| 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 | } |