1 files changed, 98 insertions, 0 deletions
diff --git a/sysdeps/generic/bp-checks.h b/sysdeps/generic/bp-checks.h
new file mode 100644
index 0000000000..a7c54b4955
--- /dev/null
+++ b/sysdeps/generic/bp-checks.h
@@ -0,0 +1,98 @@
+/* Bounded-pointer checking macros for C.
+   Copyright (C) 2000 Free Software Foundation, Inc.
+   Contributed by Greg McGary <greg@mcgary.org>
+
+   This file is part of the GNU C Library.  Its master source is NOT part of
+   the C library, however.  The master source lives in the GNU MP Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#ifndef _bp_checks_h_
+# define _bp_checks_h_ 1
+
+# if !__ASSEMBLER__
+
+#  if __BOUNDED_POINTERS__
+
+/* GKM FIXME: when gcc is ready, add real bounds checks */
+#   define BOUNDS_VIOLATED (__builtin_trap (), 0)
+extern int __ubp_memchr (const char *__unbounded, int, unsigned);
+
+/* Verify that pointer's value >= low.  Return pointer value.  */
+#   define CHECK_BOUNDS_LOW(ARG)				\
+  (((__ptrvalue (ARG) < __ptrlow (ARG)) && BOUNDS_VIOLATED),	\
+   __ptrvalue (ARG))
+
+/* Verify that pointer's value < high.  Return pointer value.  */
+#   define CHECK_BOUNDS_HIGH(ARG)				\
+  (((__ptrvalue (ARG) > __ptrhigh (ARG)) && BOUNDS_VIOLATED),	\
+   __ptrvalue (ARG))
+
+/* Check bounds of a pointer seated to a single object.  */
+#   define CHECK_1(ARG) CHECK_N ((ARG), 1)
+
+/* Same as CHECK_1, but tolerate ARG == NULL.  */
+#   define CHECK_1opt(ARG) CHECK_Nopt ((ARG), 1)
+
+/* Check bounds of a pointer seated to an array of N objects.  */
+#   define CHECK_N(ARG, N)				\
+  (((__ptrvalue (ARG) < __ptrlow (ARG)			\
+     || __ptrvalue (ARG) + (N) > __ptrhigh (ARG))	\
+    && BOUNDS_VIOLATED), __ptrvalue (ARG))
+
+/* Same as CHECK_N, but tolerate ARG == NULL.  */
+#   define CHECK_Nopt(ARG, N)				\
+  (((__ptrvalue (ARG)					\
+     && (__ptrvalue (ARG) < __ptrlow (ARG)		\
+	 || __ptrvalue (ARG) + (N) > __ptrhigh (ARG)))	\
+    && BOUNDS_VIOLATED), __ptrvalue (ARG))
+
+/* Check for NUL-terminator within string's bounds.  */
+#   define CHECK_STRING(ARG)					\
+  (((__ptrvalue (ARG) < __ptrlow (ARG)				\
+     || !__ubp_memchr (__ptrvalue (ARG), '\0',			\
+		       (__ptrhigh (ARG) - __ptrvalue (ARG))))	\
+     && BOUNDS_VIOLATED),					\
+   __ptrvalue (ARG))
+
+#  else /* !__BOUNDED_POINTERS__ */
+
+/* Do nothing if not compiling with -fbounded-pointers.  */
+
+#   define BOUNDS_VIOLATED
+#   define CHECK_BOUNDS_LOW(ARG) (ARG)
+#   define CHECK_BOUNDS_HIGH(ARG) (ARG)
+#   define CHECK_1(ARG) (ARG)
+#   define CHECK_1opt(ARG) (ARG)
+#   define CHECK_N(ARG, N) (ARG)
+#   define CHECK_Nopt(ARG, N) (ARG)
+#   define CHECK_STRING(ARG) (ARG)
+
+#  endif /* !__BOUNDED_POINTERS__ */
+
+#  if defined (_IOC_SIZESHIFT) && defined (_IOC_SIZEBITS)
+
+/* Extract the size of the ioctl parameter argument and check its bounds.  */
+#   define CHECK_IOCTL(ARG, CMD) \
+  CHECK_N ((ARG), (((CMD) >> _IOC_SIZESHIFT) & ((1 << _IOC_SIZEBITS) - 1)))
+
+#  else
+#   define CHECK_IOCTL(ARG, CMD) __ptrvalue (ARG)
+#  endif
+
+# endif /* !__ASSEMBLER__ */
+
+#endif /* _bp_checks_h_ */