mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-12 06:10:10 +00:00
126 lines
2.9 KiB
C
126 lines
2.9 KiB
C
/* Low-level functions for atomic operations. Mips version.
|
|
Copyright (C) 2001, 2002 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 _MIPS_ATOMICITY_H
|
|
#define _MIPS_ATOMICITY_H 1
|
|
|
|
#include <sgidefs.h>
|
|
#include <inttypes.h>
|
|
|
|
#if (_MIPS_ISA >= _MIPS_ISA_MIPS2)
|
|
|
|
static inline int
|
|
__attribute__ ((unused))
|
|
exchange_and_add (volatile uint32_t *mem, int val)
|
|
{
|
|
int result, tmp;
|
|
|
|
__asm__ __volatile__
|
|
("/* Inline exchange & add */\n"
|
|
"1:\n\t"
|
|
"ll %0,%3\n\t"
|
|
"addu %1,%4,%0\n\t"
|
|
"sc %1,%2\n\t"
|
|
"beqz %1,1b\n\t"
|
|
"/* End exchange & add */"
|
|
: "=&r"(result), "=&r"(tmp), "=m"(*mem)
|
|
: "m" (*mem), "r"(val)
|
|
: "memory");
|
|
|
|
return result;
|
|
}
|
|
|
|
static inline void
|
|
__attribute__ ((unused))
|
|
atomic_add (volatile uint32_t *mem, int val)
|
|
{
|
|
int result;
|
|
|
|
__asm__ __volatile__
|
|
("/* Inline atomic add */\n"
|
|
"1:\n\t"
|
|
"ll %0,%2\n\t"
|
|
"addu %0,%3,%0\n\t"
|
|
"sc %0,%1\n\t"
|
|
"beqz %0,1b\n\t"
|
|
"/* End atomic add */"
|
|
: "=&r"(result), "=m"(*mem)
|
|
: "m" (*mem), "r"(val)
|
|
: "memory");
|
|
}
|
|
|
|
static inline int
|
|
__attribute__ ((unused))
|
|
compare_and_swap (volatile long int *p, long int oldval, long int newval)
|
|
{
|
|
long int ret, temp;
|
|
|
|
__asm__ __volatile__
|
|
("/* Inline compare & swap */\n"
|
|
"1:\n\t"
|
|
"ll %1,%5\n\t"
|
|
"move %0,$0\n\t"
|
|
"bne %1,%3,2f\n\t"
|
|
"move %0,%4\n\t"
|
|
"sc %0,%2\n\t"
|
|
"beqz %0,1b\n"
|
|
"2:\n\t"
|
|
"/* End compare & swap */"
|
|
: "=&r" (ret), "=&r" (temp), "=m" (*p)
|
|
: "r" (oldval), "r" (newval), "m" (*p)
|
|
: "memory");
|
|
|
|
return ret;
|
|
}
|
|
|
|
#else /* (_MIPS_ISA >= _MIPS_ISA_MIPS2) */
|
|
|
|
#warning MIPS I atomicity functions are not atomic
|
|
|
|
static inline int
|
|
__attribute__ ((unused))
|
|
exchange_and_add (volatile uint32_t *mem, int val)
|
|
{
|
|
int result = *mem;
|
|
*mem += val;
|
|
return result;
|
|
}
|
|
|
|
static inline void
|
|
__attribute__ ((unused))
|
|
atomic_add (volatile uint32_t *mem, int val)
|
|
{
|
|
*mem += val;
|
|
}
|
|
|
|
static inline int
|
|
__attribute__ ((unused))
|
|
compare_and_swap (volatile long int *p, long int oldval, long int newval)
|
|
{
|
|
if (*p != oldval)
|
|
return 0;
|
|
|
|
*p = newval;
|
|
return 1;
|
|
}
|
|
|
|
#endif /* !(_MIPS_ISA >= _MIPS_ISA_MIPS2) */
|
|
|
|
#endif /* atomicity.h */
|