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 * Relocation types used in the arm implementation.  Relocation entries for
25 * things other than instructions use the same generic relocation as discribed
26 * in <mach-o/reloc.h> and their r_type is ARM_RELOC_VANILLA, one of the
27 * *_SECTDIFF or the *_PB_LA_PTR types.  The rest of the relocation types are
28 * for instructions.  Since they are for instructions the r_address field
29 * indicates the 32 bit instruction that the relocation is to be preformed on.
30 */
31enum reloc_type_arm
32{
33    ARM_RELOC_VANILLA,	/* generic relocation as discribed above */
34    ARM_RELOC_PAIR,	/* the second relocation entry of a pair */
35    ARM_RELOC_SECTDIFF,	/* a PAIR follows with subtract symbol value */
36    ARM_RELOC_LOCAL_SECTDIFF, /* like ARM_RELOC_SECTDIFF, but the symbol
37				 referenced was local.  */
38    ARM_RELOC_PB_LA_PTR,/* prebound lazy pointer */
39    ARM_RELOC_BR24,	/* 24 bit branch displacement (to a word address) */
40    ARM_THUMB_RELOC_BR22, /* 22 bit branch displacement (to a half-word
41			     address) */
42    ARM_THUMB_32BIT_BRANCH, /* obsolete - a thumb 32-bit branch instruction
43			     possibly needing page-spanning branch workaround */
44
45    /*
46     * For these two r_type relocations they always have a pair following them
47     * and the r_length bits are used differently.  The encoding of the
48     * r_length is as follows:
49     * low bit of r_length:
50     *  0 - :lower16: for movw instructions
51     *  1 - :upper16: for movt instructions
52     * high bit of r_length:
53     *  0 - arm instructions
54     *  1 - thumb instructions
55     * the other half of the relocated expression is in the following pair
56     * relocation entry in the the low 16 bits of r_address field.
57     */
58    ARM_RELOC_HALF,
59    ARM_RELOC_HALF_SECTDIFF
60};
61