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
  10 void __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
  18 void __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
  29 int 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 }