use `#[naked]` for `__rust_probestack` #141992

folkertdev · 2025-06-03T23:46:50Z

Let's see if this works now.

Previously this change was in rust-lang/compiler-builtins#897, but we decided to wait until compiler-builtins was a subtree (and also cfg(bootstrap) is gone now).

r? @tgross35 cc @bjorn3

try-job: dist-various*
try-job: test-various*

rustbot · 2025-06-03T23:46:56Z

compiler-builtins is developed in its own repository. If possible, consider making this change to rust-lang/compiler-builtins instead.

cc @tgross35

tgross35 · 2025-06-03T23:48:52Z

It will most definitely work, in-tree compiler-builtins has no CI running and it is not yet used for anything :)

folkertdev · 2025-06-03T23:57:13Z

Me and my impatience...

Well, I'm happy to rebase this whenever to check whether things are working, and we'll see when everything is ready.

bors · 2025-06-05T20:47:23Z

☔ The latest upstream changes (presumably #142081) made this pull request unmergeable. Please resolve the merge conflicts.

tgross35 · 2025-06-05T23:45:19Z

#141993 will be the main relevant PR here, plus hopefully having some kind of testing in-tree.

@rustbot blocked

tgross35 · 2025-06-09T22:50:49Z

I'll kick off some jobs that should cover fortanix/sgx/uefi

@bors2 try
@bors2 delegate=try

rust-bors · 2025-06-09T22:50:53Z

⌛ Trying commit 601e479 with merge 98919d2…

To cancel the try build, run the command @bors2 try cancel.

rust-bors · 2025-06-09T22:50:53Z

@folkertdev can now perform try builds on this pull request

use `#[naked]` for `__rust_probestack` Let's see if this works now. Previously this change was in rust-lang/compiler-builtins#897, but we decided to wait until `compiler-builtins` was a subtree (and also `cfg(bootstrap)` is gone now). r? `@tgross35` cc `@bjorn3` try-job: `dist-various*` try-job: `test-various*`

tgross35 · 2025-06-09T22:52:52Z

library/compiler-builtins/compiler-builtins/src/probestack.rs

 // Our goal here is to touch each page between %rsp+8 and %rsp+8-%rax,
 // ensuring that if any pages are unmapped we'll make a page fault.
 //
+// This function is unsafe because it uses a custom ABI, it does not actually match `extern "C"`.


Mind making these FIXME(extern_c) since that should be a thing soon?

compiler/rustc_codegen_llvm/src/attributes.rs

rust-bors · 2025-06-10T00:23:34Z

☀️ Try build successful (CI)
Build commit: 98919d2 (98919d235b0bc249554b0ced4732020f6e247fe6)

tgross35

Lgtm, mind stuffing the last commit into the first?

tgross35 · 2025-06-10T05:15:45Z

@bors delegate+

bors · 2025-06-10T05:15:48Z

✌️ @folkertdev, you can now approve this pull request!

If @tgross35 told you to "r=me" after making some further change, please make that change, then do @bors r=@tgross35

folkertdev · 2025-06-10T09:58:15Z

@bors r=@tgross35

bors · 2025-06-10T09:58:17Z

📌 Commit b030442 has been approved by tgross35

It is now in the queue for this repository.

…on, r=tgross35 use `#[naked]` for `__rust_probestack` Let's see if this works now. Previously this change was in rust-lang/compiler-builtins#897, but we decided to wait until `compiler-builtins` was a subtree (and also `cfg(bootstrap)` is gone now). r? `@tgross35` cc `@bjorn3` try-job: `dist-various*` try-job: `test-various*`

Rollup of 14 pull requests Successful merges: - #134442 (Specify the behavior of `file!`) - #134841 (Look at proc-macro attributes when encountering unknown attribute) - #140372 (Exhaustively handle parsed attributes in CheckAttr) - #140766 (Stabilize keylocker) - #141642 (Note the version and PR of removed features when using it) - #141909 (Add central execution context to bootstrap) - #141992 (use `#[naked]` for `__rust_probestack`) - #142102 (docs: Small clarification on the usage of read_to_string and read_to_end trait methods) - #142124 (Allow transmute casts in pre-runtime-MIR) - #142240 (deduplicate the rest of AST walker functions) - #142258 (platform-support.md: Mention specific Linux kernel version or later) - #142262 (Mark `core::slice::memchr` as `#[doc(hidden)]`) - #142271 (compiler: fn ptrs should hit different lints based on ABI) - #142288 (const_eval: fix some outdated comments) r? `@ghost` `@rustbot` modify labels: rollup

Rollup of 16 pull requests Successful merges: - #134442 (Specify the behavior of `file!`) - #140372 (Exhaustively handle parsed attributes in CheckAttr) - #140766 (Stabilize keylocker) - #141642 (Note the version and PR of removed features when using it) - #141818 (Don't create .msi installer for gnullvm hosts) - #141909 (Add central execution context to bootstrap) - #141992 (use `#[naked]` for `__rust_probestack`) - #142101 (core::ptr: deduplicate more method docs) - #142102 (docs: Small clarification on the usage of read_to_string and read_to_end trait methods) - #142124 (Allow transmute casts in pre-runtime-MIR) - #142240 (deduplicate the rest of AST walker functions) - #142258 (platform-support.md: Mention specific Linux kernel version or later) - #142262 (Mark `core::slice::memchr` as `#[doc(hidden)]`) - #142271 (compiler: fn ptrs should hit different lints based on ABI) - #142275 (rustdoc: Refractor `clean_ty_generics`) - #142288 (const_eval: fix some outdated comments) r? `@ghost` `@rustbot` modify labels: rollup

Rollup merge of #141992 - folkertdev:probestack-naked-function, r=tgross35 use `#[naked]` for `__rust_probestack` Let's see if this works now. Previously this change was in rust-lang/compiler-builtins#897, but we decided to wait until `compiler-builtins` was a subtree (and also `cfg(bootstrap)` is gone now). r? ``@tgross35`` cc ``@bjorn3`` try-job: `dist-various*` try-job: `test-various*`

Rollup of 16 pull requests Successful merges: - rust-lang/rust#134442 (Specify the behavior of `file!`) - rust-lang/rust#140372 (Exhaustively handle parsed attributes in CheckAttr) - rust-lang/rust#140766 (Stabilize keylocker) - rust-lang/rust#141642 (Note the version and PR of removed features when using it) - rust-lang/rust#141818 (Don't create .msi installer for gnullvm hosts) - rust-lang/rust#141909 (Add central execution context to bootstrap) - rust-lang/rust#141992 (use `#[naked]` for `__rust_probestack`) - rust-lang/rust#142101 (core::ptr: deduplicate more method docs) - rust-lang/rust#142102 (docs: Small clarification on the usage of read_to_string and read_to_end trait methods) - rust-lang/rust#142124 (Allow transmute casts in pre-runtime-MIR) - rust-lang/rust#142240 (deduplicate the rest of AST walker functions) - rust-lang/rust#142258 (platform-support.md: Mention specific Linux kernel version or later) - rust-lang/rust#142262 (Mark `core::slice::memchr` as `#[doc(hidden)]`) - rust-lang/rust#142271 (compiler: fn ptrs should hit different lints based on ABI) - rust-lang/rust#142275 (rustdoc: Refractor `clean_ty_generics`) - rust-lang/rust#142288 (const_eval: fix some outdated comments) r? `@ghost` `@rustbot` modify labels: rollup

…on, r=tgross35 use `#[naked]` for `__rust_probestack` Let's see if this works now. Previously this change was in rust-lang/compiler-builtins#897, but we decided to wait until `compiler-builtins` was a subtree (and also `cfg(bootstrap)` is gone now). r? ``@tgross35`` cc ``@bjorn3`` try-job: `dist-various*` try-job: `test-various*`

rustbot assigned tgross35 Jun 3, 2025

folkertdev changed the title ~~Probestack naked function~~ use #[naked] for __rust_probestack Jun 3, 2025

folkertdev force-pushed the probestack-naked-function branch from be86dc8 to 79aa400 Compare June 5, 2025 21:34

rustbot added S-blocked Status: Blocked on something else such as an RFC or other implementation work. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Jun 5, 2025

folkertdev force-pushed the probestack-naked-function branch from 79aa400 to 6b6ad28 Compare June 9, 2025 21:29

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folkertdev force-pushed the probestack-naked-function branch from a2da8e0 to 601e479 Compare June 9, 2025 22:11

tgross35 added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-blocked Status: Blocked on something else such as an RFC or other implementation work. labels Jun 9, 2025

tgross35 reviewed Jun 9, 2025

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tgross35 approved these changes Jun 10, 2025

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folkertdev added 4 commits June 10, 2025 10:08

add a fixme to use extern_custom when available

f3af860

use #[naked] for __rust_probestack

b6eb4f9

merge the sgx/fortanix __rust_probestack into the general x86_64 one

45d649e

indent the probestack inline assembly

b030442

folkertdev force-pushed the probestack-naked-function branch from fff42eb to b030442 Compare June 10, 2025 08:13

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 Jun 10, 2025

fmease mentioned this pull request Jun 10, 2025

Rollup of 14 pull requests #142290

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fmease mentioned this pull request Jun 10, 2025

Rollup of 16 pull requests #142299

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bors merged commit a55b610 into rust-lang:master Jun 10, 2025
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rustbot added this to the 1.89.0 milestone Jun 10, 2025

folkertdev mentioned this pull request Jun 10, 2025

use #[naked] for __rust_probestack rust-lang/compiler-builtins#897

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jieyouxu mentioned this pull request Jun 17, 2025

wasmer relies on __rust_probestack #142612

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juntyr mentioned this pull request Jun 17, 2025

undefined symbol: __rust_probestack on nightly wasmerio/wasmer#5610

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folkertdev mentioned this pull request Jul 12, 2025

Regression: link fails with undefined reference to `__rust_probestack' #143835

Open

use #[naked] for __rust_probestack #141992

use #[naked] for __rust_probestack #141992

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use `#[naked]` for `__rust_probestack` #141992

use `#[naked]` for `__rust_probestack` #141992

folkertdev commented Jun 3, 2025 •

edited by tgross35

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