[musl] SH sigcontext ABI is broken

[Rich Felker]

On Wed, Jun 24, 2015 at 07:37:45PM +0000, Joseph Myers wrote:
> On Wed, 24 Jun 2015, Rich Felker wrote:
> 
> > On Wed, Jun 24, 2015 at 02:10:06PM +0000, Joseph Myers wrote:
> > > On Wed, 24 Jun 2015, Rich Felker wrote:
> > > 
> > > > Nominally SH3 support remains in both the kernel and glibc. If it can
> > > > be established that multiple parties agree that there's really no one
> > > > left who cares about the old no-FPU sigcontext ABI on SH3, I will be
> > > > all for dropping it and unifying sigcontext.
> > > 
> > > Note that right now we have BE and LE versions of *three* ABIs for SH in 
> > > glibc (SH3 soft-float, SH4 soft-float, SH4 hard-float) (and as noted in 
> > > this discussion, right now each would only work properly on a kernel with 
> > > the corresponding configuration).  See 
> > > <https://sourceware.org/glibc/wiki/ABIList>.
> > 
> > Is your understanding that SH4 soft-float is using the SH4 ucontext_t
> > layout? I don't think it's even working at all. Glibc uses the layout
> 
> My understanding is what Kaz affirmed in 
> <https://sourceware.org/ml/libc-alpha/2014-01/msg00388.html>.  It's 
> entirely possible there are bugs (including regressions) in this area; if 
> so, they should be filed in Bugzilla.

OK, if that's the intent, I don't think it matches the present
reality. If I can confirm this I'll file a bug.

Rich