mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-15 04:20:28 +08:00
04277e02d7
* All files with FSF copyright notices: Update copyright dates using scripts/update-copyrights. * locale/programs/charmap-kw.h: Regenerated. * locale/programs/locfile-kw.h: Likewise.
60 lines
2.5 KiB
C
60 lines
2.5 KiB
C
/* Macros to test for CPU features on ARM. Generic ARM version.
|
|
Copyright (C) 2012-2019 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C 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 C 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 C Library. If not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#ifndef _ARM_ARM_FEATURES_H
|
|
#define _ARM_ARM_FEATURES_H 1
|
|
|
|
/* An OS-specific arm-features.h file should define ARM_HAVE_VFP to
|
|
an appropriate expression for testing at runtime whether the VFP
|
|
hardware is present. We'll then redefine it to a constant if we
|
|
know at compile time that we can assume VFP. */
|
|
|
|
#ifndef __SOFTFP__
|
|
/* The compiler is generating VFP instructions, so we're already
|
|
assuming the hardware exists. */
|
|
# undef ARM_HAVE_VFP
|
|
# define ARM_HAVE_VFP 1
|
|
#endif
|
|
|
|
/* An OS-specific arm-features.h file may define ARM_ASSUME_NO_IWMMXT
|
|
to indicate at compile time that iWMMXt hardware is never present
|
|
at runtime (or that we never care about its state) and so need not
|
|
be checked for. */
|
|
|
|
/* A more-specific arm-features.h file may define ARM_ALWAYS_BX to indicate
|
|
that instructions using pc as a destination register must never be used,
|
|
so a "bx" (or "blx") instruction is always required. */
|
|
|
|
/* The log2 of the minimum alignment required for an address that
|
|
is the target of a computed branch (i.e. a "bx" instruction).
|
|
A more-specific arm-features.h file may define this to set a more
|
|
stringent requirement.
|
|
|
|
Using this only makes sense for code in ARM mode (where instructions
|
|
always have a fixed size of four bytes), or for Thumb-mode code that is
|
|
specifically aligning all the related branch targets to match (since
|
|
Thumb instructions might be either two or four bytes). */
|
|
#ifndef ARM_BX_ALIGN_LOG2
|
|
# define ARM_BX_ALIGN_LOG2 2
|
|
#endif
|
|
|
|
/* An OS-specific arm-features.h file may define ARM_NO_INDEX_REGISTER to
|
|
indicate that the two-register addressing modes must never be used. */
|
|
|
|
#endif /* arm-features.h */
|