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
28#include <sys/endian.h>
29
30#include <err.h>
31#include <errno.h>
32#include <gelf.h>
33
34#include "ef.h"
35
36/*
37 * Apply relocations to the values obtained from the file. `relbase' is the
38 * target relocation address of the section, and `dataoff/len' is the region
39 * that is to be relocated, and has been copied to *dest
40 */
41static int
42ef_aarch64_reloc(struct elf_file *ef, const void *reldata, Elf_Type reltype,
43    GElf_Addr relbase, GElf_Addr dataoff, size_t len, void *dest)
44{
45	char *where;
46	GElf_Addr addr, addend;
47	GElf_Size rtype, symidx;
48	const GElf_Rela *rela;
49
50	switch (reltype) {
51	case ELF_T_RELA:
52		rela = (const GElf_Rela *)reldata;
53		where = (char *)dest + (relbase + rela->r_offset - dataoff);
54		addend = rela->r_addend;
55		rtype = GELF_R_TYPE(rela->r_info);
56		symidx = GELF_R_SYM(rela->r_info);
57		break;
58	default:
59		return (EINVAL);
60	}
61
62	if (where < (char *)dest || where >= (char *)dest + len)
63		return (0);
64
65	switch (rtype) {
66	case R_AARCH64_RELATIVE:
67		addr = relbase + addend;
68		le64enc(where, addr);
69		break;
70	case R_AARCH64_ABS64:
71		addr = EF_SYMADDR(ef, symidx) + addend;
72		le64enc(where, addr);
73		break;
74	default:
75		warnx("unhandled relocation type %d", (int)rtype);
76		break;
77	}
78	return (0);
79}
80
81ELF_RELOC(ELFCLASS64, ELFDATA2LSB, EM_AARCH64, ef_aarch64_reloc);
82