Register __libc_fini as early as possible.

We want __libc_fini to be called after all the destructors.

Bug: 14611536
Change-Id: Ibb83a94436795ec178fd605fa531ac29608f4a3e

libc/arch-common/bionic/crtbegin.c

@@ -36,9 +36,6 @@ void (*__PREINIT_ARRAY__)(void) = (void (*)(void)) -1;
 __attribute__ ((section (".init_array")))
 void (*__INIT_ARRAY__)(void) = (void (*)(void)) -1;
 
-__attribute__ ((section (".fini_array")))
-void (*__FINI_ARRAY__)(void) = (void (*)(void)) -1;
-
 __LIBC_HIDDEN__
 #ifdef __i386__
 __attribute__((force_align_arg_pointer))
@@ -47,7 +44,6 @@ void _start() {
   structors_array_t array;
   array.preinit_array = &__PREINIT_ARRAY__;
   array.init_array = &__INIT_ARRAY__;
-  array.fini_array = &__FINI_ARRAY__;
 
   void* raw_args = (void*) ((uintptr_t) __builtin_frame_address(0) + sizeof(void*));
 #ifdef __x86_64__

libc/arch-mips/bionic/crtbegin.c

@@ -36,15 +36,11 @@ void (*__PREINIT_ARRAY__)(void) = (void (*)(void)) -1;
 __attribute__ ((section (".init_array")))
 void (*__INIT_ARRAY__)(void) = (void (*)(void)) -1;
 
-__attribute__ ((section (".fini_array")))
-void (*__FINI_ARRAY__)(void) = (void (*)(void)) -1;
-
 
 __LIBC_HIDDEN__  void do_mips_start(void *raw_args) {
   structors_array_t array;
   array.preinit_array = &__PREINIT_ARRAY__;
   array.init_array = &__INIT_ARRAY__;
-  array.fini_array = &__FINI_ARRAY__;
 
   __libc_init(raw_args, NULL, &main, &array);
 }

libc/arch-mips64/bionic/crtbegin.c

@@ -36,15 +36,10 @@ void (*__PREINIT_ARRAY__)(void) = (void (*)(void)) -1;
 __attribute__ ((section (".init_array")))
 void (*__INIT_ARRAY__)(void) = (void (*)(void)) -1;
 
-__attribute__ ((section (".fini_array")))
-void (*__FINI_ARRAY__)(void) = (void (*)(void)) -1;
-
-
 __LIBC_HIDDEN__  void do_mips_start(void *raw_args) {
   structors_array_t array;
   array.preinit_array = &__PREINIT_ARRAY__;
   array.init_array = &__INIT_ARRAY__;
-  array.fini_array = &__FINI_ARRAY__;
 
   __libc_init(raw_args, NULL, &main, &array);
 }

libc/bionic/libc_init_common.h

@@ -33,7 +33,6 @@
 typedef struct {
   void (**preinit_array)(void);
   void (**init_array)(void);
-  void (**fini_array)(void);
 } structors_array_t;
 
 __BEGIN_DECLS

libc/bionic/libc_init_dynamic.cpp

@@ -60,6 +60,9 @@ extern "C" {
   extern int __cxa_atexit(void (*)(void *), void *, void *);
 };
 
+__attribute__ ((section (".fini_array")))
+void (*__FINI_ARRAY__)(void) = (void (*)(void)) -1;
+
 // We flag the __libc_preinit function as a constructor to ensure
 // that its address is listed in libc.so's .init_array section.
 // This ensures that the function is called by the dynamic linker
@@ -79,6 +82,11 @@ __attribute__((constructor)) static void __libc_preinit() {
   // Hooks for various libraries to let them know that we're starting up.
   malloc_debug_init();
   netdClientInit();
+
+  // The executable may have its own destructors listed in its .fini_array
+  // so we need to ensure that these are called when the program exits
+  // normally.
+  __cxa_atexit(__libc_fini, &__FINI_ARRAY__, NULL);
 }
 
 __LIBC_HIDDEN__ void __libc_postfini() {
@@ -96,19 +104,11 @@ __LIBC_HIDDEN__ void __libc_postfini() {
 __noreturn void __libc_init(void* raw_args,
                             void (*onexit)(void) __unused,
                             int (*slingshot)(int, char**, char**),
-                            structors_array_t const * const structors) {
-
+                            structors_array_t const * const structors __unused) {
   KernelArgumentBlock args(raw_args);
 
   // Several Linux ABIs don't pass the onexit pointer, and the ones that
   // do never use it.  Therefore, we ignore it.
 
-  // The executable may have its own destructors listed in its .fini_array
-  // so we need to ensure that these are called when the program exits
-  // normally.
-  if (structors->fini_array) {
-    __cxa_atexit(__libc_fini,structors->fini_array,NULL);
-  }
-
   exit(slingshot(args.argc, args.argv, args.envp));
 }

libc/bionic/libc_init_static.cpp

@@ -61,6 +61,9 @@
 
 extern "C" int __cxa_atexit(void (*)(void *), void *, void *);
 
+__attribute__ ((section (".fini_array")))
+void (*__FINI_ARRAY__)(void) = (void (*)(void)) -1;
+
 static void call_array(void(**list)()) {
   // First element is -1, list is null-terminated
   while (*++list) {
@@ -99,14 +102,13 @@ __noreturn void __libc_init(void* raw_args,
   // do never use it.  Therefore, we ignore it.
 
   call_array(structors->preinit_array);
-  call_array(structors->init_array);
 
   // The executable may have its own destructors listed in its .fini_array
   // so we need to ensure that these are called when the program exits
   // normally.
-  if (structors->fini_array != NULL) {
-    __cxa_atexit(__libc_fini,structors->fini_array,NULL);
-  }
+  __cxa_atexit(__libc_fini,&__FINI_ARRAY__, NULL);
+
+  call_array(structors->init_array);
 
   exit(slingshot(args.argc, args.argv, args.envp));
 }