2019-04-29 21:25:05 +00:00
|
|
|
// Copyright 2018 The gVisor Authors.
|
2018-04-27 17:37:02 +00:00
|
|
|
//
|
|
|
|
// 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.
|
|
|
|
|
|
|
|
// +build amd64
|
|
|
|
|
|
|
|
package testutil
|
|
|
|
|
|
|
|
import (
|
|
|
|
"reflect"
|
|
|
|
"syscall"
|
|
|
|
)
|
|
|
|
|
|
|
|
// SetTestTarget sets the rip appropriately.
|
|
|
|
func SetTestTarget(regs *syscall.PtraceRegs, fn func()) {
|
|
|
|
regs.Rip = uint64(reflect.ValueOf(fn).Pointer())
|
|
|
|
}
|
|
|
|
|
|
|
|
// SetTouchTarget sets rax appropriately.
|
|
|
|
func SetTouchTarget(regs *syscall.PtraceRegs, target *uintptr) {
|
|
|
|
if target != nil {
|
|
|
|
regs.Rax = uint64(reflect.ValueOf(target).Pointer())
|
|
|
|
} else {
|
|
|
|
regs.Rax = 0
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
// RewindSyscall rewinds a syscall RIP.
|
|
|
|
func RewindSyscall(regs *syscall.PtraceRegs) {
|
|
|
|
regs.Rip -= 2
|
|
|
|
}
|
|
|
|
|
|
|
|
// SetTestRegs initializes registers to known values.
|
|
|
|
func SetTestRegs(regs *syscall.PtraceRegs) {
|
|
|
|
regs.R15 = 0x15
|
|
|
|
regs.R14 = 0x14
|
|
|
|
regs.R13 = 0x13
|
|
|
|
regs.R12 = 0x12
|
|
|
|
regs.Rbp = 0xb9
|
|
|
|
regs.Rbx = 0xb4
|
|
|
|
regs.R11 = 0x11
|
|
|
|
regs.R10 = 0x10
|
|
|
|
regs.R9 = 0x09
|
|
|
|
regs.R8 = 0x08
|
|
|
|
regs.Rax = 0x44
|
|
|
|
regs.Rcx = 0xc4
|
|
|
|
regs.Rdx = 0xd4
|
|
|
|
regs.Rsi = 0x51
|
|
|
|
regs.Rdi = 0xd1
|
|
|
|
regs.Rsp = 0x59
|
|
|
|
}
|
|
|
|
|
|
|
|
// CheckTestRegs checks that registers were twiddled per TwiddleRegs.
|
|
|
|
func CheckTestRegs(regs *syscall.PtraceRegs, full bool) (err error) {
|
|
|
|
if need := ^uint64(0x15); regs.R15 != need {
|
|
|
|
err = addRegisterMismatch(err, "R15", regs.R15, need)
|
|
|
|
}
|
|
|
|
if need := ^uint64(0x14); regs.R14 != need {
|
|
|
|
err = addRegisterMismatch(err, "R14", regs.R14, need)
|
|
|
|
}
|
|
|
|
if need := ^uint64(0x13); regs.R13 != need {
|
|
|
|
err = addRegisterMismatch(err, "R13", regs.R13, need)
|
|
|
|
}
|
|
|
|
if need := ^uint64(0x12); regs.R12 != need {
|
|
|
|
err = addRegisterMismatch(err, "R12", regs.R12, need)
|
|
|
|
}
|
|
|
|
if need := ^uint64(0xb9); regs.Rbp != need {
|
|
|
|
err = addRegisterMismatch(err, "Rbp", regs.Rbp, need)
|
|
|
|
}
|
|
|
|
if need := ^uint64(0xb4); regs.Rbx != need {
|
|
|
|
err = addRegisterMismatch(err, "Rbx", regs.Rbx, need)
|
|
|
|
}
|
|
|
|
if need := ^uint64(0x10); regs.R10 != need {
|
|
|
|
err = addRegisterMismatch(err, "R10", regs.R10, need)
|
|
|
|
}
|
|
|
|
if need := ^uint64(0x09); regs.R9 != need {
|
|
|
|
err = addRegisterMismatch(err, "R9", regs.R9, need)
|
|
|
|
}
|
|
|
|
if need := ^uint64(0x08); regs.R8 != need {
|
|
|
|
err = addRegisterMismatch(err, "R8", regs.R8, need)
|
|
|
|
}
|
|
|
|
if need := ^uint64(0x44); regs.Rax != need {
|
|
|
|
err = addRegisterMismatch(err, "Rax", regs.Rax, need)
|
|
|
|
}
|
|
|
|
if need := ^uint64(0xd4); regs.Rdx != need {
|
|
|
|
err = addRegisterMismatch(err, "Rdx", regs.Rdx, need)
|
|
|
|
}
|
|
|
|
if need := ^uint64(0x51); regs.Rsi != need {
|
|
|
|
err = addRegisterMismatch(err, "Rsi", regs.Rsi, need)
|
|
|
|
}
|
|
|
|
if need := ^uint64(0xd1); regs.Rdi != need {
|
|
|
|
err = addRegisterMismatch(err, "Rdi", regs.Rdi, need)
|
|
|
|
}
|
|
|
|
if need := ^uint64(0x59); regs.Rsp != need {
|
|
|
|
err = addRegisterMismatch(err, "Rsp", regs.Rsp, need)
|
|
|
|
}
|
|
|
|
// Rcx & R11 are ignored if !full is set.
|
|
|
|
if need := ^uint64(0x11); full && regs.R11 != need {
|
|
|
|
err = addRegisterMismatch(err, "R11", regs.R11, need)
|
|
|
|
}
|
|
|
|
if need := ^uint64(0xc4); full && regs.Rcx != need {
|
|
|
|
err = addRegisterMismatch(err, "Rcx", regs.Rcx, need)
|
|
|
|
}
|
|
|
|
return
|
|
|
|
}
|
|
|
|
|
|
|
|
var fsData uint64 = 0x55
|
|
|
|
var gsData uint64 = 0x85
|
|
|
|
|
|
|
|
// SetTestSegments initializes segments to known values.
|
|
|
|
func SetTestSegments(regs *syscall.PtraceRegs) {
|
|
|
|
regs.Fs_base = uint64(reflect.ValueOf(&fsData).Pointer())
|
|
|
|
regs.Gs_base = uint64(reflect.ValueOf(&gsData).Pointer())
|
|
|
|
}
|
|
|
|
|
|
|
|
// CheckTestSegments checks that registers were twiddled per TwiddleSegments.
|
|
|
|
func CheckTestSegments(regs *syscall.PtraceRegs) (err error) {
|
|
|
|
if regs.Rax != fsData {
|
|
|
|
err = addRegisterMismatch(err, "Rax", regs.Rax, fsData)
|
|
|
|
}
|
|
|
|
if regs.Rbx != gsData {
|
|
|
|
err = addRegisterMismatch(err, "Rbx", regs.Rcx, gsData)
|
|
|
|
}
|
|
|
|
return
|
|
|
|
}
|