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 <string.h>
38
39 #include "ef.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 */
46 int
ef_reloc(struct elf_file * ef,const void * reldata,int reltype,Elf_Off relbase,Elf_Off dataoff,size_t len,void * dest)47 ef_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;
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
62 if ((char *)where < (char *)dest || (char *)where >= (char *)dest + len)
63 return (0);
64
65 switch (rtype) {
66 case R_PPC_RELATIVE: /* word32 B + A */
67 *where = relbase + addend;
68 break;
69 default:
70 warnx("unhandled relocation type %u", rtype);
71 }
72 return (0);
73 }
74