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Start stuff with an REFT instead of IRET. Fixes CyberRace.(Beta 2)

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@3260
This commit is contained in:
Peter Veenstra 2009-01-14 22:16:00 +00:00
parent 4e8f79fd9e
commit f47d48ba07
4 changed files with 33 additions and 12 deletions
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14
src/cpu/callback.cpp
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@ -16,7 +16,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* $Id: callback.cpp,v 1.37 2007-06-03 16:46:33 c2woody Exp $ */
/* $Id: callback.cpp,v 1.38 2009-01-14 22:16:00 qbix79 Exp $ */
#include <stdlib.h>
#include <string.h>
@ -403,6 +403,18 @@ Bitu CALLBACK_SetupExtra(Bitu callback, Bitu type, PhysPt physAddress, bool use_
phys_writeb(physAddress+0x0d,(Bit8u)0x1f); // pop ds
phys_writeb(physAddress+0x0e,(Bit8u)0xcf); //An IRET Instruction
return 0x0f; */
case CB_INT21:
phys_writeb(physAddress+0x00,(Bit8u)0xFB); //STI
if (use_cb) {
phys_writeb(physAddress+0x01,(Bit8u)0xFE); //GRP 4
phys_writeb(physAddress+0x02,(Bit8u)0x38); //Extra Callback instruction
phys_writew(physAddress+0x03, callback); //The immediate word
physAddress+=4;
}
phys_writeb(physAddress+0x01,(Bit8u)0xCF); //An IRET Instruction
phys_writeb(physAddress+0x02,(Bit8u)0xCB); //A RETF Instruction
return (use_cb?7:3);
default:
E_Exit("CALLBACK:Setup:Illegal type %d",type);
}