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glibc/string/test-memmove.c

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/* Test and measure memmove functions.
Copyright (C) 1999-2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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, see
<https://www.gnu.org/licenses/>. */
#define TEST_MAIN
#ifdef TEST_BCOPY
# define TEST_NAME "bcopy"
#else
# define TEST_NAME "memmove"
#endif
#include "test-string.h"
#include <support/test-driver.h>
char *simple_memmove (char *, const char *, size_t);
#ifdef TEST_BCOPY
typedef void (*proto_t) (const char *, char *, size_t);
IMPL (bcopy, 1)
/* Naive implementation to verify results. */
void
simple_bcopy (const char *src, char *dst, size_t n)
{
simple_memmove (dst, src, n);
}
#else
typedef char *(*proto_t) (char *, const char *, size_t);
IMPL (memmove, 1)
#endif
/* Naive implementation to verify results. */
char *
inhibit_loop_to_libcall
simple_memmove (char *dst, const char *src, size_t n)
{
char *ret = dst;
if (src < dst)
{
dst += n;
src += n;
while (n--)
*--dst = *--src;
}
else
while (n--)
*dst++ = *src++;
return ret;
}
static void
do_one_test (impl_t *impl, char *dst, char *src, const char *orig_src,
size_t len)
{
/* This also clears the destination buffer set by the previous run. */
memcpy (src, orig_src, len);
#ifdef TEST_BCOPY
CALL (impl, src, dst, len);
#else
char *res;
res = CALL (impl, dst, src, len);
if (res != dst)
{
error (0, 0, "Wrong result in function %s %p %p", impl->name,
res, dst);
ret = 1;
return;
}
#endif
if (memcmp (dst, orig_src, len) != 0)
{
error (0, 0, "Wrong result in function %s dst \"%s\" src \"%s\"",
impl->name, dst, src);
ret = 1;
return;
}
}
static void
do_test (size_t align1, size_t align2, size_t len)
{
size_t i, j;
char *s1, *s2;
align1 &= (getpagesize() - 1);
if (align1 + len >= page_size)
return;
align2 &= (getpagesize() - 1);
if (align2 + len >= page_size)
return;
s1 = (char *) (buf1 + align1);
s2 = (char *) (buf2 + align2);
for (i = 0, j = 1; i < len; i++, j += 23)
s1[i] = j;
FOR_EACH_IMPL (impl, 0)
do_one_test (impl, s2, (char *) (buf2 + align1), s1, len);
}
static void
do_random_tests (void)
{
size_t i, n, align1, align2, len, size;
size_t srcstart, srcend, dststart, dstend;
int c;
unsigned char *p1, *p2;
#ifndef TEST_BCOPY
unsigned char *res;
#endif
for (n = 0; n < ITERATIONS; n++)
{
if ((random () & 255) == 0)
size = 65536;
else
size = 512;
if (size > page_size)
size = page_size;
if ((random () & 3) == 0)
{
len = random () & (size - 1);
align1 = size - len - (random () & 31);
align2 = size - len - (random () & 31);
if (align1 > size)
align1 = 0;
if (align2 > size)
align2 = 0;
}
else
{
align1 = random () & (size / 2 - 1);
align2 = random () & (size / 2 - 1);
len = random () & (size - 1);
if (align1 + len > size)
align1 = size - len;
if (align2 + len > size)
align2 = size - len;
}
p1 = buf1 + page_size - size;
p2 = buf2 + page_size - size;
c = random () & 255;
srcend = align1 + len + 256;
if (srcend > size)
srcend = size;
if (align1 > 256)
srcstart = align1 - 256;
else
srcstart = 0;
for (i = srcstart; i < srcend; ++i)
p1[i] = random () & 255;
dstend = align2 + len + 256;
if (dstend > size)
dstend = size;
if (align2 > 256)
dststart = align2 - 256;
else
dststart = 0;
FOR_EACH_IMPL (impl, 1)
{
memset (p2 + dststart, c, dstend - dststart);
memcpy (p2 + srcstart, p1 + srcstart, srcend - srcstart);
#ifdef TEST_BCOPY
CALL (impl, (char *) (p2 + align1), (char *) (p2 + align2), len);
#else
res = (unsigned char *) CALL (impl,
(char *) (p2 + align2),
(char *) (p2 + align1), len);
if (res != p2 + align2)
{
error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %zd, %zd) %p != %p",
n, impl->name, align1, align2, len, res, p2 + align2);
ret = 1;
}
#endif
if (memcmp (p1 + align1, p2 + align2, len))
{
error (0, 0, "Iteration %zd - different strings, %s (%zd, %zd, %zd)",
n, impl->name, align1, align2, len);
ret = 1;
}
for (i = dststart; i < dstend; ++i)
{
if (i >= align2 && i < align2 + len)
{
i = align2 + len - 1;
continue;
}
if (i >= srcstart && i < srcend)
{
i = srcend - 1;
continue;
}
if (p2[i] != c)
{
error (0, 0, "Iteration %zd - garbage in memset area, %s (%zd, %zd, %zd)",
n, impl->name, align1, align2, len);
ret = 1;
break;
}
}
if (srcstart < align2
&& memcmp (p2 + srcstart, p1 + srcstart,
(srcend > align2 ? align2 : srcend) - srcstart))
{
error (0, 0, "Iteration %zd - garbage before dst, %s (%zd, %zd, %zd)",
n, impl->name, align1, align2, len);
ret = 1;
break;
}
i = srcstart > align2 + len ? srcstart : align2 + len;
if (srcend > align2 + len
&& memcmp (p2 + i, p1 + i, srcend - i))
{
error (0, 0, "Iteration %zd - garbage after dst, %s (%zd, %zd, %zd)",
n, impl->name, align1, align2, len);
ret = 1;
break;
}
}
}
}
static void
do_test2 (size_t offset)
{
size_t size = 0x20000000;
uint32_t * large_buf;
large_buf = mmap ((void*) 0x70000000, size, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANON, -1, 0);
if (large_buf == MAP_FAILED)
error (EXIT_UNSUPPORTED, errno, "Large mmap failed");
if ((uintptr_t) large_buf > 0x80000000 - 128
|| 0x80000000 - (uintptr_t) large_buf > 0x20000000)
{
error (0, 0, "Large mmap allocated improperly");
ret = EXIT_UNSUPPORTED;
munmap ((void *) large_buf, size);
return;
}
size_t bytes_move = 0x80000000 - (uintptr_t) large_buf;
if (bytes_move + offset * sizeof (uint32_t) > size)
{
munmap ((void *) large_buf, size);
return;
}
size_t arr_size = bytes_move / sizeof (uint32_t);
size_t i;
size_t repeats;
uint32_t * src = large_buf;
uint32_t * dst = &large_buf[offset];
for (repeats = 0; repeats < 2; ++repeats)
{
FOR_EACH_IMPL (impl, 0)
{
for (i = 0; i < arr_size; i++)
src[i] = (uint32_t) i;
#ifdef TEST_BCOPY
CALL (impl, (char *) src, (char *) dst, bytes_move);
#else
CALL (impl, (char *) dst, (char *) src, bytes_move);
#endif
for (i = 0; i < arr_size; i++)
{
if (dst[i] != (uint32_t) i)
{
error (0, 0,
"Wrong result in function %s dst \"%p\" src \"%p\" offset \"%zd\"",
impl->name, dst, src, i);
ret = 1;
munmap ((void *) large_buf, size);
return;
}
}
}
src = dst;
dst = large_buf;
}
munmap ((void *) large_buf, size);
}
static void
do_test3 (size_t bytes_move, size_t offset)
{
size_t size = bytes_move * 3;
uint32_t *buf;
buf = mmap (NULL, size, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANON, -1, 0);
if (buf == MAP_FAILED)
error (EXIT_UNSUPPORTED, errno, "mmap failed");
size_t arr_size = bytes_move / sizeof (uint32_t);
size_t i;
FOR_EACH_IMPL (impl, 0)
{
for (i = 0; i < arr_size; i++)
buf[i] = (uint32_t) i;
uint32_t *dst = &buf[arr_size + offset];
#ifdef TEST_BCOPY
CALL (impl, (char *) buf, (char *) dst, bytes_move);
#else
CALL (impl, (char *) dst, (char *) buf, bytes_move);
#endif
for (i = 0; i < arr_size; i++)
{
if (dst[i] != (uint32_t) i)
{
error (0, 0,
"Wrong result in function %s dst \"%p\" src \"%p\" offset \"%zd\"",
impl->name, dst, buf, i);
ret = 1;
break;
}
}
}
munmap ((void *) buf, size);
}
static void
do_test4 (size_t bytes_move, size_t offset1, size_t offset2)
{
size_t size, repeats, i;
uint8_t *buf, *dst, *src;
size = bytes_move + MAX(offset1, offset2);
buf = mmap(NULL, size, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANON, -1, 0);
if (buf == MAP_FAILED)
error (EXIT_UNSUPPORTED, errno, "mmap failed");
dst = &buf[offset1];
src = &buf[offset2];
for (repeats = 0; repeats < 2; ++repeats)
{
FOR_EACH_IMPL (impl, 0)
{
for (i = 0; i < bytes_move; i++)
src[i] = (uint8_t) i;
#ifdef TEST_BCOPY
CALL (impl, (char *) src, (char *) dst, bytes_move);
#else
CALL (impl, (char *) dst, (char *) src, bytes_move);
#endif
for (i = 0; i < bytes_move; i++)
{
if (dst[i] != (uint8_t) i)
{
error (0, 0,
"Wrong result in function %s dst \"%p\" src \"%p\" offset \"%zd\"",
impl->name, dst, buf, i);
ret = 1;
break;
}
}
}
dst = &buf[offset2];
src = &buf[offset1];
}
munmap ((void *) buf, size);
}
int
test_main (void)
{
size_t i;
test_init ();
printf ("%23s", "");
FOR_EACH_IMPL (impl, 0)
printf ("\t%s", impl->name);
putchar ('\n');
for (i = 0; i < 14; ++i)
{
do_test (0, 32, 1 << i);
do_test (32, 0, 1 << i);
do_test (0, i, 1 << i);
do_test (i, 0, 1 << i);
}
for (i = 0; i < 32; ++i)
{
do_test (0, 32, i);
do_test (32, 0, i);
do_test (0, i, i);
do_test (i, 0, i);
}
for (i = 3; i < 32; ++i)
{
if ((i & (i - 1)) == 0)
continue;
do_test (0, 32, 16 * i);
do_test (32, 0, 16 * i);
do_test (0, i, 16 * i);
do_test (i, 0, 16 * i);
}
do_random_tests ();
do_test2 (0);
do_test2 (33);
do_test2 (0x200000 - 1);
do_test2 (0x200000);
do_test2 (0x200000 + 1);
do_test2 (0x1000000 - 1);
do_test2 (0x1000000);
do_test2 (0x1000000 + 1);
do_test2 (0x4000000 - 1);
do_test2 (0x4000000);
do_test2 (0x4000000 + 1);
/* Copy 16KB data. */
do_test3 (16384, 3);
for (i = 4096; i <= 16384; i <<= 1)
{
do_test4 (i, 0, i);
do_test4 (i, 0, i - 1);
do_test4 (i, 0, i + 1);
do_test4 (i, 63, i + 63);
do_test4 (i, 63, i + 64);
do_test4 (i, 63, i);
do_test4 (i, 0, 1);
do_test4 (i, 0, 15);
do_test4 (i, 0, 31);
do_test4 (i, 0, 63);
do_test4 (i, 0, 64);
do_test4 (i, 0, 65);
do_test4 (i, 0, 127);
do_test4 (i, 0, 129);
}
return ret;
}
#include <support/test-driver.c>
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