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Re: DLOPEN and Statically linked executable
- From: "Steve Munroe" <sjmunroe at us dot ibm dot com>
- To: Jakub Jelinek <jakub at redhat dot com>
- Cc: libc-alpha at sources dot redhat dot com, Peter Zaitsev <peter at mysql dot com>
- Date: Thu, 20 Jun 2002 13:23:11 -0500
- Subject: Re: DLOPEN and Statically linked executable
> Jakub Jelinek wrote:
> > Steve Munroe wrote:
> > I know that PowerPC (32-bit) currently only support fixed sized
(default)
> > thread stacks.
>
> Because it lacks a thread pointer register in its ABI. AFAIK Geoff
Keating
> wants to change this soon. IA-64, Sparc*, S390* etc. have one in their
ABIs,
> Alpha, IA-32 and X86-64 use magic (be it PAL call on alpha or %gs segment
> on the other two).
The PowerPC64 ABI does not seem to support the magic allowing thread stacks
to "float". The stack frames "back chain" field, would seem to make moving
a thread stack around (in virtual memory) impractical. But there should be
a better way to set/change the thread stack size on a process wide basis
(without resorting to pthread_attr_setstacksize).
> It would be good to reserve one from the beginning.
> The tp register is not only about ability to pthread_attr_setstacksize,
but
> also thread local storage implementation depends heavily on it.
The PowerPC64 ABI states that R13 is " Reserved for use as system Thread
ID".