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# QDME - Quick and Dirty MIPS Emulator
## Intro
QDME is a simple MIPS emulator written in C. Currently the binary file must be
manually created, eventually this will change. QDME will use the native byte
order of the machine. [QDMA](https://github.com/JacobMcDonnell/QDMA), the
assembler written for this emulator, also assembles based on the host byte
order.
## Instructions
|Instruction|Type|Action|
|-----------|----|------|
|add |R |rd = rs + rt|
|addu |R |rd = rs + rt|
|and |R |rd = rs & rt|
|or |R |rd = rs \| rt|
|slt |R |rd = rs < rt|
|sltu |R |rd = rs < rt|
|sub |R |rd = rs - rt|
|subu |R |rd = rs - rt|
|xor |R |rd = rs ^ rt|
|sll |R |rd = rt << shamt|
|sra |R |rd = rt >> shamt|
|srl |R |rd = rt >> shamt|
|div |R |hi = rs % rt lo = rs / rt|
|divu |R |hi = rs % rt lo = rs / rt|
|mult |R |hi, lo = rs * rt|
|multu |R |hi, lo = rs * rt|
|MFHI |R |rd = hi|
|MFLO |R |rd = lo|
|MTHI |R |rs = hi|
|MTLO |R |rs = lo|
|jr |R |pc = addr, pc = $ra|
|jalr |R |rd = pc, pc = addr|
|syscall |R |System Call|
|jal |J |$ra = pc, pc = addr|
|j |J |pc = addr|
|beq |I | pc = (rs == rt) ? imm + pc + 4 : pc|
|bne |I | pc = (rs != rt) ? imm + pc + 4 : pc|
|addi |I |rt = rs + imm|
|addiu |I |rt = rs + imm|
|andi |I |rt = rs & imm|
|ori |I |rt = rs \| imm|
|xori |I |rt = rs ^ imm|
|slti |R |rt = rs < imm|
|sltiu |R |rt = rs < imm|
|lui |I |rt = rs << 16|
|lw |I |rs = imm(rt)|
|sw |I |imm(rt) = rs|
## Syscalls
|Syscall|Action|
|-------|------|
|1 |Print integer in $a0|
|2 |Not Implemented Yet|
|3 |Not Implemented Yet|
|4 |Print Null Terminated String, address in $a0|
|5 |Read integer into $v0|
|6 |Not Implemented Yet|
|7 |Not Implemented Yet|
|8 |Read string of length $a0 into memory at $a1|
|9 |Not Implemented Yet|
|10 |Exit with Status code 0|
|11 |Print Character in $a0|
|12 |Read Character into $v0|
|13 |Not Implemented Yet|
|14 |Not Implemented Yet|
|15 |Not Implemented Yet|
|16 |Not Implemented Yet|
|17 |Exit with Status Code in $a0|
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