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use std::io::Read;
use std::ffi::CStr;
#[repr(C)]
#[derive(Debug)]
struct PPCD_CB {
pc: u64,
instr: u32,
_pad: u32,
mnemonic: [u8; 16],
operands: [u8; 64],
immed: u32,
r: [i32; 4],
target: u64,
iclass: i32,
}
const PPC_DISA_ILLEGAL: i32 = 0x1000;
unsafe extern "C" {
fn PPCDisasm(dis_out: *mut PPCD_CB);
}
fn dolphin_dis(address: u32, code: u32) -> Option<String> {
let mut dis = PPCD_CB {
pc: address as u64,
instr: code,
_pad: 0,
mnemonic: [0; 16],
operands: [0; 64],
immed: 0,
r: [0; 4],
target: 0,
iclass: 0,
};
unsafe {
PPCDisasm(&mut dis)
}
if dis.iclass == PPC_DISA_ILLEGAL {
return None;
}
let mnemonic = unsafe { CStr::from_ptr(dis.mnemonic.as_ptr() as *const _) };
let operands = unsafe { CStr::from_ptr(dis.operands.as_ptr() as *const _) };
let mnemonic = mnemonic.to_str().expect("can unwrap");
let operands = operands.to_str().expect("can unwrap");
Some(format!("{} {}", mnemonic, operands))
}
pub fn main() {
let mut args = std::env::args();
args.next().expect("exists");
let hex0 = args.next().expect("byte 0");
if hex0.trim() == "-" {
dis_stdin();
return;
}
let hex1 = args.next().expect("byte 1");
let hex2 = args.next().expect("byte 2");
let hex3 = args.next().expect("byte 3");
let bs: [u8; 4] = [
u8::from_str_radix(&hex0, 16).expect("byte 0 parses"),
u8::from_str_radix(&hex1, 16).expect("byte 1 parses"),
u8::from_str_radix(&hex2, 16).expect("byte 2 parses"),
u8::from_str_radix(&hex3, 16).expect("byte 3 parses"),
];
dis_bytes(bs);
}
fn dis_stdin() {
let mut buf = Vec::new();
std::io::stdin().read_to_end(&mut buf).expect("can read");
for i in 0..buf.len() / 4 {
let bs: [u8; 4] = buf[i * 4..][..4].try_into().expect("four bytes");
dis_bytes(u32::from_le_bytes(bs).to_be_bytes());
}
}
fn dis_bytes(bs: [u8; 4]) {
let word = u32::from_be_bytes(bs);
if let Some(ok) = dolphin_dis(0x00000004, word) {
println!("{}", ok.as_str());
} else {
println!(".long 0x{:08x}", word);
}
}
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