cortex_m/
call_asm.rs

1/// An internal macro to invoke an assembly routine.
2///
3/// Depending on whether the unstable `inline-asm` feature is enabled, this will either call into
4/// the inline assembly implementation directly, or through the FFI shim (see `asm/lib.rs`).
5macro_rules! call_asm {
6    ( $func:ident ( $($args:ident: $tys:ty),* ) $(-> $ret:ty)? ) => {{
7        #[allow(unused_unsafe)]
8        unsafe {
9            match () {
10                #[cfg(feature = "inline-asm")]
11                () => crate::asm::inline::$func($($args),*),
12
13                #[cfg(not(feature = "inline-asm"))]
14                () => {
15                    extern "C" {
16                        fn $func($($args: $tys),*) $(-> $ret)?;
17                    }
18
19                    $func($($args),*)
20                },
21            }
22        }
23    }};
24}