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better compatibility while in v86-mode (Strike Commander etc.)

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@2228
This commit is contained in:
Sebastian Strohhäcker 2005-07-04 20:20:19 +00:00
parent 352640d5a9
commit 0e0f294202
4 changed files with 57 additions and 20 deletions
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11
src/dos/dos_execute.cpp
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@ -16,7 +16,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* $Id: dos_execute.cpp,v 1.45 2005-02-10 10:20:51 qbix79 Exp $ */
/* $Id: dos_execute.cpp,v 1.46 2005-07-04 20:20:19 c2woody Exp $ */
#include <string.h>
#include <ctype.h>
@ -131,7 +131,7 @@ 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+4,0x200); //stack isn't preserved
mem_writew(SegPhys(ss)+reg_sp+4,reg_flags&(~FLAG_CF));
// Free memory owned by process
if (!tsr) DOS_FreeProcessMemory(mempsp);
DOS_UpdatePSPName();
@ -376,10 +376,13 @@ bool DOS_Execute(char * name,PhysPt block_pt,Bit8u flags) {
reg_sp-=6;
mem_writew(SegPhys(ss)+reg_sp+0,RealOff(csip));
mem_writew(SegPhys(ss)+reg_sp+2,RealSeg(csip));
mem_writew(SegPhys(ss)+reg_sp+4,0x200);
/* 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));
/* Setup the rest of the registers */
reg_ax=0;reg_si=0x100;
reg_cx=reg_dx=reg_bx=reg_di=reg_bp=0;
reg_cx=reg_dx=reg_bx=reg_di=0;
reg_bp=0x91c; /* DOS internal stack begin relict */
SegSet16(ds,pspseg);SegSet16(es,pspseg);
#if C_DEBUG
/* Started from debug.com, then set breakpoint at start */