[llvm-dev] [lld][ELF] Add option to make .dynamic read only

[Petr Hosek via llvm-dev]

On Tue, May 23, 2017 at 3:19 PM Rafael Avila de Espindola <
rafael.espindola at gmail.com> wrote:

> Petr Hosek via llvm-dev <llvm-dev at lists.llvm.org> writes:
> > One of the design principles we're trying to follow is to make everything
> > read-only, unless it has be writable. The only reason for .dynamic to be
> > writable is DT_DEBUG which is something we never intend to support. FWIW
> in
> > Fuchsia all we need is a read-only .dynamic without emitting DT_DEBUG
> > altogether, but we wanted to make sure that this flag is also usable
> > elsewhere hence implementing DT_DEBUG_INDIRECT which is already supported
> > by musl as Jake pointed out.
>
> It might be easier to have an option for making .dynamic be read only
> and the logic for emitting DT_DEBUG becomes ".dynamic is rw or mips".
>
> BTW, dynamic linkers really never relocate the .d_ptr entries?
>

musl's dynamic linker doesn't and neither ours. Older versions of glibc's
dynamic linker do, but I'm not sure about the newer ones.


> What are you guys using instead of DT_DEBUG?
>

We use other OS-specific runtime means to register that address.


> Cheers,
> Rafael
>
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