LXR qemu/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
  11int 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