| | 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 | }; |
projects / apple / xnu.git / blame_incremental