Move m68k from ports to libc

sysdeps/unix/sysv/linux/m68k/____longjmp_chk.c

@@ -0,0 +1,38 @@
+/* Copyright (C) 2009-2014 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library.  If not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <stdio.h>
+#include <signal.h>
+#include <sysdep.h>
+#define __longjmp ____longjmp_chk
+#define CHECK_SP(sp)							      \
+  do {									      \
+    register unsigned long this_sp asm ("sp");				      \
+    if ((unsigned long) (sp) < this_sp)					      \
+      {									      \
+	struct sigaltstack oss;						      \
+	INTERNAL_SYSCALL_DECL (err);					      \
+	int result = INTERNAL_SYSCALL (sigaltstack, err, 2, NULL, &oss);      \
+	if (!INTERNAL_SYSCALL_ERROR_P (result, err)			      \
+	    && ((oss.ss_flags & SS_ONSTACK) == 0			      \
+		|| ((unsigned long) oss.ss_sp + oss.ss_size		      \
+		    - (unsigned long) (sp)) < oss.ss_size))		      \
+	  __fortify_fail ("longjmp causes uninitialized stack frame");	      \
+      }									      \
+  } while (0)
+
+#include <__longjmp.c>