1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
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
30#include <sys/endian.h>
31
32#include <err.h>
33#include <errno.h>
34#include <gelf.h>
35
36#include "ef.h"
37
38/*
39 * Apply relocations to the values obtained from the file. `relbase' is the
40 * target relocation address of the section, and `dataoff/len' is the region
41 * that is to be relocated, and has been copied to *dest
42 */
43static int
44ef_ppc_reloc(struct elf_file *ef, const void *reldata, Elf_Type reltype,
45    GElf_Addr relbase, GElf_Addr dataoff, size_t len, void *dest)
46{
47	char *where;
48	GElf_Addr addr, addend;
49	GElf_Size rtype, symidx;
50	const GElf_Rela *rela;
51
52	switch (reltype) {
53	case ELF_T_RELA:
54		rela = (const GElf_Rela *)reldata;
55		where = (char *)dest + (relbase + rela->r_offset - dataoff);
56		addend = rela->r_addend;
57		rtype = GELF_R_TYPE(rela->r_info);
58		symidx = GELF_R_SYM(rela->r_info);
59		break;
60	default:
61		return (EINVAL);
62	}
63
64	if (where < (char *)dest || where >= (char *)dest + len)
65		return (0);
66
67	switch (rtype) {
68	case R_PPC_RELATIVE: /* word32|doubleword64 B + A */
69		addr = relbase + addend;
70		if (elf_class(ef) == ELFCLASS64) {
71			if (elf_encoding(ef) == ELFDATA2LSB)
72				le64enc(where, addr);
73			else
74				be64enc(where, addr);
75		} else
76			be32enc(where, addr);
77		break;
78	case R_PPC_ADDR32:	/* word32 S + A */
79		addr = EF_SYMADDR(ef, symidx) + addend;
80		be32enc(where, addr);
81		break;
82	case R_PPC64_ADDR64:	/* doubleword64 S + A */
83		addr = EF_SYMADDR(ef, symidx) + addend;
84		if (elf_encoding(ef) == ELFDATA2LSB)
85			le64enc(where, addr);
86		else
87			be64enc(where, addr);
88		break;
89	default:
90		warnx("unhandled relocation type %d", (int)rtype);
91	}
92	return (0);
93}
94
95ELF_RELOC(ELFCLASS32, ELFDATA2MSB, EM_PPC, ef_ppc_reloc);
96ELF_RELOC(ELFCLASS64, ELFDATA2LSB, EM_PPC64, ef_ppc_reloc);
97ELF_RELOC(ELFCLASS64, ELFDATA2MSB, EM_PPC64, ef_ppc_reloc);
98