On Thu, 12 Mar 2020, Vineet Gupta via Libc-alpha wrote:
> diff --git a/sysdeps/arc/bits/endianness.h b/sysdeps/arc/bits/endianness.h
> new file mode 100644
> index 000000000000..8f17ca84b485
> --- /dev/null
> +++ b/sysdeps/arc/bits/endianness.h
> @@ -0,0 +1,15 @@
> +#ifndef _BITS_ENDIANNESS_H
> +#define _BITS_ENDIANNESS_H 1
> +
> +#ifndef _BITS_ENDIAN_H
> +# error "Never use <bits/endian.h> directly; include <endian.h> instead."
> +#endif
> +
> +/* ARC has selectable endianness. */
> +#ifdef __BIG_ENDIAN__
> +# define __BYTE_ORDER __BIG_ENDIAN
> +#else
> +# define __BYTE_ORDER __LITTLE_ENDIAN
> +#endif
Elsewhere you say the port is little-endian only. In such cases we
generally have an error somewhere if you attempt to build glibc for the
other endianness, to avoid an other-endian configuration accidentally
building but not working and having a broken ABI. For example, see what
Nios II does: sysdeps/nios2/bits/endianness.h handles both endiannesses,
but sysdeps/nios2/configure.ac produces an error for big-endian.
> +/* PLT jump into resolver passes PC of PLTn, while _dl_fixup expects the
> + address of corresponding .rela.plt entry. */
> +
> +#ifdef __A7__
> +# define ARC_PLT_SIZE 12
> +#else
> +# define ARC_PLT_SIZE 16
> +#endif
Is this some sort of ABI difference between two incompatible ABIs? (The
ABI document you pointed to only seems to mention 12-byte PLT entries.)
> +#define reloc_index \
> +({ \
> + unsigned long int plt0 = D_PTR (l, l_info[DT_PLTGOT]); \
> + unsigned long int pltn = reloc_arg; \
> + /* Exclude PL0 and PLT1. */ \
Should PL0 be PLT0 here?
> + unsigned long int idx = (pltn - plt0)/ARC_PLT_SIZE - 2; \
Missing spaces around '/'.
> diff --git a/sysdeps/arc/gmp-mparam.h b/sysdeps/arc/gmp-mparam.h
> new file mode 100644
> index 000000000000..5580551483c8
> --- /dev/null
> +++ b/sysdeps/arc/gmp-mparam.h
> @@ -0,0 +1,23 @@
> +/* gmp-mparam.h -- Compiler/machine parameter header file.
> +
> +Copyright (C) 2017-2020 Free Software Foundation, Inc.
> +
> +This file is part of the GNU MP Library.
> +
> +The GNU MP Library is free software; you can redistribute it and/or modify
> +it under the terms of the GNU Lesser General Public License as published by
> +the Free Software Foundation; either version 2.1 of the License, or (at your
> +option) any later version.
> +
> +The GNU MP Library is distributed in the hope that it will be useful, but
> +WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
> +or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
> +License for more details.
> +
> +You should have received a copy of the GNU Lesser General Public License
> +along with the GNU MP Library; see the file COPYING.LIB. If not, see
> +<https://www.gnu.org/licenses/>. */
> +
> +#include <sysdeps/generic/gmp-mparam.h>
> +
> +#define IEEE_DOUBLE_BIG_ENDIAN 0
Plenty of architectures that have, or support, little-endian floating
point do not have gmp-mparam.h at all. IEEE_DOUBLE_BIG_ENDIAN is only
used to define union ieee_double_extract, which is nowhere used in glibc.
So I don't think you need this header at all (and it shows up the scope
for a more general cleanup possible for other ports, I suspect only the
x32 and mips64 versions of this header, the ones that define
_LONG_LONG_LIMB for ILP32 configurations with 64-bit registers, are the
only non-generic ones that do anything useful - but you don't need to do
that cleanup).
--
Joseph S. Myers
joseph@xxxxxxxxxxxxxxxx
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