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//! # LDREX
//!
//! Load Register Exclusive calculates an address from a base register value and an immediate offset, loads a word from memory, writes it to a register and:
#![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 IclassLdrexA1
// ---------------------------------------------------------------------------
/// Type that represents the IclassLdrexA1 instruction class.
pub(crate) struct IclassLdrexA1;
impl IclassLdrexA1 {
/// Tries to decode the instruction in `data`.
pub(crate) fn decode(data: u32, decoder: &mut Decoder) -> Result<Instruction> {
let Rt = (data >> 12) & 15;
let Rt_post = Rt;
let size = (data >> 21) & 3;
let size_post = size;
let ord = (data >> 8) & 1;
let ord_post = ord;
let ex = (data >> 9) & 1;
let ex_post = ex;
let Rn = (data >> 16) & 15;
let Rn_post = Rn;
let field_4 = (data >> 4) & 1;
let field_4_post = field_4;
let xRt = (data >> 0) & 15;
let xRt_post = xRt;
let field_23 = (data >> 23) & 1;
let field_23_post = field_23;
let field_27 = (data >> 26) & 3;
let field_27_post = field_27;
let cond = (data >> 28) & 15;
let cond_post = cond;
let L = (data >> 20) & 1;
let L_post = L;
let field_6 = (data >> 5) & 3;
let field_6_post = field_6;
let field_25 = (data >> 24) & 3;
let field_25_post = field_25;
let field_7 = (data >> 7) & 1;
let field_7_post = field_7;
let field_11 = (data >> 10) & 3;
let field_11_post = field_11;
return LdrexA1::decode(data as u32, decoder);
unreachable!()
}
}
/// LDREX A1 encoding.
///
/// # Encoding
///
/// <table style="font-family: courier, monospace">
/// <tr>
/// <td style="border: none">31</td>
/// <td style="border: none">30</td>
/// <td style="border: none">29</td>
/// <td style="border: none">28</td>
/// <td style="border: none">27</td>
/// <td style="border: none">26</td>
/// <td style="border: none">25</td>
/// <td style="border: none">24</td>
/// <td style="border: none">23</td>
/// <td style="border: none">22</td>
/// <td style="border: none">21</td>
/// <td style="border: none">20</td>
/// <td style="border: none">19</td>
/// <td style="border: none">18</td>
/// <td style="border: none">17</td>
/// <td style="border: none">16</td>
/// <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="4">!= 1111</td>
/// <td style="text-align: center; border-right: none" colspan="1">0</td>
/// <td style="text-align: center; border-left: none" colspan="1">0</td>
/// <td style="text-align: center; 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-right: none" colspan="1">0</td>
/// <td style="text-align: center; border-left: none" colspan="1">0</td>
/// <td style="text-align: center; border-right: none" colspan="1">1</td>
/// <td style="text-align: center" colspan="4">Rn</td>
/// <td style="text-align: center" colspan="4">Rt</td>
/// <td style="text-align: center; border-right: none" colspan="3">(1)</td>
/// <td style="text-align: center; border-left: none" colspan="3">(1)</td>
/// <td style="text-align: center; border-right: none" colspan="1">1</td>
/// <td style="text-align: center; border-right: none" colspan="1">1</td>
/// <td style="text-align: center; border-right: none" colspan="1">1</td>
/// <td style="text-align: center; border-right: none" colspan="1">0</td>
/// <td style="text-align: center; border-left: none" colspan="1">0</td>
/// <td style="text-align: center; border-right: none" colspan="1">1</td>
/// <td style="text-align: center; border-right: none" colspan="3">(1)</td>
/// <td style="text-align: center; border-left: none; border-right: none" colspan="3">(1)</td>
/// <td style="text-align: center; border-left: none; border-right: none" colspan="3">(1)</td>
/// <td style="text-align: center; border-left: none" colspan="3">(1)</td>
/// </tr>
/// <tr>
/// <td style="text-align: center; border: none" colspan="4">cond</td>
/// <td style="text-align: center; border: none" colspan="2"></td>
/// <td style="text-align: center; border: none" colspan="2"></td>
/// <td style="text-align: center; border: none" colspan="1"></td>
/// <td style="text-align: center; border: none" colspan="2">size</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="4"></td>
/// <td style="text-align: center; border: none" colspan="2"></td>
/// <td style="text-align: center; border: none" colspan="1">ex</td>
/// <td style="text-align: center; border: none" colspan="1">ord</td>
/// <td style="text-align: center; border: none" colspan="1"></td>
/// <td style="text-align: center; border: none" colspan="2"></td>
/// <td style="text-align: center; border: none" colspan="1"></td>
/// <td style="text-align: center; border: none" colspan="4">xRt</td>
/// </tr>
/// </table>
pub struct LdrexA1;
impl LdrexA1 {
/// Returns the instruction mnemonic.
pub fn mnemonic(_instr: &Instruction) -> Mnemonic {
Mnemonic::LDREX
}
/// 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 {
4
}
/// Decodes the instruction in `data`.
pub fn decode(data: u32, decoder: &mut Decoder) -> Result<Instruction> {
// Fields are extracted from the input value.
let cond = (data >> 28) & 15;
let cond_post = cond;
let Rn = (data >> 16) & 15;
let Rn_post = Rn;
let Rt = (data >> 12) & 15;
let Rt_post = Rt;
// Operand values are computed from the base fields.
let cond_post = cond;
let op_0 = MnemonicCondition::decode(cond_post)?;
let Rt_post = Rt;
let op_1 = Register::decode(Rt_post)?;
let Rn_post = Rn;
let op_2 = Register::decode(Rn_post)?;
let op_3 = 0u32;
// Instruction creation from the operands.
let mut instr = Instruction::builder(Code::LDREX_A1)
.operand(0, op_0)?
.operand(1, op_1)?
.operand(2, op_2)?
.operand(3, op_3)?
.build();
Ok(instr)
}
/// Encodes the instruction into `buf`.
pub fn encode(instr: &Instruction, buf: &mut Vec<u8>) -> Result<usize> {
// Retrieve all operand values.
let cond_pre = instr.op0().as_mnemonic_condition()?.encode();
let Rt_pre = instr.op1().as_register()?.encode();
let Rn_pre = instr.op2().as_register()?.encode();
// Compute all instruction fields from the operand values.
let cond = (cond_pre & 15);
let Rt = (Rt_pre & 15);
let Rn = (Rn_pre & 15);
// Add all fields to the base instruction encoding.
let mut instr: u32 = 0b00000001100100000000111110011111;
instr |= (cond & 15) << 28;
instr |= (Rt & 15) << 12;
instr |= (Rn & 15) << 16;
let bytes = instr.to_le_bytes();
let len = bytes.len();
buf.extend(bytes);
Ok(len)
}
/// 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<()> {
if let Operand::Register(r) = op {
return Ok(())
}
todo!()
}
/// Verifies that operand #3 is valid.
pub fn check_op3(instr: &Instruction, op: &Operand) -> Result<()> {
if let Operand::UnsignedImmediate(i) = op {
if *i != 0 {
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.ldrex_a1, &instr)?;
fmt.format_operand(output, &config.global, &config.instructions.ldrex_a1, &instr, 0)?;
fmt.format_qualifier(output, &config.global, &config.instructions.ldrex_a1, &instr, FormatterQualifier::Wide, false, false)?;
fmt.format_punctuation(output, &config.global, &config.instructions.ldrex_a1, &instr, FormatterTextKind::Space)?;
fmt.format_operand(output, &config.global, &config.instructions.ldrex_a1, &instr, 1)?;
fmt.format_punctuation(output, &config.global, &config.instructions.ldrex_a1, &instr, FormatterTextKind::Comma)?;
fmt.format_punctuation(output, &config.global, &config.instructions.ldrex_a1, &instr, FormatterTextKind::BracketLeft)?;
fmt.format_operand(output, &config.global, &config.instructions.ldrex_a1, &instr, 2)?;
if instr.op3().as_unsigned_immediate()? != 0 {
fmt.format_punctuation(output, &config.global, &config.instructions.ldrex_a1, &instr, FormatterTextKind::Comma)?;
fmt.format_punctuation(output, &config.global, &config.instructions.ldrex_a1, &instr, FormatterTextKind::NumSign)?;
;
fmt.format_operand(output, &config.global, &config.instructions.ldrex_a1, &instr, 3)?;
};
fmt.format_punctuation(output, &config.global, &config.instructions.ldrex_a1, &instr, FormatterTextKind::BracketRight)?;;
Ok(())
}
}
/// Type that represents alias identifiers for [`LdrexA1`].
#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Debug, Hash)]
pub enum LdrexA1Aliases {
None,
}
/// Type that represents encoding identifiers for [`LdrexA1`].
#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Debug, Hash)]
pub enum LdrexA1Encodings {
None
}