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/*
* Memory tagging, faulting unaligned access.
*
* Copyright (c) 2021 Linaro Ltd
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "mte.h"
void pass(int sig, siginfo_t *info, void *uc)
{
assert(info->si_code == SEGV_MTESERR);
exit(0);
}
int main(int ac, char **av)
{
struct sigaction sa;
void *p0, *p1, *p2;
long excl = 1;
enable_mte(PR_MTE_TCF_SYNC);
p0 = alloc_mte_mem(sizeof(*p0));
/* Create two differently tagged pointers. */
asm("irg %0,%1,%2" : "=r"(p1) : "r"(p0), "r"(excl));
asm("gmi %0,%1,%0" : "+r"(excl) : "r" (p1));
assert(excl != 1);
asm("irg %0,%1,%2" : "=r"(p2) : "r"(p0), "r"(excl));
assert(p1 != p2);
memset(&sa, 0, sizeof(sa));
sa.sa_sigaction = pass;
sa.sa_flags = SA_SIGINFO;
sigaction(SIGSEGV, &sa, NULL);
/* Store store two different tags in sequential granules. */
asm("stg %0, [%0]" : : "r"(p1));
asm("stg %0, [%0]" : : "r"(p2 + 16));
/* Perform an unaligned load crossing the granules. */
asm volatile("ldr %0, [%1]" : "=r"(p0) : "r"(p1 + 12));
abort();
}
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