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 "kldelf.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 */
41 static int
ef_aarch64_reloc(struct elf_file * ef,const void * reldata,Elf_Type reltype,GElf_Addr relbase,GElf_Addr dataoff,size_t len,void * dest)42 ef_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
81 ELF_RELOC(ELFCLASS64, ELFDATA2LSB, EM_AARCH64, ef_aarch64_reloc);
82