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
|
/* This testcase is part of GDB, the GNU debugger.
Copyright 2023-2024 Free Software Foundation, Inc.
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/>. */
/* AArch64 SVE feature check. This test serves as a way for the GDB testsuite
to verify that a target supports SVE at runtime, and also reports data
about the various supported SVE vector lengths. */
#include <stdio.h>
#include <sys/auxv.h>
#include <sys/prctl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#ifndef HWCAP_SVE
#define HWCAP_SVE (1 << 22)
#endif
#ifndef PR_SVE_SET_VL
#define PR_SVE_SET_VL 50
#define PR_SVE_GET_VL 51
#define PR_SVE_VL_LEN_MASK 0xffff
#endif
static int get_vl_size ()
{
int res = prctl (PR_SVE_GET_VL, 0, 0, 0, 0);
if (res < 0)
return -1;
return (res & PR_SVE_VL_LEN_MASK);
}
static int set_vl_size (int new_vl)
{
if (prctl (PR_SVE_SET_VL, new_vl, 0, 0, 0, 0) < 0)
return -1;
if (get_vl_size () != new_vl)
return -1;
return 0;
}
static void
dummy ()
{
}
#define VL_MIN 16
#define VL_MAX 256
#define VL_INCREMENT 16
int
main (int argc, char **argv)
{
/* Number of supported SVE vector lengths. */
size_t supported_vl_count = 0;
/* Vector containing the various supported SVE vector lengths. */
size_t supported_vl[16];
if (getauxval (AT_HWCAP) & HWCAP_SVE)
{
for (int vl = VL_MIN; vl <= VL_MAX; vl += VL_INCREMENT)
{
if (set_vl_size (vl) == 0)
{
supported_vl[supported_vl_count] = vl;
supported_vl_count++;
}
}
}
return 0; /* stop here */
}
|
