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rename LLVM target for RustyHermit #84930

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merged 1 commit into from
May 7, 2021
Merged

rename LLVM target for RustyHermit #84930

merged 1 commit into from
May 7, 2021

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stlankes
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@stlankes stlankes commented May 4, 2021

  • RustyHermit is a library operating system, where the user-
    and the kernel-space use the same target
  • by a mistake a previous patch changes the target to an incorect value
  • this merge request revert the previous changes

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r? @varkor

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@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label May 4, 2021
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nagisa commented May 5, 2021

Can you please elaborate more on the “why”? Why does it need to be this specific LLVM target? Why was it a mistake to change it to something else previously?

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nagisa commented May 5, 2021

r? @nagisa

@rust-highfive rust-highfive assigned nagisa and unassigned varkor May 5, 2021
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stlankes commented May 5, 2021 •
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RustyHermit ist is a library operating system. In this case, we link a static library as kernel to the application. The final result is a bootable application. The library and the application have to use the same target. Currently, the targets are different (see https://github.com/rust-lang/rust/blob/master/compiler/rustc_target/src/spec/x86_64_unknown_hermit.rs).

We need this spec to disable the usage of FPU registers, which are not allowed in kernel space. In contrast to Linux, everything is running in ring 0 and also in the same address space.

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nagisa commented May 7, 2021

Can you put this explanation in the PR description and/or commit message so that it ends up in the git history? r=me once that's done.

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(comment @bors r=nagisa once that's done)

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bors commented May 7, 2021

✌️ @stlankes can now approve this pull request

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@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels May 7, 2021
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@bors bors added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels May 7, 2021
@stlankes
rename LLVM target for RustyHermit
76f884a 
RustyHermit ist is a library operating system. In this case, we link a static library as kernel to the application. The final result is a bootable application. The library and the application have to use the same target. Currently, the targets are different (see also https://github.com/rust-lang/rust/blob/master/compiler/rustc_target/src/spec/x86_64_unknown_hermit.rs). Consequently, this commit change the LLVM target to 'hermit'.

This kernel spec is needed to disable the usage of FPU registers, which are not allowed in kernel space. In contrast to Linux, everything is running in ring 0 and also in the same address space.

Signed-off-by: Stefan Lankes <slankes@eonerc.rwth-aachen.de>
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stlankes commented May 7, 2021

I revise the commit message. Thanks for your support!

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nagisa commented May 7, 2021

@bors r+

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bors commented May 7, 2021

📌 Commit 76f884a has been approved by nagisa

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels May 7, 2021
@Dylan-DPC-zz Dylan-DPC-zz mentioned this pull request May 7, 2021
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bors added a commit to rust-lang-ci/rust that referenced this pull request May 7, 2021
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Auto merge of rust-lang#85036 - Dylan-DPC:rollup-4qfabo3, r=Dylan-DPC
ca712bc 
Rollup of 9 pull requests

Successful merges:

 - rust-lang#84254 (illumos should put libc last in library search order)
 - rust-lang#84442 (Unify rustc and rustdoc parsing of `cfg()`)
 - rust-lang#84655 (Cleanup of `wasm`)
 - rust-lang#84866 (linker: Avoid library duplication with `/WHOLEARCHIVE`)
 - rust-lang#84930 (rename LLVM target for RustyHermit)
 - rust-lang#84991 (rustc: Support Rust-specific features in -Ctarget-feature)
 - rust-lang#85029 (SGX mutex is movable)
 - rust-lang#85030 (Rearrange SGX split module files)
 - rust-lang#85033 (some further small cleanups)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup
@bors bors merged commit cea6e4d into rust-lang:master May 7, 2021
@rustbot rustbot added this to the 1.54.0 milestone May 7, 2021
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