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DolphinQt: Properly lock CPU before accessing emulated memory

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This fixes a problem I was having where using frame advance with the
debugger open would frequently cause panic alerts about invalid addresses
due to the CPU thread changing MSR.DR while the host thread was trying
to access memory.

To aid in tracking down all the places where we weren't properly locking
the CPU, I've created a new type (in Core.h) that you have to pass as a
reference or pointer to functions that require running as the CPU thread.
This commit is contained in:
JosJuice
2023-02-12 11:07:11 +01:00
parent efed037c4a
commit 7cecb28bdf
79 changed files with 1796 additions and 1184 deletions
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15
Source/Core/Common/Debug/CodeTrace.cpp
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@ -122,14 +122,14 @@ InstructionAttributes CodeTrace::GetInstructionAttributes(const TraceOutput& ins
return tmp_attributes;
}
TraceOutput CodeTrace::SaveCurrentInstruction() const
TraceOutput CodeTrace::SaveCurrentInstruction(const Core::CPUThreadGuard* guard) const
{
auto& system = Core::System::GetInstance();
auto& ppc_state = system.GetPPCState();
// Quickly save instruction and memory target for fast logging.
TraceOutput output;
const std::string instr = PowerPC::debug_interface.Disassemble(ppc_state.pc);
const std::string instr = PowerPC::debug_interface.Disassemble(guard, ppc_state.pc);
output.instruction = instr;
output.address = ppc_state.pc;
@ -139,14 +139,15 @@ TraceOutput CodeTrace::SaveCurrentInstruction() const
return output;
}
AutoStepResults CodeTrace::AutoStepping(bool continue_previous, AutoStop stop_on)
AutoStepResults CodeTrace::AutoStepping(const Core::CPUThreadGuard& guard, bool continue_previous,
AutoStop stop_on)
{
AutoStepResults results;
if (!CPU::IsStepping() || m_recording)
if (m_recording)
return results;
TraceOutput pc_instr = SaveCurrentInstruction();
TraceOutput pc_instr = SaveCurrentInstruction(&guard);
const InstructionAttributes instr = GetInstructionAttributes(pc_instr);
// Not an instruction we should start autostepping from (ie branches).
@ -187,7 +188,6 @@ AutoStepResults CodeTrace::AutoStepping(bool continue_previous, AutoStop stop_on
else if (stop_on == AutoStop::Changed)
stop_condition = HitType::ACTIVE;
CPU::PauseAndLock(true, false);
PowerPC::breakpoints.ClearAllTemporary();
using clock = std::chrono::steady_clock;
clock::time_point timeout = clock::now() + std::chrono::seconds(4);
@ -199,7 +199,7 @@ AutoStepResults CodeTrace::AutoStepping(bool continue_previous, AutoStop stop_on
{
PowerPC::SingleStep();
pc_instr = SaveCurrentInstruction();
pc_instr = SaveCurrentInstruction(&guard);
hit = TraceLogic(pc_instr);
results.count += 1;
} while (clock::now() < timeout && hit < stop_condition &&
@ -210,7 +210,6 @@ AutoStepResults CodeTrace::AutoStepping(bool continue_previous, AutoStop stop_on
results.timed_out = true;
PowerPC::SetMode(old_mode);
CPU::PauseAndLock(false, false);
m_recording = false;
results.reg_tracked = m_reg_autotrack;