; ASM implementation of an if() statement
;
; if (condition) then  
;     then_block
;

; include directives
global asm_main
%include "../lib/asm_io.inc"

segment .data
    ; DX directives (read only, static data)

segment .bss
    ; RESX directives (writable data)

segment .text
asm_main:                   ; entry point (called from driver.c)
    ; instructions

    enter 0,0               ; Initialize register EBP
    pusha                   ; Push register contents to the stack
    ;

    mov   eax, 4096         ; put test data in EAX
    mov   ecx, 96           ; put test data in ECX

    cmp   eax, ecx          ; compare
    jle   end_if            ; evaluate for <=

    ; then block
    sub  eax, ecx           ; 4096-96

end_if:
    call  print_int         ; Print 4096 is not modified
    call  print_nl          ; otherwise, print 4000

    ;
    popa                    ; Restore register data from the stack
    mov   eax, 0            ; flush EAX of data
    leave                   ; restore the stack
    ret                     ; Return from main back into C library wrapper