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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.
//go:build amd64
// +build amd64
package arch
const restartSyscallNr = uintptr(219)
// SyscallSaveOrig save the value of the register which is clobbered in
// syscall handler(doSyscall()).
//
// Noop on x86.
func (c *Context64) SyscallSaveOrig() {
}
// SyscallNo returns the syscall number according to the 64-bit convention.
func (c *Context64) SyscallNo() uintptr {
return uintptr(c.Regs.Orig_rax)
}
// SyscallArgs provides syscall arguments according to the 64-bit convention.
//
// Due to the way addresses are mapped for the sentry this binary *must* be
// built in 64-bit mode. So we can just assume the syscall numbers that come
// back match the expected host system call numbers.
func (c *Context64) SyscallArgs() SyscallArguments {
return SyscallArguments{
SyscallArgument{Value: uintptr(c.Regs.Rdi)},
SyscallArgument{Value: uintptr(c.Regs.Rsi)},
SyscallArgument{Value: uintptr(c.Regs.Rdx)},
SyscallArgument{Value: uintptr(c.Regs.R10)},
SyscallArgument{Value: uintptr(c.Regs.R8)},
SyscallArgument{Value: uintptr(c.Regs.R9)},
}
}
// RestartSyscall implements Context.RestartSyscall.
func (c *Context64) RestartSyscall() {
c.Regs.Rip -= SyscallWidth
c.Regs.Rax = c.Regs.Orig_rax
}
// RestartSyscallWithRestartBlock implements Context.RestartSyscallWithRestartBlock.
func (c *Context64) RestartSyscallWithRestartBlock() {
c.Regs.Rip -= SyscallWidth
c.Regs.Rax = uint64(restartSyscallNr)
}
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