/* * a1a2-selectortramps-arm.s * OCMethodTrace * * https://github.com/omxcodec/OCMethodTrace.git * * Copyright (C) 2018 Michael Chen * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #if __arm__ #include #include .syntax unified .text .private_extern __a1a2_selectorTrampHead .private_extern __a1a2_firstSelectorTramp .private_extern __a1a2_selectorTrampEnd // Trampoline machinery assumes the trampolines are Thumb function pointers #if !__thumb2__ # error sorry #endif .thumb .thumb_func __a1a2_selectorTrampHead .thumb_func __a1a2_firstSelectorTramp .thumb_func __a1a2_selectorTrampEnd .align PAGE_MAX_SHIFT __a1a2_selectorTrampHead: // Trampoline's data is one page before the trampoline text. // Also correct PC bias of 4 bytes. // 1. selector sub r12, #PAGE_MAX_SIZE ldr r1, [r12, #-4] // selector -> _cmd // 2. msgSend mov r12, pc sub r12, #PAGE_MAX_SIZE ldr pc, [r12, #-12] // tail call msgSend // not reached nop // Align trampolines to 8 bytes .align 3 .macro TrampolineEntry mov r12, pc b __a1a2_selectorTrampHead .align 3 .endmacro .macro TrampolineEntryX16 TrampolineEntry TrampolineEntry TrampolineEntry TrampolineEntry TrampolineEntry TrampolineEntry TrampolineEntry TrampolineEntry TrampolineEntry TrampolineEntry TrampolineEntry TrampolineEntry TrampolineEntry TrampolineEntry TrampolineEntry TrampolineEntry .endmacro .macro TrampolineEntryX256 TrampolineEntryX16 TrampolineEntryX16 TrampolineEntryX16 TrampolineEntryX16 TrampolineEntryX16 TrampolineEntryX16 TrampolineEntryX16 TrampolineEntryX16 TrampolineEntryX16 TrampolineEntryX16 TrampolineEntryX16 TrampolineEntryX16 TrampolineEntryX16 TrampolineEntryX16 TrampolineEntryX16 TrampolineEntryX16 .endmacro .private_extern __a1a2_firstSelectorTramp __a1a2_firstSelectorTramp: // 2048-3 trampolines to fill 16K page TrampolineEntryX256 TrampolineEntryX256 TrampolineEntryX256 TrampolineEntryX256 TrampolineEntryX256 TrampolineEntryX256 TrampolineEntryX256 TrampolineEntryX16 TrampolineEntryX16 TrampolineEntryX16 TrampolineEntryX16 TrampolineEntryX16 TrampolineEntryX16 TrampolineEntryX16 TrampolineEntryX16 TrampolineEntryX16 TrampolineEntryX16 TrampolineEntryX16 TrampolineEntryX16 TrampolineEntryX16 TrampolineEntryX16 TrampolineEntryX16 TrampolineEntry TrampolineEntry TrampolineEntry TrampolineEntry TrampolineEntry TrampolineEntry TrampolineEntry TrampolineEntry TrampolineEntry TrampolineEntry TrampolineEntry TrampolineEntry TrampolineEntry // TrampolineEntry // TrampolineEntry // TrampolineEntry .private_extern __a1a2_selectorTrampEnd __a1a2_selectorTrampEnd: #endif