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Solve the issue of not being able to override existing builtin functions under LTO. #728

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Solve the issue of not being able to override existing builtin functions under LTO. #728

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90fa854
Add the `weak-intrinsics` feature to compiler_builtins.
DianQK Dec 17, 2023
99a0ebd
Add intrinsics support for the optional return value.
DianQK Dec 17, 2023
a215988
Add the `naked` attribute of intrinsics
DianQK Dec 17, 2023
36244e6
Change `division_function` to use the `naked` function
DianQK Dec 17, 2023
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1 change: 1 addition & 0 deletions rp2040-hal/Cargo.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,7 @@ targets = ["thumbv6m-none-eabi"]
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
compiler_builtins = { version = "0.1.104", features = ["weak-intrinsics"] }
cortex-m = "0.7.2"
embedded-hal = { version = "0.2.5", features = ["unproven"] }
eh1_0_alpha = { package = "embedded-hal", version = "=1.0.0-rc.1", optional = true }
Expand Down
83 changes: 53 additions & 30 deletions rp2040-hal/src/intrinsics.rs
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@@ -1,46 +1,46 @@
/// Generate a series of aliases for an intrinsic function.
macro_rules! intrinsics_aliases {
(
extern $abi:tt fn $name:ident( $($argname:ident: $ty:ty),* ) -> $ret:ty,
extern $abi:tt fn $name:ident( $($argname:ident: $ty:ty),* ) $(-> $ret:ty)?,
) => {};
(
unsafe extern $abi:tt fn $name:ident( $($argname:ident: $ty:ty),* ) -> $ret:ty,
unsafe extern $abi:tt fn $name:ident( $($argname:ident: $ty:ty),* ) $(-> $ret:ty)?,
) => {};

(
extern $abi:tt fn $name:ident( $($argname:ident: $ty:ty),* ) -> $ret:ty,
extern $abi:tt fn $name:ident( $($argname:ident: $ty:ty),* ) $(-> $ret:ty)?,
$alias:ident
$($rest:ident)*
) => {
#[cfg(all(target_arch = "arm", not(feature = "disable-intrinsics")))]
mod $alias {
#[no_mangle]
pub extern $abi fn $alias( $($argname: $ty),* ) -> $ret {
pub extern $abi fn $alias( $($argname: $ty),* ) $(-> $ret)? {
super::$name($($argname),*)
}
}

intrinsics_aliases! {
extern $abi fn $name( $($argname: $ty),* ) -> $ret,
extern $abi fn $name( $($argname: $ty),* ) $(-> $ret)?,
$($rest)*
}
};

(
unsafe extern $abi:tt fn $name:ident( $($argname:ident: $ty:ty),* ) -> $ret:ty,
unsafe extern $abi:tt fn $name:ident( $($argname:ident: $ty:ty),* ) $(-> $ret:ty)?,
$alias:ident
$($rest:ident)*
) => {
#[cfg(all(target_arch = "arm", not(feature = "disable-intrinsics")))]
mod $alias {
#[no_mangle]
unsafe extern $abi fn $alias( $($argname: $ty),* ) -> $ret {
unsafe extern $abi fn $alias( $($argname: $ty),* ) $(-> $ret)? {
super::$name($($argname),*)
}
}

intrinsics_aliases! {
unsafe extern $abi fn $name( $($argname: $ty),* ) -> $ret,
unsafe extern $abi fn $name( $($argname: $ty),* ) $(-> $ret)?,
$($rest)*
}
};
Expand Down Expand Up @@ -88,7 +88,7 @@ macro_rules! intrinsics {
(
#[slower_than_default]
$(#[$($attr:tt)*])*
extern $abi:tt fn $name:ident( $($argname:ident: $ty:ty),* ) -> $ret:ty {
extern $abi:tt fn $name:ident( $($argname:ident: $ty:ty),* ) $(-> $ret:ty)? {
$($body:tt)*
}

Expand All @@ -97,7 +97,7 @@ macro_rules! intrinsics {
// Not exported, but defined so the actual implementation is
// considered used
#[allow(dead_code)]
fn $name( $($argname: $ty),* ) -> $ret {
fn $name( $($argname: $ty),* ) $(-> $ret)? {
$($body)*
}

Expand All @@ -107,7 +107,7 @@ macro_rules! intrinsics {
(
#[bootrom_v2]
$(#[$($attr:tt)*])*
extern $abi:tt fn $name:ident( $($argname:ident: $ty:ty),* ) -> $ret:ty {
extern $abi:tt fn $name:ident( $($argname:ident: $ty:ty),* ) $(-> $ret:ty)? {
$($body:tt)*
}

Expand All @@ -117,14 +117,14 @@ macro_rules! intrinsics {
// considered used
#[cfg(not(feature = "rom-v2-intrinsics"))]
#[allow(dead_code)]
fn $name( $($argname: $ty),* ) -> $ret {
fn $name( $($argname: $ty),* ) $(-> $ret)? {
$($body)*
}

#[cfg(feature = "rom-v2-intrinsics")]
intrinsics! {
$(#[$($attr)*])*
extern $abi fn $name( $($argname: $ty),* ) -> $ret {
extern $abi fn $name( $($argname: $ty),* ) $(-> $ret)? {
$($body)*
}
}
Expand All @@ -135,21 +135,21 @@ macro_rules! intrinsics {
(
#[alias = $($alias:ident),*]
$(#[$($attr:tt)*])*
extern $abi:tt fn $name:ident( $($argname:ident: $ty:ty),* ) -> $ret:ty {
extern $abi:tt fn $name:ident( $($argname:ident: $ty:ty),* ) $(-> $ret:ty)? {
$($body:tt)*
}

$($rest:tt)*
) => {
intrinsics! {
$(#[$($attr)*])*
extern $abi fn $name( $($argname: $ty),* ) -> $ret {
extern $abi fn $name( $($argname: $ty),* ) $(-> $ret)? {
$($body)*
}
}

intrinsics_aliases! {
extern $abi fn $name( $($argname: $ty),* ) -> $ret,
extern $abi fn $name( $($argname: $ty),* ) $(-> $ret)?,
$($alias) *
}

Expand All @@ -159,21 +159,21 @@ macro_rules! intrinsics {
(
#[alias = $($alias:ident),*]
$(#[$($attr:tt)*])*
unsafe extern $abi:tt fn $name:ident( $($argname:ident: $ty:ty),* ) -> $ret:ty {
unsafe extern $abi:tt fn $name:ident( $($argname:ident: $ty:ty),* ) $(-> $ret:ty)? {
$($body:tt)*
}

$($rest:tt)*
) => {
intrinsics! {
$(#[$($attr)*])*
unsafe extern $abi fn $name( $($argname: $ty),* ) -> $ret {
unsafe extern $abi fn $name( $($argname: $ty),* ) $(-> $ret)? {
$($body)*
}
}

intrinsics_aliases! {
unsafe extern $abi fn $name( $($argname: $ty),* ) -> $ret,
unsafe extern $abi fn $name( $($argname: $ty),* ) $(-> $ret)?,
$($alias) *
}

Expand All @@ -183,21 +183,21 @@ macro_rules! intrinsics {
(
#[aeabi = $($alias:ident),*]
$(#[$($attr:tt)*])*
extern $abi:tt fn $name:ident( $($argname:ident: $ty:ty),* ) -> $ret:ty {
extern $abi:tt fn $name:ident( $($argname:ident: $ty:ty),* ) $(-> $ret:ty)? {
$($body:tt)*
}

$($rest:tt)*
) => {
intrinsics! {
$(#[$($attr)*])*
extern $abi fn $name( $($argname: $ty),* ) -> $ret {
extern $abi fn $name( $($argname: $ty),* ) $(-> $ret)? {
$($body)*
}
}

intrinsics_aliases! {
extern "aapcs" fn $name( $($argname: $ty),* ) -> $ret,
extern "aapcs" fn $name( $($argname: $ty),* ) $(-> $ret)?,
$($alias) *
}

Expand All @@ -206,23 +206,23 @@ macro_rules! intrinsics {

(
$(#[$($attr:tt)*])*
extern $abi:tt fn $name:ident( $($argname:ident: $ty:ty),* ) -> $ret:ty {
extern $abi:tt fn $name:ident( $($argname:ident: $ty:ty),* ) $(-> $ret:ty)? {
$($body:tt)*
}

$($rest:tt)*
) => {
#[cfg(all(target_arch = "arm", not(feature = "disable-intrinsics")))]
$(#[$($attr)*])*
extern $abi fn $name( $($argname: $ty),* ) -> $ret {
extern $abi fn $name( $($argname: $ty),* ) $(-> $ret)? {
$($body)*
}

#[cfg(all(target_arch = "arm", not(feature = "disable-intrinsics")))]
mod $name {
#[no_mangle]
$(#[$($attr)*])*
pub extern $abi fn $name( $($argname: $ty),* ) -> $ret {
pub extern $abi fn $name( $($argname: $ty),* ) $(-> $ret)? {
super::$name($($argname),*)
}
}
Expand All @@ -231,32 +231,55 @@ macro_rules! intrinsics {
// considered used
#[cfg(not(all(target_arch = "arm", not(feature = "disable-intrinsics"))))]
#[allow(dead_code)]
fn $name( $($argname: $ty),* ) -> $ret {
fn $name( $($argname: $ty),* ) $(-> $ret)? {
$($body)*
}

intrinsics!($($rest)*);
};

// Naked functions are special: we can't generate wrappers for them since
// they use a custom calling convention.
(
#[naked]
$(#[$($attr:tt)*])*
unsafe extern $abi:tt fn $name:ident( $($argname:ident: $ty:ty),* ) -> $ret:ty {
unsafe extern $abi:tt fn $name:ident( $($argname:ident: $ty:ty),* ) $(-> $ret:ty)? {
$($body:tt)*
}

$($rest:tt)*
) => (
mod $name {
#[naked]
$(#[$($attr)*])*
#[no_mangle]
pub unsafe extern $abi fn $name( $($argname: $ty),* ) $(-> $ret)? {
$($body)*
}
}

intrinsics!($($rest)*);
);

(
$(#[$($attr:tt)*])*
unsafe extern $abi:tt fn $name:ident( $($argname:ident: $ty:ty),* ) $(-> $ret:ty)? {
$($body:tt)*
}

$($rest:tt)*
) => {
#[cfg(all(target_arch = "arm", not(feature = "disable-intrinsics")))]
$(#[$($attr)*])*
unsafe extern $abi fn $name( $($argname: $ty),* ) -> $ret {
unsafe extern $abi fn $name( $($argname: $ty),* ) $(-> $ret)? {
$($body)*
}

#[cfg(all(target_arch = "arm", not(feature = "disable-intrinsics")))]
mod $name {
#[no_mangle]
$(#[$($attr)*])*
pub unsafe extern $abi fn $name( $($argname: $ty),* ) -> $ret {
pub unsafe extern $abi fn $name( $($argname: $ty),* ) $(-> $ret)? {
super::$name($($argname),*)
}
}
Expand All @@ -265,7 +288,7 @@ macro_rules! intrinsics {
// considered used
#[cfg(not(all(target_arch = "arm", not(feature = "disable-intrinsics"))))]
#[allow(dead_code)]
unsafe fn $name( $($argname: $ty),* ) -> $ret {
unsafe fn $name( $($argname: $ty),* ) $(-> $ret)? {
$($body)*
}

Expand Down
2 changes: 2 additions & 0 deletions rp2040-hal/src/lib.rs
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Expand Up @@ -37,6 +37,7 @@

#![warn(missing_docs)]
#![no_std]
#![feature(naked_functions)]
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Is my understanding correct that this is not stable yet ?

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Yeah, it's only on nightly. Are we going to use it on stable too?

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This library targets stable rust, yes. So nightly features can't be used.

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It seems that even stabilizing naked is not enough. Using compiler_builtins requires nightly.
But we can change it to default weak in rust. I think the key here is still to stabilize the naked first.

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Could you please help me verify that the current modification works?

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Sure, what can I do?
Currently, it doesn't build. Obviously not with stable, but I also get errors with nightly:

$ cargo +nightly build --release
[...]
   Compiling rp2040-hal v0.9.1 (/home/jan/rp2040/rp-rs/rp-hal/rp2040-hal)
error: invalid instruction
   --> rp2040-hal/src/sio.rs:299:22
    |
299 |                     "hwdivider_head",
    |                      ^
    |
note: instantiated into assembly here
   --> <inline asm>:1:2
    |
1   |     hwdivider_head
    |     ^
[...]

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I'm not sure about this error yet. But I was able to compile it successfully at https://github.com/rp-rs/rp2040-project-template. I also need add compiler_builtins = { version = "0.1.104", features = ["weak-intrinsics"] } to the rp2040-project-template.


#[doc(hidden)]
pub use paste;
Expand Down Expand Up @@ -94,6 +95,7 @@ pub use sio::Sio;
pub use spi::Spi;
pub use timer::Timer;
pub use watchdog::Watchdog;
extern crate compiler_builtins;
// Re-export crates used in rp2040-hal's public API
pub extern crate fugit;

Expand Down
39 changes: 21 additions & 18 deletions rp2040-hal/src/sio.rs
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Expand Up @@ -278,29 +278,32 @@ core::arch::global_asm!(

macro_rules! division_function {
(
$name:ident $($intrinsic:ident)* ( $argty:ty ) {
$name:ident $intrinsic:ident $intrinsic_alias:ident ( $argty:ty ) {
$($begin:literal),+
}
) => {
#[cfg(all(target_arch = "arm", not(feature = "disable-intrinsics")))]
core::arch::global_asm!(
// Mangle the name slightly, since this is a global symbol.
concat!(".global _rphal_", stringify!($name)),
concat!(".type _rphal_", stringify!($name), ", %function"),
".align 2",
concat!("_rphal_", stringify!($name), ":"),
$(
concat!(".global ", stringify!($intrinsic)),
concat!(".type ", stringify!($intrinsic), ", %function"),
concat!(stringify!($intrinsic), ":"),
)*

"hwdivider_head",
$($begin),+ ,
"hwdivider_tail",
);
intrinsics! {
#[naked]
unsafe extern "C" fn $intrinsic() {
core::arch::asm!(
"hwdivider_head",
$($begin),+ ,
"hwdivider_tail",
options(noreturn)
);
}
#[naked]
unsafe extern "C" fn $intrinsic_alias() {
core::arch::asm!(
"hwdivider_head",
$($begin),+ ,
"hwdivider_tail",
options(noreturn)
);
}
}

#[cfg(all(target_arch = "arm", feature = "disable-intrinsics"))]
core::arch::global_asm!(
// Mangle the name slightly, since this is a global symbol.
concat!(".global _rphal_", stringify!($name)),
Expand Down
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