Bubble sort in x86 (masm32), the sort I wrote doesn't work

Question

I'm trying to write a bubble sort in x86 (masm32). The sort doesn't work. I've tested some of the code and it appears to be messed up in the compare and swap sections. For some reason, the compare function always assigns 2 to EAX. If I can figure out why I can get the program working.

Thanks for your help in advance.

    .data
          aa DWORD 10 DUP(5, 7, 6, 1, 4, 3, 9, 2, 10, 8)
        count DWORD 0
; DB 8-bits, DW 16-bit, DWORD 32, WORD 16 BYTE 8



    .code                       ; Tell MASM where the code starts

; ?????????????????????????????????????????????????????????????????????????

start:                          ; The CODE entry point to the program

    mov esi, count ;loop count

    outer:
        inc esi
        mov edi, count        
        cmp esi, 9       
        je end_loop

    inner: ;this loop represents a full pass on the entire array
        inc edi        
        cmp edi, 9 ;after 9 passes goes to outer loop
        je outer

    compare:
        mov eax, [aa + edi * 4h] ;higher indexed one
        mov ebx, [aa + edi * 4h - 4h] 

;testing        print chr$(13,10)
;testing        print str$(eax)
;testing        print chr$(13, 10)
;testing        print str$(ebx)
;testing        print chr$(13, 10)

        cmp ebx, eax
        jg swap

    swap:
        mov [aa + edi * 4h], eax
        mov [aa + edi * 4h + 4], ebx
        jmp inner

end_loop:

    ;print out array elements
    sub esi, esi
    mov esi, [aa]
    print str$(esi)
    print chr$(" ")
    sub esi, esi

    mov esi, [aa + 4h]
    print str$(esi)
    print chr$(" ")
    sub esi, esi

    mov esi, [aa + 4h * 2]
    print str$(esi)
    print chr$(" ")
    sub esi, esi

    mov esi, [aa + 4h * 3]
    print str$(esi)
    print chr$(" ")
    sub esi, esi

    mov esi, [aa + 4h * 4]
    print str$(esi)
    print chr$(" ")
    sub esi, esi

    mov esi, [aa + 4h * 5]
    print str$(esi)
    print chr$(" ")
    sub esi, esi

    mov esi, [aa + 4h * 6]
    print str$(esi)
    print chr$(" ")
    sub esi, esi

    mov esi, [aa + 4h * 7]
    print str$(esi)
    print chr$(" ")
    sub esi, esi

    mov esi, [aa + 4h * 8]
    print str$(esi)
    print chr$(" ")
    sub esi, esi

    mov esi, [aa + 4h * 9]
    print str$(esi)
    print chr$(" ")
    sub esi, esi

exit


; ?????????????????????????????????????????????????????????????????????????

end start                       ; Tell MASM where the program ends

Answer 1

Figured out what was wrong - the print statements in the middle of the program were hosing my memory. Here is the working sort. Thanks for the help everyone!

    .data
          aa DWORD 10 DUP(5, 7, 6, 1, 4, 3, 9, 2, 10, 8)
        count DWORD -1
; DB 8-bits, DW 16-bit, DWORD 32, WORD 16 BYTE 8



    .code                       ; Tell MASM where the code starts

; ?????????????????????????????????????????????????????????????????????????

start:                          ; The CODE entry point to the program

    mov esi, count ;loop count

    outer:
        inc esi
        mov edi, count        
        cmp esi, 10       
        je end_loop

    inner: ;this loop represents a full pass on the entire array
        inc edi        
        cmp edi, 9 ;after 9 passes goes to outer loop
        je outer

    compare:
        mov eax, [aa + edi * 4h]
        mov ebx, [aa + edi * 4h + 4] ;want to make this one the higher indexed-one

        ;print chr$(13,10) These print calls were hosing the memory before.
        ;print str$(eax)
        ;print chr$(13, 10)
        ;print str$(ebx)
        ;print chr$(13, 10)

        cmp eax, ebx
        jle inner

    swap:
        mov [aa + edi * 4h], ebx
        mov [aa + edi * 4h + 4], eax
        jmp inner

end_loop:

    ;print out array elements
    sub esi, esi
    mov esi, [aa]
    print str$(esi)
    print chr$(" ")
    sub esi, esi

    mov esi, [aa + 4h]
    print str$(esi)
    print chr$(" ")
    sub esi, esi

    mov esi, [aa + 4h * 2]
    print str$(esi)
    print chr$(" ")
    sub esi, esi

    mov esi, [aa + 4h * 3]
    print str$(esi)
    print chr$(" ")
    sub esi, esi

    mov esi, [aa + 4h * 4]
    print str$(esi)
    print chr$(" ")
    sub esi, esi

    mov esi, [aa + 4h * 5]
    print str$(esi)
    print chr$(" ")
    sub esi, esi

    mov esi, [aa + 4h * 6]
    print str$(esi)
    print chr$(" ")
    sub esi, esi

    mov esi, [aa + 4h * 7]
    print str$(esi)
    print chr$(" ")
    sub esi, esi

    mov esi, [aa + 4h * 8]
    print str$(esi)
    print chr$(" ")
    sub esi, esi

    mov esi, [aa + 4h * 9]
    print str$(esi)
    print chr$(" ")
    sub esi, esi

exit


; ?????????????????????????????????????????????????????????????????????????

end start                       ; Tell MASM where the program ends