Arm/increment align

Write a function that increments a 32-bit word located in memory. The location to modify is passed as the first parameter to the function. Note that this pointer is not necessarily 4-byte aligned, but your routine must only do properly aligned accesses.

void inc (int* p);

Expected solution length: Around 20 lines.

Sample Input

 Pointer: .word 1234

Sample Output

(memory changed to 1235)

.data
.byte 0    // Test with an unaligned word.
Pointer: .word 1234
.text
.global _start
_start:
    ldr r0, =Pointer
    bl inc
    1: b 1b    // Done

.global inc
inc:

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Arm/increment align

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Sample Output

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Solution