MIPS-Assembler

Assembler for built Processors

Consists of back-end modules for the assembler middleware. The assembler translates up to 15 instructions they include:

Instructions

R-Format

Instructions	Meaning	Opcode	Rs	Rt	Rd	shamt	Funct
		6 bits	5 bits	5 bits	5 bits	5 bits	6 bits
add rd, rs, rt	Rd = Rs + Rt	000000	sssss	ttttt	ddddd	00000	100000
sub rd, rs, rt	Rd = Rs -Rt	000000	sssss	ttttt	ddddd	00000	100010
and rd, rs, rt	Rd = Rs and Rt	000000	sssss	ttttt	ddddd	00000	100100
or rd, rs, rt	Rd = Rs or Rt	000000	sssss	ttttt	ddddd	00000	100101
slt rd, rs,rt	rs == rt ? 1:0	000000	sssss	ttttt	ddddd	00000	101010
sll rd, rs, rx	rd =rs sll rx	000000	sssss	00000	00000	xxxxxx	000000
srl rd, rs, rx	rd = rs = srl rx	000000	sssss	00000	00000	xxxxxx	000010
xor rd, rs, rt	rd = rs xor rt	000000	sssss	ttttt	ddddd	00000	100110
Jr rs	Jump to Address in register(rs) : pc = $rs	000000	ssssss	000000	000000	00000	001000

I-Format

Instructions	Meaning	Opcode	Rs	Rt	Address
		6 bits	5 bits	5 bits	16 bits
addi rs, rt, #Imm	rt = rs + Imm	001000	sssss	ttttt	Immediate(Imm)
lw rt, Offset(Address)	rt = MEM[Offset + Address]	100011	sssss	ttttt	Address
sw rt, Offset(Address)	MEM[Offset + Address] = rt	101011	sssss	ttttt	Address
beq rs, rt, Address	rs == rt ? pc = Label + (pc + 4) : pc += 4	000100	sssss	ttttt	Label

J-Format

Instructions	Meaning	Opccode	Jump Address
J Address	pc = Address	000010	Address
Jal Address	Jump and Link : $ra($31) = pc + 4 then pc = Address	000011	Address

Halt CPU

Instructrion	Meaning	Opcode	Remaining bits
		6 bits	26 bits
halt	halt the CPU	11111	(dont care)