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cpu.cpp
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cpu.cpp
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// cpu.cpp - originally written and placed in the public domain by Wei Dai
// modified by Jeffrey Walton and the community over the years.
#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 "stdcpp.h"
#ifdef _AIX
# include <sys/systemcfg.h>
#endif
#ifdef __linux__
# include <unistd.h>
#endif
// Capability queries, requires Glibc 2.16, http://lwn.net/Articles/519085/
// CRYPTOPP_GLIBC_VERSION not used because config.h is missing <feature.h>
#if (((__GLIBC__ * 100) + __GLIBC_MINOR__) >= 216)
# define CRYPTOPP_GETAUXV_AVAILABLE 1
#endif
#if CRYPTOPP_GETAUXV_AVAILABLE
# include <sys/auxv.h>
#else
#ifndef AT_HWCAP
# define AT_HWCAP 16
#endif
#ifndef AT_HWCAP2
# define AT_HWCAP2 26
#endif
unsigned long int getauxval(unsigned long int) { return 0; }
#endif
#if defined(__APPLE__)
# include <sys/utsname.h>
#endif
// The cpu-features header and source file are located in
// "$ANDROID_NDK_ROOT/sources/android/cpufeatures".
// setenv-android.sh will copy the header and source file
// into PWD and the makefile will build it in place.
#if defined(__ANDROID__)
# include "cpu-features.h"
#endif
#ifdef CRYPTOPP_GNU_STYLE_INLINE_ASSEMBLY
# include <signal.h>
# include <setjmp.h>
#endif
// Visual Studio 2008 and below are missing _xgetbv and _cpuidex.
// The 32-bit versions use inline ASM below. The 64-bit versions are in x64dll.asm.
#if defined(_MSC_VER) && defined(_M_X64)
extern "C" unsigned long long __fastcall XGETBV64(unsigned int);
extern "C" unsigned long long __fastcall CPUID64(unsigned int, unsigned int, unsigned int*);
#endif
#ifdef CRYPTOPP_GNU_STYLE_INLINE_ASSEMBLY
extern "C" {
typedef void (*SigHandler)(int);
}
extern "C"
{
static jmp_buf s_jmpNoCPUID;
static void SigIllHandler(int)
{
longjmp(s_jmpNoCPUID, 1);
}
}
#endif // CRYPTOPP_GNU_STYLE_INLINE_ASSEMBLY
ANONYMOUS_NAMESPACE_BEGIN
#if (CRYPTOPP_BOOL_X86 || CRYPTOPP_BOOL_X32 || CRYPTOPP_BOOL_X64)
using CryptoPP::word32;
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);
}
inline bool IsAMD(const word32 output[4])
{
// This is the "AuthenticAMD" string.
return ((output[1] /*EBX*/ == 0x68747541) &&
(output[2] /*ECX*/ == 0x444D4163) &&
(output[3] /*EDX*/ == 0x69746E65)) ||
// Early K5's can return "AMDisbetter!"
((output[1] /*EBX*/ == 0x69444d41) &&
(output[2] /*ECX*/ == 0x74656273) &&
(output[3] /*EDX*/ == 0x21726574));
}
inline bool IsHygon(const word32 output[4])
{
// This is the "HygonGenuine" string.
return (output[1] /*EBX*/ == 0x6f677948) &&
(output[2] /*ECX*/ == 0x656e6975) &&
(output[3] /*EDX*/ == 0x6e65476e);
}
inline bool IsVIA(const word32 output[4])
{
// This is the "CentaurHauls" string.
return ((output[1] /*EBX*/ == 0x746e6543) &&
(output[2] /*ECX*/ == 0x736c7561) &&
(output[3] /*EDX*/ == 0x48727561)) ||
// Some non-PadLock's return "VIA VIA VIA "
((output[1] /*EBX*/ == 0x32414956) &&
(output[2] /*ECX*/ == 0x32414956) &&
(output[3] /*EDX*/ == 0x32414956));
}
#endif // X86, X32 and X64
#if defined(__APPLE__)
// http://stackoverflow.com/questions/45637888/how-to-determine-armv8-features-at-runtime-on-ios
class AppleMachineInfo
{
public:
enum { PowerMac=1, Mac, iPhone, iPod, iPad, AppleTV, AppleWatch };
enum { PowerPC=1, I386, I686, X86_64, ARM32, ARMV8, ARMV84 };
AppleMachineInfo() : m_device(0), m_version(0), m_arch(0)
{
struct utsname systemInfo;
systemInfo.machine[0] = '\0';
uname(&systemInfo);
std::string machine(systemInfo.machine);
std::string::size_type pos = machine.find_first_of("0123456789");
if (pos != std::string::npos)
m_version = std::atoi(machine.substr(pos).c_str());
if (machine.find("iPhone") != std::string::npos)
{
m_device = iPhone;
if (m_version >= 6) { m_arch = ARMV8; }
else { m_arch = ARM32; }
}
else if (machine.find("iPod") != std::string::npos)
{
m_device = iPod;
if (m_version >= 6) { m_arch = ARMV8; }
else { m_arch = ARM32; }
}
else if (machine.find("iPad") != std::string::npos)
{
m_device = iPad;
if (m_version >= 5) { m_arch = ARMV8; }
else { m_arch = ARM32; }
}
else if (machine.find("PowerMac") != std::string::npos ||
machine.find("Power Macintosh") != std::string::npos)
{
m_device = PowerMac;
m_arch = PowerPC;
}
else if (machine.find("Mac") != std::string::npos ||
machine.find("Macintosh") != std::string::npos)
{
#if defined(__x86_64) || defined(__amd64)
m_device = Mac;
m_arch = X86_64;
#elif defined(__i386)
m_device = Mac;
m_arch = I386;
#elif defined(__i686)
m_device = Mac;
m_arch = I686;
#else
// Should never get here
m_device = Mac;
m_arch = 0;
#endif
}
else if (machine.find("AppleTV") != std::string::npos)
{
m_device = AppleTV;
if (m_version >= 4) { m_arch = ARMV8; }
else { m_arch = ARM32; }
}
else if (machine.find("AppleWatch") != std::string::npos)
{
m_device = AppleWatch;
if (m_version >= 4) { m_arch = ARMV8; }
else { m_arch = ARM32; }
}
}
unsigned int Device() const {
return m_device;
}
unsigned int Version() const {
return m_version;
}
unsigned int Arch() const {
return m_arch;
}
bool IsARM32() const {
return m_arch == ARM32;
}
bool IsARMv8() const {
return m_arch == ARMV8;
}
bool IsARMv84() const {
return m_arch == ARMV84;
}
private:
unsigned int m_device, m_version, m_arch;
};
void GetAppleMachineInfo(unsigned int& device, unsigned int& version, unsigned int& arch)
{
#if CRYPTOPP_CXX11_STATIC_INIT
static const AppleMachineInfo info;
#else
using CryptoPP::Singleton;
const AppleMachineInfo& info = Singleton<AppleMachineInfo>().Ref();
#endif
device = info.Device();
version = info.Version();
arch = info.Arch();
}
inline bool IsAppleMachineARM32()
{
static unsigned int arch;
if (arch == 0)
{
unsigned int unused;
GetAppleMachineInfo(unused, unused, arch);
}
return arch == AppleMachineInfo::ARM32;
}
inline bool IsAppleMachineARMv8()
{
static unsigned int arch;
if (arch == 0)
{
unsigned int unused;
GetAppleMachineInfo(unused, unused, arch);
}
return arch == AppleMachineInfo::ARMV8;
}
#endif // __APPLE__
ANONYMOUS_NAMESPACE_END
NAMESPACE_BEGIN(CryptoPP)
// *************************** IA-32 CPUs ***************************
#if (CRYPTOPP_BOOL_X86 || CRYPTOPP_BOOL_X32 || CRYPTOPP_BOOL_X64)
bool CRYPTOPP_SECTION_INIT g_x86DetectionDone = false;
bool CRYPTOPP_SECTION_INIT g_hasSSE2 = false;
bool CRYPTOPP_SECTION_INIT g_hasSSSE3 = false;
bool CRYPTOPP_SECTION_INIT g_hasSSE41 = false;
bool CRYPTOPP_SECTION_INIT g_hasSSE42 = false;
bool CRYPTOPP_SECTION_INIT g_hasAESNI = false;
bool CRYPTOPP_SECTION_INIT g_hasCLMUL = false;
bool CRYPTOPP_SECTION_INIT g_hasMOVBE = false;
bool CRYPTOPP_SECTION_INIT g_hasAVX = false;
bool CRYPTOPP_SECTION_INIT g_hasAVX2 = false;
bool CRYPTOPP_SECTION_INIT g_hasADX = false;
bool CRYPTOPP_SECTION_INIT g_hasSHA = false;
bool CRYPTOPP_SECTION_INIT g_hasRDRAND = false;
bool CRYPTOPP_SECTION_INIT g_hasRDSEED = false;
bool CRYPTOPP_SECTION_INIT g_isP4 = false;
bool CRYPTOPP_SECTION_INIT g_hasPadlockRNG = false;
bool CRYPTOPP_SECTION_INIT g_hasPadlockACE = false;
bool CRYPTOPP_SECTION_INIT g_hasPadlockACE2 = false;
bool CRYPTOPP_SECTION_INIT g_hasPadlockPHE = false;
bool CRYPTOPP_SECTION_INIT g_hasPadlockPMM = false;
word32 CRYPTOPP_SECTION_INIT g_cacheLineSize = CRYPTOPP_L1_CACHE_LINE_SIZE;
// For Solaris 11
extern bool CPU_ProbeSSE2();
// xcr0 is available when xgetbv is present.
// The intrinsic is broke on GCC 8.1 and earlier. Also see
// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85684.
word64 XGetBV(word32 num)
{
// Visual Studio 2010 and above, 32 and 64-bit
#if defined(_MSC_VER) && (_MSC_VER >= 1600)
return _xgetbv(num);
// Visual Studio 2008 and below, 64-bit
#elif defined(_MSC_VER) && defined(_M_X64)
return XGETBV64(num);
// Visual Studio 2008 and below, 32-bit
#elif defined(_MSC_VER) && defined(_M_IX86)
word32 a=0, d=0;
__asm {
push eax
push edx
push ecx
mov ecx, num
_emit 0x0f
_emit 0x01
_emit 0xd0
mov a, eax
mov d, edx
pop ecx
pop edx
pop eax
}
return (static_cast<word64>(d) << 32) | a;
// GCC 4.4 and above
#elif (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4))
word32 a=0, d=0;
__asm__
(
"xgetbv" : "=a"(a), "=d"(d) : "c"(num) : "cc"
);
return (static_cast<word64>(d) << 32) | a;
// Remainder of GCC and compatibles.
#else
// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71659 and
// http://www.agner.org/optimize/vectorclass/read.php?i=65
word32 a=0, d=0;
__asm__
(
".byte 0x0f, 0x01, 0xd0" "\n\t"
: "=a"(a), "=d"(d) : "c"(num) : "cc"
);
return (static_cast<word64>(d) << 32) | a;
#endif
}
// No inline due to Borland/Embarcadero and Issue 498
// cpu.cpp (131): E2211 Inline assembly not allowed in inline and template functions
bool CpuId(word32 func, word32 subfunc, word32 output[4])
{
// Visual Studio 2010 and above, 32 and 64-bit
#if defined(_MSC_VER) && (_MSC_VER >= 1600)
__cpuidex((int *)output, func, subfunc);
return true;
// Visual Studio 2008 and below, 64-bit
#elif defined(_MSC_VER) && defined(_M_X64)
CPUID64(func, subfunc, output);
return true;
// Visual Studio 2008 and below, 32-bit
#elif (defined(_MSC_VER) && defined(_M_IX86)) || defined(__BORLANDC__)
__try
{
// Borland/Embarcadero and Issue 500
// Local variables for cpuid output
word32 a, b, c, d;
__asm
{
push ebx
mov eax, func
mov ecx, subfunc
cpuid
mov [a], eax
mov [b], ebx
mov [c], ecx
mov [d], edx
pop ebx
}
output[0] = a;
output[1] = b;
output[2] = c;
output[3] = d;
}
__except (EXCEPTION_EXECUTE_HANDLER)
{
return false;
}
return true;
// Linux, Unix, OS X, Solaris, Cygwin, MinGW
#else
// longjmp and clobber warnings. Volatile is required.
// http://github.com/weidai11/cryptopp/issues/24 and http://stackoverflow.com/q/7721854
volatile bool result = true;
volatile SigHandler oldHandler = signal(SIGILL, SigIllHandler);
if (oldHandler == SIG_ERR)
return false;
# ifndef __MINGW32__
volatile sigset_t oldMask;
if (sigprocmask(0, NULLPTR, (sigset_t*)&oldMask) != 0)
{
signal(SIGILL, oldHandler);
return false;
}
# endif
if (setjmp(s_jmpNoCPUID))
result = false;
else
{
asm volatile
(
// save ebx in case -fPIC is being used
# 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" (func), "c" (subfunc)
: "cc"
);
}
# ifndef __MINGW32__
sigprocmask(SIG_SETMASK, (sigset_t*)&oldMask, NULLPTR);
# endif
signal(SIGILL, oldHandler);
return result;
#endif
}
void DetectX86Features()
{
// Coverity finding CID 171239. Initialize arrays.
// Indexes: EAX=0, EBX=1, ECX=2, EDX=3
word32 cpuid0[4]={0}, cpuid1[4]={0}, cpuid2[4]={0};
#if defined(CRYPTOPP_DISABLE_ASM)
// Not available
goto done;
#else
if (!CpuId(0, 0, cpuid0))
goto done;
if (!CpuId(1, 0, cpuid1))
goto done;
#endif
CRYPTOPP_CONSTANT(EAX_REG = 0);
CRYPTOPP_CONSTANT(EBX_REG = 1);
CRYPTOPP_CONSTANT(ECX_REG = 2);
CRYPTOPP_CONSTANT(EDX_REG = 3);
CRYPTOPP_CONSTANT(MMX_FLAG = (1 << 24)); // EDX
CRYPTOPP_CONSTANT(SSE_FLAG = (1 << 25)); // EDX
CRYPTOPP_CONSTANT(SSE2_FLAG = (1 << 26)); // EDX
CRYPTOPP_CONSTANT(SSE3_FLAG = (1 << 0)); // ECX
CRYPTOPP_CONSTANT(SSSE3_FLAG = (1 << 9)); // ECX
CRYPTOPP_CONSTANT(SSE41_FLAG = (1 << 19)); // ECX
CRYPTOPP_CONSTANT(SSE42_FLAG = (1 << 20)); // ECX
CRYPTOPP_CONSTANT(MOVBE_FLAG = (1 << 22)); // ECX
CRYPTOPP_CONSTANT(AESNI_FLAG = (1 << 25)); // ECX
CRYPTOPP_CONSTANT(CLMUL_FLAG = (1 << 1)); // ECX
CRYPTOPP_CONSTANT(XSAVE_FLAG = (1 << 26)); // ECX
CRYPTOPP_CONSTANT(OSXSAVE_FLAG = (1 << 27)); // ECX
CRYPTOPP_CONSTANT(AVX_FLAG = (3 << 27)); // ECX
CRYPTOPP_CONSTANT(YMM_FLAG = (3 << 1)); // CR0
// x86_64 machines don't check some flags because SSE2
// is part of the core instruction set architecture
CRYPTOPP_UNUSED(MMX_FLAG); CRYPTOPP_UNUSED(SSE_FLAG);
CRYPTOPP_UNUSED(SSE3_FLAG); CRYPTOPP_UNUSED(XSAVE_FLAG);
#if (CRYPTOPP_BOOL_X32 || CRYPTOPP_BOOL_X64)
// 64-bit core instruction set includes SSE2. Just check
// the OS enabled SSE2 support using OSXSAVE.
g_hasSSE2 = (cpuid1[ECX_REG] & OSXSAVE_FLAG) != 0;
#else
// Check the processor supports SSE2. Then use OSXSAVE to
// signal OS support for SSE2 to avoid probes.
// Also see http://stackoverflow.com/a/22521619/608639
// and http://github.com/weidai11/cryptopp/issues/511.
if ((cpuid1[EDX_REG] & SSE2_FLAG) == SSE2_FLAG)
g_hasSSE2 = (cpuid1[ECX_REG] & XSAVE_FLAG) != 0 &&
(cpuid1[ECX_REG] & OSXSAVE_FLAG) != 0;
#endif
// Solaris 11 i86pc does not signal SSE support using
// OSXSAVE. We need to probe for SSE support.
if (g_hasSSE2 == false)
g_hasSSE2 = CPU_ProbeSSE2();
if (g_hasSSE2 == false)
goto done;
g_hasSSSE3 = (cpuid1[ECX_REG] & SSSE3_FLAG) != 0;
g_hasSSE41 = (cpuid1[ECX_REG] & SSE41_FLAG) != 0;
g_hasSSE42 = (cpuid1[ECX_REG] & SSE42_FLAG) != 0;
g_hasMOVBE = (cpuid1[ECX_REG] & MOVBE_FLAG) != 0;
g_hasAESNI = (cpuid1[ECX_REG] & AESNI_FLAG) != 0;
g_hasCLMUL = (cpuid1[ECX_REG] & CLMUL_FLAG) != 0;
// AVX is similar to SSE. Check if AVX is available on the cpu, then
// check if the OS enabled XSAVE/XRESTORE for the extended registers.
// https://software.intel.com/en-us/blogs/2011/04/14/is-avx-enabled
if ((cpuid1[ECX_REG] & AVX_FLAG) == AVX_FLAG)
{
word64 xcr0 = XGetBV(0);
g_hasAVX = (xcr0 & YMM_FLAG) == YMM_FLAG;
}
if (IsIntel(cpuid0))
{
CRYPTOPP_CONSTANT(RDRAND_FLAG = (1 << 30));
CRYPTOPP_CONSTANT(RDSEED_FLAG = (1 << 18));
CRYPTOPP_CONSTANT( ADX_FLAG = (1 << 19));
CRYPTOPP_CONSTANT( SHA_FLAG = (1 << 29));
CRYPTOPP_CONSTANT( AVX2_FLAG = (1 << 5));
g_isP4 = ((cpuid1[0] >> 8) & 0xf) == 0xf;
g_cacheLineSize = 8 * GETBYTE(cpuid1[1], 1);
g_hasRDRAND = (cpuid1[ECX_REG] & RDRAND_FLAG) != 0;
if (cpuid0[EAX_REG] >= 7)
{
if (CpuId(7, 0, cpuid2))
{
g_hasRDSEED = (cpuid2[EBX_REG] & RDSEED_FLAG) != 0;
g_hasADX = (cpuid2[EBX_REG] & ADX_FLAG) != 0;
g_hasSHA = (cpuid2[EBX_REG] & SHA_FLAG) != 0;
g_hasAVX2 = (cpuid2[EBX_REG] & AVX2_FLAG) != 0;
}
}
}
else if (IsAMD(cpuid0) || IsHygon(cpuid0))
{
CRYPTOPP_CONSTANT(RDRAND_FLAG = (1 << 30));
CRYPTOPP_CONSTANT(RDSEED_FLAG = (1 << 18));
CRYPTOPP_CONSTANT( ADX_FLAG = (1 << 19));
CRYPTOPP_CONSTANT( SHA_FLAG = (1 << 29));
CRYPTOPP_CONSTANT( AVX2_FLAG = (1 << 5));
CpuId(0x80000005, 0, cpuid2);
g_cacheLineSize = GETBYTE(cpuid2[ECX_REG], 0);
g_hasRDRAND = (cpuid1[ECX_REG] & RDRAND_FLAG) != 0;
if (cpuid0[EAX_REG] >= 7)
{
if (CpuId(7, 0, cpuid2))
{
g_hasRDSEED = (cpuid2[EBX_REG] & RDSEED_FLAG) != 0;
g_hasADX = (cpuid2[EBX_REG] & ADX_FLAG) != 0;
g_hasSHA = (cpuid2[EBX_REG] & SHA_FLAG) != 0;
g_hasAVX2 = (cpuid2[EBX_REG] & AVX2_FLAG) != 0;
}
}
// Unconditionally disable RDRAND and RDSEED on AMD cpu's with family 15h or 16h.
// See Crypto++ Issue 924, https://github.com/weidai11/cryptopp/issues/924,
// Clear RDRAND CPUID bit on AMD family 15h/16h, https://lore.kernel.org/patchwork/patch/1115413/,
// and AMD CPUID Specification, https://www.amd.com/system/files/TechDocs/25481.pdf
{
CRYPTOPP_CONSTANT(FAMILY_BASE_FLAG = (0x0f << 8));
CRYPTOPP_CONSTANT(FAMILY_EXT_FLAG = (0xff << 20));
word32 family = (cpuid1[0] & FAMILY_BASE_FLAG) >> 8;
if (family == 0xf)
family += (cpuid1[0] & FAMILY_EXT_FLAG) >> 20;
if (family == 0x15 || family == 0x16)
{
g_hasRDRAND = false;
g_hasRDSEED = false;
}
}
}
else if (IsVIA(cpuid0))
{
// Two bits: available and enabled
CRYPTOPP_CONSTANT( RNG_FLAGS = (0x3 << 2));
CRYPTOPP_CONSTANT( ACE_FLAGS = (0x3 << 6));
CRYPTOPP_CONSTANT(ACE2_FLAGS = (0x3 << 8));
CRYPTOPP_CONSTANT( PHE_FLAGS = (0x3 << 10));
CRYPTOPP_CONSTANT( PMM_FLAGS = (0x3 << 12));
CpuId(0xC0000000, 0, cpuid2);
word32 extendedFeatures = cpuid2[0];
if (extendedFeatures >= 0xC0000001)
{
CpuId(0xC0000001, 0, cpuid2);
g_hasPadlockRNG = (cpuid2[EDX_REG] & RNG_FLAGS) != 0;
g_hasPadlockACE = (cpuid2[EDX_REG] & ACE_FLAGS) != 0;
g_hasPadlockACE2 = (cpuid2[EDX_REG] & ACE2_FLAGS) != 0;
g_hasPadlockPHE = (cpuid2[EDX_REG] & PHE_FLAGS) != 0;
g_hasPadlockPMM = (cpuid2[EDX_REG] & PMM_FLAGS) != 0;
}
if (extendedFeatures >= 0xC0000005)
{
CpuId(0xC0000005, 0, cpuid2);
g_cacheLineSize = GETBYTE(cpuid2[ECX_REG], 0);
}
}
// Keep AVX2 in sync with OS support for AVX. AVX tests both
// cpu support and OS support, while AVX2 only tests cpu support.
g_hasAVX2 &= g_hasAVX;
done:
#if defined(_SC_LEVEL1_DCACHE_LINESIZE)
// Glibc does not implement on some platforms. The runtime returns 0 instead of error.
// https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/posix/sysconf.c
int cacheLineSize = (int)sysconf(_SC_LEVEL1_DCACHE_LINESIZE);
if (g_cacheLineSize == 0 && cacheLineSize > 0)
g_cacheLineSize = cacheLineSize;
#endif
if (g_cacheLineSize == 0)
g_cacheLineSize = CRYPTOPP_L1_CACHE_LINE_SIZE;
*const_cast<volatile bool*>(&g_x86DetectionDone) = true;
}
// *************************** ARM-32, Aarch32 and Aarch64 ***************************
#elif (CRYPTOPP_BOOL_ARM32 || CRYPTOPP_BOOL_ARMV8)
bool CRYPTOPP_SECTION_INIT g_ArmDetectionDone = false;
bool CRYPTOPP_SECTION_INIT g_hasARMv7 = false;
bool CRYPTOPP_SECTION_INIT g_hasNEON = false;
bool CRYPTOPP_SECTION_INIT g_hasPMULL = false;
bool CRYPTOPP_SECTION_INIT g_hasCRC32 = false;
bool CRYPTOPP_SECTION_INIT g_hasAES = false;
bool CRYPTOPP_SECTION_INIT g_hasSHA1 = false;
bool CRYPTOPP_SECTION_INIT g_hasSHA2 = false;
bool CRYPTOPP_SECTION_INIT g_hasSHA512 = false;
bool CRYPTOPP_SECTION_INIT g_hasSHA3 = false;
bool CRYPTOPP_SECTION_INIT g_hasSM3 = false;
bool CRYPTOPP_SECTION_INIT g_hasSM4 = false;
word32 CRYPTOPP_SECTION_INIT g_cacheLineSize = CRYPTOPP_L1_CACHE_LINE_SIZE;
// ARM does not have an unprivliged equivalent to CPUID on IA-32. We have to
// jump through some hoops to detect features on a wide array of platforms.
// Our strategy is two part. First, attempt to *Query* the OS for a feature,
// like using getauxval on Linux. If that fails, then *Probe* the cpu
// executing an instruction and an observe a SIGILL if unsupported. The probes
// are in source files where compilation options like -march=armv8-a+crc make
// intrinsics available. They are expensive when compared to a standard OS
// feature query. Always perform the feature query first. For Linux see
// http://sourceware.org/ml/libc-help/2017-08/msg00012.html
// Avoid probes on Apple platforms because Apple's signal handling for SIGILLs
// appears broken. We are trying to figure out a way to feature test without
// probes. Also see http://stackoverflow.com/a/11197770/608639 and
// http://gist.github.com/erkanyildiz/390a480f27e86f8cd6ba.
extern bool CPU_ProbeARMv7();
extern bool CPU_ProbeNEON();
extern bool CPU_ProbeCRC32();
extern bool CPU_ProbeAES();
extern bool CPU_ProbeSHA1();
extern bool CPU_ProbeSHA256();
extern bool CPU_ProbeSHA512();
extern bool CPU_ProbeSHA3();
extern bool CPU_ProbeSM3();
extern bool CPU_ProbeSM4();
extern bool CPU_ProbePMULL();
// https://github.com/torvalds/linux/blob/master/arch/arm/include/uapi/asm/hwcap.h
// https://github.com/torvalds/linux/blob/master/arch/arm64/include/uapi/asm/hwcap.h
#ifndef HWCAP_ARMv7
# define HWCAP_ARMv7 (1 << 29)
#endif
#ifndef HWCAP_ASIMD
# define HWCAP_ASIMD (1 << 1)
#endif
#ifndef HWCAP_NEON
# define HWCAP_NEON (1 << 12)
#endif
#ifndef HWCAP_CRC32
# define HWCAP_CRC32 (1 << 7)
#endif
#ifndef HWCAP2_CRC32
# define HWCAP2_CRC32 (1 << 4)
#endif
#ifndef HWCAP_PMULL
# define HWCAP_PMULL (1 << 4)
#endif
#ifndef HWCAP2_PMULL
# define HWCAP2_PMULL (1 << 1)
#endif
#ifndef HWCAP_AES
# define HWCAP_AES (1 << 3)
#endif
#ifndef HWCAP2_AES
# define HWCAP2_AES (1 << 0)
#endif
#ifndef HWCAP_SHA1
# define HWCAP_SHA1 (1 << 5)
#endif
#ifndef HWCAP_SHA2
# define HWCAP_SHA2 (1 << 6)
#endif
#ifndef HWCAP2_SHA1
# define HWCAP2_SHA1 (1 << 2)
#endif
#ifndef HWCAP2_SHA2
# define HWCAP2_SHA2 (1 << 3)
#endif
#ifndef HWCAP_SHA3
# define HWCAP_SHA3 (1 << 17)
#endif
#ifndef HWCAP_SM3
# define HWCAP_SM3 (1 << 18)
#endif
#ifndef HWCAP_SM4
# define HWCAP_SM4 (1 << 19)
#endif
#ifndef HWCAP_SHA512
# define HWCAP_SHA512 (1 << 21)
#endif
inline bool CPU_QueryARMv7()
{
#if defined(__ANDROID__) && defined(__arm__)
if (((android_getCpuFamily() & ANDROID_CPU_FAMILY_ARM) != 0) &&
((android_getCpuFeatures() & ANDROID_CPU_ARM_FEATURE_ARMv7) != 0))
return true;
#elif defined(__linux__) && defined(__arm__)
if ((getauxval(AT_HWCAP) & HWCAP_ARMv7) != 0 ||
(getauxval(AT_HWCAP) & HWCAP_NEON) != 0)
return true;
#elif defined(__APPLE__) && defined(__arm__)
// Apple hardware is ARMv7 or above.
return true;
#endif
return false;
}
inline bool CPU_QueryNEON()
{
#if defined(__ANDROID__) && defined(__aarch64__)
if (((android_getCpuFamily() & ANDROID_CPU_FAMILY_ARM64) != 0) &&
((android_getCpuFeatures() & ANDROID_CPU_ARM64_FEATURE_ASIMD) != 0))
return true;
#elif defined(__ANDROID__) && defined(__arm__)
if (((android_getCpuFamily() & ANDROID_CPU_FAMILY_ARM) != 0) &&
((android_getCpuFeatures() & ANDROID_CPU_ARM_FEATURE_NEON) != 0))
return true;
#elif defined(__linux__) && defined(__aarch64__)
if ((getauxval(AT_HWCAP) & HWCAP_ASIMD) != 0)
return true;
#elif defined(__linux__) && defined(__aarch32__)
if ((getauxval(AT_HWCAP2) & HWCAP2_ASIMD) != 0)
return true;
#elif defined(__linux__) && defined(__arm__)
if ((getauxval(AT_HWCAP) & HWCAP_NEON) != 0)
return true;
#elif defined(__APPLE__) && defined(__aarch64__)
// Core feature set for Aarch32 and Aarch64.
return true;
#endif
return false;
}
inline bool CPU_QueryCRC32()
{
#if defined(__ANDROID__) && defined(__aarch64__)
if (((android_getCpuFamily() & ANDROID_CPU_FAMILY_ARM64) != 0) &&
((android_getCpuFeatures() & ANDROID_CPU_ARM64_FEATURE_CRC32) != 0))
return true;
#elif defined(__ANDROID__) && defined(__aarch32__)
if (((android_getCpuFamily() & ANDROID_CPU_FAMILY_ARM) != 0) &&
((android_getCpuFeatures() & ANDROID_CPU_ARM_FEATURE_CRC32) != 0))
return true;
#elif defined(__linux__) && defined(__aarch64__)
if ((getauxval(AT_HWCAP) & HWCAP_CRC32) != 0)
return true;
#elif defined(__linux__) && defined(__aarch32__)
if ((getauxval(AT_HWCAP2) & HWCAP2_CRC32) != 0)
return true;
#elif defined(__APPLE__) && defined(__aarch64__)
// No compiler support. CRC intrinsics result in a failed compiled.
return false;
#endif
return false;
}
inline bool CPU_QueryPMULL()
{
#if defined(__ANDROID__) && defined(__aarch64__)
if (((android_getCpuFamily() & ANDROID_CPU_FAMILY_ARM64) != 0) &&
((android_getCpuFeatures() & ANDROID_CPU_ARM64_FEATURE_PMULL) != 0))
return true;
#elif defined(__ANDROID__) && defined(__aarch32__)
if (((android_getCpuFamily() & ANDROID_CPU_FAMILY_ARM) != 0) &&
((android_getCpuFeatures() & ANDROID_CPU_ARM_FEATURE_PMULL) != 0))
return true;
#elif defined(__linux__) && defined(__aarch64__)
if ((getauxval(AT_HWCAP) & HWCAP_PMULL) != 0)
return true;
#elif defined(__linux__) && defined(__aarch32__)
if ((getauxval(AT_HWCAP2) & HWCAP2_PMULL) != 0)
return true;
#elif defined(__APPLE__) && defined(__aarch64__)
// No compiler support. PMULL intrinsics result in a failed compiled.
return false;
#endif
return false;
}
inline bool CPU_QueryAES()
{
#if defined(__ANDROID__) && defined(__aarch64__)
if (((android_getCpuFamily() & ANDROID_CPU_FAMILY_ARM64) != 0) &&
((android_getCpuFeatures() & ANDROID_CPU_ARM64_FEATURE_AES) != 0))
return true;
#elif defined(__ANDROID__) && defined(__aarch32__)
if (((android_getCpuFamily() & ANDROID_CPU_FAMILY_ARM) != 0) &&
((android_getCpuFeatures() & ANDROID_CPU_ARM_FEATURE_AES) != 0))
return true;
#elif defined(__linux__) && defined(__aarch64__)
if ((getauxval(AT_HWCAP) & HWCAP_AES) != 0)
return true;
#elif defined(__linux__) && defined(__aarch32__)
if ((getauxval(AT_HWCAP2) & HWCAP2_AES) != 0)
return true;
#elif defined(__APPLE__) && defined(__aarch64__)
return IsAppleMachineARMv8();
#endif
return false;
}
inline bool CPU_QuerySHA1()
{
#if defined(__ANDROID__) && defined(__aarch64__)
if (((android_getCpuFamily() & ANDROID_CPU_FAMILY_ARM64) != 0) &&
((android_getCpuFeatures() & ANDROID_CPU_ARM64_FEATURE_SHA1) != 0))
return true;
#elif defined(__ANDROID__) && defined(__aarch32__)
if (((android_getCpuFamily() & ANDROID_CPU_FAMILY_ARM) != 0) &&
((android_getCpuFeatures() & ANDROID_CPU_ARM_FEATURE_SHA1) != 0))
return true;
#elif defined(__linux__) && defined(__aarch64__)
if ((getauxval(AT_HWCAP) & HWCAP_SHA1) != 0)
return true;
#elif defined(__linux__) && defined(__aarch32__)
if ((getauxval(AT_HWCAP2) & HWCAP2_SHA1) != 0)
return true;
#elif defined(__APPLE__) && defined(__aarch64__)
return IsAppleMachineARMv8();
#endif
return false;
}
inline bool CPU_QuerySHA256()
{
#if defined(__ANDROID__) && defined(__aarch64__)
if (((android_getCpuFamily() & ANDROID_CPU_FAMILY_ARM64) != 0) &&
((android_getCpuFeatures() & ANDROID_CPU_ARM64_FEATURE_SHA2) != 0))
return true;
#elif defined(__ANDROID__) && defined(__aarch32__)
if (((android_getCpuFamily() & ANDROID_CPU_FAMILY_ARM) != 0) &&
((android_getCpuFeatures() & ANDROID_CPU_ARM_FEATURE_SHA2) != 0))
return true;
#elif defined(__linux__) && defined(__aarch64__)
if ((getauxval(AT_HWCAP) & HWCAP_SHA2) != 0)
return true;
#elif defined(__linux__) && defined(__aarch32__)
if ((getauxval(AT_HWCAP2) & HWCAP2_SHA2) != 0)
return true;
#elif defined(__APPLE__) && defined(__aarch64__)
return IsAppleMachineARMv8();
#endif
return false;
}
inline bool CPU_QuerySHA512()
{
// Some ARMv8.4 features are disabled at the moment
#if defined(__ANDROID__) && defined(__aarch64__) && 0
if (((android_getCpuFamily() & ANDROID_CPU_FAMILY_ARM64) != 0) &&
((android_getCpuFeatures() & ANDROID_CPU_ARM64_FEATURE_SHA512) != 0))
return true;
#elif defined(__ANDROID__) && defined(__aarch32__) && 0
if (((android_getCpuFamily() & ANDROID_CPU_FAMILY_ARM) != 0) &&
((android_getCpuFeatures() & ANDROID_CPU_ARM_FEATURE_SHA512) != 0))
return true;
#elif defined(__linux__) && defined(__aarch64__)
if ((getauxval(AT_HWCAP) & HWCAP_SHA512) != 0)
return true;
#elif defined(__linux__) && defined(__aarch32__)
if ((getauxval(AT_HWCAP2) & HWCAP2_SHA512) != 0)
return true;
#elif defined(__APPLE__) && defined(__aarch64__) && 0
return false;
#endif
return false;
}
inline bool CPU_QuerySHA3()
{
// Some ARMv8.4 features are disabled at the moment
#if defined(__ANDROID__) && defined(__aarch64__) && 0
if (((android_getCpuFamily() & ANDROID_CPU_FAMILY_ARM64) != 0) &&
((android_getCpuFeatures() & ANDROID_CPU_ARM64_FEATURE_SHA3) != 0))
return true;
#elif defined(__ANDROID__) && defined(__aarch32__) && 0
if (((android_getCpuFamily() & ANDROID_CPU_FAMILY_ARM) != 0) &&
((android_getCpuFeatures() & ANDROID_CPU_ARM_FEATURE_SHA3) != 0))
return true;
#elif defined(__linux__) && defined(__aarch64__)
if ((getauxval(AT_HWCAP) & HWCAP_SHA3) != 0)
return true;
#elif defined(__linux__) && defined(__aarch32__)
if ((getauxval(AT_HWCAP2) & HWCAP2_SHA3) != 0)
return true;
#elif defined(__APPLE__) && defined(__aarch64__) && 0
return false;
#endif
return false;
}
inline bool CPU_QuerySM3()
{
// Some ARMv8.4 features are disabled at the moment
#if defined(__ANDROID__) && defined(__aarch64__) && 0
if (((android_getCpuFamily() & ANDROID_CPU_FAMILY_ARM64) != 0) &&
((android_getCpuFeatures() & ANDROID_CPU_ARM64_FEATURE_SM3) != 0))
return true;
#elif defined(__ANDROID__) && defined(__aarch32__) && 0
if (((android_getCpuFamily() & ANDROID_CPU_FAMILY_ARM) != 0) &&
((android_getCpuFeatures() & ANDROID_CPU_ARM_FEATURE_SM3) != 0))
return true;
#elif defined(__linux__) && defined(__aarch64__)
if ((getauxval(AT_HWCAP) & HWCAP_SM3) != 0)
return true;
#elif defined(__linux__) && defined(__aarch32__)
if ((getauxval(AT_HWCAP2) & HWCAP2_SM3) != 0)
return true;
#elif defined(__APPLE__) && defined(__aarch64__) && 0
return false;
#endif
return false;
}
inline bool CPU_QuerySM4()
{
// Some ARMv8.4 features are disabled at the moment
#if defined(__ANDROID__) && defined(__aarch64__) && 0
if (((android_getCpuFamily() & ANDROID_CPU_FAMILY_ARM64) != 0) &&
((android_getCpuFeatures() & ANDROID_CPU_ARM64_FEATURE_SM4) != 0))
return true;
#elif defined(__ANDROID__) && defined(__aarch32__) && 0
if (((android_getCpuFamily() & ANDROID_CPU_FAMILY_ARM) != 0) &&
((android_getCpuFeatures() & ANDROID_CPU_ARM_FEATURE_SM4) != 0))
return true;
#elif defined(__linux__) && defined(__aarch64__)
if ((getauxval(AT_HWCAP) & HWCAP_SM4) != 0)
return true;
#elif defined(__linux__) && defined(__aarch32__)
if ((getauxval(AT_HWCAP2) & HWCAP2_SM4) != 0)
return true;
#elif defined(__APPLE__) && defined(__aarch64__) && 0
return false;
#endif
return false;
}