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// Copyright 2020 The gVisor Authors.
//
// 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.
//go:build arm64
// +build arm64
package systrap
import (
"unsafe"
"golang.org/x/sys/unix"
"gvisor.dev/gvisor/pkg/abi/linux"
)
// getTLS gets the thread local storage register.
func (t *thread) getTLS(tls *uint64) error {
iovec := unix.Iovec{
Base: (*byte)(unsafe.Pointer(tls)),
Len: uint64(unsafe.Sizeof(*tls)),
}
_, _, errno := unix.RawSyscall6(
unix.SYS_PTRACE,
unix.PTRACE_GETREGSET,
uintptr(t.tid),
linux.NT_ARM_TLS,
uintptr(unsafe.Pointer(&iovec)),
0, 0)
if errno != 0 {
return errno
}
return nil
}
// setTLS sets the thread local storage register.
func (t *thread) setTLS(tls *uint64) error {
iovec := unix.Iovec{
Base: (*byte)(unsafe.Pointer(tls)),
Len: uint64(unsafe.Sizeof(*tls)),
}
_, _, errno := unix.RawSyscall6(
unix.SYS_PTRACE,
unix.PTRACE_SETREGSET,
uintptr(t.tid),
linux.NT_ARM_TLS,
uintptr(unsafe.Pointer(&iovec)),
0, 0)
if errno != 0 {
return errno
}
return nil
}
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