175 lines
3.9 KiB
C++
175 lines
3.9 KiB
C++
/////////////////////////////////////////////////////////////////////////
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// $Id: stack16.cc,v 1.17 2004-11-02 20:39:45 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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void
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BX_CPU_C::PUSH_RX(bxInstruction_c *i)
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{
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push_16( BX_CPU_THIS_PTR gen_reg[i->opcodeReg()].word.rx );
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}
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void
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BX_CPU_C::POP_RX(bxInstruction_c *i)
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{
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Bit16u rx;
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pop_16(&rx);
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BX_CPU_THIS_PTR gen_reg[i->opcodeReg()].word.rx = rx;
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}
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void
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BX_CPU_C::POP_Ew(bxInstruction_c *i)
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{
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Bit16u val16;
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pop_16(&val16);
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if (i->modC0()) {
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BX_WRITE_16BIT_REG(i->rm(), val16);
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}
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else {
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// Note: there is one little weirdism here. When 32bit addressing
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// is used, it is possible to use ESP in the modrm addressing.
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// If used, the value of ESP after the pop is used to calculate
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// the address.
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if (i->as32L() && (!i->modC0()) && (i->rm()==4) && (i->sibBase()==4)) {
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BX_CPU_CALL_METHODR (i->ResolveModrm, (i));
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}
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write_virtual_word(i->seg(), RMAddr(i), &val16);
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}
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}
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void
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BX_CPU_C::PUSHAD16(bxInstruction_c *i)
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{
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#if BX_CPU_LEVEL < 2
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BX_INFO(("PUSHAD: not supported on an 8086"));
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UndefinedOpcode(i);
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#else
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Bit32u temp_ESP;
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Bit16u sp;
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if (BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.d_b)
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temp_ESP = ESP;
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else
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temp_ESP = SP;
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#if BX_CPU_LEVEL >= 2
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if (protected_mode()) {
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if ( !can_push(&BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache, temp_ESP, 16) ) {
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BX_ERROR(("PUSHAD(): stack doesn't have enough room!"));
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exception(BX_SS_EXCEPTION, 0, 0);
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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 (temp_ESP < 16)
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BX_PANIC(("PUSHAD: eSP < 16"));
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}
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sp = SP;
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/* ??? optimize this by using virtual write, all checks passed */
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push_16(AX);
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push_16(CX);
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push_16(DX);
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push_16(BX);
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push_16(sp);
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push_16(BP);
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push_16(SI);
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push_16(DI);
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#endif
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}
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void
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BX_CPU_C::POPAD16(bxInstruction_c *i)
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{
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#if BX_CPU_LEVEL < 2
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BX_INFO(("POPA not supported on an 8086"));
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UndefinedOpcode(i);
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#else /* 286+ */
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Bit16u di, si, bp, tmp, bx, dx, cx, ax;
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if (protected_mode()) {
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if ( !can_pop(16) ) {
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BX_ERROR(("POPA: not enough bytes on stack"));
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exception(BX_SS_EXCEPTION, 0, 0);
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return;
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}
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}
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/* ??? optimize this */
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pop_16(&di);
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pop_16(&si);
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pop_16(&bp);
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pop_16(&tmp); /* value for SP discarded */
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pop_16(&bx);
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pop_16(&dx);
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pop_16(&cx);
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pop_16(&ax);
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DI = di;
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SI = si;
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BP = bp;
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BX = bx;
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DX = dx;
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CX = cx;
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AX = ax;
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#endif
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}
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void
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BX_CPU_C::PUSH_Iw(bxInstruction_c *i)
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{
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push_16(i->Iw());
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}
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void
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BX_CPU_C::PUSH_Ew(bxInstruction_c *i)
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{
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Bit16u op1_16;
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/* op1_16 is a register or memory reference */
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if (i->modC0()) {
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op1_16 = BX_READ_16BIT_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_virtual_word(i->seg(), RMAddr(i), &op1_16);
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}
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push_16(op1_16);
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}
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