68 lines
2.3 KiB
ArmAsm
68 lines
2.3 KiB
ArmAsm
/*
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* Copyright (C) 2016 The Android Open Source Project
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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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/*
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* Interpreter entry point.
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*/
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.text
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.align 2
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.global ExecuteMterpImpl
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.type ExecuteMterpImpl, %function
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/*
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* On entry:
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* r0 Thread* self/
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* r1 code_item
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* r2 ShadowFrame
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* r3 JValue* result_register
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*
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*/
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ExecuteMterpImpl:
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.fnstart
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.save {r3-r10,fp,lr}
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stmfd sp!, {r3-r10,fp,lr} @ save 10 regs, (r3 just to align 64)
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/* Remember the return register */
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str r3, [r2, #SHADOWFRAME_RESULT_REGISTER_OFFSET]
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/* Remember the code_item */
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str r1, [r2, #SHADOWFRAME_CODE_ITEM_OFFSET]
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/* set up "named" registers */
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mov rSELF, r0
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ldr r0, [r2, #SHADOWFRAME_NUMBER_OF_VREGS_OFFSET]
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add rFP, r2, #SHADOWFRAME_VREGS_OFFSET @ point to vregs.
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VREG_INDEX_TO_ADDR rREFS, r0 @ point to reference array in shadow frame
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ldr r0, [r2, #SHADOWFRAME_DEX_PC_OFFSET] @ Get starting dex_pc.
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add rPC, r1, #CODEITEM_INSNS_OFFSET @ Point to base of insns[]
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add rPC, rPC, r0, lsl #1 @ Create direct pointer to 1st dex opcode
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EXPORT_PC
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/* Starting ibase */
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ldr rIBASE, [rSELF, #THREAD_CURRENT_IBASE_OFFSET]
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/* Set up for backwards branches & osr profiling */
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ldr r0, [rFP, #OFF_FP_METHOD]
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add r1, rFP, #OFF_FP_SHADOWFRAME
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bl MterpSetUpHotnessCountdown
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mov rPROFILE, r0 @ Starting hotness countdown to rPROFILE
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/* start executing the instruction at rPC */
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FETCH_INST @ load rINST from rPC
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GET_INST_OPCODE ip @ extract opcode from rINST
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GOTO_OPCODE ip @ jump to next instruction
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/* NOTE: no fallthrough */
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