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/* Common Linux target-dependent definitions for AArch64 MTE
Copyright (C) 2021-2024 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#ifndef ARCH_AARCH64_MTE_LINUX_H
#define ARCH_AARCH64_MTE_LINUX_H
#include "gdbsupport/common-defs.h"
/* Feature check for Memory Tagging Extension. */
#ifndef HWCAP2_MTE
#define HWCAP2_MTE (1 << 18)
#endif
/* The MTE regset consists of a single 64-bit register. */
#define AARCH64_LINUX_SIZEOF_MTE 8
/* We have one tag per 16 bytes of memory. */
#define AARCH64_MTE_GRANULE_SIZE 16
#define AARCH64_MTE_TAG_BIT_SIZE 4
#define AARCH64_MTE_LOGICAL_TAG_START_BIT 56
#define AARCH64_MTE_LOGICAL_MAX_VALUE 0xf
/* Memory tagging definitions. */
#ifndef SEGV_MTEAERR
# define SEGV_MTEAERR 8
# define SEGV_MTESERR 9
#endif
/* Memory tag types for AArch64. */
enum class aarch64_memtag_type
{
/* MTE logical tag contained in pointers. */
mte_logical = 0,
/* MTE allocation tag stored in memory tag granules. */
mte_allocation
};
/* Return the number of tag granules in the memory range
[ADDR, ADDR + LEN) given GRANULE_SIZE. */
extern size_t aarch64_mte_get_tag_granules (CORE_ADDR addr, size_t len,
size_t granule_size);
/* Return the 4-bit tag made from VALUE. */
extern CORE_ADDR aarch64_mte_make_ltag_bits (CORE_ADDR value);
/* Return the 4-bit tag that can be OR-ed to an address. */
extern CORE_ADDR aarch64_mte_make_ltag (CORE_ADDR value);
/* Helper to set the logical TAG for a 64-bit ADDRESS.
It is always possible to set the logical tag. */
extern CORE_ADDR aarch64_mte_set_ltag (CORE_ADDR address, CORE_ADDR tag);
/* Helper to get the logical tag from a 64-bit ADDRESS.
It is always possible to get the logical tag. */
extern CORE_ADDR aarch64_mte_get_ltag (CORE_ADDR address);
/* Given a TAGS vector containing 1 MTE tag per byte, pack the data as
2 tags per byte and resize the vector. */
extern void aarch64_mte_pack_tags (gdb::byte_vector &tags);
/* Given a TAGS vector containing 2 MTE tags per byte, unpack the data as
1 tag per byte and resize the vector. If SKIP_FIRST is TRUE, skip the
first unpacked element. Otherwise leave it in the unpacked vector. */
extern void aarch64_mte_unpack_tags (gdb::byte_vector &tags, bool skip_first);
#endif /* ARCH_AARCH64_MTE_LINUX_H */
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