Slide 13.5: ADDR operator
Slide 13.7: PROTO directive
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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