1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
//! # CMP (immediate)
//!
//! Compare (immediate) subtracts an immediate value from a register value. It updates the condition flags based on the result, and discards the result.
#![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 IclassCmpIA1
// ---------------------------------------------------------------------------
/// Type that represents the IclassCmpIA1 instruction class.
pub(crate) struct IclassCmpIA1;
impl IclassCmpIA1 {
/// Tries to decode the instruction in `data`.
pub(crate) fn decode(data: u32, decoder: &mut Decoder) -> Result<Instruction> {
let imm12 = (data >> 0) & 4095;
let imm12_post = imm12;
let field_20 = (data >> 20) & 1;
let field_20_post = field_20;
let field_15 = (data >> 12) & 15;
let field_15_post = field_15;
let opc = (data >> 21) & 3;
let opc_post = opc;
let Rn = (data >> 16) & 15;
let Rn_post = Rn;
let field_25 = (data >> 25) & 1;
let field_25_post = field_25;
let field_27 = (data >> 26) & 3;
let field_27_post = field_27;
let field_24 = (data >> 23) & 3;
let field_24_post = field_24;
let cond = (data >> 28) & 15;
let cond_post = cond;
return CmpIA1::decode(data as u32, decoder);
unreachable!()
}
}
/// CMP 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">1</td>
/// <td style="text-align: center; border-right: none" colspan="1">1</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-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; 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; border-right: none" colspan="3">(0)</td>
/// <td style="text-align: center; border-left: none" colspan="3">(0)</td>
/// <td style="text-align: center" colspan="12">imm12</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="1"></td>
/// <td style="text-align: center; border: none" colspan="2"></td>
/// <td style="text-align: center; border: none" colspan="2">opc</td>
/// <td style="text-align: center; border: none" colspan="1"></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="12"></td>
/// </tr>
/// </table>
pub struct CmpIA1;
impl CmpIA1 {
/// Returns the instruction mnemonic.
pub fn mnemonic(_instr: &Instruction) -> Mnemonic {
Mnemonic::CMP
}
/// 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 imm12 = (data >> 0) & 4095;
let imm12_post = imm12;
// Operand values are computed from the base fields.
let cond_post = cond;
let op_0 = MnemonicCondition::decode(cond_post)?;
let Rn_post = Rn;
let op_1 = Register::decode(Rn_post)?;
let imm12_post = imm12;
let op_2 = ModifiedImmediate::decode(imm12_post);
// Instruction creation from the operands.
let mut instr = Instruction::builder(Code::CMP_i_A1)
.operand(0, op_0)?
.operand(1, op_1)?
.operand(2, op_2)?
.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 Rn_pre = instr.op1().as_register()?.encode();
let imm12_pre = instr.op2().as_modified_immediate()?.encode();
// Compute all instruction fields from the operand values.
let cond = (cond_pre & 15);
let Rn = (Rn_pre & 15);
let imm12 = (imm12_pre & 4095);
// Add all fields to the base instruction encoding.
let mut instr: u32 = 0b00000011010100000000000000000000;
instr |= (cond & 15) << 28;
instr |= (Rn & 15) << 16;
instr |= (imm12 & 4095) << 0;
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::ModifiedImmediate(i) = op {
if i.0 >= 16 {
todo!()
}
if i.1 >= 256 {
todo!()
}
return Ok(())
}
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.cmp_i_a1, &instr)?;
fmt.format_operand(output, &config.global, &config.instructions.cmp_i_a1, &instr, 0)?;
fmt.format_qualifier(output, &config.global, &config.instructions.cmp_i_a1, &instr, FormatterQualifier::Wide, false, false)?;
fmt.format_punctuation(output, &config.global, &config.instructions.cmp_i_a1, &instr, FormatterTextKind::Space)?;
fmt.format_operand(output, &config.global, &config.instructions.cmp_i_a1, &instr, 1)?;
fmt.format_punctuation(output, &config.global, &config.instructions.cmp_i_a1, &instr, FormatterTextKind::Comma)?;
fmt.format_punctuation(output, &config.global, &config.instructions.cmp_i_a1, &instr, FormatterTextKind::NumSign)?;
fmt.format_operand(output, &config.global, &config.instructions.cmp_i_a1, &instr, 2)?;
Ok(())
}
}
/// Type that represents alias identifiers for [`CmpIA1`].
#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Debug, Hash)]
pub enum CmpIA1Aliases {
None,
}
/// Type that represents encoding identifiers for [`CmpIA1`].
#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Debug, Hash)]
pub enum CmpIA1Encodings {
None
}