CALL Instruction


         call  DumpRegs          ; display registers
This statement calls a procedure that displays the current values of the CPU registers. The instruction calls a procedure by directing the processor to begin execution at a new memory location. Procedures could be user-defined or built-in.

CALL — Procedure Call
Usage: CALL destination

Flag O D I S Z A P C
Result                

Pushes “Instruction Pointer” (and “Code Segment” for far calls) onto stack and loads “Instruction Pointer” with the address of “proc-name”. Code continues with execution at .
Clocks
Operands 286 386 486
rel16 (near, IP relative) 7 7+m 3
rel32 (near, IP relative)   7+m 3
reg16 (near, register indirect) 7 7+m 5
reg32 (near, register indirect)   7+m 5
mem16 (near, memory indirect) 11 10+m 5
mem32 (near, memory indirect)   10+m 5
... ...


EXIT, ENDP, and END


 exit
 main  ENDP
 END  main
  • statement, a command defined in , calls a pre-defined MS-Windows function that halts the program.

  • directive marks the end of the procedure.

  • directive marks the last line of the program to be assembled. It identifies the name of the program’s startup procedure.




      “My advice to you is get married:    
      If you find a good wife you’ll be happy;    
      if not, you’ll become a philosopher.”    
      — Socrates