PROC Directive (Cont.) 


 
   label  PROC [attributes] [USES reglist], parameter_list
parameter_list is 

 
   parameter_1, parameter_2, ..., parameter_n
A single parameter has the following syntax: 

 
     paramName: type
paramName is an arbitrary name you assign to the parameter. Its scope is limited to the current procedure. Type can also be a qualified type, which may be a pointer to an existing type. Examples of qualified types are 

 
   PTR BYTE       PTR SBYTE      PTR WORD       PTR SWORD

 
   PTR DWORD      PTR SDWORD     PTR QWORD      PTR TBYTE
 An ABS Procedure Using 
 Passing by Value   Passing by Reference  

 
 INCLUDE Irvine32.inc

 
 .code

 
 ;; Find |value|

 
 abs PROC, val:SDWORD

 
      cmp   val, 0

    

     

 

       

     
     

 

    
    
    


     

     		
    

   

 
      neg   val

 
 POS: ret

 
 abs ENDP


 
 ;; main proc is after abs proc.

 
 main PROC

 
  LOCAL  value:SDWORD

 
      mov     value, -23

 
      INVOKE  abs, value

 
      mov     eax, value

 
      call    WriteInt

 
      exit

 
 main ENDP

 
 END main
 

 
 INCLUDE Irvine32.inc

 
 .code

 
 ;; Find |value|

 
 abs PROC, ptrVal:PTR SDWORD

 
      mov   esi, ptrVal

 
      cmp   SDWORD PTR[esi], 0

    

     

 

       

     
     

 

    
    
    


     

     		
    

   

 
      neg   SDWORD PTR[esi]

 
 POS: ret

 
 abs ENDP


 
 ;; main proc is after abs proc.

 
 main PROC

 
  LOCAL  value:SDWORD

 
      mov     value, -23

 
      INVOKE  abs, ADDR value

 
      mov     eax, value

 
      call    WriteInt

 
      exit

 
 main ENDP

 
 END main
 Output  Output

   


   



      “I’m not arguing, I’m just explaining why I’m right.”    
      ― Unknown