One friend asked help with home work. Its crappy snippet perform selection sort.

selection_sort.asm

.686
.model flat
.stack

data segment "data"

data ends

.CODE

; stack:
; pointer to compare
; pointer to array end
; pointer to array start

; EDX - pointer to compare
; EBX - array end
; ECX - swap candidate
; ESI - array current position
; EDI - array current base
sort_kb3 PROC

cmp ESI, EBX ; until not pointing at end of array
jne begin ; begin
ret
begin:

  mov EDI, ESI
  mov ECX, ESI

loop_begin:
    cmp EDI, EBX
    je loop_end

  ;comparing
      ; save registers
      push EDX
      push EBX
      ; prepare call

        push EDI
        push ECX
        call EDX
        pop ECX
        pop EDI

      pop EBX
      pop EDX

    cmp EAX, 1
      jne not_minimal
    mov ECX, EDI
not_minimal:

  add EDI, 4
  jmp loop_begin

loop_end:

; swap to minimal
mov EAX, dword ptr [ESI]
mov EDI, dword ptr[ECX]
mov dword ptr[ESI], EDI
mov dword ptr[ECX], EAX

add ESI, 4 ; move base, first element sorted already
jmp sort_kb3 ; restart snippet
sort_kb3 ENDP

; (pointer to struct, pointer to compate)
_sort_kb3 PROC
  push EBP
  mov EBP, ESP

  mov EAX, [ESP+8] ; pointer to struct
  mov EDX, [ESP+12] ; pointer to compate

  push ESI
  push EDI

  mov ESI, dword ptr [EAX] ; pointer to array
  mov ECX, dword ptr [EAX+4] ; pointer to size


  mov EAX, ESI
  shl ECX, 2 ; multiptly to int size
  add EAX, ECX
  mov EBX, EAX ; set array end

  call sort_kb3

  pop EDI
  pop ESI
  mov ESP, EBP
  pop EBP
  ret
_sort_kb3 ENDP

END