Nios/memmove

Write a function that copies a block of memory from the source location to the destination location. The source and destination arrays may overlap, and the copy must still work correctly (contrast memmove with nios/memcpy). The source and destination are byte-aligned, and length can be any number of bytes.

You may assume the source and destination arrays do not wrap around the top of memory space (i.e., 0 <= source and source+length <= 4GB).

void memmove (char* destination, char* source, unsigned int length);

Expected solution length: Around 25 lines.

Sample Input

0x9999, 0, 0, 0, 0, 0xaaaa, 1, 2, 3, 4, 0xbbbb
Copy 16 bytes from offset 24 to offset 4

Sample Output

0x9999, 1, 2, 3, 4, 0xaaaa, 1, 2, 3, 4, 0xbbbb

.data
.word 0x9999
Dest: .word 0, 0, 0, 0, 0xaaaa
Src: .word 1, 2, 3, 4, 0xbbbb

.text
.global _start
_start:
    movia r4, Dest
    movia r5, Src
    movia r6, 16
    call memmove
    1: br 1b    # Done

.global memmove
memmove:

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nios/memmove

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Nios/memmove

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