forked from AbleOS/holey-bytes
87 lines
2.6 KiB
Rust
87 lines
2.6 KiB
Rust
//! Holey Bytes Experimental Runtime
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#![deny(unsafe_op_in_unsafe_fn)]
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mod eca;
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mod mem;
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use {
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hbvm::{mem::Address, Vm, VmRunOk},
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memmap2::Mmap,
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std::{env::args, fs::File, io::Read, mem::MaybeUninit, process::exit},
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};
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type RtVm = Vm<mem::HostMemory, 0>;
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fn main() -> Result<(), Box<dyn std::error::Error>> {
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eprintln!("== HB×RT (Holey Bytes Experimental Runtime) v0.1 ==");
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eprintln!("[W] Currently supporting only flat images");
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let mut args = args().skip(1);
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let Some(image_path) = args.next() else {
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eprintln!("[E] Missing image path");
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exit(1);
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};
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let dsls = args.next().as_deref() == Some("-L");
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if cfg!(not(target_os = "linux")) && dsls {
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eprintln!("[E] Unsupported platform for Direct Linux syscall mode");
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exit(1);
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}
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if dsls {
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eprintln!("[I] Direct Linux syscall mode activated")
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}
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// Allocate stack
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let mut stack = Box::new(MaybeUninit::<[u8; 1024 * 1024 * 2]>::uninit());
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eprintln!("[I] Stack allocated at {:p}", stack.as_ptr());
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// Load program
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eprintln!("[I] Loading image from \"{image_path}\"");
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let file_handle = File::open(image_path)?;
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let mmap = unsafe { Mmap::map(&file_handle) }?;
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eprintln!("[I] Image loaded at {:p}", mmap.as_ptr());
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let mut vm = unsafe { Vm::<_, 0>::new(mem::HostMemory, Address::new(mmap.as_ptr() as u64)) };
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vm.write_reg(254, stack.as_mut_ptr() as u64);
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// Execute program
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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) if dsls => 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::Ecall) => {
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eprintln!("[E] General environment calls not supported");
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exit(1);
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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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