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/* wipemem.h - wipememory macros
* Copyright (C) 2013 Jussi Kivilinna
* Copyright (C) 2014 g10 Code GmbH
*
* This file is part of NTBTLS
*
* NTBTLS is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* NTBTLS 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#ifndef NTBTLS_WIPEMEM_H
#define NTBTLS_WIPEMEM_H
/* To avoid that a compiler optimizes certain memset calls away, these
macros may be used instead. */
#ifdef HAVE_STDINT_H
# include <stdint.h>
/* Following architectures can handle unaligned accesses fast. */
# if defined(__i386__) || defined(__x86_64__) || \
defined(__powerpc__) || defined(__powerpc64__) || \
(defined(__arm__) && defined(__ARM_FEATURE_UNALIGNED)) || \
defined(__aarch64__)
# define _fast_wipememory2_unaligned_head(_ptr,_set,_len) /*do nothing*/
# else
#define FASTWIPE_T uint64_t
# define _fast_wipememory2_unaligned_head(_vptr,_vset,_vlen) do \
{ \
while((size_t)(_vptr)&(sizeof(FASTWIPE_T)-1) && _vlen) \
{ *_vptr=(_vset); _vptr++; _vlen--; } \
} while(0)
# endif
/* _fast_wipememory2 may leave tail bytes unhandled, in which case
tail bytes are handled by wipememory2. */
# define _fast_wipememory2(_vptr,_vset,_vlen) do \
{ \
uint64_t _vset_long = _vset; \
_fast_wipememory2_unaligned_head(_vptr,_vset,_vlen); \
if (_vlen < sizeof(uint64_t)) \
break; \
_vset_long *= UINT64_C(0x0101010101010101); \
do { \
volatile uint64_t *_vptr_long = (volatile void *)_vptr; \
*_vptr_long = _vset_long; \
_vlen -= sizeof(uint64_t); \
_vptr += sizeof(uint64_t); \
} while (_vlen >= sizeof(uint64_t)); \
} while (0)
# define wipememory2(_ptr,_set,_len) do \
{ \
volatile char *_vptr=(volatile char *)(_ptr); \
size_t _vlen=(_len); \
unsigned char _vset=(_set); \
_fast_wipememory2(_vptr,_vset,_vlen); \
while(_vlen) { *_vptr=(_vset); _vptr++; _vlen--; } \
} while (0)
#else /*!HAVE_STDINT_H*/
# define wipememory2(_ptr,_set,_len) do \
{ \
volatile char *_vptr=(volatile char *)(_ptr); \
size_t _vlen=(_len); \
while(_vlen) { *_vptr=(_set); _vptr++; _vlen--; } \
} while (0)
#endif /*!HAVE_STDINT_H*/
#define wipememory(_ptr,_len) wipememory2(_ptr,0,_len)
#endif /*NTBTLS_WIPEMEM_H*/

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