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Check for seg cache valid bit in real mode as well - fix for big real mode

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Stanislav Shwartsman 2008-05-01 05:11:19 +00:00
parent 81deffd65d
commit 8e8fa363f1
1 changed files with 16 additions and 1 deletions
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17
bochs/cpu/access.cc
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@ -1,5 +1,5 @@
/////////////////////////////////////////////////////////////////////////
// $Id: access.cc,v 1.101 2008-04-27 19:48:57 sshwarts Exp $
// $Id: access.cc,v 1.102 2008-05-01 05:11:19 sshwarts Exp $
/////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2001 MandrakeSoft S.A.
@ -121,6 +121,11 @@ BX_CPU_C::write_virtual_checks(bx_segment_reg_t *seg, bx_address offset, unsigne
return;
}
else { /* real mode */
if (seg->cache.valid==0) {
BX_DEBUG(("write_virtual_checks(): segment descriptor not valid (real mode)"));
exception(int_number(seg), 0, 0);
}
if (offset > (seg->cache.u.segment.limit_scaled - length + 1)
|| (length-1 > seg->cache.u.segment.limit_scaled))
{
@ -211,6 +216,11 @@ BX_CPU_C::read_virtual_checks(bx_segment_reg_t *seg, bx_address offset, unsigned
return;
}
else { /* real mode */
if (seg->cache.valid==0) {
BX_DEBUG(("read_virtual_checks(): segment descriptor not valid (real mode)"));
exception(int_number(seg), 0, 0);
}
if (offset > (seg->cache.u.segment.limit_scaled - length + 1)
|| (length-1 > seg->cache.u.segment.limit_scaled))
{
@ -305,6 +315,11 @@ BX_CPU_C::execute_virtual_checks(bx_segment_reg_t *seg, bx_address offset, unsig
return;
}
else { /* real mode */
if (seg->cache.valid==0) {
BX_DEBUG(("execute_virtual_checks(): segment descriptor not valid (real mode)"));
exception(int_number(seg), 0, 0);
}
if (offset > (seg->cache.u.segment.limit_scaled - length + 1)
|| (length-1 > seg->cache.u.segment.limit_scaled))
{