Landing: 4ef64ad1aa9b

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Project / Subsystem

gcc / microblaze

Date

2026-06-02

Author

Ramin Moussavi

Commit

4ef64ad1aa9bbbe9471610e2de6ef0c8afed8b1f

Source

github

Perf win

No

Breaking

No

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All attributes

project: gcc
subsystem: microblaze
patch_id: —
commit_hash: 4ef64ad1aa9bbbe9471610e2de6ef0c8afed8b1f
source_type: github
headline: MicroBlaze adds Linux signal frame unwinding support
tldr: GCC's libgcc for MicroBlaze Linux now supports DWARF unwinding through signal frames, enabling correct stack traces andpthread cancellation.
author: Ramin Moussavi
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • microblaze
• linux
• libgcc
• debugging
• nptl
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/4ef64ad1aa9bbbe9471610e2de6ef0c8afed8b1f
date: 2026-06-02T00:00:00.000Z

GCC’s libgcc for MicroBlaze Linux now properly supports DWARF unwinding through signal handler frames. Previously, applications using asynchronous pthread cancellation (like NPTL) or similar signal mechanisms would fail to unwind correctly past a signal, resulting in incomplete stack traces, incorrect cleanup handlers, or crashes. This fix introduces code to recognize the kernel’s signal trampoline and reconstructs the stack state from the pt_regs within the sigcontext, ensuring that unwinding operations can correctly traverse signal frames.