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kern: optimize hw-single-step management

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Michael Scire 2021-07-27 14:05:32 -07:00 • committed by SciresM
parent 05ea0c53d7
commit 9e7b56b33c
7 changed files with 102 additions and 125 deletions
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48
libraries/libmesosphere/source/arch/arm64/kern_exception_handlers.cpp
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@ -109,6 +109,15 @@ namespace ams::kern::arch::arm64 {
break;
}
/* If we should, clear the thread's state as single-step. */
#if defined(MESOSPHERE_ENABLE_HARDWARE_SINGLE_STEP)
if (AMS_UNLIKELY(GetCurrentThread().IsSingleStep())) {
GetCurrentThread().ClearSingleStep();
cpu::MonitorDebugSystemControlRegisterAccessor().SetSoftwareStep(false).Store();
cpu::EnsureInstructionConsistency();
}
#endif
/* If we should process the user exception (and it's not a breakpoint), try to enter. */
const bool is_software_break = (ec == EsrEc_Unknown || ec == EsrEc_IllegalExecution || ec == EsrEc_BkptInstruction || ec == EsrEc_BrkInstruction);
const bool is_breakpoint = (ec == EsrEc_BreakPointEl0 || ec == EsrEc_SoftwareStepEl0 || ec == EsrEc_WatchPointEl0);
@ -290,16 +299,40 @@ namespace ams::kern::arch::arm64 {
return;
}
/* Print that an exception occurred. */
MESOSPHERE_RELEASE_LOG("Exception occurred. %016lx\n", GetCurrentProcess().GetProgramId());
#if defined(MESOSPHERE_ENABLE_HARDWARE_SINGLE_STEP)
{
/* Print the current thread's registers. */
KDebug::PrintRegister();
if (ec != EsrEc_SoftwareStepEl0) {
/* If the exception wasn't single-step, print details. */
MESOSPHERE_RELEASE_LOG("Exception occurred. %016lx\n", GetCurrentProcess().GetProgramId());
/* Print a backtrace. */
KDebug::PrintBacktrace();
{
/* Print the current thread's registers. */
KDebug::PrintRegister();
/* Print a backtrace. */
KDebug::PrintBacktrace();
}
} else {
/* If the exception was single-step and we have no debug object, we should just return. */
if (AMS_UNLIKELY(!cur_process.IsAttachedToDebugger())) {
return;
}
}
}
#else
{
/* Print that an exception occurred. */
MESOSPHERE_RELEASE_LOG("Exception occurred. %016lx\n", GetCurrentProcess().GetProgramId());
{
/* Print the current thread's registers. */
KDebug::PrintRegister();
/* Print a backtrace. */
KDebug::PrintBacktrace();
}
}
#endif
/* If the SVC is handled, handle it. */
if (!svc::ResultNotHandled::Includes(result)) {
@ -559,6 +592,7 @@ namespace ams::kern::arch::arm64 {
KDpcManager::HandleDpc();
}
}
/* Note that we're no longer in an exception handler. */
GetCurrentThread().ClearInExceptionHandler();
}