1/*
2 * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
3 *
4 * @APPLE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. Please obtain a copy of the License at
10 * http://www.opensource.apple.com/apsl/ and read it before using this
11 * file.
12 *
13 * The Original Code and all software distributed under the License are
14 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
15 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
16 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
18 * Please see the License for the specific language governing rights and
19 * limitations under the License.
20 *
21 * @APPLE_LICENSE_HEADER_END@
22 */
23
24#ifndef _MACHO_ARM_RELOC_H_
25#define _MACHO_ARM_RELOC_H_
26
27/*
28 * Relocation types used in the arm implementation. Relocation entries for
29 * things other than instructions use the same generic relocation as discribed
30 * in <mach-o/reloc.h> and their r_type is ARM_RELOC_VANILLA, one of the
31 * *_SECTDIFF or the *_PB_LA_PTR types. The rest of the relocation types are
32 * for instructions. Since they are for instructions the r_address field
33 * indicates the 32 bit instruction that the relocation is to be preformed on.
34 */
35
36enum reloc_type_arm
37{
38 ARM_RELOC_VANILLA, /* generic relocation as discribed above */
39 ARM_RELOC_PAIR, /* the second relocation entry of a pair */
40 ARM_RELOC_SECTDIFF, /* a PAIR follows with subtract symbol value */
41 ARM_RELOC_LOCAL_SECTDIFF, /* like ARM_RELOC_SECTDIFF, but the symbol
42 referenced was local. */
43 ARM_RELOC_PB_LA_PTR,/* prebound lazy pointer */
44 ARM_RELOC_BR24, /* 24 bit branch displacement (to a word address) */
45 ARM_THUMB_RELOC_BR22, /* 22 bit branch displacement (to a half-word
46 address) */
47 ARM_THUMB_32BIT_BRANCH, /* obsolete - a thumb 32-bit branch instruction
48 possibly needing page-spanning branch workaround */
49
50 /*
51 * For these two r_type relocations they always have a pair following them
52 * and the r_length bits are used differently. The encoding of the
53 * r_length is as follows:
54 * low bit of r_length:
55 * 0 - :lower16: for movw instructions
56 * 1 - :upper16: for movt instructions
57 * high bit of r_length:
58 * 0 - arm instructions
59 * 1 - thumb instructions
60 * the other half of the relocated expression is in the following pair
61 * relocation entry in the the low 16 bits of r_address field.
62 */
63 ARM_RELOC_HALF,
64 ARM_RELOC_HALF_SECTDIFF
65};
66
67#endif /* #ifndef _MACHO_ARM_RELOC_H_ */