Created
June 14, 2024 02:41
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| #[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)] | |
| pub struct HeaderFn<F>(*const core::marker::PhantomData<F>); | |
| impl<F> HeaderFn<F> { | |
| pub const fn from_addr(addr: usize) -> Self { | |
| Self(addr as *const core::marker::PhantomData<F>) | |
| } | |
| pub fn as_addr(&self) -> usize { | |
| self.0 as usize | |
| } | |
| } | |
| macro_rules! fn_impl { | |
| (<$($var:ident),+>, $from_fn:ident, $fn:ty) => { | |
| #[cfg(all(target_arch = "arm", target_os = "none"))] | |
| impl<$($var),+> HeaderFn<$fn> { | |
| pub const fn $from_fn(f: $fn) -> Self { | |
| Self(f as *const core::marker::PhantomData<$fn>) | |
| } | |
| pub unsafe fn as_fn(&self, offset: usize) -> $fn { | |
| core::mem::transmute::<*const (), $fn>( | |
| (offset + self.as_addr()) as *const (), | |
| ) | |
| } | |
| } | |
| } | |
| } | |
| fn_impl!(<R>, from_fn0, extern "C" fn () -> R); | |
| fn_impl!(<A, R>, from_fn1, extern "C" fn(A) -> R); | |
| fn_impl!(<A, B, R>, from_fn2, extern "C" fn(A, B) -> R); | |
| fn_impl!(<A, B, C, R>, from_fn3, extern "C" fn(A, B, C) -> R); | |
| fn_impl!(<A, B, C, D, R>, from_fn4, extern "C" fn(A, B, C, D) -> R); |
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