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Merge pull request #3439 from Sonicadvance1/allocate_first_4gb_of_64bit

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FEXLoader: Allocate the second 4GB of virtual memory when executing 32-bit
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Ryan Houdek 2024-02-26 18:46:22 -08:00 committed by GitHub
commit 0b34035085
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2 changed files with 14 additions and 0 deletions
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6
FEXCore/Source/Utils/Allocator.cpp
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@ -297,6 +297,12 @@ namespace FEXCore::Allocator {
if (c == ' ') {
STEAL_LOG("[%d] ParseEnd; RegionBegin: %016lX RegionEnd: %016lX\n", __LINE__, RegionBegin, RegionEnd);
if (RegionEnd >= End) {
// Early return if we are completely beyond the allocation space.
close(MapsFD);
return Regions;
}
State = ScanEnd;
// If the previous map's ending and the region we just parsed overlap the stack then we need to save the stack mapping.

8
Source/Tools/FEXLoader/FEXLoader.cpp
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@ -417,11 +417,17 @@ int main(int argc, char **argv, char **const envp) {
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
Base48Bit = FEXCore::Allocator::Steal48BitVA();
} else {
// Reserve [0x1_0000_0000, 0x2_0000_0000).
// Safety net if 32-bit address calculation overflows in to 64-bit range.
constexpr uint64_t First64BitAddr = 0x1'0000'0000ULL;
Low4GB = FEXCore::Allocator::StealMemoryRegion(First64BitAddr, First64BitAddr + First64BitAddr);
// Setup our userspace allocator
FEXCore::Allocator::SetupHooks();
Allocator = FEX::HLE::CreatePassthroughAllocator();
@ -580,6 +586,8 @@ int main(int argc, char **argv, char **const envp) {
FEXCore::Allocator::ClearHooks();
FEXCore::Allocator::ReclaimMemoryRegion(Base48Bit);
FEXCore::Allocator::ReclaimMemoryRegion(Low4GB);
// Allocator is now original system allocator
FEXCore::Telemetry::Shutdown(Program.ProgramName);
FEXCore::Profiler::Shutdown();