Please title this page. (chnkaddr.htm)

			return - Address Offset
			AX (CL in danger)	CX (AX in danger)	XX (CL, AX in danger)
parm Chunk Pointer	AL	entry	;Preserve CL PUSH CX MOV CL,AL	;Preserve AH MOV CX,AX	;Preserve CL,AH XCHG CX,XX MOV CX,AX
	AL	exit	POP CX	XCHG AX,XX	XCHG AX,XX XCHG AX,CX
	AH	entry	;Preserve CL XCHG AL,AH PUSH CX MOV CL,AL	;Preserve AL XCHG AL,AH MOV CX,AX	;Preserve CL,AH XCHG AL,AH XCHG CX,XX MOV CX,AX
	AH	exit	POP CX	XCHG AX,XX XCHG AL,AH	XCHG AX,XX XCHG AX,CX XCHG AL,AH
	CL	entry	;Ideal call MOV AL,CL	;Preserve AX PUSH AX MOV AL,CL	;Preserve AX XCHG AX,XX MOV AL,CL
	CL	exit		XCHG AX,XX POP AX	XCHG AX,XX
	CH	entry	;Preserve CL XCHG CH,CL MOV AL,CL	;Preserve AX PUSH AX XCHG CH,CL MOV AL,CL	;Preserve CL,AX XCHG AX,XX XCHG CL,CH MOV AL,CL
	CH	exit	XCHG CH,CL	XCHG AX,XX POP AX	XCHG AX,XX XCHG CL,CH
	XX	entry	;Preserve CL XCHG XX,CL MOV AL,CL	;Preserve AX PUSH AX XCHG XX,CL MOV AL,CL	;Preserve CL,AX XCHG AX,XX XCHG CL,XX MOV AL,CL
	XX	exit	XCHG XX,CL	XCHG AX,XX POP AX	XCHG AX,XX XCHG CL,XX

cp2oset	MACRO		;Preferably chunk pointer in cl and returns result in ax or any other 16 bit reg or var

	##IF '#1' EQ 'AH'
	XCHG AL,AH
	##ENDIF

	##IF '#1' EQ 'AH' OR '#1' EQ 'AL'
	 ##IF '#2' EQ 'AX' ;AH (now in AL) or AL to AX: Preserve all of CX and destination not available so must use stack
	  PUSH CX
	  MOV CL,AL
	 ##ELSE 
	  ##IF '#2' NE 'CX' ;AH (now in AL) or AL to anything but AX or CX: use eventual destination to save CX
	   XCHG CX,#2
	   ##ENDIF
	  ;AH (now in AL) or AL to anything but AX: Get #1 into CL and use CH to save AH or AL (now in AH)
	  MOV CX,AX 
	  ##ENDIF
	##ELSE ;not AH or AL
	 ##IF '#2' EQ 'CX'
	  PUSH AX ;not AH or AL to CX: Preserve all of AX and destination not available so must use stack
	 ##ELSE
	  ##IF '#2' NE 'AX';not AH or AL and not AX or CX
	   XCHG AX, #2
	   ##ENDIF
	  ##ENDIF
	 ##IF '#1' NE 'CL' ;not AH, AL or CL
	  XCHG CL,#1
	  ##ENDIF
	 MOV AL,CL
	 ##ENDIF

	XOR AH,AH
	AND CL,03
	SHL AX,CL
	SHL AX,CL
	ADD AL,CL
	ADC AX,0
	INC AX
	
	##IF '#2' EQ 'AX'
	 ##IF '#1' EQ 'AL' OR '#1' EQ 'AH'
	  POP CX
	 ##ELSE ; not AL or AH
	  ##IF '#1' NE 'CL'
	   XCHG #1,CL
	   ##ENDIF
	  ##ENDIF
	##ELSE ; not AX
	 XCHG AX,#2
	 ##IF '#2' EQ 'CX'
	  ##IF '#1' EQ 'AL' OR '#1' EQ 'AH'
	  ##ELSE
	   POP AX
	   ##ENDIF
	 ##ELSE ; not AX or CX
	  ##IF '#1' EQ 'AL' OR '#1' EQ 'AH'
	   XCHG AX,CX
	  ##ELSE ; not AX or CX and not AL or AH
	   ##IF '#1' NE 'CL'
	    XCHG #1,CL
	    ##ENDIF
	   ##ENDIF
	  ##ENDIF
	 ; not AX
	 ##IF '#1' EQ 'AH'
	  XCHG AL,AH
	  ##ENDIF
	 ##ENDIF

file: /Techref/language/meta-l/chnkaddr.htm, 5KB, , updated: 1999/5/28 08:23, local time: 2024/11/22 16:41,

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