48 lines
1.1 KiB
Rust
48 lines
1.1 KiB
Rust
//! Overriding an exception handler
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//!
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//! You can override an exception handler using the [`exception!`][1] macro.
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//!
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//! [1]: https://docs.rs/cortex-m-rt/0.3.2/cortex_m_rt/macro.exception.html
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//!
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//! The default exception handler can be overridden using the [`default_handler!`][2] macro
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//!
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//! [2]: https://docs.rs/cortex-m-rt/0.3.2/cortex_m_rt/macro.default_handler.html
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//!
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//! ---
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#![feature(used)]
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#![no_std]
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extern crate cortex_m;
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#[macro_use(exception)]
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extern crate cortex_m_rt;
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extern crate panic_abort; // panicking behavior
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use core::ptr;
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use cortex_m::asm;
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fn main() {
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unsafe {
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// Invalid memory access
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ptr::read_volatile(0x2FFF_FFFF as *const u32);
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}
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}
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exception!(HARD_FAULT, handler);
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fn handler() {
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// You'll hit this breakpoint rather than the one in cortex-m-rt
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asm::bkpt()
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}
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// As we are not using interrupts, we just register a dummy catch all handler
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#[allow(dead_code)]
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#[used]
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#[link_section = ".vector_table.interrupts"]
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static INTERRUPTS: [extern "C" fn(); 240] = [default_handler; 240];
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extern "C" fn default_handler() {
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asm::bkpt();
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}
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