;     void swap (int*, int*);
;     void main (void)
;     {
;       int x = 2, y = 3;
;       swap (&x, &y);        /* swap x and y */
;     }
;     void swap (int *a, int *b)
;     {
;       int temp;
;       temp = *a;
;       *a = *b;
;       *b = temp;
;     }
        
      AREA  SwapVal, CODE, READONLY
      ENTRY
      MOV    sp, #0x00000000
	  B      main
swap  SUB    sp, sp, #4
      LDR    r1, [sp, #8]        ; get address of parameter a
      LDR    r2, [r1]            ; get value of parameter a
      STR    r2, [sp]       ; store parameter a in temp in stack frame
      LDR    r0, [sp, #4]        ; get address of parameter b
      LDR    r3, [r0]            ; get value of parameter b
      STR    r3, [r1]            ; store parameter b in parameter a
      LDR    r3, [sp]       ; get temp from stack frame
      STR    r3, [r0]            ; store temp in b
      ADD    sp, sp, #4
      MOV    pc, lr
main  SUB    sp, sp, #8
      ADR    r6, x                ; store x on the
      STR    r6, [sp, #4]        ; store &x on the stack
      ADR    r6, y
      STR    r6, [sp]        ; store &y on the stack
      BL     swap
      ADD    sp, sp, #8
Stop  B      Stop
x     DCD    2
y     DCD    3
      END