valter/dosbox-staging
1
0
Fork 0
Code Releases Activity

better compatibility of the flags after dos exec/terminate (updated Ultima3)

Browse source 
Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@2348
This commit is contained in:
Sebastian Strohhäcker 2005-10-17 20:17:08 +00:00
parent 267d3c2539
commit 9d1cf58132
1 changed files with 7 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

11
src/dos/dos_execute.cpp
View file

@ -16,7 +16,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* $Id: dos_execute.cpp,v 1.50 2005-10-07 15:16:58 c2woody Exp $ */
/* $Id: dos_execute.cpp,v 1.51 2005-10-17 20:17:08 c2woody Exp $ */
#include <string.h>
#include <ctype.h>
@ -131,7 +131,9 @@ bool DOS_Terminate(bool tsr) {
/* Set the CS:IP stored in int 0x22 back on the stack */
mem_writew(SegPhys(ss)+reg_sp+0,RealOff(old22));
mem_writew(SegPhys(ss)+reg_sp+2,RealSeg(old22));
mem_writew(SegPhys(ss)+reg_sp+4,reg_flags&(~FLAG_CF));
/* set IOPL=3 (Strike Commander), nested task set,
interrupts enabled, test flags cleared */
mem_writew(SegPhys(ss)+reg_sp+4,0x7202);
// Free memory owned by process
if (!tsr) DOS_FreeProcessMemory(mempsp);
DOS_UpdatePSPName();
@ -395,8 +397,9 @@ bool DOS_Execute(char * name,PhysPt block_pt,Bit8u flags) {
mem_writew(SegPhys(ss)+reg_sp+0,RealOff(csip));
mem_writew(SegPhys(ss)+reg_sp+2,RealSeg(csip));
/* DOS starts programs with a RETF, so our IRET
should not modify the flags (e.g. IOPL in v86 mode) */
mem_writew(SegPhys(ss)+reg_sp+4,reg_flags&(~FLAG_CF));
should not modify critical flags (IOPL in v86 mode);
interrupt flag is set explicitly, test flags cleared */
mem_writew(SegPhys(ss)+reg_sp+4,(reg_flags&(~FMASK_TEST))|FLAG_IF);
/* Setup the rest of the registers */
reg_ax=reg_bx=0;reg_cx=0xff;
reg_dx=pspseg;