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diff --git a/README.md b/README.md new file mode 100755 index 0000000..fc47712 --- /dev/null +++ b/README.md @@ -0,0 +1,54 @@ +# QDMA - Quick and Dirty MIPS Assembler + +## Intro + +QDMA is a simple MIPS assembler written in Go for +[QDME](https://github.com/JacobMcDonnell/QDME), which is my simple MIPS +emulator. Currently this assembler can only handle standard instructions, +which means no sections and no predefined data outside of an I-Type +instruction. + +## Instructions + +Here is a list of supported 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| + |