1 /*
2 * Copyright(c) 2019-2021 Qualcomm Innovation Center, Inc. All Rights Reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, see <http://www.gnu.org/licenses/>.
16 */
17
18 #include <stdio.h>
19
20 /*
21 * Make sure that two stores in the same packet honor proper
22 * semantics: slot 1 executes first, then slot 0.
23 * This is important when the addresses overlap.
24 */
dual_stores(int * p,char * q,int x,char y)25 static inline void dual_stores(int *p, char *q, int x, char y)
26 {
27 asm volatile("{\n\t"
28 " memw(%0) = %2\n\t"
29 " memb(%1) = %3\n\t"
30 "}\n"
31 :: "r"(p), "r"(q), "r"(x), "r"(y)
32 : "memory");
33 }
34
35 typedef union {
36 int word;
37 char byte;
38 } Dual;
39
40 int err;
41
check(Dual d,int expect)42 static void check(Dual d, int expect)
43 {
44 if (d.word != expect) {
45 printf("ERROR: 0x%08x != 0x%08x\n", d.word, expect);
46 err++;
47 }
48 }
49
main()50 int main()
51 {
52 Dual d;
53
54 d.word = ~0;
55 dual_stores(&d.word, &d.byte, 0x12345678, 0xff);
56 check(d, 0x123456ff);
57
58 puts(err ? "FAIL" : "PASS");
59 return err;
60 }
61