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Update FEAT_PAuth_LR behaviour for AArch64 #90614

Merged
merged 4 commits into from
May 10, 2024
Merged

Update FEAT_PAuth_LR behaviour for AArch64 #90614

merged 4 commits into from
May 10, 2024

Commits on May 9, 2024

  1. [NFC] Add Extension Lookup to AArch64TargetParser 

    Currently, an extension cannot be found using the ExtID. To address this,
the function `lookupExtensionByID` has been added to the `ExtensionSet`
Class so it can be targeted from outside the function.

This will allow for the Extensions Information to be searched for and
stored externally to the ExtensionSet Class. This enables being able to
search for if Architecture Features have been enabled by the user in the
command line.
    @Stylie777
    Stylie777 committed May 9, 2024
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  2. [AArch64] Enable PAuthLR by default for standard 

     branch protection when the feature is available

Currently, LLVM implements the `standard` option as `bti+pac-ret`
for ARM and AArch64. Following discussions with the GNU
developemnt team within Arm it was decided to align the
behaviour of `standard` to match across the different compilers.

To ensure the behaviour is aligned. LLVM has been updated to
implement `standard` as `bti+pac-ret+pc` by default when
`+pauth-lr` is passed as part of the `-march` argument.
    @Stylie777
    Stylie777 committed May 9, 2024
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  3. [NFC] Fix formatting for release notes 

    This was causing a build failure due to using the incorrect syntax
for quoting.
    @Stylie777
    Stylie777 committed May 9, 2024
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  4. !fixup [AArch64]

    @Stylie777
    Stylie777 committed May 9, 2024
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