forked from OSchip/llvm-project
58 lines
1.7 KiB
C++
58 lines
1.7 KiB
C++
//===-- SingleStepCheck.h ------------------------------------- -*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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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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