diff --git a/src/xenia/base/memory.h b/src/xenia/base/memory.h
index e1125a5e3..45471e50f 100644
--- a/src/xenia/base/memory.h
+++ b/src/xenia/base/memory.h
@@ -18,6 +18,7 @@
 
 #include "xenia/base/assert.h"
 #include "xenia/base/byte_order.h"
+#include "xenia/base/platform.h"
 
 namespace xe {
 namespace memory {
@@ -96,12 +97,21 @@ void AlignedFree(T* ptr) {
 #endif  // XE_COMPILER_MSVC
 }
 
+#if XE_PLATFORM_WIN32
+// HANDLE.
 typedef void* FileMappingHandle;
+constexpr FileMappingHandle kFileMappingHandleInvalid = nullptr;
+#else
+// File descriptor.
+typedef int FileMappingHandle;
+constexpr FileMappingHandle kFileMappingHandleInvalid = -1;
+#endif
 
 FileMappingHandle CreateFileMappingHandle(const std::filesystem::path& path,
                                           size_t length, PageAccess access,
                                           bool commit);
-void CloseFileMappingHandle(FileMappingHandle handle);
+void CloseFileMappingHandle(FileMappingHandle handle,
+                            const std::filesystem::path& path);
 void* MapFileView(FileMappingHandle handle, void* base_address, size_t length,
                   PageAccess access, size_t file_offset);
 bool UnmapFileView(FileMappingHandle handle, void* base_address, size_t length);
diff --git a/src/xenia/base/memory_posix.cc b/src/xenia/base/memory_posix.cc
index 8010e5f18..f2834fb9d 100644
--- a/src/xenia/base/memory_posix.cc
+++ b/src/xenia/base/memory_posix.cc
@@ -40,7 +40,13 @@ void* AllocFixed(void* base_address, size_t length,
                  AllocationType allocation_type, PageAccess access) {
   // mmap does not support reserve / commit, so ignore allocation_type.
   uint32_t prot = ToPosixProtectFlags(access);
-  return mmap(base_address, length, prot, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+  void* result = mmap(base_address, length, prot,
+                      MAP_PRIVATE | MAP_FIXED | MAP_ANONYMOUS, -1, 0);
+  if (result == MAP_FAILED) {
+    return nullptr;
+  } else {
+    return result;
+  }
 }
 
 bool DeallocFixed(void* base_address, size_t length,
@@ -80,25 +86,28 @@ FileMappingHandle CreateFileMappingHandle(const std::filesystem::path& path,
       assert_always();
       return nullptr;
   }
-
   oflag |= O_CREAT;
-  int ret = shm_open(path.c_str(), oflag, 0777);
-  if (ret > 0) {
-    ftruncate64(ret, length);
+  auto full_path = "/" / path;
+  int ret = shm_open(full_path.c_str(), oflag, 0777);
+  if (ret < 0) {
+    return kFileMappingHandleInvalid;
   }
-
-  return ret <= 0 ? nullptr : reinterpret_cast<FileMappingHandle>(ret);
+  ftruncate64(ret, length);
+  return ret;
 }
 
-void CloseFileMappingHandle(FileMappingHandle handle) {
-  close((intptr_t)handle);
+void CloseFileMappingHandle(FileMappingHandle handle,
+                            const std::filesystem::path& path) {
+  close(handle);
+  auto full_path = "/" / path;
+  shm_unlink(full_path.c_str());
 }
 
 void* MapFileView(FileMappingHandle handle, void* base_address, size_t length,
                   PageAccess access, size_t file_offset) {
   uint32_t prot = ToPosixProtectFlags(access);
-  return mmap64(base_address, length, prot, MAP_PRIVATE | MAP_ANONYMOUS,
-                reinterpret_cast<intptr_t>(handle), file_offset);
+  return mmap64(base_address, length, prot, MAP_PRIVATE | MAP_ANONYMOUS, handle,
+                file_offset);
 }
 
 bool UnmapFileView(FileMappingHandle handle, void* base_address,
diff --git a/src/xenia/base/memory_win.cc b/src/xenia/base/memory_win.cc
index 13b78a411..343285d94 100644
--- a/src/xenia/base/memory_win.cc
+++ b/src/xenia/base/memory_win.cc
@@ -147,12 +147,16 @@ FileMappingHandle CreateFileMappingHandle(const std::filesystem::path& path,
                                           bool commit) {
   DWORD protect =
       ToWin32ProtectFlags(access) | (commit ? SEC_COMMIT : SEC_RESERVE);
+  auto full_path = "Local" / path;
   return CreateFileMappingW(INVALID_HANDLE_VALUE, NULL, protect,
                             static_cast<DWORD>(length >> 32),
-                            static_cast<DWORD>(length), path.c_str());
+                            static_cast<DWORD>(length), full_path.c_str());
 }
 
-void CloseFileMappingHandle(FileMappingHandle handle) { CloseHandle(handle); }
+void CloseFileMappingHandle(FileMappingHandle handle,
+                            const std::filesystem::path& path) {
+  CloseHandle(handle);
+}
 
 void* MapFileView(FileMappingHandle handle, void* base_address, size_t length,
                   PageAccess access, size_t file_offset) {
diff --git a/src/xenia/base/testing/memory_test.cc b/src/xenia/base/testing/memory_test.cc
index 5433dc118..7a19a55a4 100644
--- a/src/xenia/base/testing/memory_test.cc
+++ b/src/xenia/base/testing/memory_test.cc
@@ -10,6 +10,9 @@
 #include "xenia/base/memory.h"
 
 #include "third_party/catch/include/catch.hpp"
+#include "third_party/fmt/include/fmt/format.h"
+
+#include "xenia/base/clock.h"
 
 namespace xe {
 namespace base {
@@ -414,6 +417,58 @@ TEST_CASE("copy_and_swap_16_in_32_unaligned", "Copy and Swap") {
   REQUIRE(true == true);
 }
 
+TEST_CASE("create_and_close_file_mapping", "Virtual Memory Mapping") {
+  auto path = fmt::format("xenia_test_{}", Clock::QueryHostTickCount());
+  auto memory = xe::memory::CreateFileMappingHandle(
+      path, 0x100, xe::memory::PageAccess::kReadWrite, true);
+  REQUIRE(memory != xe::memory::FileMappingHandleInvalid);
+  xe::memory::CloseFileMappingHandle(memory, path);
+}
+
+TEST_CASE("map_view", "Virtual Memory Mapping") {
+  auto path = fmt::format("xenia_test_{}", Clock::QueryHostTickCount());
+  const size_t length = 0x100;
+  auto memory = xe::memory::CreateFileMappingHandle(
+      path, length, xe::memory::PageAccess::kReadWrite, true);
+  REQUIRE(memory != xe::memory::FileMappingHandleInvalid);
+
+  uintptr_t address = 0x100000000;
+  auto view =
+      xe::memory::MapFileView(memory, reinterpret_cast<void*>(address), length,
+                              xe::memory::PageAccess::kReadWrite, 0);
+  REQUIRE(reinterpret_cast<uintptr_t>(view) == address);
+
+  xe::memory::UnmapFileView(memory, reinterpret_cast<void*>(address), length);
+  xe::memory::CloseFileMappingHandle(memory, path);
+}
+
+TEST_CASE("read_write_view", "Virtual Memory Mapping") {
+  const size_t length = 0x100;
+  auto path = fmt::format("xenia_test_{}", Clock::QueryHostTickCount());
+  auto memory = xe::memory::CreateFileMappingHandle(
+      path, length, xe::memory::PageAccess::kReadWrite, true);
+  REQUIRE(memory != xe::memory::FileMappingHandleInvalid);
+
+  uintptr_t address = 0x100000000;
+  auto view =
+      xe::memory::MapFileView(memory, reinterpret_cast<void*>(address), length,
+                              xe::memory::PageAccess::kReadWrite, 0);
+  REQUIRE(reinterpret_cast<uintptr_t>(view) == address);
+
+  for (uint32_t i = 0; i < length; i += sizeof(uint8_t)) {
+    auto p_value = reinterpret_cast<uint8_t*>(address + i);
+    *p_value = i;
+  }
+  for (uint32_t i = 0; i < length; i += sizeof(uint8_t)) {
+    auto p_value = reinterpret_cast<uint8_t*>(address + i);
+    uint8_t value = *p_value;
+    REQUIRE(value == i);
+  }
+
+  xe::memory::UnmapFileView(memory, reinterpret_cast<void*>(address), length);
+  xe::memory::CloseFileMappingHandle(memory, path);
+}
+
 }  // namespace test
 }  // namespace base
 }  // namespace xe
diff --git a/src/xenia/base/testing/threading_test.cc b/src/xenia/base/testing/threading_test.cc
index f8fae6339..ba6eda0db 100644
--- a/src/xenia/base/testing/threading_test.cc
+++ b/src/xenia/base/testing/threading_test.cc
@@ -813,7 +813,7 @@ TEST_CASE("Create and Run Thread", "Thread") {
   result = Wait(Thread::GetCurrentThread(), false, 50ms);
   REQUIRE(result == WaitResult::kTimeout);
 
-  params.stack_size = 16 * 1024;
+  params.stack_size = 16 * 1024 * 1024;
   thread = Thread::Create(params, [] {
     while (true) {
       Thread::Exit(-1);
diff --git a/src/xenia/base/threading_posix.cc b/src/xenia/base/threading_posix.cc
index 9e39b17a5..7194855f2 100644
--- a/src/xenia/base/threading_posix.cc
+++ b/src/xenia/base/threading_posix.cc
@@ -505,6 +505,7 @@ class PosixCondition<Thread> : public PosixConditionBase {
       }
     }
     if (pthread_create(&thread_, &attr, ThreadStartRoutine, start_data) != 0) {
+      pthread_attr_destroy(&attr);
       return false;
     }
     pthread_attr_destroy(&attr);
@@ -1006,7 +1007,10 @@ Thread* Thread::GetCurrentThread() {
   pthread_t handle = pthread_self();
 
   current_thread_ = new PosixThread(handle);
-  atexit([] { delete current_thread_; });
+  // TODO(bwrsandman): Disabling deleting thread_local current thread to prevent
+  //                   assert in destructor. Since this is thread local, the
+  //                   "memory leaking" is controlled.
+  // atexit([] { delete current_thread_; });
 
   return current_thread_;
 }
diff --git a/src/xenia/cpu/backend/x64/x64_code_cache.cc b/src/xenia/cpu/backend/x64/x64_code_cache.cc
index 8f9b433dd..d3b22d14c 100644
--- a/src/xenia/cpu/backend/x64/x64_code_cache.cc
+++ b/src/xenia/cpu/backend/x64/x64_code_cache.cc
@@ -40,11 +40,11 @@ X64CodeCache::~X64CodeCache() {
   }
 
   // Unmap all views and close mapping.
-  if (mapping_) {
+  if (mapping_ != xe::memory::kFileMappingHandleInvalid) {
     xe::memory::UnmapFileView(mapping_, generated_code_base_,
                               kGeneratedCodeSize);
-    xe::memory::CloseFileMappingHandle(mapping_);
-    mapping_ = nullptr;
+    xe::memory::CloseFileMappingHandle(mapping_, file_name_);
+    mapping_ = xe::memory::kFileMappingHandleInvalid;
   }
 }
 
@@ -63,12 +63,11 @@ bool X64CodeCache::Initialize() {
   }
 
   // Create mmap file. This allows us to share the code cache with the debugger.
-  file_name_ =
-      fmt::format("Local\\xenia_code_cache_{}", Clock::QueryHostTickCount());
+  file_name_ = fmt::format("xenia_code_cache_{}", Clock::QueryHostTickCount());
   mapping_ = xe::memory::CreateFileMappingHandle(
       file_name_, kGeneratedCodeSize, xe::memory::PageAccess::kExecuteReadWrite,
       false);
-  if (!mapping_) {
+  if (mapping_ == xe::memory::kFileMappingHandleInvalid) {
     XELOGE("Unable to create code cache mmap");
     return false;
   }
diff --git a/src/xenia/cpu/backend/x64/x64_code_cache.h b/src/xenia/cpu/backend/x64/x64_code_cache.h
index 1f1473094..9f7424ec8 100644
--- a/src/xenia/cpu/backend/x64/x64_code_cache.h
+++ b/src/xenia/cpu/backend/x64/x64_code_cache.h
@@ -100,7 +100,8 @@ class X64CodeCache : public CodeCache {
                          UnwindReservation unwind_reservation) {}
 
   std::filesystem::path file_name_;
-  xe::memory::FileMappingHandle mapping_ = nullptr;
+  xe::memory::FileMappingHandle mapping_ =
+      xe::memory::kFileMappingHandleInvalid;
 
   // NOTE: the global critical region must be held when manipulating the offsets
   // or counts of anything, to keep the tables consistent and ordered.
diff --git a/src/xenia/kernel/util/shim_utils.h b/src/xenia/kernel/util/shim_utils.h
index fcfc90d4d..126358b17 100644
--- a/src/xenia/kernel/util/shim_utils.h
+++ b/src/xenia/kernel/util/shim_utils.h
@@ -148,7 +148,7 @@ class Param {
 
  protected:
   Param() : ordinal_(-1) {}
-  explicit Param(Init& init) : ordinal_(--init.ordinal) {}
+  explicit Param(Init& init) : ordinal_(init.ordinal++) {}
 
   template <typename V>
   void LoadValue(Init& init, V* out_value) {
@@ -519,10 +519,13 @@ xe::cpu::Export* RegisterExport(R (*fn)(Ps&...), const char* name,
       ++export_entry->function_data.call_count;
       Param::Init init = {
           ppc_context,
-          sizeof...(Ps),
           0,
       };
-      auto params = std::make_tuple<Ps...>(Ps(init)...);
+      // Using braces initializer instead of make_tuple because braces
+      // enforce execution order across compilers.
+      // The make_tuple order is undefined per the C++ standard and
+      // cause inconsitencies between msvc and clang.
+      std::tuple<Ps...> params = {Ps(init)...};
       if (export_entry->tags & xe::cpu::ExportTag::kLog &&
           (!(export_entry->tags & xe::cpu::ExportTag::kHighFrequency) ||
            cvars::log_high_frequency_kernel_calls)) {
@@ -554,9 +557,13 @@ xe::cpu::Export* RegisterExport(void (*fn)(Ps&...), const char* name,
       ++export_entry->function_data.call_count;
       Param::Init init = {
           ppc_context,
-          sizeof...(Ps),
+          0,
       };
-      auto params = std::make_tuple<Ps...>(Ps(init)...);
+      // Using braces initializer instead of make_tuple because braces
+      // enforce execution order across compilers.
+      // The make_tuple order is undefined per the C++ standard and
+      // cause inconsitencies between msvc and clang.
+      std::tuple<Ps...> params = {Ps(init)...};
       if (export_entry->tags & xe::cpu::ExportTag::kLog &&
           (!(export_entry->tags & xe::cpu::ExportTag::kHighFrequency) ||
            cvars::log_high_frequency_kernel_calls)) {
diff --git a/src/xenia/memory.cc b/src/xenia/memory.cc
index 7e60797f5..f70e00f66 100644
--- a/src/xenia/memory.cc
+++ b/src/xenia/memory.cc
@@ -113,11 +113,11 @@ Memory::~Memory() {
   heaps_.physical.Dispose();
 
   // Unmap all views and close mapping.
-  if (mapping_) {
+  if (mapping_ != xe::memory::kFileMappingHandleInvalid) {
     UnmapViews();
-    xe::memory::CloseFileMappingHandle(mapping_);
+    xe::memory::CloseFileMappingHandle(mapping_, file_name_);
     mapping_base_ = nullptr;
-    mapping_ = nullptr;
+    mapping_ = xe::memory::kFileMappingHandleInvalid;
   }
 
   virtual_membase_ = nullptr;
@@ -125,8 +125,7 @@ Memory::~Memory() {
 }
 
 bool Memory::Initialize() {
-  file_name_ =
-      fmt::format("Local\\xenia_memory_{}", Clock::QueryHostTickCount());
+  file_name_ = fmt::format("xenia_memory_{}", Clock::QueryHostTickCount());
 
   // Create main page file-backed mapping. This is all reserved but
   // uncommitted (so it shouldn't expand page file).
@@ -134,9 +133,9 @@ bool Memory::Initialize() {
       file_name_,
       // entire 4gb space + 512mb physical:
       0x11FFFFFFF, xe::memory::PageAccess::kReadWrite, false);
-  if (!mapping_) {
+  if (mapping_ == xe::memory::kFileMappingHandleInvalid) {
     XELOGE("Unable to reserve the 4gb guest address space.");
-    assert_not_null(mapping_);
+    assert_always();
     return false;
   }
 
diff --git a/src/xenia/memory.h b/src/xenia/memory.h
index fa0c62f4c..df76c39bc 100644
--- a/src/xenia/memory.h
+++ b/src/xenia/memory.h
@@ -491,7 +491,8 @@ class Memory {
   uint8_t* virtual_membase_ = nullptr;
   uint8_t* physical_membase_ = nullptr;
 
-  xe::memory::FileMappingHandle mapping_ = nullptr;
+  xe::memory::FileMappingHandle mapping_ =
+      xe::memory::kFileMappingHandleInvalid;
   uint8_t* mapping_base_ = nullptr;
   union {
     struct {