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Bochs/bochs/cpu/crregs.cc
Stanislav Shwartsman 6e79fdfb1e optimize data hw breakpoint
2011-04-09 05:12:28 +00:00

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/////////////////////////////////////////////////////////////////////////
// $Id$
/////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2010-2011 Stanislav Shwartsman
// Written by Stanislav Shwartsman [sshwarts at sourceforge net]
//
// 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., 51 Franklin St, Fifth Floor, Boston, MA B 02110-1301 USA
//
/////////////////////////////////////////////////////////////////////////
#define NEED_CPU_REG_SHORTCUTS 1
#include "bochs.h"
#include "cpu.h"
#define LOG_THIS BX_CPU_THIS_PTR
void BX_CPP_AttrRegparmN(1) BX_CPU_C::MOV_DdRd(bxInstruction_c *i)
{
#if BX_SUPPORT_VMX
VMexit_DR_Access(i, 0 /* write */);
#endif
#if BX_CPU_LEVEL >= 4
if (BX_CPU_THIS_PTR cr4.get_DE()) {
if ((i->nnn() & 0xE) == 4) {
BX_ERROR(("MOV_DdRd: access to DR4/DR5 causes #UD"));
exception(BX_UD_EXCEPTION, 0);
}
}
#endif
// Note: processor clears GD upon entering debug exception
// handler, to allow access to the debug registers
if (BX_CPU_THIS_PTR dr7.get_GD()) {
BX_ERROR(("MOV_DdRd: DR7 GD bit is set"));
BX_CPU_THIS_PTR debug_trap |= BX_DEBUG_DR_ACCESS_BIT;
exception(BX_DB_EXCEPTION, 0);
}
if (!real_mode() && CPL!=0) {
BX_ERROR(("MOV_DdRd: CPL!=0 not in real mode"));
exception(BX_GP_EXCEPTION, 0);
}
invalidate_prefetch_q();
/* This instruction is always treated as a register-to-register,
* regardless of the encoding of the MOD field in the MODRM byte.
*/
if (!i->modC0())
BX_PANIC(("MOV_DdRd(): rm field not a register!"));
Bit32u val_32 = BX_READ_32BIT_REG(i->rm());
switch (i->nnn()) {
case 0: // DR0
case 1: // DR1
case 2: // DR2
case 3: // DR3
TLB_invlpg(val_32);
BX_CPU_THIS_PTR dr[i->nnn()] = val_32;
break;
case 4: // DR4
// DR4 aliased to DR6 by default. With Debug Extensions on,
// access to DR4 causes #UD
case 6: // DR6
#if BX_CPU_LEVEL <= 4
// On 386/486 bit12 is settable
BX_CPU_THIS_PTR dr6.val32 = (BX_CPU_THIS_PTR dr6.val32 & 0xffff0ff0) |
(val_32 & 0x0000f00f);
#else
// On Pentium+, bit12 is always zero
BX_CPU_THIS_PTR dr6.val32 = (BX_CPU_THIS_PTR dr6.val32 & 0xffff0ff0) |
(val_32 & 0x0000e00f);
#endif
break;
case 5: // DR5
// DR5 aliased to DR7 by default. With Debug Extensions on,
// access to DR5 causes #UD
case 7: // DR7
// Note: 486+ ignore GE and LE flags. On the 386, exact
// data breakpoint matching does not occur unless it is enabled
// by setting the LE and/or GE flags.
#if BX_CPU_LEVEL <= 4
// 386/486: you can play with all the bits except b10 is always 1
BX_CPU_THIS_PTR dr7.set32(val_32 | 0x00000400);
#else
// Pentium+: bits15,14,12 are hardwired to 0, rest are settable.
// Even bits 11,10 are changeable though reserved.
BX_CPU_THIS_PTR dr7.set32((val_32 & 0xffff2fff) | 0x00000400);
#endif
#if BX_X86_DEBUGGER
// Some sanity checks...
if ((BX_CPU_THIS_PTR dr7.get_R_W0() == BX_HWDebugInstruction && BX_CPU_THIS_PTR dr7.get_LEN0()) ||
(BX_CPU_THIS_PTR dr7.get_R_W1() == BX_HWDebugInstruction && BX_CPU_THIS_PTR dr7.get_LEN1()) ||
(BX_CPU_THIS_PTR dr7.get_R_W2() == BX_HWDebugInstruction && BX_CPU_THIS_PTR dr7.get_LEN2()) ||
(BX_CPU_THIS_PTR dr7.get_R_W3() == BX_HWDebugInstruction && BX_CPU_THIS_PTR dr7.get_LEN3()))
{
// Instruction breakpoint with LENx not 00b (1-byte length)
BX_ERROR(("MOV_DdRd: write of %08x, R/W=00b LEN!=00b", val_32));
}
// if we have code breakpoints enabled then we must check
// breakpoints condition in cpu loop
if (BX_CPU_THIS_PTR dr7.get_bp_enabled()) {
if (BX_CPU_THIS_PTR dr7.get_R_W0() == 0 ||
BX_CPU_THIS_PTR dr7.get_R_W1() == 0 ||
BX_CPU_THIS_PTR dr7.get_R_W2() == 0 ||
BX_CPU_THIS_PTR dr7.get_R_W3() == 0)
{
BX_INFO(("MOV_DdRd(): code breakpoint is set"));
BX_CPU_THIS_PTR async_event = 1;
}
}
#endif
TLB_flush(); // the DR7 write could enable some breakpoints
break;
default:
BX_ERROR(("MOV_DdRd: #UD - register index out of range"));
exception(BX_UD_EXCEPTION, 0);
}
}
void BX_CPP_AttrRegparmN(1) BX_CPU_C::MOV_RdDd(bxInstruction_c *i)
{
Bit32u val_32;
#if BX_SUPPORT_VMX
VMexit_DR_Access(i, 1 /* read */);
#endif
#if BX_CPU_LEVEL >= 4
if (BX_CPU_THIS_PTR cr4.get_DE()) {
if ((i->nnn() & 0xE) == 4) {
BX_ERROR(("MOV_RdDd: access to DR4/DR5 causes #UD"));
exception(BX_UD_EXCEPTION, 0);
}
}
#endif
// Note: processor clears GD upon entering debug exception
// handler, to allow access to the debug registers
if (BX_CPU_THIS_PTR dr7.get_GD()) {
BX_ERROR(("MOV_RdDd: DR7 GD bit is set"));
BX_CPU_THIS_PTR debug_trap |= BX_DEBUG_DR_ACCESS_BIT;
exception(BX_DB_EXCEPTION, 0);
}
if (!real_mode() && CPL!=0) {
BX_ERROR(("MOV_RdDd: CPL!=0 not in real mode"));
exception(BX_GP_EXCEPTION, 0);
}
/* This instruction is always treated as a register-to-register,
* regardless of the encoding of the MOD field in the MODRM byte.
*/
if (!i->modC0())
BX_PANIC(("MOV_RdDd(): rm field not a register!"));
switch (i->nnn()) {
case 0: // DR0
case 1: // DR1
case 2: // DR2
case 3: // DR3
val_32 = (Bit32u) BX_CPU_THIS_PTR dr[i->nnn()];
break;
case 4: // DR4
// DR4 aliased to DR6 by default. With Debug Extensions ON,
// access to DR4 causes #UD
case 6: // DR6
val_32 = BX_CPU_THIS_PTR dr6.get32();
break;
case 5: // DR5
// DR5 aliased to DR7 by default. With Debug Extensions ON,
// access to DR5 causes #UD
case 7: // DR7
val_32 = BX_CPU_THIS_PTR dr7.get32();
break;
default:
BX_ERROR(("MOV_RdDd: #UD - register index out of range"));
exception(BX_UD_EXCEPTION, 0);
}
BX_WRITE_32BIT_REGZ(i->rm(), val_32);
}
#if BX_SUPPORT_X86_64
void BX_CPP_AttrRegparmN(1) BX_CPU_C::MOV_DqRq(bxInstruction_c *i)
{
#if BX_SUPPORT_VMX
VMexit_DR_Access(i, 0 /* write */);
#endif
if (BX_CPU_THIS_PTR cr4.get_DE()) {
if ((i->nnn() & 0xE) == 4) {
BX_ERROR(("MOV_DqRq: access to DR4/DR5 causes #UD"));
exception(BX_UD_EXCEPTION, 0);
}
}
if (i->nnn() >= 8) {
BX_ERROR(("MOV_DqRq: #UD - register index out of range"));
exception(BX_UD_EXCEPTION, 0);
}
// Note: processor clears GD upon entering debug exception
// handler, to allow access to the debug registers
if (BX_CPU_THIS_PTR dr7.get_GD()) {
BX_ERROR(("MOV_DqRq: DR7 GD bit is set"));
BX_CPU_THIS_PTR debug_trap |= BX_DEBUG_DR_ACCESS_BIT;
exception(BX_DB_EXCEPTION, 0);
}
/* #GP(0) if CPL is not 0 */
if (CPL != 0) {
BX_ERROR(("MOV_DqRq: #GP(0) if CPL is not 0"));
exception(BX_GP_EXCEPTION, 0);
}
invalidate_prefetch_q();
/* This instruction is always treated as a register-to-register,
* regardless of the encoding of the MOD field in the MODRM byte.
*/
if (!i->modC0())
BX_PANIC(("MOV_DqRq(): rm field not a register!"));
Bit64u val_64 = BX_READ_64BIT_REG(i->rm());
switch (i->nnn()) {
case 0: // DR0
case 1: // DR1
case 2: // DR2
case 3: // DR3
TLB_invlpg(val_64);
BX_CPU_THIS_PTR dr[i->nnn()] = val_64;
break;
case 4: // DR4
// DR4 aliased to DR6 by default. With Debug Extensions ON,
// access to DR4 causes #UD
case 6: // DR6
if (GET32H(val_64)) {
BX_ERROR(("MOV_DqRq: attempt to set upper part of DR6"));
exception(BX_GP_EXCEPTION, 0);
}
// On Pentium+, bit12 is always zero
BX_CPU_THIS_PTR dr6.val32 = (BX_CPU_THIS_PTR dr6.val32 & 0xffff0ff0) |
(val_64 & 0x0000e00f);
break;
case 5: // DR5
// DR5 aliased to DR7 by default. With Debug Extensions ON,
// access to DR5 causes #UD
case 7: // DR7
// Note: 486+ ignore GE and LE flags. On the 386, exact
// data breakpoint matching does not occur unless it is enabled
// by setting the LE and/or GE flags.
if (GET32H(val_64)) {
BX_ERROR(("MOV_DqRq: attempt to set upper part of DR7"));
exception(BX_GP_EXCEPTION, 0);
}
// Pentium+: bits15,14,12 are hardwired to 0, rest are settable.
// Even bits 11,10 are changeable though reserved.
BX_CPU_THIS_PTR dr7.set32((val_64 & 0xffff2fff) | 0x00000400);
#if BX_X86_DEBUGGER
if ((BX_CPU_THIS_PTR dr7.get_R_W0() == BX_HWDebugInstruction && BX_CPU_THIS_PTR dr7.get_LEN0()) ||
(BX_CPU_THIS_PTR dr7.get_R_W1() == BX_HWDebugInstruction && BX_CPU_THIS_PTR dr7.get_LEN1()) ||
(BX_CPU_THIS_PTR dr7.get_R_W2() == BX_HWDebugInstruction && BX_CPU_THIS_PTR dr7.get_LEN2()) ||
(BX_CPU_THIS_PTR dr7.get_R_W3() == BX_HWDebugInstruction && BX_CPU_THIS_PTR dr7.get_LEN3()))
{
// Instruction breakpoint with LENx not 00b (1-byte length)
BX_ERROR(("MOV_DqRq: write of %08x, R/W=00b LEN!=00b", BX_CPU_THIS_PTR dr7.get32()));
}
// if we have code breakpoints enabled then we must check
// breakpoints condition in cpu loop
if (BX_CPU_THIS_PTR dr7.get_bp_enabled()) {
if (BX_CPU_THIS_PTR dr7.get_R_W0() == 0 ||
BX_CPU_THIS_PTR dr7.get_R_W1() == 0 ||
BX_CPU_THIS_PTR dr7.get_R_W2() == 0 ||
BX_CPU_THIS_PTR dr7.get_R_W3() == 0)
{
BX_INFO(("MOV_DdRd(): code breakpoint is set"));
BX_CPU_THIS_PTR async_event = 1;
}
}
#endif
TLB_flush(); // the DR7 write could enable some breakpoints
break;
default:
BX_ERROR(("MOV_DqRq: #UD - register index out of range"));
exception(BX_UD_EXCEPTION, 0);
}
}
void BX_CPP_AttrRegparmN(1) BX_CPU_C::MOV_RqDq(bxInstruction_c *i)
{
Bit64u val_64;
#if BX_SUPPORT_VMX
VMexit_DR_Access(i, 1 /* read */);
#endif
if (BX_CPU_THIS_PTR cr4.get_DE()) {
if ((i->nnn() & 0xE) == 4) {
BX_ERROR(("MOV_RqDq: access to DR4/DR5 causes #UD"));
exception(BX_UD_EXCEPTION, 0);
}
}
if (i->nnn() >= 8) {
BX_ERROR(("MOV_RqDq: #UD - register index out of range"));
exception(BX_UD_EXCEPTION, 0);
}
// Note: processor clears GD upon entering debug exception
// handler, to allow access to the debug registers
if (BX_CPU_THIS_PTR dr7.get_GD()) {
BX_ERROR(("MOV_RqDq: DR7 GD bit is set"));
BX_CPU_THIS_PTR debug_trap |= BX_DEBUG_DR_ACCESS_BIT;
exception(BX_DB_EXCEPTION, 0);
}
/* #GP(0) if CPL is not 0 */
if (CPL != 0) {
BX_ERROR(("MOV_RqDq: #GP(0) if CPL is not 0"));
exception(BX_GP_EXCEPTION, 0);
}
/* This instruction is always treated as a register-to-register,
* regardless of the encoding of the MOD field in the MODRM byte.
*/
if (!i->modC0())
BX_PANIC(("MOV_RqDq(): rm field not a register!"));
switch (i->nnn()) {
case 0: // DR0
case 1: // DR1
case 2: // DR2
case 3: // DR3
val_64 = BX_CPU_THIS_PTR dr[i->nnn()];
break;
case 4: // DR4
// DR4 aliased to DR6 by default. With Debug Extensions ON,
// access to DR4 causes #UD
case 6: // DR6
val_64 = BX_CPU_THIS_PTR dr6.get32();
break;
case 5: // DR5
// DR5 aliased to DR7 by default. With Debug Extensions ON,
// access to DR5 causes #UD
case 7: // DR7
val_64 = BX_CPU_THIS_PTR dr7.get32();
break;
default:
BX_ERROR(("MOV_RqDq: #UD - register index out of range"));
exception(BX_UD_EXCEPTION, 0);
}
BX_WRITE_64BIT_REG(i->rm(), val_64);
}
#endif // #if BX_SUPPORT_X86_64
void BX_CPP_AttrRegparmN(1) BX_CPU_C::MOV_CR0Rd(bxInstruction_c *i)
{
if (!real_mode() && CPL!=0) {
BX_ERROR(("MOV_CR0Rd: CPL!=0 not in real mode"));
exception(BX_GP_EXCEPTION, 0);
}
invalidate_prefetch_q();
Bit32u val_32 = BX_READ_32BIT_REG(i->rm());
#if BX_SUPPORT_VMX
val_32 = VMexit_CR0_Write(i, val_32);
#endif
if (! SetCR0(val_32))
exception(BX_GP_EXCEPTION, 0);
BX_INSTR_TLB_CNTRL(BX_CPU_ID, BX_INSTR_MOV_CR0, val_32);
}
void BX_CPP_AttrRegparmN(1) BX_CPU_C::MOV_CR2Rd(bxInstruction_c *i)
{
if (!real_mode() && CPL!=0) {
BX_ERROR(("MOV_CR2Rd: CPL!=0 not in real mode"));
exception(BX_GP_EXCEPTION, 0);
}
BX_CPU_THIS_PTR cr2 = BX_READ_32BIT_REG(i->rm());
}
void BX_CPP_AttrRegparmN(1) BX_CPU_C::MOV_CR3Rd(bxInstruction_c *i)
{
if (!real_mode() && CPL!=0) {
BX_ERROR(("MOV_CR3Rd: CPL!=0 not in real mode"));
exception(BX_GP_EXCEPTION, 0);
}
invalidate_prefetch_q();
Bit32u val_32 = BX_READ_32BIT_REG(i->rm());
#if BX_SUPPORT_VMX
VMexit_CR3_Write(i, val_32);
#endif
#if BX_CPU_LEVEL >= 6
if (BX_CPU_THIS_PTR cr0.get_PG() && BX_CPU_THIS_PTR cr4.get_PAE() && !long_mode()) {
if (! CheckPDPTR(val_32)) {
BX_ERROR(("SetCR3(): PDPTR check failed !"));
exception(BX_GP_EXCEPTION, 0);
}
}
#endif
if (! SetCR3(val_32))
exception(BX_GP_EXCEPTION, 0);
BX_INSTR_TLB_CNTRL(BX_CPU_ID, BX_INSTR_MOV_CR3, val_32);
}
void BX_CPP_AttrRegparmN(1) BX_CPU_C::MOV_CR4Rd(bxInstruction_c *i)
{
#if BX_CPU_LEVEL >= 4
if (!real_mode() && CPL!=0) {
BX_ERROR(("MOV_CR4Rd: CPL!=0 not in real mode"));
exception(BX_GP_EXCEPTION, 0);
}
invalidate_prefetch_q();
Bit32u val_32 = BX_READ_32BIT_REG(i->rm());
#if BX_SUPPORT_VMX
val_32 = VMexit_CR4_Write(i, val_32);
#endif
if (! SetCR4(val_32))
exception(BX_GP_EXCEPTION, 0);
BX_INSTR_TLB_CNTRL(BX_CPU_ID, BX_INSTR_MOV_CR4, val_32);
#endif
}
void BX_CPP_AttrRegparmN(1) BX_CPU_C::MOV_RdCR0(bxInstruction_c *i)
{
if (!real_mode() && CPL!=0) {
BX_ERROR(("MOV_RdCR0: CPL!=0 not in real mode"));
exception(BX_GP_EXCEPTION, 0);
}
Bit32u val_32 = (Bit32u) read_CR0(); /* correctly handle VMX */
BX_WRITE_32BIT_REGZ(i->rm(), val_32);
}
void BX_CPP_AttrRegparmN(1) BX_CPU_C::MOV_RdCR2(bxInstruction_c *i)
{
if (!real_mode() && CPL!=0) {
BX_ERROR(("MOV_RdCd: CPL!=0 not in real mode"));
exception(BX_GP_EXCEPTION, 0);
}
BX_WRITE_32BIT_REGZ(i->rm(), (Bit32u) BX_CPU_THIS_PTR cr2);
}
void BX_CPP_AttrRegparmN(1) BX_CPU_C::MOV_RdCR3(bxInstruction_c *i)
{
if (!real_mode() && CPL!=0) {
BX_ERROR(("MOV_RdCd: CPL!=0 not in real mode"));
exception(BX_GP_EXCEPTION, 0);
}
#if BX_SUPPORT_VMX
VMexit_CR3_Read(i);
#endif
Bit32u val_32 = (Bit32u) BX_CPU_THIS_PTR cr3;
BX_WRITE_32BIT_REGZ(i->rm(), val_32);
}
void BX_CPP_AttrRegparmN(1) BX_CPU_C::MOV_RdCR4(bxInstruction_c *i)
{
#if BX_CPU_LEVEL >= 4
if (!real_mode() && CPL!=0) {
BX_ERROR(("MOV_RdCd: CPL!=0 not in real mode"));
exception(BX_GP_EXCEPTION, 0);
}
Bit32u val_32 = (Bit32u) read_CR4(); /* correctly handle VMX */
BX_WRITE_32BIT_REGZ(i->rm(), val_32);
#endif
}
#if BX_SUPPORT_X86_64
void BX_CPP_AttrRegparmN(1) BX_CPU_C::MOV_CR0Rq(bxInstruction_c *i)
{
if (CPL!=0) {
BX_ERROR(("MOV_CR0Rq: #GP(0) if CPL is not 0"));
exception(BX_GP_EXCEPTION, 0);
}
invalidate_prefetch_q();
Bit64u val_64 = BX_READ_64BIT_REG(i->rm());
if (i->nnn() == 0) {
// CR0
#if BX_SUPPORT_VMX
val_64 = VMexit_CR0_Write(i, val_64);
#endif
if (! SetCR0(val_64))
exception(BX_GP_EXCEPTION, 0);
BX_INSTR_TLB_CNTRL(BX_CPU_ID, BX_INSTR_MOV_CR0, (Bit32u) val_64);
}
else {
// CR8
#if BX_SUPPORT_VMX
VMexit_CR8_Write(i);
#endif
// CR8 is aliased to APIC->TASK PRIORITY register
// APIC.TPR[7:4] = CR8[3:0]
// APIC.TPR[3:0] = 0
// Reads of CR8 return zero extended APIC.TPR[7:4]
// Write to CR8 update APIC.TPR[7:4]
#if BX_SUPPORT_APIC
if (val_64 & BX_CONST64(0xfffffffffffffff0)) {
BX_ERROR(("MOV_CqRq: Attempt to set reserved bits of CR8"));
exception(BX_GP_EXCEPTION, 0);
}
#if BX_SUPPORT_VMX
if (BX_CPU_THIS_PTR in_vmx_guest && VMEXIT(VMX_VM_EXEC_CTRL2_TPR_SHADOW)) {
VMX_Write_VTPR((val_64 & 0xF) << 4);
}
#endif
else
{
BX_CPU_THIS_PTR lapic.set_tpr((val_64 & 0xF) << 4);
}
#endif
}
}
void BX_CPP_AttrRegparmN(1) BX_CPU_C::MOV_CR2Rq(bxInstruction_c *i)
{
if (i->nnn() != 2) {
BX_ERROR(("MOV_CR2Rq: #UD - register index out of range"));
exception(BX_UD_EXCEPTION, 0);
}
if (CPL!=0) {
BX_ERROR(("MOV_CR2Rq: #GP(0) if CPL is not 0"));
exception(BX_GP_EXCEPTION, 0);
}
BX_CPU_THIS_PTR cr2 = BX_READ_64BIT_REG(i->rm());
}
void BX_CPP_AttrRegparmN(1) BX_CPU_C::MOV_CR3Rq(bxInstruction_c *i)
{
if (i->nnn() != 3) {
BX_ERROR(("MOV_CR3Rq: #UD - register index out of range"));
exception(BX_UD_EXCEPTION, 0);
}
if (CPL!=0) {
BX_ERROR(("MOV_CR3Rq: #GP(0) if CPL is not 0"));
exception(BX_GP_EXCEPTION, 0);
}
invalidate_prefetch_q();
Bit64u val_64 = BX_READ_64BIT_REG(i->rm());
#if BX_SUPPORT_VMX
VMexit_CR3_Write(i, val_64);
#endif
// no PDPTR checks in long mode
if (! SetCR3(val_64))
exception(BX_GP_EXCEPTION, 0);
BX_INSTR_TLB_CNTRL(BX_CPU_ID, BX_INSTR_MOV_CR3, val_64);
}
void BX_CPP_AttrRegparmN(1) BX_CPU_C::MOV_CR4Rq(bxInstruction_c *i)
{
if (i->nnn() != 4) {
BX_ERROR(("MOV_CR4Rq: #UD - register index out of range"));
exception(BX_UD_EXCEPTION, 0);
}
if (CPL!=0) {
BX_ERROR(("MOV_CR4Rq: #GP(0) if CPL is not 0"));
exception(BX_GP_EXCEPTION, 0);
}
invalidate_prefetch_q();
Bit64u val_64 = BX_READ_64BIT_REG(i->rm());
#if BX_SUPPORT_VMX
val_64 = VMexit_CR4_Write(i, val_64);
#endif
BX_DEBUG(("MOV_CqRq: write to CR4 of %08x:%08x", GET32H(val_64), GET32L(val_64)));
if (! SetCR4(val_64))
exception(BX_GP_EXCEPTION, 0);
BX_INSTR_TLB_CNTRL(BX_CPU_ID, BX_INSTR_MOV_CR4, (Bit32u) val_64);
}
void BX_CPP_AttrRegparmN(1) BX_CPU_C::MOV_RqCR0(bxInstruction_c *i)
{
// mov control register data to register
Bit64u val_64 = 0;
if (CPL!=0) {
BX_ERROR(("MOV_RqCq: #GP(0) if CPL is not 0"));
exception(BX_GP_EXCEPTION, 0);
}
if (i->nnn() == 0) {
// CR0
val_64 = read_CR0(); /* correctly handle VMX */
}
else {
// CR8
#if BX_SUPPORT_VMX
VMexit_CR8_Read(i);
if (BX_CPU_THIS_PTR in_vmx_guest && VMEXIT(VMX_VM_EXEC_CTRL2_TPR_SHADOW)) {
val_64 = (VMX_Read_VTPR() >> 4) & 0xf;
}
else
#endif
{
// CR8 is aliased to APIC->TASK PRIORITY register
// APIC.TPR[7:4] = CR8[3:0]
// APIC.TPR[3:0] = 0
// Reads of CR8 return zero extended APIC.TPR[7:4]
// Write to CR8 update APIC.TPR[7:4]
#if BX_SUPPORT_APIC
val_64 = (BX_CPU_THIS_PTR lapic.get_tpr() >> 4) & 0xF;
#endif
}
}
BX_WRITE_64BIT_REG(i->rm(), val_64);
}
void BX_CPP_AttrRegparmN(1) BX_CPU_C::MOV_RqCR2(bxInstruction_c *i)
{
if (i->nnn() != 2) {
BX_ERROR(("MOV_RqCR2: #UD - register index out of range"));
exception(BX_UD_EXCEPTION, 0);
}
if (CPL!=0) {
BX_ERROR(("MOV_RqCR2: #GP(0) if CPL is not 0"));
exception(BX_GP_EXCEPTION, 0);
}
BX_WRITE_64BIT_REG(i->rm(), BX_CPU_THIS_PTR cr2);
}
void BX_CPP_AttrRegparmN(1) BX_CPU_C::MOV_RqCR3(bxInstruction_c *i)
{
if (i->nnn() != 3) {
BX_ERROR(("MOV_RqCR3: #UD - register index out of range"));
exception(BX_UD_EXCEPTION, 0);
}
if (CPL!=0) {
BX_ERROR(("MOV_RqCR3: #GP(0) if CPL is not 0"));
exception(BX_GP_EXCEPTION, 0);
}
#if BX_SUPPORT_VMX
VMexit_CR3_Read(i);
#endif
BX_WRITE_64BIT_REG(i->rm(), BX_CPU_THIS_PTR cr3);
}
void BX_CPP_AttrRegparmN(1) BX_CPU_C::MOV_RqCR4(bxInstruction_c *i)
{
if (i->nnn() != 4) {
BX_ERROR(("MOV_RqCR4: #UD - register index out of range"));
exception(BX_UD_EXCEPTION, 0);
}
if (CPL!=0) {
BX_ERROR(("MOV_RqCR4: #GP(0) if CPL is not 0"));
exception(BX_GP_EXCEPTION, 0);
}
Bit64u val_64 = read_CR4(); /* correctly handle VMX */
BX_WRITE_64BIT_REG(i->rm(), val_64);
}
#endif // #if BX_SUPPORT_X86_64
void BX_CPP_AttrRegparmN(1) BX_CPU_C::LMSW_Ew(bxInstruction_c *i)
{
Bit16u msw;
if (!real_mode() && CPL!=0) {
BX_ERROR(("LMSW: CPL!=0 not in real mode"));
exception(BX_GP_EXCEPTION, 0);
}
if (i->modC0()) {
msw = BX_READ_16BIT_REG(i->rm());
}
else {
/* use RMAddr(i) to save address for VMexit */
RMAddr(i) = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
/* pointer, segment address pair */
msw = read_virtual_word(i->seg(), RMAddr(i));
}
// LMSW does not affect PG,CD,NW,AM,WP,NE,ET bits, and cannot clear PE
#if BX_SUPPORT_VMX
msw = VMexit_LMSW(i, msw);
#endif
// LMSW cannot clear PE
if (BX_CPU_THIS_PTR cr0.get_PE())
msw |= 0x1; // adjust PE bit to current value of 1
msw &= 0xf; // LMSW only affects last 4 flags
Bit32u cr0 = (BX_CPU_THIS_PTR cr0.get32() & 0xfffffff0) | msw;
if (! SetCR0(cr0))
exception(BX_GP_EXCEPTION, 0);
}
void BX_CPP_AttrRegparmN(1) BX_CPU_C::SMSW_EwR(bxInstruction_c *i)
{
Bit32u msw = (Bit32u) read_CR0(); // handle CR0 shadow in VMX
if (i->os32L()) {
BX_WRITE_32BIT_REGZ(i->rm(), msw);
}
else {
BX_WRITE_16BIT_REG(i->rm(), msw & 0xffff);
}
}
void BX_CPP_AttrRegparmN(1) BX_CPU_C::SMSW_EwM(bxInstruction_c *i)
{
Bit16u msw = read_CR0() & 0xffff; // handle CR0 shadow in VMX
bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
write_virtual_word(i->seg(), eaddr, msw);
}
void BX_CPP_AttrRegparmN(1) BX_CPU_C::MOV_TdRd(bxInstruction_c *i)
{
#if BX_CPU_LEVEL <= 4
BX_PANIC(("MOV_TdRd: Still not implemented"));
#else
// Pentium+ does not have TRx. They were redesigned using the MSRs.
BX_INFO(("MOV_TdRd: causes #UD"));
exception(BX_UD_EXCEPTION, 0);
#endif
}
void BX_CPP_AttrRegparmN(1) BX_CPU_C::MOV_RdTd(bxInstruction_c *i)
{
#if BX_CPU_LEVEL <= 4
BX_PANIC(("MOV_RdTd: Still not implemented"));
#else
// Pentium+ does not have TRx. They were redesigned using the MSRs.
BX_INFO(("MOV_RdTd: causes #UD"));
exception(BX_UD_EXCEPTION, 0);
#endif
}
bx_address BX_CPU_C::read_CR0(void)
{
bx_address cr0_val = BX_CPU_THIS_PTR cr0.get32();
#if BX_SUPPORT_VMX
if (BX_CPU_THIS_PTR in_vmx_guest) {
VMCS_CACHE *vm = &BX_CPU_THIS_PTR vmcs;
cr0_val = (cr0_val & ~vm->vm_cr0_mask) | (vm->vm_cr0_read_shadow & vm->vm_cr0_mask);
}
#endif
return cr0_val;
}
#if BX_CPU_LEVEL > 3
bx_address BX_CPU_C::read_CR4(void)
{
bx_address cr4_val = BX_CPU_THIS_PTR cr4.get32();
#if BX_SUPPORT_VMX
if (BX_CPU_THIS_PTR in_vmx_guest) {
VMCS_CACHE *vm = &BX_CPU_THIS_PTR vmcs;
cr4_val = (cr4_val & ~vm->vm_cr4_mask) | (vm->vm_cr4_read_shadow & vm->vm_cr4_mask);
}
#endif
return cr4_val;
}
#endif
bx_bool BX_CPP_AttrRegparmN(1) BX_CPU_C::check_CR0(bx_address cr0_val)
{
bx_cr0_t temp_cr0;
#if BX_SUPPORT_X86_64
if (GET32H(cr0_val)) {
BX_ERROR(("check_CR0(): trying to set CR0 > 32 bits"));
return 0;
}
#endif
temp_cr0.set32((Bit32u) cr0_val);
if (temp_cr0.get_PG() && !temp_cr0.get_PE()) {
BX_ERROR(("check_CR0(0x%08x): attempt to set CR0.PG with CR0.PE cleared !", temp_cr0.get32()));
return 0;
}
#if BX_CPU_LEVEL >= 4
if (temp_cr0.get_NW() && !temp_cr0.get_CD()) {
BX_ERROR(("check_CR0(0x%08x): attempt to set CR0.NW with CR0.CD cleared !", temp_cr0.get32()));
return 0;
}
#endif
#if BX_SUPPORT_VMX
if (BX_CPU_THIS_PTR in_vmx) {
if (!temp_cr0.get_NE()) {
BX_ERROR(("check_CR0(0x%08x): attempt to clear CR0.NE in vmx mode !", temp_cr0.get32()));
return 0;
}
if (!BX_CPU_THIS_PTR in_vmx_guest && !SECONDARY_VMEXEC_CONTROL(VMX_VM_EXEC_CTRL3_UNRESTRICTED_GUEST)) {
if (!temp_cr0.get_PE() || !temp_cr0.get_PG()) {
BX_ERROR(("check_CR0(0x%08x): attempt to clear CR0.PE/CR0.PG in vmx mode !", temp_cr0.get32()));
return 0;
}
}
}
#endif
return 1;
}
bx_bool BX_CPP_AttrRegparmN(1) BX_CPU_C::SetCR0(bx_address val)
{
if (! check_CR0(val)) return 0;
Bit32u val_32 = GET32L(val);
bx_bool pg = (val_32 >> 31) & 0x1;
#if BX_SUPPORT_X86_64
if (! BX_CPU_THIS_PTR cr0.get_PG() && pg) {
if (BX_CPU_THIS_PTR efer.get_LME()) {
if (!BX_CPU_THIS_PTR cr4.get_PAE()) {
BX_ERROR(("SetCR0: attempt to enter x86-64 long mode without enabling CR4.PAE !"));
return 0;
}
if (BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.l) {
BX_ERROR(("SetCR0: attempt to enter x86-64 long mode with CS.L !"));
return 0;
}
if (BX_CPU_THIS_PTR tr.cache.type <= 3) {
BX_ERROR(("SetCR0: attempt to enter x86-64 long mode with TSS286 in TR !"));
return 0;
}
BX_CPU_THIS_PTR efer.set_LMA(1);
}
}
else if (BX_CPU_THIS_PTR cr0.get_PG() && ! pg) {
if (BX_CPU_THIS_PTR cpu_mode == BX_MODE_LONG_64) {
BX_ERROR(("SetCR0(): attempt to leave 64 bit mode directly to legacy mode !"));
return 0;
}
if (BX_CPU_THIS_PTR efer.get_LMA()) {
if (BX_CPU_THIS_PTR cr4.get_PCIDE()) {
BX_ERROR(("SetCR0(): attempt to leave 64 bit mode with CR4.PCIDE set !"));
return 0;
}
if (BX_CPU_THIS_PTR gen_reg[BX_64BIT_REG_RIP].dword.hrx != 0) {
BX_PANIC(("SetCR0(): attempt to leave x86-64 LONG mode with RIP upper != 0"));
}
BX_CPU_THIS_PTR efer.set_LMA(0);
}
}
#endif // #if BX_SUPPORT_X86_64
Bit32u oldCR0 = BX_CPU_THIS_PTR cr0.get32();
#if BX_CPU_LEVEL >= 6
if (pg && BX_CPU_THIS_PTR cr4.get_PAE() && !long_mode()) {
if (! CheckPDPTR(BX_CPU_THIS_PTR cr3)) {
BX_ERROR(("SetCR0(): PDPTR check failed !"));
return 0;
}
}
#endif
// handle reserved bits behaviour
#if BX_CPU_LEVEL == 3
val_32 = val_32 | 0x7ffffff0;
#elif BX_CPU_LEVEL == 4
val_32 = (val_32 | 0x00000010) & 0xe005003f;
#elif BX_CPU_LEVEL == 5
val_32 = val_32 | 0x00000010;
#elif BX_CPU_LEVEL == 6
val_32 = (val_32 | 0x00000010) & 0xe005003f;
#else
#error "SetCR0: implement reserved bits behaviour for this CPU_LEVEL"
#endif
BX_CPU_THIS_PTR cr0.set32(val_32);
#if BX_CPU_LEVEL >= 4 && BX_SUPPORT_ALIGNMENT_CHECK
handleAlignmentCheck(/* CR0.AC reloaded */);
#endif
handleCpuModeChange();
#if BX_CPU_LEVEL >= 6
handleSseModeChange();
#if BX_SUPPORT_AVX
handleAvxModeChange();
#endif
#endif
// Modification of PG,PE flushes TLB cache according to docs.
// Additionally, the TLB strategy is based on the current value of
// WP, so if that changes we must also flush the TLB.
if ((oldCR0 & 0x80010001) != (val_32 & 0x80010001))
TLB_flush(); // Flush Global entries also
return 1;
}
#if BX_CPU_LEVEL >= 4
Bit32u BX_CPU_C::get_cr4_allow_mask(void)
{
Bit32u allowMask = 0;
// CR4 bits definitions:
// [31-19] Reserved, Must be Zero
// [18] OSXSAVE: Operating System XSAVE Support R/W
// [17] PCIDE: PCID Support R/W
// [16] FSGSBASE: FS/GS BASE access R/W
// [15] Reserved, Must be Zero
// [14] SMXE: SMX Extensions R/W
// [13] VMXE: VMX Extensions R/W
// [12-11] Reserved, Must be Zero
// [10] OSXMMEXCPT: Operating System Unmasked Exception Support R/W
// [9] OSFXSR: Operating System FXSAVE/FXRSTOR Support R/W
// [8] PCE: Performance-Monitoring Counter Enable R/W
// [7] PGE: Page-Global Enable R/W
// [6] MCE: Machine Check Enable R/W
// [5] PAE: Physical-Address Extension R/W
// [4] PSE: Page Size Extensions R/W
// [3] DE: Debugging Extensions R/W
// [2] TSD: Time Stamp Disable R/W
// [1] PVI: Protected-Mode Virtual Interrupts R/W
// [0] VME: Virtual-8086 Mode Extensions R/W
#if BX_CPU_LEVEL >= 5
/* VME */
if (bx_cpuid_support_vme())
allowMask |= BX_CR4_VME_MASK | BX_CR4_PVI_MASK;
allowMask |= BX_CR4_TSD_MASK;
if (bx_cpuid_support_debug_extensions())
allowMask |= BX_CR4_DE_MASK;
if (bx_cpuid_support_pse())
allowMask |= BX_CR4_PSE_MASK;
#endif
#if BX_CPU_LEVEL >= 6
if (bx_cpuid_support_pae())
allowMask |= BX_CR4_PAE_MASK;
#endif
#if BX_CPU_LEVEL >= 5
// NOTE: exception 18 (#MC) never appears in Bochs
allowMask |= BX_CR4_MCE_MASK;
#endif
#if BX_CPU_LEVEL >= 6
if (bx_cpuid_support_pge())
allowMask |= BX_CR4_PGE_MASK;
allowMask |= BX_CR4_PCE_MASK;
/* OSFXSR */
if (bx_cpuid_support_fxsave_fxrstor())
allowMask |= BX_CR4_OSFXSR_MASK;
/* OSXMMEXCPT */
if (bx_cpuid_support_sse())
allowMask |= BX_CR4_OSXMMEXCPT_MASK;
#endif
#if BX_SUPPORT_VMX
allowMask |= BX_CR4_VMXE_MASK;
#endif
#if BX_SUPPORT_SMX
allowMask |= BX_CR4_SMXE_MASK;
#endif
#if BX_SUPPORT_X86_64
if (bx_cpuid_support_pcid())
allowMask |= BX_CR4_PCIDE_MASK;
if (bx_cpuid_support_fsgsbase())
allowMask |= BX_CR4_FSGSBASE_MASK;
#endif
#if BX_CPU_LEVEL >= 6
/* OSXSAVE */
if (bx_cpuid_support_xsave())
allowMask |= BX_CR4_OSXSAVE_MASK;
#endif
return allowMask;
}
bx_bool BX_CPP_AttrRegparmN(1) BX_CPU_C::check_CR4(bx_address cr4_val)
{
bx_cr4_t temp_cr4;
bx_address cr4_allow_mask = get_cr4_allow_mask();
temp_cr4.val32 = (Bit32u) cr4_val;
#if BX_SUPPORT_X86_64
if (long_mode()) {
if(! temp_cr4.get_PAE()) {
BX_ERROR(("check_CR4(): attempt to clear CR4.PAE when EFER.LMA=1"));
return 0;
}
}
if (temp_cr4.get_PCIDE()) {
if (! long_mode()) {
BX_ERROR(("check_CR4(): attempt to set CR4.PCIDE when EFER.LMA=0"));
return 0;
}
}
#endif
#if BX_SUPPORT_VMX
if(! temp_cr4.get_VMXE()) {
if (BX_CPU_THIS_PTR in_vmx) {
BX_ERROR(("check_CR4(): attempt to clear CR4.VMXE in vmx mode"));
return 0;
}
}
else {
if (BX_CPU_THIS_PTR in_smm) {
BX_ERROR(("check_CR4(): attempt to set CR4.VMXE in smm mode"));
return 0;
}
}
#endif
// check if trying to set undefined bits
if (cr4_val & ~cr4_allow_mask) {
BX_ERROR(("check_CR4(): write of 0x%08x not supported (allowMask=0x%x)", (Bit32u) cr4_val, (Bit32u) cr4_allow_mask));
return 0;
}
return 1;
}
bx_bool BX_CPP_AttrRegparmN(1) BX_CPU_C::SetCR4(bx_address val)
{
if (! check_CR4(val)) return 0;
#if BX_CPU_LEVEL >= 6
// Modification of PGE,PAE,PSE,PCIDE flushes TLB cache according to docs.
if ((val & BX_CR4_FLUSH_TLB_MASK) != (BX_CPU_THIS_PTR cr4.val32 & BX_CR4_FLUSH_TLB_MASK)) {
// reload PDPTR if PGE,PAE or PSE changed
if (BX_CPU_THIS_PTR cr0.get_PG() && (val & BX_CR4_PAE_MASK) != 0 && !long_mode()) {
if (! CheckPDPTR(BX_CPU_THIS_PTR cr3)) {
BX_ERROR(("SetCR4(): PDPTR check failed !"));
return 0;
}
}
#if BX_SUPPORT_X86_64
else {
// if trying to enable CR4.PCIDE
if (! BX_CPU_THIS_PTR cr4.get_PCIDE() && (val & BX_CR4_PCIDE_MASK)) {
if (BX_CPU_THIS_PTR cr3 & 0xfff) {
BX_ERROR(("SetCR4(): Attempt to enable CR4.PCIDE with non-zero PCID !"));
return 0;
}
}
}
#endif
TLB_flush(); // Flush Global entries also.
}
#endif
BX_CPU_THIS_PTR cr4.set32((Bit32u) val);
#if BX_CPU_LEVEL >= 6
handleSseModeChange();
#if BX_SUPPORT_AVX
handleAvxModeChange();
#endif
#endif
return 1;
}
#endif // BX_CPU_LEVEL >= 4
bx_bool BX_CPP_AttrRegparmN(1) BX_CPU_C::SetCR3(bx_address val)
{
#if BX_SUPPORT_X86_64
if (long_mode()) {
if (! IsValidPhyAddr(val)) {
BX_ERROR(("SetCR3(): Attempt to write to reserved bits of CR3 !"));
return 0;
}
}
#endif
BX_CPU_THIS_PTR cr3 = val;
// flush TLB even if value does not change
#if BX_CPU_LEVEL >= 6
if (BX_CPU_THIS_PTR cr4.get_PGE())
TLB_flushNonGlobal(); // Don't flush Global entries.
else
#endif
TLB_flush(); // Flush Global entries also.
return 1;
}
void BX_CPP_AttrRegparmN(1) BX_CPU_C::CLTS(bxInstruction_c *i)
{
if (!real_mode() && CPL!=0) {
BX_ERROR(("CLTS: priveledge check failed, generate #GP(0)"));
exception(BX_GP_EXCEPTION, 0);
}
#if BX_SUPPORT_VMX
if(VMexit_CLTS(i)) return;
#endif
BX_CPU_THIS_PTR cr0.set_TS(0);
#if BX_CPU_LEVEL >= 6
handleSseModeChange();
#if BX_SUPPORT_AVX
handleAvxModeChange();
#endif
#endif
}
#if BX_X86_DEBUGGER
bx_bool BX_CPU_C::hwbreakpoint_check(bx_address laddr, unsigned opa, unsigned opb)
{
laddr = LPFOf(laddr);
Bit32u dr_op[4];
dr_op[0] = BX_CPU_THIS_PTR dr7.get_R_W0();
dr_op[1] = BX_CPU_THIS_PTR dr7.get_R_W1();
dr_op[2] = BX_CPU_THIS_PTR dr7.get_R_W2();
dr_op[3] = BX_CPU_THIS_PTR dr7.get_R_W3();
for (int n=0;n<4;n++) {
if ((dr_op[n] == opa || dr_op[n] == opb) && laddr == LPFOf(BX_CPU_THIS_PTR dr[n])) {
return 1;
}
}
return 0;
}
Bit32u BX_CPU_C::code_breakpoint_match(bx_address laddr)
{
if (BX_CPU_THIS_PTR get_RF() || BX_CPU_THIS_PTR in_repeat)
return 0;
if (BX_CPU_THIS_PTR dr7.get_bp_enabled()) {
Bit32u dr6_bits = hwdebug_compare(laddr, 1, BX_HWDebugInstruction, BX_HWDebugInstruction);
if (dr6_bits) {
// Add to the list of debug events thus far.
BX_CPU_THIS_PTR debug_trap |= dr6_bits;
BX_ERROR(("#DB: x86 code breakpoint catched"));
return dr6_bits;
}
}
return 0;
}
void BX_CPU_C::hwbreakpoint_match(bx_address laddr, unsigned len, unsigned rw)
{
if (BX_CPU_THIS_PTR dr7.get_bp_enabled()) {
// Only compare debug registers if any breakpoints are enabled
unsigned opa, opb, write = rw & 1;
opa = BX_HWDebugMemRW; // Read or Write always compares vs 11b
if (! write) // only compares vs 11b
opb = opa;
else // BX_WRITE or BX_RW; also compare vs 01b
opb = BX_HWDebugMemW;
Bit32u dr6_bits = hwdebug_compare(laddr, len, opa, opb);
if (dr6_bits) {
BX_CPU_THIS_PTR debug_trap |= dr6_bits;
BX_CPU_THIS_PTR async_event = 1;
}
}
}
Bit32u BX_CPU_C::hwdebug_compare(bx_address laddr_0, unsigned size,
unsigned opa, unsigned opb)
{
Bit32u dr7 = BX_CPU_THIS_PTR dr7.get32();
static bx_address alignment_mask[4] =
// 00b=1 01b=2 10b=undef(8) 11b=4
{ 0x0, 0x1, 0x7, 0x3 };
bx_address laddr_n = laddr_0 + (size - 1);
Bit32u dr_op[4], dr_len[4];
bx_bool ibpoint_found_n[4], ibpoint_found = 0;
dr_len[0] = BX_CPU_THIS_PTR dr7.get_LEN0();
dr_len[1] = BX_CPU_THIS_PTR dr7.get_LEN1();
dr_len[2] = BX_CPU_THIS_PTR dr7.get_LEN2();
dr_len[3] = BX_CPU_THIS_PTR dr7.get_LEN3();
dr_op[0] = BX_CPU_THIS_PTR dr7.get_R_W0();
dr_op[1] = BX_CPU_THIS_PTR dr7.get_R_W1();
dr_op[2] = BX_CPU_THIS_PTR dr7.get_R_W2();
dr_op[3] = BX_CPU_THIS_PTR dr7.get_R_W3();
for (unsigned n=0;n<4;n++) {
bx_address dr_start = BX_CPU_THIS_PTR dr[n] & ~alignment_mask[dr_len[n]];
bx_address dr_end = dr_start + alignment_mask[dr_len[n]];
ibpoint_found_n[n] = 0;
// See if this instruction address matches any breakpoints
if (dr7 & (3 << n*2)) {
if ((dr_op[n]==opa || dr_op[n]==opb) &&
(laddr_0 <= dr_end) &&
(laddr_n >= dr_start)) {
ibpoint_found_n[n] = 1;
ibpoint_found = 1;
}
}
}
// If *any* enabled breakpoints matched, then we need to
// set status bits for *all* breakpoints, even disabled ones,
// as long as they meet the other breakpoint criteria.
// dr6_mask is the return value. These bits represent the bits
// to be OR'd into DR6 as a result of the debug event.
Bit32u dr6_mask = 0;
if (ibpoint_found) {
if (ibpoint_found_n[0]) dr6_mask |= 0x1;
if (ibpoint_found_n[1]) dr6_mask |= 0x2;
if (ibpoint_found_n[2]) dr6_mask |= 0x4;
if (ibpoint_found_n[3]) dr6_mask |= 0x8;
}
return dr6_mask;
}
void BX_CPU_C::iobreakpoint_match(unsigned port, unsigned len)
{
// Only compare debug registers if any breakpoints are enabled
if (BX_CPU_THIS_PTR cr4.get_DE() && BX_CPU_THIS_PTR dr7.get_bp_enabled())
{
Bit32u dr6_bits = hwdebug_compare(port, len, BX_HWDebugIO, BX_HWDebugIO);
if (dr6_bits) {
BX_CPU_THIS_PTR debug_trap |= dr6_bits;
BX_CPU_THIS_PTR async_event = 1;
}
}
}
#endif
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