S/390: Make jmp_buf extendible.
S/390: Make ucontext_t extendible.
S/390: Get rid of unused variable warning in dl-machine.h
S/390: Remove __tls_get_addr argument cast.
[AArch64] Fix CFA adjustment on dynamic linker entry.
Fix integer overflow in vfwprintf. Fixes bug 14286.
[AArch64] Remove sqrt from libm-test-ulps
[AArch64] Fix FP_ROUNDMODE.

[BZ #16387] Fix FP_ROUNDMODE to extract the correct bits from FPCR.
Fix ldbl-128ibm coshl spurious overflows (bug 16407).

This patch fixes bug 16407, spurious overflows from ldbl-128ibm coshl.
The implementation assumed that a high part (reinterpreted as an
integer) of the absolute value of the argument of 0x408633ce8fb9f87dLL
or more meant overflow, but the actual threshold has high part
0x408633ce8fb9f87eLL (and a negative low part).  The patch adjusts the
threshold accordingly.

sinhl probably has the same issue, but I didn't get that far in adding
tests of special cases (such as just below and above overflow) before
the freeze and during the freeze is not a suitable time to add them
(as they'd require ulps to be regenerated again), so I'm not changing
that function for now; when I add more tests of special cases, we'll
discover whether sinhl indeed has this problem.

Tested powerpc32.

	* sysdeps/ieee754/ldbl-128ibm/e_coshl.c (__ieee754_coshl):
	Increase overflow threshold.
Mark more libm tests with xfail-rounding:ldbl-128ibm.

This patch marks more libm tests as expected to fail for ldbl-128ibm
in non-default rounding modes.  Given this, my expm1l fix
<https://sourceware.org/ml/libc-alpha/2014-01/msg00135.html> and my
libgcc fix <http://gcc.gnu.org/ml/gcc-patches/2014-01/msg00157.html>
for spurious overflows, the remaining failures in test-ldouble.out
(for powerpc32 hard float) are small ulps, spurious underflow and
inexact exceptions (the former probably arising from libgcc bugs
though I haven't checked each case; the latter are barely meaningful
for this format anyway when basic arithmetic isn't correctly rounding,
though most of them are probably GCC bug 59412 which doesn't actually
involve long double), missing underflow exceptions from clog, ctan and
ctanh (probably one of the known bugs for another function), and logb
in round-downward mode (bug 887, though it's really a GCC bug that
we're not currently working around).

Tested for powerpc32 hard float.

	* math/auto-libm-test-in: Mark various tests with
	xfail-rounding:ldbl-128ibm.
	* math/auto-libm-test-out: Regenerated.
Regenerate powerpc-nofpu ulps (again).
Use separate libc.abilist for MIPS o32 soft float.

Examining MIPS test results showed an ABI test failure that I must
have missed in 2.18 testing: hard-float and soft-float o32 no longer
have the same set of symbols (because of the __mips_fpu_getcw and
__mips_fpu_setcw functions, present for hard-float only, used by
fpu_control.h for hard-float MIPS16) and so need separate ABI test
baselines (they always were ABI-incompatible - the function-calling
interface is different - but previously had the same set of symbols
and versions so didn't need separate baselines).

Tested for hard-float and soft-float o32.

	* sysdeps/unix/sysv/linux/mips/mips32/nptl/libc.abilist: Move to
	....
	* sysdeps/unix/sysv/linux/mips/mips32/fpu/nptl/libc.abilist:
	... here.
	* sysdeps/unix/sysv/linux/mips/mips32/nofpu/nptl/libc.abilist: New
	file.