Determine the value in LR (R14) and PC (R15) when microprocessor is executing the instruction in Line 21 (SUBS R0, R0, #0x05
Determine the value in LR (R14) and PC (R15) when microprocessor is executing the instruction in Line 21 (SUBS R0, R0, #0x05
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Question
Determine the value in LR (R14) and PC (R15) when microprocessor is executing the
instruction in Line 21 (SUBS R0, R0, #0x05).
![Listing Q. a shows a simple ARM Cortex-M3 assembly program. After the program is
assembled, the disassembly file is given in Listing Q. Ib.
main
SP, Ox10000200
MOVW R3, #0x0200
MOVT R3, #0x1000
Routinel
RO, #0x10
RI, #0x10
R2, RO, RI
R2, [R3]
1:
LDR
2:
3:
4:
BL
5:
MOV
6:
MOV
7:
ADDS
8:
STR
9:
10: stop
B
stop
11:
(LR}
RO, #0x20
RI, RO, #0x05
Routine2
12: Routinel PUSH
13:
MOV
14:
SUBS
15:
BL
NOP
POP
16:
17:
{PC}
18:
(LR}
RO, #0x30
RO, RO, #0x05
Routine3
19: Routine2 PUSH
20:
MOV
21:
SUBS
22:
BL
23:
NOP
24:
POP
{PC}
25:
26: Routine3 MOV
RO, #0x40
RO, RO, #0x05
27:
SUBS
28:
BX
LR
Listing Q2 .a: Assembly program](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fdb360d4b-1f2a-41fb-ac7d-c0c009990956%2F4030b310-cdbf-42a8-ae3a-470c82e024d2%2Fwzplhl9_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Listing Q. a shows a simple ARM Cortex-M3 assembly program. After the program is
assembled, the disassembly file is given in Listing Q. Ib.
main
SP, Ox10000200
MOVW R3, #0x0200
MOVT R3, #0x1000
Routinel
RO, #0x10
RI, #0x10
R2, RO, RI
R2, [R3]
1:
LDR
2:
3:
4:
BL
5:
MOV
6:
MOV
7:
ADDS
8:
STR
9:
10: stop
B
stop
11:
(LR}
RO, #0x20
RI, RO, #0x05
Routine2
12: Routinel PUSH
13:
MOV
14:
SUBS
15:
BL
NOP
POP
16:
17:
{PC}
18:
(LR}
RO, #0x30
RO, RO, #0x05
Routine3
19: Routine2 PUSH
20:
MOV
21:
SUBS
22:
BL
23:
NOP
24:
POP
{PC}
25:
26: Routine3 MOV
RO, #0x40
RO, RO, #0x05
27:
SUBS
28:
BX
LR
Listing Q2 .a: Assembly program
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