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Skeleton documentation for the RISC-V port

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During the upstreaming process it was suggested that I add a handful of
small documentation entries about the RISC-V port, which I've collected
here.

2018-01-29  Palmer Dabbelt  <palmer@sifive.com>

        * manual/math.texi: RISC-V supports _Float128 and _Float64x.
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Palmer Dabbelt 2017-12-26 20:55:44 -08:00
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1
ChangeLog
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@ -2,6 +2,7 @@
* sysdeps/init_array/crti.S (.section .init_array): Add
PREINIT_FUNCTION when defined.
* manual/math.texi: RISC-V supports _Float128 and _Float64x.
2018-01-29 Florian Weimer <fweimer@redhat.com>

16
NEWS
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@ -41,13 +41,13 @@ Major new features:
process aborts as the result of assertion failures.
* On platforms where long double has the IEEE binary128 format (aarch64,
alpha, mips64, s390 and sparc), the math library now implements _Float128
interfaces for that type, as defined by ISO/IEC TS 18661-3:2015. These
are the same interfaces added in version 2.26 for some platforms where
alpha, mips64, riscv, s390 and sparc), the math library now implements
_Float128 interfaces for that type, as defined by ISO/IEC TS 18661-3:2015.
These are the same interfaces added in version 2.26 for some platforms where
this format is supported but is not the format of long double.
* On platforms with support for _Float64x (aarch64, alpha, i386, ia64,
mips64, powerpc64le, s390, sparc and x86_64), the math library now
mips64, powerpc64le, riscv, s390, sparc and x86_64), the math library now
implements interfaces for that type, as defined by ISO/IEC TS
18661-3:2015. These are corresponding interfaces to those supported for
_Float128.
@ -98,6 +98,14 @@ Major new features:
to fail to load locales and fall back to the builtin C/POSIX locales.
See notes below for other changes affecting compatibility.
* Support for the RISC-V ISA running on Linux has been added. This port
requires at least binutils-2.30, gcc-7.3.0, and linux-4.15; and is supported
for the following ISA and ABI pairs:
- rv64imac lp64
- rv64imafdc lp64
- rv64imafdc lp64d
Deprecated and removed features, and other changes affecting compatibility:
* Statically compiled applications attempting to load locales compiled for the

1
README
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@ -39,6 +39,7 @@ The GNU C Library supports these configurations for using Linux kernels:
powerpc64*-*-linux-gnu Big-endian and little-endian.
s390-*-linux-gnu
s390x-*-linux-gnu
riscv64-*-linux-gnu
sh[34]-*-linux-gnu
sparc*-*-linux-gnu
sparc64*-*-linux-gnu

2
manual/math.texi
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@ -70,7 +70,7 @@ provided for @code{_Float32}, @code{_Float64} and @code{_Float32x} on
all platforms.
It is also provided for @code{_Float128} and @code{_Float64x} on
powerpc64le (PowerPC 64-bits little-endian), x86_64, x86, ia64,
aarch64, alpha, mips64, s390 and sparc.
aarch64, alpha, mips64, riscv, s390 and sparc.
@menu
* Mathematical Constants:: Precise numeric values for often-used