1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
|
/* Common Linux target-dependent functionality 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/>. */
#include "arch/aarch64-mte-linux.h"
/* See arch/aarch64-mte-linux.h */
void
aarch64_mte_pack_tags (gdb::byte_vector &tags)
{
/* Nothing to pack? */
if (tags.empty ())
return;
/* If the tags vector has an odd number of elements, add another
zeroed-out element to make it even. This facilitates packing. */
if ((tags.size () % 2) != 0)
tags.emplace_back (0);
for (int unpacked = 0, packed = 0; unpacked < tags.size ();
unpacked += 2, packed++)
tags[packed] = (tags[unpacked + 1] << 4) | tags[unpacked];
/* Now we have half the size. */
tags.resize (tags.size () / 2);
}
/* See arch/aarch64-mte-linux.h */
void
aarch64_mte_unpack_tags (gdb::byte_vector &tags, bool skip_first)
{
/* Nothing to unpack? */
if (tags.empty ())
return;
/* An unpacked MTE tags vector will have twice the number of elements
compared to an unpacked one. */
gdb::byte_vector unpacked_tags (tags.size () * 2);
int unpacked = 0, packed = 0;
if (skip_first)
{
/* We are not interested in the first unpacked element, just discard
it. */
unpacked_tags[unpacked] = (tags[packed] >> 4) & 0xf;
unpacked++;
packed++;
}
for (; packed < tags.size (); unpacked += 2, packed++)
{
unpacked_tags[unpacked] = tags[packed] & 0xf;
unpacked_tags[unpacked + 1] = (tags[packed] >> 4) & 0xf;
}
/* Update the original tags vector. */
tags = std::move (unpacked_tags);
}
/* See arch/aarch64-mte-linux.h */
size_t
aarch64_mte_get_tag_granules (CORE_ADDR addr, size_t len, size_t granule_size)
{
/* An empty range has 0 tag granules. */
if (len == 0)
return 0;
/* Start address */
CORE_ADDR s_addr = align_down (addr, granule_size);
/* End address */
CORE_ADDR e_addr = align_down (addr + len - 1, granule_size);
/* We always have at least 1 granule because len is non-zero at this
point. */
return 1 + (e_addr - s_addr) / granule_size;
}
/* See arch/aarch64-mte-linux.h */
CORE_ADDR
aarch64_mte_make_ltag_bits (CORE_ADDR value)
{
return value & AARCH64_MTE_LOGICAL_MAX_VALUE;
}
/* See arch/aarch64-mte-linux.h */
CORE_ADDR
aarch64_mte_make_ltag (CORE_ADDR value)
{
return (aarch64_mte_make_ltag_bits (value)
<< AARCH64_MTE_LOGICAL_TAG_START_BIT);
}
/* See arch/aarch64-mte-linux.h */
CORE_ADDR
aarch64_mte_set_ltag (CORE_ADDR address, CORE_ADDR tag)
{
/* Remove the existing tag. */
address &= ~aarch64_mte_make_ltag (AARCH64_MTE_LOGICAL_MAX_VALUE);
/* Return the new tagged address. */
return address | aarch64_mte_make_ltag (tag);
}
/* See arch/aarch64-mte-linux.h */
CORE_ADDR
aarch64_mte_get_ltag (CORE_ADDR address)
{
CORE_ADDR ltag_addr = address >> AARCH64_MTE_LOGICAL_TAG_START_BIT;
return aarch64_mte_make_ltag_bits (ltag_addr);
}
|
