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Merge pull request #4273 from bylaws/earlyend

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Frontend: End multiblocks early after hitting 2 consecutive null bytes
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Alyssa Rosenzweig authored and GitHub committed 2025-01-14 12:34:25 -05:00
2 parents a52dd71e44 643750817a
commit 48c03d747a
1 file changed
+6
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FEXCore/Source/Interface/Core/Frontend.cpp
+6
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@@ -1104,6 +1104,12 @@ void Decoder::DecodeInstructionsAtEntry(const uint8_t* _InstStream, uint64_t PC,
auto OpMinPage = OpMinAddress & FEXCore::Utils::FEX_PAGE_MASK;
auto OpMaxPage = OpMaxAddress & FEXCore::Utils::FEX_PAGE_MASK;
if (!EntryBlock && OpMinPage == OpMaxPage && PeekByte(0) == 0 && PeekByte(1) == 0) [[unlikely]] {
// End the multiblock early if we hit 2 consecutive null bytes (add [rax], al) in the same page with the
// assumption we are most likely trying to explore garbage code.
break;
}
if (OpMinPage != CurrentCodePage) {
CurrentCodePage = OpMinPage;
CodePages.insert(CurrentCodePage);