ARM EN0-001 Exam Questions Free Practice Test

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Questions # 21:

In which of the following situations would you use a mutex to avoid synchronization problems?

Options:

A single-threaded application needs to manage two separate UART peripherals

Two independent threads running on a single processor both need to access a single UART

In a dual-core system, a UART is accessed by a single thread running on one of the processors

In a dual-core system, processor A needs to access UART A and processor B needs to access UART B

Expert Solution

Questions # 22:

A C code segment contains three calls to a function, foobar ().

This code segment is to be linked with a static library that defines foobar ().

Ignoring inlining, how many copies of foobar () will the ARM linker place in the output?

Options:

None

Always one

Always three

One or more depending on optimization level

Expert Solution

Questions # 23:

Which one of these statements is TRUE about code running on final hardware without a debugger attached?

Options:

FIQ exceptions must not be taken

The instruction cache must be enabled

Global variables must be initialized to zero

The Reset Vector must reside in non-volatile memory

Expert Solution

Questions # 24:

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?

Options:

0x00000000

0xFFFFFFFF

0x11111111

0xAAAAAAAA

Expert Solution

Questions # 25:

An advantage of native compiling over cross compiling is that:

Options:

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

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

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

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

Expert Solution

Questions # 26:

As part of the ABI specification, the AAPCS defines which of the following?

Options:

How many levels of nested function calls are permitted on ARM systems

How to measure the maximum amount of stack required by an application

On which mode's stack you need to save the return address in a non-leaf function

Which registers need to be preserved by a function

Expert Solution

Questions # 27:

Many ARM cores provide two instruction sets, ARM and Thumb. Which THREE of the following statements apply to the Thumb instruction set implemented for the ARMv7-A architecture? (Choose three)

Options:

Thumb is a hybrid 16/32-bit instruction set

No Thumb instructions can be conditionally executed

Thumb code is always slower than the equivalent ARM code

Some routines take more instructions in Thumb code than in the equivalent ARM code

The Thumb instruction set can access the Advanced SIMD "NEON" instructions

Thumb code is always more power-efficient than equivalent ARM code

Expert Solution

Questions # 28:

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?

Options:

0xFFFFFFFF

0xFFFFFFF0

0xFFFF0000

0x0000FFFF

Expert Solution

Questions # 29:

Which of the following options lists the power modes in order of increasing overhead of entry and exit from run mode?

Options:

Shutdown, dormant, standby

Dormant, standby, shutdown

Shutdown, standby, dormant

Standby, dormant shutdown

Expert Solution

Questions # 30:

A program running on a development board that is connected to a host using a debugger can access a file on the host by using:

Options:

Memory mapping

Semihosting

Polling

Virtual I/O

Expert Solution

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