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crossed page boundary now marked proper

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lizzie
2026-09-01 10:17:05 +00:00
parent e6e1bd374b
commit 21ca1564fd
1 changed files with 8 additions and 15 deletions
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src/core/arm/nce/arm_nce.cpp
+8 -15
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@@ -163,11 +163,11 @@ bool ArmNce::HandleGuestAccessFault(GuestContext* guest_ctx, void* raw_info, voi
auto& memory = guest_ctx->parent->m_running_thread->GetOwnerProcess()->GetMemory();
// Try to handle an invalid access.
// This computes the addr for the (first) page corresponding to the access
auto const acc_size = 16; // Max architectural access size
// Please note accesses can be wider than 16-bytes on some(which?) cases
// but this should handle **most** of the fragant issues with cases like 128-bit vector
// load/stores or GPU writes.
// Please note accesses can be wider than 16-bytes
// This should handle **most** of the fragant issues with cases like 128-bit vector
// ld/st or GPU writes.
// This computes the addr for the (first) page corresponding to the access (if not crossing)
auto const addr_c1 = Common::ProcessAddress(u64(info->si_addr) & ~Memory::YUZU_PAGEMASK);
if (!(acc_size > 1 && (addr_c1 & Memory::YUZU_PAGEMASK) + acc_size > Memory::YUZU_PAGESIZE)) {
if (memory.InvalidateNCE(addr_c1, Memory::YUZU_PAGESIZE))
@@ -175,18 +175,11 @@ bool ArmNce::HandleGuestAccessFault(GuestContext* guest_ctx, void* raw_info, voi
} else {
// Corresponds to the 2nd page, this means the access is split between two pages
auto const addr_c2 = (addr_c1 & ~Memory::YUZU_PAGEMASK) + Memory::YUZU_PAGESIZE;
// Heres the stupid part, how the fuck do we decide if either the first
// or second pages should be the ones to propagate the fault?
if (memory.InvalidateNCE(addr_c1, Memory::YUZU_PAGESIZE))
// we need both pages to successfully be invalidated -- otherwise we immediately
// fall down to the sad path
if (memory.InvalidateNCE(addr_c1, Memory::YUZU_PAGESIZE)
&& memory.InvalidateNCE(addr_c2, Memory::YUZU_PAGESIZE))
return true;
// ... well my solution is stupid, but basically we just ignore the second page
// IS THIS A REASONABLE SOLUTION? Absolutely. If we were to cross page boundaries
// we would need to fetch our stuff from **somewhere**, by then it would
// likely be too late to handle the "invalidate case".
//
// Or simply put, the architecture might expect us to invalidate the unaligned access
// this should especially reflect on any game that had unaligned issues with JIT before.
memory.InvalidateNCE(addr_c2, Memory::YUZU_PAGESIZE);
}
// We couldn't handle the access.
return HandleFailedGuestFault(guest_ctx, raw_info, raw_context);