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//! Debugging a crash (exception)
//!
//! The `cortex-m-rt` crate provides functionality for this through a default
//! exception handler. When an exception is hit, the default handler will
//! trigger a breakpoint and in this debugging context the stacked registers
//! are accessible.
//!
//! In you run the example below, you'll be able to inspect the state of your
//! program under the debugger using these commands:
//!
//! ```
//! (gdb) # Stacked registers = program state during the crash
//! (gdb) print/x *_sr
//! $1 = cortex_m::exception::StackedRegisters {
//! r0 = 0x2fffffff,
//! r1 = 0x2fffffff,
//! r2 = 0x0,
//! r3 = 0x0,
//! r12 = 0x0,
//! lr = 0x8000443,
//! pc = 0x8000190,
//! xpsr = 0x61000200,
//! }
//!
//! (gdb) # What exception was triggered?
//! (gdb) print _e
//! $2 = cortex_m::exception::Exception::HardFault
//!
//! (gdb) # Where did we come from?
//! (gdb) print _e
//! ```
extern crate cortex_m;
extern crate cortex_m_rt;
use ptr;
use asm;
// As we are not using interrupts, we just register a dummy catch all handler
static INTERRUPTS: = ;
extern "C"