Assembly Language Tutorials for Windows - 04 Data Transfers Part-3
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This document discusses jump and loop instructions in assembly language. It explains that JMP is an unconditional jump instruction that transfers execution to the specified destination. A JMP instruction can create an infinite loop by jumping back to its own location. LOOP is a loop instruction that decrements the ECX register and jumps back to the destination label if ECX is not zero, allowing code to repeat. The document provides a demo example using MOV to initialize ECX as the loop counter, and LOOP to repeat the block incrementing EAX until ECX reaches zero.
Assembly Language Tutorials for Windows - 04 Data Transfers Part-3
- 1. DATA TRANSFERS IN ASSEMBLY SANGRAM KESARI RAY <SHANKAR.RAY030@GMAIL.COM>
- 2. JMP AND LOOP INSTRUCTIONS • JMP //UN-CONDITIONAL JUMP, WE’LL DEAL WITH OTHER TYPES OF JUMPS LATER • JMP DEST • HERE: • . • . • JMP HERE //INFINITE LOOP • LOOP • LOOP DEST //THE DEST MUST BE WITHIN -127 TO +128 BYTES OF THE CURRENT LOCATION COUNTER • ECX REGISTER IS USED AS INTERNAL LOOP COUNTER • MOV ECX, 10 • HERE: • INC EAX • LOOP HERE