399 lines
10 KiB
C++
399 lines
10 KiB
C++
/////////////////////////////////////////////////////////////////////////
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// $Id: stack_pro.cc,v 1.21 2005-03-19 20:44:01 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 BX_CPP_AttrRegparmN(1)
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BX_CPU_C::push_16(Bit16u value16)
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{
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/* must use StackAddrSize, and either ESP or SP accordingly */
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#if BX_CPU_LEVEL >= 3
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if (BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.d_b) { /* StackAddrSize = 32 */
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/* 32bit stack size: pushes use SS:ESP */
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if (protected_mode()) {
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if (!can_push(&BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache, ESP, 2)) {
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BX_INFO(("push_16(): push outside stack limits"));
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exception(BX_SS_EXCEPTION, 0, 0);
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}
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}
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else
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{ /* real mode */
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if (ESP == 1)
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BX_PANIC(("CPU shutting down due to lack of stack space, ESP==1"));
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}
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write_virtual_word(BX_SEG_REG_SS, ESP-2, &value16);
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ESP -= 2;
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}
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else
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#endif
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{
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/* 16bit stack size: pushes use SS: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, SP, 2)) {
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BX_INFO(("push_16(): push outside stack limits"));
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exception(BX_SS_EXCEPTION, 0, 0);
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}
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}
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else
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#endif
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{ /* real mode */
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if (SP == 1)
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BX_PANIC(("CPU shutting down due to lack of stack space, SP==1"));
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}
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write_virtual_word(BX_SEG_REG_SS, (Bit16u) (SP-2), &value16);
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SP -= 2;
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}
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}
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#if BX_CPU_LEVEL >= 3
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/* push 32 bit operand size */
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void BX_CPU_C::push_32(Bit32u value32)
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{
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/* must use StackAddrSize, and either ESP or SP accordingly */
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if (BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.d_b) { /* StackAddrSize = 32 */
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/* 32bit stack size: pushes use SS:ESP */
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if (protected_mode()) {
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if (!can_push(&BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache, ESP, 4)) {
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BX_INFO(("push_32(): push outside stack limits"));
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exception(BX_SS_EXCEPTION, 0, 0);
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}
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}
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else { /* real mode */
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if ((ESP>=1) && (ESP<=3)) {
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BX_PANIC(("push_32: ESP=%08x", (unsigned) ESP));
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}
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}
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write_virtual_dword(BX_SEG_REG_SS, ESP-4, &value32);
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ESP -= 4;
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}
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else { /* 16bit stack size: pushes use SS:SP */
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if (protected_mode()) {
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if (!can_push(&BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache, SP, 4)) {
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BX_INFO(("push_32(): push outside stack limits"));
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exception(BX_SS_EXCEPTION, 0, 0);
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}
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}
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else { /* real mode */
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if ((SP>=1) && (SP<=3)) {
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BX_PANIC(("push_32: SP=%08x", (unsigned) SP));
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}
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}
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write_virtual_dword(BX_SEG_REG_SS, (Bit16u) (SP-4), &value32);
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SP -= 4;
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}
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}
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#if BX_SUPPORT_X86_64
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void BX_CPU_C::push_64(Bit64u value64)
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{
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/* 64bit stack size: pushes use SS:RSP, assume protected mode */
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#if BX_IGNORE_THIS
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if (!can_push(&BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache, RSP, 8)) {
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BX_INFO(("push_64(): push outside stack limits"));
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exception(BX_SS_EXCEPTION, 0, 0); /* #SS(0) */
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}
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#endif
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write_virtual_qword(BX_SEG_REG_SS, RSP-8, &value64);
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RSP -= 8;
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}
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#endif // #if BX_SUPPORT_X86_64
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#endif /* BX_CPU_LEVEL >= 3 */
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void
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BX_CPU_C::pop_16(Bit16u *value16_ptr)
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{
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Bit32u temp_ESP;
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#if BX_CPU_LEVEL >= 3
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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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#endif
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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_pop(2) ) {
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BX_ERROR(("pop_16(): can't pop from 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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#endif
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/* access within limits */
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read_virtual_word(BX_SEG_REG_SS, temp_ESP, value16_ptr);
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if (BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.d_b)
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ESP += 2;
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else
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SP += 2;
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}
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#if BX_CPU_LEVEL >= 3
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void
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BX_CPU_C::pop_32(Bit32u *value32_ptr)
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{
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Bit32u temp_ESP;
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/* 32 bit stack mode: use SS:ESP */
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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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/* 16 bit stack mode: use SS:SP */
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if (protected_mode()) {
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if ( !can_pop(4) ) {
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BX_ERROR(("pop_32(): can't pop from 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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/* access within limits */
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read_virtual_dword(BX_SEG_REG_SS, temp_ESP, value32_ptr);
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if (BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.d_b==1)
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ESP += 4;
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else
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SP += 4;
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}
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#if BX_SUPPORT_X86_64
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void BX_CPU_C::pop_64(Bit64u *value64_ptr)
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{
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if ( !can_pop(8) ) {
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BX_ERROR(("pop_64(): can't pop from stack"));
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exception(BX_SS_EXCEPTION, 0, 0);
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return;
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}
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/* access within limits */
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read_virtual_qword(BX_SEG_REG_SS, RSP, value64_ptr);
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RSP += 8;
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}
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#endif // #if BX_SUPPORT_X86_64
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#endif
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#if BX_CPU_LEVEL >= 2
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bx_bool BX_CPP_AttrRegparmN(3)
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BX_CPU_C::can_push(bx_descriptor_t *descriptor, Bit32u esp, Bit32u bytes)
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{
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#if BX_SUPPORT_X86_64
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if (BX_CPU_THIS_PTR cpu_mode == BX_MODE_LONG_64) {
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return(1);
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}
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#endif
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// small stack compares against 16-bit SP
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if (!descriptor->u.segment.d_b)
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esp &= 0x0000ffff;
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if (descriptor->valid==0) {
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BX_PANIC(("can_push(): SS invalidated."));
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return(0);
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}
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if (descriptor->p==0) {
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BX_PANIC(("can_push(): descriptor not present"));
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return(0);
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}
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if (descriptor->u.segment.c_ed) { /* expand down segment */
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Bit32u expand_down_limit;
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if (descriptor->u.segment.d_b)
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expand_down_limit = 0xffffffff;
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else
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expand_down_limit = 0x0000ffff;
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if (esp==0) {
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BX_PANIC(("can_push(): esp=0, wraparound?"));
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return(0);
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}
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if (esp < bytes) {
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BX_PANIC(("can_push(): expand-down: esp < N"));
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return(0);
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}
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if ( (esp - bytes) <= descriptor->u.segment.limit_scaled ) {
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BX_PANIC(("can_push(): expand-down: esp-N < limit"));
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return(0);
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}
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if ( esp > expand_down_limit ) {
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BX_PANIC(("can_push(): esp > expand-down-limit"));
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return(0);
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}
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return(1);
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}
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else { /* normal (expand-up) segment */
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if (descriptor->u.segment.limit_scaled==0) {
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BX_PANIC(("can_push(): found limit of 0"));
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return(0);
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}
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// Look at case where esp==0. Possibly, it's an intentional wraparound
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// If so, limit must be the maximum for the given stack size
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if (esp==0) {
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if (descriptor->u.segment.d_b && (descriptor->u.segment.limit_scaled==0xffffffff))
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return(1);
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if ((descriptor->u.segment.d_b==0) && (descriptor->u.segment.limit_scaled>=0xffff))
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return(1);
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BX_INFO(("can_push(): esp=0, normal, wraparound? limit=%08x",
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descriptor->u.segment.limit_scaled));
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return(0);
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}
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if ( !descriptor->u.segment.d_b ) {
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// Weird case for 16-bit SP.
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esp = ((esp-bytes) & 0xffff) + bytes;
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}
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if (esp < bytes) {
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BX_INFO(("can_push(): expand-up: esp < N"));
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return(0);
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}
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if ((esp-1) > descriptor->u.segment.limit_scaled) {
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BX_INFO(("can_push(): expand-up: SP > limit"));
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return(0);
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}
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/* all checks pass */
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return(1);
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}
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}
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#endif
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#if BX_CPU_LEVEL >= 2
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bx_bool
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BX_CPU_C::can_pop(Bit32u bytes)
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{
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Bit32u temp_ESP, expand_down_limit;
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#if BX_SUPPORT_X86_64
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if (BX_CPU_THIS_PTR cpu_mode == BX_MODE_LONG_64) {
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return(1);
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}
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#endif
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if (BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.d_b) { /* Big bit set: use ESP */
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temp_ESP = ESP;
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expand_down_limit = 0xFFFFFFFF;
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}
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else { /* Big bit clear: use SP */
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temp_ESP = SP;
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expand_down_limit = 0xFFFF;
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}
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if (BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.valid==0) {
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BX_PANIC(("can_pop(): SS invalidated."));
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return(0); /* never gets here */
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}
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if (BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.p==0) { /* ??? */
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BX_PANIC(("can_pop(): SS.p = 0"));
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return(0);
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}
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if (BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.c_ed) { /* expand down segment */
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if ( temp_ESP == expand_down_limit ) {
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BX_PANIC(("can_pop(): found SP=ffff"));
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return(0);
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}
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if ( ((expand_down_limit - temp_ESP) + 1) >= bytes )
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return(1);
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return(0);
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}
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else { /* normal (expand-up) segment */
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if (BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.limit_scaled==0) {
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BX_PANIC(("can_pop(): SS.limit = 0"));
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}
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if ( temp_ESP == expand_down_limit ) {
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BX_PANIC(("can_pop(): found SP=ffff"));
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return(0);
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}
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if ( temp_ESP > BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.limit_scaled ) {
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BX_PANIC(("can_pop(): eSP > SS.limit"));
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return(0);
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}
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if ( ((BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.limit_scaled - temp_ESP) + 1) >= bytes )
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return(1);
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return(0);
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}
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}
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#endif
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void
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BX_CPU_C::decrementESPForPush(unsigned nBytes, Bit32u *eSP_ptr)
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{
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Bit32u eSP;
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if (BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.d_b)
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eSP = ESP;
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else
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eSP = SP;
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if (protected_mode()) {
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if (!can_push(&BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache, eSP, nBytes)) {
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BX_INFO(("decrementESPForPush: push outside stack limits"));
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exception(BX_SS_EXCEPTION, 0, 0);
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}
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}
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else { // Real Mode.
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if ( (eSP>=1) && (eSP<nBytes) ) {
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BX_PANIC(("decrementESPForPush: eSP=%08x", (unsigned) eSP));
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}
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}
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// And finally, decrement eSP and return the new eSP value.
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eSP -= nBytes;
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if (BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.d_b) {
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ESP = eSP;
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*eSP_ptr = eSP;
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}
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else {
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SP = (Bit16u) eSP;
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*eSP_ptr = SP;
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}
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}
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