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 */ 31 enum 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