AREA myData, DATA str DCB "Less is more", 0 AREA MyCode, CODE EXPORT main ALIGN ENTRY main PROC LDR r0, =str rl, #'e' ; ro and rl are arguments MOVS BL MyFunc stop stop ENDP MyFunc PROC MOV r2, r0 loop LDRB r3, [r0] CBZ r3, exit CMP r3, rl LDRBNE r3, [r0] STRBNE r3, [r2] ADDNE r2, r2, #1 ADD r0, r0, #1 B loop exit STRB r3, [r2] BX lr ENDP

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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Question
1. Consider the following ARM Assembly. Notice there are 2 functions, main and MyFunc.
Descriptively comment each line between "_main PROC" and "END" of the code and state what
this program does. Also comment on the function of each register used.
AREA myData, DATA
str
DCB
"Less is more", 0
AREA MyCode, CODE
EXPORT
main
-
ALIGN
ENTRY
main
PROC
LDR
r0,
=str
MOVS
rl,
#'e'
; ro and rl are arguments
BL
MyFunc
stop
в
stop
ENDP
MyFunc
PROC
MOV
r2,
r0
loop
LDRB
r3,
[r0]
CBZ
r3,
exit
CMP
r3,
rl
LDRBNE
r3,
[r0]
STRBNE
r3,
[r2]
ADDNE
r2,
r2,
#1
ADD
r0,
r0,
#1
B
loop
exit
STRB
r3,
[r2]
BX
lr
ENDP
END
Transcribed Image Text:1. Consider the following ARM Assembly. Notice there are 2 functions, main and MyFunc. Descriptively comment each line between "_main PROC" and "END" of the code and state what this program does. Also comment on the function of each register used. AREA myData, DATA str DCB "Less is more", 0 AREA MyCode, CODE EXPORT main - ALIGN ENTRY main PROC LDR r0, =str MOVS rl, #'e' ; ro and rl are arguments BL MyFunc stop в stop ENDP MyFunc PROC MOV r2, r0 loop LDRB r3, [r0] CBZ r3, exit CMP r3, rl LDRBNE r3, [r0] STRBNE r3, [r2] ADDNE r2, r2, #1 ADD r0, r0, #1 B loop exit STRB r3, [r2] BX lr ENDP END
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