mirror of
https://github.com/shadps4-emu/ext-cryptopp.git
synced 2024-11-23 09:59:42 +00:00
93 lines
2.6 KiB
C++
93 lines
2.6 KiB
C++
// 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 (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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return false;
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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)vec_xor(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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