Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN: 9780133594140
Author: James Kurose, Keith Ross
Publisher: PEARSON
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Question
What is SUB ADR LDM STRD BL.W?
What does sp,sp,#0x28 mean?
What does r3, r0, r1, r2 mean?
What does my-strcpy and my_capitalise mean?
![Figure Q7 below shows a simple program written in C and complied in ARM
Keil.
Ox080006D4 B08A
33:
34:
35:
OX080006D6 A307
OX080006D8 CBOF
0×080006DA E9CD2308
0×080006DE E9CD0106
36:
0×080006E2 A901
O×080006E4 A806
0×080006E6 F7FFFDA9
37:
38:
OX080006EA A801
0×080006EC F7FFFDAD
SUB
const char a[]
char b(20]:
sp,sp,#0x28
"Hello world!";
ADR
r3,(pc)+0x20
2 @0×080006F4
r3,(r0-r3)
STRD r2,r3,(sp,#0x20]
STRD r0,rl,/sp,#0x18)
LDM
my_strcpy (a, b),
ADD
ADD
rl,sp,#0x04
r0,sp,#0x18
BL.W my_strepy (0x0800023C)
my_capitalize (b);
ADD
r0,sp,#0x04
BL.W my_capitalize (0×0800024A)
Figure 07](https://content.bartleby.com/qna-images/question/a5697e4d-cdc9-416d-9deb-b019c703ee3a/76759dbe-4711-4763-a854-094520924a18/yt2db1w_processed.jpeg)
Transcribed Image Text:Figure Q7 below shows a simple program written in C and complied in ARM
Keil.
Ox080006D4 B08A
33:
34:
35:
OX080006D6 A307
OX080006D8 CBOF
0×080006DA E9CD2308
0×080006DE E9CD0106
36:
0×080006E2 A901
O×080006E4 A806
0×080006E6 F7FFFDA9
37:
38:
OX080006EA A801
0×080006EC F7FFFDAD
SUB
const char a[]
char b(20]:
sp,sp,#0x28
"Hello world!";
ADR
r3,(pc)+0x20
2 @0×080006F4
r3,(r0-r3)
STRD r2,r3,(sp,#0x20]
STRD r0,rl,/sp,#0x18)
LDM
my_strcpy (a, b),
ADD
ADD
rl,sp,#0x04
r0,sp,#0x18
BL.W my_strepy (0x0800023C)
my_capitalize (b);
ADD
r0,sp,#0x04
BL.W my_capitalize (0×0800024A)
Figure 07
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