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artiq-zynq/src/libunwind/backtrace.rs

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Rust
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use libc::{c_int, c_void};
use crate::libunwind as uw;
const UW_REG_SP: c_int = 13;
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 "C" 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;
}
(trace_context.step_fn)(uw::_Unwind_GetIP(context));
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),
}
}
}