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//! # BX
//!
//! Branch and Exchange causes a branch to an address and instruction set specified by a register.
#![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 IclassBxT1
// ---------------------------------------------------------------------------
/// Type that represents the IclassBxT1 instruction class.
pub(crate) struct IclassBxT1;
impl IclassBxT1 {
/// Tries to decode the instruction in `data`.
pub(crate) fn decode(data: u32, decoder: &mut Decoder) -> Result<Instruction> {
let field_9 = (data >> 8) & 3;
let field_9_post = field_9;
let field_15 = (data >> 10) & 63;
let field_15_post = field_15;
let Rm = (data >> 3) & 15;
let Rm_post = Rm;
let field_2 = (data >> 0) & 7;
let field_2_post = field_2;
let L = (data >> 7) & 1;
let L_post = L;
return BxT1::decode(data as u32, decoder);
unreachable!()
}
}
/// BX 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">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; border-right: none" colspan="1">0</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">0</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" colspan="1">1</td>
/// <td style="text-align: center; border-right: none" colspan="1">0</td>
/// <td style="text-align: center" colspan="4">Rm</td>
/// <td style="text-align: center; border-right: none" colspan="3">(0)</td>
/// <td style="text-align: center; border-left: none; border-right: none" colspan="3">(0)</td>
/// <td style="text-align: center; border-left: none" colspan="3">(0)</td>
/// </tr>
/// <tr>
/// <td style="text-align: center; border: none" colspan="6"></td>
/// <td style="text-align: center; border: none" colspan="2"></td>
/// <td style="text-align: center; border: none" colspan="1">L</td>
/// <td style="text-align: center; border: none" colspan="4"></td>
/// <td style="text-align: center; border: none" colspan="3"></td>
/// </tr>
/// </table>
pub struct BxT1;
impl BxT1 {
/// Returns the instruction mnemonic.
pub fn mnemonic(_instr: &Instruction) -> Mnemonic {
Mnemonic::BX
}
/// Returns the instruction condition information.
pub fn condition(instr: &Instruction) -> ConditionalInstruction {
ConditionalInstruction::Condition(0, false, false)
}
/// 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 Rm = (data >> 3) & 15;
let Rm_post = Rm;
// Compute the dependency values for the operands.
let Rm_post = Rm;
// Operand values are computed from the base fields and the dependencies.
let op_0 = MnemonicCondition::Al;
let op_1 = Register::decode(Rm_post)?;
// Instruction creation from the operands.
let mut instr = Instruction::builder(Code::BX_T1)
.operand(0, op_0)?
.operand(1, op_1)?
.build();
Ok(instr)
}
pub fn encode(instr: &Instruction, buf: &mut Vec<u8>) -> Result<usize> {
// Retrieve all operand values.
let Rm_pre = instr.op1().as_register()?.encode();
// Compute all instruction fields from the operand values.
let Rm = (Rm_pre & 15);
// Add all fields to the base instruction encoding.
let mut instr: u32 = 0b0100011100000000;
instr |= (Rm & 15) << 3;
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::MnemonicCondition(r) = op {
return Ok(())
}
todo!()
}
/// Verifies that operand #1 is valid.
pub fn check_op1(instr: &Instruction, op: &Operand) -> Result<()> {
if let Operand::Register(r) = op {
return Ok(())
}
todo!()
}
/// Verifies that operand #2 is valid.
pub fn check_op2(instr: &Instruction, op: &Operand) -> Result<()> {
todo!()
}
/// Verifies that operand #3 is valid.
pub fn check_op3(instr: &Instruction, op: &Operand) -> Result<()> {
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.bx_t1, &instr)?;
fmt.format_operand(output, &config.global, &config.instructions.bx_t1, &instr, 0)?;
fmt.format_qualifier(output, &config.global, &config.instructions.bx_t1, &instr, FormatterQualifier::Narrow, false, false)?;
fmt.format_punctuation(output, &config.global, &config.instructions.bx_t1, &instr, FormatterTextKind::Space)?;
fmt.format_operand(output, &config.global, &config.instructions.bx_t1, &instr, 1)?;
Ok(())
}
}
/// Type that represents alias identifiers for [`BxT1`].
#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Debug, Hash)]
pub enum BxT1Aliases {
None,
}
/// Type that represents encoding identifiers for [`BxT1`].
#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Debug, Hash)]
pub enum BxT1Encodings {
None
}