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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
/**********************************************************************
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Copyright(c) 2011-2018 Intel Corporation All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the
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distribution.
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* Neither the name of Intel Corporation nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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**********************************************************************/
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#include <stdint.h>
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#include <stddef.h>
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#include "unaligned.h"
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int mem_zero_detect_base(void *buf, size_t n)
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{
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uint8_t *c = buf;
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uintmax_t a = 0;
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// Check buffer in native machine width comparisons
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while (n >= sizeof(uintmax_t)) {
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n -= sizeof(uintmax_t);
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if (load_le_umax(c) != 0)
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return -1;
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c += sizeof(uintmax_t);
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}
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// Check remaining bytes
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switch (n) {
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case 7:
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a |= *c++; // fall through to case 6,5,4
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case 6:
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a |= *c++; // fall through to case 5,4
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case 5:
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a |= *c++; // fall through to case 4
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case 4:
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a |= load_le_u32(c);
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break;
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case 3:
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a |= *c++; // fall through to case 2
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case 2:
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a |= load_le_u16(c);
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break;
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case 1:
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a |= *c;
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break;
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}
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return (a == 0) ? 0 : -1;
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}
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