Assembler that translates a custom assembly language into a 24-bit binary code
The binary that this assembler outputs runs on this 24-bit simple processor:
li $r0, 0 //Load 0 to register $r0
li $r1, 15 //n
li $r2, 0 //count
li $r3, 1 //Load 1 to register $r3
WHILE:
beq $r1, $r0, RETURNCOUNT
and $r4, $r1, $r3 //n & 1
add $r2, $r2, $r4 //count = count + (n&1)
srl $r1, $r1, $r3 //n >>= 1 (n = n >> 1)
jmp WHILE
RETURNCOUNT:
//Print to the terminal
li $r7, 'D'
li $r7, 'o'
li $r7, 'n'
li $r7, 'e'
li $r7, ' '
li $r7, 'c'
li $r7, 'o'
li $r7, 'u'
li $r7, 'n'
li $r7, 't'
li $r7, 'i'
li $r7, 'n'
li $r7, 'g'
li $r7, ' '
li $r7, 'n'
li $r7, 'u'
li $r7, 'm'
li $r7, 'b'
li $r7, 'e'
li $r7, 'r'
li $r7, ' '
li $r7, 'o'
li $r7, 'f'
li $r7, ' '
li $r7, 'b'
li $r7, 'i'
li $r7, 't'
li $r7, 's'
li $r7, '!'
li $r7, ' '
li $r7, 'W'
li $r7, 'a'
li $r7, 't'
li $r7, 'c'
li $r7, 'h'
li $r7, ' '
li $r7, 't'
li $r7, 'h'
li $r7, 'e'
li $r7, ' '
li $r7, 'o'
li $r7, 'u'
li $r7, 't'
li $r7, 'p'
li $r7, 'u'
li $r7, 't'
li $r7, ' '
li $r7, 'r'
li $r7, 'e'
li $r7, 's'
li $r7, ' '
li $r7, 't'
li $r7, 'o'
li $r7, ' '
li $r7, 's'
li $r7, 'e'
li $r7, 'e'
li $r7, ' '
li $r7, 't'
li $r7, 'h'
li $r7, 'e'
li $r7, ' '
li $r7, ' '
li $r7, 'r'
li $r7, 'e'
li $r7, 's'
li $r7, 'u'
li $r7, 'l'
li $r7, 't'
li $r7, ' '
li $r7, 'o'
li $r7, 'f'
li $r7, ' '
li $r7, 't'
li $r7, 'h'
li $r7, 'e'
li $r7, ' '
li $r7, 'p'
li $r7, 'r'
li $r7, 'o'
li $r7, 'g'
li $r7, 'r'
li $r7, 'a'
li $r7, 'm'
li $r7, ' '
li $r7, ' '
li $r7, '!'
li $r7, '!'
li $r7, 10 //ASCII code of endline
add $r7, $r0, $r2 //r7 = count
looper: jmp looper //Create a infinite loop in order for $r7 to keep its state
The assembler will generate a .hex file which contains the hexadecimal representation of the binary code of the assembly program which the processor understands.
