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WIP: DO-NOT-MERGE: NCE experiments: Ensure guest context reflects thread state during unlock

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MrPurple666 2025-04-01 03:19:09 -03:00
parent a15ab954c3
commit 6e6fae364f
1 changed files with 6 additions and 8 deletions
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14
src/core/arm/nce/arm_nce.cpp
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@ -185,6 +185,9 @@ void ArmNce::LockThread(Kernel::KThread* thread) {
void ArmNce::UnlockThread(Kernel::KThread* thread) { void ArmNce::UnlockThread(Kernel::KThread* thread) {
auto* thread_params = &thread->GetNativeExecutionParameters(); auto* thread_params = &thread->GetNativeExecutionParameters();
m_guest_ctx.tpidr_el0 = thread_params->tpidr_el0;
m_guest_ctx.tpidrro_el0 = thread_params->tpidrro_el0;
thread_params->native_context = nullptr;
UnlockThreadParameters(thread_params); UnlockThreadParameters(thread_params);
} }
@ -380,20 +383,15 @@ void ArmNce::SignalInterrupt(Kernel::KThread* thread) {
} }
void ArmNce::ClearInstructionCache() { void ArmNce::ClearInstructionCache() {
// Implement efficient cache clearing using compiler built-ins
#if defined(__GNUC__) || defined(__clang__) #if defined(__GNUC__) || defined(__clang__)
// Get current program counter
void* start = (void*)((uintptr_t)__builtin_return_address(0) & ~(uintptr_t)0xFFF); void* start = (void*)((uintptr_t)__builtin_return_address(0) & ~(uintptr_t)0xFFF);
void* end = (void*)((uintptr_t)start + 0x1000); // Clear one page void* end = (void*)((uintptr_t)start + 0x1000);
__builtin___clear_cache(static_cast<char*>(start), static_cast<char*>(end)); __builtin___clear_cache(static_cast<char*>(start), static_cast<char*>(end));
#endif #endif
// Ensure memory accesses are complete before clearing cache
std::atomic_thread_fence(std::memory_order_release);
#ifdef __aarch64__ #ifdef __aarch64__
asm volatile("dsb ish"); asm volatile("dsb ish" ::: "memory");
asm volatile("isb"); asm volatile("isb" ::: "memory");
#endif #endif
} }