38cf52b507
The O3 model supports unaligned accesses across page boundaries. This changeset provides a stress test for the feature. Other benchmarks exercise it, but their coverage is spotty. This test does nothing else except poke bytes which straddle page boundaries. Change-Id: Ic20c2862bcb7af7be091030c12916ba499db10c7 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/22303 Tested-by: kokoro <noreply+kokoro@google.com> Reviewed-by: Jason Lowe-Power <jason@lowepower.com> Maintainer: Jason Lowe-Power <jason@lowepower.com>
68 lines
2.5 KiB
C++
68 lines
2.5 KiB
C++
/*
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* Copyright (c) 2019 Advanced Micro Devices, Inc.
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* All rights reserved.
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*
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* For use for simulation and test purposes only
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*
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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 are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* Authors: Brandon Potter
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*/
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#include <sys/mman.h>
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#include <cstdint>
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#include <cstdio>
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#include <cstdlib>
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#include <ctime>
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int main(void)
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{
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uint64_t page_size = 0x1000;
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uint64_t num_pages = 0x10000;
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uint64_t length = page_size * num_pages;
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void *raw = mmap(NULL, length, PROT_WRITE, MAP_ANON|MAP_PRIVATE, -1, 0);
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uint8_t *mem = reinterpret_cast<uint8_t*>(raw);
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srand(0xABCD);
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uint64_t last_byte = page_size - 1;
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uint64_t page_boundaries = num_pages - 1;
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for (int i = 0; i < 2000; i++) {
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uint64_t random_boundary = rand() % page_boundaries;
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uint64_t boundary_offset = random_boundary * page_size;
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uint64_t boundary_last_byte = boundary_offset + last_byte;
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uint32_t *poke = reinterpret_cast<uint32_t*>(mem + boundary_last_byte);
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printf("%p\n", poke);
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uint32_t value = *poke;
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}
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return 0;
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}
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