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
|
// crc_simd.cpp - written and placed in the public domain by
// Jeffrey Walton, Uri Blumenthal and Marcel Raad.
//
// This source file uses intrinsics to gain access to SSE4.2 and
// ARMv8a CRC-32 and CRC-32C instructions. A separate source file
// is needed because additional CXXFLAGS are required to enable
// the appropriate instructions sets in some build configurations.
#include "pch.h"
#include "config.h"
#include "misc.h"
#if (CRYPTOPP_SSE42_AVAILABLE)
# include <nmmintrin.h>
#endif
#if (CRYPTOPP_ARM_NEON_AVAILABLE)
# include <arm_neon.h>
#endif
#if (CRYPTOPP_ARM_ACLE_AVAILABLE)
# include <stdint.h>
# include <arm_acle.h>
#endif
#ifdef CRYPTOPP_GNU_STYLE_INLINE_ASSEMBLY
# include <signal.h>
# include <setjmp.h>
#endif
#ifndef EXCEPTION_EXECUTE_HANDLER
# define EXCEPTION_EXECUTE_HANDLER 1
#endif
// Squash MS LNK4221 and libtool warnings
extern const char CRC_SIMD_FNAME[] = __FILE__;
NAMESPACE_BEGIN(CryptoPP)
#ifdef CRYPTOPP_GNU_STYLE_INLINE_ASSEMBLY
extern "C" {
typedef void (*SigHandler)(int);
static jmp_buf s_jmpSIGILL;
static void SigIllHandler(int)
{
longjmp(s_jmpSIGILL, 1);
}
}
#endif // Not CRYPTOPP_MS_STYLE_INLINE_ASSEMBLY
#if (CRYPTOPP_BOOL_ARM32 || CRYPTOPP_BOOL_ARM64)
bool CPU_ProbeCRC32()
{
#if defined(CRYPTOPP_NO_CPU_FEATURE_PROBES)
return false;
#elif (CRYPTOPP_ARM_CRC32_AVAILABLE)
# if defined(CRYPTOPP_MS_STYLE_INLINE_ASSEMBLY)
volatile bool result = true;
__try
{
word32 w=0, x=1; word16 y=2; byte z=3;
w = __crc32w(w,x);
w = __crc32h(w,y);
w = __crc32b(w,z);
w = __crc32cw(w,x);
w = __crc32ch(w,y);
w = __crc32cb(w,z);
result = !!w;
}
__except (EXCEPTION_EXECUTE_HANDLER)
{
return false;
}
return result;
#else
// longjmp and clobber warnings. Volatile is required.
// http://github.com/weidai11/cryptopp/issues/24 and http://stackoverflow.com/q/7721854
volatile bool result = true;
volatile SigHandler oldHandler = signal(SIGILL, SigIllHandler);
if (oldHandler == SIG_ERR)
return false;
volatile sigset_t oldMask;
if (sigprocmask(0, NULLPTR, (sigset_t*)&oldMask))
return false;
if (setjmp(s_jmpSIGILL))
result = false;
else
{
word32 w=0, x=1; word16 y=2; byte z=3;
w = __crc32w(w,x);
w = __crc32h(w,y);
w = __crc32b(w,z);
w = __crc32cw(w,x);
w = __crc32ch(w,y);
w = __crc32cb(w,z);
// Hack... GCC optimizes away the code and returns true
result = !!w;
}
sigprocmask(SIG_SETMASK, (sigset_t*)&oldMask, NULLPTR);
signal(SIGILL, oldHandler);
return result;
# endif
#else
return false;
#endif // CRYPTOPP_ARM_CRC32_AVAILABLE
}
#endif // ARM32 or ARM64
#if (CRYPTOPP_ARM_CRC32_AVAILABLE)
void CRC32_Update_ARMV8(const byte *s, size_t n, word32& c)
{
for(; !IsAligned<word32>(s) && n > 0; s++, n--)
c = __crc32b(c, *s);
for(; n > 4; s+=4, n-=4)
c = __crc32w(c, *(const word32 *)(void*)s);
for(; n > 0; s++, n--)
c = __crc32b(c, *s);
}
void CRC32C_Update_ARMV8(const byte *s, size_t n, word32& c)
{
for(; !IsAligned<word32>(s) && n > 0; s++, n--)
c = __crc32cb(c, *s);
for(; n > 4; s+=4, n-=4)
c = __crc32cw(c, *(const word32 *)(void*)s);
for(; n > 0; s++, n--)
c = __crc32cb(c, *s);
}
#endif
#if (CRYPTOPP_SSE42_AVAILABLE)
void CRC32C_Update_SSE42(const byte *s, size_t n, word32& c)
{
for(; !IsAligned<word32>(s) && n > 0; s++, n--)
c = _mm_crc32_u8(c, *s);
for(; n > 4; s+=4, n-=4)
c = _mm_crc32_u32(c, *(const word32 *)(void*)s);
for(; n > 0; s++, n--)
c = _mm_crc32_u8(c, *s);
}
#endif
NAMESPACE_END
|
