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use std::{fmt::Display, fs::File, io::Read};
use macho_unwind_info::opcodes::{OpcodeArm64, OpcodeX86, OpcodeX86_64};
use macho_unwind_info::UnwindInfo;
use object::{Architecture, ObjectSection};
fn main() {
let mut args = std::env::args().skip(1);
if args.len() < 1 {
eprintln!("Usage: {} <path> <pc>", std::env::args().next().unwrap());
std::process::exit(1);
}
let path = args.next().unwrap();
let pc = args.next().unwrap();
let pc: u32 = if let Some(hexstr) = pc.strip_prefix("0x") {
u32::from_str_radix(hexstr, 16).unwrap()
} else {
pc.parse().unwrap()
};
let mut data = Vec::new();
let mut file = File::open(path).unwrap();
file.read_to_end(&mut data).unwrap();
let data = &data[..];
let file = object::File::parse(data).expect("Could not parse object file");
use object::Object;
let unwind_info_data_section = file
.section_by_name_bytes(b"__unwind_info")
.expect("Could not find __unwind_info section");
let data = unwind_info_data_section.data().unwrap();
let arch = file.architecture();
let unwind_info = UnwindInfo::parse(data).unwrap();
let function = match unwind_info.lookup(pc) {
Ok(Some(f)) => f,
Ok(None) => {
println!("No entry was found for address 0x{:x}", pc);
std::process::exit(1);
}
Err(e) => {
println!(
"There was an error when looking up address 0x{:x}: {}",
pc, e
);
std::process::exit(1);
}
};
print_entry(function.start_address, function.opcode, arch);
}
fn print_entry(address: u32, opcode: u32, arch: Architecture) {
match arch {
Architecture::I386 => print_entry_impl(address, OpcodeX86::parse(opcode)),
Architecture::X86_64 => print_entry_impl(address, OpcodeX86_64::parse(opcode)),
Architecture::Aarch64 => print_entry_impl(address, OpcodeArm64::parse(opcode)),
_ => {}
}
}
fn print_entry_impl(address: u32, opcode: impl Display) {
println!(
"Found entry with function address 0x{:08x} and opcode {}",
address, opcode
);
}