forked from AbleOS/holey-bytes
95 lines
2.7 KiB
Rust
95 lines
2.7 KiB
Rust
//! Holey Bytes Experimental Runtime
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mod mem;
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use {
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hbvm::{mem::Address, Vm, VmRunOk},
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nix::sys::mman::{mmap, MapFlags, ProtFlags},
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std::{env::args, fs::File, num::NonZeroUsize, process::exit},
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};
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fn main() -> Result<(), Box<dyn std::error::Error>> {
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eprintln!("== HB×RT (Holey Bytes Linux Runtime) v0.1 ==");
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eprintln!("[W] Currently supporting only flat images");
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let Some(image_path) = args().nth(1) else {
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eprintln!("[E] Missing image path");
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exit(1);
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};
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// Load program
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eprintln!("[I] Loading image from \"{image_path}\"");
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let file = File::open(image_path)?;
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let ptr = unsafe {
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mmap(
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None,
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NonZeroUsize::new(file.metadata()?.len() as usize).ok_or("File is empty")?,
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ProtFlags::PROT_READ,
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MapFlags::MAP_PRIVATE,
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Some(&file),
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0,
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)?
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};
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eprintln!("[I] Image loaded at {ptr:p}");
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// Execute program
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let mut vm = unsafe { Vm::<_, 0>::new(mem::HostMemory, Address::new(ptr as u64)) };
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// Memory access fault handling
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unsafe {
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use nix::sys::signal;
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extern "C" fn action(
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_: std::ffi::c_int,
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info: *mut nix::libc::siginfo_t,
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_: *mut std::ffi::c_void,
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) {
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unsafe {
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eprintln!("[E] Memory access fault at {:p}", (*info).si_addr());
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exit(2);
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}
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}
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signal::sigaction(
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signal::Signal::SIGSEGV,
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&nix::sys::signal::SigAction::new(
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signal::SigHandler::SigAction(action),
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signal::SaFlags::SA_NODEFER,
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nix::sys::signalfd::SigSet::empty(),
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),
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)?;
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}
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let stat = loop {
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match vm.run() {
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Ok(VmRunOk::Breakpoint) => eprintln!(
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"[I] Hit breakpoint\nIP: {}\n== Registers ==\n{:?}",
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vm.pc, vm.registers
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),
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Ok(VmRunOk::Timer) => (),
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Ok(VmRunOk::Ecall) => unsafe {
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std::arch::asm!(
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"syscall",
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inlateout("rax") vm.registers[1].0,
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in("rdi") vm.registers[2].0,
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in("rsi") vm.registers[3].0,
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in("rdx") vm.registers[4].0,
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in("r10") vm.registers[5].0,
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in("r8") vm.registers[6].0,
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in("r9") vm.registers[7].0,
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)
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},
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Ok(VmRunOk::End) => break Ok(()),
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Err(e) => break Err(e),
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}
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};
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eprintln!("\n== Registers ==\n{:?}", vm.registers);
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if let Err(e) = stat {
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eprintln!("\n[E] Runtime error: {e:?}");
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exit(2);
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}
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Ok(())
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}
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