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-rw-r--r--src/protected_mode/mod.rs330
1 files changed, 199 insertions, 131 deletions
diff --git a/src/protected_mode/mod.rs b/src/protected_mode/mod.rs
index 3b14a7f..cb19afc 100644
--- a/src/protected_mode/mod.rs
+++ b/src/protected_mode/mod.rs
@@ -5546,8 +5546,8 @@ pub(self) fn read_E<
T: Reader<<Arch as yaxpeax_arch::Arch>::Address, <Arch as yaxpeax_arch::Arch>::Word>,
S: DescriptionSink<FieldDescription>
>(words: &mut T, instr: &mut Instruction, modrm: u8, width: u8, sink: &mut S) -> Result<OperandSpec, DecodeError> {
- let bank = width_to_gp_reg_bank(width);
if modrm >= 0b11000000 {
+ let bank = width_to_gp_reg_bank(width);
read_modrm_reg(instr, modrm, bank)
} else {
read_M(words, instr, modrm, sink)
@@ -6433,6 +6433,77 @@ impl fmt::Display for FieldDescription {
}
}
+fn read_opc_hotpath<
+ T: Reader<<Arch as yaxpeax_arch::Arch>::Address, <Arch as yaxpeax_arch::Arch>::Word>,
+ S: DescriptionSink<FieldDescription>,
+>(mut b: u8, mut record: OpcodeRecord, nextb: &mut u8, next_rec: &mut OpcodeRecord, words: &mut T, instruction: &mut Instruction, sink: &mut S) -> Result<Option<OperandCode>, DecodeError> {
+ if b == 0x66 {
+ sink.record((words.offset() - 1) as u32 * 8, (words.offset() - 1) as u32 * 8 + 7, FieldDescription {
+ desc: InnerDescription::Misc("operand size override (to 16 bits)"),
+ id: words.offset() as u32 * 8 - 8,
+ });
+ b = words.next().ok().ok_or(DecodeError::ExhaustedInput)?;
+ record = unsafe {
+ core::ptr::read_volatile(&OPCODES[b as usize])
+ };
+ instruction.prefixes.set_operand_size();
+ }
+
+ if let Interpretation::Instruction(opc) = record.0 {
+ if words.offset() > 1 {
+ sink.record(
+ words.offset() as u32 * 8 - 8 - 1, words.offset() as u32 * 8 - 8 - 1,
+ InnerDescription::Boundary("prefixes end")
+ .with_id(words.offset() as u32 * 8 - 9)
+ );
+ }
+ if opc != Opcode::Invalid {
+ sink.record((words.offset() - 1) as u32 * 8, (words.offset() - 1) as u32 * 8 + 7, FieldDescription {
+ desc: InnerDescription::Opcode(opc),
+ id: words.offset() as u32 * 8 - 8,
+ });
+ }
+ sink.record((words.offset() - 1) as u32 * 8, (words.offset() - 1) as u32 * 8 + 7, FieldDescription {
+ desc: InnerDescription::OperandCode(OperandCodeWrapper { code: record.1 }),
+ id: words.offset() as u32 * 8 - 8 + 1,
+ });
+ instruction.mem_size = 0;
+ instruction.operand_count = 2;
+ instruction.opcode = opc;
+ return Ok(Some(record.1));
+ } else if b == 0x0f {
+ if words.offset() > 1 {
+ sink.record(
+ words.offset() as u32 * 8 - 8 - 1, words.offset() as u32 * 8 - 8 - 1,
+ InnerDescription::Boundary("prefixes end")
+ .with_id(words.offset() as u32 * 8 - 9)
+ );
+ }
+ let b = words.next().ok().ok_or(DecodeError::ExhaustedInput)?;
+ instruction.mem_size = 0;
+ instruction.operand_count = 2;
+ let record = if b == 0x38 {
+ let b = words.next().ok().ok_or(DecodeError::ExhaustedInput)?;
+ read_0f38_opcode(b, &mut instruction.prefixes)
+ } else if b == 0x3a {
+ let b = words.next().ok().ok_or(DecodeError::ExhaustedInput)?;
+ read_0f3a_opcode(b, &mut instruction.prefixes)
+ } else {
+ read_0f_opcode(b, &mut instruction.prefixes)
+ };
+ if let Interpretation::Instruction(opc) = record.0 {
+ instruction.opcode = opc;
+ } else {
+ unsafe { unreachable_unchecked(); }
+ }
+ return Ok(Some(record.1));
+ } else {
+ *nextb = b;
+ *next_rec = record;
+ return Ok(None);
+ }
+}
+
fn read_with_annotations<
T: Reader<<Arch as yaxpeax_arch::Arch>::Address, <Arch as yaxpeax_arch::Arch>::Word>,
S: DescriptionSink<FieldDescription>,
@@ -6440,43 +6511,21 @@ fn read_with_annotations<
words.mark();
let mut nextb = words.next().ok().ok_or(DecodeError::ExhaustedInput)?;
let mut next_rec = OPCODES[nextb as usize];
- let mut prefixes = Prefixes::new(0);
+ instruction.prefixes = Prefixes::new(0);
// default registers to `[eax; 4]`
instruction.regs = unsafe { core::mem::transmute(0u64) };
- instruction.mem_size = 0;
// default operands to [RegRRR, Nothing, Nothing, Nothing]
instruction.operands = unsafe { core::mem::transmute(0x00_00_00_01) };
- instruction.operand_count = 2;
- let record: OpcodeRecord = loop {
- let record = next_rec;
- if let Interpretation::Instruction(opc) = record.0 {
- if words.offset() > 1 {
- sink.record(
- words.offset() as u32 * 8 - 8 - 1, words.offset() as u32 * 8 - 8 - 1,
- InnerDescription::Boundary("prefixes end")
- .with_id(words.offset() as u32 * 8 - 9)
- );
- }
- if opc != Opcode::Invalid {
- sink.record((words.offset() - 1) as u32 * 8, (words.offset() - 1) as u32 * 8 + 7, FieldDescription {
- desc: InnerDescription::Opcode(opc),
- id: words.offset() as u32 * 8 - 8,
- });
- }
- sink.record((words.offset() - 1) as u32 * 8, (words.offset() - 1) as u32 * 8 + 7, FieldDescription {
- desc: InnerDescription::OperandCode(OperandCodeWrapper { code: record.1 }),
- id: words.offset() as u32 * 8 - 8 + 1,
- });
- break record;
- } else {
- let b = nextb;
- if words.offset() >= 15 {
- return Err(DecodeError::TooLong);
- }
- if b == 0x0f {
+ let record: OperandCode = if let Some(rec) = read_opc_hotpath(nextb, next_rec, &mut nextb, &mut next_rec, words, instruction, sink)? {
+ rec
+ } else {
+ let prefixes = &mut instruction.prefixes;
+ let record = loop {
+ let record = next_rec;
+ if let Interpretation::Instruction(opc) = record.0 {
if words.offset() > 1 {
sink.record(
words.offset() as u32 * 8 - 8 - 1, words.offset() as u32 * 8 - 8 - 1,
@@ -6484,118 +6533,142 @@ fn read_with_annotations<
.with_id(words.offset() as u32 * 8 - 9)
);
}
- let b = words.next().ok().ok_or(DecodeError::ExhaustedInput)?;
- if b == 0x38 {
- let b = words.next().ok().ok_or(DecodeError::ExhaustedInput)?;
- break read_0f38_opcode(b, &mut prefixes);
- } else if b == 0x3a {
+ if opc != Opcode::Invalid {
+ sink.record((words.offset() - 1) as u32 * 8, (words.offset() - 1) as u32 * 8 + 7, FieldDescription {
+ desc: InnerDescription::Opcode(opc),
+ id: words.offset() as u32 * 8 - 8,
+ });
+ }
+ sink.record((words.offset() - 1) as u32 * 8, (words.offset() - 1) as u32 * 8 + 7, FieldDescription {
+ desc: InnerDescription::OperandCode(OperandCodeWrapper { code: record.1 }),
+ id: words.offset() as u32 * 8 - 8 + 1,
+ });
+ instruction.mem_size = 0;
+ instruction.operand_count = 2;
+ break record;
+ } else {
+ let b = nextb;
+ if b == 0x0f {
+ if words.offset() > 1 {
+ sink.record(
+ words.offset() as u32 * 8 - 8 - 1, words.offset() as u32 * 8 - 8 - 1,
+ InnerDescription::Boundary("prefixes end")
+ .with_id(words.offset() as u32 * 8 - 9)
+ );
+ }
let b = words.next().ok().ok_or(DecodeError::ExhaustedInput)?;
- break read_0f3a_opcode(b, &mut prefixes);
- } else {
- break read_0f_opcode(b, &mut prefixes);
+ instruction.mem_size = 0;
+ instruction.operand_count = 2;
+ if b == 0x38 {
+ let b = words.next().ok().ok_or(DecodeError::ExhaustedInput)?;
+ break read_0f38_opcode(b, prefixes);
+ } else if b == 0x3a {
+ let b = words.next().ok().ok_or(DecodeError::ExhaustedInput)?;
+ break read_0f3a_opcode(b, prefixes);
+ } else {
+ break read_0f_opcode(b, prefixes);
+ }
}
- }
-
- nextb = words.next().ok().ok_or(DecodeError::ExhaustedInput)?;
- next_rec = unsafe {
- core::ptr::read_volatile(&OPCODES[nextb as usize])
- };
- match b {
- 0x26 => {
- sink.record((words.offset() - 2) as u32 * 8, (words.offset() - 2) as u32 * 8 + 7, FieldDescription {
- desc: InnerDescription::SegmentPrefix(Segment::ES),
- id: words.offset() as u32 * 8 - 16,
- });
- prefixes.set_es();
- },
- 0x2e => {
- sink.record((words.offset() - 2) as u32 * 8, (words.offset() - 2) as u32 * 8 + 7, FieldDescription {
- desc: InnerDescription::SegmentPrefix(Segment::CS),
- id: words.offset() as u32 * 8 - 16,
- });
- prefixes.set_cs();
- },
- 0x36 => {
- sink.record((words.offset() - 2) as u32 * 8, (words.offset() - 2) as u32 * 8 + 7, FieldDescription {
- desc: InnerDescription::SegmentPrefix(Segment::SS),
- id: words.offset() as u32 * 8 - 16,
- });
- prefixes.set_ss();
- },
- 0x3e => {
- sink.record((words.offset() - 2) as u32 * 8, (words.offset() - 2) as u32 * 8 + 7, FieldDescription {
- desc: InnerDescription::SegmentPrefix(Segment::DS),
- id: words.offset() as u32 * 8 - 16,
- });
- prefixes.set_ds();
- },
- 0x64 => {
- sink.record((words.offset() - 2) as u32 * 8, (words.offset() - 2) as u32 * 8 + 7, FieldDescription {
- desc: InnerDescription::SegmentPrefix(Segment::FS),
- id: words.offset() as u32 * 8 - 16,
- });
- prefixes.set_fs();
- },
- 0x65 => {
- sink.record((words.offset() - 2) as u32 * 8, (words.offset() - 2) as u32 * 8 + 7, FieldDescription {
- desc: InnerDescription::SegmentPrefix(Segment::GS),
- id: words.offset() as u32 * 8 - 16,
- });
- prefixes.set_gs();
- },
- 0x66 => {
- sink.record((words.offset() - 2) as u32 * 8, (words.offset() - 2) as u32 * 8 + 7, FieldDescription {
+ if b == 0x66 {
+ sink.record((words.offset() - 1) as u32 * 8, (words.offset() - 1) as u32 * 8 + 7, FieldDescription {
desc: InnerDescription::Misc("operand size override (to 16 bits)"),
- id: words.offset() as u32 * 8 - 16,
+ id: words.offset() as u32 * 8 - 8,
});
prefixes.set_operand_size();
- },
- 0x67 => {
- sink.record((words.offset() - 2) as u32 * 8, (words.offset() - 2) as u32 * 8 + 7, FieldDescription {
+ } else if b == 0x67 {
+ sink.record((words.offset() - 1) as u32 * 8, (words.offset() - 1) as u32 * 8 + 7, FieldDescription {
desc: InnerDescription::Misc("address size override (to 16 bits)"),
- id: words.offset() as u32 * 8 - 16,
+ id: words.offset() as u32 * 8 - 8,
});
prefixes.set_address_size();
- },
- 0xf0 => {
- sink.record((words.offset() - 2) as u32 * 8, (words.offset() - 2) as u32 * 8 + 7, FieldDescription {
- desc: InnerDescription::Misc("lock prefix"),
- id: words.offset() as u32 * 8 - 16,
- });
- prefixes.set_lock();
- },
- 0xf2 => {
- sink.record((words.offset() - 2) as u32 * 8, (words.offset() - 2) as u32 * 8 + 7, FieldDescription {
+ } else if b == 0xf2 {
+ sink.record((words.offset() - 1) as u32 * 8, (words.offset() - 1) as u32 * 8 + 7, FieldDescription {
desc: InnerDescription::Misc("repnz prefix"),
- id: words.offset() as u32 * 8 - 16,
+ id: words.offset() as u32 * 8 - 8,
});
prefixes.set_repnz();
- },
- 0xf3 => {
- sink.record((words.offset() - 2) as u32 * 8, (words.offset() - 2) as u32 * 8 + 7, FieldDescription {
+ } else if b == 0xf3 {
+ sink.record((words.offset() - 1) as u32 * 8, (words.offset() - 1) as u32 * 8 + 7, FieldDescription {
desc: InnerDescription::Misc("rep prefix"),
- id: words.offset() as u32 * 8 - 16,
+ id: words.offset() as u32 * 8 - 8,
});
prefixes.set_rep();
- },
- _ => { unsafe { unreachable_unchecked(); } }
+ } else {
+ match b {
+ 0x26 => {
+ sink.record((words.offset() - 1) as u32 * 8, (words.offset() - 1) as u32 * 8 + 7, FieldDescription {
+ desc: InnerDescription::SegmentPrefix(Segment::ES),
+ id: words.offset() as u32 * 8 - 8,
+ });
+ prefixes.set_es();
+ },
+ 0x2e => {
+ sink.record((words.offset() - 1) as u32 * 8, (words.offset() - 1) as u32 * 8 + 7, FieldDescription {
+ desc: InnerDescription::SegmentPrefix(Segment::CS),
+ id: words.offset() as u32 * 8 - 8,
+ });
+ prefixes.set_cs();
+ },
+ 0x36 => {
+ sink.record((words.offset() - 1) as u32 * 8, (words.offset() - 1) as u32 * 8 + 7, FieldDescription {
+ desc: InnerDescription::SegmentPrefix(Segment::SS),
+ id: words.offset() as u32 * 8 - 8,
+ });
+ prefixes.set_ss();
+ },
+ 0x3e => {
+ sink.record((words.offset() - 1) as u32 * 8, (words.offset() - 1) as u32 * 8 + 7, FieldDescription {
+ desc: InnerDescription::SegmentPrefix(Segment::DS),
+ id: words.offset() as u32 * 8 - 8,
+ });
+ prefixes.set_ds();
+ },
+ 0x64 => {
+ sink.record((words.offset() - 1) as u32 * 8, (words.offset() - 1) as u32 * 8 + 7, FieldDescription {
+ desc: InnerDescription::SegmentPrefix(Segment::FS),
+ id: words.offset() as u32 * 8 - 8,
+ });
+ prefixes.set_fs();
+ },
+ 0x65 => {
+ sink.record((words.offset() - 1) as u32 * 8, (words.offset() - 1) as u32 * 8 + 7, FieldDescription {
+ desc: InnerDescription::SegmentPrefix(Segment::GS),
+ id: words.offset() as u32 * 8 - 8,
+ });
+ prefixes.set_gs();
+ },
+ 0xf0 => {
+ sink.record((words.offset() - 1) as u32 * 8, (words.offset() - 1) as u32 * 8 + 7, FieldDescription {
+ desc: InnerDescription::Misc("lock prefix"),
+ id: words.offset() as u32 * 8 - 8,
+ });
+ prefixes.set_lock();
+ },
+ // unlike 64-bit mode, the vex/evex prefixes are not recorded as prefixes -
+ // they are LES/LDS/BOUND with special-case operand decoding. so we've
+ // actually handled all possible prefixes at this point.
+ _ => { unsafe { unreachable_unchecked(); } }
+ }
+ }
+ nextb = words.next().ok().ok_or(DecodeError::ExhaustedInput)?;
+ next_rec = unsafe {
+ core::ptr::read_volatile(&OPCODES[nextb as usize])
+ };
+ }
+ if words.offset() >= 15 {
+ return Err(DecodeError::TooLong);
}
+ };
+
+ if let Interpretation::Instruction(opcode) = record.0 {
+ instruction.opcode = opcode;
+ } else {
+ unsafe { unreachable_unchecked(); }
}
+
+ record.1
};
- if record == OpcodeRecord(Interpretation::Instruction(Opcode::Invalid), OperandCode::Nothing) {
- return Err(DecodeError::InvalidOpcode);
- }
- if let Interpretation::Instruction(opcode) = record.0 {
- instruction.opcode = opcode;
- } else {
- unsafe { unreachable_unchecked(); }
- }
- instruction.prefixes = prefixes;
- read_operands(decoder, words, instruction, record.1, sink)?;
- instruction.length = words.offset() as u8;
- if instruction.length > 15 {
- return Err(DecodeError::TooLong);
- }
+ read_operands(decoder, words, instruction, record, sink)?;
if instruction.prefixes.lock() {
if !LOCKABLE_INSTRUCTIONS.contains(&instruction.opcode) || !instruction.operands[0].is_memory() {
@@ -6603,11 +6676,6 @@ fn read_with_annotations<
}
}
- if decoder != &InstDecoder::default() {
- // we might have to fix up or reject this instruction under whatever cpu features we need to
- // pretend to have.
- decoder.revise_instruction(instruction)?;
- }
Ok(())
}
/* likely cases
generated by cgit v1.1 at 2024-12-26 19:19:01 +0000