commit 33a209e57595fbb7934fcc4606d2b0dd0de688ad
author Pavel Chupin <pavel.v.chupin@intel.com> Mon Oct 21 20:20:53 2013 +0400
committer Elliott Hughes <enh@google.com> Mon Oct 21 17:36:28 2013 -0700
tree 6616eec2a39fbe149e5ea794484299aead39a6ad
parent f4ac8ba566d80679ccc346b3b0af4b46d394319b

Fix 16-byte stack alignment requirement for x86_64 ABI

Change-Id: I43304803ac54c8688c61688bd96c7160614172d4
Signed-off-by: Pavel Chupin <pavel.v.chupin@intel.com>

libc/arch-common/bionic/crtbegin.c

diff --git a/libc/arch-common/bionic/crtbegin.c b/libc/arch-common/bionic/crtbegin.c
index bc67bfb..fa9f3f3 100644
--- a/libc/arch-common/bionic/crtbegin.c
+++ b/libc/arch-common/bionic/crtbegin.c
@@ -50,6 +50,10 @@
   array.fini_array = &__FINI_ARRAY__;
 
   void* raw_args = (void*) ((uintptr_t) __builtin_frame_address(0) + sizeof(void*));
+#ifdef __x86_64__
+  // 16-byte stack alignment is required by x86_64 ABI
+  asm("andq  $~15, %rsp");
+#endif
   __libc_init(raw_args, NULL, &main, &array);
 }