Re: [PATCH glibc 5/9] glibc: Perform rseq(2) registration at C startup and thread creation (v17)

[Florian Weimer]

* Mathieu Desnoyers:

> ----- On Apr 28, 2020, at 8:33 AM, Mathieu Desnoyers mathieu.desnoyers@xxxxxxxxxxxx wrote:
>
>> ----- On Apr 28, 2020, at 8:02 AM, Florian Weimer fw@xxxxxxxxxxxxx wrote:
>> 
> [...]
>>> 
>>>> x32 should not be an issue as explained above, so I'm very open to
>>>> add this "uptr" for user-space only.
>>> 
>>> Okay, then please use anonymous unions and structs as necessary, to
>>> ensure that the uptr field can be reached on all platforms in the same
>>> way.
>> 
>> OK, will do!
>
> What I came up with looks like this. User-space can use rseq_cs.uptr.ptr
> both on 32-bit and 64-bit to update the pointer:

Agreed, this should work.