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use super::usercalls::alloc::UserRef;
use crate::cmp;
use crate::io::{self, Write};
use crate::mem;
extern "C" {
fn take_debug_panic_buf_ptr() -> *mut u8;
static DEBUG: u8;
}
pub(crate) struct SgxPanicOutput(Option<&'static mut UserRef<[u8]>>);
fn empty_user_slice() -> &'static mut UserRef<[u8]> {
unsafe { UserRef::from_raw_parts_mut(1 as *mut u8, 0) }
}
impl SgxPanicOutput {
pub(crate) fn new() -> Option<Self> {
if unsafe { DEBUG == 0 } { None } else { Some(SgxPanicOutput(None)) }
}
fn init(&mut self) -> &mut &'static mut UserRef<[u8]> {
self.0.get_or_insert_with(|| unsafe {
let ptr = take_debug_panic_buf_ptr();
if ptr.is_null() { empty_user_slice() } else { UserRef::from_raw_parts_mut(ptr, 1024) }
})
}
}
impl Write for SgxPanicOutput {
fn write(&mut self, src: &[u8]) -> io::Result<usize> {
let dst = mem::replace(self.init(), empty_user_slice());
let written = cmp::min(src.len(), dst.len());
dst[..written].copy_from_enclave(&src[..written]);
self.0 = Some(&mut dst[written..]);
Ok(written)
}
fn flush(&mut self) -> io::Result<()> {
Ok(())
}
}
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