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-rw-r--r--src/armv8/a64.rs93
1 files changed, 59 insertions, 34 deletions
diff --git a/src/armv8/a64.rs b/src/armv8/a64.rs
index 6dd9d68..0f2af3a 100644
--- a/src/armv8/a64.rs
+++ b/src/armv8/a64.rs
@@ -1,7 +1,7 @@
//#[cfg(feature="use-serde")]
//use serde::{Serialize, Deserialize};
-use std::fmt::{Display, Formatter};
+use std::fmt::{self, Display, Formatter};
use yaxpeax_arch::{Arch, ColorSettings, Decoder, LengthedInstruction, ShowContextual};
@@ -126,6 +126,34 @@ mod docs {
}
}
+#[derive(Debug, PartialEq)]
+pub enum DecodeError {
+ ExhaustedInput,
+ InvalidOpcode,
+ InvalidOperand,
+}
+
+impl fmt::Display for DecodeError {
+ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+ match self {
+ DecodeError::ExhaustedInput => write!(f, "exhausted input"),
+ DecodeError::InvalidOpcode => write!(f, "invalid opcode"),
+ DecodeError::InvalidOperand => write!(f, "invalid operand"),
+ }
+ }
+}
+
+impl yaxpeax_arch::DecodeError for DecodeError {
+ fn data_exhausted(&self) -> bool { self == &DecodeError::ExhaustedInput }
+ fn bad_opcode(&self) -> bool { self == &DecodeError::InvalidOpcode }
+ fn bad_operand(&self) -> bool { self == &DecodeError::InvalidOperand }
+}
+
+impl yaxpeax_arch::Instruction for Instruction {
+ // TODO: this is wrong!!
+ fn well_defined(&self) -> bool { true }
+}
+
#[allow(non_snake_case)]
impl <T: std::fmt::Write> ShowContextual<u64, [Option<String>], T> for Instruction {
fn contextualize(&self, _colors: Option<&ColorSettings>, _address: u64, _context: Option<&[Option<String>]>, out: &mut T) -> std::fmt::Result {
@@ -144,6 +172,7 @@ pub struct ARMv8 { }
impl Arch for ARMv8 {
type Address = u64;
type Instruction = Instruction;
+ type DecodeError = DecodeError;
type Decoder = InstDecoder;
type Operand = Operand;
}
@@ -981,29 +1010,25 @@ pub struct InstDecoder {}
#[allow(non_snake_case)]
impl Decoder<Instruction> for InstDecoder {
- fn decode<T: IntoIterator<Item=u8>>(&self, bytes: T) -> Option<Instruction> {
+ type Error = DecodeError;
+
+ fn decode<T: IntoIterator<Item=u8>>(&self, bytes: T) -> Result<Instruction, Self::Error> {
let mut blank = Instruction::blank();
- match self.decode_into(&mut blank, bytes) {
- Some(_) => Some(blank),
- None => None
- }
+ self.decode_into(&mut blank, bytes).map(|_: ()| blank)
}
- fn decode_into<T: IntoIterator<Item=u8>>(&self, inst: &mut Instruction, bytes: T) -> Option<()> {
- fn read_word<T: IntoIterator<Item=u8>>(bytes: T) -> Option<u32> {
+ fn decode_into<T: IntoIterator<Item=u8>>(&self, inst: &mut Instruction, bytes: T) -> Result<(), Self::Error> {
+ fn read_word<T: IntoIterator<Item=u8>>(bytes: T) -> Result<u32, DecodeError> {
let mut iter = bytes.into_iter();
let instr: u32 =
- ((iter.next()? as u32) ) |
- ((iter.next()? as u32) << 8 ) |
- ((iter.next()? as u32) << 16) |
- ((iter.next()? as u32) << 24);
+ ((iter.next().ok_or(DecodeError::ExhaustedInput)? as u32) ) |
+ ((iter.next().ok_or(DecodeError::ExhaustedInput)? as u32) << 8 ) |
+ ((iter.next().ok_or(DecodeError::ExhaustedInput)? as u32) << 16) |
+ ((iter.next().ok_or(DecodeError::ExhaustedInput)? as u32) << 24);
- Some(instr)
+ Ok(instr)
}
- let word = match read_word(bytes) {
- Some(word) => word,
- None => { return None; }
- };
+ let word = read_word(bytes)?;
#[derive(Copy, Clone, Debug)]
enum Section {
@@ -1079,7 +1104,7 @@ impl Decoder<Instruction> for InstDecoder {
if opc2 == 0b000000 {
inst.opcode = Opcode::Invalid;
- return Some(());
+ return Err(DecodeError::InvalidOperand);
}
let size_code = match word >> 29 {
@@ -1138,7 +1163,7 @@ impl Decoder<Instruction> for InstDecoder {
if word & 0x20000000 != 0 {
inst.opcode = Opcode::Invalid;
- return Some(());
+ return Err(DecodeError::InvalidOperand);
}
let size = match sf_op | op2 {
@@ -1183,7 +1208,7 @@ impl Decoder<Instruction> for InstDecoder {
0b1110 |
0b1111 => {
inst.opcode = Opcode::Invalid;
- return Some(());
+ return Err(DecodeError::InvalidOpcode);
},
_ => {
unreachable!("sf, op, op2 are four bits total");
@@ -1238,7 +1263,7 @@ impl Decoder<Instruction> for InstDecoder {
// technically this is undefined - do some
// cores do something with this?
inst.opcode = Opcode::Invalid;
- return None;
+ return Err(DecodeError::InvalidOperand);
}
inst.opcode = Opcode::PACIZA;
inst.operands = [
@@ -1321,7 +1346,7 @@ impl Decoder<Instruction> for InstDecoder {
if (word >> 22) & 0x03 != 0 {
inst.opcode = Opcode::Invalid;
- return None;
+ return Err(DecodeError::InvalidOperand);
}
let Rd = (word & 0x1f) as u16;
@@ -1351,7 +1376,7 @@ impl Decoder<Instruction> for InstDecoder {
let shift = (word >> 22) & 0x03;
if shift == 0b11 {
inst.opcode = Opcode::Invalid;
- return None;
+ return Err(DecodeError::InvalidOperand);
}
let Rd = (word & 0x1f) as u16;
@@ -1361,7 +1386,7 @@ impl Decoder<Instruction> for InstDecoder {
if size == SizeCode::W && imm6 >= 32 {
inst.opcode = Opcode::Invalid;
- return None;
+ return Err(DecodeError::InvalidOperand);
}
inst.operands[0] = Operand::Register(size, Rd);
@@ -1467,7 +1492,7 @@ impl Decoder<Instruction> for InstDecoder {
0b10 |
0b11 => {
inst.opcode = Opcode::Invalid;
- return None;
+ return Err(DecodeError::InvalidOperand);
}
_ => { unreachable!("shift is two bits"); }
};
@@ -1756,7 +1781,7 @@ impl Decoder<Instruction> for InstDecoder {
(0b10, 0b1) => Opcode::LDAXRB,
_ => {
inst.opcode = Opcode::Invalid;
- return None;
+ return Err(DecodeError::InvalidOpcode);
}
}
} else if size == 0b01 {
@@ -1767,7 +1792,7 @@ impl Decoder<Instruction> for InstDecoder {
(0b10, 0b1) => Opcode::LDAXRH,
_ => {
inst.opcode = Opcode::Invalid;
- return None;
+ return Err(DecodeError::InvalidOpcode);
}
}
} else {
@@ -1872,7 +1897,7 @@ impl Decoder<Instruction> for InstDecoder {
(0b11, 0b10, 0b1) => Opcode::LDAR, // 64-bit
_ => {
inst.opcode = Opcode::Invalid;
- return None;
+ return Err(DecodeError::InvalidOpcode);
}
};
let size_code = if size == 0b11 {
@@ -1939,7 +1964,7 @@ impl Decoder<Instruction> for InstDecoder {
0b11 => {
// 11011100_XXXXXXXX_XXXXXXXX_XXXXXXXX
inst.opcode = Opcode::Invalid;
- return None;
+ return Err(DecodeError::InvalidOpcode);
}
_ => {
unreachable!("opc is two bits");
@@ -2155,7 +2180,7 @@ impl Decoder<Instruction> for InstDecoder {
if word & 0x200000 != 0 {
if category != 0b10 {
inst.opcode = Opcode::Invalid;
- return Some(());
+ return Err(DecodeError::InvalidOpcode);
} else {
// Load/store register (register offset)
// C3.3.10
@@ -2236,7 +2261,7 @@ impl Decoder<Instruction> for InstDecoder {
0b00 |
0b01 => {
inst.opcode = Opcode::Invalid;
- return Some(());
+ return Err(DecodeError::InvalidOpcode);
},
0b10 => { SizeCode::W }
0b11 => { SizeCode::X }
@@ -2247,14 +2272,14 @@ impl Decoder<Instruction> for InstDecoder {
0b000 |
0b001 => {
inst.opcode = Opcode::Invalid;
- return Some(());
+ return Err(DecodeError::InvalidOpcode);
},
0b010 => { ShiftStyle::UXTW },
0b011 => { ShiftStyle::LSL },
0b100 |
0b101 => {
inst.opcode = Opcode::Invalid;
- return Some(());
+ return Err(DecodeError::InvalidOpcode);
},
0b110 => { ShiftStyle::SXTW },
0b111 => { ShiftStyle::SXTX },
@@ -3013,6 +3038,6 @@ impl Decoder<Instruction> for InstDecoder {
},
};
- Some(())
+ Ok(())
}
}
generated by cgit v1.1 at 2024-11-11 03:22:01 +0000