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Mention that we need to enable the abi_x86_interrupt feature (#318)

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Philipp Oppermann
2017-04-18 15:23:22 +02:00
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parent f94062a9d5
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blog/content/post/09-handling-exceptions.md
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@@ -248,6 +248,25 @@ extern "x86-interrupt" fn breakpoint_handler(
Our handler just outputs a message and pretty-prints the exception stack frame.
When we try to compile it, the following error occurs:
```
error: x86-interrupt ABI is experimental and subject to change (see issue #40180)
--> src/interrupts.rs:8:1
|
8 | extern "x86-interrupt" fn breakpoint_handler(
| _^ starting here...
9 | | stack_frame: &mut ExceptionStackFrame)
10 | | {
11 | | println!("EXCEPTION: BREAKPOINT\n{:#?}", stack_frame);
12 | | }
| |_^ ...ending here
|
= help: add #![feature(abi_x86_interrupt)] to the crate attributes to enable
```
This error occurs because the `x86-interrupt` calling convention is still unstable. To use it anyway, we have to explicitly enable it by adding `#![feature(abi_x86_interrupt)]` on the top of our `lib.rs`.
### Loading the IDT
In order that the CPU uses our new interrupt descriptor table, we need to load it using the [`lidt`] instruction. The `Idt` struct of the `x86_64` provides a [`load`][Idt::load] method function for that. Let's try to use it: