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// ppc_simd.cpp - written and placed in the public domain by
// Jeffrey Walton, Uri Blumenthal and Marcel Raad.
//
// This source file uses intrinsics to gain access to AltiVec,
// Power8 and in-core crypto instructions. A separate source file
// is needed because additional CXXFLAGS are required to enable the
// appropriate instructions sets in some build configurations.
#include "pch.h"
#include "config.h"
#include "stdcpp.h"
#if defined(CRYPTOPP_ALTIVEC_AVAILABLE)
# include "ppc_simd.h"
#endif
#ifdef CRYPTOPP_GNU_STYLE_INLINE_ASSEMBLY
# include <signal.h>
# include <setjmp.h>
#endif
#ifndef EXCEPTION_EXECUTE_HANDLER
# define EXCEPTION_EXECUTE_HANDLER 1
#endif
// Squash MS LNK4221 and libtool warnings
extern const char PPC_SIMD_FNAME[] = __FILE__;
NAMESPACE_BEGIN(CryptoPP)
#ifdef CRYPTOPP_GNU_STYLE_INLINE_ASSEMBLY
extern "C" {
typedef void (*SigHandler)(int);
static jmp_buf s_jmpSIGILL;
static void SigIllHandler(int)
{
longjmp(s_jmpSIGILL, 1);
}
}
#endif // Not CRYPTOPP_MS_STYLE_INLINE_ASSEMBLY
#if (CRYPTOPP_BOOL_PPC32 || CRYPTOPP_BOOL_PPC64)
bool CPU_ProbeAltivec()
{
#if defined(CRYPTOPP_NO_CPU_FEATURE_PROBES)
return false;
#elif (_ARCH_PWR3) && (CRYPTOPP_ALTIVEC_AVAILABLE)
# if defined(CRYPTOPP_GNU_STYLE_INLINE_ASSEMBLY)
// longjmp and clobber warnings. Volatile is required.
// http://github.com/weidai11/cryptopp/issues/24 and http://stackoverflow.com/q/7721854
volatile int result = true;
volatile SigHandler oldHandler = signal(SIGILL, SigIllHandler);
if (oldHandler == SIG_ERR)
return false;
volatile sigset_t oldMask;
if (sigprocmask(0, NULLPTR, (sigset_t*)&oldMask))
{
signal(SIGILL, oldHandler);
return false;
}
if (setjmp(s_jmpSIGILL))
result = false;
else
{
CRYPTOPP_ALIGN_DATA(16)
const byte b1[16] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
CRYPTOPP_ALIGN_DATA(16)
const byte b2[16] = {1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1};
CRYPTOPP_ALIGN_DATA(16) byte b3[16];
// Specifically call the Altivec loads and stores
const uint8x16_p v1 = (uint8x16_p)vec_ld(0, (byte*)b1);
const uint8x16_p v2 = (uint8x16_p)vec_ld(0, (byte*)b2);
const uint8x16_p v3 = (uint8x16_p)VecXor(v1, v2);
vec_st(v3, 0, b3);
result = (0 == std::memcmp(b2, b3, 16));
}
sigprocmask(SIG_SETMASK, (sigset_t*)&oldMask, NULLPTR);
signal(SIGILL, oldHandler);
return result;
# endif
#else
return false;
#endif // CRYPTOPP_ALTIVEC_AVAILABLE
}
# endif // CRYPTOPP_BOOL_PPC32 || CRYPTOPP_BOOL_PPC64
NAMESPACE_END
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