99 lines
3.4 KiB
C
99 lines
3.4 KiB
C
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/* Bounded-pointer checking macros for C.
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Copyright (C) 2000 Free Software Foundation, Inc.
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Contributed by Greg McGary <greg@mcgary.org>
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This file is part of the GNU C Library. Its master source is NOT part of
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the C library, however. The master source lives in the GNU MP Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#ifndef _bp_checks_h_
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# define _bp_checks_h_ 1
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# if !__ASSEMBLER__
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# if __BOUNDED_POINTERS__
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/* GKM FIXME: when gcc is ready, add real bounds checks */
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# define BOUNDS_VIOLATED (__builtin_trap (), 0)
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extern int __ubp_memchr (const char *__unbounded, int, unsigned);
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/* Verify that pointer's value >= low. Return pointer value. */
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# define CHECK_BOUNDS_LOW(ARG) \
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(((__ptrvalue (ARG) < __ptrlow (ARG)) && BOUNDS_VIOLATED), \
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__ptrvalue (ARG))
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/* Verify that pointer's value < high. Return pointer value. */
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# define CHECK_BOUNDS_HIGH(ARG) \
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(((__ptrvalue (ARG) > __ptrhigh (ARG)) && BOUNDS_VIOLATED), \
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__ptrvalue (ARG))
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/* Check bounds of a pointer seated to a single object. */
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# define CHECK_1(ARG) CHECK_N ((ARG), 1)
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/* Same as CHECK_1, but tolerate ARG == NULL. */
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# define CHECK_1opt(ARG) CHECK_Nopt ((ARG), 1)
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/* Check bounds of a pointer seated to an array of N objects. */
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# define CHECK_N(ARG, N) \
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(((__ptrvalue (ARG) < __ptrlow (ARG) \
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|| __ptrvalue (ARG) + (N) > __ptrhigh (ARG)) \
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&& BOUNDS_VIOLATED), __ptrvalue (ARG))
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/* Same as CHECK_N, but tolerate ARG == NULL. */
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# define CHECK_Nopt(ARG, N) \
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(((__ptrvalue (ARG) \
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&& (__ptrvalue (ARG) < __ptrlow (ARG) \
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|| __ptrvalue (ARG) + (N) > __ptrhigh (ARG))) \
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&& BOUNDS_VIOLATED), __ptrvalue (ARG))
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/* Check for NUL-terminator within string's bounds. */
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# define CHECK_STRING(ARG) \
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(((__ptrvalue (ARG) < __ptrlow (ARG) \
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|| !__ubp_memchr (__ptrvalue (ARG), '\0', \
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(__ptrhigh (ARG) - __ptrvalue (ARG)))) \
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&& BOUNDS_VIOLATED), \
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__ptrvalue (ARG))
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# else /* !__BOUNDED_POINTERS__ */
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/* Do nothing if not compiling with -fbounded-pointers. */
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# define BOUNDS_VIOLATED
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# define CHECK_BOUNDS_LOW(ARG) (ARG)
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# define CHECK_BOUNDS_HIGH(ARG) (ARG)
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# define CHECK_1(ARG) (ARG)
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# define CHECK_1opt(ARG) (ARG)
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# define CHECK_N(ARG, N) (ARG)
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# define CHECK_Nopt(ARG, N) (ARG)
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# define CHECK_STRING(ARG) (ARG)
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# endif /* !__BOUNDED_POINTERS__ */
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# if defined (_IOC_SIZESHIFT) && defined (_IOC_SIZEBITS)
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/* Extract the size of the ioctl parameter argument and check its bounds. */
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# define CHECK_IOCTL(ARG, CMD) \
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CHECK_N ((ARG), (((CMD) >> _IOC_SIZESHIFT) & ((1 << _IOC_SIZEBITS) - 1)))
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# else
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# define CHECK_IOCTL(ARG, CMD) __ptrvalue (ARG)
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# endif
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# endif /* !__ASSEMBLER__ */
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#endif /* _bp_checks_h_ */
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