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// Copyright 2018 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.
package boot
import (
"fmt"
"syscall"
"gvisor.dev/gvisor/pkg/abi"
"gvisor.dev/gvisor/pkg/sentry/arch"
rpb "gvisor.dev/gvisor/pkg/sentry/arch/registers_go_proto"
"gvisor.dev/gvisor/pkg/sentry/strace"
)
const (
// reportLimit is the max number of events that should be reported per
// tracker.
reportLimit = 100
syscallLink = "https://gvisor.dev/c/linux/amd64"
)
// newRegs create a empty Registers instance.
func newRegs() *rpb.Registers {
return &rpb.Registers{
Arch: &rpb.Registers_Amd64{
Amd64: &rpb.AMD64Registers{},
},
}
}
func argVal(argIdx int, regs *rpb.Registers) uint64 {
amd64Regs := regs.GetArch().(*rpb.Registers_Amd64).Amd64
switch argIdx {
case 0:
return amd64Regs.Rdi
case 1:
return amd64Regs.Rsi
case 2:
return amd64Regs.Rdx
case 3:
return amd64Regs.R10
case 4:
return amd64Regs.R8
case 5:
return amd64Regs.R9
}
panic(fmt.Sprintf("invalid syscall argument index %d", argIdx))
}
func setArgVal(argIdx int, argVal uint64, regs *rpb.Registers) {
amd64Regs := regs.GetArch().(*rpb.Registers_Amd64).Amd64
switch argIdx {
case 0:
amd64Regs.Rdi = argVal
case 1:
amd64Regs.Rsi = argVal
case 2:
amd64Regs.Rdx = argVal
case 3:
amd64Regs.R10 = argVal
case 4:
amd64Regs.R8 = argVal
case 5:
amd64Regs.R9 = argVal
default:
panic(fmt.Sprintf("invalid syscall argument index %d", argIdx))
}
}
func getSyscallNameMap() (strace.SyscallMap, bool) {
return strace.Lookup(abi.Linux, arch.AMD64)
}
func syscallNum(regs *rpb.Registers) uint64 {
amd64Regs := regs.GetArch().(*rpb.Registers_Amd64).Amd64
return amd64Regs.OrigRax
}
func newArchArgsTracker(sysnr uint64) syscallTracker {
switch sysnr {
case syscall.SYS_ARCH_PRCTL:
// args: cmd, ...
return newArgsTracker(0)
}
return nil
}
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