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Bochs/bochs/cpu/ctrl_xfer16.cc

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- add RCS Id to header of every file. This makes it easier to know what's going on when someone sends in a modified file.
2001-10-03 17:10:38 +04:00
/////////////////////////////////////////////////////////////////////////
// $Id: ctrl_xfer16.cc,v 1.6 2001-10-03 13:10:37 bdenney Exp $
/////////////////////////////////////////////////////////////////////////
//
- update copyright dates to 2001 for all mandrake headers - for bochs files with other header, replaced with current mandrake header
2001-04-10 06:20:02 +04:00
// Copyright (C) 2001 MandrakeSoft S.A.
- entered original Bochs snapshot bochs-2000_0325a.tar.gz from ftp.bochs.com
2001-04-10 05:04:59 +04:00
//
// 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
- parts of the SMP merge apparantly broke the debugger and this revision tries to fix it. The shortcuts to register names such as AX and DL are #defines in cpu/cpu.h, and they are defined in terms of BX_CPU_THIS_PTR. When BX_USE_CPU_SMF=1, this works fine. (This is what bochs used for a long time, and nobody used the SMF=0 mode at all.) To make SMP bochs work, I had to get SMF=0 mode working for the CPU so that there could be an array of cpus. When SMF=0 for the CPU, BX_CPU_THIS_PTR is defined to be "this->" which only works within methods of BX_CPU_C. Code outside of BX_CPU_C must reference BX_CPU(num) instead. - to try to enforce the correct use of AL/AX/DL/etc. shortcuts, they are now only #defined when "NEED_CPU_REG_SHORTCUTS" is #defined. This is only done in the cpu/*.cc code.
2001-05-24 22:46:34 +04:00
#define NEED_CPU_REG_SHORTCUTS 1
- entered original Bochs snapshot bochs-2000_0325a.tar.gz from ftp.bochs.com
2001-04-10 05:04:59 +04:00
#include "bochs.h"
merge in BRANCH-io-cleanup. To see the commit logs for this use either cvsweb or cvs update -r BRANCH-io-cleanup and then 'cvs log' the various files. In general this provides a generic interface for logging. logfunctions:: is a class that is inherited by some classes, and also . allocated as a standalone global called 'genlog'. All logging uses . one of the ::info(), ::error(), ::ldebug(), ::panic() methods of this . class through 'BX_INFO(), BX_ERROR(), BX_DEBUG(), BX_PANIC()' macros . respectively. . . An example usage: . BX_INFO(("Hello, World!\n")); iofunctions:: is a class that is allocated once by default, and assigned as the iofunction of each logfunctions instance. It is this class that maintains the file descriptor and other output related code, at this point using vfprintf(). At some future point, someone may choose to write a gui 'console' for bochs to which messages would be redirected simply by assigning a different iofunction class to the various logfunctions objects. More cleanup is coming, but this works for now. If you want to see alot of debugging output, in main.cc, change onoff[LOGLEV_DEBUG]=0 to =1. Comments, bugs, flames, to me: todd@fries.net
2001-05-15 18:49:57 +04:00
#define LOG_THIS BX_CPU_THIS_PTR
- entered original Bochs snapshot bochs-2000_0325a.tar.gz from ftp.bochs.com
2001-04-10 05:04:59 +04:00
void
BX_CPU_C::RETnear16_Iw(BxInstruction_t *i)
{
Bit16u imm16;
Bit32u temp_ESP;
Bit16u return_IP;
#if BX_DEBUGGER
BX_CPU_THIS_PTR show_flag |= Flag_ret;
#endif
if (BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.d_b) /* 32bit stack */
temp_ESP = ESP;
else
temp_ESP = SP;
imm16 = i->Iw;
invalidate_prefetch_q();
if (protected_mode()) {
if ( !can_pop(2) ) {
strip '\n' from BX_{INFO,DEBUG,ERROR,PANIC} don't need it, moved the output of it into the general io functions. saves space, as well as removes the confusing output if a '\n' is left off
2001-05-30 22:56:02 +04:00
BX_PANIC(("retnear_iw: can't pop IP"));
- entered original Bochs snapshot bochs-2000_0325a.tar.gz from ftp.bochs.com
2001-04-10 05:04:59 +04:00
/* ??? #SS(0) -or #GP(0) */
}
access_linear(BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.base + temp_ESP + 0,
2, CPL==3, BX_READ, &return_IP);
if ( return_IP > BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.limit_scaled ) {
strip '\n' from BX_{INFO,DEBUG,ERROR,PANIC} don't need it, moved the output of it into the general io functions. saves space, as well as removes the confusing output if a '\n' is left off
2001-05-30 22:56:02 +04:00
BX_PANIC(("retnear_iw: IP > limit"));
- entered original Bochs snapshot bochs-2000_0325a.tar.gz from ftp.bochs.com
2001-04-10 05:04:59 +04:00
}
if ( !can_pop(2 + imm16) ) {
strip '\n' from BX_{INFO,DEBUG,ERROR,PANIC} don't need it, moved the output of it into the general io functions. saves space, as well as removes the confusing output if a '\n' is left off
2001-05-30 22:56:02 +04:00
BX_PANIC(("retnear_iw: can't release bytes from stack"));
- entered original Bochs snapshot bochs-2000_0325a.tar.gz from ftp.bochs.com
2001-04-10 05:04:59 +04:00
/* #GP(0) -or #SS(0) ??? */
}
BX_CPU_THIS_PTR eip = return_IP;
if (BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.d_b) /* 32bit stack */
ESP += 2 + imm16; /* ??? should it be 2*imm16 ? */
else
SP += 2 + imm16;
}
else {
pop_16(&return_IP);
BX_CPU_THIS_PTR eip = return_IP;
if (BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.d_b) /* 32bit stack */
ESP += imm16; /* ??? should it be 2*imm16 ? */
else
SP += imm16;
}
BX_INSTR_UCNEAR_BRANCH(BX_INSTR_IS_RET, BX_CPU_THIS_PTR eip);
}
void
BX_CPU_C::RETnear16(BxInstruction_t *i)
{
Bit32u temp_ESP;
Bit16u return_IP;
#if BX_DEBUGGER
BX_CPU_THIS_PTR show_flag |= Flag_ret;
#endif
invalidate_prefetch_q();
if (BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.d_b) /* 32bit stack */
temp_ESP = ESP;
else
temp_ESP = SP;
if (protected_mode()) {
if ( !can_pop(2) ) {
strip '\n' from BX_{INFO,DEBUG,ERROR,PANIC} don't need it, moved the output of it into the general io functions. saves space, as well as removes the confusing output if a '\n' is left off
2001-05-30 22:56:02 +04:00
BX_PANIC(("retnear: can't pop IP"));
- entered original Bochs snapshot bochs-2000_0325a.tar.gz from ftp.bochs.com
2001-04-10 05:04:59 +04:00
/* ??? #SS(0) -or #GP(0) */
}
access_linear(BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.base + temp_ESP + 0,
2, CPL==3, BX_READ, &return_IP);
if ( return_IP > BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.limit_scaled ) {
strip '\n' from BX_{INFO,DEBUG,ERROR,PANIC} don't need it, moved the output of it into the general io functions. saves space, as well as removes the confusing output if a '\n' is left off
2001-05-30 22:56:02 +04:00
BX_PANIC(("retnear: IP > limit"));
- entered original Bochs snapshot bochs-2000_0325a.tar.gz from ftp.bochs.com
2001-04-10 05:04:59 +04:00
}
BX_CPU_THIS_PTR eip = return_IP;
if (BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.d_b) /* 32bit stack */
ESP += 2;
else
SP += 2;
}
else {
pop_16(&return_IP);
BX_CPU_THIS_PTR eip = return_IP;
}
BX_INSTR_UCNEAR_BRANCH(BX_INSTR_IS_RET, BX_CPU_THIS_PTR eip);
}
void
BX_CPU_C::RETfar16_Iw(BxInstruction_t *i)
{
Bit16s imm16;
Bit16u ip, cs_raw;
#if BX_DEBUGGER
BX_CPU_THIS_PTR show_flag |= Flag_ret;
#endif
/* ??? is imm16, number of bytes/words depending on operandsize ? */
imm16 = i->Iw;
invalidate_prefetch_q();
#if BX_CPU_LEVEL >= 2
if (protected_mode()) {
BX_CPU_THIS_PTR return_protected(i, imm16);
goto done;
}
#endif
pop_16(&ip);
pop_16(&cs_raw);
BX_CPU_THIS_PTR eip = (Bit32u) ip;
load_seg_reg(&BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS], cs_raw);
if (BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.d_b)
ESP += imm16;
else
SP += imm16;
done:
BX_INSTR_FAR_BRANCH(BX_INSTR_IS_RET,
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].selector.value, BX_CPU_THIS_PTR eip);
return;
}
void
BX_CPU_C::RETfar16(BxInstruction_t *i)
{
Bit16u ip, cs_raw;
#if BX_DEBUGGER
BX_CPU_THIS_PTR show_flag |= Flag_ret;
#endif
invalidate_prefetch_q();
#if BX_CPU_LEVEL >= 2
if ( protected_mode() ) {
BX_CPU_THIS_PTR return_protected(i, 0);
goto done;
}
#endif
pop_16(&ip);
pop_16(&cs_raw);
BX_CPU_THIS_PTR eip = (Bit32u) ip;
load_seg_reg(&BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS], cs_raw);
done:
BX_INSTR_FAR_BRANCH(BX_INSTR_IS_RET,
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].selector.value, BX_CPU_THIS_PTR eip);
return;
}
void
BX_CPU_C::CALL_Aw(BxInstruction_t *i)
{
Bit32u new_EIP;
#if BX_DEBUGGER
BX_CPU_THIS_PTR show_flag |= Flag_call;
#endif
invalidate_prefetch_q();
new_EIP = EIP + (Bit32s) i->Id;
new_EIP &= 0x0000ffff;
#if BX_CPU_LEVEL >= 2
if ( protected_mode() &&
(new_EIP > BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.limit_scaled) ) {
strip '\n' from BX_{INFO,DEBUG,ERROR,PANIC} don't need it, moved the output of it into the general io functions. saves space, as well as removes the confusing output if a '\n' is left off
2001-05-30 22:56:02 +04:00
BX_PANIC(("call_av: new_IP > BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].limit"));
- entered original Bochs snapshot bochs-2000_0325a.tar.gz from ftp.bochs.com
2001-04-10 05:04:59 +04:00
exception(BX_GP_EXCEPTION, 0, 0);
}
#endif
/* push 16 bit EA of next instruction */
push_16(IP);
BX_CPU_THIS_PTR eip = new_EIP;
BX_INSTR_UCNEAR_BRANCH(BX_INSTR_IS_CALL, BX_CPU_THIS_PTR eip);
}
void
BX_CPU_C::CALL16_Ap(BxInstruction_t *i)
{
Bit16u cs_raw;
Bit16u disp16;
#if BX_DEBUGGER
BX_CPU_THIS_PTR show_flag |= Flag_call;
#endif
disp16 = i->Iw;
cs_raw = i->Iw2;
invalidate_prefetch_q();
#if BX_CPU_LEVEL >= 2
if (protected_mode()) {
BX_CPU_THIS_PTR call_protected(i, cs_raw, disp16);
goto done;
}
#endif
push_16(BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].selector.value);
push_16((Bit16u) BX_CPU_THIS_PTR eip);
BX_CPU_THIS_PTR eip = (Bit32u) disp16;
load_seg_reg(&BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS], cs_raw);
done:
BX_INSTR_FAR_BRANCH(BX_INSTR_IS_CALL,
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].selector.value, BX_CPU_THIS_PTR eip);
return;
}
void
BX_CPU_C::CALL_Ew(BxInstruction_t *i)
{
Bit32u temp_ESP;
Bit16u op1_16;
#if BX_DEBUGGER
BX_CPU_THIS_PTR show_flag |= Flag_call;
#endif
if (BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.d_b)
temp_ESP = ESP;
else
temp_ESP = SP;
/* 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);
}
invalidate_prefetch_q();
#if BX_CPU_LEVEL >= 2
if (protected_mode()) {
if (op1_16 > BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.limit_scaled) {
strip '\n' from BX_{INFO,DEBUG,ERROR,PANIC} don't need it, moved the output of it into the general io functions. saves space, as well as removes the confusing output if a '\n' is left off
2001-05-30 22:56:02 +04:00
BX_PANIC(("call_ev: IP out of CS limits!"));
- entered original Bochs snapshot bochs-2000_0325a.tar.gz from ftp.bochs.com
2001-04-10 05:04:59 +04:00
exception(BX_GP_EXCEPTION, 0, 0);
}
if ( !can_push(&BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache, temp_ESP, 2) ) {
strip '\n' from BX_{INFO,DEBUG,ERROR,PANIC} don't need it, moved the output of it into the general io functions. saves space, as well as removes the confusing output if a '\n' is left off
2001-05-30 22:56:02 +04:00
BX_PANIC(("call_ev: can't push IP"));
- entered original Bochs snapshot bochs-2000_0325a.tar.gz from ftp.bochs.com
2001-04-10 05:04:59 +04:00
}
}
#endif
push_16(IP);
BX_CPU_THIS_PTR eip = op1_16;
BX_INSTR_UCNEAR_BRANCH(BX_INSTR_IS_CALL, BX_CPU_THIS_PTR eip);
}
void
BX_CPU_C::CALL16_Ep(BxInstruction_t *i)
{
Bit16u cs_raw;
Bit16u op1_16;
#if BX_DEBUGGER
BX_CPU_THIS_PTR show_flag |= Flag_call;
#endif
/* op1_16 is a register or memory reference */
if (i->mod == 0xc0) {
merge in BRANCH-io-cleanup. To see the commit logs for this use either cvsweb or cvs update -r BRANCH-io-cleanup and then 'cvs log' the various files. In general this provides a generic interface for logging. logfunctions:: is a class that is inherited by some classes, and also . allocated as a standalone global called 'genlog'. All logging uses . one of the ::info(), ::error(), ::ldebug(), ::panic() methods of this . class through 'BX_INFO(), BX_ERROR(), BX_DEBUG(), BX_PANIC()' macros . respectively. . . An example usage: . BX_INFO(("Hello, World!\n")); iofunctions:: is a class that is allocated once by default, and assigned as the iofunction of each logfunctions instance. It is this class that maintains the file descriptor and other output related code, at this point using vfprintf(). At some future point, someone may choose to write a gui 'console' for bochs to which messages would be redirected simply by assigning a different iofunction class to the various logfunctions objects. More cleanup is coming, but this works for now. If you want to see alot of debugging output, in main.cc, change onoff[LOGLEV_DEBUG]=0 to =1. Comments, bugs, flames, to me: todd@fries.net
2001-05-15 18:49:57 +04:00
BX_PANIC(("CALL_Ep: op1 is a register"));
- entered original Bochs snapshot bochs-2000_0325a.tar.gz from ftp.bochs.com
2001-04-10 05:04:59 +04:00
}
/* pointer, segment address pair */
read_virtual_word(i->seg, i->rm_addr, &op1_16);
read_virtual_word(i->seg, i->rm_addr+2, &cs_raw);
invalidate_prefetch_q();
if ( protected_mode() ) {
BX_CPU_THIS_PTR call_protected(i, cs_raw, op1_16);
goto done;
}
push_16(BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].selector.value);
push_16(IP);
BX_CPU_THIS_PTR eip = op1_16;
load_seg_reg(&BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS], cs_raw);
done:
BX_INSTR_FAR_BRANCH(BX_INSTR_IS_CALL,
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].selector.value, BX_CPU_THIS_PTR eip);
return;
}
void
BX_CPU_C::JMP_Jw(BxInstruction_t *i)
{
Bit32u new_EIP;
invalidate_prefetch_q();
new_EIP = EIP + (Bit32s) i->Id;
new_EIP &= 0x0000ffff;
#if BX_CPU_LEVEL >= 2
if (protected_mode()) {
if ( new_EIP > BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.limit_scaled ) {
strip '\n' from BX_{INFO,DEBUG,ERROR,PANIC} don't need it, moved the output of it into the general io functions. saves space, as well as removes the confusing output if a '\n' is left off
2001-05-30 22:56:02 +04:00
BX_PANIC(("jmp_jv: offset outside of CS limits"));
- entered original Bochs snapshot bochs-2000_0325a.tar.gz from ftp.bochs.com
2001-04-10 05:04:59 +04:00
exception(BX_GP_EXCEPTION, 0, 0);
}
}
#endif
BX_CPU_THIS_PTR eip = new_EIP;
BX_INSTR_UCNEAR_BRANCH(BX_INSTR_IS_JMP, new_EIP);
}
void
BX_CPU_C::JCC_Jw(BxInstruction_t *i)
{
Boolean condition = 0;
switch (i->b1 & 0x0f) {
case 0x00: /* JO */ condition = get_OF(); break;
case 0x01: /* JNO */ condition = !get_OF(); break;
case 0x02: /* JB */ condition = get_CF(); break;
case 0x03: /* JNB */ condition = !get_CF(); break;
case 0x04: /* JZ */ condition = get_ZF(); break;
case 0x05: /* JNZ */ condition = !get_ZF(); break;
case 0x06: /* JBE */ condition = get_CF() || get_ZF(); break;
case 0x07: /* JNBE */ condition = !get_CF() && !get_ZF(); break;
case 0x08: /* JS */ condition = get_SF(); break;
case 0x09: /* JNS */ condition = !get_SF(); break;
case 0x0A: /* JP */ condition = get_PF(); break;
case 0x0B: /* JNP */ condition = !get_PF(); break;
case 0x0C: /* JL */ condition = get_SF() != get_OF(); break;
case 0x0D: /* JNL */ condition = get_SF() == get_OF(); break;
case 0x0E: /* JLE */ condition = get_ZF() || (get_SF() != get_OF());
break;
case 0x0F: /* JNLE */ condition = (get_SF() == get_OF()) &&
!get_ZF();
break;
}
if (condition) {
Bit32u new_EIP;
new_EIP = EIP + (Bit32s) i->Id;
new_EIP &= 0x0000ffff;
#if BX_CPU_LEVEL >= 2
if (protected_mode()) {
if ( new_EIP > BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.limit_scaled ) {
strip '\n' from BX_{INFO,DEBUG,ERROR,PANIC} don't need it, moved the output of it into the general io functions. saves space, as well as removes the confusing output if a '\n' is left off
2001-05-30 22:56:02 +04:00
BX_PANIC(("jo_routine: offset outside of CS limits"));
- entered original Bochs snapshot bochs-2000_0325a.tar.gz from ftp.bochs.com
2001-04-10 05:04:59 +04:00
exception(BX_GP_EXCEPTION, 0, 0);
}
}
#endif
EIP = new_EIP;
BX_INSTR_CNEAR_BRANCH_TAKEN(new_EIP);
revalidate_prefetch_q();
}
#if BX_INSTRUMENTATION
else {
BX_INSTR_CNEAR_BRANCH_NOT_TAKEN();
}
#endif
}
void
BX_CPU_C::JMP_Ew(BxInstruction_t *i)
{
Bit32u new_EIP;
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);
}
invalidate_prefetch_q();
new_EIP = op1_16;
#if BX_CPU_LEVEL >= 2
if (protected_mode()) {
if (new_EIP > BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.limit_scaled) {
strip '\n' from BX_{INFO,DEBUG,ERROR,PANIC} don't need it, moved the output of it into the general io functions. saves space, as well as removes the confusing output if a '\n' is left off
2001-05-30 22:56:02 +04:00
BX_PANIC(("jmp_ev: IP out of CS limits!"));
- entered original Bochs snapshot bochs-2000_0325a.tar.gz from ftp.bochs.com
2001-04-10 05:04:59 +04:00
exception(BX_GP_EXCEPTION, 0, 0);
}
}
#endif
BX_CPU_THIS_PTR eip = new_EIP;
BX_INSTR_UCNEAR_BRANCH(BX_INSTR_IS_JMP, new_EIP);
}
/* Far indirect jump */
void
BX_CPU_C::JMP16_Ep(BxInstruction_t *i)
{
Bit16u cs_raw;
Bit16u op1_16;
/* op1_16 is a register or memory reference */
if (i->mod == 0xc0) {
/* far indirect must specify a memory address */
strip '\n' from BX_{INFO,DEBUG,ERROR,PANIC} don't need it, moved the output of it into the general io functions. saves space, as well as removes the confusing output if a '\n' is left off
2001-05-30 22:56:02 +04:00
BX_PANIC(("JMP_Ep(): op1 is a register"));
- entered original Bochs snapshot bochs-2000_0325a.tar.gz from ftp.bochs.com
2001-04-10 05:04:59 +04:00
}
/* pointer, segment address pair */
read_virtual_word(i->seg, i->rm_addr, &op1_16);
read_virtual_word(i->seg, i->rm_addr+2, &cs_raw);
invalidate_prefetch_q();
#if BX_CPU_LEVEL >= 2
if ( protected_mode() ) {
BX_CPU_THIS_PTR jump_protected(i, cs_raw, op1_16);
goto done;
}
#endif
BX_CPU_THIS_PTR eip = op1_16;
load_seg_reg(&BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS], cs_raw);
done:
BX_INSTR_FAR_BRANCH(BX_INSTR_IS_JMP,
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].selector.value, BX_CPU_THIS_PTR eip);
return;
}
void
BX_CPU_C::IRET16(BxInstruction_t *i)
{
Bit16u ip, cs_raw, flags;
#if BX_DEBUGGER
BX_CPU_THIS_PTR show_flag |= Flag_iret;
BX_CPU_THIS_PTR show_eip = BX_CPU_THIS_PTR eip;
#endif
invalidate_prefetch_q();
if (v8086_mode()) {
// IOPL check in stack_return_from_v86()
stack_return_from_v86(i);
goto done;
}
#if BX_CPU_LEVEL >= 2
if (BX_CPU_THIS_PTR cr0.pe) {
iret_protected(i);
goto done;
}
#endif
pop_16(&ip);
pop_16(&cs_raw);
pop_16(&flags);
load_seg_reg(&BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS], cs_raw);
BX_CPU_THIS_PTR eip = (Bit32u) ip;
write_flags(flags, /* change IOPL? */ 1, /* change IF? */ 1);
done:
BX_INSTR_FAR_BRANCH(BX_INSTR_IS_IRET,
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].selector.value, BX_CPU_THIS_PTR eip);
return;
}
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