Expand description
Report panic messages to the host stderr using semihosting
This crate contains an implementation of panic_fmt
that logs panic messages to the host stderr
using cortex-m-semihosting
. Before logging the message the panic handler disables (masks)
the device specific interrupts. After logging the message the panic handler trigger a breakpoint
and then goes into an infinite loop.
Currently, this crate only supports the ARM Cortex-M architecture.
§Usage
#![no_std]
extern crate panic_semihosting;
fn main() {
panic!("FOO")
}
(gdb) monitor arm semihosting enable
(gdb) continue
Program received signal SIGTRAP, Trace/breakpoint trap.
rust_begin_unwind (args=..., file=..., line=8, col=5)
at $CRATE/src/lib.rs:69
69 asm::bkpt();
$ openocd -f (..)
(..)
panicked at 'FOO', src/main.rs:6:5
§Optional features
§exit
When this feature is enabled the panic handler performs an exit semihosting call after logging the panic message. This is useful when emulating the program on QEMU as it causes the QEMU process to exit with a non-zero exit code; thus it can be used to implement Cortex-M tests that run on the host.
We discourage using this feature when the program will run on hardware as the exit call can leave the hardware debugger in an inconsistent state.