github.com/bytedance/mockey@v1.2.10/internal/monkey/inst/inst_amd64.go (about) 1 /* 2 * Copyright 2022 ByteDance Inc. 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 package inst 18 19 import "unsafe" 20 21 func BranchTo(to uintptr) (res []byte) { 22 res = append(res, rdxMOV(to)...) // MOVABS RDX, to 23 res = append(res, []byte{0xff, 0xe2}...) // JMP RDX 24 return 25 } 26 27 func BranchInto(to uintptr) (res []byte) { 28 res = append(res, rdxMOV(to)...) // MOVABS RDX, to 29 res = append(res, []byte{0xff, 0x22}...) // JMP [RDX] 30 return 31 } 32 33 // rdxMOV moves the 64bit value to rdx register, using the following instruction: 34 // MOVABS RDX, val 35 func rdxMOV(val uintptr) []byte { 36 res := make([]byte, unsafe.Sizeof(val)) 37 *(*uintptr)(unsafe.Pointer(&res[0])) = val 38 res = append([]byte{0x48, 0xba}, res...) 39 return res 40 }