hppa: Add ____longjmp_check C implementation.

ports/sysdeps/unix/sysv/linux/hppa/____longjmp_chk.c

@@ -0,0 +1,47 @@
+/* Copyright (C) 2009-2012 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 General Public License
+   along with GCC; see the file COPYING.  If not, write to the Free
+   Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
+   02110-1301, USA.  */
+
+#include <stdio.h>
+#include <signal.h>
+#include <sysdep.h>
+#define __longjmp ____longjmp_chk
+#define CHECK_SP(sp)							\
+  do {									\
+    register unsigned long this_sp asm ("r30");				\
+    /* The stack grows up, therefore frames that were created and then	\
+       destroyed must all have stack values higher than ours.  */	\
+    if ((unsigned long) (sp) > this_sp)					\
+      {									\
+        struct sigaltstack oss;						\
+        INTERNAL_SYSCALL_DECL (err);					\
+        int result = INTERNAL_SYSCALL (sigaltstack, err, 2, NULL, &oss);\
+	/* If we aren't using an alternate stack then we have already	\
+	   shown that we are jumping to a frame that doesn't exist so	\
+	   error out. If we are using an alternate stack we must prove	\
+	   that we are jumping *out* of the alternate stack. Note that	\
+	   the check for that is the same as that for _STACK_GROWS_UP	\
+	   as for _STACK_GROWS_DOWN.  */				\
+        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>