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
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
|
/* hwf-ppc.c - Detect hardware features - PPC part
* Copyright (C) 2013,2019 Jussi Kivilinna <jussi.kivilinna@iki.fi>
* Copyright (C) 2019 Shawn Landden <shawn@git.icu>
*
* This file is part of Libgcrypt.
*
* Libgcrypt is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* Libgcrypt 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <unistd.h>
#include <errno.h>
#if defined(HAVE_SYS_AUXV_H) && (defined(HAVE_GETAUXVAL) || \
defined(HAVE_ELF_AUX_INFO))
#include <sys/auxv.h>
#endif
#include "g10lib.h"
#include "hwf-common.h"
#if !defined (__powerpc__) && !defined (__powerpc64__)
# error Module build for wrong CPU.
#endif
#if defined(HAVE_SYS_AUXV_H) && defined(HAVE_ELF_AUX_INFO) && \
!defined(HAVE_GETAUXVAL) && defined(AT_HWCAP)
#define HAVE_GETAUXVAL
static unsigned long getauxval(unsigned long type)
{
unsigned long auxval = 0;
int err;
/* FreeBSD provides 'elf_aux_info' function that does the same as
* 'getauxval' on Linux. */
err = elf_aux_info (type, &auxval, sizeof(auxval));
if (err)
{
errno = err;
auxval = 0;
}
return auxval;
}
#endif
#undef HAS_SYS_AT_HWCAP
#if defined(__linux__) || \
(defined(HAVE_SYS_AUXV_H) && defined(HAVE_GETAUXVAL))
#define HAS_SYS_AT_HWCAP 1
struct feature_map_s
{
unsigned int hwcap_flag;
unsigned int hwcap2_flag;
unsigned int hwf_flag;
};
#if defined(__powerpc__) || defined(__powerpc64__)
/* Note: These macros have same values on Linux and FreeBSD. */
#ifndef AT_HWCAP
# define AT_HWCAP 16
#endif
#ifndef AT_HWCAP2
# define AT_HWCAP2 26
#endif
#ifndef PPC_FEATURE2_ARCH_2_07
# define PPC_FEATURE2_ARCH_2_07 0x80000000
#endif
#ifndef PPC_FEATURE2_VEC_CRYPTO
# define PPC_FEATURE2_VEC_CRYPTO 0x02000000
#endif
#ifndef PPC_FEATURE2_ARCH_3_00
# define PPC_FEATURE2_ARCH_3_00 0x00800000
#endif
#ifndef PPC_FEATURE2_ARCH_3_10
# define PPC_FEATURE2_ARCH_3_10 0x00040000
#endif
static const struct feature_map_s ppc_features[] =
{
{ 0, PPC_FEATURE2_ARCH_2_07, HWF_PPC_ARCH_2_07 },
#ifdef ENABLE_PPC_CRYPTO_SUPPORT
{ 0, PPC_FEATURE2_VEC_CRYPTO, HWF_PPC_VCRYPTO },
#endif
{ 0, PPC_FEATURE2_ARCH_3_00, HWF_PPC_ARCH_3_00 },
{ 0, PPC_FEATURE2_ARCH_3_10, HWF_PPC_ARCH_3_10 },
};
#endif
static int
get_hwcap(unsigned int *hwcap, unsigned int *hwcap2)
{
struct { unsigned long a_type; unsigned long a_val; } auxv;
FILE *f;
int err = -1;
static int hwcap_initialized = 0;
static unsigned int stored_hwcap = 0;
static unsigned int stored_hwcap2 = 0;
if (hwcap_initialized)
{
*hwcap = stored_hwcap;
*hwcap2 = stored_hwcap2;
return 0;
}
#if 0 // TODO: configure.ac detection for __builtin_cpu_supports
// TODO: move to 'detect_ppc_builtin_cpu_supports'
#if defined(__GLIBC__) && defined(__GNUC__) && __GNUC__ >= 6
/* __builtin_cpu_supports returns 0 if glibc support doesn't exist, so
* we can only trust positive results. */
#ifdef ENABLE_PPC_CRYPTO_SUPPORT
if (__builtin_cpu_supports("vcrypto")) /* TODO: Configure.ac */
{
stored_hwcap2 |= PPC_FEATURE2_VEC_CRYPTO;
hwcap_initialized = 1;
}
#endif
if (__builtin_cpu_supports("arch_3_00")) /* TODO: Configure.ac */
{
stored_hwcap2 |= PPC_FEATURE2_ARCH_3_00;
hwcap_initialized = 1;
}
#endif
#endif
#if defined(HAVE_SYS_AUXV_H) && defined(HAVE_GETAUXVAL)
errno = 0;
auxv.a_val = getauxval (AT_HWCAP);
if (errno == 0)
{
stored_hwcap |= auxv.a_val;
hwcap_initialized = 1;
}
if (AT_HWCAP2 >= 0)
{
errno = 0;
auxv.a_val = getauxval (AT_HWCAP2);
if (errno == 0)
{
stored_hwcap2 |= auxv.a_val;
hwcap_initialized = 1;
}
}
if (hwcap_initialized && (stored_hwcap || stored_hwcap2))
{
*hwcap = stored_hwcap;
*hwcap2 = stored_hwcap2;
return 0;
}
#endif
f = fopen("/proc/self/auxv", "r");
if (!f)
{
*hwcap = stored_hwcap;
*hwcap2 = stored_hwcap2;
return -1;
}
while (fread(&auxv, sizeof(auxv), 1, f) > 0)
{
if (auxv.a_type == AT_HWCAP)
{
stored_hwcap |= auxv.a_val;
hwcap_initialized = 1;
}
if (auxv.a_type == AT_HWCAP2)
{
stored_hwcap2 |= auxv.a_val;
hwcap_initialized = 1;
}
}
if (hwcap_initialized)
err = 0;
fclose(f);
*hwcap = stored_hwcap;
*hwcap2 = stored_hwcap2;
return err;
}
static unsigned int
detect_ppc_at_hwcap(void)
{
unsigned int hwcap;
unsigned int hwcap2;
unsigned int features = 0;
unsigned int i;
if (get_hwcap(&hwcap, &hwcap2) < 0)
return features;
for (i = 0; i < DIM(ppc_features); i++)
{
if (hwcap & ppc_features[i].hwcap_flag)
features |= ppc_features[i].hwf_flag;
if (hwcap2 & ppc_features[i].hwcap2_flag)
features |= ppc_features[i].hwf_flag;
}
return features;
}
#endif
unsigned int
_gcry_hwf_detect_ppc (void)
{
unsigned int ret = 0;
unsigned int broken_hwfs = 0;
#if defined (HAS_SYS_AT_HWCAP)
ret |= detect_ppc_at_hwcap ();
#endif
ret &= ~broken_hwfs;
return ret;
}
|
