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use std::fmt::Display;
use super::bitfield::OpcodeBitfield;
use crate::raw::consts::*;
#[derive(Copy, Clone, Debug, PartialEq, Eq)]
pub enum OpcodeArm64 {
Null,
Frameless {
stack_size_in_bytes: u16,
},
Dwarf {
eh_frame_fde: u32,
},
FrameBased {
saved_reg_pair_count: u8,
// Whether each register pair was pushed
d14_and_d15_saved: bool,
d12_and_d13_saved: bool,
d10_and_d11_saved: bool,
d8_and_d9_saved: bool,
x27_and_x28_saved: bool,
x25_and_x26_saved: bool,
x23_and_x24_saved: bool,
x21_and_x22_saved: bool,
x19_and_x20_saved: bool,
},
UnrecognizedKind(u8),
}
impl OpcodeArm64 {
pub fn parse(opcode: u32) -> Self {
match OpcodeBitfield::new(opcode).kind() {
OPCODE_KIND_NULL => OpcodeArm64::Null,
OPCODE_KIND_ARM64_FRAMELESS => OpcodeArm64::Frameless {
stack_size_in_bytes: (((opcode >> 12) & 0b1111_1111_1111) as u16) * 16,
},
OPCODE_KIND_ARM64_DWARF => OpcodeArm64::Dwarf {
eh_frame_fde: (opcode & 0xffffff),
},
OPCODE_KIND_ARM64_FRAMEBASED => {
let saved_reg_pair_count = (opcode & 0b1_1111_1111).count_ones() as u8;
OpcodeArm64::FrameBased {
saved_reg_pair_count,
d14_and_d15_saved: ((opcode >> 8) & 1) == 1,
d12_and_d13_saved: ((opcode >> 7) & 1) == 1,
d10_and_d11_saved: ((opcode >> 6) & 1) == 1,
d8_and_d9_saved: ((opcode >> 5) & 1) == 1,
x27_and_x28_saved: ((opcode >> 4) & 1) == 1,
x25_and_x26_saved: ((opcode >> 3) & 1) == 1,
x23_and_x24_saved: ((opcode >> 2) & 1) == 1,
x21_and_x22_saved: ((opcode >> 1) & 1) == 1,
x19_and_x20_saved: (opcode & 1) == 1,
}
}
kind => OpcodeArm64::UnrecognizedKind(kind),
}
}
}
impl Display for OpcodeArm64 {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
OpcodeArm64::Null => {
write!(f, "(uncovered)")?;
}
OpcodeArm64::Frameless {
stack_size_in_bytes,
} => {
if *stack_size_in_bytes == 0 {
write!(f, "CFA=reg31")?;
} else {
write!(f, "CFA=reg31+{}", stack_size_in_bytes)?;
}
}
OpcodeArm64::Dwarf { eh_frame_fde } => {
write!(f, "(check eh_frame FDE 0x{:x})", eh_frame_fde)?;
}
OpcodeArm64::FrameBased {
d14_and_d15_saved,
d12_and_d13_saved,
d10_and_d11_saved,
d8_and_d9_saved,
x27_and_x28_saved,
x25_and_x26_saved,
x23_and_x24_saved,
x21_and_x22_saved,
x19_and_x20_saved,
..
} => {
write!(f, "CFA=reg29+16: reg29=[CFA-16], reg30=[CFA-8]")?;
let mut offset = 32;
let mut next_pair = |pair_saved, a, b| {
if pair_saved {
let r = write!(f, ", {}=[CFA-{}], {}=[CFA-{}]", a, offset, b, offset + 8);
offset += 16;
r
} else {
Ok(())
}
};
next_pair(*d14_and_d15_saved, "reg14", "reg15")?;
next_pair(*d12_and_d13_saved, "reg12", "reg13")?;
next_pair(*d10_and_d11_saved, "reg10", "reg11")?;
next_pair(*d8_and_d9_saved, "reg8", "reg9")?;
next_pair(*x27_and_x28_saved, "reg27", "reg28")?;
next_pair(*x25_and_x26_saved, "reg25", "reg26")?;
next_pair(*x23_and_x24_saved, "reg23", "reg24")?;
next_pair(*x21_and_x22_saved, "reg21", "reg22")?;
next_pair(*x19_and_x20_saved, "reg19", "reg20")?;
}
OpcodeArm64::UnrecognizedKind(kind) => {
write!(f, "!! Unrecognized kind {}", kind)?;
}
}
Ok(())
}
}