61 lines
1.6 KiB
C
61 lines
1.6 KiB
C
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/*
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* Copyright(c) 2019-2021 Qualcomm Innovation Center, Inc. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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/*
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* Make sure that two stores in the same packet honor proper
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* semantics: slot 1 executes first, then slot 0.
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* This is important when the addresses overlap.
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*/
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static inline void dual_stores(int *p, char *q, int x, char y)
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{
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asm volatile("{\n\t"
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" memw(%0) = %2\n\t"
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" memb(%1) = %3\n\t"
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"}\n"
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:: "r"(p), "r"(q), "r"(x), "r"(y)
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: "memory");
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}
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typedef union {
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int word;
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char byte;
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} Dual;
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int err;
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static void check(Dual d, int expect)
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{
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if (d.word != expect) {
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printf("ERROR: 0x%08x != 0x%08x\n", d.word, expect);
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err++;
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}
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}
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int main()
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{
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Dual d;
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d.word = ~0;
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dual_stores(&d.word, &d.byte, 0x12345678, 0xff);
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check(d, 0x123456ff);
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puts(err ? "FAIL" : "PASS");
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return err;
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}
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