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// Copyright 2019 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 amd64
// +build amd64
package ptrace
import (
"gvisor.dev/gvisor/pkg/abi/linux"
pkgcontext "gvisor.dev/gvisor/pkg/context"
"gvisor.dev/gvisor/pkg/cpuid"
"gvisor.dev/gvisor/pkg/sentry/arch"
)
// archContext is architecture-specific context.
type archContext struct {
// fpLen is the size of the floating point state.
fpLen int
// useXsave indicates whether or not xsave is in use.
useXsave bool
}
// init initializes the archContext.
func (a *archContext) init(ctx pkgcontext.Context) {
fs := cpuid.FromContext(ctx)
fpLen, _ := fs.ExtendedStateSize()
useXsave := fs.UseXsave()
a.fpLen = int(fpLen)
a.useXsave = useXsave
}
// floatingPointLength returns the length of floating point state.
func (a *archContext) floatingPointLength() uint64 {
return uint64(a.fpLen)
}
// floatingPointRegSet returns the register set to fetch.
func (a *archContext) floatingPointRegSet() uintptr {
if a.useXsave {
return linux.NT_X86_XSTATE
}
return linux.NT_PRFPREG
}
func stackPointer(r *arch.Registers) uintptr {
return uintptr(r.Rsp)
}
// x86 use the fs_base register to store the TLS pointer which can be
// get/set in "func (t *thread) get/setRegs(regs *arch.Registers)".
// So both of the get/setTLS() operations are noop here.
// getTLS gets the thread local storage register.
func (t *thread) getTLS(tls *uint64) error {
return nil
}
// setTLS sets the thread local storage register.
func (t *thread) setTLS(tls *uint64) error {
return nil
}
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