Messages in this thread | | | From | Florian Weimer <> | Subject | Re: [RFC PATCH 2/4] rseq: Allow extending struct rseq | Date | Wed, 15 Jul 2020 15:42:11 +0200 |
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* Mathieu Desnoyers:
> So indeed it could be done today without upgrading the toolchains by > writing custom assembler for each architecture to get the thread's > struct rseq. AFAIU the ABI to access the thread pointer is fixed for > each architecture, right ?
Yes, determining the thread pointer and access initial-exec TLS variables is baked into the ABI.
> How would this allow early-rseq-adopter libraries to interact with > glibc ?
Under all extension proposals I've seen so far, early adopters are essentially incompatible with glibc rseq registration. I don't think you can have it both ways.
Thanks, Florian
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