107 lines
2.0 KiB
C++
107 lines
2.0 KiB
C++
/******************************************************************************
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COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2011.
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This file is part of LibMaxsi.
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LibMaxsi is free software: you can redistribute it and/or modify it under
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the terms of the GNU Lesser General Public License as published by the Free
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Software Foundation, either version 3 of the License, or (at your option)
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any later version.
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LibMaxsi is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
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more details.
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You should have received a copy of the GNU Lesser General Public License
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along with LibMaxsi. If not, see <http://www.gnu.org/licenses/>.
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c++.cpp
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Implements required C++ stuff for use in the Sortix kernel.
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******************************************************************************/
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#include "platform.h"
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extern "C" void __cxa_pure_virtual()
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{
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// This shouldn't happen. TODO: Possibly crash the kernel here.
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}
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#ifdef PLATFORM_X86
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// TODO: These two stubs are buggy!
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// Divides two 64-bit integers in O(logN). I think.
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extern "C" uint64_t __udivdi3(uint64_t A, uint64_t B)
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{
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uint64_t ACC = 0;
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uint64_t R = 0;
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uint64_t PWR = 1;
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uint64_t EXP = B;
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while ( EXP <= A - ACC )
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{
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R += PWR;
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ACC += EXP;
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if ( 2 * EXP <= A - ACC )
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{
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PWR++;
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EXP *= 2;
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}
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else if ( A - ACC < B )
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{
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break;
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}
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else
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{
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while ( A - ACC < EXP )
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{
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PWR--;
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EXP /= 2;
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}
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}
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}
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return R;
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}
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// Mods two 64-bit integers in O(logN). I think.
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extern "C" uint64_t __umoddi3(uint64_t A, uint64_t B)
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{
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uint64_t ACC = 0;
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uint64_t R = 0;
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uint64_t PWR = 1;
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uint64_t EXP = B;
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while ( EXP <= A - ACC )
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{
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R += PWR;
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ACC += EXP;
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if ( 2 * EXP <= A - ACC )
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{
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PWR++;
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EXP *= 2;
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}
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else if ( A - ACC < B )
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{
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break;
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}
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else
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{
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while ( A - ACC < EXP )
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{
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PWR--;
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EXP /= 2;
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}
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}
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}
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return A - ACC;
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}
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#endif
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