ARM ARM Certifications EN0-001 Questions & Answers

• Question 181:

  In a Cortex-A processor, assume an initial value of R1 =0x80004000.

  If the following instruction causes a data abort, what value will R1 contain on entry to the abort handler?

  LDR R0, [R1, #8]!

  A. 0x80003FF8

  B. 0x80004000

  C. 0x80004008

  D. R1 contents are unpredictable

  Correct Answer: B

• Question 182:

  Which of the following operations would count as intrusive to normal processor operation?

  A. Tracing using Embedded Trace Macrocell (ETM)

  B. Halt mode debugging

  C. Monitor mode debugging

  D. Using the Performance Monitor Unit

  Correct Answer: B

• Question 183:

  In an ARMv7-A processor that includes the Advanced SIMD extension (NEON), where are the data values operated on by NEON instructions stored?

  A. In system memory

  B. In registers shared with the VFP register set

  C. In registers shared with the integer register set

  D. In dedicated registers not shared with other registers

  Correct Answer: B

• Question 184:

  Which of the following sequences of stages comprise the ARM7TDMI three-stage pipeline?

  A. Fetch, Decode, Execute

  B. Decode, Fetch, Execute

  C. Execute, Fetch, Decode

  D. Fetch, Execute, Execute

  Correct Answer: A

• Question 185:

  According to the AAPCS, which of the following statements is TRUE with regard to preservation of register values by a function?

  A. A function must preserve R0-R3 and R12

  B. A function must preserve R4-R11 andR13

  C. No registers may be corrupted by any function

  D. All registers may be corrupted by any function

  Correct Answer: B

• Question 186:

  An advantage of native compiling over cross compiling is that:

  A. It can enable the final code to be smaller, and execute more quickly.

  B. It allows greater parallelism when building code by utilizing many processors.

  C. The compiler is able to produce error and warning messages in a range of languages.

  D. Build scripts can detect details of the target, and automatically configure the build to match.

  Correct Answer: D

• Question 187:

  An interrupt handler contains the following instruction sequence at the end. The purpose of these instructions is to clear the interrupt request in the interrupt controller and then safely re-enable interrupts.

  STR r0, [r1] ; write to interrupt controller register to clear interrupt request

  CPSIE i ; re-enable IRQ interrupts Which of the following instructions should be placed at position in order to ensure that the interrupt

  controller sees the write before interrupts are re-enabled?

  A. DMB

  B. DSB

  C. ISB

  D. NOP

  Correct Answer: B

• Question 188:

  The purpose of a translation lookaside buffer (TLB) is to:

  A. Protect memory.

  B. Improve performance.

  C. Implement virtual memory,

  D. Ensure correct ordering of memory operations.

  Correct Answer: B

• Question 189:

  How many bytes of stack are needed to pass parameters when calling the following function?

  int foo( short arg_a, long long arg_b, char arg_c, int arg_d )

  A. 0

  B. 4

  C. 8

  D. 15

  Correct Answer: C

• Question 190:

  Which one of the following statements is TRUE for software breakpoints?

  A. Limited software breakpoints can be placed in code running from ROM

  B. Each software breakpoint requires one watchpoint resource in the debug hardware

  C. Each software breakpoint requires one breakpoint resource in the debug hardware

  D. The number of available software breakpoints is not limited by the debug hardware

  Correct Answer: D