steam-frame/FEX-Emu--FEX
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DiskCache: detect inline data, hash around it and patch it on Lookup

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Only detect certain kinds of mov reg,immediate so far, which was the bulk of
Mono JIT activity.
This commit is contained in:
Pierre-Loup A. Griffais committed 2026-09-06 23:25:29 -07:00
1 parent 50e6eee95a
commit c92805475d
14 files changed
+210 -12
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FEXCore/Source/Interface/Core/CodeCache.cpp
+14 -3
View File
@@ -538,16 +538,22 @@ ApplyRIPMoveRelocation(ContextImpl& CTX, uint64_t GuestRIP, uint8_t RegisterInde
Emitter.LoadConstant(ARMEmitter::Size::i64Bit, ARMEmitter::Register(RegisterIndex), Pointer, CPU::Arm64Emitter::PadType::DOPAD);
}
static inline void ApplyPatchableDataRelocation(uint64_t SiteAddress, uint8_t ValueSize, uint8_t RegisterIndex, CPU::Arm64Emitter& Emitter) {
uint64_t Value = 0;
memcpy(&Value, reinterpret_cast<const void*>(SiteAddress), ValueSize);
Emitter.LoadConstant(ARMEmitter::Size::i64Bit, ARMEmitter::Register(RegisterIndex), Value, CPU::Arm64Emitter::PadType::DOPAD);
}
bool CodeCache::ApplyPackedCodeRelocations(uint64_t GuestEntry, std::span<std::byte> Code,
std::span<const DiskCache::BlobSmallRelocation> SmallRelocs,
std::span<const DiskCache::BlobThunkRelocation> ThunkRelocs, bool ForStorage) {
std::span<const DiskCache::BlobThunkRelocation> ThunkRelocs) {
CPU::Arm64Emitter Emitter(&CTX, Code.data(), Code.size_bytes());
for (auto& Reloc : SmallRelocs) {
LOGMAN_THROW_A_FMT(Reloc.Offset < Code.size_bytes(), "Invalid relocation offset");
Emitter.SetCursorOffset(Reloc.Offset);
switch ((CPU::RelocationTypes)Reloc.Type) {
case FEXCore::CPU::RelocationTypes::RELOC_NAMED_SYMBOL_LITERAL: {
ApplySymbolLiteralRelocation(CTX, (CPU::RelocNamedSymbolLiteral::NamedSymbol)Reloc.Named.Symbol, GuestEntry, Emitter, ForStorage);
ApplySymbolLiteralRelocation(CTX, (CPU::RelocNamedSymbolLiteral::NamedSymbol)Reloc.Named.Symbol, GuestEntry, Emitter, false);
break;
}
case FEXCore::CPU::RelocationTypes::RELOC_GUEST_RIP_LITERAL: {
@@ -558,13 +564,18 @@ bool CodeCache::ApplyPackedCodeRelocations(uint64_t GuestEntry, std::span<std::b
ApplyRIPMoveRelocation(CTX, Reloc.RIPMove.GuestRIP, Reloc.RIPMove.RegisterIndex, GuestEntry, Emitter);
break;
}
case FEXCore::CPU::RelocationTypes::RELOC_GUEST_PATCHABLE_DATA_MOVE: {
ApplyPatchableDataRelocation(GuestEntry + Reloc.PatchableData.SiteOffset, Reloc.PatchableData.ValueSize,
Reloc.PatchableData.RegisterIndex, Emitter);
break;
}
default: ERROR_AND_DIE_FMT("Unknown packed relocation type {}", ToUnderlying((CPU::RelocationTypes)Reloc.Type));
}
}
for (auto& Reloc : ThunkRelocs) {
LOGMAN_THROW_A_FMT(Reloc.Offset < Code.size_bytes(), "Invalid relocation offset");
Emitter.SetCursorOffset(Reloc.Offset);
if (!ApplyThunkMoveRelocation(CTX, (const IR::SHA256Sum*)Reloc.SymbolHash, Reloc.RegisterIndex, Emitter, ForStorage)) {
if (!ApplyThunkMoveRelocation(CTX, (const IR::SHA256Sum*)Reloc.SymbolHash, Reloc.RegisterIndex, Emitter, false)) {
return false;
}
}