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96 lines
2.7 KiB
96 lines
2.7 KiB
// ppc_simd.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 to gain access to AltiVec, |
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// Power8 and in-core crypto instructions. A separate source file |
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// is needed because additional CXXFLAGS are required to enable the |
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// appropriate instructions sets in some build configurations. |
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#include "pch.h" |
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#include "config.h" |
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#include "stdcpp.h" |
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#if defined(CRYPTOPP_ALTIVEC_AVAILABLE) |
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# include "ppc_simd.h" |
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#endif |
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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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#ifndef EXCEPTION_EXECUTE_HANDLER |
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# define EXCEPTION_EXECUTE_HANDLER 1 |
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#endif |
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// Squash MS LNK4221 and libtool warnings |
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extern const char PPC_SIMD_FNAME[] = __FILE__; |
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NAMESPACE_BEGIN(CryptoPP) |
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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 // Not CRYPTOPP_MS_STYLE_INLINE_ASSEMBLY |
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#if (CRYPTOPP_BOOL_PPC32 || CRYPTOPP_BOOL_PPC64) |
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bool CPU_ProbeAltivec() |
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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 (_ARCH_PWR3) && (CRYPTOPP_ALTIVEC_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/7721854 |
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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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CRYPTOPP_ALIGN_DATA(16) |
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const byte b1[16] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}; |
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CRYPTOPP_ALIGN_DATA(16) |
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const byte b2[16] = {1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1}; |
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CRYPTOPP_ALIGN_DATA(16) byte b3[16]; |
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// Specifically call the Altivec loads and stores |
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const uint8x16_p v1 = (uint8x16_p)vec_ld(0, (byte*)b1); |
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const uint8x16_p v2 = (uint8x16_p)vec_ld(0, (byte*)b2); |
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const uint8x16_p v3 = (uint8x16_p)VecXor(v1, v2); |
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vec_st(v3, 0, b3); |
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result = (0 == std::memcmp(b2, b3, 16)); |
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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 // CRYPTOPP_ALTIVEC_AVAILABLE |
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} |
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# endif // CRYPTOPP_BOOL_PPC32 || CRYPTOPP_BOOL_PPC64 |
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NAMESPACE_END
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