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sortix--sortix/libmaxsi/c++.cpp
Jonas 'Sortie' Termansen db79994e64 Refactored all the sortix headers into a include directory.
Also got rid of trailing white space. That corrupted .git/.

Big ass-commit because of recovered .git directory.
2012-03-22 00:52:29 +01:00

151 lines
3.2 KiB
C++

/******************************************************************************
COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2011.
This file is part of LibMaxsi.
LibMaxsi is free software: you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the Free
Software Foundation, either version 3 of the License, or (at your option)
any later version.
LibMaxsi 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 Lesser General Public License for
more details.
You should have received a copy of the GNU Lesser General Public License
along with LibMaxsi. If not, see <http://www.gnu.org/licenses/>.
c++.cpp
Implements required C++ stuff for use in the Sortix kernel.
******************************************************************************/
#include <libmaxsi/platform.h>
extern "C" void __cxa_pure_virtual()
{
// This shouldn't happen. TODO: Possibly crash the kernel here.
}
#ifdef PLATFORM_X86
extern "C" uint64_t __udivdi3(uint64_t a, uint64_t b)
{
uint64_t result = 0;
uint64_t power = 1;
uint64_t remainder = a;
uint64_t divisor = b;
while ( divisor * 2 <= remainder )
{
power *= 2;
divisor *= 2;
}
while ( divisor <= remainder )
{
remainder -= divisor;
result += power;
while ( power > 1 && remainder < divisor )
{
divisor /= 2;
power /= 2;
}
}
return result;
}
extern "C" uint64_t __umoddi3(uint64_t a, uint64_t b)
{
uint64_t result = 0;
uint64_t power = 1;
uint64_t remainder = a;
uint64_t divisor = b;
while ( divisor * 2 <= remainder )
{
power *= 2;
divisor *= 2;
}
while ( divisor <= remainder )
{
remainder -= divisor;
result += power;
while ( power > 1 && remainder < divisor )
{
divisor /= 2;
power /= 2;
}
}
return remainder;
}
extern "C" int64_t __divdi3(int64_t a, int64_t b)
{
if ( a >= 0 && b >= 0 )
{
uint64_t numer = a;
uint64_t denom = b;
uint64_t result = __udivdi3(numer, denom);
return +((int64_t) result);
}
else if ( a < 0 && b >= 0 )
{
uint64_t numer = -a;
uint64_t denom = b;
uint64_t result = __udivdi3(numer, denom);
return -((int64_t) result);
}
else if ( a >= 0 && b < 0 )
{
uint64_t numer = a;
uint64_t denom = -b;
uint64_t result = __udivdi3(numer, denom);
return -((int64_t) result);
}
else // if ( a < 0 && b < 0 )
{
uint64_t numer = -a;
uint64_t denom = -b;
uint64_t result = __udivdi3(numer, denom);
return +((int64_t) result);
}
}
extern "C" int64_t __moddi3(int64_t a, int64_t b)
{
if ( a >= 0 && b >= 0 )
{
uint64_t numer = a;
uint64_t denom = b;
uint64_t result = __umoddi3(numer, denom);
return +((int64_t) result);
}
else if ( a < 0 && b >= 0 )
{
uint64_t numer = -a;
uint64_t denom = b;
uint64_t result = __umoddi3(numer, denom);
return -((int64_t) result);
}
else if ( a >= 0 && b < 0 )
{
uint64_t numer = a;
uint64_t denom = -b;
uint64_t result = __umoddi3(numer, denom);
return +((int64_t) result);
}
else // if ( a < 0 && b < 0 )
{
uint64_t numer = -a;
uint64_t denom = -b;
uint64_t result = __umoddi3(numer, denom);
return -((int64_t) result);
}
}
#endif