Thumb 2
Ensure proper support for Thumb 2 in the kernel and ship Thumb 2 kernels
Ensure that the kernel compiles with Thumb 2 support (support should be there, but not yet thoroughly tested in kernel)
NO SESSION REQUIRED
Blueprint information
- Status:
- Complete
- Approver:
- Paul McKenney
- Priority:
- Medium
- Drafter:
- Loïc Minier
- Direction:
- Approved
- Assignee:
- Nicolas Pitre
- Definition:
- Approved
- Series goal:
- Accepted for 11.05
- Implementation:
-
Implemented
- Milestone target:
- None
- Started by
- Mounir Bsaibes
- Completed by
- Mounir Bsaibes
Whiteboard
Specification shared with https:/
Rejected: Fix Thumb-2 hardware single step debug emulation in the kernel (for reliable userspace single step in the presence of signals (not currently used; also the existing ARM implementation didn't fully work and has been removed from the kernel in the meantime).
Everything is done except for integrating the memcpy routines (which
was deprioritised) and handling userspace backtraces from the kernel
(which we effectively rejected as infeasible). The Postponed items will not be handled.
dave-martin-arm] Fix kprobes to work with Thumb 2 (DT victim, Tixy helping for 1111): POSTPONE
Work with toolchain group to ensure that the kernel can find user-space unwind tables (Linus/
Integrate optimized non-NEON memcpy routines from toolchain group (no performance improvement, so not pulled in): POSTPONE
Work Items
Work items:
[dave-martin-arm] Fix ftrace and dynamic trace to work together on Thumb 2 (no action required): DONE
[dave-martin-arm] Fix SMP on UP to handle Thumb 2: DONE
[aneesh] Build uboot in Thumb 2 mode as experimental effort: DONE
Fix kernel handling of backtraces for Thumb 2 kernel code: DONE
Correctly handle kernel dumping of user-space backtraces: DONE
Dependency tree
* Blueprints in grey have been implemented.
