LXR qemu/tests/tcg/aarch64/mte-4.c

   1/*
   2 * Memory tagging, re-reading tag checks.
   3 *
   4 * Copyright (c) 2021 Linaro Ltd
   5 * SPDX-License-Identifier: GPL-2.0-or-later
   6 */
   7
   8#include "mte.h"
   9
  10void __attribute__((noinline)) tagset(void *p, size_t size)
  11{
  12    size_t i;
  13    for (i = 0; i < size; i += 16) {
  14        asm("stg %0, [%0]" : : "r"(p + i));
  15    }
  16}
  17
  18void __attribute__((noinline)) tagcheck(void *p, size_t size)
  19{
  20    size_t i;
  21    void *c;
  22
  23    for (i = 0; i < size; i += 16) {
  24        asm("ldg %0, [%1]" : "=r"(c) : "r"(p + i), "0"(p));
  25        assert(c == p);
  26    }
  27}
  28
  29int main(int ac, char **av)
  30{
  31    size_t size = getpagesize() * 4;
  32    long excl = 1;
  33    int *p0, *p1;
  34
  35    enable_mte(PR_MTE_TCF_ASYNC);
  36    p0 = alloc_mte_mem(size);
  37
  38    /* Tag the pointer. */
  39    asm("irg %0,%1,%2" : "=r"(p1) : "r"(p0), "r"(excl));
  40
  41    tagset(p1, size);
  42    tagcheck(p1, size);
  43
  44    return 0;
  45}
  46