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/////////////////////////////////////////////////////////////////////////
// $Id: stack16.cc,v 1.7 2001/10/03 13:10:37 bdenney Exp $
/////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2001 MandrakeSoft S.A.
//
// MandrakeSoft S.A.
// 43, rue d'Aboukir
// 75002 Paris - France
// http://www.linux-mandrake.com/
// http://www.mandrakesoft.com/
//
// 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#define NEED_CPU_REG_SHORTCUTS 1
#include "bochs.h"
#define LOG_THIS BX_CPU_THIS_PTR
void
BX_CPU_C::PUSH_RX(BxInstruction_t *i)
{
push_16( BX_CPU_THIS_PTR gen_reg[i->b1 & 0x07].word.rx );
}
void
BX_CPU_C::POP_RX(BxInstruction_t *i)
{
Bit16u rx;
pop_16(&rx);
BX_CPU_THIS_PTR gen_reg[i->b1 & 0x07].word.rx = rx;
}
void
BX_CPU_C::POP_Ew(BxInstruction_t *i)
{
Bit16u val16;
pop_16(&val16);
if (i->mod == 0xc0) {
BX_WRITE_16BIT_REG(i->rm, val16);
}
else {
// Note: there is one little weirdism here. When 32bit addressing
// is used, it is possible to use ESP in the modrm addressing.
// If used, the value of ESP after the pop is used to calculate
// the address.
if (i->as_32 && (i->mod!=0xc0) && (i->rm==4) && (i->base==4)) {
BX_CPU_CALL_METHOD (i->ResolveModrm, (i));
}
write_virtual_word(i->seg, i->rm_addr, &val16);
}
}
void
BX_CPU_C::PUSHAD16(BxInstruction_t *i)
{
#if BX_CPU_LEVEL < 2
BX_PANIC(("PUSHAD: not supported on an 8086"));
#else
Bit32u temp_ESP;
Bit16u sp;
if (BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.d_b)
temp_ESP = ESP;
else
temp_ESP = SP;
#if BX_CPU_LEVEL >= 2
if (protected_mode()) {
if ( !can_push(&BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache, temp_ESP, 16) ) {
BX_PANIC(("PUSHA(): stack doesn't have enough room!"));
exception(BX_SS_EXCEPTION, 0, 0);
return;
}
}
else
#endif
{
if (temp_ESP < 16)
BX_PANIC(("pushad: eSP < 16"));
}
sp = SP;
/* ??? optimize this by using virtual write, all checks passed */
push_16(AX);
push_16(CX);
push_16(DX);
push_16(BX);
push_16(sp);
push_16(BP);
push_16(SI);
push_16(DI);
#endif
}
void
BX_CPU_C::POPAD16(BxInstruction_t *i)
{
#if BX_CPU_LEVEL < 2
BX_PANIC(("POPAD not supported on an 8086"));
#else /* 286+ */
Bit16u di, si, bp, tmp, bx, dx, cx, ax;
if (protected_mode()) {
if ( !can_pop(16) ) {
BX_PANIC(("pop_a: not enough bytes on stack"));
exception(BX_SS_EXCEPTION, 0, 0);
return;
}
}
/* ??? optimize this */
pop_16(&di);
pop_16(&si);
pop_16(&bp);
pop_16(&tmp); /* value for SP discarded */
pop_16(&bx);
pop_16(&dx);
pop_16(&cx);
pop_16(&ax);
DI = di;
SI = si;
BP = bp;
BX = bx;
DX = dx;
CX = cx;
AX = ax;
#endif
}
void
BX_CPU_C::PUSH_Iw(BxInstruction_t *i)
{
#if BX_CPU_LEVEL < 2
BX_PANIC(("PUSH_Iv: not supported on 8086!"));
#else
Bit16u imm16;
imm16 = i->Iw;
push_16(imm16);
#endif
}
void
BX_CPU_C::PUSH_Ew(BxInstruction_t *i)
{
Bit16u op1_16;
/* op1_16 is a register or memory reference */
if (i->mod == 0xc0) {
op1_16 = BX_READ_16BIT_REG(i->rm);
}
else {
/* pointer, segment address pair */
read_virtual_word(i->seg, i->rm_addr, &op1_16);
}
push_16(op1_16);
}
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