S/390: Avoid relocations in .eh_frame section

[Jakub Jelinek]

On Tue, Nov 19, 2002 at 02:26:16PM -0800, Richard Henderson wrote:
> On Fri, Nov 15, 2002 at 11:32:34PM +0100, Ulrich Weigand wrote:
> > Is there some way of using an udata4 offset relative to .text
> > or something like that?  If not, I guess I'll have to use
> > sdata8 after all ...
> 
> Yes, if you've got the right relocation type.
> 
> This would be DW_EH_PE_udata4 | DW_EH_PE_textrel, with the
> base address registered with __register_frame_info_bases.
> 
> However, to my knowledge only ia64 has the segment-relative
> relocation needed so that the result is relative to the 
> _first_ .text section, instead of the .text section of the
> current object file.

Well, there is of course also the possibility to move the work
to the linker optimization, ie. start with DW_EH_PE_sdata8 | DW_EH_PE_pcrel
and if linker sees the shared library or binary is smaller than 2GB,
rewrite it into DW_EH_PE_sdata4 | DW_EH_PE_pcrel.
In fact this would be a IMO good idea for all 64-bit arches.

What I'm just wondering is the 4GB upper limit on shared libs,
does s390x have separate jump (resp. call) forward and backward?

	Jakub