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/* 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))
# define CHECK_SIGSET(SET) CHECK_N ((SET), _NSIG / (8 * sizeof *(SET)))
# define CHECK_SIGSETopt(SET) CHECK_Nopt ((SET), _NSIG / (8 * sizeof *(SET)))
# 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)
# define CHECK_SIGSET(SET) (SET)
# define CHECK_SIGSETopt(SET) (SET)
# 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_ */
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