From 57ef8feddbfe820ac96ec6ff869dd025923c9764 Mon Sep 17 00:00:00 2001
From: apio <blobs.trading@gmail.com>
Date: Wed, 9 Nov 2022 11:38:40 +0100
Subject: [PATCH] libc: Add __cxa_atexit and __cxa_finalize

To support a C++ implementation :)
---
 libs/libc/src/cxxabi.cpp | 50 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 libs/libc/src/cxxabi.cpp

diff --git a/libs/libc/src/cxxabi.cpp b/libs/libc/src/cxxabi.cpp
new file mode 100644
index 00000000..47734a45
--- /dev/null
+++ b/libs/libc/src/cxxabi.cpp
@@ -0,0 +1,50 @@
+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];
+
+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;
+                }
+            }
+        }
+    }
+}
\ No newline at end of file