631 lines
15 KiB
C++
Executable File
631 lines
15 KiB
C++
Executable File
/////////////////////////////////////////////////////////////////////////
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// $Id: fpu_compare.cc,v 1.7 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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extern float_status_t FPU_pre_exception_handling(Bit16u control_word);
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#if BX_SUPPORT_FPU
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#include "softfloatx80.h"
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static int status_word_flags_fpu_compare(int float_relation)
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{
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switch(float_relation) {
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case float_relation_unordered:
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return (FPU_SW_C0|FPU_SW_C2|FPU_SW_C3);
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case float_relation_greater:
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return (0);
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case float_relation_less:
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return (FPU_SW_C0);
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case float_relation_equal:
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return (FPU_SW_C3);
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}
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return (-1); // should never get here
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}
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#endif
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#if BX_SUPPORT_FPU || BX_SUPPORT_SSE >= 1
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void BX_CPU_C::write_eflags_fpu_compare(int float_relation)
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{
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switch(float_relation) {
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case float_relation_unordered:
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setEFlagsOSZAPC(EFlagsZFMask | EFlagsPFMask | EFlagsCFMask);
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break;
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case float_relation_greater:
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setEFlagsOSZAPC(0);
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break;
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case float_relation_less:
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setEFlagsOSZAPC(EFlagsCFMask);
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break;
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case float_relation_equal:
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setEFlagsOSZAPC(EFlagsZFMask);
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break;
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default:
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BX_PANIC(("write_eflags: unknown floating point compare relation"));
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}
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}
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#endif
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void BX_CPU_C::FCOM_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 pop_stack = i->nnn() & 1;
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clear_C1();
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if (IS_TAG_EMPTY(0) || IS_TAG_EMPTY(i->rm()))
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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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/* the masked response */
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setcc(FPU_SW_C0|FPU_SW_C2|FPU_SW_C3);
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if (pop_stack)
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BX_CPU_THIS_PTR the_i387.FPU_pop();
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}
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return;
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}
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float_status_t status =
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FPU_pre_exception_handling(BX_CPU_THIS_PTR the_i387.get_control_word());
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int rc = floatx80_compare(BX_READ_FPU_REG(0), BX_READ_FPU_REG(i->rm()), status);
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if (BX_CPU_THIS_PTR FPU_exception(status.float_exception_flags))
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return;
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setcc(status_word_flags_fpu_compare(rc));
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if (pop_stack)
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BX_CPU_THIS_PTR the_i387.FPU_pop();
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#else
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BX_INFO(("FCOM(P)_STi: required FPU, configure --enable-fpu"));
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#endif
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}
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void BX_CPU_C::FCOMI_ST0_STj(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 pop_stack = i->b1() & 4;
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clear_C1();
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if (IS_TAG_EMPTY(0) || IS_TAG_EMPTY(i->rm()))
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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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/* the masked response */
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setEFlagsOSZAPC(EFlagsZFMask | EFlagsPFMask | EFlagsCFMask);
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if (pop_stack)
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BX_CPU_THIS_PTR the_i387.FPU_pop();
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}
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return;
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}
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float_status_t status =
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FPU_pre_exception_handling(BX_CPU_THIS_PTR the_i387.get_control_word());
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int rc = floatx80_compare(BX_READ_FPU_REG(0), BX_READ_FPU_REG(i->rm()), status);
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if (BX_CPU_THIS_PTR FPU_exception(status.float_exception_flags))
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return;
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BX_CPU_THIS_PTR write_eflags_fpu_compare(rc);
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if (pop_stack)
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BX_CPU_THIS_PTR the_i387.FPU_pop();
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#else
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BX_INFO(("FCOMI(P)_ST0_STj: required FPU, configure --enable-fpu"));
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#endif
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}
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void BX_CPU_C::FUCOMI_ST0_STj(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 pop_stack = i->b1() & 4;
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clear_C1();
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if (IS_TAG_EMPTY(0) || IS_TAG_EMPTY(i->rm()))
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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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/* the masked response */
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setEFlagsOSZAPC(EFlagsZFMask | EFlagsPFMask | EFlagsCFMask);
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if (pop_stack)
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BX_CPU_THIS_PTR the_i387.FPU_pop();
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}
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return;
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}
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float_status_t status =
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FPU_pre_exception_handling(BX_CPU_THIS_PTR the_i387.get_control_word());
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int rc = floatx80_compare_quiet(BX_READ_FPU_REG(0), BX_READ_FPU_REG(i->rm()), status);
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if (BX_CPU_THIS_PTR FPU_exception(status.float_exception_flags))
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return;
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BX_CPU_THIS_PTR write_eflags_fpu_compare(rc);
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if (pop_stack)
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BX_CPU_THIS_PTR the_i387.FPU_pop();
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#else
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BX_INFO(("FUCOMI(P)_ST0_STj: required FPU, configure --enable-fpu"));
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#endif
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}
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void BX_CPU_C::FUCOM_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 pop_stack = i->nnn() & 1;
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if (IS_TAG_EMPTY(0) || IS_TAG_EMPTY(i->rm()))
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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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/* the masked response */
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setcc(FPU_SW_C0|FPU_SW_C2|FPU_SW_C3);
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if (pop_stack)
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BX_CPU_THIS_PTR the_i387.FPU_pop();
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}
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return;
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}
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float_status_t status =
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FPU_pre_exception_handling(BX_CPU_THIS_PTR the_i387.get_control_word());
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int rc = floatx80_compare_quiet(BX_READ_FPU_REG(0), BX_READ_FPU_REG(i->rm()), status);
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if (BX_CPU_THIS_PTR FPU_exception(status.float_exception_flags))
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return;
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setcc(status_word_flags_fpu_compare(rc));
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if (pop_stack)
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BX_CPU_THIS_PTR the_i387.FPU_pop();
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#else
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BX_INFO(("FUCOM(P)_STi: required FPU, configure --enable-fpu"));
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#endif
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}
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void BX_CPU_C::FCOM_SINGLE_REAL(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 pop_stack = i->nnn() & 1;
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clear_C1();
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if (IS_TAG_EMPTY(0))
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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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/* the masked response */
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setcc(FPU_SW_C0|FPU_SW_C2|FPU_SW_C3);
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if (pop_stack)
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BX_CPU_THIS_PTR the_i387.FPU_pop();
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}
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return;
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}
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float32 load_reg;
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read_virtual_dword(i->seg(), RMAddr(i), &load_reg);
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float_status_t status =
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FPU_pre_exception_handling(BX_CPU_THIS_PTR the_i387.get_control_word());
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int rc = floatx80_compare(BX_READ_FPU_REG(0),
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float32_to_floatx80(load_reg, status), status);
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if (BX_CPU_THIS_PTR FPU_exception(status.float_exception_flags))
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return;
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setcc(status_word_flags_fpu_compare(rc));
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if (pop_stack)
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BX_CPU_THIS_PTR the_i387.FPU_pop();
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#else
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BX_INFO(("FCOM(P)_SINGLE_REAL: required FPU, configure --enable-fpu"));
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#endif
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}
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void BX_CPU_C::FCOM_DOUBLE_REAL(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 pop_stack = i->nnn() & 1;
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clear_C1();
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if (IS_TAG_EMPTY(0))
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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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/* the masked response */
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setcc(FPU_SW_C0|FPU_SW_C2|FPU_SW_C3);
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if (pop_stack)
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BX_CPU_THIS_PTR the_i387.FPU_pop();
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}
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return;
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}
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float64 load_reg;
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read_virtual_qword(i->seg(), RMAddr(i), &load_reg);
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float_status_t status =
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FPU_pre_exception_handling(BX_CPU_THIS_PTR the_i387.get_control_word());
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int rc = floatx80_compare(BX_READ_FPU_REG(0),
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float64_to_floatx80(load_reg, status), status);
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if (BX_CPU_THIS_PTR FPU_exception(status.float_exception_flags))
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return;
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setcc(status_word_flags_fpu_compare(rc));
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if (pop_stack)
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BX_CPU_THIS_PTR the_i387.FPU_pop();
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#else
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BX_INFO(("FCOM(P)_DOUBLE_REAL: required FPU, configure --enable-fpu"));
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#endif
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}
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void BX_CPU_C::FICOM_WORD_INTEGER(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 pop_stack = i->nnn() & 1;
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clear_C1();
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if (IS_TAG_EMPTY(0))
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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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/* the masked response */
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setcc(FPU_SW_C0|FPU_SW_C2|FPU_SW_C3);
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if (pop_stack)
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BX_CPU_THIS_PTR the_i387.FPU_pop();
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}
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return;
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}
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Bit16s load_reg;
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read_virtual_word(i->seg(), RMAddr(i), (Bit16u*)(&load_reg));
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float_status_t status =
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FPU_pre_exception_handling(BX_CPU_THIS_PTR the_i387.get_control_word());
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int rc = floatx80_compare(BX_READ_FPU_REG(0),
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int32_to_floatx80((Bit32s)(load_reg)), status);
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if (BX_CPU_THIS_PTR FPU_exception(status.float_exception_flags))
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return;
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setcc(status_word_flags_fpu_compare(rc));
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if (pop_stack)
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BX_CPU_THIS_PTR the_i387.FPU_pop();
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#else
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BX_INFO(("FICOM(P)_WORD_INTEGER: required FPU, configure --enable-fpu"));
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#endif
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}
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void BX_CPU_C::FICOM_DWORD_INTEGER(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 pop_stack = i->nnn() & 1;
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clear_C1();
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if (IS_TAG_EMPTY(0))
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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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/* the masked response */
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setcc(FPU_SW_C0|FPU_SW_C2|FPU_SW_C3);
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if (pop_stack)
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BX_CPU_THIS_PTR the_i387.FPU_pop();
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}
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return;
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}
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Bit32s load_reg;
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read_virtual_dword(i->seg(), RMAddr(i), (Bit32u*)(&load_reg));
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float_status_t status =
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FPU_pre_exception_handling(BX_CPU_THIS_PTR the_i387.get_control_word());
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int rc = floatx80_compare(BX_READ_FPU_REG(0),
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int32_to_floatx80(load_reg), status);
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if (BX_CPU_THIS_PTR FPU_exception(status.float_exception_flags))
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return;
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setcc(status_word_flags_fpu_compare(rc));
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if (pop_stack)
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BX_CPU_THIS_PTR the_i387.FPU_pop();
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#else
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BX_INFO(("FICOM(P)_DWORD_INTEGER: required FPU, configure --enable-fpu"));
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#endif
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}
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/* DE D9 */
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void BX_CPU_C::FCOMPP(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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if (IS_TAG_EMPTY(0) || IS_TAG_EMPTY(1))
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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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/* the masked response */
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setcc(FPU_SW_C0|FPU_SW_C2|FPU_SW_C3);
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BX_CPU_THIS_PTR the_i387.FPU_pop();
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BX_CPU_THIS_PTR the_i387.FPU_pop();
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}
|
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return;
|
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}
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|
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float_status_t status =
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FPU_pre_exception_handling(BX_CPU_THIS_PTR the_i387.get_control_word());
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|
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int rc = floatx80_compare(BX_READ_FPU_REG(0), BX_READ_FPU_REG(1), status);
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if (BX_CPU_THIS_PTR FPU_exception(status.float_exception_flags))
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return;
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|
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setcc(status_word_flags_fpu_compare(rc));
|
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|
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BX_CPU_THIS_PTR the_i387.FPU_pop();
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BX_CPU_THIS_PTR the_i387.FPU_pop();
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#else
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BX_INFO(("FCOMPP: required FPU, configure --enable-fpu"));
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#endif
|
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}
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|
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/* DA E9 */
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void BX_CPU_C::FUCOMPP(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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if (IS_TAG_EMPTY(0) || IS_TAG_EMPTY(1))
|
|
{
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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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/* the masked response */
|
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setcc(FPU_SW_C0|FPU_SW_C2|FPU_SW_C3);
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|
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BX_CPU_THIS_PTR the_i387.FPU_pop();
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BX_CPU_THIS_PTR the_i387.FPU_pop();
|
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}
|
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return;
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}
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|
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float_status_t status =
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FPU_pre_exception_handling(BX_CPU_THIS_PTR the_i387.get_control_word());
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int rc = floatx80_compare_quiet(BX_READ_FPU_REG(0), BX_READ_FPU_REG(1), status);
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if (BX_CPU_THIS_PTR FPU_exception(status.float_exception_flags))
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return;
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|
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setcc(status_word_flags_fpu_compare(rc));
|
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|
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BX_CPU_THIS_PTR the_i387.FPU_pop();
|
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BX_CPU_THIS_PTR the_i387.FPU_pop();
|
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#else
|
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BX_INFO(("FUCOMPP: required FPU, configure --enable-fpu"));
|
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#endif
|
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}
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|
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void BX_CPU_C::FCMOV_ST0_STj(bxInstruction_c *i)
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{
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#if (BX_CPU_LEVEL >= 6) || (BX_CPU_LEVEL_HACKED >= 6)
|
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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);
|
|
int sti_tag = BX_CPU_THIS_PTR the_i387.FPU_gettagi(i->rm());
|
|
|
|
if (st0_tag == FPU_Tag_Empty || sti_tag == FPU_Tag_Empty)
|
|
{
|
|
BX_CPU_THIS_PTR FPU_stack_underflow(0);
|
|
return;
|
|
}
|
|
|
|
floatx80 sti_reg = BX_READ_FPU_REG(i->rm());
|
|
|
|
bx_bool condition = 0;
|
|
switch(i->nnn())
|
|
{
|
|
case 0: condition = get_CF(); break;
|
|
case 1: condition = get_ZF(); break;
|
|
case 2: condition = get_CF() || get_ZF(); break;
|
|
case 3: condition = get_PF(); break;
|
|
default:
|
|
BX_PANIC(("FCMOV_ST0_STj: default case"));
|
|
}
|
|
if (i->b1() & 1)
|
|
condition = !condition;
|
|
|
|
if (condition)
|
|
BX_WRITE_FPU_REGISTER_AND_TAG(sti_reg, sti_tag, 0);
|
|
|
|
#else
|
|
BX_INFO(("FCMOV_ST0_STj: required P6 FPU, configure --enable-fpu, cpu-level=6"));
|
|
UndefinedOpcode(i);
|
|
#endif
|
|
}
|
|
|
|
/* D9 E4 */
|
|
void BX_CPU_C::FTST(bxInstruction_c *i)
|
|
{
|
|
#if BX_SUPPORT_FPU
|
|
BX_CPU_THIS_PTR prepareFPU(i);
|
|
|
|
clear_C1();
|
|
|
|
if (IS_TAG_EMPTY(0))
|
|
{
|
|
BX_CPU_THIS_PTR FPU_exception(FPU_EX_Stack_Underflow);
|
|
|
|
if(BX_CPU_THIS_PTR the_i387.is_IA_masked())
|
|
{
|
|
/* the masked response */
|
|
setcc(FPU_SW_C0|FPU_SW_C2|FPU_SW_C3);
|
|
}
|
|
return;
|
|
}
|
|
|
|
extern const floatx80 Const_Z;
|
|
|
|
float_status_t status =
|
|
FPU_pre_exception_handling(BX_CPU_THIS_PTR the_i387.get_control_word());
|
|
|
|
int rc = floatx80_compare(BX_READ_FPU_REG(0), Const_Z, status);
|
|
|
|
if (BX_CPU_THIS_PTR FPU_exception(status.float_exception_flags))
|
|
return;
|
|
|
|
setcc(status_word_flags_fpu_compare(rc));
|
|
#else
|
|
BX_INFO(("FTST: required FPU, configure --enable-fpu"));
|
|
#endif
|
|
}
|
|
|
|
/* D9 E5 */
|
|
void BX_CPU_C::FXAM(bxInstruction_c *i)
|
|
{
|
|
#if BX_SUPPORT_FPU
|
|
BX_CPU_THIS_PTR prepareFPU(i);
|
|
|
|
floatx80 reg = BX_READ_FPU_REG(0);
|
|
int sign = floatx80_sign(reg);
|
|
|
|
/*
|
|
* Examine the contents of the ST(0) register and sets the condition
|
|
* code flags C0, C2 and C3 in the FPU status word to indicate the
|
|
* class of value or number in the register.
|
|
*/
|
|
|
|
if (IS_TAG_EMPTY(0))
|
|
{
|
|
setcc(FPU_SW_C3|FPU_SW_C1|FPU_SW_C0);
|
|
}
|
|
else
|
|
{
|
|
float_class_t aClass = floatx80_class(reg);
|
|
|
|
switch(aClass)
|
|
{
|
|
case float_zero:
|
|
setcc(FPU_SW_C3|FPU_SW_C1);
|
|
break;
|
|
|
|
case float_NaN:
|
|
// unsupported handled as NaNs
|
|
if (floatx80_is_unsupported(reg)) {
|
|
setcc(FPU_SW_C1);
|
|
} else {
|
|
setcc(FPU_SW_C1|FPU_SW_C0);
|
|
}
|
|
break;
|
|
|
|
case float_negative_inf:
|
|
case float_positive_inf:
|
|
setcc(FPU_SW_C2|FPU_SW_C1|FPU_SW_C0);
|
|
break;
|
|
|
|
case float_denormal:
|
|
setcc(FPU_SW_C3|FPU_SW_C2|FPU_SW_C1);
|
|
break;
|
|
|
|
case float_normalized:
|
|
setcc(FPU_SW_C2|FPU_SW_C1);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* The C1 flag is set to the sign of the value in ST(0), regardless
|
|
* of whether the register is empty or full.
|
|
*/
|
|
if (! sign)
|
|
clear_C1();
|
|
|
|
#else
|
|
BX_INFO(("FXAM: required FPU, configure --enable-fpu"));
|
|
#endif
|
|
}
|