605b51b84e
Summary: On arm64, linux<=4.4 and Android<=M there is a bug, which prevents single-stepping from working when the system comes back from suspend, because of incorrectly initialized CPUs. This did not really affect Android<M, because it did not use software suspend, but it is a problem for M, which uses suspend (doze) quite extensively. Fortunately, it seems that the first CPU is not affected by this bug, so this commit implements a workaround by forcing the inferior to execute on the first cpu whenever we are doing single stepping. While inside, I have moved the implementations of Resume() and SingleStep() to the thread class (instead of process). Reviewers: tberghammer, ovyalov Subscribers: aemerson, rengolin, tberghammer, danalbert, srhines, lldb-commits Differential Revision: http://reviews.llvm.org/D17509 llvm-svn: 261636
141 lines
4.0 KiB
C++
141 lines
4.0 KiB
C++
//===-- NativeThreadLinux.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_NativeThreadLinux_H_
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#define liblldb_NativeThreadLinux_H_
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#include "lldb/lldb-private-forward.h"
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#include "lldb/Host/common/NativeThreadProtocol.h"
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#include <sched.h>
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#include <map>
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#include <memory>
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#include <string>
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namespace lldb_private {
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namespace process_linux {
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class NativeProcessLinux;
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class NativeThreadLinux : public NativeThreadProtocol
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{
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friend class NativeProcessLinux;
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public:
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NativeThreadLinux (NativeProcessLinux *process, lldb::tid_t tid);
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// ---------------------------------------------------------------------
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// NativeThreadProtocol Interface
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// ---------------------------------------------------------------------
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std::string
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GetName() override;
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lldb::StateType
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GetState () override;
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bool
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GetStopReason (ThreadStopInfo &stop_info, std::string& description) override;
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NativeRegisterContextSP
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GetRegisterContext () override;
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Error
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SetWatchpoint (lldb::addr_t addr, size_t size, uint32_t watch_flags, bool hardware) override;
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Error
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RemoveWatchpoint (lldb::addr_t addr) override;
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private:
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// ---------------------------------------------------------------------
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// Interface for friend classes
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// ---------------------------------------------------------------------
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/// Resumes the thread. If @p signo is anything but
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/// LLDB_INVALID_SIGNAL_NUMBER, deliver that signal to the thread.
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Error
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Resume(uint32_t signo);
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/// Single steps the thread. If @p signo is anything but
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/// LLDB_INVALID_SIGNAL_NUMBER, deliver that signal to the thread.
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Error
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SingleStep(uint32_t signo);
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void
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SetStoppedBySignal(uint32_t signo, const siginfo_t *info = nullptr);
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/// Return true if the thread is stopped.
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/// If stopped by a signal, indicate the signo in the signo argument.
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/// Otherwise, return LLDB_INVALID_SIGNAL_NUMBER.
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bool
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IsStopped (int *signo);
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void
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SetStoppedByExec ();
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void
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SetStoppedByBreakpoint ();
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void
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SetStoppedByWatchpoint (uint32_t wp_index);
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bool
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IsStoppedAtBreakpoint ();
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bool
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IsStoppedAtWatchpoint ();
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void
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SetStoppedByTrace ();
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void
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SetStoppedWithNoReason ();
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void
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SetExited ();
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Error
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RequestStop ();
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// ---------------------------------------------------------------------
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// Private interface
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// ---------------------------------------------------------------------
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void
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MaybeLogStateChange (lldb::StateType new_state);
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NativeProcessLinux &
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GetProcess();
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void
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SetStopped();
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inline void
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MaybePrepareSingleStepWorkaround();
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inline void
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MaybeCleanupSingleStepWorkaround();
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// ---------------------------------------------------------------------
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// Member Variables
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// ---------------------------------------------------------------------
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lldb::StateType m_state;
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ThreadStopInfo m_stop_info;
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NativeRegisterContextSP m_reg_context_sp;
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std::string m_stop_description;
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using WatchpointIndexMap = std::map<lldb::addr_t, uint32_t>;
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WatchpointIndexMap m_watchpoint_index_map;
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cpu_set_t m_original_cpu_set; // For single-step workaround.
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};
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typedef std::shared_ptr<NativeThreadLinux> NativeThreadLinuxSP;
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} // namespace process_linux
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} // namespace lldb_private
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#endif // #ifndef liblldb_NativeThreadLinux_H_
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