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arm64ec: Fixes some FEX allocations that were missing TOP_DOWN

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We were accidentally allocating some things without this flag and it was
causing us to dump memory in to the lower 32-bits on arm64ec.

This was causing the game
[Below](https://store.steampowered.com/app/250680/BELOW/) to run out of
memory to allocate for its LUA JIT and causes it to crash.
This commit is contained in:
Ryan Houdek committed 2026-05-29 16:17:04 -07:00
1 parent b754fe4810
commit 154ff43d7f
2 files changed
+5 -4
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Source/Windows/ARM64EC/Module.cpp
+3 -2
View File
@@ -619,7 +619,7 @@ NTSTATUS ProcessInit() {
CPUFeatures.emplace(*CTX);
X64ReturnInstr = ::VirtualAlloc(nullptr, FEXCore::Utils::FEX_PAGE_SIZE, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
X64ReturnInstr = ::VirtualAlloc(nullptr, FEXCore::Utils::FEX_PAGE_SIZE, MEM_COMMIT | MEM_TOP_DOWN, PAGE_EXECUTE_READWRITE);
InvalidationTracker->HandleMemoryProtectionNotification(reinterpret_cast<uint64_t>(X64ReturnInstr), FEXCore::Utils::FEX_PAGE_SIZE,
PAGE_EXECUTE_READ);
*reinterpret_cast<uint8_t*>(X64ReturnInstr) = 0xc3;
@@ -919,7 +919,8 @@ NTSTATUS ThreadInit() {
const auto CPUArea = GetCPUArea();
static constexpr size_t EmulatorStackSize = 0x40000;
const uint64_t EmulatorStack = reinterpret_cast<uint64_t>(::VirtualAlloc(nullptr, EmulatorStackSize, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE));
const uint64_t EmulatorStack =
reinterpret_cast<uint64_t>(::VirtualAlloc(nullptr, EmulatorStackSize, MEM_COMMIT | MEM_RESERVE | MEM_TOP_DOWN, PAGE_READWRITE));
CPUArea.EmulatorStackLimit() = EmulatorStack;
CPUArea.EmulatorStackBase() = EmulatorStack + EmulatorStackSize;