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https://github.com/DKJone/DKWechatHelper.git
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167 lines
3.3 KiB
ArmAsm
167 lines
3.3 KiB
ArmAsm
/*
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* a2a3-selectortramps-arm.s
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* OCMethodTrace
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*
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* https://github.com/omxcodec/OCMethodTrace.git
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*
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* Copyright (C) 2018 Michael Chen <omxcodec@gmail.com>
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#if __arm__
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#include <arm/arch.h>
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#include <mach/vm_param.h>
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.syntax unified
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.text
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.private_extern __a2a3_selectorTrampHead
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.private_extern __a2a3_firstSelectorTramp
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.private_extern __a2a3_selectorTrampEnd
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// Trampoline machinery assumes the trampolines are Thumb function pointers
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#if !__thumb2__
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# error sorry
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#endif
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.thumb
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.thumb_func __a2a3_selectorTrampHead
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.thumb_func __a2a3_firstSelectorTramp
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.thumb_func __a2a3_selectorTrampEnd
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.align PAGE_MAX_SHIFT
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__a2a3_selectorTrampHead:
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// Trampoline's data is one page before the trampoline text.
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// Also correct PC bias of 4 bytes.
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// 1. selector
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sub r12, #PAGE_MAX_SIZE
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ldr r2, [r12, #-4] // _cmd = selector
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// 2. msgSend. Can't "ldr r12, msgSend", error: out of range pc-relative fixup value
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mov r12, pc
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sub r12, #PAGE_MAX_SIZE
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ldr pc, [r12, #-12]
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// not reached
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nop
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// Align trampolines to 8 bytes
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.align 3
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.macro TrampolineEntry
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mov r12, pc
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b __a2a3_selectorTrampHead
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.align 3
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.endmacro
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.macro TrampolineEntryX16
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TrampolineEntry
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TrampolineEntry
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TrampolineEntry
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TrampolineEntry
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TrampolineEntry
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TrampolineEntry
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TrampolineEntry
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TrampolineEntry
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TrampolineEntry
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TrampolineEntry
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TrampolineEntry
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TrampolineEntry
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TrampolineEntry
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TrampolineEntry
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TrampolineEntry
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TrampolineEntry
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.endmacro
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.macro TrampolineEntryX256
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TrampolineEntryX16
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TrampolineEntryX16
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TrampolineEntryX16
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TrampolineEntryX16
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TrampolineEntryX16
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TrampolineEntryX16
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TrampolineEntryX16
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TrampolineEntryX16
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TrampolineEntryX16
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TrampolineEntryX16
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TrampolineEntryX16
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TrampolineEntryX16
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TrampolineEntryX16
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TrampolineEntryX16
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TrampolineEntryX16
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TrampolineEntryX16
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.endmacro
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.private_extern __a2a3_firstSelectorTramp
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__a2a3_firstSelectorTramp:
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// 2048-2 trampolines to fill 16K page
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TrampolineEntryX256
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TrampolineEntryX256
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TrampolineEntryX256
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TrampolineEntryX256
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TrampolineEntryX256
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TrampolineEntryX256
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TrampolineEntryX256
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TrampolineEntryX16
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TrampolineEntryX16
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TrampolineEntryX16
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TrampolineEntryX16
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TrampolineEntryX16
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TrampolineEntryX16
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TrampolineEntryX16
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TrampolineEntryX16
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TrampolineEntryX16
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TrampolineEntryX16
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TrampolineEntryX16
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TrampolineEntryX16
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TrampolineEntryX16
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TrampolineEntryX16
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TrampolineEntryX16
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TrampolineEntry
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TrampolineEntry
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TrampolineEntry
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TrampolineEntry
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TrampolineEntry
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TrampolineEntry
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TrampolineEntry
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TrampolineEntry
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TrampolineEntry
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TrampolineEntry
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TrampolineEntry
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TrampolineEntry
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TrampolineEntry
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// TrampolineEntry
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// TrampolineEntry
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// TrampolineEntry
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.private_extern __a2a3_selectorTrampEnd
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__a2a3_selectorTrampEnd:
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#endif
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