cc694377b9
Bochs instruction emulation handlers won't refer to direct fields of instructions like MODRM.NNN or MODRM.RM anymore. Use generic source/destination indications like SRC1, SRC2 and DST. All handlers are modified to support new notation. In addition fetchDecode module was modified to assign sources to instructions properly. Immediate benefits: - Removal of several duplicated handlers (FMA3 duplicated with FMA4 is a trivial example) - Simpler to understand fetch-decode code Future benefits: - Integration of disassembler into Bochs CPU module, ability to disasm bx_instruction_c instance (planned) Huge patch. Almost all source files wre modified.
126 lines
3.2 KiB
C++
126 lines
3.2 KiB
C++
/////////////////////////////////////////////////////////////////////////
|
|
// $Id$
|
|
/////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// Copyright (C) 2001-2012 The Bochs Project
|
|
//
|
|
// This library 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 2 of the License, or (at your option) any later version.
|
|
//
|
|
// This library 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 this library; if not, write to the Free Software
|
|
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA B 02110-1301 USA
|
|
/////////////////////////////////////////////////////////////////////////
|
|
|
|
#define NEED_CPU_REG_SHORTCUTS 1
|
|
#include "bochs.h"
|
|
#include "cpu.h"
|
|
#define LOG_THIS BX_CPU_THIS_PTR
|
|
|
|
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::MUL_ALEbR(bxInstruction_c *i)
|
|
{
|
|
Bit8u op1 = AL;
|
|
Bit8u op2 = BX_READ_8BIT_REGx(i->src(), i->extend8bitL());
|
|
|
|
Bit32u product_16 = ((Bit16u) op1) * ((Bit16u) op2);
|
|
|
|
Bit8u product_8l = (product_16 & 0xFF);
|
|
Bit8u product_8h = product_16 >> 8;
|
|
|
|
/* now write product back to destination */
|
|
AX = product_16;
|
|
|
|
/* set EFLAGS */
|
|
SET_FLAGS_OSZAPC_LOGIC_8(product_8l);
|
|
if(product_8h != 0)
|
|
{
|
|
ASSERT_FLAGS_OxxxxC();
|
|
}
|
|
|
|
BX_NEXT_INSTR(i);
|
|
}
|
|
|
|
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::IMUL_ALEbR(bxInstruction_c *i)
|
|
{
|
|
Bit8s op1 = AL;
|
|
Bit8s op2 = BX_READ_8BIT_REGx(i->src(), i->extend8bitL());
|
|
|
|
Bit16s product_16 = op1 * op2;
|
|
Bit8u product_8 = (product_16 & 0xFF);
|
|
|
|
/* now write product back to destination */
|
|
AX = product_16;
|
|
|
|
/* set EFLAGS:
|
|
* IMUL r/m8: condition for clearing CF & OF:
|
|
* AX = sign-extend of AL to 16 bits
|
|
*/
|
|
|
|
SET_FLAGS_OSZAPC_LOGIC_8(product_8);
|
|
if(product_16 != (Bit8s) product_16)
|
|
{
|
|
ASSERT_FLAGS_OxxxxC();
|
|
}
|
|
|
|
BX_NEXT_INSTR(i);
|
|
}
|
|
|
|
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::DIV_ALEbR(bxInstruction_c *i)
|
|
{
|
|
Bit8u op2 = BX_READ_8BIT_REGx(i->src(), i->extend8bitL());
|
|
if (op2 == 0) {
|
|
exception(BX_DE_EXCEPTION, 0);
|
|
}
|
|
|
|
Bit16u op1 = AX;
|
|
|
|
Bit16u quotient_16 = op1 / op2;
|
|
Bit8u remainder_8 = op1 % op2;
|
|
Bit8u quotient_8l = quotient_16 & 0xFF;
|
|
|
|
if (quotient_16 != quotient_8l)
|
|
{
|
|
exception(BX_DE_EXCEPTION, 0);
|
|
}
|
|
|
|
/* now write quotient back to destination */
|
|
AL = quotient_8l;
|
|
AH = remainder_8;
|
|
|
|
BX_NEXT_INSTR(i);
|
|
}
|
|
|
|
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::IDIV_ALEbR(bxInstruction_c *i)
|
|
{
|
|
Bit16s op1 = AX;
|
|
|
|
/* check MIN_INT case */
|
|
if (op1 == ((Bit16s)0x8000))
|
|
exception(BX_DE_EXCEPTION, 0);
|
|
|
|
Bit8s op2 = BX_READ_8BIT_REGx(i->src(), i->extend8bitL());
|
|
|
|
if (op2 == 0)
|
|
exception(BX_DE_EXCEPTION, 0);
|
|
|
|
Bit16s quotient_16 = op1 / op2;
|
|
Bit8s remainder_8 = op1 % op2;
|
|
Bit8s quotient_8l = quotient_16 & 0xFF;
|
|
|
|
if (quotient_16 != quotient_8l)
|
|
exception(BX_DE_EXCEPTION, 0);
|
|
|
|
/* now write quotient back to destination */
|
|
AL = quotient_8l;
|
|
AH = remainder_8;
|
|
|
|
BX_NEXT_INSTR(i);
|
|
}
|