RISC-V OS using Rust: Filesystems

Re:RISC-V OS using Rust: Filesystems by pavehawk2007 on Tuesday May 12, 2020 @01:29PM (#23156801)

Hello, all signs point to no. I've seen many threads about stabilizing asm, but most seem to say no this won't happen. In fact, the Rust compiler now throws a warning that asm!() is deprecated in favor of llvm_asm!().

This is the only reason I am still using nightly builds...because I'm forced to use the asm language feature, which is unstable, and because it's unstable, it cannot be used on the stable channel.

Edit: to respond to the second half, for out-of-the-box Rust builds, yes, I need global_asm! and asm!. However, asm! is for inline assembly only. Originally, I used GNU's assembler to assemble and then linked using GNU's ld. However, I have since switched to trying to make Rust do everything through its build manager, cargo.

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Re:RISC-V OS using Rust: Filesystems by jcranmer on Tuesday May 12, 2020 @01:35PM (#23156896)

There is a proposal for a new asm! macro: https://github.com/Amanieu/rfcs/blob/inline-asm/text/0000-in... (note that the last updated date was 2 days ago, as of the time of this comment).

It looks like what you're referring to is the interim plan to rename asm! to llvm_asm! (which will never be stabilized), since it's a very thin wrapper over the current LLVM inline asm support, and then replace asm! with a better implementation.

There is a working group specifically for inline asm, so it will happen eventually... but it's not going to be a quick process--think about how long async/await takes, and inline asm is actually rather close to that in terms of all the issues that come out of it.

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Re:RISC-V OS using Rust: Filesystems by pavehawk2007 on Tuesday May 12, 2020 @01:44PM (#23157040)

Wow, that looks like a lot of work went into this RFC. I'm glad it's being taken seriously, and I anxiously await the outcome--whatever that might be.

Thank you!

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