83 lines
2.3 KiB
C++
83 lines
2.3 KiB
C++
/*
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* Copyright (C) 2011 The Android Open Source Project
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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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*/
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#include "thread.h"
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#include "asm_support_x86_64.h"
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#include "base/macros.h"
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#include "thread-current-inl.h"
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#include "thread_list.h"
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#if defined(__linux__)
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#include <asm/prctl.h>
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#include <sys/prctl.h>
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#include <sys/syscall.h>
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#elif defined(__Fuchsia__)
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#include <zircon/process.h>
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#include <zircon/syscalls.h>
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#include <zircon/syscalls/object.h>
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#endif
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namespace art {
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#if defined(__linux__)
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static void arch_prctl(int code, void* val) {
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syscall(__NR_arch_prctl, code, val);
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}
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#endif
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void Thread::InitCpu() {
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MutexLock mu(nullptr, *Locks::modify_ldt_lock_);
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#if defined(__linux__)
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arch_prctl(ARCH_SET_GS, this);
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#elif defined(__Fuchsia__)
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Thread* thread_ptr = this;
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zx_status_t status = zx_object_set_property(zx_thread_self(),
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ZX_PROP_REGISTER_GS,
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&thread_ptr,
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sizeof(thread_ptr));
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CHECK_EQ(status, ZX_OK) << "failed to set GS register";
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#else
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UNIMPLEMENTED(FATAL) << "Need to set GS";
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#endif
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// Allow easy indirection back to Thread*.
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tlsPtr_.self = this;
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// Check that the reads from %gs point to this Thread*.
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Thread* self_check;
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__asm__ __volatile__("movq %%gs:(%1), %0"
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: "=r"(self_check) // output
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: "r"(THREAD_SELF_OFFSET) // input
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:); // clobber
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CHECK_EQ(self_check, this);
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}
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void Thread::CleanupCpu() {
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// Check that the reads from %gs point to this Thread*.
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Thread* self_check;
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__asm__ __volatile__("movq %%gs:(%1), %0"
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: "=r"(self_check) // output
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: "r"(THREAD_SELF_OFFSET) // input
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:); // clobber
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CHECK_EQ(self_check, this);
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// Do nothing.
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}
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} // namespace art
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