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-rw-r--r--src/long_mode/mod.rs91
1 files changed, 63 insertions, 28 deletions
diff --git a/src/long_mode/mod.rs b/src/long_mode/mod.rs
index 578e2f2..f4c78c5 100644
--- a/src/long_mode/mod.rs
+++ b/src/long_mode/mod.rs
@@ -761,39 +761,35 @@ impl Operand {
}
/// return the width of this operand, in bytes. register widths are determined by the
- /// register's class.
- ///
- /// TODO: /!\ MEMORY WIDTHS ARE ALWAYS REPORTED AS 8 /!\
- pub fn width(&self) -> u8 {
+ /// register's class. the widths of memory operands are recorded on the instruction this
+ /// `Operand` came from; `None` here mans the authoritative width is `instr.mem_size()`.
+ pub fn width(&self) -> Option<u8> {
match self {
- Operand::Nothing => {
- panic!("non-operand does not have a size");
- }
Operand::Register(reg) => {
- reg.width()
+ Some(reg.width())
}
Operand::RegisterMaskMerge(reg, _, _) => {
reg.width()
}
Operand::ImmediateI8(_) |
Operand::ImmediateU8(_) => {
- 1
+ Some(1)
}
Operand::ImmediateI16(_) |
Operand::ImmediateU16(_) => {
- 2
+ Some(2)
}
Operand::ImmediateI32(_) |
Operand::ImmediateU32(_) => {
- 4
+ Some(4)
}
Operand::ImmediateI64(_) |
Operand::ImmediateU64(_) => {
- 8
+ Some(8)
}
- // memory operands
+ // memory operands or `Nothing`
_ => {
- 8
+ None
}
}
}
@@ -4169,6 +4165,23 @@ impl Default for Instruction {
}
}
+pub struct MemoryAccessSize {
+ size: u8,
+}
+impl MemoryAccessSize {
+ pub fn bytes_size(&self) -> Option<u8> {
+ if self.size == 63 {
+ None
+ } else {
+ Some(self.size)
+ }
+ }
+
+ pub fn size_name(&self) -> &'static str {
+ "name_strings"
+ }
+}
+
impl Instruction {
pub fn opcode(&self) -> Opcode {
self.opcode
@@ -4203,6 +4216,14 @@ impl Instruction {
}
}
+ pub fn mem_size(&self) -> Option<MemoryAccessSize> {
+ if self.mem_size != 0 {
+ Some(MemoryAccessSize { size: self.mem_size })
+ } else {
+ None
+ }
+ }
+
/// build a new instruction representing nothing in particular. this is primarily useful as a
/// default to pass to `decode_into`.
pub fn invalid() -> Instruction {
@@ -5589,6 +5610,7 @@ fn read_sib<T: Reader<<Arch as yaxpeax_arch::Arch>::Address, <Arch as yaxpeax_ar
}
#[allow(non_snake_case)]
+#[inline(always)]
fn read_M<T: Reader<<Arch as yaxpeax_arch::Arch>::Address, <Arch as yaxpeax_arch::Arch>::Word>>(words: &mut T, instr: &mut Instruction, modrm: u8) -> Result<OperandSpec, DecodeError> {
let modbits = modrm >> 6;
let mmm = modrm & 7;
@@ -7006,7 +7028,10 @@ fn read_instr<T: Reader<<Arch as yaxpeax_arch::Arch>::Address, <Arch as yaxpeax_
} else {
instruction.prefixes = prefixes;
vex::two_byte_vex(words, instruction)?;
-
+ instruction.length = words.offset() as u8;
+ if instruction.length > 15 {
+ return Err(DecodeError::TooLong);
+ }
if decoder != &InstDecoder::default() {
decoder.revise_instruction(instruction)?;
}
@@ -7020,6 +7045,10 @@ fn read_instr<T: Reader<<Arch as yaxpeax_arch::Arch>::Address, <Arch as yaxpeax_
} else {
instruction.prefixes = prefixes;
vex::three_byte_vex(words, instruction)?;
+ instruction.length = words.offset() as u8;
+ if instruction.length > 15 {
+ return Err(DecodeError::TooLong);
+ }
if decoder != &InstDecoder::default() {
decoder.revise_instruction(instruction)?;
}
@@ -7033,6 +7062,10 @@ fn read_instr<T: Reader<<Arch as yaxpeax_arch::Arch>::Address, <Arch as yaxpeax_
} else {
instruction.prefixes = prefixes;
evex::read_evex(words, instruction, length, None)?;
+ instruction.length = words.offset() as u8;
+ if instruction.length > 15 {
+ return Err(DecodeError::TooLong);
+ }
if decoder != &InstDecoder::default() {
decoder.revise_instruction(instruction)?;
}
@@ -7082,8 +7115,9 @@ fn read_instr<T: Reader<<Arch as yaxpeax_arch::Arch>::Address, <Arch as yaxpeax_
unsafe { unreachable_unchecked(); }
}
instruction.prefixes = prefixes;
- read_operands(decoder, bytes_iter, instruction, record.1, &mut length)?;
- if length > 15 {
+ read_operands(decoder, words, instruction, record.1)?;
+ instruction.length = words.offset() as u8;
+ if words.offset() > 15 {
return Err(DecodeError::TooLong);
}
@@ -7135,7 +7169,7 @@ fn read_instr<T: Reader<<Arch as yaxpeax_arch::Arch>::Address, <Arch as yaxpeax_
*/
#[inline(always)]
-fn read_operands<T: Reader<<Arch as yaxpeax_arch::Arch>::Address, <Arch as yaxpeax_arch::Arch>::Word>>(words: &mut T, instruction: &mut Instruction, operand_code: OperandCode) -> Result<(), DecodeError> {
+fn read_operands<T: Reader<<Arch as yaxpeax_arch::Arch>::Address, <Arch as yaxpeax_arch::Arch>::Word>>(decoder: &InstDecoder, words: &mut T, instruction: &mut Instruction, operand_code: OperandCode) -> Result<(), DecodeError> {
instruction.operands[0] = OperandSpec::RegRRR;
instruction.operand_count = 2;
let operand_code = OperandCodeBuilder::from_bits(operand_code as u16);
@@ -7640,14 +7674,15 @@ fn read_operands<T: Reader<<Arch as yaxpeax_arch::Arch>::Address, <Arch as yaxpe
},
_ => {
let operand_code: OperandCode = unsafe { core::mem::transmute(operand_code.bits()) };
- unlikely_operands(decoder, bytes_iter, instruction, operand_code, mem_oper)?;
+ unlikely_operands(decoder, words, instruction, operand_code, mem_oper)?;
}
};
}
Ok(())
}
-fn unlikely_operands<T: Iterator<Item=u8>>(decoder: &InstDecoder, mut bytes_iter: T, instruction: &mut Instruction, operand_code: OperandCode, mem_oper: OperandSpec, length: &mut u8) -> Result<(), DecodeError> {
+#[inline(never)]
+fn unlikely_operands<T: Reader<<Arch as yaxpeax_arch::Arch>::Address, <Arch as yaxpeax_arch::Arch>::Word>>(decoder: &InstDecoder, words: &mut T, instruction: &mut Instruction, operand_code: OperandCode, mem_oper: OperandSpec) -> Result<(), DecodeError> {
match operand_code {
OperandCode::G_E_mm_Ib => {
let modrm = read_modrm(words)?;
@@ -8653,7 +8688,7 @@ fn unlikely_operands<T: Iterator<Item=u8>>(decoder: &InstDecoder, mut bytes_iter
}
}
OperandCode::ModRM_0xf30f38dc => {
- read_operands(decoder, bytes_iter, instruction, OperandCode::G_E_xmm)?;
+ read_operands(decoder, words, instruction, OperandCode::G_E_xmm)?;
if let OperandSpec::RegMMM = instruction.operands[1] {
instruction.opcode = Opcode::LOADIWKEY;
} else {
@@ -8661,7 +8696,7 @@ fn unlikely_operands<T: Iterator<Item=u8>>(decoder: &InstDecoder, mut bytes_iter
}
}
OperandCode::ModRM_0xf30f38dd => {
- read_operands(decoder, bytes_iter, instruction, OperandCode::G_E_xmm)?;
+ read_operands(decoder, words, instruction, OperandCode::G_E_xmm)?;
if let OperandSpec::RegMMM = instruction.operands[1] {
return Err(DecodeError::InvalidOperand);
} else {
@@ -8669,7 +8704,7 @@ fn unlikely_operands<T: Iterator<Item=u8>>(decoder: &InstDecoder, mut bytes_iter
}
}
OperandCode::ModRM_0xf30f38de => {
- read_operands(decoder, bytes_iter, instruction, OperandCode::G_E_xmm)?;
+ read_operands(decoder, words, instruction, OperandCode::G_E_xmm)?;
if let OperandSpec::RegMMM = instruction.operands[1] {
return Err(DecodeError::InvalidOperand);
} else {
@@ -8677,7 +8712,7 @@ fn unlikely_operands<T: Iterator<Item=u8>>(decoder: &InstDecoder, mut bytes_iter
}
}
OperandCode::ModRM_0xf30f38df => {
- read_operands(decoder, bytes_iter, instruction, OperandCode::G_E_xmm)?;
+ read_operands(decoder, words, instruction, OperandCode::G_E_xmm)?;
if let OperandSpec::RegMMM = instruction.operands[1] {
return Err(DecodeError::InvalidOperand);
} else {
@@ -8686,13 +8721,13 @@ fn unlikely_operands<T: Iterator<Item=u8>>(decoder: &InstDecoder, mut bytes_iter
}
OperandCode::ModRM_0xf30f38fa => {
instruction.opcode = Opcode::ENCODEKEY128;
- read_operands(decoder, bytes_iter, instruction, OperandCode::G_U_xmm)?;
+ read_operands(decoder, words, instruction, OperandCode::G_U_xmm)?;
instruction.modrm_rrr.bank = RegisterBank::D;
instruction.modrm_mmm.bank = RegisterBank::D;
}
OperandCode::ModRM_0xf30f38fb => {
instruction.opcode = Opcode::ENCODEKEY256;
- read_operands(decoder, bytes_iter, instruction, OperandCode::G_U_xmm)?;
+ read_operands(decoder, words, instruction, OperandCode::G_U_xmm)?;
instruction.modrm_rrr.bank = RegisterBank::D;
instruction.modrm_mmm.bank = RegisterBank::D;
}
@@ -9947,7 +9982,7 @@ fn unlikely_operands<T: Iterator<Item=u8>>(decoder: &InstDecoder, mut bytes_iter
OperandCode::x87_dd |
OperandCode::x87_de |
OperandCode::x87_df => {
- return decode_x87(decoder, bytes_iter, instruction, operand_code);
+ return decode_x87(words, instruction, operand_code);
}
OperandCode::MOVDIR64B => {
// at this point we've done a read as if it was Gv_M (`lea` operands). because the
@@ -9991,7 +10026,7 @@ fn unlikely_operands<T: Iterator<Item=u8>>(decoder: &InstDecoder, mut bytes_iter
Ok(())
}
-fn decode_x87<T: Iterator<Item=u8>>(_decoder: &InstDecoder, mut bytes_iter: T, instruction: &mut Instruction, operand_code: OperandCode, length: &mut u8) -> Result<(), DecodeError> {
+fn decode_x87<T: Reader<<Arch as yaxpeax_arch::Arch>::Address, <Arch as yaxpeax_arch::Arch>::Word>>(words: &mut T, instruction: &mut Instruction, operand_code: OperandCode) -> Result<(), DecodeError> {
#[allow(non_camel_case_types)]
enum OperandCodeX87 {
Est,
generated by cgit v1.1 at 2025-11-04 14:19:55 +0000