8324123: aarch64: fix prfm literal encoding in assembler

[mmyxym]

Clean backport of fix of aarch64 PRFM (literal) encoding.

Additional testing:

• Linux aarch64 server fastdebug, tier1

---

Progress

• JDK-8324123 needs maintainer approval
• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Issue

• JDK-8324123: aarch64: fix prfm literal encoding in assembler (Bug - P4 - Approved)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk21u-dev.git pull/299/head:pull/299
$ git checkout pull/299

Update a local copy of the PR:
$ git checkout pull/299
$ git pull https://git.openjdk.org/jdk21u-dev.git pull/299/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 299

View PR using the GUI difftool:
$ git pr show -t 299

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk21u-dev/pull/299.diff

Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back lmao! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

This backport pull request has now been updated with issue from the original commit.

[openjdk]

⚠️ @mmyxym This change is now ready for you to apply for maintainer approval. This can be done directly in each associated issue or by using the /approval command.

[mlbridge]

Webrevs

• 00: Full (ddb61dae)

[mmyxym]

/approval request Clean backport of fix of aarch64 PRFM (literal) encoding. Risk is very low since the encoding is not used yet in code base.

[openjdk]

@mmyxym
8324123: The approval request has been created successfully.

[GoeLin]

@mmyxym GHA Tests are failing.

[mmyxym]

@mmyxym GHA Tests are failing.

@GoeLin , it's a riscv64 build failure not related to compilation(the commit only changes aarch64):
"Extracting libpam0t64...
E: Tried to extract package, but file already exists. Exit...
Error: Process completed with exit code 1."
Looks like a GHA infra issue.

[openjdk]

@mmyxym This change now passes all automated pre-integration checks.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

After integration, the commit message for the final commit will be:

8324123: aarch64: fix prfm literal encoding in assembler

You can use pull request commands such as /summary, /contributor and /issue to adjust it as needed.

At the time when this comment was updated there had been 3 new commits pushed to the master branch:

• 76ebcc1: 8322846: Running with -Djdk.tracePinnedThreads set can hang
• 2d791b8: 8323170: j2dbench is using outdated javac source/target to be able to build by itself
• 3eb5517: 8315373: Change VirtualThread to unmount after freezing, re-mount before thawing

Please see this link for an up-to-date comparison between the source branch of this pull request and the master branch.
As there are no conflicts, your changes will automatically be rebased on top of these commits when integrating. If you prefer to avoid this automatic rebasing, please check the documentation for the /integrate command for further details.

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➡️ To flag this PR as ready for integration with the above commit message, type /integrate in a new comment. (Afterwards, your sponsor types /sponsor in a new comment to perform the integration).

[mmyxym]

/integrate

[openjdk]

@mmyxym
Your change (at version ddb61da) is now ready to be sponsored by a Committer.

[mmyxym]

Could committers please help sponsor, thanks!

[phohensee]

/sponsor

[openjdk]

Going to push as commit e667521.
Since your change was applied there have been 3 commits pushed to the master branch:

• 76ebcc1: 8322846: Running with -Djdk.tracePinnedThreads set can hang
• 2d791b8: 8323170: j2dbench is using outdated javac source/target to be able to build by itself
• 3eb5517: 8315373: Change VirtualThread to unmount after freezing, re-mount before thawing

Your commit was automatically rebased without conflicts.

[openjdk]

@phohensee @mmyxym Pushed as commit e667521.

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