Re: Re: [0pf] musl/SH-FDPIC progress

[Rich Felker <dalias@libc.org>]

On Fri, Sep 11, 2015 at 03:05:22PM -0400, Rich Felker wrote:
> On Thu, Sep 10, 2015 at 09:48:50PM -0400, Rich Felker wrote:
> > I now have a working prototype of static-linked FDPIC binary support
> > in musl libc using gcc 5.2 (with the forward-ported SH-FDPIC patch)
> > and binutils 2.25.1. I've tested simple example programs and some
> > non-trivial examples with threads and they work both under qemu-sh4eb
> > with FDPIC support added (needs a small patch) and on real J2
> > hardware, where they successfully share text/execute-in-place.
> > 
> > The gcc patch is presently against gcc with all the other patches from
> > my musl-cross-make repo applied, so some refactoring will be needed to
> > propose it upstream, but I think it's ready for initial review. After
> > a little bit more cleanup (mainly bad specs logic) I'll go ahead and
> > put a version of this patch in the toolchain repo.
> 
> I've posted the current version of my patches in my toolchain repo:
> 
> https://github.com/richfelker/musl-cross-make/commit/3a0c9775b69ae311d89b6a9df6788d43f206cf6c
> 
> As noted in the commit message, a patch on the musl side is needed to
> get actual working binaries. I'll post a version of this (not
> appropriate for upstream) soon.

Actually I just went ahead and got the static-linking-only part
suitable for upstream and committed it. As of this commit to musl:

http://git.musl-libc.org/cgit/musl/commit/?id=d4c82d05b8d0ee97f6356d60986799a95ed5bd74

it should be possible to get a working fdpic build. Note that PIE is
not supported yet and my toolchain build has a GCC patch to always
force -pie. So patches/gcc-5.2.0/0006-defaultpie.diff needs to be
removed before starting to get a working fdpic toolchain right now.

Rich