d8c338d42f
Linux arm don't support hardware stepping (neither mismatch breakpoints). This patch implement signle stepping with doing a software emulation of the next instruction and then setting a temporary breakpoint at the address where the thread will stop next. Differential revision: http://reviews.llvm.org/D8976 llvm-svn: 234987
431 lines
14 KiB
C++
431 lines
14 KiB
C++
//===-- NativeProcessLinux.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_NativeProcessLinux_H_
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#define liblldb_NativeProcessLinux_H_
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// C Includes
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#include <semaphore.h>
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#include <signal.h>
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// C++ Includes
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#include <unordered_set>
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// Other libraries and framework includes
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#include "lldb/Core/ArchSpec.h"
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#include "lldb/lldb-types.h"
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#include "lldb/Host/Debug.h"
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#include "lldb/Host/HostThread.h"
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#include "lldb/Host/Mutex.h"
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#include "lldb/Target/MemoryRegionInfo.h"
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#include "lldb/Host/common/NativeProcessProtocol.h"
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namespace lldb_private {
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class Error;
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class Module;
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class Scalar;
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namespace process_linux {
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class ThreadStateCoordinator;
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/// @class NativeProcessLinux
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/// @brief Manages communication with the inferior (debugee) process.
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///
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/// Upon construction, this class prepares and launches an inferior process for
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/// debugging.
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///
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/// Changes in the inferior process state are broadcasted.
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class NativeProcessLinux: public NativeProcessProtocol
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{
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public:
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static Error
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LaunchProcess (
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Module *exe_module,
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ProcessLaunchInfo &launch_info,
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NativeProcessProtocol::NativeDelegate &native_delegate,
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NativeProcessProtocolSP &native_process_sp);
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static Error
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AttachToProcess (
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lldb::pid_t pid,
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NativeProcessProtocol::NativeDelegate &native_delegate,
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NativeProcessProtocolSP &native_process_sp);
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// ---------------------------------------------------------------------
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// NativeProcessProtocol Interface
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// ---------------------------------------------------------------------
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Error
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Resume (const ResumeActionList &resume_actions) override;
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Error
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Halt () override;
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Error
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Detach () override;
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Error
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Signal (int signo) override;
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Error
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Interrupt () override;
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Error
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Kill () override;
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Error
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GetMemoryRegionInfo (lldb::addr_t load_addr, MemoryRegionInfo &range_info) override;
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Error
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ReadMemory (lldb::addr_t addr, void *buf, lldb::addr_t size, lldb::addr_t &bytes_read) override;
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Error
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WriteMemory (lldb::addr_t addr, const void *buf, lldb::addr_t size, lldb::addr_t &bytes_written) override;
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Error
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AllocateMemory (lldb::addr_t size, uint32_t permissions, lldb::addr_t &addr) override;
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Error
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DeallocateMemory (lldb::addr_t addr) override;
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lldb::addr_t
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GetSharedLibraryInfoAddress () override;
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size_t
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UpdateThreads () override;
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bool
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GetArchitecture (ArchSpec &arch) const override;
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Error
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SetBreakpoint (lldb::addr_t addr, uint32_t size, bool hardware) override;
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void
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DoStopIDBumped (uint32_t newBumpId) override;
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void
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Terminate () override;
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// ---------------------------------------------------------------------
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// Interface used by NativeRegisterContext-derived classes.
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// ---------------------------------------------------------------------
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/// Reads the contents from the register identified by the given (architecture
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/// dependent) offset.
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///
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/// This method is provided for use by RegisterContextLinux derivatives.
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Error
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ReadRegisterValue(lldb::tid_t tid, unsigned offset, const char *reg_name,
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unsigned size, RegisterValue &value);
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/// Writes the given value to the register identified by the given
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/// (architecture dependent) offset.
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///
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/// This method is provided for use by RegisterContextLinux derivatives.
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Error
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WriteRegisterValue(lldb::tid_t tid, unsigned offset, const char *reg_name,
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const RegisterValue &value);
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/// Reads all general purpose registers into the specified buffer.
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Error
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ReadGPR(lldb::tid_t tid, void *buf, size_t buf_size);
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/// Reads generic floating point registers into the specified buffer.
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Error
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ReadFPR(lldb::tid_t tid, void *buf, size_t buf_size);
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/// Reads the specified register set into the specified buffer.
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/// For instance, the extended floating-point register set.
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Error
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ReadRegisterSet(lldb::tid_t tid, void *buf, size_t buf_size, unsigned int regset);
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/// Writes all general purpose registers into the specified buffer.
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Error
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WriteGPR(lldb::tid_t tid, void *buf, size_t buf_size);
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/// Writes generic floating point registers into the specified buffer.
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Error
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WriteFPR(lldb::tid_t tid, void *buf, size_t buf_size);
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/// Writes the specified register set into the specified buffer.
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/// For instance, the extended floating-point register set.
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Error
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WriteRegisterSet(lldb::tid_t tid, void *buf, size_t buf_size, unsigned int regset);
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Error
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GetLoadedModuleFileSpec(const char* module_path, FileSpec& file_spec) override;
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protected:
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// ---------------------------------------------------------------------
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// NativeProcessProtocol protected interface
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// ---------------------------------------------------------------------
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Error
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GetSoftwareBreakpointTrapOpcode (size_t trap_opcode_size_hint, size_t &actual_opcode_size, const uint8_t *&trap_opcode_bytes) override;
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private:
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ArchSpec m_arch;
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HostThread m_operation_thread;
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HostThread m_monitor_thread;
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// current operation which must be executed on the priviliged thread
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void *m_operation;
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Mutex m_operation_mutex;
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// semaphores notified when Operation is ready to be processed and when
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// the operation is complete.
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sem_t m_operation_pending;
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sem_t m_operation_done;
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LazyBool m_supports_mem_region;
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std::vector<MemoryRegionInfo> m_mem_region_cache;
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Mutex m_mem_region_cache_mutex;
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std::unique_ptr<ThreadStateCoordinator> m_coordinator_up;
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HostThread m_coordinator_thread;
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// List of thread ids stepping with a breakpoint with the address of
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// the relevan breakpoint
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std::map<lldb::tid_t, lldb::addr_t> m_threads_stepping_with_breakpoint;
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struct OperationArgs
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{
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OperationArgs(NativeProcessLinux *monitor);
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~OperationArgs();
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NativeProcessLinux *m_monitor; // The monitor performing the attach.
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sem_t m_semaphore; // Posted to once operation complete.
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Error m_error; // Set if process operation failed.
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};
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/// @class LauchArgs
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///
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/// @brief Simple structure to pass data to the thread responsible for
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/// launching a child process.
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struct LaunchArgs : OperationArgs
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{
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LaunchArgs(NativeProcessLinux *monitor,
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Module *module,
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char const **argv,
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char const **envp,
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const std::string &stdin_path,
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const std::string &stdout_path,
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const std::string &stderr_path,
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const char *working_dir,
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const ProcessLaunchInfo &launch_info);
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~LaunchArgs();
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Module *m_module; // The executable image to launch.
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char const **m_argv; // Process arguments.
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char const **m_envp; // Process environment.
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const std::string &m_stdin_path; // Redirect stdin if not empty.
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const std::string &m_stdout_path; // Redirect stdout if not empty.
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const std::string &m_stderr_path; // Redirect stderr if not empty.
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const char *m_working_dir; // Working directory or NULL.
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const ProcessLaunchInfo &m_launch_info;
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};
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struct AttachArgs : OperationArgs
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{
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AttachArgs(NativeProcessLinux *monitor,
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lldb::pid_t pid);
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~AttachArgs();
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lldb::pid_t m_pid; // pid of the process to be attached.
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};
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// ---------------------------------------------------------------------
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// Private Instance Methods
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// ---------------------------------------------------------------------
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NativeProcessLinux ();
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/// Launches an inferior process ready for debugging. Forms the
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/// implementation of Process::DoLaunch.
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void
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LaunchInferior (
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Module *module,
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char const *argv[],
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char const *envp[],
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const std::string &stdin_path,
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const std::string &stdout_path,
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const std::string &stderr_path,
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const char *working_dir,
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const ProcessLaunchInfo &launch_info,
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Error &error);
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/// Attaches to an existing process. Forms the
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/// implementation of Process::DoAttach
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void
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AttachToInferior (lldb::pid_t pid, Error &error);
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void
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StartLaunchOpThread(LaunchArgs *args, Error &error);
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static void *
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LaunchOpThread(void *arg);
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static bool
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Launch(LaunchArgs *args);
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void
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StartAttachOpThread(AttachArgs *args, Error &error);
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static void *
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AttachOpThread(void *args);
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static bool
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Attach(AttachArgs *args);
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static Error
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SetDefaultPtraceOpts(const lldb::pid_t);
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static void
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ServeOperation(OperationArgs *args);
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static bool
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DupDescriptor(const char *path, int fd, int flags);
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static bool
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MonitorCallback(void *callback_baton,
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lldb::pid_t pid, bool exited, int signal, int status);
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void
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MonitorSIGTRAP(const siginfo_t *info, lldb::pid_t pid);
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void
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MonitorTrace(lldb::pid_t pid, NativeThreadProtocolSP thread_sp);
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void
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MonitorBreakpoint(lldb::pid_t pid, NativeThreadProtocolSP thread_sp);
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void
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MonitorWatchpoint(lldb::pid_t pid, NativeThreadProtocolSP thread_sp, uint32_t wp_index);
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void
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MonitorSignal(const siginfo_t *info, lldb::pid_t pid, bool exited);
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#if 0
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static ::ProcessMessage::CrashReason
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GetCrashReasonForSIGSEGV(const siginfo_t *info);
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static ::ProcessMessage::CrashReason
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GetCrashReasonForSIGILL(const siginfo_t *info);
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static ::ProcessMessage::CrashReason
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GetCrashReasonForSIGFPE(const siginfo_t *info);
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static ::ProcessMessage::CrashReason
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GetCrashReasonForSIGBUS(const siginfo_t *info);
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#endif
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void
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DoOperation(void *op);
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/// Stops the child monitor thread.
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void
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StopMonitorThread();
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/// Stops the operation thread used to attach/launch a process.
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void
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StopOpThread();
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Error
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StartCoordinatorThread ();
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static void*
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CoordinatorThread (void *arg);
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void
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StopCoordinatorThread ();
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/// Stops monitoring the child process thread.
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void
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StopMonitor();
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bool
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HasThreadNoLock (lldb::tid_t thread_id);
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NativeThreadProtocolSP
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MaybeGetThreadNoLock (lldb::tid_t thread_id);
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bool
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StopTrackingThread (lldb::tid_t thread_id);
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NativeThreadProtocolSP
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AddThread (lldb::tid_t thread_id);
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NativeThreadProtocolSP
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GetOrCreateThread (lldb::tid_t thread_id, bool &created);
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Error
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GetSoftwareBreakpointPCOffset (NativeRegisterContextSP context_sp, uint32_t &actual_opcode_size);
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Error
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FixupBreakpointPCAsNeeded (NativeThreadProtocolSP &thread_sp);
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/// Writes a siginfo_t structure corresponding to the given thread ID to the
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/// memory region pointed to by @p siginfo.
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Error
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GetSignalInfo(lldb::tid_t tid, void *siginfo);
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/// Writes the raw event message code (vis-a-vis PTRACE_GETEVENTMSG)
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/// corresponding to the given thread ID to the memory pointed to by @p
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/// message.
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Error
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GetEventMessage(lldb::tid_t tid, unsigned long *message);
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/// Resumes the given 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(lldb::tid_t tid, uint32_t signo);
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/// Single steps the given 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(lldb::tid_t tid, uint32_t signo);
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// ThreadStateCoordinator helper methods.
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void
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NotifyThreadCreateStopped (lldb::tid_t tid);
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void
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NotifyThreadCreateRunning (lldb::tid_t tid);
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void
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NotifyThreadDeath (lldb::tid_t tid);
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void
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NotifyThreadStop (lldb::tid_t tid);
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void
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CallAfterRunningThreadsStop (lldb::tid_t tid,
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const std::function<void (lldb::tid_t tid)> &call_after_function);
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void
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CallAfterRunningThreadsStopWithSkipTID (lldb::tid_t deferred_signal_tid,
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lldb::tid_t skip_stop_request_tid,
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const std::function<void (lldb::tid_t tid)> &call_after_function);
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Error
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Detach(lldb::tid_t tid);
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Error
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RequestThreadStop (const lldb::pid_t pid, const lldb::tid_t tid);
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};
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} // namespace process_linux
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} // namespace lldb_private
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#endif // #ifndef liblldb_NativeProcessLinux_H_
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