EN0-001問題集、ARM実際の試験問題

質問 1

If a 16-bit Thumb instruction causes a Data Abort, which instruction would return from the handler to the instruction after the one that caused the data abort?

A. SUBS PC, LR, #8

B. SUBS P LR, #6

C. SUBS PC. LR

D. SUBS PC, LR-#4

正解: B

質問 2

The effect of clicking the Stop button in a debugger is to:

A. Force the processor to execute a BKPT instruction

B. Re-initialize the memory contents.

C. Hold the processor in a Reset condition

D. Put the processor(s) into debug state.

正解: D

質問 3

What debugger view can you use to determine which function caused an exception?

A. The Breakpoint view

B. The Call Stack view

C. The Variables view

D. The Memory view

正解: B

質問 4

Which of the following is TRUE for dynamically linked executables?

A. They are designed to be run standalone with no other supporting software

B. They can contain unresolved relocations

C. They contain the code and data for all libraries they use

D. They are larger than an equivalent statically linked application

正解: B

質問 5

In an experiment, the time taken for an application to complete a given task is measured using a stopwatch. Which THREE of the following make up the total time? (Choose three)

A. The time taken to compile the source code

B. The time taken to perform instruction tracing

C. The time taken for memory accesses

D. The time taken for the CPU to execute instructions

E. The time spent waiting for I/O operations

F. The time taken to download the program via the debugger

正解: C,D,E

質問 6

On an ARM processor that does not implement Security Extensions, which one of the following can be the starting address of the exception vector table?

A. 0xFFFF0000

B. 0xFFFFFFF0

C. 0xFFFFFFFF

D. 0x0000FFFF

正解: A

質問 7

A deeply embedded real-time industrial control system is missing some hard real-time interrupt deadlines. Which of the following performance analysis techniques is the most suitable for identifying which routines are causing the problem?

A. Use a JTAG sample-based profiler, which periodically halts the CPU, and dumps information about the interrupted process

B. Use an ETM instruction trace profiler, which outputs information about the program as it runs

C. Add some serial logging to the software, which outputs information about the program as it runs

D. Add a new interrupt handler, which is triggered off a timer, and dump information about the interrupted process

正解: B

質問 8

What type of debug point would you set when debugging flash memory or ROM?

A. Software breakpoint

B. Hardware breakpoint

C. Step point

D. Start point

正解: C

質問 9

Before execution: R0=0xFFFFFFFF
R1 = ?
EOR R0, R0, R1
If R0=0x00000000 after executing the EOR instruction above, what was the value in R1 before the instruction executed?

A. 0x00000000

B. 0xAAAAAAAA

C. 0x11111111

D. 0xFFFFFFFF

正解: D

質問 10

When an ARMv7-A MPCore system is in SMP mode, which of the following TWO operations can the processor handle automatically? (Choose two)

A. Broadcast of some outer-shared cache and TLB maintenance operations

B. Coherency management between all L1 instruction caches

C. Coherency management between all L1 data caches

D. Coherency management between all external caches

E. Broadcast of some inner-shared cache and TLB maintenance operations

正解: C,E

質問 11

Which of the following is preserved in dormant mode?

A. Core register contents

B. Debug state

C. CP15 (system) register settings

D. Cache contents

正解: D

質問 12

In an ARMv7-A system, the following C function calculates a simple checksum for an input data packet of variable length. The checksum is defined to be the sum of all of the 16-bit data items in the packet modulo 65536. The parameter data_items contains the number of 2-byte data items in the packet, and it cannot be zero by design.

When using an ARM compiler, which TWO of the following optimizations could improve the performance of this code? (Choose two)

A. Declare sum as a global variable

B. Change the type of i to be an unsigned int

C. Use signed variables instead of unsigned variables

D. Change the type of sum to be an unsigned short

E. Use a do/while loop instead of a for loop

正解: B,E

質問 13

In a symmetric multi-processing (SMP) software architecture, which of the following pairs of statements are TRUE? (Select the option in which BOTH statements are TRUE).

A. The roles of individual cores are statically determined by the system designer. Hardware must be implemented to provide cache coherency between the cores.

B. The roles of individual cores are determined dynamically. Each core has its own set of external peripherals.

C. Each core has the same view of memory and peripherals. The roles of individual cores are statically determined by the system designer.

D. Each core has the same view of memory and shared peripherals. Any user application, process or task can be scheduled to run on any core.

正解: D

ARM Accredited engineer - EN0-001 模擬練習