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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
57 lines
1.8 KiB
C++
57 lines
1.8 KiB
C++
//===-- SingleStepCheck.h ------------------------------------- -*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef liblldb_SingleStepCheck_H_
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#define liblldb_SingleStepCheck_H_
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#include <memory>
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#include <sched.h>
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#include <sys/types.h>
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namespace lldb_private {
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namespace process_linux {
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// arm64 linux had a bug which prevented single-stepping and watchpoints from
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// working on non-boot cpus, due to them being incorrectly initialized after
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// coming out of suspend. This issue is particularly affecting android M, which
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// uses suspend ("doze mode") quite aggressively. This code detects that
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// situation and makes single-stepping work by doing all the step operations on
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// the boot cpu.
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//
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// The underlying issue has been fixed in android N and linux 4.4. This code can
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// be removed once these systems become obsolete.
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#if defined(__arm64__) || defined(__aarch64__)
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class SingleStepWorkaround {
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::pid_t m_tid;
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cpu_set_t m_original_set;
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SingleStepWorkaround(const SingleStepWorkaround &) = delete;
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void operator=(const SingleStepWorkaround &) = delete;
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public:
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SingleStepWorkaround(::pid_t tid, cpu_set_t original_set)
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: m_tid(tid), m_original_set(original_set) {}
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~SingleStepWorkaround();
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static std::unique_ptr<SingleStepWorkaround> Get(::pid_t tid);
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};
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#else
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class SingleStepWorkaround {
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public:
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static std::unique_ptr<SingleStepWorkaround> Get(::pid_t tid) {
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return nullptr;
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}
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};
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#endif
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} // end namespace process_linux
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} // end namespace lldb_private
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#endif // #ifndef liblldb_SingleStepCheck_H_
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