Crypto++ 8.2
Free C&
ppc_power9.cpp
1// ppc_power9.cpp - written and placed in the public domain by
2// Jeffrey Walton, Uri Blumenthal and Marcel Raad.
3//
4// This source file uses intrinsics and built-ins to gain access to
5// Power9 instructions. A separate source file is needed because
6// additional CXXFLAGS are required to enable the appropriate
7// instructions sets in some build configurations.
8
9#include "pch.h"
10#include "config.h"
11
12#ifdef CRYPTOPP_GNU_STYLE_INLINE_ASSEMBLY
13# include <signal.h>
14# include <setjmp.h>
15#endif
16
17#if defined(_ARCH_PWR9)
18# include "ppc_simd.h"
19#endif
20
21// Squash MS LNK4221 and libtool warnings
22extern const char PPC_POWER9_FNAME[] = __FILE__;
23
24NAMESPACE_BEGIN(CryptoPP)
25
26// ************************* Feature Probes ************************* //
27
28#ifdef CRYPTOPP_GNU_STYLE_INLINE_ASSEMBLY
29extern "C" {
30 typedef void (*SigHandler)(int);
31
32 static jmp_buf s_jmpSIGILL;
33 static void SigIllHandler(int)
34 {
35 longjmp(s_jmpSIGILL, 1);
36 }
37}
38#endif // CRYPTOPP_MS_STYLE_INLINE_ASSEMBLY
39
40#if (CRYPTOPP_BOOL_PPC32 || CRYPTOPP_BOOL_PPC64)
41
42bool CPU_ProbePower9()
43{
44#if defined(CRYPTOPP_NO_CPU_FEATURE_PROBES)
45 return false;
46#elif defined(CRYPTOPP_POWER9_AVAILABLE)
47# if defined(CRYPTOPP_GNU_STYLE_INLINE_ASSEMBLY)
48 // longjmp and clobber warnings. Volatile is required.
49 // http://github.com/weidai11/cryptopp/issues/24 and http://stackoverflow.com/q/7721954
50 volatile int result = true;
51
52 volatile SigHandler oldHandler = signal(SIGILL, SigIllHandler);
53 if (oldHandler == SIG_ERR)
54 return false;
55
56 volatile sigset_t oldMask;
57 if (sigprocmask(0, NULLPTR, (sigset_t*)&oldMask))
58 return false;
59
60 if (setjmp(s_jmpSIGILL))
61 result = false;
62 else
63 {
64 // This is "darn r3, 0". It provides a conditioned 32-bit
65 // word. It is available on both 32-bit and 64-bit.
66#if CRYPTOPP_BIG_ENDIAN
67 __asm__ __volatile__ (".byte 0x7c, 0x60, 0x05, 0xe6 \n" : : : "r3");
68#else
69 __asm__ __volatile__ (".byte 0xe6, 0x05, 0x60, 0x7c \n" : : : "r3");
70#endif
71 result = true;
72 }
73
74 sigprocmask(SIG_SETMASK, (sigset_t*)&oldMask, NULLPTR);
75 signal(SIGILL, oldHandler);
76 return result;
77# endif
78#else
79 return false;
80#endif // _ARCH_PWR9
81}
82
83// The DARN probe is not guarded with a preprocessor macro at the moment. We
84// don't use CRYPTOPP_POWER9_AVAILABLE because old compilers, like GCC 4.8 on
85// CentOS 7, will report NO even though we can produce the random numbers.
86// Other Power9 implementations which use builtins will use the preprocessor
87// macro guard. This strategy also gets into a situation where Power9 is not
88// available but DARN is.
89bool CPU_ProbeDARN()
90{
91#if defined(CRYPTOPP_NO_CPU_FEATURE_PROBES)
92 return false;
93#else
94# if defined(CRYPTOPP_GNU_STYLE_INLINE_ASSEMBLY)
95 // longjmp and clobber warnings. Volatile is required.
96 // http://github.com/weidai11/cryptopp/issues/24 and http://stackoverflow.com/q/7721954
97 volatile int result = true;
98
99 volatile SigHandler oldHandler = signal(SIGILL, SigIllHandler);
100 if (oldHandler == SIG_ERR)
101 return false;
102
103 volatile sigset_t oldMask;
104 if (sigprocmask(0, NULLPTR, (sigset_t*)&oldMask))
105 return false;
106
107 if (setjmp(s_jmpSIGILL))
108 result = false;
109 else
110 {
111 // This is "darn r3, 0". It provides a conditioned 32-bit
112 // word. It is available on both 32-bit and 64-bit.
113#if CRYPTOPP_BIG_ENDIAN
114 __asm__ __volatile__ (".byte 0x7c, 0x60, 0x05, 0xe6 \n" : : : "r3");
115#else
116 __asm__ __volatile__ (".byte 0xe6, 0x05, 0x60, 0x7c \n" : : : "r3");
117#endif
118 result = true;
119 }
120
121 sigprocmask(SIG_SETMASK, (sigset_t*)&oldMask, NULLPTR);
122 signal(SIGILL, oldHandler);
123 return result;
124# endif
125#endif // DARN
126}
127
128#endif // PPC32 or PPC64
129
130NAMESPACE_END
Library configuration file.
Crypto++ library namespace.
Precompiled header file.
Support functions for PowerPC and vector operations.