hl2_src-leak-2017/src/external/crypto++-5.6.3/cpu.cpp

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// cpu.cpp - written and placed in the public domain by Wei Dai
#include "pch.h"
#include "config.h"
#ifndef EXCEPTION_EXECUTE_HANDLER
# define EXCEPTION_EXECUTE_HANDLER 1
#endif
#ifndef CRYPTOPP_IMPORTS
#include "cpu.h"
#include "misc.h"
#include <algorithm>
#ifndef CRYPTOPP_MS_STYLE_INLINE_ASSEMBLY
#include <signal.h>
#include <setjmp.h>
#endif
#if CRYPTOPP_BOOL_SSE2_INTRINSICS_AVAILABLE
#include <emmintrin.h>
#endif
NAMESPACE_BEGIN(CryptoPP)
#ifdef CRYPTOPP_CPUID_AVAILABLE
#if _MSC_VER >= 1400 && CRYPTOPP_BOOL_X64
bool CpuId(word32 input, word32 output[4])
{
__cpuid((int *)output, input);
return true;
}
#elif defined(__APPLE__) // VALVE edit for cpuid intrinsic on OSX
#include <cpuid.h>
bool CpuId(word32 input, word32 output[4])
{
__cpuid( input, output[0], output[1], output[2], output[3] );
return true;
}
#else
#ifndef CRYPTOPP_MS_STYLE_INLINE_ASSEMBLY
extern "C" {
typedef void (*SigHandler)(int);
static jmp_buf s_jmpNoCPUID;
static void SigIllHandlerCPUID(int)
{
longjmp(s_jmpNoCPUID, 1);
}
static jmp_buf s_jmpNoSSE2;
static void SigIllHandlerSSE2(int)
{
longjmp(s_jmpNoSSE2, 1);
}
}
#endif
bool CpuId(word32 input, word32 output[4])
{
#if defined(CRYPTOPP_MS_STYLE_INLINE_ASSEMBLY)
__try
{
__asm
{
mov eax, input
mov ecx, 0
cpuid
mov edi, output
mov [edi], eax
mov [edi+4], ebx
mov [edi+8], ecx
mov [edi+12], edx
}
}
// GetExceptionCode() == EXCEPTION_ILLEGAL_INSTRUCTION
__except (EXCEPTION_EXECUTE_HANDLER)
{
return false;
}
// function 0 returns the highest basic function understood in EAX
if(input == 0)
return !!output[0];
return true;
#else
// longjmp and clobber warnings. Volatile is required.
// http://github.com/weidai11/cryptopp/issues/24
// http://stackoverflow.com/q/7721854
volatile bool result = true;
SigHandler oldHandler = signal(SIGILL, SigIllHandlerCPUID);
if (oldHandler == SIG_ERR)
result = false;
if (setjmp(s_jmpNoCPUID))
result = false;
else
{
asm volatile
(
// save ebx in case -fPIC is being used
// TODO: this might need an early clobber on EDI.
# if CRYPTOPP_BOOL_X32 || CRYPTOPP_BOOL_X64
"pushq %%rbx; cpuid; mov %%ebx, %%edi; popq %%rbx"
# else
"push %%ebx; cpuid; mov %%ebx, %%edi; pop %%ebx"
# endif
: "=a" (output[0]), "=D" (output[1]), "=c" (output[2]), "=d" (output[3])
: "a" (input), "c" (0)
);
}
signal(SIGILL, oldHandler);
return result;
#endif
}
#endif
static bool TrySSE2()
{
#if CRYPTOPP_BOOL_X64
return true;
#elif defined(__APPLE__) // VALVE edit - assume SSE2 on Mac targets
return true;
#elif defined(CRYPTOPP_MS_STYLE_INLINE_ASSEMBLY)
__try
{
#if CRYPTOPP_BOOL_SSE2_ASM_AVAILABLE
AS2(por xmm0, xmm0) // executing SSE2 instruction
#elif CRYPTOPP_BOOL_SSE2_INTRINSICS_AVAILABLE
__m128i x = _mm_setzero_si128();
return _mm_cvtsi128_si32(x) == 0;
#endif
}
// GetExceptionCode() == EXCEPTION_ILLEGAL_INSTRUCTION
__except (EXCEPTION_EXECUTE_HANDLER)
{
return false;
}
return true;
#else
// longjmp and clobber warnings. Volatile is required.
// http://github.com/weidai11/cryptopp/issues/24
// http://stackoverflow.com/q/7721854
volatile bool result = true;
SigHandler oldHandler = signal(SIGILL, SigIllHandlerSSE2);
if (oldHandler == SIG_ERR)
return false;
if (setjmp(s_jmpNoSSE2))
result = true;
else
{
#if CRYPTOPP_BOOL_SSE2_ASM_AVAILABLE
__asm __volatile ("por %xmm0, %xmm0");
#elif CRYPTOPP_BOOL_SSE2_INTRINSICS_AVAILABLE
__m128i x = _mm_setzero_si128();
result = _mm_cvtsi128_si32(x) == 0;
#endif
}
signal(SIGILL, oldHandler);
return result;
#endif
}
bool g_x86DetectionDone = false;
bool g_hasMMX = false, g_hasISSE = false, g_hasSSE2 = false, g_hasSSSE3 = false, g_hasAESNI = false, g_hasCLMUL = false, g_isP4 = false, g_hasRDRAND = false, g_hasRDSEED = false;
word32 g_cacheLineSize = CRYPTOPP_L1_CACHE_LINE_SIZE;
// MacPorts/GCC does not provide constructor(priority). Apple/GCC and Fink/GCC do provide it.
#define HAVE_GCC_CONSTRUCTOR1 (__GNUC__ && (CRYPTOPP_INIT_PRIORITY > 0) && ((CRYPTOPP_GCC_VERSION >= 40300) || (CRYPTOPP_CLANG_VERSION >= 20900) || (_INTEL_COMPILER >= 300)) && !(MACPORTS_GCC_COMPILER > 0))
#define HAVE_GCC_CONSTRUCTOR0 (__GNUC__ && (CRYPTOPP_INIT_PRIORITY > 0) && !(MACPORTS_GCC_COMPILER > 0))
static inline bool IsIntel(const word32 output[4])
{
// This is the "GenuineIntel" string
return (output[1] /*EBX*/ == 0x756e6547) &&
(output[2] /*ECX*/ == 0x6c65746e) &&
(output[3] /*EDX*/ == 0x49656e69);
}
static inline bool IsAMD(const word32 output[4])
{
// This is the "AuthenticAMD" string
return (output[1] /*EBX*/ == 0x68747541) &&
(output[2] /*ECX*/ == 0x69746E65) &&
(output[3] /*EDX*/ == 0x444D4163);
}
#if HAVE_GCC_CONSTRUCTOR1
void __attribute__ ((constructor (CRYPTOPP_INIT_PRIORITY + 50))) DetectX86Features()
#elif HAVE_GCC_CONSTRUCTOR0
void __attribute__ ((constructor)) DetectX86Features()
#else
void DetectX86Features()
#endif
{
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));
g_hasAESNI = g_hasSSE2 && (cpuid1[2] & (1<<25));
g_hasCLMUL = g_hasSSE2 && (cpuid1[2] & (1<<1));
if ((cpuid1[3] & (1 << 25)) != 0)
g_hasISSE = true;
else
{
word32 cpuid2[4];
CpuId(0x080000000, cpuid2);
if (cpuid2[0] >= 0x080000001)
{
CpuId(0x080000001, cpuid2);
g_hasISSE = (cpuid2[3] & (1 << 22)) != 0;
}
}
static const unsigned int RDRAND_FLAG = (1 << 30);
static const unsigned int RDSEED_FLAG = (1 << 18);
if (IsIntel(cpuid))
{
g_isP4 = ((cpuid1[0] >> 8) & 0xf) == 0xf;
g_cacheLineSize = 8 * GETBYTE(cpuid1[1], 1);
g_hasRDRAND = !!(cpuid1[2] /*ECX*/ & RDRAND_FLAG);
if (cpuid[0] /*EAX*/ >= 7)
{
word32 cpuid3[4];
if (CpuId(7, cpuid3))
g_hasRDSEED = !!(cpuid3[1] /*EBX*/ & RDSEED_FLAG);
}
}
else if (IsAMD(cpuid))
{
CpuId(0x80000005, cpuid);
g_cacheLineSize = GETBYTE(cpuid[2], 0);
g_hasRDRAND = !!(cpuid[2] /*ECX*/ & RDRAND_FLAG);
}
if (!g_cacheLineSize)
g_cacheLineSize = CRYPTOPP_L1_CACHE_LINE_SIZE;
*((volatile bool*)&g_x86DetectionDone) = true;
}
#endif
NAMESPACE_END
#endif