1 / 8

Assembly Programming

Assembly Programming. Notes for Practical 3 Munaf Sheikh http://www.cs.uwc.ac.za/~msheikh/COS365Assembler. Jump statements. Simplest form of Jump statement “jmp Lable” Equivalent to GOTO Simply says: Jump to Label. Equality Comparison. CMP leftOp, rightOP

zeal
Télécharger la présentation

Assembly Programming

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Assembly Programming Notes for Practical 3 Munaf Sheikh http://www.cs.uwc.ac.za/~msheikh/COS365Assembler

  2. Jump statements • Simplest form of Jump statement • “jmp Lable” • Equivalent to GOTO • Simply says: Jump to Label

  3. Equality Comparison • CMP leftOp, rightOP • Compares the leftOperand to the rightOperand • Jumps based on Equality: • JE (jump if equal) • JNE (jump if not equal) • JCXZ (jump if CX = 0) • JECXZ (jump if ECX = 0)

  4. More Equality jumps • JG (jump if greater) • JNLE (jump if not less than or equal to) • JGE (jump if greater or equal) • JNL (jump if not le) • JL (jump if less) • Etc..: JNGE, JLE, JNG

  5. start TRUE FALSE expression Statement List 1 Statement list 2 end IF ELSE’s If (Expression) Statement List 1 Else Statement List 2

  6. IF ELSE’s Initial code here Cmp op1 op2 Je L1 If (OP1 == OP2){ X = 1; Y = 2; } Else { Z = 1; } L1: Mov X,1 Mov Y,2 Jmp L3 L2: Mov Z, 1 Jmp L3 L3:

  7. start Expression FALSE TRUE Statement List End While Loops While (Expression) Statement List

  8. Prac 3 • Write an Assembly Program that: • prompts the user for a System Administrator pin (PIN). • prompts the user for an Iteration Limit (LIMIT). • prints "---THE SYSTEM IS NOW RUNNING---" • Loop until counter = LIMIT • prompt user for pin • if pin == PIN, jump to CORRECTPIN handling code • else print error message and increment counter • jump back to beginning of loop. Save as access.asm

More Related