🚀 go-pugleaf

In article <Bz3pp5.AAw@bailgate.gpsemi.com> lee_b@sn4901.oldham.gpsemi.com (Lee Burley) writes:
>Are the SC:IP pair pushed onto the stack after an interrupt??
>
>if so then
>
>  POP AX
>  MOV AX, {cs store}
>  POP BX
>  MOV BX, {ip store}
>  PUSH BX
>  PUSH AX
>
>might work??
>
>PS I might have got the mnemonics a bit wrong, it has been a long time
>since I did any assembler on the 80X86!!

If I'm right, the top of the stack will look like this after an interrupt:

	+----+
	| IP |
	+----+
	| CS |
	+----+
	| SR | Read Flags-register
	+----+
	| .. |

Near Call will push IP
Far call will push CS, IP
Interrupt will push Flags, CS, IP

RTI will pop IP, CS, Flags
Far Ret will pop IP, CS
Near Ret will pop IP

An assembler I know actually emulated Far call by PUSH CS, NEAR CALL. It works.

---------------------------------------------------------------------------
wiltinkm@dutiws.twi.tudelft.nl
Maarten Wiltink

Department of Applied Mathematics and Computer Science
Delft University of Technology
The Netherlands