mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-17 18:40:14 +00:00
41bdb6e20c
2001-07-06 Paul Eggert <eggert@twinsun.com> * manual/argp.texi: Remove ignored LGPL copyright notice; it's not appropriate for documentation anyway. * manual/libc-texinfo.sh: "Library General Public License" -> "Lesser General Public License". 2001-07-06 Andreas Jaeger <aj@suse.de> * All files under GPL/LGPL version 2: Place under LGPL version 2.1.
88 lines
2.2 KiB
C
88 lines
2.2 KiB
C
/* Low-level functions for atomic operations. ARM version.
|
|
Copyright (C) 1997, 1998, 1999, 2000 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, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
#ifndef _ATOMICITY_H
|
|
#define _ATOMICITY_H 1
|
|
|
|
#include <inttypes.h>
|
|
|
|
|
|
static inline int
|
|
__attribute__ ((unused))
|
|
exchange_and_add (volatile uint32_t *mem, int val)
|
|
{
|
|
int tmp1;
|
|
int tmp2;
|
|
int result;
|
|
__asm__ ("\n"
|
|
"0:\tldr\t%0,[%3]\n\t"
|
|
"add\t%1,%0,%4\n\t"
|
|
"swp\t%2,%1,[%3]\n\t"
|
|
"cmp\t%0,%2\n\t"
|
|
"swpne\t%1,%2,[%3]\n\t"
|
|
"bne\t0b"
|
|
: "=&r" (result), "=&r" (tmp1), "=&r" (tmp2)
|
|
: "r" (mem), "r"(val)
|
|
: "cc", "memory");
|
|
return result;
|
|
}
|
|
|
|
static inline void
|
|
__attribute__ ((unused))
|
|
atomic_add (volatile uint32_t *mem, int val)
|
|
{
|
|
int tmp1;
|
|
int tmp2;
|
|
int tmp3;
|
|
__asm__ ("\n"
|
|
"0:\tldr\t%0,[%3]\n\t"
|
|
"add\t%1,%0,%4\n\t"
|
|
"swp\t%2,%1,[%3]\n\t"
|
|
"cmp\t%0,%2\n\t"
|
|
"swpne\t%1,%2,[%3]\n\t"
|
|
"bne\t0b"
|
|
: "=&r" (tmp1), "=&r" (tmp2), "=&r" (tmp3)
|
|
: "r" (mem), "r"(val)
|
|
: "cc", "memory");
|
|
}
|
|
|
|
static inline int
|
|
__attribute__ ((unused))
|
|
compare_and_swap (volatile long int *p, long int oldval, long int newval)
|
|
{
|
|
int result, tmp;
|
|
__asm__ ("\n"
|
|
"0:\tldr\t%1,[%2]\n\t"
|
|
"mov\t%0,#0\n\t"
|
|
"cmp\t%1,%4\n\t"
|
|
"bne\t1f\n\t"
|
|
"swp\t%0,%3,[%2]\n\t"
|
|
"cmp\t%1,%0\n\t"
|
|
"swpne\t%1,%0,[%2]\n\t"
|
|
"bne\t0b\n\t"
|
|
"mov\t%0,#1\n"
|
|
"1:"
|
|
: "=&r" (result), "=&r" (tmp)
|
|
: "r" (p), "r" (newval), "r" (oldval)
|
|
: "cc", "memory");
|
|
return result;
|
|
}
|
|
|
|
#endif /* atomicity.h */
|