RFC: Unwind info for PLT

[Joseph S. Myers]

On Fri, 10 Jun 2011, Jakub Jelinek wrote:

> Anyway, I think hardcoding this in the linker would be problematic,
> we couldn't tweak it, so providing some special hidden symbols around
> the .plt section and let glibc crtfiles provide it sounds like the best
> option to me.

I think that when the linker generates code it should generate unwind info 
for it to allow accurate backtraces from any instruction (both .eh_frame 
and .debug_frame, or target-specific forms on some targets).  The details 
of this generated code may not be part of the ABI on all targets, may vary 
depending on the linker version and may be a lot more complicated than a 
single PLT section - there are lots of purposes for which the linker may 
generate code.  I don't think glibc crtfiles are a good place for it.

-- 
Joseph S. Myers
joseph@codesourcery.com