I am being asked to write a MIPS program that considers the implementation of the standard C library function strcpy in assembly language. The assembly code for strcpy is

strcpy:

addi $sp, $sp, -4

sw $s0, 0($sp)

add $s0, $zero, $zero

L1:

add $t1, $s0, $a1

lbu $t2, 0($t1)

add $t3, $s0, $a0

sb $t2, 0($t3)

beq $t2, $zero, L2

addi $s0, $s0, 1

j L1

L2:

lw $s0, 0($sp)

addi $sp, $sp, 4

jr $ra

From this code we are to implement memset, strlen, strchr, strcat, and strcmp. These are the requirements for the program.

Use $a0 through $a3 as necessary for the standard C library's arguments to each function.

Return in $v0. Do *not* write in the main program.

You will be given a testing program soon.

It is fine if a lot of your functions look a lot like each other. In fact, that's a good sign.

Don't worry about overruns or exception cases.