419 lines
9.5 KiB
C++
419 lines
9.5 KiB
C++
/////////////////////////////////////////////////////////////////////////
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// $Id: shift64.cc,v 1.16 2004-12-24 22:44:13 sshwarts Exp $
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/////////////////////////////////////////////////////////////////////////
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//
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// Copyright (C) 2001 MandrakeSoft S.A.
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//
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// MandrakeSoft S.A.
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// 43, rue d'Aboukir
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// 75002 Paris - France
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// http://www.linux-mandrake.com/
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// http://www.mandrakesoft.com/
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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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#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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#if BX_SUPPORT_X86_64
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void BX_CPU_C::SHLD_EqGq(bxInstruction_c *i)
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{
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Bit64u op1_64, op2_64, result_64;
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unsigned count;
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/* op1:op2 << count. result stored in op1 */
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if (i->b1() == 0x1a4)
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count = i->Ib() & 0x3f;
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else // 0x1a5
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count = CL & 0x3f;
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/* op1 is a register or memory reference */
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if (i->modC0()) {
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op1_64 = BX_READ_64BIT_REG(i->rm());
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}
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else {
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/* pointer, segment address pair */
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read_RMW_virtual_qword(i->seg(), RMAddr(i), &op1_64);
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}
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if (!count) return;
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op2_64 = BX_READ_64BIT_REG(i->nnn());
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result_64 = (op1_64 << count) | (op2_64 >> (64 - count));
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/* now write result back to destination */
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if (i->modC0()) {
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BX_WRITE_64BIT_REG(i->rm(), result_64);
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}
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else {
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Write_RMW_virtual_qword(result_64);
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}
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/* set eflags:
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* SHLD count affects the following flags: O,S,Z,A,P,C
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*/
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SET_FLAGS_OSZAPC_64(op1_64, count, result_64, BX_INSTR_SHL64);
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}
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void BX_CPU_C::SHRD_EqGq(bxInstruction_c *i)
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{
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Bit64u op1_64, op2_64, result_64;
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unsigned count;
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if (i->b1() == 0x1ac)
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count = i->Ib() & 0x3f;
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else // 0x1ad
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count = CL & 0x3f;
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/* op1 is a register or memory reference */
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if (i->modC0()) {
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op1_64 = BX_READ_64BIT_REG(i->rm());
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}
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else {
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/* pointer, segment address pair */
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read_RMW_virtual_qword(i->seg(), RMAddr(i), &op1_64);
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}
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if (!count) return;
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op2_64 = BX_READ_64BIT_REG(i->nnn());
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result_64 = (op2_64 << (64 - count)) | (op1_64 >> count);
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/* now write result back to destination */
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if (i->modC0()) {
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BX_WRITE_64BIT_REG(i->rm(), result_64);
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}
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else {
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Write_RMW_virtual_qword(result_64);
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}
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/* set eflags:
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* SHRD count affects the following flags: S,Z,P,C,O
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*/
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set_CF((op1_64 >> (count - 1)) & 0x01);
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set_ZF(result_64 == 0);
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set_SF(result_64 >> 63);
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set_AF(0);
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/* for shift of 1, OF set if sign change occurred. */
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if (count == 1)
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set_OF(((op1_64 ^ result_64) & BX_CONST64(0x8000000000000000)) > 0);
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set_PF_base(result_64);
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}
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void BX_CPU_C::ROL_Eq(bxInstruction_c *i)
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{
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Bit64u op1_64, result_64;
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unsigned count;
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if (i->b1() == 0xc1)
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count = i->Ib() & 0x3f;
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else if (i->b1() == 0xd1)
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count = 1;
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else // (i->b1() == 0xd3)
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count = CL & 0x3f;
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/* op1 is a register or memory reference */
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if (i->modC0()) {
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op1_64 = BX_READ_64BIT_REG(i->rm());
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}
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else {
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/* pointer, segment address pair */
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read_RMW_virtual_qword(i->seg(), RMAddr(i), &op1_64);
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}
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if (! count) return;
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result_64 = (op1_64 << count) | (op1_64 >> (64 - count));
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/* now write result back to destination */
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if (i->modC0()) {
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BX_WRITE_64BIT_REG(i->rm(), result_64);
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}
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else {
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Write_RMW_virtual_qword(result_64);
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}
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/* set eflags:
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* ROL count affects the following flags: C, O
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*/
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bx_bool temp_CF = (result_64 & 0x01);
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set_CF(temp_CF);
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set_OF(temp_CF ^ (result_64 >> 63));
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}
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void BX_CPU_C::ROR_Eq(bxInstruction_c *i)
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{
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Bit64u op1_64, result_64;
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unsigned count;
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if (i->b1() == 0xc1)
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count = i->Ib() & 0x3f;
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else if (i->b1() == 0xd1)
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count = 1;
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else // (i->b1() == 0xd3)
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count = CL & 0x3f;
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/* op1 is a register or memory reference */
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if (i->modC0()) {
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op1_64 = BX_READ_64BIT_REG(i->rm());
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}
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else {
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/* pointer, segment address pair */
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read_RMW_virtual_qword(i->seg(), RMAddr(i), &op1_64);
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}
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if (! count) return;
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result_64 = (op1_64 >> count) | (op1_64 << (64 - count));
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/* now write result back to destination */
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if (i->modC0()) {
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BX_WRITE_64BIT_REG(i->rm(), result_64);
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}
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else {
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Write_RMW_virtual_qword(result_64);
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}
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/* set eflags:
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* ROR count affects the following flags: C, O
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*/
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bx_bool result_b63 = (result_64 & BX_CONST64(0x8000000000000000)) != 0;
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set_CF(result_b63);
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if (count == 1)
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set_OF(((op1_64 ^ result_64) & BX_CONST64(0x8000000000000000)) > 0);
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}
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void BX_CPU_C::RCL_Eq(bxInstruction_c *i)
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{
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Bit64u op1_64, result_64;
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unsigned count;
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if (i->b1() == 0xc1)
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count = i->Ib() & 0x3f;
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else if (i->b1() == 0xd1)
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count = 1;
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else // (i->b1() == 0xd3)
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count = CL & 0x3f;
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/* op1 is a register or memory reference */
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if (i->modC0()) {
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op1_64 = BX_READ_64BIT_REG(i->rm());
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}
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else {
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/* pointer, segment address pair */
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read_RMW_virtual_qword(i->seg(), RMAddr(i), &op1_64);
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}
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if (!count) return;
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if (count==1) {
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result_64 = (op1_64 << 1) | getB_CF();
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}
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else {
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result_64 = (op1_64 << count) | (getB_CF() << (count - 1)) |
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(op1_64 >> (65 - count));
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}
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/* now write result back to destination */
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if (i->modC0()) {
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BX_WRITE_64BIT_REG(i->rm(), result_64);
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}
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else {
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Write_RMW_virtual_qword(result_64);
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}
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/* set eflags:
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* RCL count affects the following flags: C, O
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*/
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bx_bool temp_CF = (op1_64 >> (64 - count)) & 0x01;
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set_CF(temp_CF);
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set_OF(temp_CF ^ (result_64 >> 63));
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}
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void BX_CPU_C::RCR_Eq(bxInstruction_c *i)
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{
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Bit64u op1_64, result_64;
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unsigned count;
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if (i->b1() == 0xc1)
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count = i->Ib() & 0x3f;
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else if (i->b1() == 0xd1)
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count = 1;
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else // (i->b1() == 0xd3)
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count = CL & 0x3f;
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/* op1 is a register or memory reference */
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if (i->modC0()) {
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op1_64 = BX_READ_64BIT_REG(i->rm());
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}
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else {
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/* pointer, segment address pair */
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read_RMW_virtual_qword(i->seg(), RMAddr(i), &op1_64);
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}
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if (!count) return;
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if (count==1) {
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result_64 = (op1_64 >> 1) | (((Bit64u) getB_CF()) << 63);
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}
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else {
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result_64 = (op1_64 >> count) | (getB_CF() << (64 - count)) |
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(op1_64 << (65 - count));
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}
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/* now write result back to destination */
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if (i->modC0()) {
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BX_WRITE_64BIT_REG(i->rm(), result_64);
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}
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else {
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Write_RMW_virtual_qword(result_64);
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}
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/* set eflags:
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* RCR count affects the following flags: C, O
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*/
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set_CF((op1_64 >> (count - 1)) & 0x01);
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if (count == 1)
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set_OF(((op1_64 ^ result_64) & BX_CONST64(0x8000000000000000)) > 0);
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}
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void BX_CPU_C::SHL_Eq(bxInstruction_c *i)
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{
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Bit64u op1_64, result_64;
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unsigned count;
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if (i->b1() == 0xc1)
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count = i->Ib() & 0x3f;
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else if (i->b1() == 0xd1)
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count = 1;
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else // (i->b1() == 0xd3)
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count = CL & 0x3f;
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/* op1 is a register or memory reference */
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if (i->modC0()) {
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op1_64 = BX_READ_64BIT_REG(i->rm());
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}
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else {
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/* pointer, segment address pair */
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read_RMW_virtual_qword(i->seg(), RMAddr(i), &op1_64);
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}
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if (!count) return;
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result_64 = (op1_64 << count);
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/* now write result back to destination */
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if (i->modC0()) {
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BX_WRITE_64BIT_REG(i->rm(), result_64);
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}
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else {
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Write_RMW_virtual_qword(result_64);
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}
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SET_FLAGS_OSZAPC_64(op1_64, count, result_64, BX_INSTR_SHL64);
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}
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void BX_CPU_C::SHR_Eq(bxInstruction_c *i)
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{
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Bit64u op1_64, result_64;
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unsigned count;
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if (i->b1() == 0xc1)
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count = i->Ib() & 0x3f;
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else if (i->b1() == 0xd1)
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count = 1;
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else // (i->b1() == 0xd3)
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count = CL & 0x3f;
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/* op1 is a register or memory reference */
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if (i->modC0()) {
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op1_64 = BX_READ_64BIT_REG(i->rm());
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}
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else {
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/* pointer, segment address pair */
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read_RMW_virtual_qword(i->seg(), RMAddr(i), &op1_64);
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}
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if (!count) return;
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result_64 = (op1_64 >> count);
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/* now write result back to destination */
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if (i->modC0()) {
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BX_WRITE_64BIT_REG(i->rm(), result_64);
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}
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else {
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Write_RMW_virtual_qword(result_64);
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}
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SET_FLAGS_OSZAPC_64(op1_64, count, result_64, BX_INSTR_SHR64);
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}
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void BX_CPU_C::SAR_Eq(bxInstruction_c *i)
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{
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Bit64u op1_64, result_64;
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unsigned count;
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if (i->b1() == 0xc1)
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count = i->Ib() & 0x3f;
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else if (i->b1() == 0xd1)
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count = 1;
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else // (i->b1() == 0xd3)
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count = CL & 0x3f;
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/* op1 is a register or memory reference */
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if (i->modC0()) {
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op1_64 = BX_READ_64BIT_REG(i->rm());
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}
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else {
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/* pointer, segment address pair */
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read_RMW_virtual_qword(i->seg(), RMAddr(i), &op1_64);
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}
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if (!count) return;
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/* count < 64, since only lower 5 bits used */
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if (op1_64 & BX_CONST64(0x8000000000000000)) {
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result_64 = (op1_64 >> count) | (BX_CONST64(0xffffffffffffffff) << (64 - count));
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}
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else {
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result_64 = (op1_64 >> count);
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}
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/* now write result back to destination */
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if (i->modC0()) {
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BX_WRITE_64BIT_REG(i->rm(), result_64);
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}
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else {
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Write_RMW_virtual_qword(result_64);
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}
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SET_FLAGS_OSZAPC_64(op1_64, count, result_64, BX_INSTR_SAR64);
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}
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#endif /* if BX_SUPPORT_X86_64 */
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