af00228b70
This reverts commit 80fba9a2fe,
which caused the system to not boot anymore, aborting with:
"java.lang.RuntimeException: Missing static main on com.android.server.SystemServer".
Change-Id: I745e0a23c728cccf5f95a3c7642d544478a4e57e
73 lines
2.7 KiB
C
73 lines
2.7 KiB
C
/*
|
|
* Copyright (C) 2008 The Android Open Source Project
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* * Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* * Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in
|
|
* the documentation and/or other materials provided with the
|
|
* distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
|
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
|
|
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
#include <string.h>
|
|
|
|
void *memmove(void *dst, const void *src, size_t n)
|
|
{
|
|
const char *p = src;
|
|
char *q = dst;
|
|
if (__builtin_expect(q < p, 1)) {
|
|
return memcpy(dst, src, n);
|
|
} else {
|
|
#define PRELOAD_DISTANCE 64
|
|
/* a semi-optimized memmove(). we're preloading the src and dst buffers
|
|
* as we go */
|
|
size_t c0, c1, i;
|
|
p += n;
|
|
q += n;
|
|
/* note: we preload the destination as well, because the 1-byte at a time
|
|
* copy below doesn't take advantage of the write-buffer, we need
|
|
* to use the cache instead as a poor man's write-combiner */
|
|
__builtin_prefetch(p-1);
|
|
__builtin_prefetch(q-1);
|
|
if (PRELOAD_DISTANCE > 32) {
|
|
__builtin_prefetch(p-(32+1));
|
|
__builtin_prefetch(q-(32+1));
|
|
}
|
|
/* do the prefetech as soon as possible, prevent the compiler to
|
|
* reorder the instructions above the prefetch */
|
|
asm volatile("":::"memory");
|
|
c0 = n & 0x1F; /* cache-line is 32 bytes */
|
|
c1 = n >> 5;
|
|
while ( c1-- ) {
|
|
/* ARMv6 can have up to 3 memory access outstanding */
|
|
__builtin_prefetch(p - (PRELOAD_DISTANCE+1));
|
|
__builtin_prefetch(q - (PRELOAD_DISTANCE+1));
|
|
asm volatile("":::"memory");
|
|
for (i=0 ; i<32 ; i++) {
|
|
*--q = *--p;
|
|
}
|
|
}
|
|
while ( c0-- ) {
|
|
*--q = *--p;
|
|
}
|
|
}
|
|
|
|
return dst;
|
|
}
|