libc/platform/bionic/mte_kernel.h

/*
 * Copyright (C) 2019 The Android Open Source Project
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#pragma once

// Defines constants used as part of the interface in an experimental MTE branch
// of the Linux kernel, which may be found at:
//
// https://github.com/pcc/linux/tree/android-experimental-mte
//
// This interface should not be considered to be stable.

#ifdef ANDROID_EXPERIMENTAL_MTE

#define HWCAP2_MTE (1 << 18)
#define PROT_MTE 0x20

#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_TCF_MASK (3UL << PR_MTE_TCF_SHIFT)
#define PR_MTE_TAG_SHIFT 3
#define PR_MTE_TAG_MASK (0xffffUL << PR_MTE_TAG_SHIFT)

#define SEGV_MTEAERR 8
#define SEGV_MTESERR 9

#define PTRACE_PEEKMTETAGS 33
#define PTRACE_POKEMTETAGS 34

#define NT_ARM_TAGGED_ADDR_CTRL 0x409

#endif