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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)
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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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
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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