294 lines
7.5 KiB
C++
294 lines
7.5 KiB
C++
/////////////////////////////////////////////////////////////////////////
|
|
// $Id: stack_pro.cc,v 1.38 2007-12-20 20:58:37 sshwarts 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"
|
|
#include "cpu.h"
|
|
#define LOG_THIS BX_CPU_THIS_PTR
|
|
|
|
|
|
void BX_CPU_C::push_16(Bit16u value16)
|
|
{
|
|
/* must use StackAddrSize, and either RSP, ESP or SP accordingly */
|
|
#if BX_SUPPORT_X86_64
|
|
if (StackAddrSize64())
|
|
{
|
|
write_virtual_word(BX_SEG_REG_SS, RSP-2, value16);
|
|
RSP -= 2;
|
|
}
|
|
else
|
|
#endif
|
|
if (BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.d_b) { /* StackAddrSize = 32 */
|
|
write_virtual_word(BX_SEG_REG_SS, (Bit32u) (ESP-2), value16);
|
|
ESP -= 2;
|
|
}
|
|
else
|
|
{
|
|
write_virtual_word(BX_SEG_REG_SS, (Bit16u) (SP-2), value16);
|
|
SP -= 2;
|
|
}
|
|
}
|
|
|
|
/* push 32 bit operand */
|
|
void BX_CPU_C::push_32(Bit32u value32)
|
|
{
|
|
/* must use StackAddrSize, and either RSP, ESP or SP accordingly */
|
|
#if BX_SUPPORT_X86_64
|
|
if (StackAddrSize64())
|
|
{
|
|
write_virtual_dword(BX_SEG_REG_SS, RSP-4, value32);
|
|
RSP -= 4;
|
|
}
|
|
else
|
|
#endif
|
|
if (BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.d_b) { /* StackAddrSize = 32 */
|
|
write_virtual_dword(BX_SEG_REG_SS, (Bit32u) (ESP-4), value32);
|
|
ESP -= 4;
|
|
}
|
|
else
|
|
{
|
|
write_virtual_dword(BX_SEG_REG_SS, (Bit16u) (SP-4), value32);
|
|
SP -= 4;
|
|
}
|
|
}
|
|
|
|
/* push 64 bit operand */
|
|
#if BX_SUPPORT_X86_64
|
|
void BX_CPU_C::push_64(Bit64u value64)
|
|
{
|
|
BX_ASSERT(StackAddrSize64());
|
|
|
|
write_virtual_qword(BX_SEG_REG_SS, RSP-8, value64);
|
|
RSP -= 8;
|
|
}
|
|
#endif
|
|
|
|
/* pop 16 bit operand from the stack */
|
|
Bit16u BX_CPU_C::pop_16(void)
|
|
{
|
|
Bit16u value16;
|
|
|
|
#if BX_SUPPORT_X86_64
|
|
if (StackAddrSize64()) {
|
|
value16 = read_virtual_word(BX_SEG_REG_SS, RSP);
|
|
RSP += 2;
|
|
}
|
|
else
|
|
#endif
|
|
if (BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.d_b) {
|
|
value16 = read_virtual_word(BX_SEG_REG_SS, ESP);
|
|
ESP += 2;
|
|
}
|
|
else {
|
|
value16 = read_virtual_word(BX_SEG_REG_SS, SP);
|
|
SP += 2;
|
|
}
|
|
|
|
return value16;
|
|
}
|
|
|
|
/* pop 32 bit operand from the stack */
|
|
Bit32u BX_CPU_C::pop_32()
|
|
{
|
|
Bit32u value32;
|
|
|
|
#if BX_SUPPORT_X86_64
|
|
if (StackAddrSize64()) {
|
|
value32 = read_virtual_dword(BX_SEG_REG_SS, RSP);
|
|
RSP += 4;
|
|
}
|
|
else
|
|
#endif
|
|
if (BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.d_b) {
|
|
value32 = read_virtual_dword(BX_SEG_REG_SS, ESP);
|
|
ESP += 4;
|
|
}
|
|
else {
|
|
value32 = read_virtual_dword(BX_SEG_REG_SS, SP);
|
|
SP += 4;
|
|
}
|
|
|
|
return value32;
|
|
}
|
|
|
|
/* pop 64 bit operand from the stack */
|
|
#if BX_SUPPORT_X86_64
|
|
Bit64u BX_CPU_C::pop_64()
|
|
{
|
|
BX_ASSERT(StackAddrSize64());
|
|
|
|
Bit64u value64 = read_virtual_qword(BX_SEG_REG_SS, RSP);
|
|
RSP += 8;
|
|
|
|
return value64;
|
|
}
|
|
#endif
|
|
|
|
bx_bool BX_CPP_AttrRegparmN(3)
|
|
BX_CPU_C::can_push(bx_descriptor_t *descriptor, Bit32u esp, Bit32u bytes)
|
|
{
|
|
#if BX_SUPPORT_X86_64
|
|
if (BX_CPU_THIS_PTR cpu_mode == BX_MODE_LONG_64) {
|
|
return(1);
|
|
}
|
|
#endif
|
|
|
|
// small stack compares against 16-bit SP
|
|
if (!descriptor->u.segment.d_b)
|
|
esp &= 0x0000ffff;
|
|
|
|
if (descriptor->valid==0) {
|
|
BX_ERROR(("can_push(): SS invalidated."));
|
|
return(0);
|
|
}
|
|
|
|
if (descriptor->p==0) {
|
|
BX_ERROR(("can_push(): descriptor not present"));
|
|
return(0);
|
|
}
|
|
|
|
if (IS_DATA_SEGMENT_EXPAND_DOWN(descriptor->type)) /* expand down segment */
|
|
{
|
|
Bit32u expand_down_limit;
|
|
|
|
if (descriptor->u.segment.d_b)
|
|
expand_down_limit = 0xffffffff;
|
|
else
|
|
expand_down_limit = 0x0000ffff;
|
|
|
|
if (esp==0) {
|
|
BX_PANIC(("can_push(): esp=0, wraparound?"));
|
|
return(0);
|
|
}
|
|
|
|
if (esp < bytes) {
|
|
BX_PANIC(("can_push(): expand-down: esp < N"));
|
|
return(0);
|
|
}
|
|
if ((esp - bytes) <= descriptor->u.segment.limit_scaled) {
|
|
BX_ERROR(("can_push(): expand-down: esp-N < limit"));
|
|
return(0);
|
|
}
|
|
if (esp > expand_down_limit) {
|
|
BX_ERROR(("can_push(): esp > expand-down-limit"));
|
|
return(0);
|
|
}
|
|
return(1);
|
|
}
|
|
else { /* normal (expand-up) segment */
|
|
if (descriptor->u.segment.limit_scaled==0) {
|
|
BX_PANIC(("can_push(): found limit of 0"));
|
|
return(0);
|
|
}
|
|
|
|
// Look at case where esp==0. Possibly, it's an intentional wraparound
|
|
// If so, limit must be the maximum for the given stack size
|
|
if (esp==0) {
|
|
if (descriptor->u.segment.d_b && (descriptor->u.segment.limit_scaled==0xffffffff))
|
|
return(1);
|
|
if ((descriptor->u.segment.d_b==0) && (descriptor->u.segment.limit_scaled>=0xffff))
|
|
return(1);
|
|
BX_ERROR(("can_push(): esp=0, normal, wraparound? limit=%08x",
|
|
descriptor->u.segment.limit_scaled));
|
|
return(0);
|
|
}
|
|
|
|
if (!descriptor->u.segment.d_b) {
|
|
// Weird case for 16-bit SP.
|
|
esp = ((esp-bytes) & 0xffff) + bytes;
|
|
}
|
|
if (esp < bytes) {
|
|
BX_ERROR(("can_push(): expand-up: esp < N"));
|
|
return(0);
|
|
}
|
|
if ((esp-1) > descriptor->u.segment.limit_scaled) {
|
|
BX_ERROR(("can_push(): expand-up: SP > limit"));
|
|
return(0);
|
|
}
|
|
/* all checks pass */
|
|
return(1);
|
|
}
|
|
}
|
|
|
|
bx_bool BX_CPU_C::can_pop(Bit32u bytes)
|
|
{
|
|
Bit32u temp_ESP, expand_down_limit;
|
|
|
|
#if BX_SUPPORT_X86_64
|
|
if (BX_CPU_THIS_PTR cpu_mode == BX_MODE_LONG_64) {
|
|
return(1);
|
|
}
|
|
#endif
|
|
|
|
if (BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.d_b) { /* Big bit set: use ESP */
|
|
temp_ESP = ESP;
|
|
expand_down_limit = 0xFFFFFFFF;
|
|
}
|
|
else { /* Big bit clear: use SP */
|
|
temp_ESP = SP;
|
|
expand_down_limit = 0xFFFF;
|
|
}
|
|
|
|
if (BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.valid==0) {
|
|
BX_ERROR(("can_pop(): SS invalidated"));
|
|
return(0); /* never gets here */
|
|
}
|
|
|
|
if (BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.p==0) {
|
|
BX_ERROR(("can_pop(): SS.p = 0"));
|
|
return(0);
|
|
}
|
|
|
|
if (IS_DATA_SEGMENT_EXPAND_DOWN(BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.type)) { /* expand down */
|
|
if (temp_ESP == expand_down_limit) {
|
|
BX_PANIC(("can_pop(): found SP=ffff"));
|
|
return(0);
|
|
}
|
|
if (((expand_down_limit - temp_ESP) + 1) >= bytes)
|
|
return(1);
|
|
return(0);
|
|
}
|
|
else { /* normal (expand-up) segment */
|
|
if (BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.limit_scaled==0) {
|
|
BX_ERROR(("can_pop(): SS.limit = 0"));
|
|
return(0);
|
|
}
|
|
if (temp_ESP == expand_down_limit) {
|
|
BX_ERROR(("can_pop(): found SP=ffff"));
|
|
return(0);
|
|
}
|
|
if (temp_ESP > BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.limit_scaled) {
|
|
BX_ERROR(("can_pop(): eSP > SS.limit"));
|
|
return(0);
|
|
}
|
|
if (((BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.limit_scaled - temp_ESP) + 1) >= bytes)
|
|
return(1);
|
|
return(0);
|
|
}
|
|
}
|