8c783bc329
Removed all potentially unsafe and duplicated code in setFLAGS methods to avoid such kind of problems in future
316 lines
6.9 KiB
C++
316 lines
6.9 KiB
C++
/////////////////////////////////////////////////////////////////////////
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// $Id: flag_ctrl.cc,v 1.22 2005-09-29 17:32:32 sshwarts Exp $
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/////////////////////////////////////////////////////////////////////////
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//
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// Copyright (C) 2002 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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void BX_CPU_C::SAHF(bxInstruction_c *i)
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{
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set_SF((AH & 0x80) >> 7);
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set_ZF((AH & 0x40) >> 6);
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set_AF((AH & 0x10) >> 4);
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set_CF(AH & 0x01);
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set_PF((AH & 0x04) >> 2);
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}
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void BX_CPU_C::LAHF(bxInstruction_c *i)
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{
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AH = (get_SF() ? 0x80 : 0) |
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(get_ZF() ? 0x40 : 0) |
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(get_AF() ? 0x10 : 0) |
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(get_PF() ? 0x04 : 0) |
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(0x02) |
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(get_CF() ? 0x01 : 0);
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}
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void BX_CPU_C::CLC(bxInstruction_c *i)
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{
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clear_CF ();
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}
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void BX_CPU_C::STC(bxInstruction_c *i)
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{
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assert_CF();
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}
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void BX_CPU_C::CLI(bxInstruction_c *i)
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{
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Bit32u IOPL = BX_CPU_THIS_PTR get_IOPL();
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Bit32u cpl = CPL;
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#if BX_CPU_LEVEL >= 2
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if (protected_mode())
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{
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#if BX_SUPPORT_VME
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if (BX_CPU_THIS_PTR cr4.get_PVI() && (cpl == 3))
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{
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if (IOPL < 3) {
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BX_CPU_THIS_PTR clear_VIF();
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return;
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}
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}
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else
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#endif
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{
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if (IOPL < cpl) {
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exception(BX_GP_EXCEPTION, 0, 0);
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return;
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}
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}
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}
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#if BX_CPU_LEVEL >= 3
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else if (v8086_mode())
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{
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if (IOPL != 3) {
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#if BX_SUPPORT_VME
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if (BX_CPU_THIS_PTR cr4.get_VME())
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{
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BX_CPU_THIS_PTR clear_VIF();
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return;
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}
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#endif
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exception(BX_GP_EXCEPTION, 0, 0);
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return;
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}
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}
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#endif
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#endif
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BX_CPU_THIS_PTR clear_IF ();
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}
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void BX_CPU_C::STI(bxInstruction_c *i)
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{
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Bit32u IOPL = BX_CPU_THIS_PTR get_IOPL();
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Bit32u cpl = CPL;
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#if BX_CPU_LEVEL >= 2
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if (protected_mode())
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{
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#if BX_SUPPORT_VME
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if (BX_CPU_THIS_PTR cr4.get_PVI())
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{
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if (cpl == 3) {
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if (IOPL < 3)
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{
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if (! BX_CPU_THIS_PTR get_VIP ())
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{
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BX_CPU_THIS_PTR assert_VIF();
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return;
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}
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exception(BX_GP_EXCEPTION, 0, 0);
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}
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}
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}
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#endif
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if (cpl > IOPL)
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exception(BX_GP_EXCEPTION, 0, 0);
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}
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#if BX_CPU_LEVEL >= 3
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else if (v8086_mode())
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{
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if (IOPL != 3) {
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#if BX_SUPPORT_VME
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if (! BX_CPU_THIS_PTR get_VIP () && BX_CPU_THIS_PTR cr4.get_VME())
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{
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BX_CPU_THIS_PTR assert_VIF();
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return;
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}
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#endif
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exception(BX_GP_EXCEPTION, 0, 0);
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}
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}
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#endif
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#endif
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if (!BX_CPU_THIS_PTR get_IF ()) {
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BX_CPU_THIS_PTR assert_IF ();
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BX_CPU_THIS_PTR inhibit_mask |= BX_INHIBIT_INTERRUPTS;
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BX_CPU_THIS_PTR async_event = 1;
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}
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}
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void BX_CPU_C::CLD(bxInstruction_c *i)
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{
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BX_CPU_THIS_PTR clear_DF ();
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}
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void BX_CPU_C::STD(bxInstruction_c *i)
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{
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BX_CPU_THIS_PTR assert_DF ();
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}
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void BX_CPU_C::CMC(bxInstruction_c *i)
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{
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set_CF( !get_CF() );
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}
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void BX_CPU_C::PUSHF_Fw(bxInstruction_c *i)
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{
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if (v8086_mode() && (BX_CPU_THIS_PTR get_IOPL ()<3)) {
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exception(BX_GP_EXCEPTION, 0, 0);
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return;
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}
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push_16(read_flags());
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}
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#if BX_CPU_LEVEL >= 3
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void BX_CPU_C::PUSHF_Fd(bxInstruction_c *i)
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{
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if (v8086_mode() && (BX_CPU_THIS_PTR get_IOPL ()<3)) {
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exception(BX_GP_EXCEPTION, 0, 0);
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return;
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}
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// VM & RF flags cleared in image stored on the stack
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push_32(read_eflags() & 0x00fcffff);
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}
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#if BX_SUPPORT_X86_64
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void BX_CPU_C::PUSHF_Fq(bxInstruction_c *i)
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{
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// VM & RF flags cleared in image stored on the stack
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push_64(read_eflags() & 0x00fcffff);
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}
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#endif
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#endif // BX_CPU_LEVEL >= 3
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void BX_CPU_C::POPF_Fw(bxInstruction_c *i)
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{
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Bit32u changeMask = 0x004dd5;
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Bit16u flags16;
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if (protected_mode()) {
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pop_16(&flags16);
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if (CPL==0)
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changeMask |= EFlagsIOPLMask;
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if (CPL <= BX_CPU_THIS_PTR get_IOPL())
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changeMask |= EFlagsIFMask;
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}
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else if (v8086_mode()) {
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if (BX_CPU_THIS_PTR get_IOPL() < 3) {
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exception(BX_GP_EXCEPTION, 0, 0);
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return;
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}
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pop_16(&flags16);
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// All non-reserved flags except IOPL can be modified
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changeMask |= EFlagsIFMask;
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}
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else {
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pop_16(&flags16);
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// All non-reserved flags can be modified
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changeMask |= (EFlagsIOPLMask | EFlagsIFMask);
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}
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writeEFlags((Bit32u) flags16, changeMask);
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}
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#if BX_CPU_LEVEL >= 3
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void BX_CPU_C::POPF_Fd(bxInstruction_c *i)
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{
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Bit32u changeMask = 0x244dd5; // AC, ID
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Bit32u flags32;
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if (protected_mode()) {
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pop_32(&flags32);
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if (CPL==0)
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changeMask |= EFlagsIOPLMask;
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if (CPL <= BX_CPU_THIS_PTR get_IOPL())
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changeMask |= EFlagsIFMask;
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// All non-reserved flags except VIP/VIF and VM can be modified
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// VIP/VIF are cleared, VM is unaffected
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changeMask |= (EFlagsRFMask | EFlagsVIPMask | EFlagsVIFMask);
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flags32 &= ~(EFlagsVIFMask | EFlagsVIPMask); // Clear VIP/VIF
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}
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else if (v8086_mode()) {
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if (BX_CPU_THIS_PTR get_IOPL() < 3) {
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exception(BX_GP_EXCEPTION, 0, 0);
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return;
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}
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pop_32(&flags32);
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// v8086-mode: VM,RF,IOPL,VIP,VIF are unaffected.
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changeMask |= EFlagsIFMask;
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}
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else { // Real-mode
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pop_32(&flags32);
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// All non-reserved flags except VIP/VIF and VM can be modified
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// VIP/VIF are cleared, VM is unaffected
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changeMask |= (EFlagsIOPLMask | EFlagsIFMask | EFlagsRFMask |
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EFlagsVIPMask | EFlagsVIFMask);
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flags32 &= ~(EFlagsVIPMask | EFlagsVIFMask); // Clear VIP/VIF
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}
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writeEFlags(flags32, changeMask);
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}
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#if BX_SUPPORT_X86_64
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void BX_CPU_C::POPF_Fq(bxInstruction_c *i)
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{
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Bit32u changeMask = 0x3d4dd5; // AC, ID, RF, VIP/VIF
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Bit64u flags64;
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BX_ASSERT (protected_mode());
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pop_64(&flags64);
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Bit32u flags32 = flags64 & 0xffffffff;
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if (CPL==0)
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changeMask |= EFlagsIOPLMask;
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if (CPL <= BX_CPU_THIS_PTR get_IOPL())
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changeMask |= EFlagsIFMask;
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// All non-reserved flags except VIP/VIF and VM can be modified
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// VIP/VIF are cleared, VM is unaffected
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flags32 &= ~(EFlagsVIPMask | EFlagsVIFMask); // Clear VIP/VIF
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writeEFlags(flags32, changeMask);
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}
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#endif
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#endif // BX_CPU_LEVEL >= 3
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void BX_CPU_C::SALC(bxInstruction_c *i)
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{
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if ( get_CF() ) {
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AL = 0xff;
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}
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else {
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AL = 0x00;
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}
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}
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