mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-06 05:10:05 +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.
83 lines
2.3 KiB
C
83 lines
2.3 KiB
C
/* Low-level functions for atomic operations. Sparc64 version.
|
|
Copyright (C) 1999 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)
|
|
{
|
|
uint32_t tmp1, tmp2;
|
|
|
|
__asm__ __volatile__("1: lduw [%2], %0\n\t"
|
|
" add %0, %3, %1\n\t"
|
|
" cas [%2], %0, %1\n\t"
|
|
" sub %0, %1, %0\n\t"
|
|
" brnz,pn %0, 1b\n\t"
|
|
" nop"
|
|
: "=&r" (tmp1), "=&r" (tmp2)
|
|
: "r" (mem), "r" (val)
|
|
: "memory");
|
|
return tmp2;
|
|
}
|
|
|
|
static inline void
|
|
__attribute__ ((unused))
|
|
atomic_add (volatile uint32_t *mem, int val)
|
|
{
|
|
uint32_t tmp1, tmp2;
|
|
|
|
__asm__ __volatile__("1: lduw [%2], %0\n\t"
|
|
" add %0, %3, %1\n\t"
|
|
" cas [%2], %0, %1\n\t"
|
|
" sub %0, %1, %0\n\t"
|
|
" brnz,pn %0, 1b\n\t"
|
|
" nop"
|
|
: "=&r" (tmp1), "=&r" (tmp2)
|
|
: "r" (mem), "r" (val)
|
|
: "memory");
|
|
}
|
|
|
|
static inline int
|
|
__attribute__ ((unused))
|
|
compare_and_swap (volatile long int *p, long int oldval, long int newval)
|
|
{
|
|
register long int tmp, tmp2;
|
|
|
|
__asm__ __volatile__("1: ldx [%4], %0\n\t"
|
|
" mov %2, %1\n\t"
|
|
" cmp %0, %3\n\t"
|
|
" bne,a,pn %%xcc, 2f\n\t"
|
|
" mov 0, %0\n\t"
|
|
" casx [%4], %0, %1\n\t"
|
|
" sub %0, %1, %0\n\t"
|
|
" brnz,pn %0, 1b\n\t"
|
|
" mov 1, %0\n\t"
|
|
"2:"
|
|
: "=&r" (tmp), "=&r" (tmp2)
|
|
: "r" (newval), "r" (oldval), "r" (p)
|
|
: "memory");
|
|
return tmp;
|
|
}
|
|
|
|
#endif /* atomicity.h */
|