github.com/SagerNet/gvisor@v0.0.0-20210707092255-7731c139d75c/pkg/sentry/platform/ptrace/ptrace_amd64.go (about) 1 // Copyright 2019 The gVisor Authors. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 package ptrace 16 17 import ( 18 "github.com/SagerNet/gvisor/pkg/abi/linux" 19 "github.com/SagerNet/gvisor/pkg/sentry/arch" 20 ) 21 22 // fpRegSet returns the GETREGSET/SETREGSET register set type to be used. 23 func fpRegSet(useXsave bool) uintptr { 24 if useXsave { 25 return linux.NT_X86_XSTATE 26 } 27 return linux.NT_PRFPREG 28 } 29 30 func stackPointer(r *arch.Registers) uintptr { 31 return uintptr(r.Rsp) 32 } 33 34 // x86 use the fs_base register to store the TLS pointer which can be 35 // get/set in "func (t *thread) get/setRegs(regs *arch.Registers)". 36 // So both of the get/setTLS() operations are noop here. 37 38 // getTLS gets the thread local storage register. 39 func (t *thread) getTLS(tls *uint64) error { 40 return nil 41 } 42 43 // setTLS sets the thread local storage register. 44 func (t *thread) setTLS(tls *uint64) error { 45 return nil 46 }