SIM5 Practice                                

Like any SIM program, each of the following programs will either 

�	Execute a halt statement 
�	Execute an illegal instruction
�	Pause at an input instruction waiting for data 
�	Terminate when MAXCNT instructions have been executed. 

Assuming each of the following programs begins execution at address 000, indicate how it
will terminate (halt, illegal, wait, or MAXCNT) and specify the address in the
instruction pointer (%r9) when execution is terminated by one of the four events.
Remember that the SIM C code initializes all 1000 words of memory and the 10 processor
registers to zero. 

1. ip address __ __ __     (1) halt   (2) illegal   (3) wait   (4) MAXCNT

start:   pop   %r9
         .end  start

2. ip address __ __ __     (1) halt   (2) illegal   (3) wait   (4) MAXCNT

start:   call   %r7
         .end   start

3. ip address __ __ __     (1) halt   (2) illegal   (3) wait   (4) MAXCNT

start:   call   %r5
         .end   start

4. ip address __ __ __     (1) halt   (2) illegal   (3) wait   (4) MAXCNT

start:   push   %r9
         push   %r9
         pop    %r9
         .end   start

5. ip address __ __ __     (1) halt   (2) illegal   (3) wait   (4) MAXCNT

start:   lda    start
         call   %r0
         .end   start

6. ip address __ __ __     (1) halt   (2) illegal   (3) wait   (4) MAXCNT

start:   lda    one
         mvrr   %r0,%r1
         lda    two
         mvrr   %r0,%r2
one:     call   two
two:     call   one
        .end   start