Crypto++ 8.6 Free C++ class library of cryptographic schemes

power9_ppc.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
22 extern const char PPC_POWER9_FNAME[] = __FILE__;
23
24 NAMESPACE_BEGIN(CryptoPP)
25
26 // ************************* Feature Probes ************************* //
27
28 #ifdef CRYPTOPP_GNU_STYLE_INLINE_ASSEMBLY
29 extern "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
42 bool 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 {
59 signal(SIGILL, oldHandler);
60 return false;
61 }
62
63 if (setjmp(s_jmpSIGILL))
64 result = false;
65 else
66 {
67 // This is "darn r3, 0" from POWER9. We cannot use __builtin_darn
68 // and friends because Clang and IBM XL C/C++ does not offer them.
69 #if CRYPTOPP_BIG_ENDIAN
70 __asm__ __volatile__ (".byte 0x7c, 0x60, 0x05, 0xe6 \n" : : : "r3");
71 #else
72 __asm__ __volatile__ (".byte 0xe6, 0x05, 0x60, 0x7c \n" : : : "r3");
73 #endif
74 result = true;
75 }
76
77 sigprocmask(SIG_SETMASK, (sigset_t*)&oldMask, NULLPTR);
78 signal(SIGILL, oldHandler);
79 return result;
80 # endif
81 #else
82 return false;
83 #endif // _ARCH_PWR9
84 }
85
86 // The DARN probe is not guarded with a preprocessor macro at the moment. We
87 // don't use CRYPTOPP_POWER9_AVAILABLE because old compilers, like GCC 4.8 on
88 // CentOS 7, will report NO even though we can produce the random numbers.
89 // Other Power9 implementations which use builtins will use the preprocessor
90 // macro guard. This strategy also gets into a situation where Power9 is not
91 // available but DARN is.
92 bool CPU_ProbeDARN()
93 {
94 #if defined(CRYPTOPP_NO_CPU_FEATURE_PROBES)
95 return false;
96 #else
97 # if defined(CRYPTOPP_GNU_STYLE_INLINE_ASSEMBLY)
98 // longjmp and clobber warnings. Volatile is required.
99 // http://github.com/weidai11/cryptopp/issues/24 and http://stackoverflow.com/q/7721954
100 volatile int result = true;
101
102 volatile SigHandler oldHandler = signal(SIGILL, SigIllHandler);
103 if (oldHandler == SIG_ERR)
104 return false;
105
106 volatile sigset_t oldMask;
107 if (sigprocmask(0, NULLPTR, (sigset_t*)&oldMask))
108 {
109 signal(SIGILL, oldHandler);
110 return false;
111 }
112
113 if (setjmp(s_jmpSIGILL))
114 result = false;
115 else
116 {
117 // This is "darn r3, 0" from POWER9. We cannot use __builtin_darn
118 // and friends because Clang and IBM XL C/C++ does not offer them.
119 #if CRYPTOPP_BIG_ENDIAN
120 __asm__ __volatile__ (".byte 0x7c, 0x60, 0x05, 0xe6 \n" : : : "r3");
121 #else
122 __asm__ __volatile__ (".byte 0xe6, 0x05, 0x60, 0x7c \n" : : : "r3");
123 #endif
124 result = true;
125 }
126
127 sigprocmask(SIG_SETMASK, (sigset_t*)&oldMask, NULLPTR);
128 signal(SIGILL, oldHandler);
129 return result;
130 # endif
131 #endif // DARN
132 }
133
134 #endif // PPC32 or PPC64
135
136 NAMESPACE_END
config.h
Library configuration file.
CryptoPP
Crypto++ library namespace.
pch.h
Precompiled header file.
ppc_simd.h
Support functions for PowerPC and vector operations.