2019-04-29 21:25:05 +00:00
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// Copyright 2018 The gVisor Authors.
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2018-04-27 17:37:02 +00:00
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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 linux
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import (
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2019-06-13 23:49:09 +00:00
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"gvisor.dev/gvisor/pkg/abi/linux"
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"gvisor.dev/gvisor/pkg/sentry/arch"
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"gvisor.dev/gvisor/pkg/sentry/kernel"
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2019-07-09 23:16:46 +00:00
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"gvisor.dev/gvisor/pkg/syserror"
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2018-04-27 17:37:02 +00:00
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)
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// ArchPrctl implements linux syscall arch_prctl(2).
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// It sets architecture-specific process or thread state for t.
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func ArchPrctl(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
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switch args[0].Int() {
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case linux.ARCH_GET_FS:
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addr := args[1].Pointer()
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2018-12-10 20:36:27 +00:00
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fsbase := t.Arch().TLS()
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_, err := t.CopyOut(addr, uint64(fsbase))
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2018-04-27 17:37:02 +00:00
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if err != nil {
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return 0, nil, err
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}
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case linux.ARCH_SET_FS:
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2018-08-10 17:25:37 +00:00
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fsbase := args[1].Uint64()
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2018-12-10 20:36:27 +00:00
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if !t.Arch().SetTLS(uintptr(fsbase)) {
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2019-07-09 23:16:46 +00:00
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return 0, nil, syserror.EPERM
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2018-08-10 17:25:37 +00:00
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}
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2018-04-27 17:37:02 +00:00
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2018-10-20 18:12:26 +00:00
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case linux.ARCH_GET_GS, linux.ARCH_SET_GS:
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t.Kernel().EmitUnimplementedEvent(t)
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fallthrough
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2018-04-27 17:37:02 +00:00
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default:
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2019-07-09 23:16:46 +00:00
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return 0, nil, syserror.EINVAL
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2018-04-27 17:37:02 +00:00
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}
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return 0, nil, nil
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}
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