Join global_asm macro invocations

[jannic]

Fixes #321

I intentionally didn't update the indentation, for two reasons:

1. I don't even know how this should be indented
2. This way it's easier to review

If you'd prefer some certain way of indenting the conditional blocks inside the cfg_global_asm! call, I'll happily update the pull request.

[rmsyn]

Minor clippy fix:

https://github.com/rust-embedded/riscv/actions/runs/16010020609/job/45165521521?pr=322

Otherwise, LGTM.

[romancardenas]

Minor clippy fix:

https://github.com/rust-embedded/riscv/actions/runs/16010020609/job/45165521521?pr=322

Otherwise, LGTM.

is_multiple_of came with Rust 1.87: https://doc.rust-lang.org/std/primitive.usize.html#method.is_multiple_of

Bumping the MSRV to make Nightly Clippy happy seems too much. Currently, Nightly builds and checks are marked as experimental, and it is OK to merge PRs with reasonable failures in Nightly.

I'm CC'ing @gibbz00 , as he mentioned that it might be possible to "relax" a bit Nightly clippy requirements

[romancardenas]

LGTM! Thank you.

There are a few core::arch::global_asm! calls in the macros and at the end of asm.rs, but all of these blobs specify a section, so I guess it is not UB? We don't need them to be in a specific memory location or order, as long as they are in their corresponding section. In this case, the linker will do the hard work.

[gibbz00]

I'm CC'ing @gibbz00 , as he mentioned that it might be possible to "relax" a bit Nightly clippy requirements

clippy::manual_is_multiple_of is unfortunately part of the "complexity" lint group, whose default lint level is "warn". I would suggest adding an #[allow(clippy::manual_is_multiple_of, reason = "requires MSRV bump")] for now. Relaxing clippy lints would entail removing this line:

riscv/.github/workflows/clippy.yaml

Line 10 in cdae64a

CLIPPY_PARAMS: -W clippy::all -W clippy::pedantic -W clippy::nursery -W clippy::cargo

(Concise lint group explanation here: https://github.com/rust-lang/rust-clippy?tab=readme-ov-file#clippy)

That is, the general lint policy should IMO be;

• Avoid opting-out of default lints unless there's a strong reason for it. (Like the one above.)
• Selectively opt-in to non-default/allow-by-default lints at the lint level, not lint group level. Ex. by adding -W missing-docs.

[jannic]

Thanks for discussing the clippy warnings. I didn't have time to care about them yesterday. I agree that it doesn't make sense chasing every single new warning on nightly immediately.