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136 lines
3.9 KiB
136 lines
3.9 KiB
// ppc_power9.cpp - written and placed in the public domain by |
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// Jeffrey Walton, Uri Blumenthal and Marcel Raad. |
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// |
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// This source file uses intrinsics and built-ins to gain access to |
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// Power9 instructions. A separate source file is needed because |
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// additional CXXFLAGS are required to enable the appropriate |
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// instructions sets in some build configurations. |
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#include "pch.h" |
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#include "config.h" |
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#ifdef CRYPTOPP_GNU_STYLE_INLINE_ASSEMBLY |
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# include <signal.h> |
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# include <setjmp.h> |
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#endif |
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#if defined(_ARCH_PWR9) |
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# include "ppc_simd.h" |
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#endif |
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// Squash MS LNK4221 and libtool warnings |
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extern const char PPC_POWER9_FNAME[] = __FILE__; |
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NAMESPACE_BEGIN(CryptoPP) |
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// ************************* Feature Probes ************************* // |
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#ifdef CRYPTOPP_GNU_STYLE_INLINE_ASSEMBLY |
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extern "C" { |
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typedef void (*SigHandler)(int); |
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static jmp_buf s_jmpSIGILL; |
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static void SigIllHandler(int) |
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{ |
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longjmp(s_jmpSIGILL, 1); |
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} |
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} |
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#endif // CRYPTOPP_MS_STYLE_INLINE_ASSEMBLY |
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#if (CRYPTOPP_BOOL_PPC32 || CRYPTOPP_BOOL_PPC64) |
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bool CPU_ProbePower9() |
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{ |
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#if defined(CRYPTOPP_NO_CPU_FEATURE_PROBES) |
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return false; |
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#elif defined(CRYPTOPP_POWER9_AVAILABLE) |
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# if defined(CRYPTOPP_GNU_STYLE_INLINE_ASSEMBLY) |
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// longjmp and clobber warnings. Volatile is required. |
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// http://github.com/weidai11/cryptopp/issues/24 and http://stackoverflow.com/q/7721954 |
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volatile int result = true; |
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volatile SigHandler oldHandler = signal(SIGILL, SigIllHandler); |
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if (oldHandler == SIG_ERR) |
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return false; |
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volatile sigset_t oldMask; |
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if (sigprocmask(0, NULLPTR, (sigset_t*)&oldMask)) |
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{ |
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signal(SIGILL, oldHandler); |
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return false; |
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} |
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if (setjmp(s_jmpSIGILL)) |
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result = false; |
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else |
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{ |
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// This is "darn r3, 0". It provides a conditioned 32-bit |
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// word. It is available on both 32-bit and 64-bit. |
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#if CRYPTOPP_BIG_ENDIAN |
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__asm__ __volatile__ (".byte 0x7c, 0x60, 0x05, 0xe6 \n" : : : "r3"); |
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#else |
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__asm__ __volatile__ (".byte 0xe6, 0x05, 0x60, 0x7c \n" : : : "r3"); |
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#endif |
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result = true; |
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} |
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sigprocmask(SIG_SETMASK, (sigset_t*)&oldMask, NULLPTR); |
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signal(SIGILL, oldHandler); |
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return result; |
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# endif |
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#else |
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return false; |
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#endif // _ARCH_PWR9 |
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} |
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// The DARN probe is not guarded with a preprocessor macro at the moment. We |
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// don't use CRYPTOPP_POWER9_AVAILABLE because old compilers, like GCC 4.8 on |
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// CentOS 7, will report NO even though we can produce the random numbers. |
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// Other Power9 implementations which use builtins will use the preprocessor |
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// macro guard. This strategy also gets into a situation where Power9 is not |
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// available but DARN is. |
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bool CPU_ProbeDARN() |
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{ |
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#if defined(CRYPTOPP_NO_CPU_FEATURE_PROBES) |
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return false; |
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#else |
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# if defined(CRYPTOPP_GNU_STYLE_INLINE_ASSEMBLY) |
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// longjmp and clobber warnings. Volatile is required. |
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// http://github.com/weidai11/cryptopp/issues/24 and http://stackoverflow.com/q/7721954 |
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volatile int result = true; |
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volatile SigHandler oldHandler = signal(SIGILL, SigIllHandler); |
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if (oldHandler == SIG_ERR) |
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return false; |
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volatile sigset_t oldMask; |
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if (sigprocmask(0, NULLPTR, (sigset_t*)&oldMask)) |
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{ |
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signal(SIGILL, oldHandler); |
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return false; |
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} |
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if (setjmp(s_jmpSIGILL)) |
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result = false; |
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else |
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{ |
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// This is "darn r3, 0". It provides a conditioned 32-bit |
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// word. It is available on both 32-bit and 64-bit. |
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#if CRYPTOPP_BIG_ENDIAN |
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__asm__ __volatile__ (".byte 0x7c, 0x60, 0x05, 0xe6 \n" : : : "r3"); |
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#else |
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__asm__ __volatile__ (".byte 0xe6, 0x05, 0x60, 0x7c \n" : : : "r3"); |
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#endif |
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result = true; |
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} |
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sigprocmask(SIG_SETMASK, (sigset_t*)&oldMask, NULLPTR); |
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signal(SIGILL, oldHandler); |
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return result; |
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# endif |
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#endif // DARN |
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} |
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#endif // PPC32 or PPC64 |
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NAMESPACE_END
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