[Kernel] Revert Guest->Host Object Mapping

src/xenia/kernel/kernel_state.h

@@ -109,6 +109,7 @@ struct X_UNKNOWN_TYPE_REFED {
       points_to_prior;  // points to the previous field, which points to itself
 };
 static_assert_size(X_UNKNOWN_TYPE_REFED, 16);
+
 struct KernelGuestGlobals {
   X_OBJECT_TYPE ExThreadObjectType;
   X_OBJECT_TYPE ExEventObjectType;

src/xenia/kernel/util/kernel_fwd.h

@@ -17,6 +17,7 @@ struct XAPC;
 
 struct X_KPCR;
 struct X_KTHREAD;
+struct X_OBJECT_HEADER;
 struct X_OBJECT_CREATE_INFORMATION;
 
 }  // namespace xe::kernel

src/xenia/kernel/util/object_table.cc

@@ -479,44 +479,6 @@ X_STATUS ObjectTable::RestoreHandle(X_HANDLE handle, XObject* object) {
   return X_STATUS_SUCCESS;
 }
 
-void ObjectTable::MapGuestObjectToHostHandle(uint32_t guest_object,
-                                             X_HANDLE host_handle) {
-  auto global_lock = global_critical_region_.Acquire();
-  guest_to_host_handle_[guest_object] = host_handle;
-}
-bool ObjectTable::HostHandleForGuestObject(uint32_t guest_object, X_HANDLE& out) {
-  auto global_lock = global_critical_region_.Acquire();
-  auto gobj_iter = guest_to_host_handle_.find(guest_object);
-  if (gobj_iter == guest_to_host_handle_.end()) {
-    return false;
-  }
-  out = gobj_iter->second;
-  return true;
-}
-
-void ObjectTable::UnmapGuestObjectHostHandle(uint32_t guest_object) {
-  auto global_lock = global_critical_region_.Acquire();
-  auto iter = guest_to_host_handle_.find(guest_object);
-  if (iter == guest_to_host_handle_.end()) {
-    return;
-  } else {
-    guest_to_host_handle_.erase(iter);
-  }
-}
-void ObjectTable::FlushGuestToHostMapping(uint32_t base_address,
-                                          uint32_t length) {
-  auto global_lock = global_critical_region_.Acquire();
-  auto iterator = guest_to_host_handle_.lower_bound(base_address);
-
-  while (iterator !=guest_to_host_handle_.end() && iterator->first >= base_address && iterator->first < (base_address + length)) {
-    auto old_mapping = iterator;
-
-    iterator++;
-    auto node_handle = guest_to_host_handle_.extract(old_mapping);
-
-  }
-}
-
 }  // namespace util
 }  // namespace kernel
 }  // namespace xe

src/xenia/kernel/util/object_table.h

@@ -80,10 +80,6 @@ class ObjectTable {
   std::vector<object_ref<XObject>> GetAllObjects();
   void PurgeAllObjects();  // Purges the object table of all guest objects
 
-  void MapGuestObjectToHostHandle(uint32_t guest_object, X_HANDLE host_handle);
-  void UnmapGuestObjectHostHandle(uint32_t guest_object);
-  bool HostHandleForGuestObject(uint32_t guest_object, X_HANDLE& out);
-  void FlushGuestToHostMapping(uint32_t base_address, uint32_t length);
  private:
   struct ObjectTableEntry {
     int handle_ref_count = 0;
@@ -111,7 +107,6 @@ class ObjectTable {
   uint32_t last_free_entry_ = 0;
   uint32_t last_free_host_entry_ = 0;
   std::unordered_map<string_key_case, X_HANDLE> name_table_;
-  std::map<uint32_t, X_HANDLE> guest_to_host_handle_;
 };
 
 // Generic lookup

src/xenia/kernel/xobject.cc

@@ -55,10 +55,14 @@ XObject::~XObject() {
   assert_zero(pointer_ref_count_);
 
   if (allocated_guest_object_) {
-    kernel_state()->object_table()->UnmapGuestObjectHostHandle(
-        guest_object_ptr_);
+    uint32_t ptr = guest_object_ptr_ - sizeof(X_OBJECT_HEADER);
+    auto header = memory()->TranslateVirtual<X_OBJECT_HEADER*>(ptr);
+
+    // Free the object creation info
+    if (header->object_type_ptr) {
+      memory()->SystemHeapFree(header->object_type_ptr);
+    }
 
-    const uint32_t ptr = guest_object_ptr_ - sizeof(X_OBJECT_HEADER);
     memory()->SystemHeapFree(ptr);
   }
 }
@@ -323,14 +327,12 @@ uint8_t* XObject::CreateNative(uint32_t size) {
   SetNativePointer(mem + sizeof(X_OBJECT_HEADER), true);
 
   auto header = memory()->TranslateVirtual<X_OBJECT_HEADER*>(mem);
-  header->flags = OBJECT_HEADER_IS_TITLE_OBJECT;
-  header->pointer_count = 1;
-  header->handle_count = 0;
 
-  // Added to prevent having nullptr crashes on semaphore.
-  // This should probably work differently, but for now it is good enough (hopefully).
   auto object_type = memory()->SystemHeapAlloc(sizeof(X_OBJECT_TYPE));
   if (object_type) {
+    // Set it up in the header.
+    // Some kernel method is accessing this struct and dereferencing a member
+    // @ offset 0x14
     header->object_type_ptr = object_type;
   }
 
@@ -343,8 +345,17 @@ void XObject::SetNativePointer(uint32_t native_ptr, bool uninitialized) {
   // If hit: We've already setup the native ptr with CreateNative!
   assert_zero(guest_object_ptr_);
 
-  kernel_state()->object_table()->MapGuestObjectToHostHandle(native_ptr,
-                                                             handle());
+  auto header =
+      kernel_state_->memory()->TranslateVirtual<X_DISPATCH_HEADER*>(native_ptr);
+
+  // Memory uninitialized, so don't bother with the check.
+  if (!uninitialized) {
+    assert_true(!(header->wait_list_blink & 0x1));
+  }
+
+  // Stash pointer in struct.
+  // FIXME: This assumes the object has a dispatch header (some don't!)
+  StashHandle(header, handle());
 
   guest_object_ptr_ = native_ptr;
 }
@@ -362,8 +373,6 @@ object_ref<XObject> XObject::GetNativeObject(KernelState* kernel_state,
   // each time.
   // We identify this by setting wait_list_flink to a magic value. When set,
   // wait_list_blink will hold a handle to our object.
-
-  auto guest_ptr = kernel_state->memory()->HostToGuestVirtual(native_ptr);
   if (!already_locked) {
     global_critical_region::mutex().lock();
   }
@@ -375,14 +384,11 @@ object_ref<XObject> XObject::GetNativeObject(KernelState* kernel_state,
     as_type = header->type;
   }
 
-  X_HANDLE host_handle;
-  
-  if (kernel_state->object_table()->HostHandleForGuestObject(guest_ptr, host_handle)) {
+  if (header->wait_list_flink == kXObjSignature) {
     // Already initialized.
     // TODO: assert if the type of the object != as_type
-    result = kernel_state->object_table()
-                 ->LookupObject<XObject>(host_handle, true)
-                 .release();
+    uint32_t handle = header->wait_list_blink;
+    result = kernel_state->object_table()->LookupObject<XObject>(handle, true).release();
   } else {
     // First use, create new.
     // https://www.nirsoft.net/kernel_struct/vista/KOBJECTS.html
@@ -426,12 +432,10 @@ object_ref<XObject> XObject::GetNativeObject(KernelState* kernel_state,
         assert_always();
         result = nullptr;
     }
-
-    if (object) {
-      kernel_state->object_table()->MapGuestObjectToHostHandle(
-          guest_ptr, object->handle());
-      result = object;
-    }
+    // Stash pointer in struct.
+    // FIXME: This assumes the object contains a dispatch header (some don't!)
+    StashHandle(header, object->handle());
+    result = object;
   }
 
   if (!already_locked) {

src/xenia/kernel/xobject.h

@@ -62,6 +62,28 @@ typedef struct {
 } X_DISPATCH_HEADER;
 static_assert_size(X_DISPATCH_HEADER, 0x10);
 
+// https://www.nirsoft.net/kernel_struct/vista/OBJECT_HEADER.html
+struct X_OBJECT_HEADER {
+  xe::be<uint32_t> pointer_count;
+  union {
+    xe::be<uint32_t> handle_count;
+    xe::be<uint32_t> next_to_free;
+  };
+  uint8_t name_info_offset;
+  uint8_t handle_info_offset;
+  uint8_t quota_info_offset;
+  uint8_t flags;
+  union {
+    xe::be<uint32_t> object_create_info;  // X_OBJECT_CREATE_INFORMATION
+    xe::be<uint32_t> quota_block_charged;
+  };
+  xe::be<uint32_t> object_type_ptr;  // -0x8 POBJECT_TYPE
+  xe::be<uint32_t> unk_04;           // -0x4
+
+  // Object lives after this header.
+  // (There's actually a body field here which is the object itself)
+};
+
 // https://www.nirsoft.net/kernel_struct/vista/OBJECT_CREATE_INFORMATION.html
 struct X_OBJECT_CREATE_INFORMATION {
   xe::be<uint32_t> attributes;                  // 0x0
@@ -219,6 +241,12 @@ class XObject {
     return reinterpret_cast<T*>(CreateNative(sizeof(T)));
   }
 
+  // Stash native pointer into X_DISPATCH_HEADER
+  static void StashHandle(X_DISPATCH_HEADER* header, uint32_t handle) {
+    header->wait_list_flink = kXObjSignature;
+    header->wait_list_blink = handle;
+  }
+
   static uint32_t TimeoutTicksToMs(int64_t timeout_ticks);
 
   KernelState* kernel_state_;

src/xenia/xbox.h

@@ -323,19 +323,6 @@ enum X_OBJECT_HEADER_FLAGS : uint16_t {
 
 };
 
-// https://www.nirsoft.net/kernel_struct/vista/OBJECT_HEADER.html
-struct X_OBJECT_HEADER {
-  xe::be<uint32_t> pointer_count;
-  xe::be<uint32_t> handle_count;
-  xe::be<uint32_t> object_type_ptr;  // -0x8 POBJECT_TYPE
-  xe::be<uint16_t> flags;
-  uint8_t unknownE;
-  uint8_t unknownF;
-  // Object lives after this header.
-  // (There's actually a body field here which is the object itself)
-};
-static_assert_size(X_OBJECT_HEADER, 0x10);
-
 struct X_OBJECT_DIRECTORY {
   // each is a pointer to X_OBJECT_HEADER_NAME_INFO
   // i believe offset 0 = pointer to next in bucket
@@ -351,11 +338,13 @@ struct X_OBJECT_HEADER_NAME_INFO {
   xe::be<uint32_t> object_directory;  // pointer to X_OBJECT_DIRECTORY
   X_ANSI_STRING name;
 };
+
 struct X_OBJECT_ATTRIBUTES {
   xe::be<uint32_t> root_directory;  // 0x0
   xe::be<uint32_t> name_ptr;        // 0x4 PANSI_STRING
   xe::be<uint32_t> attributes;      // 0xC
 };
+
 struct X_OBJECT_TYPE {
   xe::be<uint32_t> allocate_proc;  // 0x0
   xe::be<uint32_t> free_proc;      // 0x4