ARM EN0-001 問題集

質問 1：
What is an "Entry point" in an application?
A. The location of the main () function
B. A location where the linker can store additional information
C. The lowest address contained in a program image
D. A place where execution can start
正解：D

質問 2：
Which ARMv7 instructions are recommended to implement a semaphore?
A. LDREX, STREX
B. STC, SBC
C. TEQ, TST
D. SWP, SWPB
正解：A

質問 3：
When programming in C, how many bytes of stack are needed to pass parameters when calling the following function?
int foo( int arg_a, int arg_b, int arg_c )
A. 0
B. 12
C. 8
D. 4
正解：A

質問 4：
Which of the following statements regarding Strongly-ordered memory is architecturally FALSE?
A. A write to Strongly-ordered memory is permitted to complete before it reaches the peripheral or memory component accessed by the write
B. Address locations marked as Strongly-ordered memory are never held in a cache
C. The number and size of accesses to Strongly-ordered memory must be the same as that specified by the program
D. The architecture does not permit speculative data accesses to Strongly-ordered memory
正解：A

質問 5：
If the memory location 0x5000 contains 0Xffff0001, what is the value of r0 after the following instructions are executed?
MOV r1, #0x5000
LDRSH r0, [r1]
ADD r0, r0, #1
(Assume a little-endian memory system)
A. 0x00000002
B. 0xFFFF0001
C. 0xFFFF0002
D. 0xFFFFFFFE
正解：A

質問 6：
Which TWO of the following mechanisms cause the ARM processor to take an abort? (Choose two)
A. Unrecognized instruction opcode
B. Illegal operands for a data-processing instruction
C. Bounced coprocessor instruction
D. MPU fault
E. External memory system error
正解：D,E

質問 7：
In an ARMv7-R processor, with which level of the memory system is the Memory Protection Unit (MPU) associated?
A. Level 2
B. Level 1
C. Level 3
D. Level 4
正解：B