146 lines
4.4 KiB
Rust
146 lines
4.4 KiB
Rust
//! All types which a Mnemonic can have as some kind of operand.
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//! This includes things such as immediates, ModRM byte targets, etc. etc.
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use crate::register::Register;
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use core::fmt;
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pub type Byte = u8; // b
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pub type IByte = i8; // used for displacements of memory access
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pub type Word = u16; // w or v
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pub type IWord = i16; // used for displacement of memory access
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pub type DWord = u32;
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#[derive(Debug, Clone)]
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/// Encodes either Byte- or Word-sized operands.
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/// Also sometimes used to decide if an instruction is Byte- or Word-sized,
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/// which is usually indicated by using a value of 0 and the disregarding
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/// the value when read.
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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, PartialEq, Eq)]
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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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#[derive(Debug, Clone, PartialEq, Eq)]
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/// Memory displacements are signed versions of Byte and Word operands.
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/// Encodes either Byte- or Word-sized operands.
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pub enum Displacement {
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IByte(IByte),
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IWord(IWord),
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}
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impl fmt::LowerHex for Displacement {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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match self {
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Self::IByte(b) => fmt::LowerHex::fmt(b, f),
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Self::IWord(v) => fmt::LowerHex::fmt(v, f),
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}
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}
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}
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impl std::fmt::Display for Displacement {
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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::IByte(b) => {
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if *b > 0 {
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write!(f, " + {:#x}", b)
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} else {
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write!(f, " - {:#x}", b * -1)
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}
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}
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Self::IWord(w) => {
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if *w > 0 {
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write!(f, " + {:#x}", w)
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} else {
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write!(f, " - {:#x}", w * -1)
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}
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}
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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, PartialEq, Eq)]
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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<Displacement>,
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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, "[{} + {}{}]", 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, "[{}{}]", 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, "[{}{}]", index, displacement),
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None => write!(f, "[{}]", index),
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},
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None => match &self.displacement {
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Some(displacement) => write!(f, "[{:#x}]", displacement),
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None => panic!("Memory Index without base, index and displacement"),
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},
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},
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}
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}
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}
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#[derive(Debug, Clone, PartialEq, Eq)]
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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 raw: DWord,
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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, "[{:#04x}] ({}:{})", self.raw, self.segment, self.offset)
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}
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}
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