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// cpu.cpp - written and placed in the public domain by Wei Dai
#include "pch.h"
#include "cpu.h"
#include "misc.h"
#include <algorithm>
#ifdef __GNUC__
#include <signal.h>
#include <setjmp.h>
#endif
NAMESPACE_BEGIN(CryptoPP)
#ifdef CRYPTOPP_X86_ASM_AVAILABLE
typedef void (*SigHandler)(int);
static jmp_buf s_jmpNoCPUID;
static void SigIllHandlerCPUID(int)
{
longjmp(s_jmpNoCPUID, 1);
}
bool CpuId(word32 input, word32 *output)
{
#ifdef _MSC_VER
__try
{
__asm
{
mov eax, input
cpuid
mov edi, output
mov [edi], eax
mov [edi+4], ebx
mov [edi+8], ecx
mov [edi+12], edx
}
}
__except (1)
{
return false;
}
return true;
#else
SigHandler oldHandler = signal(SIGILL, SigIllHandlerCPUID);
if (oldHandler == SIG_ERR)
return false;
bool result = true;
if (setjmp(s_jmpNoCPUID))
result = false;
else
{
__asm__
(
// save ebx in case -fPIC is being used
"push %%ebx; cpuid; mov %%ebx, %%edi; pop %%ebx"
: "=a" (output[0]), "=D" (output[1]), "=c" (output[2]), "=d" (output[3])
: "a" (input)
);
}
signal(SIGILL, oldHandler);
return result;
#endif
}
#ifndef _MSC_VER
static jmp_buf s_jmpNoSSE2;
static void SigIllHandlerSSE2(int)
{
longjmp(s_jmpNoSSE2, 1);
}
#endif
#elif _MSC_VER >= 1400 && CRYPTOPP_BOOL_X64
bool CpuId(word32 input, word32 *output)
{
__cpuid((int *)output, input);
return true;
}
inline bool TrySSE2()
{
return true;
}
#endif
#ifdef CRYPTOPP_CPUID_AVAILABLE
static bool TrySSE2()
{
#ifdef _MSC_VER
__try
{
#if CRYPTOPP_BOOL_SSE2_ASM_AVAILABLE
__asm por xmm0, xmm0 // executing SSE2 instruction
#elif CRYPTOPP_BOOL_SSE2_INTRINSICS_AVAILABLE
__mm128i x = _mm_setzero_si128();
return _mm_cvtsi128_si32(x) == 0;
#endif
}
__except (1)
{
return false;
}
return true;
#elif defined(__GNUC__)
SigHandler oldHandler = signal(SIGILL, SigIllHandlerSSE2);
if (oldHandler == SIG_ERR)
return false;
bool result = true;
if (setjmp(s_jmpNoSSE2))
result = false;
else
{
#if CRYPTOPP_BOOL_SSE2_ASM_AVAILABLE
__asm __volatile ("por %xmm0, %xmm0");
#elif CRYPTOPP_BOOL_SSE2_INTRINSICS_AVAILABLE
__mm128i x = _mm_setzero_si128();
result = _mm_cvtsi128_si32(x) == 0;
#endif
}
signal(SIGILL, oldHandler);
return result;
#else
return false;
#endif
}
bool g_x86DetectionDone = false;
bool g_hasSSE2 = false, g_hasSSSE3 = false, g_hasMMX = false, g_isP4 = false;
int g_cacheLineSize = CRYPTOPP_L1_CACHE_LINE_SIZE;
void DetectX86Features()
{
word32 cpuid[4], cpuid1[4];
if (!CpuId(0, cpuid))
return;
if (!CpuId(1, cpuid1))
return;
g_hasMMX = (cpuid1[3] & (1 << 23)) != 0;
if ((cpuid1[3] & (1 << 26)) != 0)
g_hasSSE2 = TrySSE2();
g_hasSSSE3 = g_hasSSE2 && (cpuid1[2] & (1<<9));
std::swap(cpuid[2], cpuid[3]);
if (memcmp(cpuid+1, "GenuineIntel", 12) == 0)
{
g_isP4 = ((cpuid1[0] >> 8) & 0xf) == 0xf;
g_cacheLineSize = 8 * GETBYTE(cpuid1[1], 1);
}
else if (memcmp(cpuid+1, "AuthenticAMD", 12) == 0)
{
CpuId(0x80000005, cpuid);
g_cacheLineSize = GETBYTE(cpuid[2], 0);
}
g_x86DetectionDone = true;
}
#endif
NAMESPACE_END
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