[0x00400000] 0x34080fa5 ori $8, $0, 4005 ori $8,$0,0x0FA5
Yes. How could you miss? The last 16 bits are the immediate operand.
Below is the machine code for the instruction. In the third line the bits have been grouped into fields that have various functions. Documentation for the MIPS shows the fields for each instruction. It is not something you could determine by inspection.
Look this over to get an idea of how it works. The left six bits of the instruction are the opcode, the bit pattern that specifies the machine operation. The next group of five bits specifies the operand register. The group of five after that specifies the destination register. The remaining bits are the immediate operand.
3 4 0 8 0 f a 5 -- machine instruction in hex 0011 0100 0000 1000 0000 1111 1010 0101 -- machine instruction in bits 001101 00000 01000 0000 1111 1010 0101 -- fields of the instruction ori $0 $8 0 f a 5 opcode oper- dest immediate operand -- meaning of the fields and reg. reg. ori $8, $0, 0x0fa5 -- assembly language instruction (Notice that the register numbers are not in the same order as they are in the machine instruction).
Here is the
ori instruction again,
but the patterns
that specify the operand register, the destination register,
and the immediate operand are blank.
Fill in the blanks so the operand register is
$10 , the destination register is
and the immediate operand is
001101 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ ori $10 $9 a f f 0 operand dest immediate operand reg. reg.