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Re: Using linker script to mark .debug_frame allocatable
On Wed, Jul 29, 2009 at 09:11:09AM -0700, David Daney wrote:
> DWARF based .eh_frame sections don't really have any architecture-specific
> things in them. The register numbering conventions are not needed when
> unwinding, only if you wanted to catch an exception and restore the
> registers, which I don't think you do in the kernel. I think the only
> architecture-specific code you would need is something to find the first CFA
> given the machine state at the unwind point.
Ah, OK then. In that case, -funwind-tables sounds exactly like what I
want. Thanks guys. The reason I got confused is because ARM has support
in the kernel for using the ARM unwind tables but the code looks
distinctly un-DWARF like. But as Daniel has already said, ARM is
> I would compile the whole thing with -fasynchronous-unwind-tables or
> -funwind-tables and use the resulting .eh_frame sections. That is what they
> are there for. Trying to make .debug_frame into an allocatable section
> seems hacky to me.
Yep, it definitely is a hack. Luckily now we have a better solution ;-)
> Good luck, it is something I have thought about doing myself.
Great, would you be wanting to look at MIPS support? There's a few
arch-specific parts that are needed. I'll CC you when I post the RFC
patch to lkml if you'd like?