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authoriximeow <me@iximeow.net>2019-06-16 19:48:28 -0700
committeriximeow <me@iximeow.net>2020-01-12 17:28:07 -0800
commitc3c921435028e42abdd25268ebf546337ecfb755 (patch)
tree0073bd31b722aca4176a0e891faf1c56403f7345 /src/armv8/a64.rs
parent40a6f250cc1a879840099f38d6d5f27e658a7344 (diff)
add armv8/a64 support
Diffstat (limited to 'src/armv8/a64.rs')
-rw-r--r--src/armv8/a64.rs2734
1 files changed, 2734 insertions, 0 deletions
diff --git a/src/armv8/a64.rs b/src/armv8/a64.rs
new file mode 100644
index 0000000..e3953e3
--- /dev/null
+++ b/src/armv8/a64.rs
@@ -0,0 +1,2734 @@
+#[cfg(feature="use-serde")]
+use serde::{Serialize, Deserialize};
+
+use std::fmt::{Display, Formatter};
+
+use yaxpeax_arch::{Arch, Colorize, Colored, ColorSettings, Decodable, LengthedInstruction, ShowContextual, YaxColors};
+
+mod docs {
+ #[test]
+ fn test_ones() {
+ assert_eq!(Ones(0), 0x00);
+ assert_eq!(Ones(1), 0x01);
+ assert_eq!(Ones(2), 0x03);
+ assert_eq!(Ones(3), 0x07);
+ assert_eq!(Ones(4), 0x0f);
+ assert_eq!(Ones(5), 0x1f);
+ assert_eq!(Ones(6), 0x3f);
+ assert_eq!(Ones(7), 0x7f);
+ assert_eq!(Ones(8), 0xff);
+ }
+
+ fn Ones(len: u8) -> u64 {
+ assert!(len <= 64);
+
+ if len == 0 { return 0; }
+ if len == 64 { return 0xffffffff_ffffffffu64; }
+
+ let mask = (0x8000_0000_0000_0000i64 >> ((64 - 1) - len)) as u64;
+ !mask
+ }
+
+ #[test]
+ fn test_highest_set_bit() {
+ assert_eq!(HighestSetBit(1, 0x11), 0);
+ assert_eq!(HighestSetBit(5, 0x11), 4);
+ assert_eq!(HighestSetBit(8, 0x08), 3);
+ }
+
+ fn HighestSetBit(N: u8, bits: u64) -> u8 {
+ let mut probe = 1u64 << (N - 1);
+ let mut i = N - 1;
+ loop {
+ if bits & probe != 0 {
+ return i;
+ }
+
+ if i == 0 {
+ break;
+ } else {
+ probe = probe >> 1;
+ i -= 1;
+ }
+ }
+
+ return 0xff;
+ }
+
+ fn Replicate(bitsM: u64, M_size: u8, N: u8) -> u64 {
+ let count = N / M_size;
+ let mut res = bitsM;
+ for i in 1..count {
+ res |= bitsM << M_size * i;
+ }
+ // since this produces a u64, we might have a few extra non-zero bits set.
+ let res_mask = Ones(N);
+ res & res_mask
+ }
+
+ fn ROR(bits: u64, bitsN: u8, shift: u8) -> u64 {
+ if shift == 0 {
+ bits
+ } else {
+ let m = shift % bitsN;
+ (bits >> m) | (bits << (bitsN - m))
+ }
+ }
+
+ // helper functions from the ARMv8 Architecture Reference Manual
+ pub fn DecodeBitMasks_32(immN: u8, imms: u8, immr: u8) -> (u32, u32) {
+ // should the !imms be ~imms
+ let len = HighestSetBit(7, ((immN << 6) | ((!imms) & 0x3f)) as u64);
+
+ let levels = (Ones(len) & 0x3f) as u8; // should ZeroExtend to at least 6 bits, but this is u8.
+
+ let S = imms & levels;
+ let R = immr & levels;
+ let diff = S.wrapping_sub(R);
+
+ let esize = 1 << len;
+ let d = diff & !(0xff << len);
+ let welem = Ones(S + 1);
+ let telem = Ones(d + 1);
+ let wmask = Replicate(ROR(welem, esize, R), esize, 32) as u32;
+ let tmask = Replicate(telem, esize, 32) as u32;
+ (wmask, tmask)
+ }
+
+ pub fn DecodeBitMasks_64(immN: u8, imms: u8, immr: u8) -> (u64, u64) {
+ // should the !imms be ~imms
+ let len = HighestSetBit(7, ((immN << 6) | ((!imms) & 0x3f)) as u64);
+
+ let levels = (Ones(len) & 0x3f) as u8; // should ZeroExtend to at least 6 bits, but this is u8.
+
+ let S = imms & levels;
+ let R = immr & levels;
+ let diff = S.wrapping_sub(R);
+
+ let esize = 1 << len;
+ let d = diff & !(0xff << len);
+ let welem = Ones(S + 1);
+ let telem = Ones(d + 1);
+ let wmask = Replicate(ROR(welem, esize, R), esize, 64);
+ let tmask = Replicate(telem, esize, 64);
+ (wmask, tmask)
+ }
+}
+
+#[derive(Copy, Clone, Debug)]
+pub struct ARMv8 { }
+
+impl Arch for ARMv8 {
+ type Address = u64;
+ type Instruction = Instruction;
+ type Operand = Operand;
+}
+
+#[derive(Copy, Clone, Debug, PartialEq)]
+pub enum SizeCode { X, W }
+
+#[derive(Copy, Clone, Debug, PartialEq)]
+pub struct Instruction {
+ pub opcode: Opcode,
+ pub operands: [Operand; 4],
+}
+
+impl Display for Instruction {
+ fn fmt(&self, fmt: &mut Formatter) -> std::fmt::Result {
+ match self.opcode {
+ Opcode::Invalid => {
+ write!(fmt, "invalid")?;
+ },
+ Opcode::MOVN => {
+ write!(fmt, "movn")?;
+ },
+ Opcode::MOVK => {
+ write!(fmt, "movk")?;
+ },
+ Opcode::MOVZ => {
+ write!(fmt, "movz")?;
+ },
+ Opcode::ADC => {
+ write!(fmt, "adc")?;
+ },
+ Opcode::ADCS => {
+ write!(fmt, "adcs")?;
+ },
+ Opcode::SBC => {
+ write!(fmt, "sbc")?;
+ },
+ Opcode::SBCS => {
+ write!(fmt, "sbcs")?;
+ },
+ Opcode::AND => {
+ write!(fmt, "and")?;
+ },
+ Opcode::ORR => {
+ write!(fmt, "orr")?;
+ },
+ Opcode::EOR => {
+ write!(fmt, "eor")?;
+ },
+ Opcode::ANDS => {
+ write!(fmt, "ands")?;
+ },
+ Opcode::ADDS => {
+ write!(fmt, "adds")?;
+ },
+ Opcode::ADD => {
+ if let Operand::Immediate(0) = self.operands[2] {
+ if let Operand::Register(_, 31) = self.operands[0] {
+ return write!(fmt, "mov {}, {}", self.operands[0], self.operands[1]);
+ } else if let Operand::RegisterOrSP(_, 31) = self.operands[1] {
+ return write!(fmt, "mov {}, {}", self.operands[0], self.operands[1]);
+ }
+ }
+ write!(fmt, "add")?;
+ },
+ Opcode::SUBS => {
+ if let Operand::Register(_, 31) = self.operands[0] {
+ return write!(fmt, "cmp {}, {}", self.operands[1], self.operands[2])
+ }
+ write!(fmt, "subs")?;
+ },
+ Opcode::SUB => {
+ write!(fmt, "sub")?;
+ },
+ Opcode::BFM => {
+ write!(fmt, "bfm")?;
+ },
+ Opcode::UBFM => {
+ write!(fmt, "ubfm")?;
+ },
+ Opcode::SBFM => {
+ if let Operand::Immediate(0) = self.operands[2] {
+ if let Operand::Immediate(7) = self.operands[3] {
+ return write!(fmt, "sxtb {}, {}", self.operands[0], self.operands[1]);
+ } else if let Operand::Immediate(15) = self.operands[3] {
+ return write!(fmt, "sxth {}, {}", self.operands[0], self.operands[1]);
+ } else if let Operand::Immediate(31) = self.operands[3] {
+ return write!(fmt, "sxtw {}, {}", self.operands[0], self.operands[1]);
+ }
+ } else if let Operand::Immediate(63) = self.operands[3] {
+ if let Operand::Register(SizeCode::X, _) = self.operands[0] {
+ return write!(fmt, "asr {}, {}, {}", self.operands[0], self.operands[1], self.operands[2]);
+ }
+ } else if let Operand::Immediate(31) = self.operands[3] {
+ if let Operand::Register(SizeCode::W, _) = self.operands[0] {
+ return write!(fmt, "asr {}, {}, {}", self.operands[0], self.operands[1], self.operands[2]);
+ }
+ }
+ write!(fmt, "sbfm")?;
+ },
+ Opcode::ADR => {
+ write!(fmt, "adr")?;
+ },
+ Opcode::ADRP => {
+ write!(fmt, "adrp")?;
+ },
+ Opcode::EXTR => {
+ write!(fmt, "extr")?;
+ },
+ Opcode::LDP => {
+ write!(fmt, "ldp")?;
+ },
+ Opcode::LDPSW => {
+ write!(fmt, "ldpsw")?;
+ },
+ Opcode::LDR => {
+ write!(fmt, "ldr")?;
+ },
+ Opcode::LDRB => {
+ write!(fmt, "ldrb")?;
+ },
+ Opcode::LDRSB => {
+ write!(fmt, "ldrsb")?;
+ },
+ Opcode::LDRSH => {
+ write!(fmt, "ldrsh")?;
+ },
+ Opcode::LDRSW => {
+ write!(fmt, "ldrsw")?;
+ },
+ Opcode::LDRH => {
+ write!(fmt, "ldrh")?;
+ },
+ Opcode::LDTR => {
+ write!(fmt, "ldtr")?;
+ },
+ Opcode::LDTRB => {
+ write!(fmt, "ldtrb")?;
+ },
+ Opcode::LDTRSB => {
+ write!(fmt, "ldtrsb")?;
+ },
+ Opcode::LDTRSH => {
+ write!(fmt, "ldtrsh")?;
+ },
+ Opcode::LDTRSW => {
+ write!(fmt, "ldtrsw")?;
+ },
+ Opcode::LDTRH => {
+ write!(fmt, "ldtrh")?;
+ },
+ Opcode::LDUR => {
+ write!(fmt, "ldur")?;
+ },
+ Opcode::LDURB => {
+ write!(fmt, "ldurb")?;
+ },
+ Opcode::LDURSB => {
+ write!(fmt, "ldursb")?;
+ },
+ Opcode::LDURSW => {
+ write!(fmt, "ldursw")?;
+ },
+ Opcode::LDURSH => {
+ write!(fmt, "ldursh")?;
+ },
+ Opcode::LDURH => {
+ write!(fmt, "ldurh")?;
+ },
+ Opcode::LDAR => {
+ write!(fmt, "ldar")?;
+ },
+ Opcode::LDARB => {
+ write!(fmt, "ldarb")?;
+ },
+ Opcode::LDAXRB => {
+ write!(fmt, "ldaxrb")?;
+ },
+ Opcode::LDARH => {
+ write!(fmt, "ldarh")?;
+ },
+ Opcode::LDAXP => {
+ write!(fmt, "ldaxp")?;
+ },
+ Opcode::LDAXR => {
+ write!(fmt, "ldaxr")?;
+ },
+ Opcode::LDAXRH => {
+ write!(fmt, "ldaxrh")?;
+ },
+ Opcode::LDXP => {
+ write!(fmt, "ldxp")?;
+ },
+ Opcode::LDXR => {
+ write!(fmt, "ldxr")?;
+ },
+ Opcode::LDXRB => {
+ write!(fmt, "ldxrb")?;
+ },
+ Opcode::LDXRH => {
+ write!(fmt, "ldxrh")?;
+ },
+ Opcode::STP => {
+ write!(fmt, "stp")?;
+ },
+ Opcode::STR => {
+ write!(fmt, "str")?;
+ },
+ Opcode::STRB => {
+ write!(fmt, "strb")?;
+ },
+ Opcode::STRH => {
+ write!(fmt, "strh")?;
+ },
+ Opcode::STRW => {
+ write!(fmt, "strw")?;
+ },
+ Opcode::STTR => {
+ write!(fmt, "sttr")?;
+ },
+ Opcode::STTRB => {
+ write!(fmt, "sttrb")?;
+ },
+ Opcode::STTRH => {
+ write!(fmt, "sttrh")?;
+ },
+ Opcode::STUR => {
+ write!(fmt, "stur")?;
+ },
+ Opcode::STURB => {
+ write!(fmt, "sturb")?;
+ },
+ Opcode::STURH => {
+ write!(fmt, "sturh")?;
+ },
+ Opcode::STLR => {
+ write!(fmt, "stlr")?;
+ },
+ Opcode::STLRB => {
+ write!(fmt, "stlrb")?;
+ },
+ Opcode::STLRH => {
+ write!(fmt, "stlrh")?;
+ },
+ Opcode::STLXP => {
+ write!(fmt, "stlxp")?;
+ },
+ Opcode::STLXR => {
+ write!(fmt, "stlxr")?;
+ },
+ Opcode::STLXRB => {
+ write!(fmt, "stlxrb")?;
+ },
+ Opcode::STLXRH => {
+ write!(fmt, "stlxrh")?;
+ },
+ Opcode::STXP => {
+ write!(fmt, "stxp")?;
+ },
+ Opcode::STXR => {
+ write!(fmt, "stxr")?;
+ },
+ Opcode::STXRB => {
+ write!(fmt, "stxrb")?;
+ },
+ Opcode::STXRH => {
+ write!(fmt, "stxrh")?;
+ },
+ Opcode::TBZ => {
+ write!(fmt, "tbz")?;
+ },
+ Opcode::TBNZ => {
+ write!(fmt, "tbnz")?;
+ },
+ Opcode::CBZ => {
+ write!(fmt, "cbz")?;
+ },
+ Opcode::CBNZ => {
+ write!(fmt, "cbnz")?;
+ },
+ Opcode::B => {
+ write!(fmt, "b")?;
+ },
+ Opcode::BR => {
+ write!(fmt, "br")?;
+ },
+ Opcode::Bcc(cond) => {
+ write!(fmt, "b.{}", Operand::ConditionCode(cond))?;
+ },
+ Opcode::BL => {
+ write!(fmt, "bl")?;
+ },
+ Opcode::BLR => {
+ write!(fmt, "blr")?;
+ },
+ Opcode::SVC => {
+ write!(fmt, "svc")?;
+ },
+ Opcode::HVC => {
+ write!(fmt, "hvc")?;
+ },
+ Opcode::SMC => {
+ write!(fmt, "smc")?;
+ },
+ Opcode::BRK => {
+ write!(fmt, "brk")?;
+ },
+ Opcode::HLT => {
+ write!(fmt, "hlt")?;
+ },
+ Opcode::DCPS1 => {
+ write!(fmt, "dcps1")?;
+ },
+ Opcode::DCPS2 => {
+ write!(fmt, "dcps2")?;
+ },
+ Opcode::DCPS3 => {
+ write!(fmt, "dcps3")?;
+ },
+ Opcode::RET => {
+ write!(fmt, "ret")?;
+ if let Operand::Register(SizeCode::X, 30) = self.operands[0] {
+ // C5.6.148: Defaults to X30 if absent.
+ // so ret x30 is probably expected to be read as just `ret`
+ return Ok(());
+ }
+ },
+ Opcode::ERET => {
+ write!(fmt, "eret")?;
+ },
+ Opcode::DRPS => {
+ write!(fmt, "drps")?;
+ },
+ Opcode::MSRa(a, b) => {
+ write!(fmt, "msr(a) {}, {}", a, b)?;
+ }
+ Opcode::MSRb(a) => {
+ write!(fmt, "msr(b) {:#x}", a)?;
+ }
+ Opcode::MRS(v) => {
+ write!(fmt, "mrs({:#x})", v)?;
+ }
+ Opcode::SYS => {
+ write!(fmt, "sys")?;
+ }
+ Opcode::SYSL => {
+ write!(fmt, "sys")?;
+ }
+ Opcode::ISB => {
+ write!(fmt, "isb")?;
+ }
+ Opcode::DSB => {
+ write!(fmt, "dsb")?;
+ }
+ Opcode::DMB => {
+ write!(fmt, "dmb")?;
+ }
+ Opcode::HINT(v) => {
+ match v {
+ 0 => { write!(fmt, "nop")?; },
+ 1 => { write!(fmt, "yield")?; },
+ 2 => { write!(fmt, "wfe")?; },
+ 3 => { write!(fmt, "wfi")?; },
+ 4 => { write!(fmt, "sev")?; },
+ 5 => { write!(fmt, "sevl")?; },
+ _ => { write!(fmt, "hint({:#x})", v)?; }
+ }
+ }
+ Opcode::CLREX => {
+ write!(fmt, "clrex")?;
+ }
+ Opcode::CSEL => {
+ write!(fmt, "csel")?;
+ }
+ Opcode::CSNEG => {
+ write!(fmt, "csneg")?;
+ }
+ Opcode::CSINC => {
+ match (self.operands[1], self.operands[2], self.operands[3]) {
+ (Operand::Register(_, n), Operand::Register(_, m), Operand::ConditionCode(cond)) => {
+ if n == m && cond < 0b1110 {
+ if n == 31 {
+ return write!(fmt, "cset {}, {}", self.operands[0], Operand::ConditionCode(cond ^ 0x01));
+ } else {
+ return write!(fmt, "cinc {}, {}, {}", self.operands[0], self.operands[1], Operand::ConditionCode(cond ^ 0x01));
+ }
+ }
+ }
+ _ => {}
+ }
+ write!(fmt, "csinc")?;
+ }
+ Opcode::CSINV => {
+ match (self.operands[1], self.operands[2], self.operands[3]) {
+ (Operand::Register(_, n), Operand::Register(_, m), Operand::ConditionCode(cond)) => {
+ if n == m && n != 31 && cond < 0b1110 {
+ return write!(fmt, "cinv {}, {}, {}", self.operands[0], self.operands[1], Operand::ConditionCode(cond ^ 0x01))
+ }
+ }
+ _ => {}
+ }
+ write!(fmt, "csinv")?;
+ }
+ };
+
+ if self.operands[0] != Operand::Nothing {
+ write!(fmt, " {}", self.operands[0]);
+ } else {
+ return Ok(());
+ }
+
+ if self.operands[1] != Operand::Nothing {
+ write!(fmt, ", {}", self.operands[1]);
+ } else {
+ return Ok(());
+ }
+
+ if self.operands[2] != Operand::Nothing {
+ write!(fmt, ", {}", self.operands[2]);
+ } else {
+ return Ok(());
+ }
+
+ if self.operands[3] != Operand::Nothing {
+ write!(fmt, ", {}", self.operands[3]);
+ } else {
+ return Ok(());
+ }
+
+ Ok(())
+ }
+}
+
+impl LengthedInstruction for Instruction {
+ type Unit = <ARMv8 as Arch>::Address;
+ fn len(&self) -> Self::Unit { 4 }
+ fn min_size() -> Self::Unit { 4 }
+}
+
+impl Instruction {
+ pub fn blank() -> Self {
+ Instruction {
+ opcode: Opcode::Invalid,
+ operands: [Operand::Nothing, Operand::Nothing, Operand::Nothing, Operand::Nothing]
+ }
+ }
+}
+
+#[derive(Copy, Clone, Debug, PartialEq)]
+pub enum Opcode {
+ Invalid,
+ MOVN,
+ MOVK,
+ MOVZ,
+ ADC,
+ ADCS,
+ SBC,
+ SBCS,
+ AND,
+ ORR,
+ EOR,
+ ANDS,
+ ADDS,
+ ADD,
+ SUBS,
+ SUB,
+ BFM,
+ UBFM,
+ SBFM,
+ ADR,
+ ADRP,
+ EXTR,
+ LDAR,
+ LDARB,
+ LDAXRB,
+ LDARH,
+ LDAXP,
+ LDAXR,
+ LDAXRH,
+ LDP,
+ LDPSW,
+ LDR,
+ LDRB,
+ LDRSB,
+ LDRSW,
+ LDRSH,
+ LDRH,
+ LDTR,
+ LDTRB,
+ LDTRH,
+ LDTRSB,
+ LDTRSH,
+ LDTRSW,
+ LDUR,
+ LDURB,
+ LDURSB,
+ LDURSW,
+ LDURSH,
+ LDURH,
+ LDXP,
+ LDXR,
+ LDXRB,
+ LDXRH,
+ STLR,
+ STLRB,
+ STLRH,
+ STLXP,
+ STLXR,
+ STLXRB,
+ STLXRH,
+ STP,
+ STR,
+ STTR,
+ STTRB,
+ STTRH,
+ STRB,
+ STRH,
+ STRW,
+ STUR,
+ STURB,
+ STURH,
+ STXP,
+ STXR,
+ STXRB,
+ STXRH,
+ TBZ,
+ TBNZ,
+ CBZ,
+ CBNZ,
+ B,
+ BR,
+ Bcc(u8),
+ BL,
+ BLR,
+ SVC,
+ HVC,
+ SMC,
+ BRK,
+ HLT,
+ DCPS1,
+ DCPS2,
+ DCPS3,
+ RET,
+ ERET,
+ DRPS,
+ MSRa(u8, u8),
+ MSRb(u32),
+ MRS(u32),
+ SYS,
+ SYSL,
+ ISB,
+ DSB,
+ DMB,
+ HINT(u8),
+ CLREX,
+ CSEL,
+ CSNEG,
+ CSINC,
+ CSINV,
+}
+
+#[derive(Copy, Clone, Debug, PartialEq)]
+pub enum ShiftStyle {
+ LSL,
+ LSR,
+ ASR,
+ UXTB,
+ UXTH,
+ UXTW,
+ UXTX,
+ SXTB,
+ SXTH,
+ SXTW,
+ SXTX,
+}
+
+impl Display for ShiftStyle {
+ fn fmt(&self, fmt: &mut std::fmt::Formatter) -> std::fmt::Result {
+ match self {
+ ShiftStyle::LSL => { write!(fmt, "lsl") },
+ ShiftStyle::LSR => { write!(fmt, "lsr") },
+ ShiftStyle::ASR => { write!(fmt, "asr") },
+ ShiftStyle::UXTB => { write!(fmt, "uxtb") },
+ ShiftStyle::UXTH => { write!(fmt, "uxth") },
+ ShiftStyle::UXTW => { write!(fmt, "uxtw") },
+ ShiftStyle::UXTX => { write!(fmt, "uxtx") },
+ ShiftStyle::SXTB => { write!(fmt, "sxtb") },
+ ShiftStyle::SXTH => { write!(fmt, "sxth") },
+ ShiftStyle::SXTW => { write!(fmt, "sxtw") },
+ ShiftStyle::SXTX => { write!(fmt, "sxtx") },
+ }
+ }
+}
+
+#[derive(Copy, Clone, Debug, PartialEq)]
+pub enum Operand {
+ Nothing,
+ Register(SizeCode, u16),
+ RegisterOrSP(SizeCode, u16),
+ ConditionCode(u8),
+ Offset(u32),
+ PCOffset(u32),
+ Immediate(u32),
+ Imm64(u64),
+ Imm16(u16),
+ ImmShift(u16, u8),
+ RegShift(ShiftStyle, u8, SizeCode, u16),
+ RegOffset(u16, i16),
+ RegRegOffset(u16, SizeCode, u16, ShiftStyle, u8),
+ RegPreIndex(u16, i16),
+ RegPostIndex(u16, i16),
+}
+
+impl Display for Operand {
+ fn fmt(&self, fmt: &mut Formatter) -> std::fmt::Result {
+ match self {
+ Operand::Nothing => {
+ unreachable!();
+ },
+ Operand::Register(size, reg) => {
+ if *reg == 31 {
+ match size {
+ SizeCode::X => {
+ write!(fmt, "xzr")
+ },
+ SizeCode::W => {
+ write!(fmt, "wzr")
+ }
+ }
+ } else {
+ match size {
+ SizeCode::X => {
+ write!(fmt, "x{}", reg)
+ },
+ SizeCode::W => {
+ write!(fmt, "w{}", reg)
+ }
+ }
+ }
+ },
+ Operand::RegisterOrSP(size, reg) => {
+ if *reg == 31 {
+ match size {
+ SizeCode::X => {
+ write!(fmt, "sp")
+ },
+ SizeCode::W => {
+ write!(fmt, "wsp")
+ }
+ }
+ } else {
+ match size {
+ SizeCode::X => {
+ write!(fmt, "x{}", reg)
+ },
+ SizeCode::W => {
+ write!(fmt, "w{}", reg)
+ }
+ }
+ }
+ },
+ Operand::ConditionCode(cond) => {
+ match cond {
+ 0b0000 => { write!(fmt, "eq") }
+ 0b0010 => { write!(fmt, "hs") }
+ 0b0100 => { write!(fmt, "mi") }
+ 0b0110 => { write!(fmt, "vs") }
+ 0b1000 => { write!(fmt, "hi") }
+ 0b1010 => { write!(fmt, "ge") }
+ 0b1100 => { write!(fmt, "gt") }
+ 0b1110 => { write!(fmt, "al") }
+ 0b0001 => { write!(fmt, "ne") }
+ 0b0011 => { write!(fmt, "lo") }
+ 0b0101 => { write!(fmt, "pl") }
+ 0b0111 => { write!(fmt, "vc") }
+ 0b1001 => { write!(fmt, "ls") }
+ 0b1011 => { write!(fmt, "lt") }
+ 0b1101 => { write!(fmt, "le") }
+ 0b1111 => { write!(fmt, "al") }
+ _ => { unreachable!(); }
+ }
+ }
+ Operand::Offset(offs) => {
+ write!(fmt, "$+{:#x}", offs)
+ }
+ Operand::PCOffset(offs) => {
+ write!(fmt, "$+{:#x}", offs)
+ }
+ Operand::Immediate(i) => {
+ write!(fmt, "{:#x}", i)
+ },
+ Operand::Imm16(i) => {
+ write!(fmt, "{:#x}", *i)
+ },
+ Operand::Imm64(i) => {
+ write!(fmt, "{:#x}", *i)
+ },
+ Operand::ImmShift(i, shift) => {
+ match shift {
+ 0 => {
+ write!(fmt, "{:#x}", i)
+ },
+ _ => {
+ write!(fmt, "{:#x}, lsl {}", i, shift * 16)
+ }
+ }
+ },
+ Operand::RegShift(shift_type, amount, size, reg) => {
+ match size {
+ SizeCode::X => {
+ if *shift_type == ShiftStyle::LSL && *amount == 0 {
+ write!(fmt, "x{}", reg)
+ } else {
+ write!(fmt, "x{}, {} {}", reg, shift_type, amount)
+ }
+ },
+ SizeCode::W => {
+ if *shift_type == ShiftStyle::LSL && *amount == 0 {
+ write!(fmt, "w{}", reg)
+ } else {
+ write!(fmt, "w{}, {} {}", reg, shift_type, amount)
+ }
+ }
+ }
+ }
+ Operand::RegOffset(reg, offset) => {
+ if *offset != 0 {
+ if *offset < 0 {
+ write!(fmt, "[{}, -{:#x}]", Operand::RegisterOrSP(SizeCode::X, *reg), -*offset)
+ } else {
+ write!(fmt, "[{}, {:#x}]", Operand::RegisterOrSP(SizeCode::X, *reg), offset)
+ }
+ } else {
+ write!(fmt, "[{}]", Operand::RegisterOrSP(SizeCode::X, *reg))
+ }
+ }
+ Operand::RegRegOffset(reg, size_code, index_reg, extend, amount) => {
+ match size_code {
+ SizeCode::X => {
+ if *extend == ShiftStyle::LSL && *amount == 0 {
+ write!(fmt, "[x{}, x{}]", reg, index_reg)
+ } else {
+ write!(fmt, "[x{}, x{}, {} {}]", reg, index_reg, extend, amount)
+ }
+ },
+ SizeCode::W => {
+ if *extend == ShiftStyle::LSL && *amount == 0 {
+ write!(fmt, "[x{}, w{}]", reg, index_reg)
+ } else {
+ write!(fmt, "[x{}, w{}, {} {}]", reg, index_reg, extend, amount)
+ }
+ }
+ }
+ }
+ Operand::RegPreIndex(reg, offset) => {
+ if *offset != 0 {
+ if *offset < 0 {
+ write!(fmt, "[{}, -{:#x}]!", Operand::RegisterOrSP(SizeCode::X, *reg), -*offset)
+ } else {
+ write!(fmt, "[{}, {:#x}]!", Operand::RegisterOrSP(SizeCode::X, *reg), offset)
+ }
+ } else {
+ write!(fmt, "[{}]!", Operand::RegisterOrSP(SizeCode::X, *reg))
+ }
+ }
+ Operand::RegPostIndex(reg, offset) => {
+ if *offset != 0 {
+ if *offset < 0 {
+ write!(fmt, "[{}], -{:#x}", Operand::RegisterOrSP(SizeCode::X, *reg), -*offset)
+ } else {
+ write!(fmt, "[{}], {:#x}", Operand::RegisterOrSP(SizeCode::X, *reg), offset)
+ }
+ } else {
+ write!(fmt, "[{}]", Operand::RegisterOrSP(SizeCode::X, *reg))
+ }
+ }
+ }
+ }
+}
+
+#[allow(non_snake_case)]
+impl Decodable for Instruction {
+ fn decode<T: IntoIterator<Item=u8>>(bytes: T) -> Option<Self> {
+ let mut blank = Instruction::blank();
+ match blank.decode_into(bytes) {
+ Some(_) => Some(blank),
+ None => None
+ }
+ }
+ fn decode_into<T: IntoIterator<Item=u8>>(&mut self, bytes: T) -> Option<()> {
+ fn read_word<T: IntoIterator<Item=u8>>(bytes: T) -> Option<u32> {
+ 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);
+
+ Some(instr)
+ }
+
+ let word = match read_word(bytes) {
+ Some(word) => word,
+ None => { return None; }
+ };
+
+ #[derive(Copy, Clone, Debug)]
+ enum Section {
+ Unallocated,
+ LoadStore,
+ DataProcessingReg,
+ DataProcessingSimd,
+ DataProcessingSimd2,
+ DataProcessingImmediate,
+ BranchExceptionSystem,
+ }
+
+ // from ARM architecture refrence manual for ARMv8, C3.1
+
+ /*
+ * ---00--- UNALLOCATED
+ * ---100-- Data processing - immediate
+ * ---101-- Branch, exception, system instructions
+ * ----1-0- Loads and stores
+ * ----101- Data processing - register
+ * ---0111- Data processing - SIMD and floating point
+ * ---1111- Data processing - SIMD and floating point
+ */
+
+ let section_bits = word >> 25;
+ let section = [
+ Section::Unallocated, // 0000
+ Section::Unallocated, // 0001
+ Section::Unallocated, // 0010
+ Section::Unallocated, // 0011
+ Section::LoadStore, // 0100
+ Section::DataProcessingReg, // 0101
+ Section::LoadStore, // 0110
+ Section::DataProcessingSimd, // 0111
+ Section::DataProcessingImmediate, // 1000
+ Section::DataProcessingImmediate, // 1001
+ Section::BranchExceptionSystem, // 1010
+ Section::BranchExceptionSystem, // 1011
+ Section::LoadStore, // 1100
+ Section::DataProcessingReg, // 1101
+ Section::LoadStore, // 1110
+ Section::DataProcessingSimd2, // 1111
+ ][(section_bits & 0x0f) as usize];
+
+ println!("word: {:#x}, bits: {:#b}", word, section_bits & 0xf);
+
+ match section {
+ Section::DataProcessingSimd |
+ Section::DataProcessingSimd2 => {
+ unreachable!();
+ }
+ Section::Unallocated => {
+ self.opcode = Opcode::Invalid;
+ }
+ Section::DataProcessingReg => {
+ /*
+ * Section C3.5. Data Processing - Register
+ *
+ * instructions here have the form
+ * XXXX101X_XXXXXXXX_XXXXXXXX_XXXXXXXX
+ */
+ if (word & 0x10000000) != 0 {
+ // These are of the form
+ // XXX1101X_...
+ let group_bits = (word >> 22) & 0x7;
+ println!("Group bits: {:#b}", group_bits);
+ match group_bits {
+ 0b000 => {
+ // Add/subtract (with carry)
+ let Rd = (word & 0x1f) as u16;
+ let Rn = ((word >> 5) & 0x1f) as u16;
+ let opc2 = ((word >> 10) & 0x3f) as u16;
+ let Rm = ((word >> 16) & 0x1f) as u16;
+
+ if opc2 == 0b000000 {
+ self.opcode = Opcode::Invalid;
+ return Some(());
+ }
+
+ let size_code = match word >> 29 {
+ 0b000 => {
+ self.opcode = Opcode::ADC;
+ SizeCode::W
+ }
+ 0b001 => {
+ self.opcode = Opcode::ADCS;
+ SizeCode::W
+ }
+ 0b010 => {
+ self.opcode = Opcode::SBC;
+ SizeCode::W
+ }
+ 0b011 => {
+ self.opcode = Opcode::SBCS;
+ SizeCode::W
+ }
+ 0b100 => {
+ self.opcode = Opcode::ADC;
+ SizeCode::X
+ }
+ 0b101 => {
+ self.opcode = Opcode::ADCS;
+ SizeCode::X
+ }
+ 0b110 => {
+ self.opcode = Opcode::SBC;
+ SizeCode::X
+ }
+ 0b111 => {
+ self.opcode = Opcode::SBCS;
+ SizeCode::X
+ }
+ _ => {
+ unreachable!();
+ }
+ };
+
+ self.operands = [
+ Operand::Register(size_code, Rd),
+ Operand::Register(size_code, Rn),
+ Operand::Register(size_code, Rm),
+ Operand::Nothing
+ ];
+ },
+ 0b001 => {
+ // Conditional compare (register/immediate)
+ },
+ 0b010 => {
+ // Conditional select
+ let op2 = (word >> 10) & 0x03;
+ let sf_op = (word >> 28) & 0x0c;
+
+ if word & 0x20000000 != 0 {
+ self.opcode = Opcode::Invalid;
+ return Some(());
+ }
+
+ let size = match sf_op | op2 {
+ 0b0000 => {
+ self.opcode = Opcode::CSEL;
+ SizeCode::W
+ },
+ 0b0001 => {
+ self.opcode = Opcode::CSINC;
+ SizeCode::W
+ },
+ 0b0100 => {
+ self.opcode = Opcode::CSINV;
+ SizeCode::W
+ },
+ 0b0101 => {
+ self.opcode = Opcode::CSNEG;
+ SizeCode::W
+ },
+ 0b1000 => {
+ self.opcode = Opcode::CSEL;
+ SizeCode::X
+ },
+ 0b1001 => {
+ self.opcode = Opcode::CSINC;
+ SizeCode::X
+ },
+ 0b1100 => {
+ self.opcode = Opcode::CSINV;
+ SizeCode::X
+ },
+ 0b1101 => {
+ self.opcode = Opcode::CSNEG;
+ SizeCode::X
+ },
+ 0b0010 |
+ 0b0011 |
+ 0b0110 |
+ 0b0111 |
+ 0b1010 |
+ 0b1011 |
+ 0b1110 |
+ 0b1111 => {
+ self.opcode = Opcode::Invalid;
+ return Some(());
+ },
+ _ => {
+ unreachable!();
+ }
+ };
+
+ let Rd = (word & 0x1f) as u16;
+ let Rn = ((word >> 5) & 0x1f) as u16;
+ let Rm = ((word >> 16) & 0x1f) as u16;
+ let cond = ((word >> 12) & 0x0f) as u8;
+
+ self.operands = [
+ Operand::Register(size, Rd),
+ Operand::Register(size, Rn),
+ Operand::Register(size, Rm),
+ Operand::ConditionCode(cond)
+ ];
+ },
+ 0b011 => {
+ // Data processing (1 source, 2 source)
+ },
+ _ => {
+ // Data processing (3 source)
+ }
+ }
+ } else {
+ // These are of the form
+ // XXX0101X_...
+ // so bits 21 and 24 fully distinguish categories here...
+ // but bit 21 distinguishes between add/sub shifted/extended, which
+ // we can deal with later. so use bit 24 to figure out the instruction
+ // class, first.
+ if (word & 0x01000000) == 0 {
+ // Logical (shifted register)
+ // XXX01010X_...
+ unreachable!();
+ } else {
+ // Add/subtract ({shifted,extended} register)
+ // XXX11011X_...
+ // specific instruction is picked by the first two bits..
+ self.opcode = [
+ Opcode::ADD,
+ Opcode::ADDS,
+ Opcode::SUB,
+ Opcode::SUBS
+ ][((word >> 29) as usize) & 0x03];
+
+ let sf = (word >> 31) == 1;
+ let size = if sf { SizeCode::X } else { SizeCode::W };
+
+ // and operands are contingent on bit 21
+ if (word & 0x20000) != 0 {
+ // extended form
+ // opt (bits 22, 23) must be 0
+
+ if (word >> 22) & 0x03 != 0 {
+ self.opcode = Opcode::Invalid;
+ return None;
+ }
+
+ let Rd = (word & 0x1f) as u16;
+ let Rn = ((word >> 5) & 0x1f) as u16;
+ let imm3 = (word >> 10) & 0x07;
+ let option = (word >> 13) & 0x07;
+ let Rm = ((word >> 16) & 0x1f) as u16;
+
+ self.operands[0] = Operand::Register(size, Rd);
+ self.operands[1] = Operand::Register(size, Rn);
+
+ let shift = (imm3 * 16) as u8;
+ self.operands[2] = match option {
+ 0b000 => Operand::RegShift(ShiftStyle::UXTB, shift, SizeCode::W, Rm),
+ 0b001 => Operand::RegShift(ShiftStyle::UXTH, shift, SizeCode::W, Rm),
+ 0b010 => Operand::RegShift(ShiftStyle::UXTW, shift, SizeCode::W, Rm),
+ 0b011 => Operand::RegShift(ShiftStyle::UXTX, shift, SizeCode::X, Rm),
+ 0b100 => Operand::RegShift(ShiftStyle::SXTB, shift, SizeCode::W, Rm),
+ 0b101 => Operand::RegShift(ShiftStyle::SXTH, shift, SizeCode::W, Rm),
+ 0b110 => Operand::RegShift(ShiftStyle::SXTW, shift, SizeCode::W, Rm),
+ 0b111 => Operand::RegShift(ShiftStyle::SXTX, shift, SizeCode::X, Rm),
+ _ => { unreachable!(); },
+ };
+ } else {
+ // shifted form
+
+ let shift = (word >> 22) & 0x03;
+ if shift == 0b11 {
+ self.opcode = Opcode::Invalid;
+ return None;
+ }
+
+ let Rd = (word & 0x1f) as u16;
+ let Rn = ((word >> 5) & 0x1f) as u16;
+ let imm6 = ((word >> 10) & 0x3f) as u8;
+ let Rm = ((word >> 16) & 0x1f) as u16;
+
+ if size == SizeCode::W && imm6 >= 32 {
+ self.opcode = Opcode::Invalid;
+ return None;
+ }
+
+ self.operands[0] = Operand::Register(size, Rd);
+ self.operands[1] = Operand::Register(size, Rn);
+
+ self.operands[2] = match shift {
+ 0b00 => Operand::RegShift(ShiftStyle::LSL, imm6, size, Rm),
+ 0b01 => Operand::RegShift(ShiftStyle::LSR, imm6, size, Rm),
+ 0b10 => Operand::RegShift(ShiftStyle::ASR, imm6, size, Rm),
+ _ => { unreachable!(); },
+ };
+ }
+ }
+ }
+ },
+ Section::DataProcessingImmediate => {
+ /*
+ * Section C3.4, Data processing - immediate
+ * This collects bits 23:25, which are the only ones that vary in this category
+ */
+ let group_bits = (word >> 23) & 0x7;
+ match group_bits {
+ 0b000 |
+ 0b001 => {
+ // PC-rel addressing
+ if word >= 0x80000000 {
+ self.opcode = Opcode::ADRP;
+ let imm = ((word >> 3) & 0x1ffffc) | ((word >> 29) & 0x3);
+ self.operands = [
+ Operand::Register(SizeCode::X, (word & 0x1f) as u16),
+ Operand::Immediate(imm * 0x1000),
+ Operand::Nothing,
+ Operand::Nothing
+ ];
+ } else {
+ self.opcode = Opcode::ADR;
+ let imm = ((word >> 3) & 0x1ffffc) | ((word >> 29) & 0x3);
+ self.operands = [
+ Operand::Register(SizeCode::X, (word & 0x1f) as u16),
+ Operand::Immediate(imm),
+ Operand::Nothing,
+ Operand::Nothing
+ ];
+ };
+
+ }
+ 0b010 |
+ 0b011 => {
+ // add/sub imm
+ let Rd = word & 0x1f;
+ let Rn = (word >> 5) & 0x1f;
+ let imm12 = (word >> 10) & 0xfff;
+ let shift = (word >> 22) & 0x3;
+ let size = match word >> 29 {
+ 0b000 => {
+ self.opcode = Opcode::ADD;
+ SizeCode::W
+ },
+ 0b001 => {
+ self.opcode = Opcode::ADDS;
+ SizeCode::W
+ },
+ 0b010 => {
+ self.opcode = Opcode::SUB;
+ SizeCode::W
+ },
+ 0b011 => {
+ self.opcode = Opcode::SUBS;
+ SizeCode::W
+ },
+ 0b100 => {
+ self.opcode = Opcode::ADD;
+ SizeCode::X
+ },
+ 0b101 => {
+ self.opcode = Opcode::ADDS;
+ SizeCode::X
+ },
+ 0b110 => {
+ self.opcode = Opcode::SUB;
+ SizeCode::X
+ },
+ 0b111 => {
+ self.opcode = Opcode::SUBS;
+ SizeCode::X
+ },
+ _ => {
+ unreachable!();
+ }
+ };
+ self.operands[0] = Operand::Register(size, Rd as u16);
+ self.operands[1] = Operand::RegisterOrSP(size, Rn as u16);
+ self.operands[2] = match shift {
+ 0b00 => {
+ Operand::Immediate(imm12 as u32)
+ },
+ 0b01 => {
+ Operand::Immediate((imm12 << 12) as u32)
+ },
+ 0b10 |
+ 0b11 => {
+ self.opcode = Opcode::Invalid;
+ return None;
+ }
+ _ => { unreachable!(); }
+ };
+ self.operands[3] = Operand::Nothing;
+ }
+ 0b100 => {
+ // logical (imm)
+ let Rd = (word & 0x1f) as u16;
+ let Rn = ((word >> 5) & 0x1f) as u16;
+ let imms = (word >> 10) & 0x3f;
+ let immr = (word >> 16) & 0x3f;
+ let N = (word >> 22) & 1;
+ let size = match word >> 29 {
+ 0b000 => {
+ self.opcode = Opcode::AND;
+ SizeCode::W
+ }
+ 0b001 => {
+ self.opcode = Opcode::ORR;
+ SizeCode::W
+ }
+ 0b010 => {
+ self.opcode = Opcode::EOR;
+ SizeCode::W
+ }
+ 0b011 => {
+ self.opcode = Opcode::ANDS;
+ SizeCode::W
+ }
+ 0b100 => {
+ self.opcode = Opcode::AND;
+ SizeCode::X
+ }
+ 0b101 => {
+ self.opcode = Opcode::ORR;
+ SizeCode::X
+ }
+ 0b110 => {
+ self.opcode = Opcode::EOR;
+ SizeCode::X
+ }
+ 0b111 => {
+ self.opcode = Opcode::ANDS;
+ SizeCode::X
+ }
+ _ => {
+ unreachable!();
+ }
+ };
+
+ self.operands = [
+ Operand::Register(size, Rd),
+ Operand::Register(size, Rn),
+ match size {
+ SizeCode::W => Operand::Immediate(docs::DecodeBitMasks_32(N as u8, imms as u8, immr as u8).0),
+ SizeCode::X => Operand::Imm64(docs::DecodeBitMasks_64(N as u8, imms as u8, immr as u8).0)
+ },
+ Operand::Nothing
+ ];
+ },
+ 0b101 => {
+ // move wide (imm)
+ let Rd = word & 0x1f;
+ let imm16 = (word >> 5) & 0xffff;
+ let hw = (word >> 21) & 0x3;
+ let size = match word >> 29 {
+ 0b000 => {
+ if hw >= 0x10 {
+ self.opcode = Opcode::Invalid;
+ } else {
+ self.opcode = Opcode::MOVN;
+ }
+ SizeCode::W
+ },
+ 0b001 => {
+ self.opcode = Opcode::Invalid;
+ SizeCode::W
+ }
+ 0b010 => {
+ if hw >= 0x10 {
+ self.opcode = Opcode::Invalid;
+ } else {
+ self.opcode = Opcode::MOVZ;
+ }
+ SizeCode::W
+ },
+ 0b011 => {
+ if hw >= 0x10 {
+ self.opcode = Opcode::Invalid;
+ } else {
+ self.opcode = Opcode::MOVK;
+ }
+ SizeCode::W
+ },
+ 0b100 => {
+ self.opcode = Opcode::MOVN;
+ SizeCode::X
+ },
+ 0b101 => {
+ self.opcode = Opcode::Invalid;
+ SizeCode::X
+ }
+ 0b110 => {
+ self.opcode = Opcode::MOVZ;
+ SizeCode::X
+ },
+ 0b111 => {
+ self.opcode = Opcode::MOVK;
+ SizeCode::X
+ },
+ _ => {
+ unreachable!();
+ }
+ };
+
+ self.operands = [
+ Operand::Register(size, Rd as u16),
+ Operand::ImmShift(imm16 as u16, hw as u8),
+ Operand::Nothing,
+ Operand::Nothing
+ ];
+ },
+ 0b110 => {
+ // bitfield
+ let Rd = word & 0x1f;
+ let Rn = (word >> 5) & 0x1f;
+ let imms = (word >> 10) & 0x3f;
+ let immr = (word >> 16) & 0x3f;
+ let N = (word >> 22) & 0x1;
+
+ let sf_opc = word >> 29;
+
+ let size = match sf_opc {
+ 0b000 => {
+ if N == 0 {
+ self.opcode = Opcode::SBFM;
+ } else {
+ self.opcode = Opcode::Invalid;
+ }
+ SizeCode::W
+ }
+ 0b001 => {
+ if N == 0 {
+ self.opcode = Opcode::BFM;
+ } else {
+ self.opcode = Opcode::Invalid;
+ }
+ SizeCode::W
+ }
+ 0b010 => {
+ if N == 0 {
+ self.opcode = Opcode::UBFM;
+ } else {
+ self.opcode = Opcode::Invalid;
+ }
+ SizeCode::W
+ }
+ 0b011 => {
+ self.opcode = Opcode::Invalid;
+ SizeCode::W
+ }
+ 0b100 => {
+ if N == 1 {
+ self.opcode = Opcode::SBFM;
+ } else {
+ self.opcode = Opcode::Invalid;
+ }
+ SizeCode::X
+ }
+ 0b101 => {
+ if N == 1 {
+ self.opcode = Opcode::SBFM;
+ } else {
+ self.opcode = Opcode::Invalid;
+ }
+ SizeCode::X
+ }
+ 0b110 => {
+ if N == 1 {
+ self.opcode = Opcode::SBFM;
+ } else {
+ self.opcode = Opcode::Invalid;
+ }
+ SizeCode::X
+ }
+ 0b111 => {
+ self.opcode = Opcode::Invalid;
+ SizeCode::X
+ }
+ _ => {
+ unreachable!();
+ }
+ };
+
+ self.operands = [
+ Operand::Register(size, Rd as u16),
+ Operand::Register(size, Rn as u16),
+ Operand::Immediate(immr as u32),
+ Operand::Immediate(imms as u32)
+ ];
+ },
+ 0b111 => {
+ // extract
+ let Rd = word & 0x1f;
+ let Rn = (word >> 5) & 0x1f;
+ let imms = (word >> 10) & 0x3f;
+ let Rm = (word >> 16) & 0x1f;
+ let No0 = (word >> 21) & 0x3;
+
+ let sf_op21 = word >> 29;
+
+ if sf_op21 == 0b000 {
+ if No0 != 0b00 || imms >= 0x10 {
+ self.opcode = Opcode::Invalid;
+ } else {
+ self.opcode = Opcode::EXTR;
+ }
+ } else if sf_op21 == 0b100 {
+ if No0 != 0b10 {
+ self.opcode = Opcode::Invalid;
+ } else {
+ self.opcode = Opcode::EXTR;
+ }
+ } else {
+ self.opcode = Opcode::Invalid;
+ }
+ unreachable!();
+ }
+ _ => { unreachable!() }
+ }
+ },
+ Section::LoadStore => {
+ /*
+ * This corresponds to section C3.3, Loads and stores.
+ * Specifically, instructions in this category are all of the form
+ *
+ * v _ G G 1 G 0 G G _ v v v v v v _ _ _ _ v v __________
+ *
+ * where G+v variants indicate which instruction class the word is in.
+ *
+ * however! the G bits are sufficient to distinguish most class of instruction.
+ */
+
+ let group_byte = word >> 23;
+ let group_bits = (group_byte & 0x03) | ((group_byte >> 1) & 0x04) | ((group_byte >> 2) & 0x18);
+
+ println!("Group byte: {:#b}, bits: {:#b}", group_byte, group_bits);
+ match group_bits {
+ 0b00000 => {
+ let Rt = word & 0x1f;
+ let Rn = (word >> 5) & 0x1f;
+ let Rt2 = (word >> 10) & 0x1f;
+ let o0 = word & 0x0080;
+ let Rs = (word >> 16) & 0x1f;
+ let Lo1 = word & 0x600000;
+ let size = (word >> 29) & 0x3;
+ // load/store exclusive
+ // o2 == 0
+ self.opcode = match (size, Lo1, o0) {
+ (0b00, 0b00, 0b0) => Opcode::STXRB,
+ (0b00, 0b00, 0b1) => Opcode::STLXRB,
+ (0b00, 0b10, 0b0) => Opcode::LDXRB,
+ (0b00, 0b10, 0b1) => Opcode::LDAXRB,
+ (0b01, 0b00, 0b0) => Opcode::STXRH,
+ (0b01, 0b00, 0b1) => Opcode::STLXRH,
+ (0b01, 0b10, 0b0) => Opcode::LDXRH,
+ (0b01, 0b10, 0b1) => Opcode::LDAXRH,
+ (0b10, 0b00, 0b0) => Opcode::STXR, // 32-bit
+ (0b10, 0b00, 0b1) => Opcode::STLXR, // 32-bit
+ (0b10, 0b01, 0b0) => Opcode::STXP, // 32-bit
+ (0b10, 0b01, 0b1) => Opcode::STLXP, // 32-bit
+ (0b10, 0b10, 0b0) => Opcode::LDXR, // 32-bit
+ (0b10, 0b10, 0b1) => Opcode::LDAXR, // 32-bit
+ (0b10, 0b11, 0b0) => Opcode::LDXP, // 32-bit
+ (0b10, 0b11, 0b1) => Opcode::LDAXP, // 32-bit
+ (0b11, 0b00, 0b0) => Opcode::STXR, // 64-bit
+ (0b11, 0b00, 0b1) => Opcode::STLXR, // 64-bit
+ (0b11, 0b01, 0b0) => Opcode::STXP, // 64-bit
+ (0b11, 0b01, 0b1) => Opcode::STLXP, // 64-bit
+ (0b11, 0b10, 0b0) => Opcode::LDXR, // 64-bit
+ (0b11, 0b10, 0b1) => Opcode::LDAXR, // 64-bit
+ (0b11, 0b11, 0b0) => Opcode::LDXP, // 64-bit
+ (0b11, 0b11, 0b1) => Opcode::LDAXP, // 64-bit
+ _ => {
+ Opcode::Invalid
+ }
+ }
+ },
+ 0b00001 => {
+ let Rt = (word & 0x1f) as u16;
+ let Rn = ((word >> 5) & 0x1f) as u16;
+ let Rt2 = ((word >> 10) & 0x1f) as u16;
+ let o0 = (word >> 15) & 1;
+ let Rs = (word >> 16) & 0x1f;
+ let Lo1 = (word >> 21) & 0x3;
+ let size = (word >> 30) & 0x3;
+ // load/store exclusive
+ // o2 == 1
+ println!("Word: {:#b}", word);
+ self.opcode = match (size, Lo1, o0) {
+ (0b00, 0b00, 0b1) => Opcode::STLRB,
+ (0b00, 0b10, 0b1) => Opcode::LDARB,
+ (0b01, 0b00, 0b1) => Opcode::STLRH,
+ (0b01, 0b10, 0b1) => Opcode::LDARH,
+ (0b10, 0b00, 0b1) => Opcode::STLR, // 32-bit
+ (0b10, 0b10, 0b1) => Opcode::LDAR, // 32-bit
+ (0b11, 0b00, 0b1) => Opcode::STLR, // 64-bit
+ (0b11, 0b10, 0b1) => Opcode::LDAR, // 64-bit
+ _ => {
+ Opcode::Invalid
+ }
+ };
+ let size_code = if size == 0b11 {
+ SizeCode::X
+ } else {
+ SizeCode::W
+ };
+
+ self.operands = [
+ Operand::Register(size_code, Rt),
+ Operand::RegOffset(Rn, 0),
+ Operand::Nothing,
+ Operand::Nothing,
+ ];
+ },
+ 0b01000 |
+ 0b01001 => {
+ // load register (literal)
+ // V == 0
+ let opc = (word >> 29) & 0x3;
+ let Rt = (word & 0x1f) as u16;
+ let imm19 = (word >> 5) & 0x7fff;
+
+ let size = match opc {
+ 0b00 => {
+ self.opcode = Opcode::LDR;
+ SizeCode::W
+ },
+ 0b01 => {
+ self.opcode = Opcode::LDR;
+ SizeCode::X
+ }
+ 0b10 => {
+ self.opcode = Opcode::LDRSW;
+ SizeCode::X
+ }
+ 0b11 => {
+ unreachable!("PRFM is not supported");
+ }
+ _ => {
+ unreachable!();
+ }
+ };
+
+ self.operands = [
+ Operand::Register(size, Rt),
+ Operand::PCOffset(imm19),
+ Operand::Nothing,
+ Operand::Nothing,
+ ];
+ },
+ 0b01100 |
+ 0b01101 => {
+ // load register (literal)
+ // V == 1
+ let opc = (word >> 29) & 0x3;
+ let Rt = word & 0x1f;
+ let imm19 = (word >> 5) & 0x7fff;
+ panic!("C3.3.5 V==1");
+ },
+ 0b10000 => {
+ // load/store no-allocate pair (offset)
+ // V == 0
+ let opc_L = ((word >> 22) & 1) | ((word >> 29) & 0x6);
+ panic!("C3.3.7 V==0");
+ },
+ 0b10100 => {
+ // load/store no-allocate pair (offset)
+ // V == 1
+ let opc_L = ((word >> 22) & 1) | ((word >> 29) & 0x6);
+ panic!("C3.3.7 V==1");
+ },
+ 0b10001 => {
+ // load/store register pair (post-indexed)
+ // V == 0
+ let Rt = (word & 0x1f) as u16;
+ let Rn = ((word >> 5) & 0x1f) as u16;
+ let Rt2 = ((word >> 10) & 0x1f) as u16;
+ let mut imm7 = (((((word >> 15) & 0x7f) as i16) << 9) >> 9);
+ let opc_L = ((word >> 22) & 1) | ((word >> 29) & 0x6);
+ let size = match opc_L {
+ 0b000 => {
+ self.opcode = Opcode::STP;
+ imm7 <<= 2;
+ SizeCode::W
+ },
+ 0b001 => {
+ self.opcode = Opcode::LDP;
+ imm7 <<= 2;
+ SizeCode::W
+ },
+ 0b010 => {
+ self.opcode = Opcode::Invalid;
+ SizeCode::W
+ },
+ 0b011 => {
+ self.opcode = Opcode::LDPSW;
+ imm7 <<= 2;
+ SizeCode::W
+ },
+ 0b100 => {
+ self.opcode = Opcode::STP;
+ imm7 <<= 3;
+ SizeCode::X
+ },
+ 0b101 => {
+ self.opcode = Opcode::LDP;
+ imm7 <<= 3;
+ SizeCode::X
+ },
+ 0b110 |
+ 0b111 => {
+ self.opcode = Opcode::Invalid;
+ SizeCode::X
+ }
+ _ => { unreachable!(); }
+ };
+ self.operands = [
+ Operand::Register(size, Rt),
+ Operand::Register(size, Rt2),
+ Operand::RegPostIndex(Rn, imm7),
+ Operand::Nothing
+ ];
+ },
+ 0b10101 => {
+ // load/store register pair (post-indexed)
+ // V == 1
+ let opc_L = ((word >> 22) & 1) | ((word >> 29) & 0x6);
+ panic!("C3.3.15 V==1");
+ },
+ 0b10010 => {
+ // load/store register pair (offset)
+ // V == 0
+ let Rt = (word & 0x1f) as u16;
+ let Rn = ((word >> 5) & 0x1f) as u16;
+ let Rt2 = ((word >> 10) & 0x1f) as u16;
+ let mut imm7 = (((((word >> 15) & 0x7f) as i16) << 9) >> 9);
+ let opc_L = ((word >> 22) & 1) | ((word >> 29) & 0x6);
+ let size = match opc_L {
+ 0b000 => {
+ self.opcode = Opcode::STP;
+ imm7 <<= 2;
+ SizeCode::W
+ },
+ 0b001 => {
+ self.opcode = Opcode::LDP;
+ imm7 <<= 2;
+ SizeCode::W
+ },
+ 0b010 => {
+ self.opcode = Opcode::Invalid;
+ SizeCode::W
+ },
+ 0b011 => {
+ self.opcode = Opcode::LDPSW;
+ imm7 <<= 2;
+ SizeCode::W
+ },
+ 0b100 => {
+ self.opcode = Opcode::STP;
+ imm7 <<= 3;
+ SizeCode::X
+ },
+ 0b101 => {
+ self.opcode = Opcode::LDP;
+ imm7 <<= 3;
+ SizeCode::X
+ },
+ 0b110 |
+ 0b111 => {
+ self.opcode = Opcode::Invalid;
+ SizeCode::X
+ }
+ _ => { unreachable!(); }
+ };
+ self.operands = [
+ Operand::Register(size, Rt),
+ Operand::Register(size, Rt2),
+ Operand::RegOffset(Rn, imm7),
+ Operand::Nothing
+ ];
+ },
+ 0b10110 => {
+ // load/store register pair (offset)
+ // V == 1
+ let opc_L = ((word >> 22) & 1) | ((word >> 29) & 0x6);
+ panic!("C3.3.14 V==1");
+ },
+ 0b10011 => {
+ // load/store register pair (pre-indexed)
+ // V == 0
+ let Rt = (word & 0x1f) as u16;
+ let Rn = ((word >> 5) & 0x1f) as u16;
+ let Rt2 = ((word >> 10) & 0x1f) as u16;
+ let mut imm7 = (((((word >> 15) & 0x7f) as i16) << 9) >> 9);
+ let opc_L = ((word >> 22) & 1) | ((word >> 29) & 0x6);
+ let size = match opc_L {
+ 0b000 => {
+ self.opcode = Opcode::STP;
+ imm7 <<= 2;
+ SizeCode::W
+ },
+ 0b001 => {
+ self.opcode = Opcode::LDP;
+ imm7 <<= 2;
+ SizeCode::W
+ },
+ 0b010 => {
+ self.opcode = Opcode::Invalid;
+ SizeCode::W
+ },
+ 0b011 => {
+ self.opcode = Opcode::LDPSW;
+ imm7 <<= 2;
+ SizeCode::W
+ },
+ 0b100 => {
+ self.opcode = Opcode::STP;
+ imm7 <<= 3;
+ SizeCode::X
+ },
+ 0b101 => {
+ self.opcode = Opcode::LDP;
+ imm7 <<= 3;
+ SizeCode::X
+ },
+ 0b110 |
+ 0b111 => {
+ self.opcode = Opcode::Invalid;
+ SizeCode::X
+ }
+ _ => { unreachable!(); }
+ };
+ self.operands = [
+ Operand::Register(size, Rt),
+ Operand::Register(size, Rt2),
+ Operand::RegPreIndex(Rn, imm7),
+ Operand::Nothing
+ ];
+ },
+ 0b10111 => {
+ // load/store register pair (pre-indexed)
+ // V == 1
+ let opc_L = ((word >> 22) & 1) | ((word >> 29) & 0x6);
+ panic!("C3.3.16 V==1");
+ },
+ 0b11000 |
+ 0b11001 => {
+ /*
+ * load/store register {unscaled immediate, immediate post-indexed,
+ * unprivileged, immediate pre-indexd, register offset}
+ * V == 0
+ */
+ let Rt = (word & 0x1f) as u16;
+ let Rn = ((word >> 5) & 0x1f) as u16;
+ let size_opc = ((word >> 22) & 0x03) | ((word >> 28) & 0x0c);
+ let category = (word >> 10) & 0x03;
+ println!("load/store: size_opc: {:#b}, category: {:#b}", size_opc, category);
+ if word & 0x200000 != 0 {
+ if category != 0b10 {
+ self.opcode = Opcode::Invalid;
+ return Some(());
+ } else {
+ // Load/store register (register offset)
+ // C3.3.10
+ let size = match size_opc {
+ 0b0000 => {
+ self.opcode = Opcode::STRB;
+ SizeCode::W
+ },
+ 0b0001 => {
+ self.opcode = Opcode::LDRB;
+ SizeCode::W
+ },
+ 0b0010 => {
+ self.opcode = Opcode::LDRSB;
+ SizeCode::X
+ },
+ 0b0011 => {
+ self.opcode = Opcode::LDRSB;
+ SizeCode::W
+ },
+ 0b0100 => {
+ self.opcode = Opcode::STRH;
+ SizeCode::W
+ },
+ 0b0101 => {
+ self.opcode = Opcode::LDRH;
+ SizeCode::W
+ },
+ 0b0110 => {
+ self.opcode = Opcode::LDRSH;
+ SizeCode::X
+ },
+ 0b0111 => {
+ self.opcode = Opcode::LDRSH;
+ SizeCode::W
+ },
+ 0b1000 => {
+ self.opcode = Opcode::STR;
+ SizeCode::W
+ },
+ 0b1001 => {
+ self.opcode = Opcode::LDR;
+ SizeCode::W
+ },
+ 0b1010 => {
+ self.opcode = Opcode::LDRSW;
+ SizeCode::X
+ },
+ 0b1011 => {
+ self.opcode = Opcode::Invalid;
+ SizeCode::X
+ },
+ 0b1100 => {
+ self.opcode = Opcode::STR;
+ SizeCode::X
+ },
+ 0b1101 => {
+ self.opcode = Opcode::LDR;
+ SizeCode::X
+ },
+ 0b1110 => {
+ panic!("PRFM is not supported yet");
+// self.opcode = Opcode::PRFM;
+// SizeCode::X
+ },
+ 0b1111 => {
+ self.opcode = Opcode::Invalid;
+ SizeCode::X
+ },
+ _ => { unreachable!(); }
+ };
+
+ let S = ((word >> 12) & 0x1) as u8;
+ let option = ((word >> 13) & 0x07) as u8;
+ let Rm = ((word >> 16) & 0x1f) as u16;
+
+ let index_size = match option & 0x3 {
+ 0b00 |
+ 0b01 => {
+ self.opcode = Opcode::Invalid;
+ return Some(());
+ },
+ 0b10 => { SizeCode::W }
+ 0b11 => { SizeCode::X }
+ _ => { unreachable!(); }
+ };
+
+ let shift_style = match option {
+ 0b000 |
+ 0b001 => {
+ self.opcode = Opcode::Invalid;
+ return Some(());
+ },
+ 0b010 => { ShiftStyle::UXTW },
+ 0b011 => { ShiftStyle::LSL },
+ 0b100 |
+ 0b101 => {
+ self.opcode = Opcode::Invalid;
+ return Some(());
+ },
+ 0b110 => { ShiftStyle::SXTW },
+ 0b111 => { ShiftStyle::SXTX },
+ _ => { unreachable!(); }
+ };
+
+ self.operands = [
+ Operand::Register(size, Rt),
+ Operand::RegRegOffset(Rn, index_size, Rm, shift_style, S),
+ Operand::Nothing,
+ Operand::Nothing,
+ ];
+ }
+ } else {
+ let imm9 = ((((word >> 12) & 0x1ff) as i16) << 7) >> 7;
+ match category {
+ 0b00 => {
+ // Load/store register (unscaled immediate)
+ let size = match size_opc {
+ 0b0000 => {
+ self.opcode = Opcode::STURB;
+ SizeCode::W
+ }
+ 0b0001 => {
+ self.opcode = Opcode::LDURB;
+ SizeCode::W
+ }
+ 0b0010 => {
+ self.opcode = Opcode::LDURSB;
+ SizeCode::X
+ }
+ 0b0011 => {
+ self.opcode = Opcode::LDURSB;
+ SizeCode::W
+ }
+ 0b0100 => {
+ self.opcode = Opcode::STURH;
+ SizeCode::W
+ }
+ 0b0101 => {
+ self.opcode = Opcode::LDURH;
+ SizeCode::W
+ }
+ 0b0110 => {
+ self.opcode = Opcode::LDURSH;
+ SizeCode::X
+ }
+ 0b0111 => {
+ self.opcode = Opcode::LDURSH;
+ SizeCode::W
+ }
+ 0b1000 => {
+ self.opcode = Opcode::STUR;
+ SizeCode::W
+ }
+ 0b1001 => {
+ self.opcode = Opcode::LDUR;
+ SizeCode::W
+ }
+ 0b1010 => {
+ self.opcode = Opcode::LDURSW;
+ SizeCode::X
+ }
+ 0b1011 => {
+ self.opcode = Opcode::Invalid;
+ SizeCode::W
+ }
+ 0b1100 => {
+ self.opcode = Opcode::STUR;
+ SizeCode::X
+ }
+ 0b1101 => {
+ self.opcode = Opcode::LDUR;
+ SizeCode::X
+ }
+ 0b1110 => {
+ panic!("PRFUM not handled yet");
+ },
+ 0b1111 => {
+ self.opcode = Opcode::Invalid;
+ SizeCode::W
+ }
+ _ => {
+ unreachable!();
+ }
+ };
+
+ self.operands = [
+ Operand::Register(size, Rt),
+ Operand::RegOffset(Rn, imm9),
+ Operand::Nothing,
+ Operand::Nothing,
+ ];
+ }
+ 0b10 => {
+ // Load/store register (unprivileged)
+
+ let size = match size_opc {
+ 0b0000 => {
+ self.opcode = Opcode::STTRB;
+ SizeCode::W
+ }
+ 0b0001 => {
+ self.opcode = Opcode::LDTRB;
+ SizeCode::W
+ }
+ 0b0010 => {
+ self.opcode = Opcode::LDTRSB;
+ SizeCode::X
+ }
+ 0b0011 => {
+ self.opcode = Opcode::LDTRSB;
+ SizeCode::W
+ }
+ 0b0100 => {
+ self.opcode = Opcode::STTRH;
+ SizeCode::W
+ }
+ 0b0101 => {
+ self.opcode = Opcode::LDTRH;
+ SizeCode::W
+ }
+ 0b0110 => {
+ self.opcode = Opcode::LDTRSH;
+ SizeCode::X
+ }
+ 0b0111 => {
+ self.opcode = Opcode::LDTRSH;
+ SizeCode::W
+ }
+ 0b1000 => {
+ self.opcode = Opcode::STTR;
+ SizeCode::W
+ }
+ 0b1001 => {
+ self.opcode = Opcode::LDTR;
+ SizeCode::W
+ }
+ 0b1010 => {
+ self.opcode = Opcode::LDTRSW;
+ SizeCode::X
+ }
+ 0b1011 => {
+ self.opcode = Opcode::Invalid;
+ SizeCode::W
+ }
+ 0b1100 => {
+ self.opcode = Opcode::STTR;
+ SizeCode::X
+ }
+ 0b1101 => {
+ self.opcode = Opcode::LDTR;
+ SizeCode::X
+ }
+ 0b1110 |
+ 0b1111 => {
+ self.opcode = Opcode::Invalid;
+ SizeCode::W
+ }
+ _ => {
+ unreachable!();
+ }
+ };
+
+ self.operands = [
+ Operand::Register(size, Rt),
+ Operand::RegPreIndex(Rn, imm9),
+ Operand::Nothing,
+ Operand::Nothing,
+ ];
+ }
+ 0b01 |
+ 0b11 => {
+ let size = match size_opc {
+ 0b0000 => {
+ self.opcode = Opcode::STRB;
+ SizeCode::W
+ },
+ 0b0001 => {
+ self.opcode = Opcode::LDRB;
+ SizeCode::W
+ }
+ 0b0010 => {
+ self.opcode = Opcode::LDRSB;
+ SizeCode::X
+ }
+ 0b0011 => {
+ self.opcode = Opcode::LDRSB;
+ SizeCode::W
+ }
+ 0b0100 => {
+ self.opcode = Opcode::STRH;
+ SizeCode::W
+ }
+ 0b0101 => {
+ self.opcode = Opcode::LDRH;
+ SizeCode::W
+ }
+ 0b0110 => {
+ self.opcode = Opcode::LDRSH;
+ SizeCode::X
+ }
+ 0b0111 => {
+ self.opcode = Opcode::LDRSH;
+ SizeCode::W
+ }
+ 0b1000 => {
+ self.opcode = Opcode::STR;
+ SizeCode::W
+ }
+ 0b1001 => {
+ self.opcode = Opcode::LDR;
+ SizeCode::W
+ }
+ 0b1010 |
+ 0b1011 => {
+ self.opcode = Opcode::Invalid;
+ SizeCode::W
+ }
+ 0b1100 => {
+ self.opcode = Opcode::STR;
+ SizeCode::X
+ }
+ 0b1101 => {
+ self.opcode = Opcode::LDR;
+ SizeCode::X
+ }
+ 0b1110 |
+ 0b1111 => {
+ self.opcode = Opcode::Invalid;
+ SizeCode::X
+ }
+ _ => {
+ unreachable!();
+ }
+ };
+
+ self.operands = [
+ Operand::Register(size, Rt),
+ if category == 0b01 {
+ Operand::RegPostIndex(Rn, imm9)
+ } else {
+ Operand::RegPreIndex(Rn, imm9)
+ },
+ Operand::Nothing,
+ Operand::Nothing,
+ ];
+ },
+ _ => {
+ unreachable!();
+ }
+ }
+ }
+ }
+ 0b11100 |
+ 0b11101 => {
+ /*
+ * load/store register {unscaled immediate, immediate post-indexed,
+ * unprivileged, immediate pre-indexd, register offset}
+ * V == 1
+ */
+ }
+ 0b11010 |
+ 0b11011 => {
+ // load/store register (unsigned immediate)
+ // V == 0
+ let Rt = (word & 0x1f) as u16;
+ let Rn = ((word >> 5) & 0x1f) as u16;
+ let imm12 = ((((word >> 10) as i16) & 0x0fff) << 4) >> 4;
+ let size_opc = ((word >> 22) & 0x3) | ((word >> 28) & 0xc);
+ match size_opc {
+ 0b0000 => {
+ self.opcode = Opcode::STRB;
+ self.operands = [
+ Operand::Register(SizeCode::W, Rt),
+ Operand::RegOffset(Rn, imm12),
+ Operand::Nothing,
+ Operand::Nothing,
+ ];
+ }
+ 0b0001 => {
+ self.opcode = Opcode::LDRB;
+ self.operands = [
+ Operand::Register(SizeCode::W, Rt),
+ Operand::RegOffset(Rn, imm12),
+ Operand::Nothing,
+ Operand::Nothing,
+ ];
+ }
+ 0b0010 => {
+ self.opcode = Opcode::LDRSB;
+ self.operands = [
+ Operand::Register(SizeCode::X, Rt),
+ Operand::RegOffset(Rn, imm12),
+ Operand::Nothing,
+ Operand::Nothing,
+ ];
+ }
+ 0b0011 => {
+ self.opcode = Opcode::LDRSB;
+ self.operands = [
+ Operand::Register(SizeCode::W, Rt),
+ Operand::RegOffset(Rn, imm12),
+ Operand::Nothing,
+ Operand::Nothing,
+ ];
+ }
+ 0b0100 => {
+ self.opcode = Opcode::STRH;
+ self.operands = [
+ Operand::Register(SizeCode::W, Rt),
+ Operand::RegOffset(Rn, imm12 << 1),
+ Operand::Nothing,
+ Operand::Nothing,
+ ];
+ }
+ 0b0101 => {
+ self.opcode = Opcode::LDRH;
+ self.operands = [
+ Operand::Register(SizeCode::W, Rt),
+ Operand::RegOffset(Rn, imm12 << 1),
+ Operand::Nothing,
+ Operand::Nothing,
+ ];
+ }
+ 0b0110 => {
+ self.opcode = Opcode::LDRSH;
+ self.operands = [
+ Operand::Register(SizeCode::X, Rt),
+ Operand::RegOffset(Rn, imm12 << 1),
+ Operand::Nothing,
+ Operand::Nothing,
+ ];
+ }
+ 0b0111 => {
+ self.opcode = Opcode::LDRSH;
+ self.operands = [
+ Operand::Register(SizeCode::W, Rt),
+ Operand::RegOffset(Rn, imm12 << 1),
+ Operand::Nothing,
+ Operand::Nothing,
+ ];
+ }
+ 0b1000 => {
+ self.opcode = Opcode::STR;
+ self.operands = [
+ Operand::Register(SizeCode::W, Rt),
+ Operand::RegOffset(Rn, imm12 << 2),
+ Operand::Nothing,
+ Operand::Nothing,
+ ];
+ }
+ 0b1001 => {
+ self.opcode = Opcode::LDR;
+ self.operands = [
+ Operand::Register(SizeCode::W, Rt),
+ Operand::RegOffset(Rn, imm12 << 2),
+ Operand::Nothing,
+ Operand::Nothing,
+ ];
+ }
+ 0b1010 => {
+ self.opcode = Opcode::LDRSW;
+ self.operands = [
+ Operand::Register(SizeCode::X, Rt),
+ Operand::RegOffset(Rn, imm12 << 2),
+ Operand::Nothing,
+ Operand::Nothing,
+ ];
+ }
+ 0b1011 => { self.opcode = Opcode::Invalid; }
+ 0b1100 => {
+ self.opcode = Opcode::STR;
+ self.operands = [
+ Operand::Register(SizeCode::X, Rt),
+ Operand::RegOffset(Rn, imm12 << 3),
+ Operand::Nothing,
+ Operand::Nothing,
+ ];
+ }
+ 0b1101 => {
+ self.opcode = Opcode::LDR;
+ self.operands = [
+ Operand::Register(SizeCode::X, Rt),
+ Operand::RegOffset(Rn, imm12 << 3),
+ Operand::Nothing,
+ Operand::Nothing,
+ ];
+ }
+ 0b1110 => {
+ unreachable!("PRFM not yet supported");
+ }
+ 0b1111 => { self.opcode = Opcode::Invalid; }
+ _ => { unreachable!(); }
+ }
+ },
+ 0b11110 |
+ 0b11111 => {
+ // load/store register (unsigned immediate)
+ // V == 1
+ },
+ 0b00100 => {
+ // AdvSIMD load/store multiple structures
+ },
+ 0b00101 => {
+ // AdvSIMD load/store multiple structures (post-indexed)
+ },
+ 0b00110 => {
+ // AdvSIMD load/store single structure
+ },
+ 0b00111 => {
+ // AdvSIMD load/store single structure (post-indexed)
+ }
+ _ => {
+ self.opcode = Opcode::Invalid;
+ }
+ }
+ },
+ Section::BranchExceptionSystem => {
+ let group_bits = ((word >> 29) << 2) | ((word >> 24) & 0x03);
+ match group_bits {
+ 0b00000 |
+ 0b00001 |
+ 0b00010 |
+ 0b00011 => { // unconditional branch (imm)
+ self.opcode = Opcode::B;
+ self.operands = [
+ Operand::Offset((word & 0x01ffffff) << 2),
+ Operand::Nothing,
+ Operand::Nothing,
+ Operand::Nothing
+ ];
+ },
+ 0b00100 => { // compare branch (imm)
+ self.opcode = Opcode::CBZ;
+ let imm = (word >> 3) & 0x001ffffc;
+ let Rt = word & 0x1f;
+ self.operands = [
+ Operand::Register(SizeCode::W, Rt as u16),
+ Operand::Offset(imm),
+ Operand::Nothing,
+ Operand::Nothing
+ ];
+ },
+ 0b00101 => { // compare branch (imm)
+ self.opcode = Opcode::CBNZ;
+ let imm = (word >> 3) & 0x001ffffc;
+ let Rt = word & 0x1f;
+ self.operands = [
+ Operand::Register(SizeCode::W, Rt as u16),
+ Operand::Offset(imm),
+ Operand::Nothing,
+ Operand::Nothing
+ ];
+ },
+ 0b00110 => { // test branch (imm)
+ let imm = (word >> 3) & 0x0003fffc;
+ let b = (word >> 19) & 0x1f;
+ let Rt = word & 0x1f;
+ self.opcode = Opcode::TBZ;
+ self.operands = [
+ Operand::Register(SizeCode::W, Rt as u16),
+ Operand::Imm16(b as u16),
+ Operand::Offset(imm),
+ Operand::Nothing
+ ];
+ },
+ 0b00111 => { // test branch (imm)
+ let imm = (word >> 3) & 0x0003fffc;
+ let b = (word >> 19) & 0x1f;
+ let Rt = word & 0x1f;
+ self.opcode = Opcode::TBNZ;
+ self.operands = [
+ Operand::Register(SizeCode::W, Rt as u16),
+ Operand::Imm16(b as u16),
+ Operand::Offset(imm),
+ Operand::Nothing
+ ];
+ },
+ 0b01000 => { // conditional branch (imm)
+ let imm = (word >> 3) & 0x001ffffc;
+ let cond = word & 0x0f;
+ self.opcode = Opcode::Bcc(cond as u8);
+ self.operands = [
+ Operand::Offset(imm),
+ Operand::Nothing,
+ Operand::Nothing,
+ Operand::Nothing
+ ];
+ }
+ 0b01001 => { // conditional branch (imm)
+ self.opcode = Opcode::Invalid;
+ }
+ /* 0b01010 to 0b01111 seem all invalid? */
+ 0b10000 |
+ 0b10001 |
+ 0b10010 |
+ 0b10011 => { // unconditional branch (imm)
+ self.opcode = Opcode::BL;
+ self.operands = [
+ Operand::Offset((word & 0x01ffffff) << 2),
+ Operand::Nothing,
+ Operand::Nothing,
+ Operand::Nothing
+ ];
+ },
+ 0b10100 => { // compare branch (imm)
+ self.opcode = Opcode::CBZ;
+ let imm = (word >> 3) & 0x001ffffc;
+ let Rt = word & 0x1f;
+ self.operands = [
+ Operand::Register(SizeCode::X, Rt as u16),
+ Operand::Offset(imm),
+ Operand::Nothing,
+ Operand::Nothing
+ ];
+ },
+ 0b10101 => { // compare branch (imm)
+ self.opcode = Opcode::CBNZ;
+ let imm = (word >> 3) & 0x001ffffc;
+ let Rt = word & 0x1f;
+ self.operands = [
+ Operand::Register(SizeCode::X, Rt as u16),
+ Operand::Offset(imm),
+ Operand::Nothing,
+ Operand::Nothing
+ ];
+ },
+ 0b10110 => { // test branch (imm)
+ let imm = (word >> 3) & 0x0003fffc;
+ let b = (word >> 19) & 0x1f;
+ let Rt = word & 0x1f;
+ self.opcode = Opcode::TBZ;
+ self.operands = [
+ Operand::Register(SizeCode::X, Rt as u16),
+ Operand::Imm16((b as u16) | 0x20),
+ Operand::Offset(imm),
+ Operand::Nothing
+ ];
+ },
+ 0b10111 => { // test branch (imm)
+ let imm = (word >> 3) & 0x0003fffc;
+ let b = (word >> 19) & 0x1f;
+ let Rt = word & 0x1f;
+ self.opcode = Opcode::TBNZ;
+ self.operands = [
+ Operand::Register(SizeCode::X, Rt as u16),
+ Operand::Imm16((b as u16) | 0x20),
+ Operand::Offset(imm),
+ Operand::Nothing
+ ];
+ },
+ 0b11000 => { // exception generation
+ let ll = word & 0x3;
+ let op2 = (word >> 2) & 0x7;
+ let opc = (word >> 21) & 0x7;
+ match (opc, op2, ll) {
+ (0b000, 0b000, 0b01) => {
+ self.opcode = Opcode::SVC;
+ }
+ (0b000, 0b000, 0b10) => {
+ self.opcode = Opcode::HVC;
+ }
+ (0b000, 0b000, 0b11) => {
+ self.opcode = Opcode::SMC;
+ }
+ (0b001, 0b000, 0b00) => {
+ self.opcode = Opcode::BRK;
+ }
+ (0b010, 0b000, 0b00) => {
+ self.opcode = Opcode::HLT;
+ }
+ (0b101, 0b000, 0b01) => {
+ self.opcode = Opcode::DCPS1;
+ }
+ (0b101, 0b000, 0b10) => {
+ self.opcode = Opcode::DCPS2;
+ }
+ (0b101, 0b000, 0b11) => {
+ self.opcode = Opcode::DCPS3;
+ }
+ _ => {
+ self.opcode = Opcode::Invalid;
+ }
+ }
+ let imm = (word >> 5) & 0xffff;
+ self.operands = [
+ Operand::Imm16(imm as u16),
+ Operand::Nothing,
+ Operand::Nothing,
+ Operand::Nothing
+ ];
+ },
+ 0b11001 => { // system
+ let remainder = word & 0xffffff;
+ if remainder >= 0x400000 {
+ self.opcode = Opcode::Invalid;
+ } else {
+ let Rt = word & 0x1f;
+ let Lop0 = ((word >> 19) & 0x7) as u8;
+ match Lop0 {
+ 0b000 => {
+ // MSR, HINT, CLREX, DSB, DMB, ISB
+ if Rt == 0b11111 {
+ let CRn = (word >> 12) & 0xf;
+ let op1 = (word >> 16) & 0x7;
+ let op2 = (word >> 5) & 0x1f;
+
+ match CRn {
+ 0b0010 => {
+ if op1 == 0b011 {
+ self.opcode = Opcode::HINT(op2 as u8);
+ } else {
+ self.opcode = Opcode::Invalid;
+ }
+ },
+ 0b0011 => {
+ match op2 {
+ 0b010 => {
+ self.opcode = Opcode::CLREX;
+ },
+ 0b100 => {
+ self.opcode = Opcode::DSB;
+ },
+ 0b101 => {
+ self.opcode = Opcode::DMB;
+ },
+ 0b110 => {
+ self.opcode = Opcode::ISB;
+ }
+ _ => {
+ self.opcode = Opcode::Invalid;
+ }
+ };
+ },
+ 0b0100 => {
+ self.opcode = Opcode::MSRa(op1 as u8, op2 as u8);
+ self.operands[0] = Operand::Imm16(
+ ((word >> 8) & 0xf) as u16
+ );
+ }
+ _ => {
+ self.opcode = Opcode::Invalid;
+ }
+ }
+ } else {
+ self.opcode = Opcode::Invalid;
+ }
+ }
+ 0b001 => {
+ self.opcode = Opcode::SYS;
+ panic!("TODO");
+ }
+ 0b010 |
+ 0b011 => {
+ self.opcode = Opcode::MSRb(word & 0x0fffff);
+ }
+ 0b100 => {
+ self.opcode = Opcode::Invalid;
+ }
+ 0b101 => {
+ self.opcode = Opcode::SYSL;
+ panic!("TODO");
+ }
+ 0b110 |
+ 0b111 => {
+ self.opcode = Opcode::MRS(word & 0x0fffff);
+ }
+ _ => {
+ self.opcode = Opcode::Invalid;
+ }
+ }
+ }
+ },
+ 0b11010 => { // unconditional branch (reg)
+ // actually the low 3 bits of opc
+ let opc = (word >> 21) & 0x7;
+ match opc {
+ 0b000 => {
+ if (word & 0x1ffc1f) == 0x1f0000 {
+ let Rn = (word >> 5) & 0x1f;
+ self.opcode = Opcode::BR;
+ self.operands = [
+ Operand::Register(SizeCode::X, Rn as u16),
+ Operand::Nothing,
+ Operand::Nothing,
+ Operand::Nothing
+ ];
+ } else {
+ self.opcode = Opcode::Invalid;
+ }
+ },
+ 0b001 => {
+ if (word & 0x1ffc1f) == 0x1f0000 {
+ let Rn = (word >> 5) & 0x1f;
+ self.opcode = Opcode::BLR;
+ self.operands = [
+ Operand::Register(SizeCode::X, Rn as u16),
+ Operand::Nothing,
+ Operand::Nothing,
+ Operand::Nothing
+ ];
+ } else {
+ self.opcode = Opcode::Invalid;
+ }
+ },
+ 0b010 => {
+ if (word & 0x1ffc1f) == 0x1f0000 {
+ let Rn = (word >> 5) & 0x1f;
+ self.opcode = Opcode::RET;
+ self.operands = [
+ Operand::Register(SizeCode::X, Rn as u16),
+ Operand::Nothing,
+ Operand::Nothing,
+ Operand::Nothing
+ ];
+ } else {
+ self.opcode = Opcode::Invalid;
+ }
+ },
+ 0b100 => {
+ if (word & 0x1fffff) == 0x1f03e0 {
+ self.opcode = Opcode::ERET;
+ } else {
+ self.opcode = Opcode::Invalid;
+ }
+ },
+ 0b101 => {
+ if (word & 0x1fffff) == 0x1f03e0 {
+ self.opcode = Opcode::DRPS;
+ } else {
+ self.opcode = Opcode::Invalid;
+ }
+ },
+ _ => {
+ self.opcode = Opcode::Invalid;
+ }
+ }
+ }
+ 0b11011 => { // unconditional branch (reg)
+ // the last 1 is bit 24, which C3.2.7 indicates are
+ // all invalid encodings (opc is b0101 or lower)
+ self.opcode = Opcode::Invalid;
+ }
+ _ => {
+ // TODO: invalid
+ panic!("Illegal instruction");
+ }
+ }
+ },
+ };
+
+ Some(())
+ }
+}
generated by cgit v1.1 at 2025-10-31 19:00:13 +0000