| buzbee | 1452bee | 2015-03-06 14:43:04 -0800 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2016 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | /* |
| 17 | * Interpreter entry point. |
| 18 | */ |
| 19 | |
| 20 | .text |
| 21 | .align 2 |
| 22 | .global ExecuteMterpImpl |
| 23 | .type ExecuteMterpImpl, %function |
| 24 | |
| 25 | /* |
| 26 | * On entry: |
| 27 | * r0 Thread* self/ |
| 28 | * r1 code_item |
| 29 | * r2 ShadowFrame |
| 30 | * r3 JValue* result_register |
| 31 | * |
| 32 | */ |
| 33 | |
| 34 | ExecuteMterpImpl: |
| 35 | .fnstart |
| 36 | .save {r4-r10,fp,lr} |
| 37 | stmfd sp!, {r4-r10,fp,lr} @ save 9 regs |
| 38 | .pad #4 |
| 39 | sub sp, sp, #4 @ align 64 |
| 40 | |
| 41 | /* Remember the return register */ |
| 42 | str r3, [r2, #SHADOWFRAME_RESULT_REGISTER_OFFSET] |
| 43 | |
| 44 | /* Remember the code_item */ |
| 45 | str r1, [r2, #SHADOWFRAME_CODE_ITEM_OFFSET] |
| 46 | |
| 47 | /* set up "named" registers */ |
| 48 | mov rSELF, r0 |
| 49 | ldr r0, [r2, #SHADOWFRAME_NUMBER_OF_VREGS_OFFSET] |
| 50 | add rFP, r2, #SHADOWFRAME_VREGS_OFFSET @ point to insns[] (i.e. - the dalivk byte code). |
| 51 | add rREFS, rFP, r0, lsl #2 @ point to reference array in shadow frame |
| 52 | ldr r0, [r2, #SHADOWFRAME_DEX_PC_OFFSET] @ Get starting dex_pc. |
| 53 | add rPC, r1, #CODEITEM_INSNS_OFFSET @ Point to base of insns[] |
| 54 | add rPC, rPC, r0, lsl #1 @ Create direct pointer to 1st dex opcode |
| 55 | EXPORT_PC |
| 56 | |
| 57 | /* Starting ibase */ |
| 58 | ldr rIBASE, [rSELF, #THREAD_CURRENT_IBASE_OFFSET] |
| 59 | |
| 60 | /* start executing the instruction at rPC */ |
| 61 | FETCH_INST @ load rINST from rPC |
| 62 | GET_INST_OPCODE ip @ extract opcode from rINST |
| 63 | GOTO_OPCODE ip @ jump to next instruction |
| 64 | /* NOTE: no fallthrough */ |