| //===-- ThreadKDP.cpp -----------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "ThreadKDP.h" |
| |
| #include "lldb/Host/SafeMachO.h" |
| |
| #include "lldb/Breakpoint/Watchpoint.h" |
| #include "lldb/Target/Process.h" |
| #include "lldb/Target/RegisterContext.h" |
| #include "lldb/Target/StopInfo.h" |
| #include "lldb/Target/Target.h" |
| #include "lldb/Target/Unwind.h" |
| #include "lldb/Utility/ArchSpec.h" |
| #include "lldb/Utility/DataExtractor.h" |
| #include "lldb/Utility/State.h" |
| #include "lldb/Utility/StreamString.h" |
| |
| #include "Plugins/Process/Utility/StopInfoMachException.h" |
| #include "ProcessKDP.h" |
| #include "ProcessKDPLog.h" |
| #include "RegisterContextKDP_arm.h" |
| #include "RegisterContextKDP_arm64.h" |
| #include "RegisterContextKDP_i386.h" |
| #include "RegisterContextKDP_x86_64.h" |
| |
| #include <memory> |
| |
| using namespace lldb; |
| using namespace lldb_private; |
| |
| // Thread Registers |
| |
| ThreadKDP::ThreadKDP(Process &process, lldb::tid_t tid) |
| : Thread(process, tid), m_thread_name(), m_dispatch_queue_name(), |
| m_thread_dispatch_qaddr(LLDB_INVALID_ADDRESS) { |
| Log *log = ProcessKDPLog::GetLogIfAllCategoriesSet(KDP_LOG_THREAD); |
| LLDB_LOG(log, "this = {0}, tid = {1:x}", this, GetID()); |
| } |
| |
| ThreadKDP::~ThreadKDP() { |
| Log *log = ProcessKDPLog::GetLogIfAllCategoriesSet(KDP_LOG_THREAD); |
| LLDB_LOG(log, "this = {0}, tid = {1:x}", this, GetID()); |
| DestroyThread(); |
| } |
| |
| const char *ThreadKDP::GetName() { |
| if (m_thread_name.empty()) |
| return nullptr; |
| return m_thread_name.c_str(); |
| } |
| |
| const char *ThreadKDP::GetQueueName() { return nullptr; } |
| |
| void ThreadKDP::RefreshStateAfterStop() { |
| // Invalidate all registers in our register context. We don't set "force" to |
| // true because the stop reply packet might have had some register values |
| // that were expedited and these will already be copied into the register |
| // context by the time this function gets called. The KDPRegisterContext |
| // class has been made smart enough to detect when it needs to invalidate |
| // which registers are valid by putting hooks in the register read and |
| // register supply functions where they check the process stop ID and do the |
| // right thing. |
| const bool force = false; |
| lldb::RegisterContextSP reg_ctx_sp(GetRegisterContext()); |
| if (reg_ctx_sp) |
| reg_ctx_sp->InvalidateIfNeeded(force); |
| } |
| |
| bool ThreadKDP::ThreadIDIsValid(lldb::tid_t thread) { return thread != 0; } |
| |
| void ThreadKDP::Dump(Log *log, uint32_t index) {} |
| |
| bool ThreadKDP::ShouldStop(bool &step_more) { return true; } |
| lldb::RegisterContextSP ThreadKDP::GetRegisterContext() { |
| if (!m_reg_context_sp) |
| m_reg_context_sp = CreateRegisterContextForFrame(nullptr); |
| return m_reg_context_sp; |
| } |
| |
| lldb::RegisterContextSP |
| ThreadKDP::CreateRegisterContextForFrame(StackFrame *frame) { |
| lldb::RegisterContextSP reg_ctx_sp; |
| uint32_t concrete_frame_idx = 0; |
| |
| if (frame) |
| concrete_frame_idx = frame->GetConcreteFrameIndex(); |
| |
| if (concrete_frame_idx == 0) { |
| ProcessSP process_sp(CalculateProcess()); |
| if (process_sp) { |
| switch (static_cast<ProcessKDP *>(process_sp.get()) |
| ->GetCommunication() |
| .GetCPUType()) { |
| case llvm::MachO::CPU_TYPE_ARM: |
| reg_ctx_sp = |
| std::make_shared<RegisterContextKDP_arm>(*this, concrete_frame_idx); |
| break; |
| case llvm::MachO::CPU_TYPE_ARM64: |
| reg_ctx_sp = std::make_shared<RegisterContextKDP_arm64>( |
| *this, concrete_frame_idx); |
| break; |
| case llvm::MachO::CPU_TYPE_I386: |
| reg_ctx_sp = std::make_shared<RegisterContextKDP_i386>( |
| *this, concrete_frame_idx); |
| break; |
| case llvm::MachO::CPU_TYPE_X86_64: |
| reg_ctx_sp = std::make_shared<RegisterContextKDP_x86_64>( |
| *this, concrete_frame_idx); |
| break; |
| default: |
| llvm_unreachable("Add CPU type support in KDP"); |
| } |
| } |
| } else { |
| reg_ctx_sp = GetUnwinder().CreateRegisterContextForFrame(frame); |
| } |
| return reg_ctx_sp; |
| } |
| |
| bool ThreadKDP::CalculateStopInfo() { |
| ProcessSP process_sp(GetProcess()); |
| if (process_sp) { |
| if (m_cached_stop_info_sp) { |
| SetStopInfo(m_cached_stop_info_sp); |
| } else { |
| SetStopInfo(StopInfo::CreateStopReasonWithSignal(*this, SIGSTOP)); |
| } |
| return true; |
| } |
| return false; |
| } |
| |
| void ThreadKDP::SetStopInfoFrom_KDP_EXCEPTION( |
| const DataExtractor &exc_reply_packet) { |
| lldb::offset_t offset = 0; |
| uint8_t reply_command = exc_reply_packet.GetU8(&offset); |
| if (reply_command == CommunicationKDP::KDP_EXCEPTION) { |
| offset = 8; |
| const uint32_t count = exc_reply_packet.GetU32(&offset); |
| if (count >= 1) { |
| // const uint32_t cpu = exc_reply_packet.GetU32 (&offset); |
| offset += 4; // Skip the useless CPU field |
| const uint32_t exc_type = exc_reply_packet.GetU32(&offset); |
| const uint32_t exc_code = exc_reply_packet.GetU32(&offset); |
| const uint32_t exc_subcode = exc_reply_packet.GetU32(&offset); |
| // We have to make a copy of the stop info because the thread list will |
| // iterate through the threads and clear all stop infos.. |
| |
| // Let the StopInfoMachException::CreateStopReasonWithMachException() |
| // function update the PC if needed as we might hit a software breakpoint |
| // and need to decrement the PC (i386 and x86_64 need this) and KDP |
| // doesn't do this for us. |
| const bool pc_already_adjusted = false; |
| const bool adjust_pc_if_needed = true; |
| |
| m_cached_stop_info_sp = |
| StopInfoMachException::CreateStopReasonWithMachException( |
| *this, exc_type, 2, exc_code, exc_subcode, 0, pc_already_adjusted, |
| adjust_pc_if_needed); |
| } |
| } |
| } |