Question

Read the lab rules posted on the course page. Do not use assembler directives or loops in this session. Write ARM assembly programs to fulfill the tasks below:

1 - Load the number 123 to R9. Move this value to R7.
2 - Load the number 0×4400 to R5. Load the number 99 to R6. Store the contents of R6 to the memory at the address in R5.
3 - Continuing from 2, load the contents of the memory at the address 0×4400 to R5.
4 - Starting from the address 0x4400, store the numbers 11,22,33,44 to the memory as bytes. Mind the endian ordering.
5 - Continuing from 4 , add the numbers stored to the memory and store the result in R6.

Answer 1

ARM Assembly code snippets indicate the loading and storing of values in registers, memory operations, and addition of byte values from memory, respecting the specified rules and endian ordering.

Step-by-step explanation:

ARM Assembly Program Tasks

To complete the ARM assembly programming tasks, use the following code snippets:

1. Load the number 123 to R9 and move to R7:
   MOV R9, #123
   MOV R7, R9
2. Load 0x4400 into R5, store 99 from R6:
   MOV R5, #0x4400
   MOV R6, #99
   STR R6, [R5]
3. Load the contents of memory at 0x4400 to R5:
   LDR R5, [R5]
4. Store the numbers 11, 22, 33, 44 to memory as bytes:
   MOV R6, #11
   STRB R6, [R5]
   MOV R6, #22
   STRB R6, [R5, #1]
   MOV R6, #33
   STRB R6, [R5, #2]
   MOV R6, #44
   STRB R6, [R5, #3]
5. Add the numbers from memory and store in R6:
   LDRB R6, [R5]
   LDRB R7, [R5, #1]
   ADD R6, R6, R7
   LDRB R7, [R5, #2]
   ADD R6, R6, R7
   LDRB R7, [R5, #3]
   ADD R6, R6, R7Note that you need to preserve endian ordering when storing the bytes, and the addition is cumulative, summing each number transferred from memory.