am 5c106fca: Merge change 1852 into donut

Merge commit '5c106fcaa5b9d0a3ebeb2e8cdca589129d6a7ebd'

* commit '5c106fcaa5b9d0a3ebeb2e8cdca589129d6a7ebd':
  Fix __eabi_atexit() implementation, as well as a bug in the BSD-originated __cxa_finalize() implementation

2 files changed, 18 insertions, 2 deletions

diff --git a/libc/bionic/eabi.c b/libc/bionic/eabi.c
index 2e0c99c..a5f6627 100644
--- a/libc/bionic/eabi.c
+++ b/libc/bionic/eabi.c
@@ -32,13 +32,20 @@ extern int  __cxa_atexit(void (*)(void*), void*, void* );
 
 void* __dso_handle = 0;
 
+/* The "C++ ABI for ARM" document states that static C++ constructors,
+ * which are called from the .init_array, should manually call
+ * __aeabi_atexit() to register static destructors explicitely.
+ *
+ * Note that 'dso_handle' is the address of a magic linker-generate
+ * variable from the shared object that contains the constructor/destructor
+ */
+
 /* Make this a weak symbol to avoid a multiple definition error when linking
  * with libstdc++-v3.  */
 int __attribute__((weak))
 __aeabi_atexit (void *object, void (*destructor) (void *), void *dso_handle)
 {
-    return 0;
-    //return __cxa_atexit(destructor, object, dso_handle);
+    return __cxa_atexit(destructor, object, dso_handle);
 }
 
 
diff --git a/libc/stdlib/atexit.c b/libc/stdlib/atexit.c
index 5bf82ba..4ba2177 100644
--- a/libc/stdlib/atexit.c
+++ b/libc/stdlib/atexit.c
@@ -147,10 +147,19 @@ __cxa_finalize(void *dso)
 				p->fns[n].fn_ptr.cxa_func = NULL;
 				mprotect(p, pgsize, PROT_READ);
 			}
+#if ANDROID
+                        /* it looks like we should always call the function
+                         * with an argument, even if dso is not NULL. Otherwise
+                         * static destructors will not be called properly on
+                         * the ARM.
+                         */
+                        (*fn.fn_ptr.cxa_func)(fn.fn_arg);
+#else /* !ANDROID */
 			if (dso != NULL)
 				(*fn.fn_ptr.cxa_func)(fn.fn_arg);
 			else
 				(*fn.fn_ptr.std_func)();
+#endif /* !ANDROID */
 		}
 	}