
38
39#include <stdio.h>
40
41/*
42 * Apply relocations to the values obtained from the file. `relbase' is the
43 * target relocation address of the section, and `dataoff/len' is the region
44 * that is to be relocated, and has been copied to *dest
45 */
46int
47ef_reloc(struct elf_file *ef, const void *reldata, int reltype, Elf_Off relbase,
48    Elf_Off dataoff, size_t len, void *dest)
49{
50        Elf_Addr *where, addend;
51        Elf_Size rtype, symidx;
52        const Elf_Rela *rela;
53
54	if (reltype != EF_RELOC_RELA)
55		return (EINVAL);
56
57	rela = (const Elf_Rela *)reldata;
58	where = (Elf_Addr *) ((Elf_Off)dest - dataoff + rela->r_offset);
59	addend = rela->r_addend;
60	rtype = ELF_R_TYPE(rela->r_info);
61	symidx = ELF_R_SYM(rela->r_info);
62
63	 if ((char *)where < (char *)dest || (char *)where >= (char *)dest + len)
64                return (0);
65
66	switch(rtype) {
67	case R_PPC_RELATIVE: /* word32 B + A */
68		*where = relbase + addend;
69		break;
70	default:
71		warnx("unhandled relocation type %d", rtype);
72	}
73	return (0);
74}
75