1 /*
2 * Memory tagging, faulting unaligned access.
3 *
4 * Copyright (c) 2021 Linaro Ltd
5 * SPDX-License-Identifier: GPL-2.0-or-later
6 */
7
8 #include "mte.h"
9
pass(int sig,siginfo_t * info,void * uc)10 void pass(int sig, siginfo_t *info, void *uc)
11 {
12 assert(info->si_code == SEGV_MTESERR);
13 exit(0);
14 }
15
main(int ac,char ** av)16 int main(int ac, char **av)
17 {
18 struct sigaction sa;
19 void *p0, *p1, *p2;
20 long excl = 1;
21
22 enable_mte(PR_MTE_TCF_SYNC);
23 p0 = alloc_mte_mem(sizeof(*p0));
24
25 /* Create two differently tagged pointers. */
26 asm("irg %0,%1,%2" : "=r"(p1) : "r"(p0), "r"(excl));
27 asm("gmi %0,%1,%0" : "+r"(excl) : "r" (p1));
28 assert(excl != 1);
29 asm("irg %0,%1,%2" : "=r"(p2) : "r"(p0), "r"(excl));
30 assert(p1 != p2);
31
32 memset(&sa, 0, sizeof(sa));
33 sa.sa_sigaction = pass;
34 sa.sa_flags = SA_SIGINFO;
35 sigaction(SIGSEGV, &sa, NULL);
36
37 /* Store store two different tags in sequential granules. */
38 asm("stg %0, [%0]" : : "r"(p1));
39 asm("stg %0, [%0]" : : "r"(p2 + 16));
40
41 /* Perform an unaligned load crossing the granules. */
42 asm volatile("ldr %0, [%1]" : "=r"(p0) : "r"(p1 + 12));
43 abort();
44 }
45