[PATCH v3 0/3] sframe: Represent .cfi_undefined RA

[Jens Remus]

On 23.07.2025 15:17, Jens Remus wrote:

> Stack tracer implementations using SFrame, such as Glibc backtrace(),
> benefit from the ability to detect whether an outermost frame has been
> reached, which indicates that the trace is complete.  In DWARF CFI this
> is indicated by an "undefined" register rule for the return address
> register.
> 
> This would enable to implement s390 64-bit (s390x) support for
> backtracing using SFrame in Glibc [1], which requires the stack tracer
> implementation to reliably detect, that an outermost frame has been
> reached.

> I'll send a RFC V3 of my related Glibc patch series [1] next.
> 
> [1]: [RFC PATCH v2 0/2] s390x: Add support for SFrame stack backtracing,
>      https://inbox.sourceware.org/libc-alpha/20250627133813.2198784-1-jremus@linux.ibm.com/

I posted the new version of my related Glibc patch series as
"[RFC PATCH v3 0/3] s390x: Add support for SFrame stack backtracing":
https://inbox.sourceware.org/libc-alpha/20250723142347.2159793-1-jremus@linux.ibm.com/

Regards,
Jens
-- 
Jens Remus
Linux on Z Development (D3303)
+49-7031-16-1128 Office
jremus@de.ibm.com

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