mirror of
https://github.com/intel/isa-l.git
synced 2024-12-12 17:33:50 +01:00
d3cfb2fb77
The goal of this patch is to make isa-l testsuite pass on s390 with minimal changes to the library. The one and only reason isa-l does not work on s390 at the moment is that s390 is big-endian, and isa-l assumes little-endian at a lot of places. There are two flavors of this: loading/storing integers from/to memory, and overlapping structs. Loads/stores are already helpfully wrapped by unaligned.h header, so replace the functions there with endianness-aware variants. Solve struct member overlap by reversing their order on big-endian. Also, fix a couple of usages of uninitialized memory in the testsuite (found with MemorySanitizer). Fixes s390x part of #188. Change-Id: Iaf14a113bd266900192cc8b44212f8a47a8c7753 Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
70 lines
2.4 KiB
C
70 lines
2.4 KiB
C
/**********************************************************************
|
|
Copyright(c) 2011-2018 Intel Corporation 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.
|
|
* Neither the name of Intel Corporation nor the names of its
|
|
contributors may be used to endorse or promote products derived
|
|
from this software without specific prior written permission.
|
|
|
|
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 <stdint.h>
|
|
#include <stddef.h>
|
|
#include "unaligned.h"
|
|
|
|
int mem_zero_detect_base(void *buf, size_t n)
|
|
{
|
|
uint8_t *c = buf;
|
|
uintmax_t a = 0;
|
|
|
|
// Check buffer in native machine width comparisons
|
|
while (n >= sizeof(uintmax_t)) {
|
|
n -= sizeof(uintmax_t);
|
|
if (load_le_umax(c) != 0)
|
|
return -1;
|
|
c += sizeof(uintmax_t);
|
|
}
|
|
|
|
// Check remaining bytes
|
|
switch (n) {
|
|
case 7:
|
|
a |= *c++; // fall through to case 6,5,4
|
|
case 6:
|
|
a |= *c++; // fall through to case 5,4
|
|
case 5:
|
|
a |= *c++; // fall through to case 4
|
|
case 4:
|
|
a |= load_le_u32(c);
|
|
break;
|
|
case 3:
|
|
a |= *c++; // fall through to case 2
|
|
case 2:
|
|
a |= load_le_u16(c);
|
|
break;
|
|
case 1:
|
|
a |= *c;
|
|
break;
|
|
}
|
|
|
|
return (a == 0) ? 0 : -1;
|
|
}
|