94 lines
2.7 KiB
C++
94 lines
2.7 KiB
C++
// ppc_power7.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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// Power7 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(__ALTIVEC__) || defined(_ARCH_PWR7)
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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_POWER7_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_ProbePower7()
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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_POWER7_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 = false;
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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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// POWER7 added unaligned loads and store operations
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byte b1[19] = {255, 255, 255, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1}, b2[17];
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// See comments in ppc_simd.h for some of these defines.
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#if defined(_AIX) && defined(_ARCH_PWR7) && ((__xlC__ & 0xff00) == 0x0c00)
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vec_xstw4(vec_xlw4(0, (unsigned int*)(b1+3)), 0, (unsigned int*)(b2+1));
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result = (0 == std::memcmp(b1+3, b2+1, 16));
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#elif defined(_ARCH_PWR7) && defined(__VSX__)
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vec_xst(vec_xl(0, (unsigned int*)(b1+3)), 0, (unsigned int*)(b2+1));
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result = (0 == std::memcmp(b1+3, b2+1, 16));
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#else
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result = false;
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#endif
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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_PWR7
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}
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#endif // PPC32 or PPC64
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NAMESPACE_END
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