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  }