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

* Mathieu Desnoyers:

----- On Apr 28, 2020, at 8:33 AM, Mathieu Desnoyers mathieu.desnoyers@efficios.com wrote:

quoted

----- On Apr 28, 2020, at 8:02 AM, Florian Weimer fw@deneb.enyo.de wrote:

[...]

quoted

quoted

quoted

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.