695 lines
18 KiB
C++
695 lines
18 KiB
C++
/////////////////////////////////////////////////////////////////////////
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// $Id$
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/////////////////////////////////////////////////////////////////////////
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//
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// Copyright (C) 2001-2017 The Bochs Project
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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., 51 Franklin St, Fifth Floor, Boston, MA B 02110-1301 USA
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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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#include "cpu.h"
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#define LOG_THIS BX_CPU_THIS_PTR
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#include "decoder/ia_opcodes.h"
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BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::SHLD_EwGwM(bxInstruction_c *i)
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{
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Bit32u temp_32, result_32;
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unsigned count;
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unsigned of, cf;
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/* op1:op2 << count. result stored in op1 */
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if (i->getIaOpcode() == BX_IA_SHLD_EwGw)
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count = CL;
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else // BX_IA_SHLD_EwGwIb
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count = i->Ib();
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count &= 0x1f; // use only 5 LSB's
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bx_address eaddr = BX_CPU_RESOLVE_ADDR(i);
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Bit32u op1_16 = (Bit32u) read_RMW_virtual_word(i->seg(), eaddr);
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if (count) {
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Bit32u op2_16 = (Bit32u) BX_READ_16BIT_REG(i->src());
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/* count < 32, since only lower 5 bits used */
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temp_32 = (op1_16 << 16) | (op2_16); // double formed by op1:op2
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result_32 = temp_32 << count;
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// hack to act like x86 SHLD when count > 16
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if (count > 16) {
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// for Pentium processor, when count > 16, actually shifting op1:op2:op2 << count,
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// it is the same as shifting op2:op2 by count-16
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// For P6 and later (CPU_LEVEL >= 6), when count > 16, actually shifting op1:op2:op1 << count,
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// which is the same as shifting op2:op1 by count-16
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// The behavior is undefined so both ways are correct, we prefer P6 way of implementation
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result_32 |= (op1_16 << (count - 16));
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}
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Bit16u result_16 = (Bit16u)(result_32 >> 16);
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write_RMW_linear_word(result_16);
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SET_FLAGS_OSZAPC_LOGIC_16(result_16);
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cf = (temp_32 >> (32 - count)) & 0x1;
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of = cf ^ (result_16 >> 15); // of = cf ^ result15
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BX_CPU_THIS_PTR oszapc.set_flags_OxxxxC(of, cf);
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}
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BX_NEXT_INSTR(i);
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}
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BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::SHLD_EwGwR(bxInstruction_c *i)
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{
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Bit32u temp_32, result_32;
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unsigned count;
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unsigned of, cf;
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/* op1:op2 << count. result stored in op1 */
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if (i->getIaOpcode() == BX_IA_SHLD_EwGw)
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count = CL;
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else // BX_IA_SHLD_EwGwIb
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count = i->Ib();
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count &= 0x1f; // use only 5 LSB's
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if (count) {
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Bit32u op1_16 = (Bit32u) BX_READ_16BIT_REG(i->dst());
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Bit32u op2_16 = (Bit32u) BX_READ_16BIT_REG(i->src());
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/* count < 32, since only lower 5 bits used */
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temp_32 = (op1_16 << 16) | (op2_16); // double formed by op1:op2
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result_32 = temp_32 << count;
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// hack to act like x86 SHLD when count > 16
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if (count > 16) {
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// for Pentium processor, when count > 16, actually shifting op1:op2:op2 << count,
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// it is the same as shifting op2:op2 by count-16
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// For P6 and later (CPU_LEVEL >= 6), when count > 16, actually shifting op1:op2:op1 << count,
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// which is the same as shifting op2:op1 by count-16
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// The behavior is undefined so both ways are correct, we prefer P6 way of implementation
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result_32 |= (op1_16 << (count - 16));
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}
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Bit16u result_16 = (Bit16u)(result_32 >> 16);
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BX_WRITE_16BIT_REG(i->dst(), result_16);
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SET_FLAGS_OSZAPC_LOGIC_16(result_16);
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cf = (temp_32 >> (32 - count)) & 0x1;
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of = cf ^ (result_16 >> 15); // of = cf ^ result15
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BX_CPU_THIS_PTR oszapc.set_flags_OxxxxC(of, cf);
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}
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BX_NEXT_INSTR(i);
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}
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BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::SHRD_EwGwM(bxInstruction_c *i)
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{
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Bit32u temp_32, result_32;
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unsigned count;
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unsigned cf, of;
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if (i->getIaOpcode() == BX_IA_SHRD_EwGw)
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count = CL;
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else // BX_IA_SHRD_EwGwIb
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count = i->Ib();
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count &= 0x1f; /* use only 5 LSB's */
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bx_address eaddr = BX_CPU_RESOLVE_ADDR(i);
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Bit32u op1_16 = (Bit32u) read_RMW_virtual_word(i->seg(), eaddr);
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if (count) {
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Bit32u op2_16 = (Bit32u) BX_READ_16BIT_REG(i->src());
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/* count < 32, since only lower 5 bits used */
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temp_32 = (op2_16 << 16) | op1_16; // double formed by op2:op1
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result_32 = temp_32 >> count;
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// hack to act like x86 SHRD when count > 16
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if (count > 16) {
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// for Pentium processor, when count > 16, actually shifting op2:op2:op1 >> count,
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// it is the same as shifting op2:op2 by count-16
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// For P6 and later (CPU_LEVEL >= 6), when count > 16, actually shifting op1:op2:op1 >> count,
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// which is the same as shifting op1:op2 by count-16
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// The behavior is undefined so both ways are correct, we prefer P6 way of implementation
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result_32 |= (op1_16 << (32 - count));
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}
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Bit16u result_16 = (Bit16u) result_32;
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write_RMW_linear_word(result_16);
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SET_FLAGS_OSZAPC_LOGIC_16(result_16);
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cf = (op1_16 >> (count - 1)) & 0x1;
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of = ((Bit16u)((result_16 << 1) ^ result_16) >> 15) & 0x1; // of = result14 ^ result15
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if (count > 16) cf = (op2_16 >> (count - 17)) & 0x1; // undefined flags behavior matching real HW
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BX_CPU_THIS_PTR oszapc.set_flags_OxxxxC(of, cf);
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}
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BX_NEXT_INSTR(i);
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}
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BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::SHRD_EwGwR(bxInstruction_c *i)
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{
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Bit32u temp_32, result_32;
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unsigned count;
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unsigned cf, of;
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if (i->getIaOpcode() == BX_IA_SHRD_EwGw)
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count = CL;
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else // BX_IA_SHRD_EwGwIb
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count = i->Ib();
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count &= 0x1f; /* use only 5 LSB's */
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if (count) {
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Bit32u op1_16 = (Bit32u) BX_READ_16BIT_REG(i->dst());
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Bit32u op2_16 = (Bit32u) BX_READ_16BIT_REG(i->src());
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/* count < 32, since only lower 5 bits used */
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temp_32 = (op2_16 << 16) | op1_16; // double formed by op2:op1
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result_32 = temp_32 >> count;
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// hack to act like x86 SHRD when count > 16
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if (count > 16) {
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// for Pentium processor, when count > 16, actually shifting op2:op2:op1 >> count,
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// it is the same as shifting op2:op2 by count-16
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// For P6 and later (CPU_LEVEL >= 6), when count > 16, actually shifting op1:op2:op1 >> count,
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// which is the same as shifting op1:op2 by count-16
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// The behavior is undefined so both ways are correct, we prefer P6 way of implementation
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result_32 |= (op1_16 << (32 - count));
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}
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Bit16u result_16 = (Bit16u) result_32;
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BX_WRITE_16BIT_REG(i->dst(), result_16);
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SET_FLAGS_OSZAPC_LOGIC_16(result_16);
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cf = (op1_16 >> (count - 1)) & 0x1;
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of = ((Bit16u)((result_16 << 1) ^ result_16) >> 15) & 0x1; // of = result14 ^ result15
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if (count > 16) cf = (op2_16 >> (count - 17)) & 0x1; // undefined flags behavior matching real HW
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BX_CPU_THIS_PTR oszapc.set_flags_OxxxxC(of, cf);
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}
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BX_NEXT_INSTR(i);
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}
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BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::ROL_EwM(bxInstruction_c *i)
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{
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unsigned count;
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unsigned bit0, bit15;
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if (i->getIaOpcode() == BX_IA_ROL_Ew)
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count = CL;
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else
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count = i->Ib();
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bx_address eaddr = BX_CPU_RESOLVE_ADDR(i);
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/* pointer, segment address pair */
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Bit16u op1_16 = read_RMW_virtual_word(i->seg(), eaddr);
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if ((count & 0x0f) == 0) {
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if (count & 0x10) {
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bit0 = (op1_16 & 0x1);
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bit15 = (op1_16 >> 15);
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// of = cf ^ result15
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BX_CPU_THIS_PTR oszapc.set_flags_OxxxxC(bit0 ^ bit15, bit0);
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}
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}
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else {
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count &= 0x0f; // only use bottom 4 bits
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Bit16u result_16 = (op1_16 << count) | (op1_16 >> (16 - count));
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write_RMW_linear_word(result_16);
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bit0 = (result_16 & 0x1);
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bit15 = (result_16 >> 15);
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// of = cf ^ result15
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BX_CPU_THIS_PTR oszapc.set_flags_OxxxxC(bit0 ^ bit15, bit0);
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}
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BX_NEXT_INSTR(i);
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}
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BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::ROL_EwR(bxInstruction_c *i)
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{
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unsigned count;
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unsigned bit0, bit15;
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if (i->getIaOpcode() == BX_IA_ROL_Ew)
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count = CL;
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else
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count = i->Ib();
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Bit16u op1_16 = BX_READ_16BIT_REG(i->dst());
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if ((count & 0x0f) == 0) {
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if (count & 0x10) {
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bit0 = (op1_16 & 0x1);
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bit15 = (op1_16 >> 15);
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// of = cf ^ result15
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BX_CPU_THIS_PTR oszapc.set_flags_OxxxxC(bit0 ^ bit15, bit0);
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}
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}
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else {
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count &= 0x0f; // only use bottom 4 bits
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Bit16u result_16 = (op1_16 << count) | (op1_16 >> (16 - count));
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BX_WRITE_16BIT_REG(i->dst(), result_16);
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bit0 = (result_16 & 0x1);
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bit15 = (result_16 >> 15);
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// of = cf ^ result15
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BX_CPU_THIS_PTR oszapc.set_flags_OxxxxC(bit0 ^ bit15, bit0);
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}
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BX_NEXT_INSTR(i);
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}
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BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::ROR_EwM(bxInstruction_c *i)
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{
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unsigned count;
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unsigned bit14, bit15;
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if (i->getIaOpcode() == BX_IA_ROR_Ew)
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count = CL;
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else
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count = i->Ib();
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bx_address eaddr = BX_CPU_RESOLVE_ADDR(i);
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/* pointer, segment address pair */
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Bit16u op1_16 = read_RMW_virtual_word(i->seg(), eaddr);
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if ((count & 0x0f) == 0) {
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if (count & 0x10) {
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bit14 = (op1_16 >> 14) & 1;
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bit15 = (op1_16 >> 15) & 1;
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// of = result14 ^ result15
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BX_CPU_THIS_PTR oszapc.set_flags_OxxxxC(bit14 ^ bit15, bit15);
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}
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}
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else {
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count &= 0x0f; // use only 4 LSB's
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Bit16u result_16 = (op1_16 >> count) | (op1_16 << (16 - count));
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write_RMW_linear_word(result_16);
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bit14 = (result_16 >> 14) & 1;
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bit15 = (result_16 >> 15) & 1;
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// of = result14 ^ result15
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BX_CPU_THIS_PTR oszapc.set_flags_OxxxxC(bit14 ^ bit15, bit15);
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}
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BX_NEXT_INSTR(i);
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}
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BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::ROR_EwR(bxInstruction_c *i)
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{
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unsigned count;
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unsigned bit14, bit15;
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if (i->getIaOpcode() == BX_IA_ROR_Ew)
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count = CL;
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else
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count = i->Ib();
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Bit16u op1_16 = BX_READ_16BIT_REG(i->dst());
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if ((count & 0x0f) == 0) {
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if (count & 0x10) {
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bit14 = (op1_16 >> 14) & 1;
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bit15 = (op1_16 >> 15) & 1;
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// of = result14 ^ result15
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BX_CPU_THIS_PTR oszapc.set_flags_OxxxxC(bit14 ^ bit15, bit15);
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}
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}
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else {
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count &= 0x0f; // use only 4 LSB's
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Bit16u result_16 = (op1_16 >> count) | (op1_16 << (16 - count));
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BX_WRITE_16BIT_REG(i->dst(), result_16);
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bit14 = (result_16 >> 14) & 1;
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bit15 = (result_16 >> 15) & 1;
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// of = result14 ^ result15
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BX_CPU_THIS_PTR oszapc.set_flags_OxxxxC(bit14 ^ bit15, bit15);
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}
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BX_NEXT_INSTR(i);
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}
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BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::RCL_EwM(bxInstruction_c *i)
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{
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Bit16u result_16;
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unsigned count;
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unsigned of, cf;
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if (i->getIaOpcode() == BX_IA_RCL_Ew)
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count = CL;
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else
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count = i->Ib();
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count = (count & 0x1f) % 17;
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bx_address eaddr = BX_CPU_RESOLVE_ADDR(i);
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/* pointer, segment address pair */
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Bit16u op1_16 = read_RMW_virtual_word(i->seg(), eaddr);
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unsigned temp_CF = getB_CF();
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if (count) {
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if (count==1) {
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result_16 = (op1_16 << 1) | temp_CF;
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}
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else if (count==16) {
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result_16 = (temp_CF << 15) | (op1_16 >> 1);
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}
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else { // 2..15
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result_16 = (op1_16 << count) | (temp_CF << (count - 1)) |
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(op1_16 >> (17 - count));
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}
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write_RMW_linear_word(result_16);
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cf = (op1_16 >> (16 - count)) & 0x1;
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of = cf ^ (result_16 >> 15); // of = cf ^ result15
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BX_CPU_THIS_PTR oszapc.set_flags_OxxxxC(of, cf);
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}
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BX_NEXT_INSTR(i);
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}
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BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::RCL_EwR(bxInstruction_c *i)
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{
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Bit16u result_16;
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unsigned count;
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unsigned of, cf;
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if (i->getIaOpcode() == BX_IA_RCL_Ew)
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count = CL;
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else
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count = i->Ib();
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count = (count & 0x1f) % 17;
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unsigned temp_CF = getB_CF();
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if (count) {
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Bit16u op1_16 = BX_READ_16BIT_REG(i->dst());
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if (count==1) {
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result_16 = (op1_16 << 1) | temp_CF;
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}
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else if (count==16) {
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result_16 = (temp_CF << 15) | (op1_16 >> 1);
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}
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else { // 2..15
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result_16 = (op1_16 << count) | (temp_CF << (count - 1)) |
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(op1_16 >> (17 - count));
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}
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BX_WRITE_16BIT_REG(i->dst(), result_16);
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cf = (op1_16 >> (16 - count)) & 0x1;
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of = cf ^ (result_16 >> 15); // of = cf ^ result15
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BX_CPU_THIS_PTR oszapc.set_flags_OxxxxC(of, cf);
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}
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BX_NEXT_INSTR(i);
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}
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BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::RCR_EwM(bxInstruction_c *i)
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{
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unsigned count;
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unsigned of, cf;
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if (i->getIaOpcode() == BX_IA_RCR_Ew)
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count = CL;
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else
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count = i->Ib();
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count = (count & 0x1f) % 17;
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bx_address eaddr = BX_CPU_RESOLVE_ADDR(i);
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/* pointer, segment address pair */
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Bit16u op1_16 = read_RMW_virtual_word(i->seg(), eaddr);
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if (count) {
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unsigned temp_CF = getB_CF();
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Bit16u result_16 = (op1_16 >> count) | (temp_CF << (16 - count)) |
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(op1_16 << (17 - count));
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write_RMW_linear_word(result_16);
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cf = (op1_16 >> (count - 1)) & 0x1;
|
|
of = ((Bit16u)((result_16 << 1) ^ result_16) >> 15) & 0x1; // of = result15 ^ result14
|
|
BX_CPU_THIS_PTR oszapc.set_flags_OxxxxC(of, cf);
|
|
}
|
|
|
|
BX_NEXT_INSTR(i);
|
|
}
|
|
|
|
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::RCR_EwR(bxInstruction_c *i)
|
|
{
|
|
unsigned count;
|
|
unsigned of, cf;
|
|
|
|
if (i->getIaOpcode() == BX_IA_RCR_Ew)
|
|
count = CL;
|
|
else
|
|
count = i->Ib();
|
|
|
|
count = (count & 0x1f) % 17;
|
|
|
|
if (count) {
|
|
Bit16u op1_16 = BX_READ_16BIT_REG(i->dst());
|
|
|
|
unsigned temp_CF = getB_CF();
|
|
|
|
Bit16u result_16 = (op1_16 >> count) | (temp_CF << (16 - count)) |
|
|
(op1_16 << (17 - count));
|
|
|
|
BX_WRITE_16BIT_REG(i->dst(), result_16);
|
|
|
|
cf = (op1_16 >> (count - 1)) & 0x1;
|
|
of = ((Bit16u)((result_16 << 1) ^ result_16) >> 15) & 0x1; // of = result15 ^ result14
|
|
BX_CPU_THIS_PTR oszapc.set_flags_OxxxxC(of, cf);
|
|
}
|
|
|
|
BX_NEXT_INSTR(i);
|
|
}
|
|
|
|
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::SHL_EwM(bxInstruction_c *i)
|
|
{
|
|
Bit16u result_16;
|
|
unsigned count;
|
|
unsigned of = 0, cf = 0;
|
|
|
|
if (i->getIaOpcode() == BX_IA_SHL_Ew)
|
|
count = CL;
|
|
else
|
|
count = i->Ib();
|
|
|
|
count &= 0x1f; /* use only 5 LSB's */
|
|
|
|
bx_address eaddr = BX_CPU_RESOLVE_ADDR(i);
|
|
/* pointer, segment address pair */
|
|
Bit16u op1_16 = read_RMW_virtual_word(i->seg(), eaddr);
|
|
|
|
if (count) {
|
|
if (count <= 16) {
|
|
result_16 = (op1_16 << count);
|
|
cf = (op1_16 >> (16 - count)) & 0x1;
|
|
of = cf ^ (result_16 >> 15); // of = cf ^ result15
|
|
}
|
|
else {
|
|
result_16 = 0;
|
|
}
|
|
|
|
write_RMW_linear_word(result_16);
|
|
|
|
SET_FLAGS_OSZAPC_LOGIC_16(result_16);
|
|
BX_CPU_THIS_PTR oszapc.set_flags_OxxxxC(of, cf);
|
|
}
|
|
|
|
BX_NEXT_INSTR(i);
|
|
}
|
|
|
|
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::SHL_EwR(bxInstruction_c *i)
|
|
{
|
|
Bit16u result_16;
|
|
unsigned count;
|
|
unsigned of = 0, cf = 0;
|
|
|
|
if (i->getIaOpcode() == BX_IA_SHL_Ew)
|
|
count = CL;
|
|
else
|
|
count = i->Ib();
|
|
|
|
count &= 0x1f; /* use only 5 LSB's */
|
|
|
|
if (count) {
|
|
Bit16u op1_16 = BX_READ_16BIT_REG(i->dst());
|
|
|
|
if (count <= 16) {
|
|
result_16 = (op1_16 << count);
|
|
cf = (op1_16 >> (16 - count)) & 0x1;
|
|
of = cf ^ (result_16 >> 15); // of = cf ^ result15
|
|
}
|
|
else {
|
|
result_16 = 0;
|
|
}
|
|
|
|
BX_WRITE_16BIT_REG(i->dst(), result_16);
|
|
|
|
SET_FLAGS_OSZAPC_LOGIC_16(result_16);
|
|
BX_CPU_THIS_PTR oszapc.set_flags_OxxxxC(of, cf);
|
|
}
|
|
|
|
BX_NEXT_INSTR(i);
|
|
}
|
|
|
|
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::SHR_EwM(bxInstruction_c *i)
|
|
{
|
|
unsigned count;
|
|
unsigned of, cf;
|
|
|
|
if (i->getIaOpcode() == BX_IA_SHR_Ew)
|
|
count = CL;
|
|
else
|
|
count = i->Ib();
|
|
|
|
count &= 0x1f; /* use only 5 LSB's */
|
|
|
|
bx_address eaddr = BX_CPU_RESOLVE_ADDR(i);
|
|
/* pointer, segment address pair */
|
|
Bit16u op1_16 = read_RMW_virtual_word(i->seg(), eaddr);
|
|
|
|
if (count) {
|
|
Bit16u result_16 = (op1_16 >> count);
|
|
|
|
write_RMW_linear_word(result_16);
|
|
|
|
cf = (op1_16 >> (count - 1)) & 0x1;
|
|
// note, that of == result15 if count == 1 and
|
|
// of == 0 if count >= 2
|
|
of = ((Bit16u)((result_16 << 1) ^ result_16) >> 15) & 0x1;
|
|
|
|
SET_FLAGS_OSZAPC_LOGIC_16(result_16);
|
|
BX_CPU_THIS_PTR oszapc.set_flags_OxxxxC(of, cf);
|
|
}
|
|
|
|
BX_NEXT_INSTR(i);
|
|
}
|
|
|
|
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::SHR_EwR(bxInstruction_c *i)
|
|
{
|
|
unsigned count;
|
|
unsigned of, cf;
|
|
|
|
if (i->getIaOpcode() == BX_IA_SHR_Ew)
|
|
count = CL;
|
|
else
|
|
count = i->Ib();
|
|
|
|
count &= 0x1f; /* use only 5 LSB's */
|
|
|
|
if (count) {
|
|
Bit16u op1_16 = BX_READ_16BIT_REG(i->dst());
|
|
Bit16u result_16 = (op1_16 >> count);
|
|
BX_WRITE_16BIT_REG(i->dst(), result_16);
|
|
|
|
cf = (op1_16 >> (count - 1)) & 0x1;
|
|
// note, that of == result15 if count == 1 and
|
|
// of == 0 if count >= 2
|
|
of = ((Bit16u)((result_16 << 1) ^ result_16) >> 15) & 0x1;
|
|
|
|
SET_FLAGS_OSZAPC_LOGIC_16(result_16);
|
|
BX_CPU_THIS_PTR oszapc.set_flags_OxxxxC(of, cf);
|
|
}
|
|
|
|
BX_NEXT_INSTR(i);
|
|
}
|
|
|
|
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::SAR_EwM(bxInstruction_c *i)
|
|
{
|
|
unsigned count, cf;
|
|
|
|
if (i->getIaOpcode() == BX_IA_SAR_Ew)
|
|
count = CL;
|
|
else
|
|
count = i->Ib();
|
|
|
|
count &= 0x1f; /* use only 5 LSB's */
|
|
|
|
bx_address eaddr = BX_CPU_RESOLVE_ADDR(i);
|
|
Bit16u op1_16 = read_RMW_virtual_word(i->seg(), eaddr);
|
|
|
|
if (count) {
|
|
Bit16u result_16 = ((Bit16s) op1_16) >> count;
|
|
|
|
cf = (((Bit16s) op1_16) >> (count - 1)) & 0x1;
|
|
|
|
SET_FLAGS_OSZAPC_LOGIC_16(result_16);
|
|
/* signed overflow cannot happen in SAR instruction */
|
|
BX_CPU_THIS_PTR oszapc.set_flags_OxxxxC(0, cf);
|
|
|
|
write_RMW_linear_word(result_16);
|
|
}
|
|
|
|
BX_NEXT_INSTR(i);
|
|
}
|
|
|
|
BX_INSF_TYPE BX_CPP_AttrRegparmN(1) BX_CPU_C::SAR_EwR(bxInstruction_c *i)
|
|
{
|
|
unsigned count, cf;
|
|
|
|
if (i->getIaOpcode() == BX_IA_SAR_Ew)
|
|
count = CL;
|
|
else
|
|
count = i->Ib();
|
|
|
|
count &= 0x1f; /* use only 5 LSB's */
|
|
|
|
if (count) {
|
|
Bit16u op1_16 = BX_READ_16BIT_REG(i->dst());
|
|
Bit16u result_16 = ((Bit16s) op1_16) >> count;
|
|
BX_WRITE_16BIT_REG(i->dst(), result_16);
|
|
|
|
cf = (((Bit16s) op1_16) >> (count - 1)) & 0x1;
|
|
|
|
SET_FLAGS_OSZAPC_LOGIC_16(result_16);
|
|
/* signed overflow cannot happen in SAR instruction */
|
|
BX_CPU_THIS_PTR oszapc.set_flags_OxxxxC(0, cf);
|
|
}
|
|
|
|
BX_NEXT_INSTR(i);
|
|
}
|