| //===-- SingleStepCheck.h ------------------------------------- -*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef liblldb_SingleStepCheck_H_ |
| #define liblldb_SingleStepCheck_H_ |
| |
| #include <memory> |
| #include <sched.h> |
| #include <sys/types.h> |
| |
| namespace lldb_private { |
| namespace process_linux { |
| |
| // arm64 linux had a bug which prevented single-stepping and watchpoints from |
| // working on non-boot cpus, due to them being incorrectly initialized after |
| // coming out of suspend. This issue is particularly affecting android M, which |
| // uses suspend ("doze mode") quite aggressively. This code detects that |
| // situation and makes single-stepping work by doing all the step operations on |
| // the boot cpu. |
| // |
| // The underlying issue has been fixed in android N and linux 4.4. This code can |
| // be removed once these systems become obsolete. |
| |
| #if defined(__arm64__) || defined(__aarch64__) |
| class SingleStepWorkaround { |
| ::pid_t m_tid; |
| cpu_set_t m_original_set; |
| |
| SingleStepWorkaround(const SingleStepWorkaround &) = delete; |
| void operator=(const SingleStepWorkaround &) = delete; |
| |
| public: |
| SingleStepWorkaround(::pid_t tid, cpu_set_t original_set) |
| : m_tid(tid), m_original_set(original_set) {} |
| ~SingleStepWorkaround(); |
| |
| static std::unique_ptr<SingleStepWorkaround> Get(::pid_t tid); |
| }; |
| #else |
| class SingleStepWorkaround { |
| public: |
| static std::unique_ptr<SingleStepWorkaround> Get(::pid_t tid) { |
| return nullptr; |
| } |
| }; |
| #endif |
| |
| } // end namespace process_linux |
| } // end namespace lldb_private |
| |
| #endif // #ifndef liblldb_SingleStepCheck_H_ |