357 lines
9.4 KiB
Rust
357 lines
9.4 KiB
Rust
use core::fmt;
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use crate::register::{Register, SegmentRegister};
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pub type Byte = u8; // b
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pub type Word = u16; // w or v
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#[derive(Debug, Clone)]
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#[allow(dead_code)]
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/// Encodes either Byte- or Word-sized operands.
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pub enum Operand {
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Byte(Byte),
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Word(Word),
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}
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impl fmt::Display for Operand {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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match self {
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Self::Byte(byte) => write!(f, "{}", byte),
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Self::Word(word) => write!(f, "{}", word),
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}
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}
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}
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impl fmt::LowerHex for Operand {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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match self {
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Self::Byte(b) => fmt::LowerHex::fmt(b, f),
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Self::Word(v) => fmt::LowerHex::fmt(v, f),
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}
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}
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}
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#[derive(Debug, Clone)]
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#[allow(dead_code)]
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/// A single 'line' of executable ASM is called an Instruction, which
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/// contains the `Mnemonic` that will be executed, alongside its starting offset
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/// and the raw parsed bytes
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pub struct Instruction {
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pub start: usize, // location of the instruction start
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pub raw: Vec<u8>, // raw value of instruction
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pub opcode: Mnemonic, // actual instruction
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}
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impl Instruction {
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pub fn new() -> Self {
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Instruction {
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start: 0,
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raw: Vec::new(),
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opcode: Mnemonic::NOP(),
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}
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}
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}
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impl fmt::Display for Instruction {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "{:04x}: ", self.start).unwrap();
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for b in self.raw.iter() {
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write!(f, "{:02x}", b).unwrap();
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}
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write!(f, "\t\t{}", self.opcode)
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}
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}
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#[derive(Debug, Clone)]
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#[allow(dead_code, non_camel_case_types)]
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/// All possible mnemonic variantions.
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/// These are sorted by type and are not in hex-encoding order.
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// XXX: convert this copy and paste horror in a proc macro like
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// enum Opcode {
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// #[derive(default_variations)]
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// ADD,
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// ...
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// }
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// which then add all variants and also create the matching logic for
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// src/disasm.rs decode_instructions()
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pub enum Mnemonic {
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NOP(),
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// ADD
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ADD_FromReg(ModRmTarget, Register), // From Register into either Memory or Register
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ADD_ToReg(ModRmTarget, Register), // From either Memory or Register into Reigster
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ADD_Ib(ModRmTarget, Byte), // From Immediate into either Memory or Register
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ADD_Iv(ModRmTarget, Word), // From Immediate into either Memory or Register
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ADD_ALIb(Byte),
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ADD_AXIv(Word),
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// PUSH
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PUSH_R(Register),
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PUSH_S(SegmentRegister),
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PUSH_Mod(ModRmTarget),
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// POP
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POP_S(SegmentRegister), // POP to Segment Register
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POP_R(Register), // POP to Register
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POP_M(MemoryIndex), // POP to Memory
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// OR
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OR_FromReg(ModRmTarget, Register),
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OR_ToReg(ModRmTarget, Register),
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OR_Ib(ModRmTarget, Byte),
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OR_Iv(ModRmTarget, Word),
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OR_ALIb(Byte),
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OR_AXIv(Word),
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// ADC
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ADC_FromReg(ModRmTarget, Register),
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ADC_ToReg(ModRmTarget, Register),
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ADC_Ib(ModRmTarget, Byte),
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ADC_Iv(ModRmTarget, Word),
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ADC_ALIb(Byte),
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ADC_AXIv(Word),
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// SBB
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SBB_FromReg(ModRmTarget, Register),
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SBB_ToReg(ModRmTarget, Register),
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SBB_Ib(ModRmTarget, Byte),
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SBB_Iv(ModRmTarget, Word),
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SBB_ALIb(Byte),
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SBB_AXIv(Word),
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// AND
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AND_FromReg(ModRmTarget, Register),
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AND_ToReg(ModRmTarget, Register),
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AND_Ib(ModRmTarget, Byte),
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AND_Iv(ModRmTarget, Word),
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AND_ALIb(Byte),
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AND_AXIv(Word),
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// Override
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OVERRIDE(SegmentRegister),
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// Decimal Adjustment
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DAA,
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DAS,
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AAA,
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AAS,
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// SUB
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SUB_FromReg(ModRmTarget, Register),
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SUB_ToReg(ModRmTarget, Register),
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SUB_Ib(ModRmTarget, Byte),
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SUB_Iv(ModRmTarget, Word),
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SUB_ALIb(Byte),
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SUB_AXIv(Word),
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// XOR
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XOR_FromReg(ModRmTarget, Register),
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XOR_ToReg(ModRmTarget, Register),
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XOR_Ib(ModRmTarget, Byte),
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XOR_Iv(ModRmTarget, Word),
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XOR_ALIb(Byte),
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XOR_AXIv(Word),
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// CMP
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CMP_FromReg(ModRmTarget, Register),
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CMP_ToReg(ModRmTarget, Register),
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CMP_Ib(ModRmTarget, Byte),
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CMP_Iv(ModRmTarget, Word),
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CMP_ALIb(Byte),
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CMP_AXIv(Word),
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// INC
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INC_Reg(Register),
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INC_Mod(ModRmTarget),
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// DEC
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DEC_Reg(Register),
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DEC_Mod(ModRmTarget),
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// Jumps
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JO(Byte),
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JNO(Byte),
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JB(Byte),
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JNB(Byte),
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JZ(Byte),
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JNZ(Byte),
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JBE(Byte),
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JA(Byte),
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JS(Byte),
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JNS(Byte),
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JPE(Byte),
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JPO(Byte),
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JL(Byte),
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JGE(Byte),
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JLE(Byte),
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JG(Byte),
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// TEST
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TEST(ModRmTarget, Register),
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TEST_Ib(ModRmTarget, Byte),
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TEST_Iv(ModRmTarget, Word),
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TEST_ALIb(Byte),
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TEST_AXIv(Word),
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//XHCG
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XHCG(ModRmTarget, Register),
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XCHG_AX(Register), // from AX
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// MOV
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MOV_FromReg(ModRmTarget, Register),
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MOV_ToReg(ModRmTarget, Register),
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MOV_FromSReg(ModRmTarget, SegmentRegister),
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MOV_ToSReg(ModRmTarget, SegmentRegister),
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MOV_AL0b(Byte),
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MOV_AX0v(Word),
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MOV_0bAL(Byte),
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MOV_0vAX(Word),
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MOV_ALIb(Byte),
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MOV_CLIb(Byte),
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MOV_DLIb(Byte),
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MOV_BLIb(Byte),
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MOV_AHIb(Byte),
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MOV_CHIb(Byte),
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MOV_DHIb(Byte),
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MOV_BHIb(Byte),
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MOV_AXIv(Word),
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MOV_CXIv(Word),
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MOV_DXIv(Word),
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MOV_BXIv(Word),
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MOV_SPIv(Word),
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MOV_BPIv(Word),
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MOV_SIIv(Word),
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MOV_DIIv(Word),
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// LEA
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LEA(ModRmTarget, Register),
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// Sign extensions
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CBW,
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CWD,
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// CALL
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CALL_p(Pointer),
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CALL_v(Word),
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CALL_Mod(ModRmTarget),
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// JUMP
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JMP_p(Pointer),
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JMP_b(Byte),
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JMP_v(Word),
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JMP_Mod(ModRmTarget),
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// WAIT
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WAIT,
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// Push/Pop Flags
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PUSHF,
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POPF,
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SAHF,
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LAHF,
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// String Byte Operations
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MOVSB,
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MOVSW,
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CMPSB,
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CMPSW,
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STOSB,
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STOSW,
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LODSB,
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LODSW,
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SCASB,
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SCASW,
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// RET
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RETIw(Word),
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RET,
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// Load ES/DS Register
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LES(ModRmTarget),
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LDS(ModRmTarget),
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// NOT
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NOT(ModRmTarget),
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// NEG
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NEG(ModRmTarget),
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// MUL
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MUL(ModRmTarget),
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IMUL(ModRmTarget),
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// DIV
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DIV(ModRmTarget),
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IDIV(ModRmTarget),
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// HALT
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HLT,
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// Shift and Rotate
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ROL_b(ModRmTarget, Byte),
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ROR_b(ModRmTarget, Byte),
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RCL_b(ModRmTarget, Byte),
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RCR_b(ModRmTarget, Byte),
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SHL_b(ModRmTarget, Byte),
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SHR_b(ModRmTarget, Byte),
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SAR_b(ModRmTarget, Byte),
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ROL_fromReg(ModRmTarget, Register),
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ROR_fromReg(ModRmTarget, Register),
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RCL_fromReg(ModRmTarget, Register),
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RCR_fromReg(ModRmTarget, Register),
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SHL_fromReg(ModRmTarget, Register),
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SHR_fromReg(ModRmTarget, Register),
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SAR_fromReg(ModRmTarget, Register),
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// INT
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INT(Byte),
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}
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impl fmt::Display for Mnemonic {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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match self {
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Self::INT(byte) => write!(f, "int, {:x}", byte),
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Self::ADD_FromReg(mem, reg) => write!(f, "add {}, {}", mem, reg),
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Self::ADD_ToReg(mem, reg) => write!(f, "add {}, {}", reg, mem),
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Self::CMP_Iv(mem, imm) => write!(f, "cmp {}, {:04x}", mem, imm),
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Self::CMP_Ib(target, imm) => write!(f, "cmp {}, {:04x}", target, imm),
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Self::LEA(mem, reg) => write!(f, "lea {}, {}", reg, mem),
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Self::MOV_BXIv(word) => write!(f, "mov bx, {:04x}", word),
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Self::MOV_FromReg(target, reg) => write!(f, "mov {}, {}", target, reg),
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Self::XOR_FromReg(mem, reg) => write!(f, "xor {}, {}", mem, reg),
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_ => write!(f, "??? ??, ??"),
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}
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}
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}
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#[derive(Debug, Clone)]
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/// ModRM byte can either target a memory location or some register
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pub enum ModRmTarget {
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Memory(MemoryIndex),
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Register(Register),
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}
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impl std::fmt::Display for ModRmTarget {
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fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
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match self {
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Self::Memory(idx) => write!(f, "{}", idx),
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Self::Register(reg) => write!(f, "{}", reg),
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}
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}
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}
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/// A memory index operand is usually created by ModRM bytes or words.
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/// e.g. [bx+si]
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#[derive(Debug, Clone)]
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pub struct MemoryIndex {
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pub base: Option<Register>,
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pub index: Option<Register>,
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pub displacement: Option<Operand>,
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}
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impl fmt::Display for MemoryIndex {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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match &self.base {
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Some(base) => match &self.index {
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Some(index) => match &self.displacement {
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Some(displacement) => {
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write!(f, "[{}+{}+{:04x}]", base, index, displacement)
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}
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None => write!(f, "[{}+{}]", base, index),
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},
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None => match &self.displacement {
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Some(displacement) => write!(f, "[{}+{:04x}]", base, displacement),
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None => write!(f, "[{}]", base),
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},
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},
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None => match &self.index {
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Some(index) => match &self.displacement {
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Some(displacement) => write!(f, "[{}+{:04x}]", index, displacement),
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None => write!(f, "[{}]", index),
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},
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None => panic!("Invalid MemoryIndex encountered"),
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},
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}
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}
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}
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#[derive(Debug, Clone)]
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/// 32-bit segment:offset pointer (e.g. for CALL instruction)
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pub struct Pointer {
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pub segment: Word,
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pub offset: Word,
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}
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impl std::fmt::Display for Pointer {
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fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
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write!(f, "{}:{}", self.segment, self.offset)
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}
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}
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