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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 usertrap
import (
"gvisor.dev/gvisor/pkg/context"
"gvisor.dev/gvisor/pkg/hostarch"
"gvisor.dev/gvisor/pkg/sentry/arch"
"gvisor.dev/gvisor/pkg/sentry/memmap"
"gvisor.dev/gvisor/pkg/usermem"
)
// trapNR is the maximum number of traps what can fit in the trap table.
const trapNR = 256
// trapSize is the size of one trap.
const trapSize = 80
// TrapTableSize returns the maximum size of a trap table.
func TrapTableSize() uintptr {
return uintptr(trapNR * trapSize)
}
type memoryManager interface {
usermem.IO
MMap(ctx context.Context, opts memmap.MMapOpts) (hostarch.Addr, error)
}
// State represents the current state of the trap table.
//
// +stateify savable
type State struct {
}
// New returns the new state structure.
func New() *State {
return &State{}
}
func (*State) PatchSyscall(ctx context.Context, ac *arch.Context64, mm memoryManager) (restart bool, err error) {
return false /* restart */, nil
}
// HandleFault handles a fault on a patched syscall instruction.
func (*State) HandleFault(ctx context.Context, ac *arch.Context64, mm memoryManager) error {
return nil
}
// PreFork does nothing on arm64 as syscall trapping is not supported.
func (*State) PreFork() {
}
// PostFork does nothing on arm64 as syscall trapping is not supported.
func (*State) PostFork() {
}
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