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/*
Copyright (c) 2005, 2012, Oracle and/or its affiliates. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
MA 02110-1301 USA.
*/
/* based on Wei Dai's misc.cpp from CryptoPP */
#include "runtime.hpp"
#include "misc.hpp"
#ifdef __GNUC__
#include <signal.h>
#include <setjmp.h>
#endif
#ifdef USE_SYS_STL
#include <algorithm>
#else
#include "algorithm.hpp"
#endif
namespace STL = STL_NAMESPACE;
#ifdef YASSL_PURE_C
void* operator new(size_t sz, TaoCrypt::new_t)
{
void* ptr = malloc(sz ? sz : 1);
if (!ptr) abort();
return ptr;
}
void operator delete(void* ptr, TaoCrypt::new_t)
{
if (ptr) free(ptr);
}
void* operator new[](size_t sz, TaoCrypt::new_t nt)
{
return ::operator new(sz, nt);
}
void operator delete[](void* ptr, TaoCrypt::new_t nt)
{
::operator delete(ptr, nt);
}
/* uncomment to test
// make sure not using globals anywhere by forgetting to use overloaded
void* operator new(size_t sz);
void operator delete(void* ptr);
void* operator new[](size_t sz);
void operator delete[](void* ptr);
*/
namespace TaoCrypt {
new_t tc; // for library new
}
#ifdef __sun
// Handler for pure virtual functions
namespace __Crun {
void pure_error() {
}
}
#endif
#if defined(__ICC) || defined(__INTEL_COMPILER) || (__GNUC__ > 2)
extern "C" {
int __cxa_pure_virtual() {
return 0;
}
} // extern "C"
#endif
#endif // YASSL_PURE_C
namespace TaoCrypt {
inline void XorWords(word* r, const word* a, unsigned int n)
{
for (unsigned int i=0; i<n; i++)
r[i] ^= a[i];
}
void xorbuf(byte* buf, const byte* mask, unsigned int count)
{
if (((size_t)buf | (size_t)mask | count) % WORD_SIZE == 0)
XorWords((word *)buf, (const word *)mask, count/WORD_SIZE);
else
{
for (unsigned int i=0; i<count; i++)
buf[i] ^= mask[i];
}
}
unsigned int BytePrecision(word value)
{
unsigned int i;
for (i=sizeof(value); i; --i)
if (value >> (i-1)*8)
break;
return i;
}
unsigned int BitPrecision(word value)
{
if (!value)
return 0;
unsigned int l = 0,
h = 8 * sizeof(value);
while (h-l > 1)
{
unsigned int t = (l+h)/2;
if (value >> t)
l = t;
else
h = t;
}
return h;
}
word Crop(word value, unsigned int size)
{
if (size < 8*sizeof(value))
return (value & ((1L << size) - 1));
else
return value;
}
#ifdef TAOCRYPT_X86ASM_AVAILABLE
bool HaveCpuId()
{
#ifdef _MSC_VER
__try
{
__asm
{
mov eax, 0
cpuid
}
}
__except (1)
{
return false;
}
return true;
#else
word32 eax, ebx;
__asm__ __volatile
(
/* Put EFLAGS in eax and ebx */
"pushf;"
"pushf;"
"pop %0;"
"movl %0,%1;"
/* Flip the cpuid bit and store back in EFLAGS */
"xorl $0x200000,%0;"
"push %0;"
"popf;"
/* Read EFLAGS again */
"pushf;"
"pop %0;"
"popf"
: "=r" (eax), "=r" (ebx)
:
: "cc"
);
if (eax == ebx)
return false;
return true;
#endif
}
void CpuId(word32 input, word32 *output)
{
#ifdef __GNUC__
__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)
);
#else
__asm
{
mov eax, input
cpuid
mov edi, output
mov [edi], eax
mov [edi+4], ebx
mov [edi+8], ecx
mov [edi+12], edx
}
#endif
}
bool IsPentium()
{
if (!HaveCpuId())
return false;
word32 cpuid[4];
CpuId(0, cpuid);
STL::swap(cpuid[2], cpuid[3]);
if (memcmp(cpuid+1, "GenuineIntel", 12) != 0)
return false;
CpuId(1, cpuid);
byte family = ((cpuid[0] >> 8) & 0xf);
if (family < 5)
return false;
return true;
}
static bool IsMmx()
{
if (!IsPentium())
return false;
word32 cpuid[4];
CpuId(1, cpuid);
if ((cpuid[3] & (1 << 23)) == 0)
return false;
return true;
}
bool isMMX = IsMmx();
#endif // TAOCRYPT_X86ASM_AVAILABLE
} // namespace
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