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//===-- 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 = GetLog(KDPLog::Thread);
LLDB_LOG(log, "this = {0}, tid = {1:x}", this, GetID());
}
ThreadKDP::~ThreadKDP() {
Log *log = GetLog(KDPLog::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);
}
}
}
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