.data

A: .asciz "helloworld123а567890"
B: .asciz "helloworld123б567890"

.text
.global mystrcmp

.global A
.global B
.global main

mystrcmp:
  pushl %ebp
  movl  %esp, %ebp
  pushl %ebx
  pushl %esi

  pushl %edi
  pushl %ecx

  movl  8(%ebp), %ebx
  movl  12(%ebp), %esi

  xorl    %edi, %edi
  xorl    %ecx, %ecx

  movzx (%esi), %edi
  movzx (%ebx), %ecx

  movl  $1, %eax
  loop:
  cmpl   $0, %ecx
  jz str1_end
  cmpl   $0, %edi
  jz out
    cmpl %ecx, %edi
    jl out
    jnz neg
    addl $1, %ebx
    addl $1, %esi
    movzx (%esi), %edi
    movzx (%ebx), %ecx
    jmp loop
  str1_end:
    movl $0, %eax
    cmpl  $0, %edi
    jz out
    neg:
      movl $-1, %eax
  out:

  popl  %ecx
  popl  %edi

  popl  %esi
  popl  %ebx
  popl  %ebp
  ret

main:
  pushl $B
  pushl $A
  call mystrcmp