mirror of https://github.com/m-labs/artiq.git
50 lines
1.4 KiB
Rust
50 lines
1.4 KiB
Rust
#![feature(libc, panic_unwind)]
|
|
#![no_std]
|
|
|
|
extern crate unwind;
|
|
extern crate libc;
|
|
|
|
use unwind as uw;
|
|
use libc::{c_void, c_int};
|
|
|
|
const UW_REG_SP: c_int = -2;
|
|
|
|
pub fn backtrace<F>(f: F) -> Result<(), uw::_Unwind_Reason_Code>
|
|
where F: FnMut(usize) -> ()
|
|
{
|
|
struct TraceContext<F> {
|
|
step_fn: F,
|
|
prev_sp: uw::_Unwind_Word
|
|
}
|
|
|
|
extern fn trace<F>(context: *mut uw::_Unwind_Context, arg: *mut c_void)
|
|
-> uw::_Unwind_Reason_Code
|
|
where F: FnMut(usize) -> ()
|
|
{
|
|
unsafe {
|
|
let trace_context = &mut *(arg as *mut TraceContext<F>);
|
|
|
|
// Detect the root of a libfringe thread
|
|
let cur_sp = uw::_Unwind_GetGR(context, UW_REG_SP);
|
|
if cur_sp == trace_context.prev_sp {
|
|
return uw::_URC_END_OF_STACK
|
|
} else {
|
|
trace_context.prev_sp = cur_sp;
|
|
}
|
|
|
|
// GetIP gives us the return address, i.e. the address after the delay slot,
|
|
// but we're interested in the call instruction.
|
|
(trace_context.step_fn)(uw::_Unwind_GetIP(context) - 2 * 4);
|
|
uw::_URC_NO_REASON
|
|
}
|
|
}
|
|
|
|
unsafe {
|
|
let mut trace_context = TraceContext { step_fn: f, prev_sp: 0 };
|
|
match uw::_Unwind_Backtrace(trace::<F>, &mut trace_context as *mut _ as *mut c_void) {
|
|
uw::_URC_NO_REASON => Ok(()),
|
|
err => Err(err)
|
|
}
|
|
}
|
|
}
|