Answered: This is a MASM Project Assembly Code…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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This is a MASM Project Assembly Code for x86 Processors !

The code below is supposed to copy whatever's in the source variable into the target variable. However, there is a single error, which will cause it to work correctly if fixed. What is it?

.data
source WORD 10 DUP("AO")
target WORD 10 DUP(?)

.code
mov esi, OFFSET source
add esi, 18
mov edi, OFFSET target
add edi, 18
mov ecx, LENGTHOF target
std
repe movsw

Group of answer choices:

A: 18 should not be added to the ESI and EDI registers

B: ECX should be set to the length of the source, not the target

C: The direction flag should be cleared with CLD, not set with STD

D: The REPE prefix should be replaced with REP

The code below is supposed to copy whatever's in the source variable into
the target variable. However, there is a single error, which will cause it to
work correctly if fixed. What is it?
.data
source WORD 10 DUP ("AO")
target WORD 10 DUP (?)
.code
mov esi, OFFSET source
add esi, 18
mov edi, OFFSET target
add edi, 18
mov ecx, LENGTHOF target
std
repe movsw
O 18 should not be added to the ESI and EDI registers
ECX should be set to the length of the source, not the target
The direction flag should be cleared with CLD, not set with STD
The REPE prefix should be replaced with REP

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