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aarch64-mte-linux.h
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1/* Common Linux target-dependent definitions for AArch64 MTE
2
3 Copyright (C) 2021-2023 Free Software Foundation, Inc.
4
5 This file is part of GDB.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
19
20#ifndef ARCH_AARCH64_MTE_LINUX_H
21#define ARCH_AARCH64_MTE_LINUX_H
22
23#include "gdbsupport/common-defs.h"
24
25/* Feature check for Memory Tagging Extension. */
26#ifndef HWCAP2_MTE
27#define HWCAP2_MTE (1 << 18)
28#endif
29
30/* The MTE regset consists of a single 64-bit register. */
31#define AARCH64_LINUX_SIZEOF_MTE 8
32
33/* We have one tag per 16 bytes of memory. */
34#define AARCH64_MTE_GRANULE_SIZE 16
35#define AARCH64_MTE_TAG_BIT_SIZE 4
36#define AARCH64_MTE_LOGICAL_TAG_START_BIT 56
37#define AARCH64_MTE_LOGICAL_MAX_VALUE 0xf
38
39/* Memory tagging definitions. */
40#ifndef SEGV_MTEAERR
41# define SEGV_MTEAERR 8
42# define SEGV_MTESERR 9
43#endif
44
45/* Memory tag types for AArch64. */
47{
48 /* MTE logical tag contained in pointers. */
49 mte_logical = 0,
50 /* MTE allocation tag stored in memory tag granules. */
52};
53
54/* Return the number of tag granules in the memory range
55 [ADDR, ADDR + LEN) given GRANULE_SIZE. */
56extern size_t aarch64_mte_get_tag_granules (CORE_ADDR addr, size_t len,
57 size_t granule_size);
58
59/* Return the 4-bit tag made from VALUE. */
60extern CORE_ADDR aarch64_mte_make_ltag_bits (CORE_ADDR value);
61
62/* Return the 4-bit tag that can be OR-ed to an address. */
63extern CORE_ADDR aarch64_mte_make_ltag (CORE_ADDR value);
64
65/* Helper to set the logical TAG for a 64-bit ADDRESS.
66
67 It is always possible to set the logical tag. */
68extern CORE_ADDR aarch64_mte_set_ltag (CORE_ADDR address, CORE_ADDR tag);
69
70/* Helper to get the logical tag from a 64-bit ADDRESS.
71
72 It is always possible to get the logical tag. */
73extern CORE_ADDR aarch64_mte_get_ltag (CORE_ADDR address);
74
75/* Given a TAGS vector containing 1 MTE tag per byte, pack the data as
76 2 tags per byte and resize the vector. */
77extern void aarch64_mte_pack_tags (gdb::byte_vector &tags);
78
79/* Given a TAGS vector containing 2 MTE tags per byte, unpack the data as
80 1 tag per byte and resize the vector. If SKIP_FIRST is TRUE, skip the
81 first unpacked element. Otherwise leave it in the unpacked vector. */
82extern void aarch64_mte_unpack_tags (gdb::byte_vector &tags, bool skip_first);
83
84#endif /* ARCH_AARCH64_MTE_LINUX_H */
CORE_ADDR aarch64_mte_get_ltag(CORE_ADDR address)
aarch64_memtag_type
size_t aarch64_mte_get_tag_granules(CORE_ADDR addr, size_t len, size_t granule_size)
void aarch64_mte_unpack_tags(gdb::byte_vector &tags, bool skip_first)
CORE_ADDR aarch64_mte_set_ltag(CORE_ADDR address, CORE_ADDR tag)
void aarch64_mte_pack_tags(gdb::byte_vector &tags)
CORE_ADDR aarch64_mte_make_ltag(CORE_ADDR value)
CORE_ADDR aarch64_mte_make_ltag_bits(CORE_ADDR value)
Definition value.h:130