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/* C-version of memmove for using when Intel MPX is enabled
in order to prosess with a buffer of pointers correctly.
Copyright (C) 2013 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
<http://www.gnu.org/licenses/>. */
#include <stddef.h>
void *
__memmove (void *dst, const void *src, size_t n)
{
if (n == 0) return dst;
__bnd_chk_ptr_lbounds(dst);
__bnd_chk_ptr_ubounds(dst+n-1);
#ifndef __CHKWR__
__bnd_chk_ptr_lbounds(src);
__bnd_chk_ptr_ubounds(src+n-1);
#endif
return chkp_memmove_nochk(dst, src, n);
}
void *
chkp_memmove_nochk (void *dst, const void *src, size_t n)
{
const char *s = src;
char *d = dst;
void *ret = dst;
size_t offset_src = ((size_t) s) & (sizeof(size_t) - 1);
size_t offset_dst = ((size_t) d) & (sizeof(size_t) - 1);
if (offset_src != offset_dst)
{
if (s < d)
{
/* backward copying */
d += n;
s += n;
while (n--)
*--d = *--s;
}
else
/* forward copying */
while (n--)
*d++ = *s++;
}
else
{
if (s < d)
{
offset_src = (offset_src + (size_t)src) & (sizeof(size_t) - 1);
/* backward copying */
d += n;
s += n;
while (n-- && offset_src--)
*--d = *--s;
n++;
if (!n) return ret;
void **d1 = (void **)d;
void **s1 = (void **)s;
while (n >= sizeof(void *))
{
n -= sizeof(void *);
*--d1 = *--s1;
}
s = (char *)s1;
d = (char *)d1;
while (n--)
*--d = *--s;
}
else
{
if (offset_src) offset_src = sizeof(size_t) - offset_src;
/* forward copying */
while (n-- && offset_src--)
*d++ = *s++;
n++;
if (!n) return ret;
void **d1 = (void **)d;
void **s1 = (void **)s;
while (n >= sizeof(void *))
{
n -= sizeof(void *);
*d1++ = *s1++;
}
s = (char *)s1;
d = (char *)d1;
while (n--)
*d++ = *s++;
}
}
return ret;
}
weak_alias (__memmove, __libc_memmove)
weak_alias (__memmove, __GI_memmove)
weak_alias (__memmove, memmove)
# if defined SHARED && !defined NOT_IN_libc
# include <shlib-compat.h>
# if SHLIB_COMPAT (libc, GLIBC_2_2_5, GLIBC_2_14)
compat_symbol (libc, memmove, memcpy, GLIBC_2_2_5);
# endif
# endif
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