sample.ys

 # Execution begins at address 0
.pos 0
init:  irmovl Stack, %esp       # Set up stack pointer
irmovl Stack, %ebp       # Set up base pointer
call Main                # Execute main program
halt                     # Terminate program
# Array of 4 elements
.align 4
array: .long 0xd
.long 0xc0
.long 0xb00
.long 0xa000
Main:  pushl %ebp
rrmovl %esp,%ebp
irmovl $4,%eax
pushl %eax               # Push 4
irmovl array,%edx
pushl %edx               # Push array
call Sum                 # Sum(array, 4)
rrmovl %ebp,%esp
popl %ebp
ret
#/* $begin sum-ys 0 */
# int Sum(int *Start, int Count)
Sum:   pushl %ebp
rrmovl %esp,%ebp
irmovl 8, %edi
addl %edi, %ebp
mrmovl (%ebp),%ecx      # ecx = Start
irmovl 12, %edi
addl %edi, %ebp
mrmovl (%ebp),%edx     # edx = Count
xorl %eax,%eax           # sum = 0
andl %edx,%edx           # Set condition codes
je End
Loop:  mrmovl (%ecx),%esi       # get *Start
addl %esi,%eax           # add to sum
irmovl $4,%ebx
addl %ebx,%ecx           # Start++
irmovl $1,%ebx
subl %ebx,%edx           # Count--
jne Loop                 # Stop when 0
End:   rrmovl %ebp,%esp
popl %ebp
ret
#/* $end sum-ys 0 */
# The stack starts here and grows to lower addresses
.pos 0x100
Stack: