| //===-- ThreadMachCore.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 "ThreadMachCore.h" |
| |
| #include "lldb/Breakpoint/Watchpoint.h" |
| #include "lldb/Host/SafeMachO.h" |
| #include "lldb/Symbol/ObjectFile.h" |
| #include "lldb/Target/AppleArm64ExceptionClass.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/RegisterValue.h" |
| #include "lldb/Utility/State.h" |
| #include "lldb/Utility/StreamString.h" |
| |
| #include "ProcessMachCore.h" |
| //#include "RegisterContextKDP_arm.h" |
| //#include "RegisterContextKDP_i386.h" |
| //#include "RegisterContextKDP_x86_64.h" |
| |
| using namespace lldb; |
| using namespace lldb_private; |
| |
| // Thread Registers |
| |
| ThreadMachCore::ThreadMachCore(Process &process, lldb::tid_t tid) |
| : Thread(process, tid), m_thread_name(), m_dispatch_queue_name(), |
| m_thread_dispatch_qaddr(LLDB_INVALID_ADDRESS), m_thread_reg_ctx_sp() {} |
| |
| ThreadMachCore::~ThreadMachCore() { DestroyThread(); } |
| |
| const char *ThreadMachCore::GetName() { |
| if (m_thread_name.empty()) |
| return nullptr; |
| return m_thread_name.c_str(); |
| } |
| |
| void ThreadMachCore::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; |
| GetRegisterContext()->InvalidateIfNeeded(force); |
| } |
| |
| bool ThreadMachCore::ThreadIDIsValid(lldb::tid_t thread) { return thread != 0; } |
| |
| lldb::RegisterContextSP ThreadMachCore::GetRegisterContext() { |
| if (!m_reg_context_sp) |
| m_reg_context_sp = CreateRegisterContextForFrame(nullptr); |
| return m_reg_context_sp; |
| } |
| |
| lldb::RegisterContextSP |
| ThreadMachCore::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) { |
| if (!m_thread_reg_ctx_sp) { |
| ProcessSP process_sp(GetProcess()); |
| |
| ObjectFile *core_objfile = |
| static_cast<ProcessMachCore *>(process_sp.get())->GetCoreObjectFile(); |
| if (core_objfile) |
| m_thread_reg_ctx_sp = |
| core_objfile->GetThreadContextAtIndex(GetID(), *this); |
| } |
| reg_ctx_sp = m_thread_reg_ctx_sp; |
| } else { |
| reg_ctx_sp = GetUnwinder().CreateRegisterContextForFrame(frame); |
| } |
| return reg_ctx_sp; |
| } |
| |
| static bool IsCrashExceptionClass(AppleArm64ExceptionClass EC) { |
| switch (EC) { |
| case AppleArm64ExceptionClass::ESR_EC_UNCATEGORIZED: |
| case AppleArm64ExceptionClass::ESR_EC_SVC_32: |
| case AppleArm64ExceptionClass::ESR_EC_SVC_64: |
| // In the ARM exception model, a process takes an exception when asking the |
| // kernel to service a system call. Don't treat this like a crash. |
| return false; |
| default: |
| return true; |
| } |
| } |
| |
| bool ThreadMachCore::CalculateStopInfo() { |
| ProcessSP process_sp(GetProcess()); |
| if (process_sp) { |
| StopInfoSP stop_info; |
| RegisterContextSP reg_ctx_sp = GetRegisterContext(); |
| |
| if (reg_ctx_sp) { |
| Target &target = process_sp->GetTarget(); |
| const ArchSpec arch_spec = target.GetArchitecture(); |
| const uint32_t cputype = arch_spec.GetMachOCPUType(); |
| |
| if (cputype == llvm::MachO::CPU_TYPE_ARM64 || |
| cputype == llvm::MachO::CPU_TYPE_ARM64_32) { |
| const RegisterInfo *esr_info = reg_ctx_sp->GetRegisterInfoByName("esr"); |
| const RegisterInfo *far_info = reg_ctx_sp->GetRegisterInfoByName("far"); |
| RegisterValue esr, far; |
| if (reg_ctx_sp->ReadRegister(esr_info, esr) && |
| reg_ctx_sp->ReadRegister(far_info, far)) { |
| const uint32_t esr_val = esr.GetAsUInt32(); |
| const AppleArm64ExceptionClass exception_class = |
| getAppleArm64ExceptionClass(esr_val); |
| if (IsCrashExceptionClass(exception_class)) { |
| StreamString S; |
| S.Printf("%s (fault address: 0x%" PRIx64 ")", |
| toString(exception_class), far.GetAsUInt64()); |
| stop_info = |
| StopInfo::CreateStopReasonWithException(*this, S.GetData()); |
| } |
| } |
| } |
| } |
| |
| // Set a stop reason for crashing threads only so that they get selected |
| // preferentially. |
| if (stop_info) |
| SetStopInfo(stop_info); |
| return true; |
| } |
| return false; |
| } |