60 lines
1.6 KiB
Go
60 lines
1.6 KiB
Go
// Copyright 2019 The gVisor Authors.
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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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// +build arm64
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package testutil
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import (
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"fmt"
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"reflect"
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"syscall"
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)
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// SetTestTarget sets the rip appropriately.
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func SetTestTarget(regs *syscall.PtraceRegs, fn func()) {
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regs.Pc = uint64(reflect.ValueOf(fn).Pointer())
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}
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// SetTouchTarget sets rax appropriately.
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func SetTouchTarget(regs *syscall.PtraceRegs, target *uintptr) {
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if target != nil {
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regs.Regs[8] = uint64(reflect.ValueOf(target).Pointer())
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} else {
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regs.Regs[8] = 0
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}
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}
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// RewindSyscall rewinds a syscall RIP.
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func RewindSyscall(regs *syscall.PtraceRegs) {
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regs.Pc -= 4
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}
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// SetTestRegs initializes registers to known values.
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func SetTestRegs(regs *syscall.PtraceRegs) {
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for i := 0; i <= 30; i++ {
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regs.Regs[i] = uint64(i) + 1
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}
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}
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// CheckTestRegs checks that registers were twiddled per TwiddleRegs.
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func CheckTestRegs(regs *syscall.PtraceRegs, full bool) (err error) {
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for i := 0; i <= 30; i++ {
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if need := ^uint64(i + 1); regs.Regs[i] != need {
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err = addRegisterMismatch(err, fmt.Sprintf("R%d", i), regs.Regs[i], need)
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}
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}
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return
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}
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