Allocator: Still need to return memory regions to frontend

FEXCore/Source/Utils/Allocator.cpp

@@ -304,10 +304,10 @@ fextl::vector<MemoryRegion> StealMemoryRegion(uintptr_t Begin, uintptr_t End) {
   return Regions;
 }
 
-void Setup48BitAllocatorIfExists() {
+fextl::vector<MemoryRegion> Setup48BitAllocatorIfExists() {
   size_t Bits = FEXCore::Allocator::DetermineVASize();
   if (Bits < 48) {
-    return;
+    return {};
   }
 
   uintptr_t Begin48BitVA = 0x0'8000'0000'0000ULL;
@@ -316,6 +316,8 @@ void Setup48BitAllocatorIfExists() {
 
   Alloc64 = Alloc::OSAllocator::Create64BitAllocatorWithRegions(Regions);
   AssignHookOverrides();
+
+  return Regions;
 }
 
 void ReclaimMemoryRegion(const fextl::vector<MemoryRegion>& Regions) {

FEXCore/include/FEXCore/Utils/Allocator.h

@@ -86,7 +86,7 @@ FEX_DEFAULT_VISIBILITY void ReclaimMemoryRegion(const fextl::vector<MemoryRegion
 // AArch64 canonical addresses are only up to bits 48/52 with the remainder being other things
 // Use this to reserve the top 128TB of VA so the guest never see it
 // Returns nullptr on host VA < 48bits
-FEX_DEFAULT_VISIBILITY void Setup48BitAllocatorIfExists();
+FEX_DEFAULT_VISIBILITY fextl::vector<MemoryRegion> Setup48BitAllocatorIfExists();
 
 #ifndef _WIN32
 FEX_DEFAULT_VISIBILITY void RegisterTLSData(FEXCore::Core::InternalThreadState* Thread);

Source/Tools/FEXLoader/FEXLoader.cpp

@@ -491,11 +491,12 @@ int main(int argc, char** argv, char** const envp) {
   FEXCore::Config::EraseSet(FEXCore::Config::CONFIG_IS64BIT_MODE, Loader.Is64BitMode() ? "1" : "0");
 
   fextl::unique_ptr<FEX::HLE::MemAllocator> Allocator;
+  fextl::vector<FEXCore::Allocator::MemoryRegion> Base48Bit;
   fextl::vector<FEXCore::Allocator::MemoryRegion> Low4GB;
 
   if (Loader.Is64BitMode()) {
     // Destroy the 48th bit if it exists
-    FEXCore::Allocator::Setup48BitAllocatorIfExists();
+    Base48Bit = FEXCore::Allocator::Setup48BitAllocatorIfExists();
   } else {
     // Reserve [0x1_0000_0000, 0x2_0000_0000).
     // Safety net if 32-bit address calculation overflows in to 64-bit range.
@@ -684,6 +685,7 @@ int main(int argc, char** argv, char** const envp) {
   LogMan::Msg::UnInstallHandler();
 
   FEXCore::Allocator::ClearHooks();
+  FEXCore::Allocator::ReclaimMemoryRegion(Base48Bit);
   FEXCore::Allocator::ReclaimMemoryRegion(Low4GB);
 
   // Allocator is now original system allocator