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[nce] Added case for access fault handling to manage page edge cases

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This commit is contained in:
CamilleLaVey 2026-03-08 15:12:47 -04:00
parent 32e63b5fa2
commit 1bdedc17ad
1 changed files with 21 additions and 5 deletions
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26
src/core/arm/nce/arm_nce.cpp
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@ -43,6 +43,7 @@ fpsimd_context* GetFloatingPointState(mcontext_t& host_ctx) {
using namespace Common::Literals;
constexpr u32 StackSize = 128_KiB;
constexpr u64 SplitPageAccessWindow = 64;
} // namespace
@ -158,18 +159,33 @@ bool ArmNce::HandleGuestAlignmentFault(GuestContext* guest_ctx, void* raw_info,
}
bool ArmNce::HandleGuestAccessFault(GuestContext* guest_ctx, void* raw_info, void* raw_context) {
auto& host_ctx = static_cast<ucontext_t*>(raw_context)->uc_mcontext;
auto* fpctx = GetFloatingPointState(host_ctx);
auto* info = static_cast<siginfo_t*>(raw_info);
// Try to handle an invalid access.
// TODO: handle accesses which split a page?
const Common::ProcessAddress addr =
(reinterpret_cast<u64>(info->si_addr) & ~Memory::YUZU_PAGEMASK);
const u64 fault_addr = reinterpret_cast<u64>(info->si_addr);
const Common::ProcessAddress addr = fault_addr & ~Memory::YUZU_PAGEMASK;
const u64 page_offset = fault_addr & Memory::YUZU_PAGEMASK;
auto& memory = guest_ctx->parent->m_running_thread->GetOwnerProcess()->GetMemory();
if (memory.InvalidateNCE(addr, Memory::YUZU_PAGESIZE)) {
bool handled = memory.InvalidateNCE(addr, Memory::YUZU_PAGESIZE);
if (page_offset < SplitPageAccessWindow && addr >= Memory::YUZU_PAGESIZE) {
handled |= memory.InvalidateNCE(addr - Memory::YUZU_PAGESIZE, Memory::YUZU_PAGESIZE);
}
if (page_offset + SplitPageAccessWindow > Memory::YUZU_PAGESIZE) {
handled |= memory.InvalidateNCE(addr + Memory::YUZU_PAGESIZE, Memory::YUZU_PAGESIZE);
}
if (handled) {
// We handled the access successfully and are returning to guest code.
return true;
}
if (auto next_pc = MatchAndExecuteOneInstruction(memory, &host_ctx, fpctx); next_pc) {
host_ctx.pc = *next_pc;
return true;
}
// We couldn't handle the access.
return HandleFailedGuestFault(guest_ctx, raw_info, raw_context);
}