46 lines
855 B
C
46 lines
855 B
C
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/*
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* Memory tagging, re-reading tag checks.
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*
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* Copyright (c) 2021 Linaro Ltd
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "mte.h"
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void __attribute__((noinline)) tagset(void *p, size_t size)
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{
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size_t i;
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for (i = 0; i < size; i += 16) {
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asm("stg %0, [%0]" : : "r"(p + i));
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}
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}
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void __attribute__((noinline)) tagcheck(void *p, size_t size)
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{
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size_t i;
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void *c;
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for (i = 0; i < size; i += 16) {
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asm("ldg %0, [%1]" : "=r"(c) : "r"(p + i), "0"(p));
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assert(c == p);
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}
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}
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int main(int ac, char **av)
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{
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size_t size = getpagesize() * 4;
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long excl = 1;
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int *p0, *p1;
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enable_mte(PR_MTE_TCF_ASYNC);
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p0 = alloc_mte_mem(size);
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/* Tag the pointer. */
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asm("irg %0,%1,%2" : "=r"(p1) : "r"(p0), "r"(excl));
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tagset(p1, size);
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tagcheck(p1, size);
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return 0;
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}
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