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/*
* Linux kernel fallback API definitions for MTE and test helpers.
*
* Copyright (c) 2021 Linaro Ltd
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include <assert.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <signal.h>
#include <sys/mman.h>
#include <sys/prctl.h>
#ifndef PR_SET_TAGGED_ADDR_CTRL
# define PR_SET_TAGGED_ADDR_CTRL 55
#endif
#ifndef PR_TAGGED_ADDR_ENABLE
# define PR_TAGGED_ADDR_ENABLE (1UL << 0)
#endif
#ifndef PR_MTE_TCF_SHIFT
# define PR_MTE_TCF_SHIFT 1
# define PR_MTE_TCF_NONE (0UL << PR_MTE_TCF_SHIFT)
# define PR_MTE_TCF_SYNC (1UL << PR_MTE_TCF_SHIFT)
# define PR_MTE_TCF_ASYNC (2UL << PR_MTE_TCF_SHIFT)
# define PR_MTE_TAG_SHIFT 3
#endif
#ifndef PROT_MTE
# define PROT_MTE 0x20
#endif
#ifndef SEGV_MTEAERR
# define SEGV_MTEAERR 8
# define SEGV_MTESERR 9
#endif
static void enable_mte(int tcf)
{
int r = prctl(PR_SET_TAGGED_ADDR_CTRL,
PR_TAGGED_ADDR_ENABLE | tcf | (0xfffe << PR_MTE_TAG_SHIFT),
0, 0, 0);
if (r < 0) {
perror("PR_SET_TAGGED_ADDR_CTRL");
exit(2);
}
}
static void *alloc_mte_mem(size_t size)
{
void *p = mmap(NULL, size, PROT_READ | PROT_WRITE | PROT_MTE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (p == MAP_FAILED) {
perror("mmap PROT_MTE");
exit(2);
}
return p;
}
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