63 lines
1.5 KiB
Go
63 lines
1.5 KiB
Go
// Copyright 2020 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 ptrace
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import (
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"syscall"
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"unsafe"
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"gvisor.dev/gvisor/pkg/abi/linux"
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)
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// getTLS gets the thread local storage register.
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func (t *thread) getTLS(tls *uint64) error {
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iovec := syscall.Iovec{
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Base: (*byte)(unsafe.Pointer(tls)),
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Len: uint64(unsafe.Sizeof(*tls)),
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}
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_, _, errno := syscall.RawSyscall6(
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syscall.SYS_PTRACE,
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syscall.PTRACE_GETREGSET,
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uintptr(t.tid),
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linux.NT_ARM_TLS,
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uintptr(unsafe.Pointer(&iovec)),
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0, 0)
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if errno != 0 {
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return errno
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}
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return nil
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}
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// setTLS sets the thread local storage register.
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func (t *thread) setTLS(tls *uint64) error {
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iovec := syscall.Iovec{
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Base: (*byte)(unsafe.Pointer(tls)),
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Len: uint64(unsafe.Sizeof(*tls)),
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}
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_, _, errno := syscall.RawSyscall6(
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syscall.SYS_PTRACE,
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syscall.PTRACE_SETREGSET,
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uintptr(t.tid),
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linux.NT_ARM_TLS,
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uintptr(unsafe.Pointer(&iovec)),
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0, 0)
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if errno != 0 {
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return errno
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}
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return nil
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}
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