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Update qemu.md

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flip111
2019-02-18 20:36:00 +00:00
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commit bdfbc0df91
1 changed files with 4 additions and 7 deletions
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src/start/qemu.md
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@@ -84,7 +84,7 @@ Whenever you see the word "app" you should replace it with the name you selected
for your project. Or, you could also name your project "app" and avoid the
substitutions.
For convenience here's the source code of `src/main.rs`:
For convenience here are the most important parts of the source code in `src/main.rs`:
``` console
$ cat src/main.rs
@@ -94,11 +94,7 @@ $ cat src/main.rs
#![no_std]
#![no_main]
// pick a panicking behavior
extern crate panic_halt; // you can put a breakpoint on `rust_begin_unwind` to catch panics
// extern crate panic_abort; // requires nightly
// extern crate panic_itm; // logs messages over ITM; requires ITM support
// extern crate panic_semihosting; // logs messages to the host stderr; requires a debugger
extern crate panic_halt;
use cortex_m_rt::entry;
@@ -122,7 +118,8 @@ with `no_main` is that using the `main` interface in `no_std` context requires
nightly.
`extern crate panic_halt;`. This crate provides a `panic_handler` that defines
the panicking behavior of the program. More on this later on.
the panicking behavior of the program. We will cover this in more detail in the
[Panicking](panicking.md) chapter of the book.
[`#[entry]`] is an attribute provided by the [`cortex-m-rt`] crate that's used
to mark the entry point of the program. As we are not using the standard `main`