Machine/Binary code for Lc3

Question

Program’s machine code must begin at memory location 0x3000.

· After running program to completion, the value at memory location 0x3050 must have been rotated once to the left.

· It must be possible to rerun your program by manually resetting the PC to 0x3000. It should not require that the LC-3 be reinitialized or that any files be reloaded.

For example, suppose that, prior to running your program, memory location 0x3050 contains the value:

1001 1001 1001 1001

Then, after running your program to completion, it should contain the value:

0011 0011 0011 0011

Answer 1

0001 000 001100000 ; LEA R0, x3050

1101 0000 0000 0000 ; LDR R0, R0, #0

0101 000 000 1 00001 ; AND R1, R0, #1 (leftmost bit mask)

0001 000 0000 0011 ; ADD R0, R0, R0 (This is equivalent to left shift by 1)

0001 000 0000 0010 ; ADD R0, R0, R1

1111 0000 0011 0100 ; STR R0, PC, #34 (Store R0 at PC + 34 = x3050)

0010 000 001100000 ; LD R0, x3000 (Load address x3000 to R0)

0000 000 0000 0011 ; BR (Branch always to x3000)