Viewing file:  memcpy-1.c (3.66 KB) -rw-r--r--
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/* This program 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 2 of the License, or
(at your option) any later version.
This program 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, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA. */
/* Verify memcpy operation. */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <libitm.h>
#define BEG_TRANSACTION \
_ITM_beginTransaction (pr_instrumentedCode | pr_hasNoAbort \
| pr_hasNoIrrevocable)
#define END_TRANSACTION \
_ITM_commitTransaction ()
#define MEMCPY _ITM_memcpyRtWt
static unsigned char *buf1, *buf2;
static size_t bufsize, page_size;
static int fail;
int getpagesize (void);
static void
do_test (size_t align1, size_t align2, size_t len)
{
size_t i, j;
unsigned char *s1, *s2;
unsigned char c1, c2;
if (align1 + len >= bufsize)
return;
if (align2 + len >= bufsize)
return;
c1 = random () >> 8;
c2 = random () >> 8;
memset (buf1, c1, bufsize);
memset (buf2, c2, bufsize);
s1 = buf1 + align1;
s2 = buf2 + align2;
for (i = 0, j = 1; i < len; i++, j += 23)
s1[i] = (j == c1 ? j + 1 : j);
BEG_TRANSACTION;
MEMCPY (s2, s1, len);
END_TRANSACTION;
if (memcmp (s1, s2, len) != 0)
{
printf ("Wrong result: dalign %zd salign %zd len %zd\n",
align2, align1, len);
fail = 1;
return;
}
for (i = (align2 > 64 ? align2 - 64 : 0); i < align2; ++i)
if (buf2[i] != c2)
{
printf ("Garbage before: ofs %zd\n", i);
fail = 1;
break;
}
for (i = align2 + len, j = i+64 < bufsize ? i+64 : bufsize; i < j; ++i)
if (buf2[i] != c2)
{
printf ("Garbage after: ofs %zd\n", i);
fail = 1;
break;
}
}
#ifndef MAP_ANONYMOUS
# ifdef MAP_ANON
# define MAP_ANONYMOUS MAP_ANON
# endif
#endif
int main()
{
size_t i, j;
page_size = getpagesize ();
bufsize = 2 * page_size;
buf1 = mmap (NULL, bufsize + 2*page_size, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (buf1 == MAP_FAILED)
return 1;
buf2 = mmap (NULL, bufsize + 2*page_size, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (buf2 == MAP_FAILED)
return 1;
if (mprotect (buf1, page_size, PROT_NONE))
return 1;
buf1 += page_size;
if (mprotect (buf1 + bufsize, page_size, PROT_NONE))
return 1;
if (mprotect (buf2, page_size, PROT_NONE))
return 1;
buf2 += page_size;
if (mprotect (buf2 + bufsize, page_size, PROT_NONE))
return 1;
for (i = 0; i < 18; ++i)
{
size_t len = 1 << i;
do_test (0, 0, len);
do_test (i, 0, len);
do_test (0, i, len);
do_test (i, i, len);
do_test (0, bufsize - len, len);
do_test (bufsize - len, 0, len);
do_test (i, bufsize - len, len);
do_test (bufsize - len, i, len);
}
for (i = 0; i < 32; ++i)
{
do_test (i, 0, i);
do_test (0, i, i);
do_test (i, i, i);
for (j = 0; j < 32; ++j)
{
do_test (i, bufsize - i - j, i);
do_test (bufsize - i - j, i, i);
}
}
for (i = 3; i < 32; ++i)
{
if ((i & (i - 1)) == 0)
continue;
do_test (0, 0, 16 * i);
do_test (i, 0, 16 * i);
do_test (0, i, 16 * i);
do_test (i, i, 16 * i);
}
return fail;
}
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