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1/* Linux/ARM version of processor capability information handling macros.
2 Copyright (C) 2001-2022 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library. If not, see
17 <https://www.gnu.org/licenses/>. */
18
19#ifndef _DL_PROCINFO_H
20#define _DL_PROCINFO_H 1
21
22#include <ldsodefs.h>
23#include <sysdep.h>
24
25#define _DL_HWCAP_COUNT 27
26
27/* Low 22 bits are allocated in HWCAP. */
28#define _DL_HWCAP_LAST 21
29
30/* Low 5 bits are allocated in HWCAP2. */
31#define _DL_HWCAP2_LAST 4
32
33/* The kernel provides platform data but it is not interesting. */
34#define _DL_HWCAP_PLATFORM 0
35
36
37static inline const char *
38__attribute__ ((unused))
39_dl_hwcap_string (int idx)
40{
41 return GLRO(dl_arm_cap_flags)[idx];
42};
43
44static inline int
45__attribute__ ((unused))
46_dl_procinfo (unsigned int type, unsigned long int word)
47{
48 switch(type)
49 {
50 case AT_HWCAP:
51 _dl_printf ("AT_HWCAP: ");
52
53 for (int i = 0; i <= _DL_HWCAP_LAST; ++i)
54 if (word & (1 << i))
55 _dl_printf (" %s", _dl_hwcap_string (i));
56 break;
57 case AT_HWCAP2:
58 {
59 unsigned int offset = _DL_HWCAP_LAST + 1;
60
61 _dl_printf ("AT_HWCAP2: ");
62
63 for (int i = 0; i <= _DL_HWCAP2_LAST; ++i)
64 if (word & (1 << i))
65 _dl_printf (" %s", _dl_hwcap_string (offset + i));
66 break;
67 }
68 default:
69 /* Fallback to generic output mechanism. */
70 return -1;
71 }
72 _dl_printf ("\n");
73 return 0;
74}
75
76#define HWCAP_IMPORTANT (HWCAP_ARM_VFP | HWCAP_ARM_NEON)
77
78static inline int
79__attribute__ ((unused))
80_dl_string_hwcap (const char *str)
81{
82 for (int i = 0; i < _DL_HWCAP_COUNT; i++)
83 {
84 if (strcmp (str, _dl_hwcap_string (i)) == 0)
85 return i;
86 }
87 return -1;
88};
89
90#define _dl_string_platform(str) (-1)
91
92#endif /* dl-procinfo.h */
93

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source code of glibc/sysdeps/unix/sysv/linux/arm/dl-procinfo.h