1 /* 2 * Memory tagging, unaligned access crossing pages. 3 * https://gitlab.com/qemu-project/qemu/-/issues/403 4 * 5 * Copyright (c) 2021 Linaro Ltd 6 * SPDX-License-Identifier: GPL-2.0-or-later 7 */ 8 9 #include "mte.h" 10 11 int main(int ac, char **av) 12 { 13 void *p; 14 15 enable_mte(PR_MTE_TCF_SYNC); 16 p = alloc_mte_mem(2 * 0x1000); 17 18 /* Tag the pointer. */ 19 p = (void *)((unsigned long)p | (1ul << 56)); 20 21 /* Store tag in sequential granules. */ 22 asm("stg %0, [%0]" : : "r"(p + 0x0ff0)); 23 asm("stg %0, [%0]" : : "r"(p + 0x1000)); 24 25 /* 26 * Perform an unaligned store with tag 1 crossing the pages. 27 * Failure dies with SIGSEGV. 28 */ 29 asm("str %0, [%0]" : : "r"(p + 0x0ffc)); 30 return 0; 31 } 32