tests/tcg/aarch64/mte-7.c

   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 }