Bochs/bochs/cpu/shift64.cc

/////////////////////////////////////////////////////////////////////////
// $Id$
/////////////////////////////////////////////////////////////////////////
//
//  Copyright (C) 2001-2018  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

#if BX_SUPPORT_X86_64

#include "decoder/ia_opcodes.h"

void BX_CPP_AttrRegparmN(1) BX_CPU_C::SHLD_EqGqM(bxInstruction_c *i)
{
  Bit64u op1_64, op2_64, result_64;
  unsigned count;
  unsigned cf, of;

  bx_address eaddr = BX_CPU_RESOLVE_ADDR_64(i);

  /* pointer, segment address pair */
  op1_64 = read_RMW_linear_qword(i->seg(), get_laddr64(i->seg(), eaddr));

  if (i->getIaOpcode() == BX_IA_SHLD_EqGq)
    count = CL;
  else // BX_IA_SHLD_EqGqIb
    count = i->Ib();

  count &= 0x3f; // use only 6 LSB's

  if (count) {
    op2_64 = BX_READ_64BIT_REG(i->src());

    result_64 = (op1_64 << count) | (op2_64 >> (64 - count));

    write_RMW_linear_qword(result_64);

    SET_FLAGS_OSZAPC_LOGIC_64(result_64);

    cf = (op1_64 >> (64 - count)) & 0x1;
    of = cf ^ (result_64 >> 63); // of = cf ^ result63
    BX_CPU_THIS_PTR oszapc.set_flags_OxxxxC(of, cf);
  }

  BX_NEXT_INSTR(i);
}

void BX_CPP_AttrRegparmN(1) BX_CPU_C::SHLD_EqGqR(bxInstruction_c *i)
{
  Bit64u op1_64, op2_64, result_64;
  unsigned count;
  unsigned cf, of;

  if (i->getIaOpcode() == BX_IA_SHLD_EqGq)
    count = CL;
  else // BX_IA_SHLD_EqGqIb
    count = i->Ib();

  count &= 0x3f; // use only 6 LSB's

  if (count) {
    op1_64 = BX_READ_64BIT_REG(i->dst());
    op2_64 = BX_READ_64BIT_REG(i->src());

    result_64 = (op1_64 << count) | (op2_64 >> (64 - count));

    BX_WRITE_64BIT_REG(i->dst(), result_64);

    SET_FLAGS_OSZAPC_LOGIC_64(result_64);

    cf = (op1_64 >> (64 - count)) & 0x1;
    of = cf ^ (result_64 >> 63); // of = cf ^ result63
    BX_CPU_THIS_PTR oszapc.set_flags_OxxxxC(of, cf);
  }

  BX_NEXT_INSTR(i);
}

void BX_CPP_AttrRegparmN(1) BX_CPU_C::SHRD_EqGqM(bxInstruction_c *i)
{
  Bit64u op1_64, op2_64, result_64;
  unsigned count;
  unsigned cf, of;

  bx_address eaddr = BX_CPU_RESOLVE_ADDR_64(i);

  /* pointer, segment address pair */
  op1_64 = read_RMW_linear_qword(i->seg(), get_laddr64(i->seg(), eaddr));

  if (i->getIaOpcode() == BX_IA_SHRD_EqGq)
    count = CL;
  else // BX_IA_SHRD_EqGqIb
    count = i->Ib();

  count &= 0x3f; // use only 6 LSB's

  if (count) {
    op2_64 = BX_READ_64BIT_REG(i->src());

    result_64 = (op2_64 << (64 - count)) | (op1_64 >> count);

    write_RMW_linear_qword(result_64);

    SET_FLAGS_OSZAPC_LOGIC_64(result_64);

    cf = (op1_64 >> (count - 1)) & 0x1;
    of = ((result_64 << 1) ^ result_64) >> 63; // of = result62 ^ result63
    BX_CPU_THIS_PTR oszapc.set_flags_OxxxxC(of, cf);
  }

  BX_NEXT_INSTR(i);
}

void BX_CPP_AttrRegparmN(1) BX_CPU_C::SHRD_EqGqR(bxInstruction_c *i)
{
  Bit64u op1_64, op2_64, result_64;
  unsigned count;
  unsigned cf, of;

  if (i->getIaOpcode() == BX_IA_SHRD_EqGq)
    count = CL;
  else // BX_IA_SHRD_EqGqIb
    count = i->Ib();

  count &= 0x3f; // use only 6 LSB's

  if (count) {
    op1_64 = BX_READ_64BIT_REG(i->dst());
    op2_64 = BX_READ_64BIT_REG(i->src());

    result_64 = (op2_64 << (64 - count)) | (op1_64 >> count);

    BX_WRITE_64BIT_REG(i->dst(), result_64);

    SET_FLAGS_OSZAPC_LOGIC_64(result_64);

    cf = (op1_64 >> (count - 1)) & 0x1;
    of = ((result_64 << 1) ^ result_64) >> 63; // of = result62 ^ result63
    BX_CPU_THIS_PTR oszapc.set_flags_OxxxxC(of, cf);
  }

  BX_NEXT_INSTR(i);
}

void BX_CPP_AttrRegparmN(1) BX_CPU_C::ROL_EqM(bxInstruction_c *i)
{
  unsigned count;

  bx_address eaddr = BX_CPU_RESOLVE_ADDR_64(i);

  Bit64u op1_64 = read_RMW_linear_qword(i->seg(), get_laddr64(i->seg(), eaddr));

  if (i->getIaOpcode() == BX_IA_ROL_Eq)
    count = CL;
  else
    count = i->Ib();

  count &= 0x3f;

  if (count) {
    Bit64u result_64 = (op1_64 << count) | (op1_64 >> (64 - count));

    write_RMW_linear_qword(result_64);

    unsigned bit0  = (result_64 & 0x1);
    unsigned bit63 = (result_64 >> 63);
    // of = cf ^ result63
    BX_CPU_THIS_PTR oszapc.set_flags_OxxxxC(bit0 ^ bit63, bit0);
  }

  BX_NEXT_INSTR(i);
}

void BX_CPP_AttrRegparmN(1) BX_CPU_C::ROL_EqR(bxInstruction_c *i)
{
  unsigned count;

  if (i->getIaOpcode() == BX_IA_ROL_Eq)
    count = CL;
  else
    count = i->Ib();

  count &= 0x3f;
  
  if (count) {
    Bit64u op1_64 = BX_READ_64BIT_REG(i->dst());
    Bit64u result_64 = (op1_64 << count) | (op1_64 >> (64 - count));
    BX_WRITE_64BIT_REG(i->dst(), result_64);

    unsigned bit0  = (result_64 & 0x1);
    unsigned bit63 = (result_64 >> 63);
    // of = cf ^ result63
    BX_CPU_THIS_PTR oszapc.set_flags_OxxxxC(bit0 ^ bit63, bit0);
  }

  BX_NEXT_INSTR(i);
}

void BX_CPP_AttrRegparmN(1) BX_CPU_C::ROR_EqM(bxInstruction_c *i)
{
  unsigned count;

  bx_address eaddr = BX_CPU_RESOLVE_ADDR_64(i);

  Bit64u op1_64 = read_RMW_linear_qword(i->seg(), get_laddr64(i->seg(), eaddr));

  if (i->getIaOpcode() == BX_IA_ROR_Eq)
    count = CL;
  else
    count = i->Ib();

  count &= 0x3f;

  if (count) {
    Bit64u result_64 = (op1_64 >> count) | (op1_64 << (64 - count));

    write_RMW_linear_qword(result_64);

    unsigned bit63 = (result_64 >> 63) & 1;
    unsigned bit62 = (result_64 >> 62) & 1;
    // of = result62 ^ result63
    BX_CPU_THIS_PTR oszapc.set_flags_OxxxxC(bit62 ^ bit63, bit63);
  }

  BX_NEXT_INSTR(i);
}

void BX_CPP_AttrRegparmN(1) BX_CPU_C::ROR_EqR(bxInstruction_c *i)
{
  unsigned count;

  if (i->getIaOpcode() == BX_IA_ROR_Eq)
    count = CL;
  else
    count = i->Ib();

  count &= 0x3f;

  if (count) {
    Bit64u op1_64 = BX_READ_64BIT_REG(i->dst());
    Bit64u result_64 = (op1_64 >> count) | (op1_64 << (64 - count));
    BX_WRITE_64BIT_REG(i->dst(), result_64);

    unsigned bit63 = (result_64 >> 63) & 1;
    unsigned bit62 = (result_64 >> 62) & 1;
    // of = result62 ^ result63
    BX_CPU_THIS_PTR oszapc.set_flags_OxxxxC(bit62 ^ bit63, bit63);
  }

  BX_NEXT_INSTR(i);
}

void BX_CPP_AttrRegparmN(1) BX_CPU_C::RCL_EqM(bxInstruction_c *i)
{
  Bit64u result_64;
  unsigned count;
  unsigned cf, of;

  bx_address eaddr = BX_CPU_RESOLVE_ADDR_64(i);

  Bit64u op1_64 = read_RMW_linear_qword(i->seg(), get_laddr64(i->seg(), eaddr));

  if (i->getIaOpcode() == BX_IA_RCL_Eq)
    count = CL;
  else
    count = i->Ib();

  count &= 0x3f;

  if (!count) {
    BX_NEXT_INSTR(i);
  }

  Bit64u temp_CF = getB_CF();

  if (count==1) {
    result_64 = (op1_64 << 1) | temp_CF;
  }
  else {
    result_64 = (op1_64 << count) | (temp_CF << (count - 1)) |
                (op1_64 >> (65 - count));
  }

  write_RMW_linear_qword(result_64);

  cf = (op1_64 >> (64 - count)) & 0x1;
  of = cf ^ (result_64 >> 63); // of = cf ^ result63
  BX_CPU_THIS_PTR oszapc.set_flags_OxxxxC(of, cf);

  BX_NEXT_INSTR(i);
}

void BX_CPP_AttrRegparmN(1) BX_CPU_C::RCL_EqR(bxInstruction_c *i)
{
  Bit64u result_64;
  unsigned count;
  unsigned cf, of;

  if (i->getIaOpcode() == BX_IA_RCL_Eq)
    count = CL;
  else
    count = i->Ib();

  count &= 0x3f;

  if (!count) {
    BX_NEXT_INSTR(i);
  }

  Bit64u op1_64 = BX_READ_64BIT_REG(i->dst());

  Bit64u temp_CF = getB_CF();

  if (count==1) {
    result_64 = (op1_64 << 1) | temp_CF;
  }
  else {
    result_64 = (op1_64 << count) | (temp_CF << (count - 1)) |
                (op1_64 >> (65 - count));
  }

  BX_WRITE_64BIT_REG(i->dst(), result_64);

  cf = (op1_64 >> (64 - count)) & 0x1;
  of = cf ^ (result_64 >> 63); // of = cf ^ result63
  BX_CPU_THIS_PTR oszapc.set_flags_OxxxxC(of, cf);

  BX_NEXT_INSTR(i);
}

void BX_CPP_AttrRegparmN(1) BX_CPU_C::RCR_EqM(bxInstruction_c *i)
{
  Bit64u result_64;
  unsigned count;
  unsigned of, cf;

  bx_address eaddr = BX_CPU_RESOLVE_ADDR_64(i);

  Bit64u op1_64 = read_RMW_linear_qword(i->seg(), get_laddr64(i->seg(), eaddr));

  if (i->getIaOpcode() == BX_IA_RCR_Eq)
    count = CL;
  else
    count = i->Ib();

  count &= 0x3f;

  if (!count) {
    BX_NEXT_INSTR(i);
  }

  Bit64u temp_CF = getB_CF();

  if (count==1) {
    result_64 = (op1_64 >> 1) | (temp_CF << 63);
  }
  else {
    result_64 = (op1_64 >> count) | (temp_CF << (64 - count)) |
                (op1_64 << (65 - count));
  }

  write_RMW_linear_qword(result_64);

  cf = (op1_64 >> (count - 1)) & 0x1;
  of = ((result_64 << 1) ^ result_64) >> 63;
  BX_CPU_THIS_PTR oszapc.set_flags_OxxxxC(of, cf);

  BX_NEXT_INSTR(i);
}

void BX_CPP_AttrRegparmN(1) BX_CPU_C::RCR_EqR(bxInstruction_c *i)
{
  Bit64u result_64;
  unsigned count;
  unsigned of, cf;

  if (i->getIaOpcode() == BX_IA_RCR_Eq)
    count = CL;
  else
    count = i->Ib();

  count &= 0x3f;

  if (!count) {
    BX_NEXT_INSTR(i);
  }

  Bit64u op1_64 = BX_READ_64BIT_REG(i->dst());

  Bit64u temp_CF = getB_CF();

  if (count==1) {
    result_64 = (op1_64 >> 1) | (temp_CF << 63);
  }
  else {
    result_64 = (op1_64 >> count) | (temp_CF << (64 - count)) |
                (op1_64 << (65 - count));
  }

  BX_WRITE_64BIT_REG(i->dst(), result_64);

  cf = (op1_64 >> (count - 1)) & 0x1;
  of = ((result_64 << 1) ^ result_64) >> 63;
  BX_CPU_THIS_PTR oszapc.set_flags_OxxxxC(of, cf);

  BX_NEXT_INSTR(i);
}

void BX_CPP_AttrRegparmN(1) BX_CPU_C::SHL_EqM(bxInstruction_c *i)
{
  unsigned count;

  bx_address eaddr = BX_CPU_RESOLVE_ADDR_64(i);

  Bit64u op1_64 = read_RMW_linear_qword(i->seg(), get_laddr64(i->seg(), eaddr));

  if (i->getIaOpcode() == BX_IA_SHL_Eq)
    count = CL;
  else
    count = i->Ib();

  count &= 0x3f;

  if (count) {
    /* count < 64, since only lower 6 bits used */
    Bit64u result_64 = (op1_64 << count);

    unsigned cf = (op1_64 >> (64 - count)) & 0x1;
    unsigned of = cf ^ (result_64 >> 63);

    write_RMW_linear_qword(result_64);

    SET_FLAGS_OSZAPC_LOGIC_64(result_64);
    BX_CPU_THIS_PTR oszapc.set_flags_OxxxxC(of, cf);
  }

  BX_NEXT_INSTR(i);
}

void BX_CPP_AttrRegparmN(1) BX_CPU_C::SHL_EqR(bxInstruction_c *i)
{
  Bit64u op1_64, result_64;
  unsigned count;
  unsigned cf, of;

  if (i->getIaOpcode() == BX_IA_SHL_Eq)
    count = CL;
  else
    count = i->Ib();

  count &= 0x3f;

  if (count) {
    op1_64 = BX_READ_64BIT_REG(i->dst());
    /* count < 64, since only lower 6 bits used */
    result_64 = (op1_64 << count);
    BX_WRITE_64BIT_REG(i->dst(), result_64);

    cf = (op1_64 >> (64 - count)) & 0x1;
    of = cf ^ (result_64 >> 63);
    SET_FLAGS_OSZAPC_LOGIC_64(result_64);
    BX_CPU_THIS_PTR oszapc.set_flags_OxxxxC(of, cf);
  }

  BX_NEXT_INSTR(i);
}

void BX_CPP_AttrRegparmN(1) BX_CPU_C::SHR_EqM(bxInstruction_c *i)
{
  unsigned count;

  bx_address eaddr = BX_CPU_RESOLVE_ADDR_64(i);

  Bit64u op1_64 = read_RMW_linear_qword(i->seg(), get_laddr64(i->seg(), eaddr));

  if (i->getIaOpcode() == BX_IA_SHR_Eq)
    count = CL;
  else
    count = i->Ib();

  count &= 0x3f;

  if (count) {
    Bit64u result_64 = (op1_64 >> count);

    write_RMW_linear_qword(result_64);

    unsigned cf = (op1_64 >> (count - 1)) & 0x1;
    // note, that of == result63 if count == 1 and
    //            of == 0        if count >= 2
    unsigned of = ((result_64 << 1) ^ result_64) >> 63;

    SET_FLAGS_OSZAPC_LOGIC_64(result_64);
    BX_CPU_THIS_PTR oszapc.set_flags_OxxxxC(of, cf);
  }

  BX_NEXT_INSTR(i);
}

void BX_CPP_AttrRegparmN(1) BX_CPU_C::SHR_EqR(bxInstruction_c *i)
{
  unsigned count;

  if (i->getIaOpcode() == BX_IA_SHR_Eq)
    count = CL;
  else
    count = i->Ib();

  count &= 0x3f;

  if (count) {
    Bit64u op1_64 = BX_READ_64BIT_REG(i->dst());
    Bit64u result_64 = (op1_64 >> count);
    BX_WRITE_64BIT_REG(i->dst(), result_64);

    unsigned cf = (op1_64 >> (count - 1)) & 0x1;
    // note, that of == result63 if count == 1 and
    //            of == 0        if count >= 2
    unsigned of = ((result_64 << 1) ^ result_64) >> 63;

    SET_FLAGS_OSZAPC_LOGIC_64(result_64);
    BX_CPU_THIS_PTR oszapc.set_flags_OxxxxC(of, cf);
  }

  BX_NEXT_INSTR(i);
}

void BX_CPP_AttrRegparmN(1) BX_CPU_C::SAR_EqM(bxInstruction_c *i)
{
  unsigned count;

  bx_address eaddr = BX_CPU_RESOLVE_ADDR_64(i);

  Bit64u op1_64 = read_RMW_linear_qword(i->seg(), get_laddr64(i->seg(), eaddr));

  if (i->getIaOpcode() == BX_IA_SAR_Eq)
    count = CL;
  else
    count = i->Ib();

  count &= 0x3f;

  if (count) {
    /* count < 64, since only lower 6 bits used */
    Bit64u result_64 = ((Bit64s) op1_64) >> count;

    write_RMW_linear_qword(result_64);

    SET_FLAGS_OSZAPC_LOGIC_64(result_64);
    unsigned cf = (op1_64 >> (count - 1)) & 1;
    BX_CPU_THIS_PTR oszapc.set_flags_OxxxxC(0, cf); /* signed overflow cannot happen in SAR instruction */
  }

  BX_NEXT_INSTR(i);
}

void BX_CPP_AttrRegparmN(1) BX_CPU_C::SAR_EqR(bxInstruction_c *i)
{
  unsigned count;

  if (i->getIaOpcode() == BX_IA_SAR_Eq)
    count = CL;
  else
    count = i->Ib();

  count &= 0x3f;

  if (count) {
    Bit64u op1_64 = BX_READ_64BIT_REG(i->dst());

    /* count < 64, since only lower 6 bits used */
    Bit64u result_64 = ((Bit64s) op1_64) >> count;

    BX_WRITE_64BIT_REG(i->dst(), result_64);

    SET_FLAGS_OSZAPC_LOGIC_64(result_64);
    unsigned cf = (op1_64 >> (count - 1)) & 1;
    BX_CPU_THIS_PTR oszapc.set_flags_OxxxxC(0, cf); /* signed overflow cannot happen in SAR instruction */
  }

  BX_NEXT_INSTR(i);
}

#endif /* if BX_SUPPORT_X86_64 */