172 lines
4.4 KiB
C++
Executable File
172 lines
4.4 KiB
C++
Executable File
/////////////////////////////////////////////////////////////////////////
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// $Id: fpu_misc.cc,v 1.8 2005-05-12 18:07:46 sshwarts Exp $
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/////////////////////////////////////////////////////////////////////////
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//
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// Copyright (c) 2003 Stanislav Shwartsman
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// Written by Stanislav Shwartsman <stl at fidonet.org.il>
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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//
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/////////////////////////////////////////////////////////////////////////
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#define NEED_CPU_REG_SHORTCUTS 1
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#include "bochs.h"
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#define LOG_THIS BX_CPU_THIS_PTR
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#include "softfloatx80.h"
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/* D9 C8 */
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void BX_CPU_C::FXCH_STi(bxInstruction_c *i)
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{
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#if BX_SUPPORT_FPU
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BX_CPU_THIS_PTR prepareFPU(i);
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int st0_tag = BX_CPU_THIS_PTR the_i387.FPU_gettagi(0);
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int sti_tag = BX_CPU_THIS_PTR the_i387.FPU_gettagi(i->rm());
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floatx80 st0_reg = BX_READ_FPU_REG(0);
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floatx80 sti_reg = BX_READ_FPU_REG(i->rm());
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clear_C1();
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if (st0_tag == FPU_Tag_Empty || sti_tag == FPU_Tag_Empty)
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{
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BX_CPU_THIS_PTR FPU_exception(FPU_EX_Stack_Underflow);
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if(BX_CPU_THIS_PTR the_i387.is_IA_masked())
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{
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/* Masked response */
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if (st0_tag == FPU_Tag_Empty)
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{
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st0_reg = floatx80_default_nan;
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st0_tag = FPU_Tag_Special;
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}
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if (sti_tag == FPU_Tag_Empty)
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{
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sti_reg = floatx80_default_nan;
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sti_tag = FPU_Tag_Special;
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}
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}
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else return;
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}
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BX_WRITE_FPU_REGISTER_AND_TAG(st0_reg, st0_tag, i->rm());
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BX_WRITE_FPU_REGISTER_AND_TAG(sti_reg, sti_tag, 0);
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#else
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BX_INFO(("FXCH_STi: required FPU, configure --enable-fpu"));
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#endif
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}
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/* D9 E0 */
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void BX_CPU_C::FCHS(bxInstruction_c *i)
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{
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#if BX_SUPPORT_FPU
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BX_CPU_THIS_PTR prepareFPU(i);
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int st0_tag = BX_CPU_THIS_PTR the_i387.FPU_gettagi(0);
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if (st0_tag == FPU_Tag_Empty)
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{
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BX_CPU_THIS_PTR FPU_stack_underflow(0);
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return;
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}
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clear_C1();
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floatx80 st0_reg = BX_READ_FPU_REG(0);
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BX_WRITE_FPU_REGISTER_AND_TAG(floatx80_chs(st0_reg), st0_tag, 0);
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#else
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BX_INFO(("FCHS: required FPU, configure --enable-fpu"));
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#endif
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}
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/* D9 E1 */
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void BX_CPU_C::FABS(bxInstruction_c *i)
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{
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#if BX_SUPPORT_FPU
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BX_CPU_THIS_PTR prepareFPU(i);
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int st0_tag = BX_CPU_THIS_PTR the_i387.FPU_gettagi(0);
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if (st0_tag == FPU_Tag_Empty)
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{
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BX_CPU_THIS_PTR FPU_stack_underflow(0);
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return;
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}
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clear_C1();
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floatx80 st0_reg = BX_READ_FPU_REG(0);
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BX_WRITE_FPU_REGISTER_AND_TAG(floatx80_abs(st0_reg), st0_tag, 0);
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#else
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BX_INFO(("FABS: required FPU, configure --enable-fpu"));
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#endif
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}
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/* D9 F6 */
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void BX_CPU_C::FDECSTP(bxInstruction_c *i)
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{
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#if BX_SUPPORT_FPU
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BX_CPU_THIS_PTR prepareFPU(i);
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clear_C1();
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BX_CPU_THIS_PTR the_i387.tos = (BX_CPU_THIS_PTR the_i387.tos-1) & 7;
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#else
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BX_INFO(("FDECSTP: required FPU, configure --enable-fpu"));
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#endif
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}
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/* D9 F7 */
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void BX_CPU_C::FINCSTP(bxInstruction_c *i)
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{
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#if BX_SUPPORT_FPU
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BX_CPU_THIS_PTR prepareFPU(i);
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clear_C1();
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BX_CPU_THIS_PTR the_i387.tos = (BX_CPU_THIS_PTR the_i387.tos+1) & 7;
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#else
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BX_INFO(("FINCSTP: required FPU, configure --enable-fpu"));
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#endif
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}
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/* DD C0 */
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void BX_CPU_C::FFREE_STi(bxInstruction_c *i)
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{
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#if BX_SUPPORT_FPU
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BX_CPU_THIS_PTR prepareFPU(i);
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BX_CPU_THIS_PTR the_i387.FPU_settagi(FPU_Tag_Empty, i->rm());
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#else
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BX_INFO(("FFREE_STi: required FPU, configure --enable-fpu"));
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#endif
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}
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/*
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* Free the st(0) register and pop it from the FPU stack.
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* "Undocumented" by Intel & AMD but mentioned in AMDs Athlon Docs.
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*/
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/* DF C0 */
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void BX_CPU_C::FFREEP_STi(bxInstruction_c *i)
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{
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#if BX_SUPPORT_FPU
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BX_CPU_THIS_PTR prepareFPU(i);
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BX_CPU_THIS_PTR the_i387.FPU_settagi(FPU_Tag_Empty, i->rm());
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BX_CPU_THIS_PTR the_i387.FPU_pop();
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#else
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BX_INFO(("FFREEP_STi: required FPU, configure --enable-fpu"));
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#endif
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}
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