Assembly Language Lecture 3
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Assembly Language Lecture 3
![Instruction Execution and Addressing ,[object Object],[object Object],Motaz K. Saad, Dept. of CS](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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Assembly Language Lecture 3
- 1. Assembly Language Fundamentals of Assembly language Motaz K. Saad Spring 2007 Motaz K. Saad, Dept. of CS
- 3. 26AE CS 0044 IP Instruction address = ??????? Motaz K. Saad, Dept. of CS
- 4. 26AE CS 0044 IP Instruction address = 26AE0 + 0044 _______________________ 26B24 25BD DS A03F00 26B24 Data address=?????? Motaz K. Saad, Dept. of CS
- 5. 26AE CS 0044 IP Data address = 25BD0 + 003F _______________________ 25C0F 25BD DS Motaz K. Saad, Dept. of CS
- 8. ; <your comments> ; Add two numbers and store the results into the third variable TITLE A04ASM1 (EXE) Move and add operations ; --------------------------------------------- .STACK ; ---------------------------------------------- .DATA FLDD DW 215 FLDE DW 125 FLDF DW ? ; ----------------------------------------------- .CODE MAIN PROC MOV AX,@DATA ;Set address of data MOV DS,AX ; segment in DS MOV AX,FLDD ;Move 0215 to AX ADD AX,FLDE ;Add 0125 to AX MOV FLDF,AX ;Store sum in FLDF MOV AX,4C00H ;End processing INT 21H MAIN ENDP ;End of procedure END MAIN ;End of program Comments COMMENTS Motaz K. Saad, Dept. of CS
- 9. ; Add two numbers and store the results into the third variable TITLE A04ASM1 (EXE) Move and add operations ; --------------------------------------------- .STACK ; ---------------------------------------------- .DATA FLDD DW 0215H FLDE DW 0125H FLDF DW ? ; ----------------------------------------------- .CODE MAIN PROC MOV @DATA ;Set address of data MOV DS,AX ;Segment in DS MOV AX,FLDD ;Move 0215 to AX ADD AX,FLDE ;Add 0125 to AX MOV FLDF,AX ;Store sum in FLDF MOV AX,4C00H ;End processing INT 21H MAIN ENDP ;End of procedure END MAIN ;End of program IDENTIFIERS Motaz K. Saad, Dept. of CS
- 14. ; Add two numbers and store the results into the third variable page 60,132 TITLE A04ASM1 (EXE) Move and add operations ; --------------------------------------------- .STACK ; ---------------------------------------------- .DATA FLDD DW 215 FLDE DW 125 FLDF DW ? ; ----------------------------------------------- .CODE MAIN PROC MOV AX,@DATA ;Set address of data MOV DS,AX ;Segment in DS MOV AX,FLDD ;Move 0215 to AX ADD AX,FLDE ;Add 0125 to AX MOV FLDF,AX ;Store sum in FLDF MOV AX,4C00H ;End processing INT 21H MAIN ENDP ;End of procedure END MAIN ;End of program STATEMENTS Motaz K. Saad, Dept. of CS
- 16. ; Add two numbers and store the results into the third variable page 60,132 page [length(10-255)],[width(60-132)] TITLE A04ASM1 (EXE) Move and add operations ; --------------------------------------------- .STACK ; ---------------------------------------------- .DATA FLDD DW 215 FLDE DW 125 FLDF DW ? ; ----------------------------------------------- .CODE MAIN PROC MOV AX,@DATA ;Set address of data MOV DS,AX ;Segment in DS MOV AX,FLDD ;Move 0215 to AX ADD AX,FLDE ;Add 0125 to AX MOV FLDF,AX ;Store sum in FLDF MOV AX,4C00H ;End processing INT 21H MAIN ENDP ;End of procedure END MAIN ;End of program Page directive Motaz K. Saad, Dept. of CS
- 17. ; Add two numbers and store the results into the third variable page 10,70 TITLE A04ASM1 (EXE) Move and add operations ; --------------------------------------------- .STACK ; ---------------------------------------------- .DATA FLDD DW 215 FLDE DW 125 FLDF DW ? ; ----------------------------------------------- .CODE MAIN PROC MOV AX,@DATA ;Set address of data MOV DS,AX ;Segment in DS MOV AX,FLDD ;Move 0215 to AX ADD AX,FLDE ;Add 0125 to AX MOV FLDF,AX ;Store sum in FLDF MOV AX,4C00H ;End processing INT 21H MAIN ENDP ;End of procedure END MAIN ;End of program Page directive Motaz K. Saad, Dept. of CS
- 18. Title directive Motaz K. Saad, Dept. of CS ; Add two numbers and store the results into the third variable page 10,70 TITLE A04ASM1 (EXE) Move and add operations ; --------------------------------------------- .STACK ; ---------------------------------------------- .DATA FLDD DW 215 FLDE DW 125 FLDF DW ? ; ----------------------------------------------- .CODE MAIN PROC MOV AX,@DATA ;Set address of data MOV DS,AX ;Segment in DS MOV AX,FLDD ;Move 0215 to AX ADD AX,FLDE ;Add 0125 to AX MOV FLDF,AX ;Store sum in FLDF MOV AX,4C00H ;End processing INT 21H MAIN ENDP ;End of procedure END MAIN ;End of program
- 19. ; Add two numbers and store the results into the third variable page 60,132 TITLE A04ASM1 (EXE) Move and add operations ; --------------------------------------------- .STACK ; ---------------------------------------------- .DATA FLDD DW 215 FLDE DW 125 FLDF DW ? ; ----------------------------------------------- .CODE MAIN PROC MOV AX,@DATA ;Set address of data MOV FLDF,AX ;Store sum in FLDF MOV AX,4C00H ;End processing INT 21H MAIN ENDP ;End of procedure END MAIN ;End of program Segment directive Motaz K. Saad, Dept. of CS
- 20. ; Add two numbers and store the results into the third variable page 60,132 TITLE A04ASM1 (EXE) Move and add operations ; --------------------------------------------- .STACK ; ---------------------------------------------- .DATA FLDD DW 215 FLDE DW 125 FLDF DW ? ; ----------------------------------------------- .CODE MAIN PROC MOV AX,@DATA ;Set address of data MOV DS,AX ;Segment in DS MOV AX,FLDD ;Move 0215 to AX MOV FLDF,AX ;Store sum in FLDF MOV AX,4C00H ;End processing INT 21H MAIN ENDP ; End of procedure END MAIN ;End of program PROC directive Motaz K. Saad, Dept. of CS