1/** 2 * Copyright (c) 2021-2022 Huawei Device Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 16#define xlr x30 17 18.global ExecuteImplStub 19.type ExecuteImplStub, %function 20/* parameter: 21 * x0 thread 22 * x1 PC 23 * x2 I-frame 24 * x3 impl 25 */ 26ExecuteImplStub: 27 .cfi_startproc 28 stp x20, xlr, [sp, #-16]! 29 .cfi_adjust_cfa_offset 16 30 .cfi_rel_offset x20, 0 31 .cfi_rel_offset xlr, 8 32 /* 33 * Using CFI opcode to get the interpreter PC from 34 * saved register with offset. 35 * 36 * 0x16 DW_CFA_val_expression 37 * 0 tempReg 38 * 0x09 size of expression 39 * 0x0C DW_OP_const4u 40 * 0x41, 0x45, 0x58, 0x31 magic = "AEX1" 41 * 0x13 DW_OP_drop 42 * 0x92 DW_OP_bregx 43 * 20 the register which store interpreter PC 44 * 0 offset 45 */ 46 .cfi_escape 0x16, 0, 0x09, 0x0C, 0x41, 0x45, 0x58, 0x31, 0x13, 0x92, 20, 0 47 48 mov x20, x1 49 blr x3 50 51 ldp x20, xlr, [sp], #16 52 .cfi_restore x20 53 .cfi_restore xlr 54 .cfi_adjust_cfa_offset -16 55 ret 56 .cfi_endproc 57 58#undefine xlr 59