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//! # IT
//!
//! If-Then makes up to four following instructions (the IT block) conditional. The conditions for the instructions in the IT block are the same as, or the inverse of, the condition the `IT` instruction specifies for the first instruction in the block.
#![allow(non_snake_case)]
#![allow(unused)]
use crate::error::Result;
use crate::utils::*;
use super::super::formatter::*;
use super::super::instruction::*;
use super::super::operand::*;
use super::super::consts::*;
use super::super::config::*;
use super::super::decoder::*;
// ---------------------------------------------------------------------------
// Iclass IclassItT1
// ---------------------------------------------------------------------------
/// Type that represents the IclassItT1 instruction class.
pub(crate) struct IclassItT1;
impl IclassItT1 {
/// Tries to decode the instruction in `data`.
pub(crate) fn decode(data: u32, decoder: &mut Decoder) -> Result<Instruction> {
let field_11 = (data >> 8) & 15;
let field_11_post = field_11;
let firstcond = (data >> 4) & 15;
let firstcond_post = firstcond;
let mask = (data >> 0) & 15;
let mask_post = mask;
let field_15 = (data >> 12) & 15;
let field_15_post = field_15;
return ItT1::decode(data as u32, decoder);
unreachable!()
}
}
/// IT T1 encoding.
///
/// # Encoding
///
/// <table style="font-family: courier, monospace">
/// <tr>
/// <td style="border: none">15</td>
/// <td style="border: none">14</td>
/// <td style="border: none">13</td>
/// <td style="border: none">12</td>
/// <td style="border: none">11</td>
/// <td style="border: none">10</td>
/// <td style="border: none">9</td>
/// <td style="border: none">8</td>
/// <td style="border: none">7</td>
/// <td style="border: none">6</td>
/// <td style="border: none">5</td>
/// <td style="border: none">4</td>
/// <td style="border: none">3</td>
/// <td style="border: none">2</td>
/// <td style="border: none">1</td>
/// <td style="border: none">0</td>
/// </tr>
/// <tr>
/// <td style="text-align: center; border-right: none" colspan="1">1</td>
/// <td style="text-align: center; border-left: none; border-right: none" colspan="1">0</td>
/// <td style="text-align: center; border-left: none; border-right: none" colspan="1">1</td>
/// <td style="text-align: center; border-left: none" colspan="1">1</td>
/// <td style="text-align: center; border-right: none" colspan="1">1</td>
/// <td style="text-align: center; border-left: none; border-right: none" colspan="1">1</td>
/// <td style="text-align: center; border-left: none; border-right: none" colspan="1">1</td>
/// <td style="text-align: center; border-left: none" colspan="1">1</td>
/// <td style="text-align: center" colspan="4">firstcond</td>
/// <td style="text-align: center; border-right: none" colspan="4">!= 0000</td>
/// </tr>
/// <tr>
/// <td style="text-align: center; border: none" colspan="4"></td>
/// <td style="text-align: center; border: none" colspan="4"></td>
/// <td style="text-align: center; border: none" colspan="4"></td>
/// <td style="text-align: center; border: none" colspan="4">mask</td>
/// </tr>
/// </table>
pub struct ItT1;
impl ItT1 {
/// Returns the instruction mnemonic.
pub fn mnemonic(_instr: &Instruction) -> Mnemonic {
Mnemonic::IT
}
/// Returns the instruction condition information.
pub fn condition(instr: &Instruction) -> ConditionalInstruction {
ConditionalInstruction::ItBlock(
*instr.op3().as_condition().unwrap(),
*instr.op0().as_it_condition().unwrap(),
*instr.op1().as_it_condition().unwrap(),
*instr.op2().as_it_condition().unwrap()
)
}
/// Returns the instruction size.
pub fn size(_instr: &Instruction) -> usize {2}
/// Decodes the instruction in `data`.
pub fn decode(data: u32, decoder: &mut Decoder) -> Result<Instruction> {
// Fields are extracted from the input value.
let firstcond = (data >> 4) & 15;
let firstcond_post = firstcond;
let mask = (data >> 0) & 15;
let mask_post = mask;
// Compute the dependency values for the operands.
let firstcond_post = firstcond;
let mask_post = mask;
// Operand values are computed from the base fields and the dependencies.
let op_0 = ItCondition::decode(mask_post, firstcond, 1)?;
let op_1 = ItCondition::decode(mask_post, firstcond, 2)?;
let op_2 = ItCondition::decode(mask_post, firstcond, 3)?;
let op_3 = Condition::decode(firstcond_post)?;
// Instruction creation from the operands.
let mut instr = Instruction::builder(Code::IT_T1)
.operand(0, op_0)?
.operand(1, op_1)?
.operand(2, op_2)?
.operand(3, op_3)?
.build();
Ok(instr)
}
pub fn encode(instr: &Instruction, buf: &mut Vec<u8>) -> Result<usize> {
// Retrieve all operand values.
let (firstcond_pre, mask) = Self::condition(instr).encode();
// Compute all instruction fields from the operand values.
let firstcond = (firstcond_pre & 15);
// Add all fields to the base instruction encoding.
let mut instr: u32 = 0b1011111100000000;
instr |= (firstcond & 15) << 4;
instr |= (mask & 15) << 0;
let instr = instr as u16;
buf.extend(instr.to_le_bytes());
Ok(2)
}
/// Encode an instruction part of an instruction block into `buf`.
pub fn encode_block(instr: &mut Instruction, buf: &mut Vec<u8>, labels: &std::collections::HashMap<u64, u64>) -> Result<usize> {
Self::encode(instr, buf)
}
/// Verifies that operand #0 is valid.
pub fn check_op0(instr: &Instruction, op: &Operand) -> Result<()> {
if let Operand::ItCondition(it_cond) = op {
if let Operand::Condition(cond) = instr.op3() {
if *cond == Condition::Al && *it_cond == ItCondition::Else {
todo!()
}
}
return Ok(())
}
todo!()
}
/// Verifies that operand #1 is valid.
pub fn check_op1(instr: &Instruction, op: &Operand) -> Result<()> {
if let Operand::ItCondition(it_cond) = op {
if let Operand::Condition(cond) = instr.op3() {
if *cond == Condition::Al && *it_cond == ItCondition::Else {
todo!()
}
}
if let ItCondition::None = it_cond {
return Ok(())
}
if let Operand::ItCondition(prev_cond) = instr.op0() {
if let ItCondition::None = prev_cond {
todo!()
}
}
return Ok(())
}
todo!()
}
/// Verifies that operand #2 is valid.
pub fn check_op2(instr: &Instruction, op: &Operand) -> Result<()> {
if let Operand::ItCondition(it_cond) = op {
if let Operand::Condition(cond) = instr.op3() {
if *cond == Condition::Al && *it_cond == ItCondition::Else {
todo!()
}
}
if let ItCondition::None = it_cond {
return Ok(())
}
if let Operand::ItCondition(prev_cond) = instr.op1() {
if let ItCondition::None = prev_cond {
todo!()
}
}
return Ok(())
}
todo!()
}
/// Verifies that operand #3 is valid.
pub fn check_op3(instr: &Instruction, op: &Operand) -> Result<()> {
if let Operand::Condition(cond) = op {
if *cond == Condition::Al {
if let Operand::ItCondition(ItCondition::Else) = instr.op0() {
todo!()
}
if let Operand::ItCondition(ItCondition::Else) = instr.op1() {
todo!()
}
if let Operand::ItCondition(ItCondition::Else) = instr.op2() {
todo!()
}
}
return Ok(())
}
todo!()
}
/// Verifies that operand #4 is valid.
pub fn check_op4(instr: &Instruction, op: &Operand) -> Result<()> {
todo!()
}
/// Verifies that operand #5 is valid.
pub fn check_op5(instr: &Instruction, op: &Operand) -> Result<()> {
todo!()
}
/// Verifies that operand #6 is valid.
pub fn check_op6(instr: &Instruction, op: &Operand) -> Result<()> {
todo!()
}
/// Formats the instruction.
pub fn format(instr: &Instruction, fmt: &mut impl Formatter, output: &mut impl FormatterOutput, config: &Config) -> Result<()> {
fmt.format_mnemonic(output, &config.global, &config.instructions.it_t1, &instr)?;
fmt.format_operand(output, &config.global, &config.instructions.it_t1, &instr, 0)?;
fmt.format_operand(output, &config.global, &config.instructions.it_t1, &instr, 1)?;
fmt.format_operand(output, &config.global, &config.instructions.it_t1, &instr, 2)?;
fmt.format_qualifier(output, &config.global, &config.instructions.it_t1, &instr, FormatterQualifier::Narrow, false, false)?;
fmt.format_punctuation(output, &config.global, &config.instructions.it_t1, &instr, FormatterTextKind::Space)?;
fmt.format_operand(output, &config.global, &config.instructions.it_t1, &instr, 3)?;
Ok(())
}
}
/// Type that represents alias identifiers for [`ItT1`].
#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Debug, Hash)]
pub enum ItT1Aliases {
None,
}
/// Type that represents encoding identifiers for [`ItT1`].
#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Debug, Hash)]
pub enum ItT1Encodings {
None
}