61 lines
2.7 KiB
C
61 lines
2.7 KiB
C
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/*
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* Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
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*
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* @APPLE_LICENSE_HEADER_START@
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this
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* file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_LICENSE_HEADER_END@
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*/
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/*
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* Relocation types used in the arm implementation. Relocation entries for
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* things other than instructions use the same generic relocation as discribed
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* in <mach-o/reloc.h> and their r_type is ARM_RELOC_VANILLA, one of the
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* *_SECTDIFF or the *_PB_LA_PTR types. The rest of the relocation types are
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* for instructions. Since they are for instructions the r_address field
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* indicates the 32 bit instruction that the relocation is to be preformed on.
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*/
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enum reloc_type_arm
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{
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ARM_RELOC_VANILLA, /* generic relocation as discribed above */
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ARM_RELOC_PAIR, /* the second relocation entry of a pair */
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ARM_RELOC_SECTDIFF, /* a PAIR follows with subtract symbol value */
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ARM_RELOC_LOCAL_SECTDIFF, /* like ARM_RELOC_SECTDIFF, but the symbol
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referenced was local. */
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ARM_RELOC_PB_LA_PTR,/* prebound lazy pointer */
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ARM_RELOC_BR24, /* 24 bit branch displacement (to a word address) */
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ARM_THUMB_RELOC_BR22, /* 22 bit branch displacement (to a half-word
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address) */
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ARM_THUMB_32BIT_BRANCH, /* obsolete - a thumb 32-bit branch instruction
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possibly needing page-spanning branch workaround */
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/*
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* For these two r_type relocations they always have a pair following them
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* and the r_length bits are used differently. The encoding of the
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* r_length is as follows:
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* low bit of r_length:
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* 0 - :lower16: for movw instructions
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* 1 - :upper16: for movt instructions
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* high bit of r_length:
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* 0 - arm instructions
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* 1 - thumb instructions
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* the other half of the relocated expression is in the following pair
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* relocation entry in the the low 16 bits of r_address field.
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*/
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ARM_RELOC_HALF,
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ARM_RELOC_HALF_SECTDIFF
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};
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