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Bochs/bochs/cpu/access.cc

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/////////////////////////////////////////////////////////////////////////
// $Id: access.cc,v 1.66 2006-06-09 22:29:06 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
#if BX_SUPPORT_X86_64
#define LPFOf(laddr) ((laddr) & BX_CONST64(0xfffffffffffff000))
#else
#define LPFOf(laddr) ((laddr) & 0xfffff000)
#endif
void BX_CPP_AttrRegparmN(3)
BX_CPU_C::write_virtual_checks(bx_segment_reg_t *seg, bx_address offset,
unsigned length)
{
Bit32u upper_limit;
#if BX_SUPPORT_X86_64
if (BX_CPU_THIS_PTR cpu_mode == BX_MODE_LONG_64) {
// do canonical checks
if (!IsCanonical(offset)) {
BX_ERROR(("Canonical Address Failure %08x%08x",(Bit32u)(offset >> 32),(Bit32u)(offset & 0xffffffff)));
exception(BX_GP_EXCEPTION, 0, 0);
}
seg->cache.valid |= SegAccessWOK;
return;
}
#endif
if (protected_mode()) {
if (seg->cache.valid==0) {
BX_DEBUG(("write_virtual_checks(): segment descriptor not valid"));
exception(BX_GP_EXCEPTION, 0, 0);
return;
}
if (seg->cache.p == 0) { /* not present */
BX_ERROR(("write_virtual_checks(): segment not present"));
exception(int_number(seg), 0, 0);
return;
}
switch (seg->cache.type) {
case 0: case 1: // read only
case 4: case 5: // read only, expand down
case 8: case 9: // execute only
case 10: case 11: // execute/read
case 12: case 13: // execute only, conforming
case 14: case 15: // execute/read-only, conforming
BX_ERROR(("write_virtual_checks(): no write access to seg"));
exception(BX_GP_EXCEPTION, 0, 0);
return;
case 2: case 3: /* read/write */
if (offset > (seg->cache.u.segment.limit_scaled - length + 1)
|| (length-1 > seg->cache.u.segment.limit_scaled))
{
BX_ERROR(("write_virtual_checks(): write beyond limit, r/w"));
exception(int_number(seg), 0, 0);
return;
}
if (seg->cache.u.segment.limit_scaled >= 7) {
// Mark cache as being OK type for succeeding writes. The limit
// checks still needs to be done though, but is more simple. We
// could probably also optimize that out with a flag for the case
// when limit is the maximum 32bit value. Limit should accomodate
// at least a dword, since we subtract from it in the simple
// limit check in other functions, and we don't want the value to roll.
// Only normal segments (not expand down) are handled this way.
seg->cache.valid |= SegAccessWOK;
}
break;
case 6: case 7: /* read write, expand down */
if (seg->cache.u.segment.d_b)
upper_limit = 0xffffffff;
else
upper_limit = 0x0000ffff;
if ((offset <= seg->cache.u.segment.limit_scaled) ||
(offset > upper_limit) ||
((upper_limit - offset) < (length - 1)))
{
BX_ERROR(("write_virtual_checks(): write beyond limit, r/w ED"));
exception(int_number(seg), 0, 0);
return;
}
break;
}
return;
}
else { /* real mode */
if (offset > (seg->cache.u.segment.limit_scaled - length + 1)
|| (length-1 > seg->cache.u.segment.limit_scaled))
{
BX_DEBUG(("write_virtual_checks(): write beyond limit (real mode)"));
exception(int_number(seg), 0, 0);
}
if (seg->cache.u.segment.limit_scaled >= 7) {
// Mark cache as being OK type for succeeding writes. See notes above.
seg->cache.valid |= SegAccessWOK;
}
}
}
void BX_CPP_AttrRegparmN(3)
BX_CPU_C::read_virtual_checks(bx_segment_reg_t *seg, bx_address offset,
unsigned length)
{
Bit32u upper_limit;
#if BX_SUPPORT_X86_64
if (BX_CPU_THIS_PTR cpu_mode == BX_MODE_LONG_64) {
// do canonical checks
if (!IsCanonical(offset)) {
BX_ERROR(("Canonical Address Failure %08x%08x",(Bit32u)(offset >> 32),(Bit32u)(offset & 0xffffffff)));
exception(BX_GP_EXCEPTION, 0, 0);
}
seg->cache.valid |= SegAccessROK;
return;
}
#endif
if (protected_mode()) {
if (seg->cache.valid==0) {
BX_DEBUG(("read_virtual_checks(): segment descriptor not valid"));
exception(BX_GP_EXCEPTION, 0, 0);
return;
}
if (seg->cache.p == 0) { /* not present */
BX_ERROR(("read_virtual_checks(): segment not present"));
exception(int_number(seg), 0, 0);
return;
}
switch (seg->cache.type) {
case 0: case 1: /* read only */
case 10: case 11: /* execute/read */
case 14: case 15: /* execute/read-only, conforming */
if (offset > (seg->cache.u.segment.limit_scaled - length + 1)
|| (length-1 > seg->cache.u.segment.limit_scaled))
{
BX_ERROR(("read_virtual_checks(): read beyond limit"));
exception(int_number(seg), 0, 0);
return;
}
if (seg->cache.u.segment.limit_scaled >= 7) {
// Mark cache as being OK type for succeeding reads. See notes for
// write checks; similar code.
seg->cache.valid |= SegAccessROK;
}
break;
case 2: case 3: /* read/write */
if (offset > (seg->cache.u.segment.limit_scaled - length + 1)
|| (length-1 > seg->cache.u.segment.limit_scaled))
{
BX_ERROR(("read_virtual_checks(): read beyond limit"));
exception(int_number(seg), 0, 0);
return;
}
if (seg->cache.u.segment.limit_scaled >= 7)
{
// Mark cache as being OK type for succeeding reads. See notes for
// write checks; similar code.
seg->cache.valid |= SegAccessROK;
}
break;
case 4: case 5: /* read only, expand down */
if (seg->cache.u.segment.d_b)
upper_limit = 0xffffffff;
else
upper_limit = 0x0000ffff;
if ((offset <= seg->cache.u.segment.limit_scaled) ||
(offset > upper_limit) || ((upper_limit - offset) < (length - 1)))
{
BX_ERROR(("read_virtual_checks(): read beyond limit"));
exception(int_number(seg), 0, 0);
return;
}
break;
case 6: case 7: /* read write, expand down */
if (seg->cache.u.segment.d_b)
upper_limit = 0xffffffff;
else
upper_limit = 0x0000ffff;
if ((offset <= seg->cache.u.segment.limit_scaled) ||
(offset > upper_limit) || ((upper_limit - offset) < (length - 1)))
{
BX_ERROR(("read_virtual_checks(): read beyond limit"));
exception(int_number(seg), 0, 0);
return;
}
break;
case 8: case 9: /* execute only */
case 12: case 13: /* execute only, conforming */
/* can't read or write an execute-only segment */
BX_ERROR(("read_virtual_checks(): execute only"));
exception(BX_GP_EXCEPTION, 0, 0);
return;
}
return;
}
else { /* real mode */
if (offset > (seg->cache.u.segment.limit_scaled - length + 1)
|| (length-1 > seg->cache.u.segment.limit_scaled))
{
BX_DEBUG(("read_virtual_checks(): read beyond limit (real mode)"));
exception(int_number(seg), 0, 0);
}
if (seg->cache.u.segment.limit_scaled >= 7) {
// Mark cache as being OK type for succeeding reads. See notes for
// write checks; similar code.
seg->cache.valid |= SegAccessROK;
}
}
}
char * BX_CPP_AttrRegparmN(1)
BX_CPU_C::strseg(bx_segment_reg_t *seg)
{
if (seg == &BX_CPU_THIS_PTR sregs[0]) return("ES");
else if (seg == &BX_CPU_THIS_PTR sregs[1]) return("CS");
else if (seg == &BX_CPU_THIS_PTR sregs[2]) return("SS");
else if (seg == &BX_CPU_THIS_PTR sregs[3]) return("DS");
else if (seg == &BX_CPU_THIS_PTR sregs[4]) return("FS");
else if (seg == &BX_CPU_THIS_PTR sregs[5]) return("GS");
else {
BX_PANIC(("undefined segment passed to strseg()!"));
return("??");
}
}
int BX_CPU_C::int_number(bx_segment_reg_t *seg)
{
if (seg == &BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS])
return(BX_SS_EXCEPTION);
else
return(BX_GP_EXCEPTION);
}
#if BX_SupportGuest2HostTLB
Bit8u* BX_CPP_AttrRegparmN(2)
BX_CPU_C::v2h_read_byte(bx_address laddr, unsigned pl)
{
Bit32u tlbIndex = BX_TLB_INDEX_OF(laddr);
bx_address lpf = LPFOf(laddr);
bx_TLB_entry *tlbEntry = &BX_CPU_THIS_PTR TLB.entry[tlbIndex];
if (tlbEntry->lpf == BX_TLB_LPF_VALUE(lpf)) {
// See if the TLB entry privilege level allows us read access
// from this CPL.
Bit32u accessBits = tlbEntry->accessBits;
if (accessBits & (1<<pl)) { // Read this pl OK.
bx_hostpageaddr_t hostPageAddr = tlbEntry->hostPageAddr;
Bit32u pageOffset = laddr & 0xfff;
Bit8u *hostAddr = (Bit8u*) (hostPageAddr | pageOffset);
return hostAddr;
}
}
return 0;
}
Bit8u* BX_CPP_AttrRegparmN(2)
BX_CPU_C::v2h_write_byte(bx_address laddr, unsigned pl)
{
Bit32u tlbIndex = BX_TLB_INDEX_OF(laddr);
bx_address lpf = LPFOf(laddr);
bx_TLB_entry *tlbEntry = &BX_CPU_THIS_PTR TLB.entry[tlbIndex];
if (tlbEntry->lpf == BX_TLB_LPF_VALUE(lpf))
{
// See if the TLB entry privilege level allows us write access
// from this CPL.
Bit32u accessBits = tlbEntry->accessBits;
if (accessBits & (0x04 << pl)) {
bx_hostpageaddr_t hostPageAddr = tlbEntry->hostPageAddr;
Bit32u pageOffset = laddr & 0xfff;
Bit8u *hostAddr = (Bit8u*) (hostPageAddr | pageOffset);
#if BX_SUPPORT_ICACHE
pageWriteStampTable.decWriteStamp(tlbEntry->ppf);
#endif
return hostAddr;
}
}
return 0;
}
Bit16u* BX_CPP_AttrRegparmN(2)
BX_CPU_C::v2h_read_word(bx_address laddr, unsigned pl)
{
Bit32u pageOffset = laddr & 0xfff;
if (pageOffset <= 0xffe) { // Make sure access does not span 2 pages.
Bit32u tlbIndex = BX_TLB_INDEX_OF(laddr);
bx_address lpf = LPFOf(laddr);
bx_TLB_entry *tlbEntry = &BX_CPU_THIS_PTR TLB.entry[tlbIndex];
if (tlbEntry->lpf == BX_TLB_LPF_VALUE(lpf)) {
// See if the TLB entry privilege level allows us read access
// from this CPL.
Bit32u accessBits = tlbEntry->accessBits;
if (accessBits & (1<<pl)) { // Read this pl OK.
bx_hostpageaddr_t hostPageAddr = tlbEntry->hostPageAddr;
Bit16u *hostAddr = (Bit16u*) (hostPageAddr | pageOffset);
return hostAddr;
}
}
}
return 0;
}
Bit16u* BX_CPP_AttrRegparmN(2)
BX_CPU_C::v2h_write_word(bx_address laddr, unsigned pl)
{
Bit32u pageOffset = laddr & 0xfff;
if (pageOffset <= 0xffe) { // Make sure access does not span 2 pages.
Bit32u tlbIndex = BX_TLB_INDEX_OF(laddr);
bx_address lpf = LPFOf(laddr);
bx_TLB_entry *tlbEntry = &BX_CPU_THIS_PTR TLB.entry[tlbIndex];
if (tlbEntry->lpf == BX_TLB_LPF_VALUE(lpf))
{
// See if the TLB entry privilege level allows us write access
// from this CPL.
Bit32u accessBits = tlbEntry->accessBits;
if (accessBits & (0x04 << pl)) {
bx_hostpageaddr_t hostPageAddr = tlbEntry->hostPageAddr;
Bit16u *hostAddr = (Bit16u*) (hostPageAddr | pageOffset);
#if BX_SUPPORT_ICACHE
pageWriteStampTable.decWriteStamp(tlbEntry->ppf);
#endif
return hostAddr;
}
}
}
return 0;
}
Bit32u* BX_CPP_AttrRegparmN(2)
BX_CPU_C::v2h_read_dword(bx_address laddr, unsigned pl)
{
Bit32u pageOffset = laddr & 0xfff;
if (pageOffset <= 0xffc) { // Make sure access does not span 2 pages.
Bit32u tlbIndex = BX_TLB_INDEX_OF(laddr);
bx_address lpf = LPFOf(laddr);
bx_TLB_entry *tlbEntry = &BX_CPU_THIS_PTR TLB.entry[tlbIndex];
if (tlbEntry->lpf == BX_TLB_LPF_VALUE(lpf)) {
// See if the TLB entry privilege level allows us read access
// from this CPL.
Bit32u accessBits = tlbEntry->accessBits;
if (accessBits & (1<<pl)) { // Read this pl OK.
bx_hostpageaddr_t hostPageAddr = tlbEntry->hostPageAddr;
Bit32u *hostAddr = (Bit32u*) (hostPageAddr | pageOffset);
return hostAddr;
}
}
}
return 0;
}
Bit32u* BX_CPP_AttrRegparmN(2)
BX_CPU_C::v2h_write_dword(bx_address laddr, unsigned pl)
{
Bit32u pageOffset = laddr & 0xfff;
if (pageOffset <= 0xffc) { // Make sure access does not span 2 pages.
Bit32u tlbIndex = BX_TLB_INDEX_OF(laddr);
bx_address lpf = LPFOf(laddr);
bx_TLB_entry *tlbEntry = &BX_CPU_THIS_PTR TLB.entry[tlbIndex];
if (tlbEntry->lpf == BX_TLB_LPF_VALUE(lpf))
{
// See if the TLB entry privilege level allows us write access
// from this CPL.
Bit32u accessBits = tlbEntry->accessBits;
if (accessBits & (0x04 << pl)) {
bx_hostpageaddr_t hostPageAddr = tlbEntry->hostPageAddr;
Bit32u *hostAddr = (Bit32u*) (hostPageAddr | pageOffset);
#if BX_SUPPORT_ICACHE
pageWriteStampTable.decWriteStamp(tlbEntry->ppf);
#endif
return hostAddr;
}
}
}
return 0;
}
Bit64u* BX_CPP_AttrRegparmN(2)
BX_CPU_C::v2h_read_qword(bx_address laddr, unsigned pl)
{
Bit32u pageOffset = laddr & 0xfff;
if (pageOffset <= 0xff8) { // Make sure access does not span 2 pages.
Bit32u tlbIndex = BX_TLB_INDEX_OF(laddr);
bx_address lpf = LPFOf(laddr);
bx_TLB_entry *tlbEntry = &BX_CPU_THIS_PTR TLB.entry[tlbIndex];
if (tlbEntry->lpf == BX_TLB_LPF_VALUE(lpf)) {
// See if the TLB entry privilege level allows us read access
// from this CPL.
Bit32u accessBits = tlbEntry->accessBits;
if (accessBits & (1<<pl)) { // Read this pl OK.
bx_hostpageaddr_t hostPageAddr = tlbEntry->hostPageAddr;
Bit64u *hostAddr = (Bit64u*) (hostPageAddr | pageOffset);
return hostAddr;
}
}
}
return 0;
}
Bit64u* BX_CPP_AttrRegparmN(2)
BX_CPU_C::v2h_write_qword(bx_address laddr, unsigned pl)
{
Bit32u pageOffset = laddr & 0xfff;
if (pageOffset <= 0xff8) { // Make sure access does not span 2 pages.
Bit32u tlbIndex = BX_TLB_INDEX_OF(laddr);
bx_address lpf = LPFOf(laddr);
bx_TLB_entry *tlbEntry = &BX_CPU_THIS_PTR TLB.entry[tlbIndex];
if (tlbEntry->lpf == BX_TLB_LPF_VALUE(lpf))
{
// See if the TLB entry privilege level allows us write access
// from this CPL.
Bit32u accessBits = tlbEntry->accessBits;
if (accessBits & (0x04 << pl)) {
bx_hostpageaddr_t hostPageAddr = tlbEntry->hostPageAddr;
Bit64u *hostAddr = (Bit64u*) (hostPageAddr | pageOffset);
#if BX_SUPPORT_ICACHE
pageWriteStampTable.decWriteStamp(tlbEntry->ppf);
#endif
return hostAddr;
}
}
}
return 0;
}
#endif // BX_SupportGuest2HostTLB
void BX_CPP_AttrRegparmN(3)
BX_CPU_C::write_virtual_byte(unsigned s, bx_address offset, Bit8u *data)
{
bx_address laddr;
bx_segment_reg_t *seg;
seg = &BX_CPU_THIS_PTR sregs[s];
if (seg->cache.valid & SegAccessWOK) {
if ((Is64BitMode() && IsCanonical(offset))
|| (offset <= seg->cache.u.segment.limit_scaled)) {
unsigned pl;
accessOK:
laddr = BX_CPU_THIS_PTR get_segment_base(s) + offset;
BX_INSTR_MEM_DATA(BX_CPU_ID, laddr, 1, BX_WRITE);
pl = (CPL==3);
#if BX_SupportGuest2HostTLB
Bit8u *hostAddr = v2h_write_byte(laddr, pl);
if (hostAddr) {
*hostAddr = *data;
return;
}
#endif
access_linear(laddr, 1, pl, BX_WRITE, (void *) data);
return;
}
}
write_virtual_checks(seg, offset, 1);
goto accessOK;
}
void BX_CPP_AttrRegparmN(3)
BX_CPU_C::write_virtual_word(unsigned s, bx_address offset, Bit16u *data)
{
bx_address laddr;
bx_segment_reg_t *seg;
seg = &BX_CPU_THIS_PTR sregs[s];
if (seg->cache.valid & SegAccessWOK) {
if ((Is64BitMode() && IsCanonical(offset))
|| (offset < seg->cache.u.segment.limit_scaled)) {
unsigned pl;
accessOK:
laddr = BX_CPU_THIS_PTR get_segment_base(s) + offset;
BX_INSTR_MEM_DATA(BX_CPU_ID, laddr, 2, BX_WRITE);
pl = (CPL==3);
#if BX_SupportGuest2HostTLB
Bit16u *hostAddr = v2h_write_word(laddr, pl);
if (hostAddr) {
// Current write access has privilege.
WriteHostWordToLittleEndian(hostAddr, *data);
return;
}
#endif
access_linear(laddr, 2, pl, BX_WRITE, (void *) data);
return;
}
}
write_virtual_checks(seg, offset, 2);
goto accessOK;
}
void BX_CPP_AttrRegparmN(3)
BX_CPU_C::write_virtual_dword(unsigned s, bx_address offset, Bit32u *data)
{
bx_address laddr;
bx_segment_reg_t *seg;
seg = &BX_CPU_THIS_PTR sregs[s];
if (seg->cache.valid & SegAccessWOK) {
if ((Is64BitMode() && IsCanonical(offset))
|| (offset < (seg->cache.u.segment.limit_scaled-2))) {
unsigned pl;
accessOK:
laddr = BX_CPU_THIS_PTR get_segment_base(s) + offset;
BX_INSTR_MEM_DATA(BX_CPU_ID, laddr, 4, BX_WRITE);
pl = (CPL==3);
#if BX_SupportGuest2HostTLB
Bit32u *hostAddr = v2h_write_dword(laddr, pl);
if (hostAddr) {
// Current write access has privilege.
WriteHostDWordToLittleEndian(hostAddr, *data);
return;
}
#endif
access_linear(laddr, 4, pl, BX_WRITE, (void *) data);
return;
}
}
write_virtual_checks(seg, offset, 4);
goto accessOK;
}
void BX_CPP_AttrRegparmN(3)
BX_CPU_C::write_virtual_qword(unsigned s, bx_address offset, Bit64u *data)
{
bx_address laddr;
bx_segment_reg_t *seg;
seg = &BX_CPU_THIS_PTR sregs[s];
if (seg->cache.valid & SegAccessWOK) {
if ((Is64BitMode() && IsCanonical(offset))
|| (offset <= (seg->cache.u.segment.limit_scaled-7))) {
unsigned pl;
accessOK:
laddr = BX_CPU_THIS_PTR get_segment_base(s) + offset;
BX_INSTR_MEM_DATA(BX_CPU_ID, laddr, 8, BX_WRITE);
pl = (CPL==3);
#if BX_SupportGuest2HostTLB
Bit64u *hostAddr = v2h_write_qword(laddr, pl);
if (hostAddr) {
// Current write access has privilege.
WriteHostQWordToLittleEndian(hostAddr, *data);
return;
}
#endif
access_linear(laddr, 8, pl, BX_WRITE, (void *) data);
return;
}
}
write_virtual_checks(seg, offset, 8);
goto accessOK;
}
void BX_CPP_AttrRegparmN(3)
BX_CPU_C::read_virtual_byte(unsigned s, bx_address offset, Bit8u *data)
{
bx_address laddr;
bx_segment_reg_t *seg;
seg = &BX_CPU_THIS_PTR sregs[s];
if (seg->cache.valid & SegAccessROK) {
if ((Is64BitMode() && IsCanonical(offset))
|| (offset <= seg->cache.u.segment.limit_scaled)) {
unsigned pl;
accessOK:
laddr = BX_CPU_THIS_PTR get_segment_base(s) + offset;
BX_INSTR_MEM_DATA(BX_CPU_ID, laddr, 1, BX_READ);
pl = (CPL==3);
#if BX_SupportGuest2HostTLB
Bit8u *hostAddr = v2h_read_byte(laddr, pl);
if (hostAddr) {
*data = *hostAddr;
return;
}
#endif
access_linear(laddr, 1, pl, BX_READ, (void *) data);
return;
}
}
read_virtual_checks(seg, offset, 1);
goto accessOK;
}
void BX_CPP_AttrRegparmN(3)
BX_CPU_C::read_virtual_word(unsigned s, bx_address offset, Bit16u *data)
{
bx_address laddr;
bx_segment_reg_t *seg;
seg = &BX_CPU_THIS_PTR sregs[s];
if (seg->cache.valid & SegAccessROK) {
if ((Is64BitMode() && IsCanonical(offset))
|| (offset < seg->cache.u.segment.limit_scaled)) {
unsigned pl;
accessOK:
laddr = BX_CPU_THIS_PTR get_segment_base(s) + offset;
BX_INSTR_MEM_DATA(BX_CPU_ID, laddr, 2, BX_READ);
pl = (CPL==3);
#if BX_SupportGuest2HostTLB
Bit16u *hostAddr = v2h_read_word(laddr, pl);
if (hostAddr) {
ReadHostWordFromLittleEndian(hostAddr, *data);
return;
}
#endif
access_linear(laddr, 2, pl, BX_READ, (void *) data);
return;
}
}
read_virtual_checks(seg, offset, 2);
goto accessOK;
}
void BX_CPP_AttrRegparmN(3)
BX_CPU_C::read_virtual_dword(unsigned s, bx_address offset, Bit32u *data)
{
bx_address laddr;
bx_segment_reg_t *seg;
seg = &BX_CPU_THIS_PTR sregs[s];
if (seg->cache.valid & SegAccessROK) {
if ((Is64BitMode() && IsCanonical(offset))
|| (offset < (seg->cache.u.segment.limit_scaled-2))) {
unsigned pl;
accessOK:
laddr = BX_CPU_THIS_PTR get_segment_base(s) + offset;
BX_INSTR_MEM_DATA(BX_CPU_ID, laddr, 4, BX_READ);
pl = (CPL==3);
#if BX_SupportGuest2HostTLB
Bit32u *hostAddr = v2h_read_dword(laddr, pl);
if (hostAddr) {
ReadHostDWordFromLittleEndian(hostAddr, *data);
return;
}
#endif
access_linear(laddr, 4, pl, BX_READ, (void *) data);
return;
}
}
read_virtual_checks(seg, offset, 4);
goto accessOK;
}
void BX_CPP_AttrRegparmN(3)
BX_CPU_C::read_virtual_qword(unsigned s, bx_address offset, Bit64u *data)
{
bx_address laddr;
bx_segment_reg_t *seg;
seg = &BX_CPU_THIS_PTR sregs[s];
if (seg->cache.valid & SegAccessROK) {
if ((Is64BitMode() && IsCanonical(offset))
|| (offset <= (seg->cache.u.segment.limit_scaled-7))) {
unsigned pl;
accessOK:
laddr = BX_CPU_THIS_PTR get_segment_base(s) + offset;
BX_INSTR_MEM_DATA(BX_CPU_ID, laddr, 8, BX_READ);
pl = (CPL==3);
#if BX_SupportGuest2HostTLB
Bit64u *hostAddr = v2h_read_qword(laddr, pl);
if (hostAddr) {
ReadHostQWordFromLittleEndian(hostAddr, *data);
return;
}
#endif
access_linear(laddr, 8, pl, BX_READ, (void *) data);
return;
}
}
read_virtual_checks(seg, offset, 8);
goto accessOK;
}
//////////////////////////////////////////////////////////////
// special Read-Modify-Write operations //
// address translation info is kept across read/write calls //
//////////////////////////////////////////////////////////////
void BX_CPP_AttrRegparmN(3)
BX_CPU_C::read_RMW_virtual_byte(unsigned s, bx_address offset, Bit8u *data)
{
bx_address laddr;
bx_segment_reg_t *seg;
seg = &BX_CPU_THIS_PTR sregs[s];
if (seg->cache.valid & SegAccessWOK) {
if ((Is64BitMode() && IsCanonical(offset))
|| (offset <= seg->cache.u.segment.limit_scaled)) {
unsigned pl;
accessOK:
laddr = BX_CPU_THIS_PTR get_segment_base(s) + offset;
BX_INSTR_MEM_DATA(BX_CPU_ID, laddr, 1, BX_RW);
pl = (CPL==3);
#if BX_SupportGuest2HostTLB
Bit8u *hostAddr = v2h_write_byte(laddr, pl);
if (hostAddr) {
// Current write access has privilege.
*data = *hostAddr;
BX_CPU_THIS_PTR address_xlation.pages = (bx_ptr_equiv_t) hostAddr;
return;
}
#endif
// Accelerated attempt falls through to long path. Do it the
// old fashioned way...
access_linear(laddr, 1, pl, BX_RW, (void *) data);
return;
}
}
write_virtual_checks(seg, offset, 1);
goto accessOK;
}
void BX_CPP_AttrRegparmN(3)
BX_CPU_C::read_RMW_virtual_word(unsigned s, bx_address offset, Bit16u *data)
{
bx_address laddr;
bx_segment_reg_t *seg;
seg = &BX_CPU_THIS_PTR sregs[s];
if (seg->cache.valid & SegAccessWOK) {
if ((Is64BitMode() && IsCanonical(offset))
|| (offset < seg->cache.u.segment.limit_scaled)) {
unsigned pl;
accessOK:
laddr = BX_CPU_THIS_PTR get_segment_base(s) + offset;
BX_INSTR_MEM_DATA(BX_CPU_ID, laddr, 2, BX_RW);
pl = (CPL==3);
#if BX_SupportGuest2HostTLB
Bit16u *hostAddr = v2h_write_word(laddr, pl);
if (hostAddr) {
// Current write access has privilege.
ReadHostWordFromLittleEndian(hostAddr, *data);
BX_CPU_THIS_PTR address_xlation.pages = (bx_ptr_equiv_t) hostAddr;
return;
}
#endif
access_linear(laddr, 2, pl, BX_RW, (void *) data);
return;
}
}
write_virtual_checks(seg, offset, 2);
goto accessOK;
}
void BX_CPP_AttrRegparmN(3)
BX_CPU_C::read_RMW_virtual_dword(unsigned s, bx_address offset, Bit32u *data)
{
bx_address laddr;
bx_segment_reg_t *seg;
seg = &BX_CPU_THIS_PTR sregs[s];
if (seg->cache.valid & SegAccessWOK) {
if ((Is64BitMode() && IsCanonical(offset))
|| (offset < (seg->cache.u.segment.limit_scaled-2))) {
unsigned pl;
accessOK:
laddr = BX_CPU_THIS_PTR get_segment_base(s) + offset;
BX_INSTR_MEM_DATA(BX_CPU_ID, laddr, 4, BX_RW);
pl = (CPL==3);
#if BX_SupportGuest2HostTLB
Bit32u *hostAddr = v2h_write_dword(laddr, pl);
if (hostAddr) {
// Current write access has privilege.
ReadHostDWordFromLittleEndian(hostAddr, *data);
BX_CPU_THIS_PTR address_xlation.pages = (bx_ptr_equiv_t) hostAddr;
return;
}
#endif
access_linear(laddr, 4, pl, BX_RW, (void *) data);
return;
}
}
write_virtual_checks(seg, offset, 4);
goto accessOK;
}
void BX_CPP_AttrRegparmN(3)
BX_CPU_C::read_RMW_virtual_qword(unsigned s, bx_address offset, Bit64u *data)
{
bx_address laddr;
bx_segment_reg_t *seg;
seg = &BX_CPU_THIS_PTR sregs[s];
if (seg->cache.valid & SegAccessWOK) {
if ((Is64BitMode() && IsCanonical(offset))
|| (offset <= (seg->cache.u.segment.limit_scaled-7))) {
unsigned pl;
accessOK:
laddr = BX_CPU_THIS_PTR get_segment_base(s) + offset;
BX_INSTR_MEM_DATA(BX_CPU_ID, laddr, 8, BX_RW);
pl = (CPL==3);
#if BX_SupportGuest2HostTLB
Bit64u *hostAddr = v2h_write_qword(laddr, pl);
if (hostAddr) {
// Current write access has privilege.
ReadHostQWordFromLittleEndian(hostAddr, *data);
BX_CPU_THIS_PTR address_xlation.pages = (bx_ptr_equiv_t) hostAddr;
return;
}
#endif
access_linear(laddr, 8, pl, BX_RW, (void *) data);
return;
}
}
write_virtual_checks(seg, offset, 8);
goto accessOK;
}
void BX_CPP_AttrRegparmN(1)
BX_CPU_C::write_RMW_virtual_byte(Bit8u val8)
{
if (BX_CPU_THIS_PTR address_xlation.pages > 2) {
// Pages > 2 means it stores a host address for direct access.
Bit8u *hostAddr = (Bit8u *) BX_CPU_THIS_PTR address_xlation.pages;
*hostAddr = val8;
}
else {
// address_xlation.pages must be 1
BX_CPU_THIS_PTR mem->writePhysicalPage(BX_CPU_THIS,
BX_CPU_THIS_PTR address_xlation.paddress1, 1, &val8);
}
}
void BX_CPP_AttrRegparmN(1)
BX_CPU_C::write_RMW_virtual_word(Bit16u val16)
{
if (BX_CPU_THIS_PTR address_xlation.pages > 2) {
// Pages > 2 means it stores a host address for direct access.
Bit16u *hostAddr = (Bit16u *) BX_CPU_THIS_PTR address_xlation.pages;
WriteHostWordToLittleEndian(hostAddr, val16);
}
else if (BX_CPU_THIS_PTR address_xlation.pages == 1) {
BX_CPU_THIS_PTR mem->writePhysicalPage(BX_CPU_THIS,
BX_CPU_THIS_PTR address_xlation.paddress1, 2, &val16);
}
else {
#ifdef BX_LITTLE_ENDIAN
BX_CPU_THIS_PTR mem->writePhysicalPage(BX_CPU_THIS,
BX_CPU_THIS_PTR address_xlation.paddress1, 1, &val16);
BX_CPU_THIS_PTR mem->writePhysicalPage(BX_CPU_THIS,
BX_CPU_THIS_PTR address_xlation.paddress2, 1, ((Bit8u *) &val16) + 1);
#else
BX_CPU_THIS_PTR mem->writePhysicalPage(BX_CPU_THIS,
BX_CPU_THIS_PTR address_xlation.paddress1, 1, ((Bit8u *) &val16) + 1);
BX_CPU_THIS_PTR mem->writePhysicalPage(BX_CPU_THIS,
BX_CPU_THIS_PTR address_xlation.paddress2, 1, &val16);
#endif
}
}
void BX_CPP_AttrRegparmN(1)
BX_CPU_C::write_RMW_virtual_dword(Bit32u val32)
{
if (BX_CPU_THIS_PTR address_xlation.pages > 2) {
// Pages > 2 means it stores a host address for direct access.
Bit32u *hostAddr = (Bit32u *) BX_CPU_THIS_PTR address_xlation.pages;
WriteHostDWordToLittleEndian(hostAddr, val32);
}
else if (BX_CPU_THIS_PTR address_xlation.pages == 1) {
BX_CPU_THIS_PTR mem->writePhysicalPage(BX_CPU_THIS,
BX_CPU_THIS_PTR address_xlation.paddress1, 4, &val32);
}
else {
#ifdef BX_LITTLE_ENDIAN
BX_CPU_THIS_PTR mem->writePhysicalPage(BX_CPU_THIS,
BX_CPU_THIS_PTR address_xlation.paddress1,
BX_CPU_THIS_PTR address_xlation.len1,
&val32);
BX_CPU_THIS_PTR mem->writePhysicalPage(BX_CPU_THIS,
BX_CPU_THIS_PTR address_xlation.paddress2,
BX_CPU_THIS_PTR address_xlation.len2,
((Bit8u *) &val32) + BX_CPU_THIS_PTR address_xlation.len1);
#else
BX_CPU_THIS_PTR mem->writePhysicalPage(BX_CPU_THIS,
BX_CPU_THIS_PTR address_xlation.paddress1,
BX_CPU_THIS_PTR address_xlation.len1,
((Bit8u *) &val32) + (4 - BX_CPU_THIS_PTR address_xlation.len1));
BX_CPU_THIS_PTR mem->writePhysicalPage(BX_CPU_THIS,
BX_CPU_THIS_PTR address_xlation.paddress2,
BX_CPU_THIS_PTR address_xlation.len2,
&val32);
#endif
}
}
void BX_CPP_AttrRegparmN(1)
BX_CPU_C::write_RMW_virtual_qword(Bit64u val64)
{
if (BX_CPU_THIS_PTR address_xlation.pages > 2) {
// Pages > 2 means it stores a host address for direct access.
Bit64u *hostAddr = (Bit64u *) BX_CPU_THIS_PTR address_xlation.pages;
WriteHostQWordToLittleEndian(hostAddr, val64);
}
else if (BX_CPU_THIS_PTR address_xlation.pages == 1) {
BX_CPU_THIS_PTR mem->writePhysicalPage(BX_CPU_THIS,
BX_CPU_THIS_PTR address_xlation.paddress1, 8, &val64);
}
else {
#ifdef BX_LITTLE_ENDIAN
BX_CPU_THIS_PTR mem->writePhysicalPage(BX_CPU_THIS,
BX_CPU_THIS_PTR address_xlation.paddress1,
BX_CPU_THIS_PTR address_xlation.len1,
&val64);
BX_CPU_THIS_PTR mem->writePhysicalPage(BX_CPU_THIS,
BX_CPU_THIS_PTR address_xlation.paddress2,
BX_CPU_THIS_PTR address_xlation.len2,
((Bit8u *) &val64) + BX_CPU_THIS_PTR address_xlation.len1);
#else
BX_CPU_THIS_PTR mem->writePhysicalPage(BX_CPU_THIS,
BX_CPU_THIS_PTR address_xlation.paddress1,
BX_CPU_THIS_PTR address_xlation.len1,
((Bit8u *) &val64) + (8 - BX_CPU_THIS_PTR address_xlation.len1));
BX_CPU_THIS_PTR mem->writePhysicalPage(BX_CPU_THIS,
BX_CPU_THIS_PTR address_xlation.paddress2,
BX_CPU_THIS_PTR address_xlation.len2,
&val64);
#endif
}
}
//
// Some macro defs to make things cleaner for endian-ness issues.
// The following routines access a double qword, ie 16-bytes.
// For the moment, I redirect these to use the single qword routines
// by splitting one access into two.
//
// Endian Host byte order Guest (x86) byte order
// ======================================================
// Little 0..7 8..15 0..7 8..15
// Big 15..8 7...0 0..7 8..15
//
// Below are the host memory offsets to each of 2 single quadwords, which
// are different across big an little endian machines. The memory
// accessing routines take care of the access endian issues when accessing
// the physical memory image.
//
#ifdef BX_LITTLE_ENDIAN
# define Host1stDWordOffset 0
# define Host2ndDWordOffset 8
#else
# define Host1stDWordOffset 8
# define Host2ndDWordOffset 0
#endif
void BX_CPP_AttrRegparmN(3)
BX_CPU_C::read_virtual_dqword(unsigned s, bx_address offset, Bit8u *data)
{
// Read Double Quadword.
Bit64u *qwords = (Bit64u*) data;
read_virtual_qword(s, offset+Host1stDWordOffset, &qwords[0]);
read_virtual_qword(s, offset+Host2ndDWordOffset, &qwords[1]);
}
void BX_CPP_AttrRegparmN(3)
BX_CPU_C::read_virtual_dqword_aligned(unsigned s, bx_address offset, Bit8u *data)
{
// If double quadword access is unaligned, #GP(0).
if (offset & 0xf) {
BX_DEBUG(("read_virtual_dqword_aligned: access not aligned to 16-byte"));
exception(BX_GP_EXCEPTION, 0, 0);
}
read_virtual_dqword(s, offset, data);
}
void BX_CPP_AttrRegparmN(3)
BX_CPU_C::write_virtual_dqword(unsigned s, bx_address offset, Bit8u *data)
{
// Write Double Quadword.
Bit64u *qwords = (Bit64u*) data;
write_virtual_qword(s, offset+Host1stDWordOffset, &qwords[0]);
write_virtual_qword(s, offset+Host2ndDWordOffset, &qwords[1]);
}
void BX_CPP_AttrRegparmN(3)
BX_CPU_C::write_virtual_dqword_aligned(unsigned s, bx_address offset, Bit8u *data)
{
// If double quadword access is unaligned, #GP(0).
if (offset & 0xf) {
BX_DEBUG(("write_virtual_dqword_aligned: access not aligned to 16-byte"));
exception(BX_GP_EXCEPTION, 0, 0);
}
write_virtual_dqword(s, offset, data);
}
#if BX_SUPPORT_FPU
void BX_CPP_AttrRegparmN(3)
BX_CPU_C::read_virtual_tword(unsigned s, bx_address offset, floatx80 *data)
{
// read floating point register
read_virtual_qword(s, offset+0, &data->fraction);
read_virtual_word (s, offset+8, &data->exp);
}
void BX_CPP_AttrRegparmN(3)
BX_CPU_C::write_virtual_tword(unsigned s, bx_address offset, floatx80 *data)
{
// store floating point register
write_virtual_qword(s, offset+0, &data->fraction);
write_virtual_word (s, offset+8, &data->exp);
}
#endif
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