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//===-- 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,
uint32_t objfile_lc_thread_idx)
: Thread(process, tid), m_thread_name(), m_dispatch_queue_name(),
m_thread_dispatch_qaddr(LLDB_INVALID_ADDRESS), m_thread_reg_ctx_sp(),
m_objfile_lc_thread_idx(objfile_lc_thread_idx) {}
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(
m_objfile_lc_thread_idx, *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;
}
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