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# Write a subroutine using the ARM assembly programming language to construct tables of 20 (n = 0, 1, 2, …, 19) 32-bit data.

INSTRUCTIONS TO CANDIDATES

Question 1

A block of memory contains 50 random words of data. Assume that the values are in two’s complement representations and are stored in the R/W memory area. You need to provide the 50 random words and to include them in an initialization file: assign2.ini. Write a program using the ARM assembly programming language to do the following:

1. You are required to reverse the word order in a block of 50 random words (Hint: the last word stored in the memory becomes the first and vice versa)
2. Next, find the minimum and maximum value in the 50 random words of

(10 marks)

Question 2

1. Write a subroutine using the ARM assembly programming language to construct tables of 20 (n = 0, 1, 2, …, 19) 32-bit data. There are 2 inputs to the subroutine. One is an option and the other is the starting address of the table to be There are 2 possible options: 1 or 2. This option will dictate how you should construct the table. This is shown as followed:

option = 1:  Build a table of an arithmetic sequence numbers. This sequence has a difference of 3 between each number. The pattern is continued by adding 3 to the last number each time, like this: 1, 4, 7, 10, 13, 16,

19, 22, 25, ... Assume that the first number is 1.

option = 2:    Build a table of a geometric sequence numbers. This sequence has a factor of 3 between each number. The pattern is continued by multiplying by 3 to the last number, like this: 1, 3, 9, 27, 81, 243, ... Assume that the first number is 1.

1. Write the main program using the ARM assembly programming language to call the subroutine written in part (2a). The main program needs to provide the 2 inputs to the subroutine: an option and the starting address of the table to be constructed

Hint: you need to use the key concepts of table generation, jump table and subroutine.

(10 marks)

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