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[/] [openrisc/] [trunk/] [gnu-stable/] [newlib-1.18.0/] [newlib/] [libc/] [sys/] [linux/] [bp-checks.h] - Rev 207
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/* Bounded-pointer checking macros for C. Copyright (C) 2000 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Greg McGary <greg@mcgary.org> 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, 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 __BOUNDED_POINTERS__ # define BOUNDS_VIOLATED (__builtin_trap (), 0) /* 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)) # define _CHECK_N(ARG, N, COND) \ (((COND) \ && (__ptrvalue (ARG) < __ptrlow (ARG) \ || __ptrvalue (ARG) + (N) > __ptrhigh (ARG)) \ && BOUNDS_VIOLATED), \ __ptrvalue (ARG)) extern void *__unbounded __ubp_memchr (const void *__unbounded, int, unsigned); # define _CHECK_STRING(ARG, COND) \ (((COND) \ && (__ptrvalue (ARG) < __ptrlow (ARG) \ || !__ubp_memchr (__ptrvalue (ARG), '\0', \ (__ptrhigh (ARG) - __ptrvalue (ARG)))) \ && BOUNDS_VIOLATED), \ __ptrvalue (ARG)) /* Check bounds of a pointer seated to an array of N objects. */ # define CHECK_N(ARG, N) _CHECK_N ((ARG), (N), 1) /* Same as CHECK_N, but tolerate ARG == NULL. */ # define CHECK_N_NULL_OK(ARG, N) _CHECK_N ((ARG), (N), __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_1_NULL_OK(ARG) CHECK_N_NULL_OK ((ARG), 1) /* Check for NUL-terminator within string's bounds. */ # define CHECK_STRING(ARG) _CHECK_STRING ((ARG), 1) /* Same as CHECK_STRING, but tolerate ARG == NULL. */ # define CHECK_STRING_NULL_OK(ARG) _CHECK_STRING ((ARG), __ptrvalue (ARG)) /* Check bounds of signal syscall args with type sigset_t. */ # define CHECK_SIGSET(SET) CHECK_N ((SET), _NSIG / (8 * sizeof *(SET))) /* Same as CHECK_SIGSET, but tolerate SET == NULL. */ # define CHECK_SIGSET_NULL_OK(SET) CHECK_N_NULL_OK ((SET), _NSIG / (8 * sizeof *(SET))) # if defined (_IOC_SIZESHIFT) && defined (_IOC_SIZEBITS) /* Extract the size of the ioctl data and check its bounds. */ # define CHECK_IOCTL(ARG, CMD) \ CHECK_N ((const char *) (ARG), \ (((CMD) >> _IOC_SIZESHIFT) & ((1 << _IOC_SIZEBITS) - 1))) # else /* We don't know the size of the ioctl data, so the best we can do is check that the first byte is within bounds. */ # define CHECK_IOCTL(ARG, CMD) CHECK_1 ((const char *) ARG) # endif /* Check bounds of `struct flock *' for the locking fcntl commands. */ # define CHECK_FCNTL(ARG, CMD) \ (((CMD) == F_GETLK || (CMD) == F_SETLK || (CMD) == F_SETLKW) \ ? CHECK_1 ((struct flock *) ARG) : (unsigned long) (ARG)) /* Check bounds of an array of mincore residency-status flags that cover a region of NBYTES. Such a vector occupies one byte per page of memory. */ # define CHECK_N_PAGES(ARG, NBYTES) \ ({ int _page_size_ = sysconf (_SC_PAGE_SIZE); \ CHECK_N ((const char *) (ARG), \ ((NBYTES) + _page_size_ - 1) / _page_size_); }) /* Return a bounded pointer with value PTR that satisfies CHECK_N (PTR, N). */ # define BOUNDED_N(PTR, N) \ ({ __typeof (PTR) __bounded _p_; \ __ptrvalue _p_ = __ptrlow _p_ = __ptrvalue (PTR); \ __ptrhigh _p_ = __ptrvalue _p_ + (N); \ _p_; }) #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_1_NULL_OK(ARG) (ARG) # define CHECK_N(ARG, N) (ARG) # define CHECK_N_NULL_OK(ARG, N) (ARG) # define CHECK_STRING(ARG) (ARG) # define CHECK_SIGSET(SET) (SET) # define CHECK_SIGSET_NULL_OK(SET) (SET) # define CHECK_IOCTL(ARG, CMD) (ARG) # define CHECK_FCNTL(ARG, CMD) (ARG) # define CHECK_N_PAGES(ARG, NBYTES) (ARG) # define BOUNDED_N(PTR, N) (PTR) #endif /* !__BOUNDED_POINTERS__ */ #define BOUNDED_1(PTR) BOUNDED_N (PTR, 1) #endif /* _bp_checks_h_ */
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