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Diffstat (limited to 'sysdeps/powerpc/powerpc64/atomicity.h')
| -rw-r--r-- | sysdeps/powerpc/powerpc64/atomicity.h | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/sysdeps/powerpc/powerpc64/atomicity.h b/sysdeps/powerpc/powerpc64/atomicity.h new file mode 100644 index 0000000000..b9d0de0ac5 --- /dev/null +++ b/sysdeps/powerpc/powerpc64/atomicity.h @@ -0,0 +1,132 @@ +/* Low-level functions for atomic operations. PowerPC64 version. + Copyright (C) 1997, 1998, 1999, 2000, 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 Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. 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> + +#if BROKEN_PPC_ASM_CR0 +# define __ATOMICITY_INLINE /* nothing */ +#else +# define __ATOMICITY_INLINE inline +#endif + +static __ATOMICITY_INLINE int +__attribute__ ((unused)) +exchange_and_add (volatile uint32_t *mem, int val) +{ + int tmp, result; + __asm__ ("\n\ +0: lwarx %0,0,%2 \n\ + add%I3 %1,%0,%3 \n\ + stwcx. %1,0,%2 \n\ + bne- 0b \n\ +" : "=&b"(result), "=&r"(tmp) : "r" (mem), "Ir"(val) : "cr0", "memory"); + return result; +} + +static __ATOMICITY_INLINE void +__attribute__ ((unused)) +atomic_add_long (volatile long *mem, int val) +{ + int tmp; + __asm__ ("\n\ +0: ldarx %0,0,%1 \n\ + add%I2 %0,%0,%2 \n\ + stdcx. %0,0,%1 \n\ + bne- 0b \n\ +" : "=&b"(tmp) : "r" (mem), "Ir"(val) : "cr0", "memory"); +} + + +static __ATOMICITY_INLINE int +__attribute__ ((unused)) +exchange_and_add_long (volatile long *mem, int val) +{ + int tmp, result; + __asm__ ("\n\ +0: ldarx %0,0,%2 \n\ + add%I3 %1,%0,%3 \n\ + stdcx. %1,0,%2 \n\ + bne- 0b \n\ +" : "=&b"(result), "=&r"(tmp) : "r" (mem), "Ir"(val) : "cr0", "memory"); + return result; +} + +static __ATOMICITY_INLINE void +__attribute__ ((unused)) +atomic_add (volatile uint32_t *mem, int val) +{ + int tmp; + __asm__ ("\n\ +0: lwarx %0,0,%1 \n\ + add%I2 %0,%0,%2 \n\ + stwcx. %0,0,%1 \n\ + bne- 0b \n\ +" : "=&b"(tmp) : "r" (mem), "Ir"(val) : "cr0", "memory"); +} + +static __ATOMICITY_INLINE int +__attribute__ ((unused)) +compare_and_swap (volatile long int *p, long int oldval, long int newval) +{ + int result; + __asm__ ("\n\ +0: ldarx %0,0,%1 \n\ + sub%I2c. %0,%0,%2 \n\ + cntlzw %0,%0 \n\ + bne- 1f \n\ + stdcx. %3,0,%1 \n\ + bne- 0b \n\ +1: \n\ +" : "=&b"(result) : "r"(p), "Ir"(oldval), "r"(newval) : "cr0", "memory"); + return result >> 5; +} + +static __ATOMICITY_INLINE long int +__attribute__ ((unused)) +always_swap (volatile long int *p, long int newval) +{ + long int result; + __asm__ ("\n\ +0: ldarx %0,0,%1 \n\ + stdcx. %2,0,%1 \n\ + bne- 0b \n\ +" : "=&r"(result) : "r"(p), "r"(newval) : "cr0", "memory"); + return result; +} + +static __ATOMICITY_INLINE int +__attribute__ ((unused)) +test_and_set (volatile long int *p, long int newval) +{ + int result; + __asm__ ("\n\ +0: ldarx %0,0,%1 \n\ + cmpdi %0,0 \n\ + bne- 1f \n\ + stdcx. %2,0,%1 \n\ + bne- 0b \n\ +1: \n\ +" : "=&r"(result) : "r"(p), "r"(newval) : "cr0", "memory"); + return result; +} + +#endif /* atomicity.h */ |