53 lines
1.8 KiB
Go
53 lines
1.8 KiB
Go
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// Copyright 2018 Google Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// +build amd64
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package arch
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const restartSyscallNr = uintptr(219)
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// SyscallNo returns the syscall number according to the 64-bit convention.
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func (c *context64) SyscallNo() uintptr {
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return uintptr(c.Regs.Orig_rax)
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}
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// SyscallArgs provides syscall arguments according to the 64-bit convention.
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//
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// Due to the way addresses are mapped for the sentry this binary *must* be
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// built in 64-bit mode. So we can just assume the syscall numbers that come
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// back match the expected host system call numbers.
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func (c *context64) SyscallArgs() SyscallArguments {
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return SyscallArguments{
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SyscallArgument{Value: uintptr(c.Regs.Rdi)},
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SyscallArgument{Value: uintptr(c.Regs.Rsi)},
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SyscallArgument{Value: uintptr(c.Regs.Rdx)},
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SyscallArgument{Value: uintptr(c.Regs.R10)},
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SyscallArgument{Value: uintptr(c.Regs.R8)},
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SyscallArgument{Value: uintptr(c.Regs.R9)},
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}
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}
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// RestartSyscall implements Context.RestartSyscall.
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func (c *context64) RestartSyscall() {
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c.Regs.Rip -= SyscallWidth
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c.Regs.Rax = c.Regs.Orig_rax
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}
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// RestartSyscallWithRestartBlock implements Context.RestartSyscallWithRestartBlock.
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func (c *context64) RestartSyscallWithRestartBlock() {
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c.Regs.Rip -= SyscallWidth
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c.Regs.Rax = uint64(restartSyscallNr)
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}
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