Skip to content

BASEPRI needs an ISB #702

Closed
Closed
BASEPRI needs an ISB#702

Description

@thejpster
thejpster
opened on Oct 19, 2026

https://support.arm.com/documentation/107706/0100/Exceptions-and-interrupts-overview/Special-registers-for-exception-masking/BASEPRI

Changing BASEPRI should have an ISB after it to ensure it has taken affect by the time the next instruction runs (which could be a load or store that is relying on certain interrupts being masked off).

Activity

  1. thejpster commented on Oct 19, 2026

    @thejpster
    thejpster
    on Oct 19, 2026
    ContributorAuthor

    https://support.arm.com/documentation/107706/0100/Exceptions-and-interrupts-overview/Special-registers-for-exception-masking/PRIMASK

    PRIMASK and FAULTMASK also need an ISB

  2. adamgreig
    added a commit that references this issue on Oct 21, 2026

    Add ISB after writes to PRIMASK and BASEPRI. Closes #702.

    a8e5a2e
  3. adamgreig
    closed this as completedon Oct 25, 2026

  4. adamgreig commented on Oct 25, 2026

    @adamgreig
    adamgreig
    on Oct 25, 2026
    Member

    Sorry, this was done by #703 but GitHub failed to close the issue.

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment

Metadata

Metadata

Assignees

No one assigned

    Labels

    No labels
    No labels

    Type

    No type

    Projects

    No projects

      Milestone

      No milestone

      Relationships

      None yet

      Development

      No branches or pull requests

      Issue actions