disasm: move functions to their own module

This moves disassembler functions into their own module.

Signed-off-by: Sean Cross <sean@xobs.io>
This commit is contained in:
Sean Cross 2020-08-06 16:42:58 +08:00
parent f3cfc9e94b
commit 78a2fd2deb
2 changed files with 102 additions and 0 deletions

100
src/disasm.rs Normal file
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@ -0,0 +1,100 @@
pub enum Operand {
Register(i32),
Constant(i32),
}
impl Operand {
pub fn from_i32_r(op: i32) -> Operand {
if (op >> 5) & 1 == 0 {
Operand::Register(op & (32 - 1))
} else {
Operand::Constant(op & (32 - 1))
}
}
pub fn from_i32_w(op: i32) -> Operand {
Operand::Register(op & (32 - 1))
}
}
#[cfg(feature = "std")]
impl std::fmt::Display for Operand {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
use Operand::*;
match self {
Register(r) => write!(f, "%{}", r),
Constant(c) => write!(f, "#{}", c),
}
}
}
pub enum Opcode {
PSA(Operand, Operand),
PSB(Operand, Operand),
MSK(Operand, Operand),
XOR,
NOT,
ADD(Operand, Operand, Operand),
SUB,
MUL,
TRD,
BRZ(Operand, i32),
UDF,
}
impl Opcode {
pub fn from_i32(op: i32) -> Opcode {
match op & (32 - 1) {
0 => Opcode::PSA(Operand::from_i32_r(op >> 6), Operand::from_i32_w(op >> 18)),
1 => Opcode::PSB(Operand::from_i32_r(op >> 6), Operand::from_i32_w(op >> 18)),
2 => Opcode::MSK(Operand::from_i32_r(op >> 6), Operand::from_i32_r(op >> 12)),
3 => Opcode::XOR,
4 => Opcode::NOT,
5 => Opcode::ADD(
Operand::from_i32_r(op >> 6),
Operand::from_i32_r(op >> 12),
Operand::from_i32_w(op >> 18),
),
6 => Opcode::SUB,
7 => Opcode::MUL,
8 => Opcode::TRD,
9 => Opcode::BRZ(Operand::from_i32_r(op >> 6), op >> 23),
_ => Opcode::UDF,
}
}
}
#[cfg(feature = "std")]
impl std::fmt::Display for Opcode {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
use Opcode::*;
match self {
PSA(ra, rd) => write!(f, "PSA {}, {}", ra, rd),
PSB(ra, rd) => write!(f, "PSB {}, {}", ra, rd),
MSK(ra, rb) => write!(f, "MSK {}, {}", ra, rb),
XOR => write!(f, "XOR"),
NOT => write!(f, "NOT"),
ADD(ra, rb, rd) => write!(f, "ADD {}, {}, {}", rd, ra, rb),
SUB => write!(f, "SUB"),
MUL => write!(f, "MUL"),
TRD => write!(f, "TRD"),
BRZ(ra, rb) => write!(f, "BRZ {}, {}", rb, ra),
_ => write!(f, "invalid"),
}
}
}
#[cfg(feature = "std")]
pub fn print_opcode(op: i32) {
println!(
"{:09b} {:05b} {:01b} {:05b} {:01b} {:05b} {:05b} | {}",
(op >> 23) & (512 - 1),
(op >> 18) & (32 - 1),
(op >> 17) & 1,
(op >> 12) & (32 - 1),
(op >> 11) & 1,
(op >> 6) & (32 - 1),
op & (32 - 1),
Opcode::from_i32(op),
);
}

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@ -3,6 +3,8 @@
#[cfg(feature = "macro-debug")] #[cfg(feature = "macro-debug")]
trace_macros! {true} trace_macros! {true}
pub mod disasm;
/* /*
opcodes opcodes