mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-03 02:11:08 +00:00
103 lines
2.3 KiB
C
103 lines
2.3 KiB
C
/* Low-level functions for atomic operations. Alpha 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)
|
|
{
|
|
register int result, tmp;
|
|
|
|
__asm__ __volatile__ (
|
|
"/* Inline exchange & add */\n"
|
|
"1:\t"
|
|
"ldl_l %0,%3\n\t"
|
|
"addl %0,%4,%1\n\t"
|
|
"stl_c %1,%2\n\t"
|
|
"beq %1,2f\n"
|
|
".subsection 1\n"
|
|
"2:\t"
|
|
"br 1b\n"
|
|
".previous\n\t"
|
|
"mb\n\t"
|
|
"/* End exchange & add */"
|
|
: "=&r"(result), "=&r"(tmp), "=m"(*mem)
|
|
: "m" (*mem), "r"(val));
|
|
|
|
return result;
|
|
}
|
|
|
|
static inline void
|
|
__attribute__ ((unused))
|
|
atomic_add (volatile uint32_t *mem, int val)
|
|
{
|
|
register int result;
|
|
|
|
__asm__ __volatile__ (
|
|
"/* Inline exchange & add */\n"
|
|
"1:\t"
|
|
"ldl_l %0,%2\n\t"
|
|
"addl %0,%3,%0\n\t"
|
|
"stl_c %0,%1\n\t"
|
|
"beq %0,2f\n\t"
|
|
".subsection 1\n"
|
|
"2:\t"
|
|
"br 1b\n"
|
|
".previous\n\t"
|
|
"mb\n\t"
|
|
"/* End exchange & add */"
|
|
: "=&r"(result), "=m"(*mem)
|
|
: "m" (*mem), "r"(val));
|
|
}
|
|
|
|
static inline long
|
|
__attribute__ ((unused))
|
|
compare_and_swap (volatile long int *p, long int oldval, long int newval)
|
|
{
|
|
long int ret;
|
|
|
|
__asm__ __volatile__ (
|
|
"/* Inline compare & swap */\n"
|
|
"1:\t"
|
|
"ldq_l %0,%4\n\t"
|
|
"cmpeq %0,%2,%0\n\t"
|
|
"beq %0,3f\n\t"
|
|
"mov %3,%0\n\t"
|
|
"stq_c %0,%1\n\t"
|
|
"beq %0,2f\n\t"
|
|
".subsection 1\n"
|
|
"2:\t"
|
|
"br 1b\n"
|
|
".previous\n\t"
|
|
"3:\t"
|
|
"mb\n\t"
|
|
"/* End compare & swap */"
|
|
: "=&r"(ret), "=m"(*p)
|
|
: "r"(oldval), "r"(newval), "m"(*p));
|
|
|
|
return ret;
|
|
}
|
|
|
|
#endif /* atomicity.h */
|