Kernel: Add __cxa_atexit and __cxa_finalize

kernel/src/misc/cxxabi.cpp

@@ -0,0 +1,52 @@
+typedef void* (*cxa_atexit_func_t)(void*);
+
+struct cxa_atexit_entry
+{
+    cxa_atexit_func_t function;
+    void* argument;
+    void* dso_handle;
+};
+
+#define CXA_ATEXIT_MAX 64
+
+int cxa_atexit_entry_count = 0;
+
+cxa_atexit_entry cxa_atexit_entries[CXA_ATEXIT_MAX];
+
+__attribute__((visibility("hidden"))) void* __dso_handle = 0;
+
+extern "C"
+{
+    int __cxa_atexit(cxa_atexit_func_t func, void* arg, void* dso)
+    {
+        if (cxa_atexit_entry_count >= CXA_ATEXIT_MAX) return -1;
+        cxa_atexit_entries[cxa_atexit_entry_count].function = func;
+        cxa_atexit_entries[cxa_atexit_entry_count].argument = arg;
+        cxa_atexit_entries[cxa_atexit_entry_count].dso_handle = dso;
+        cxa_atexit_entry_count++;
+        return 0;
+    }
+
+    void __cxa_finalize(void* f)
+    {
+        int i = cxa_atexit_entry_count;
+        if (!f)
+        {
+            while (i--)
+            {
+                if (cxa_atexit_entries[i].function) { cxa_atexit_entries[i].function(cxa_atexit_entries[i].argument); }
+            }
+        }
+        else
+        {
+            while (i--)
+            {
+                if (cxa_atexit_entries[i].function == (cxa_atexit_func_t)f)
+                {
+                    cxa_atexit_entries[i].function(cxa_atexit_entries[i].argument);
+                    cxa_atexit_entries[i].function = 0;
+                }
+            }
+        }
+    }
+}