diff options
Diffstat (limited to 'sysdeps/mach/mips/machine-lock.h')
| -rw-r--r-- | sysdeps/mach/mips/machine-lock.h | 63 |
1 files changed, 41 insertions, 22 deletions
diff --git a/sysdeps/mach/mips/machine-lock.h b/sysdeps/mach/mips/machine-lock.h index 628aae41bb..91d39e3753 100644 --- a/sysdeps/mach/mips/machine-lock.h +++ b/sysdeps/mach/mips/machine-lock.h @@ -1,25 +1,28 @@ /* Machine-specific definition for spin locks. MIPS version. -Copyright (C) 1994 Free Software Foundation, Inc. -This file is part of the GNU C Library. + Copyright (C) 1996, 1997 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 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. + 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., 675 Mass Ave, -Cambridge, MA 02139, USA. */ + 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 _MACHINE_LOCK_H #define _MACHINE_LOCK_H +/* To get the TAS pseudo-instruction. */ +#include <mach/mips/mips_instruction.h> + /* The type of a spin lock variable. */ typedef __volatile int __spin_lock_t; @@ -46,19 +49,35 @@ __spin_unlock (__spin_lock_t *__lock) _EXTERN_INLINE int __spin_try_lock (register __spin_lock_t *__lock) { - register int __rtn; +#if (__mips >= 2) + int __rtn; + __asm__ __volatile (".set noreorder"); -#if 0 - __asm__ __volatile ("lw %0,0(%1)": "=r" (__rtn) : "r" (__lock)); - __asm__ __volatile ("sw %0,0(%0)": : "r" (__lock)); - __asm__ __volatile ("xor %0,%1,%0": "=r" (__rtn) : "r" (__lock)); +#if (__mips64) + __asm__ __volatile ("lld %0,0(%1)" : "=r" (__rtn) : "r" (__lock)); #else - /* Use the Mach microkernel's emulated TAS pseudo-instruction. */ - register int __rtn __asm__ ("a0"); - __asm__ __volatile (".word 0xf ! %0 " : "=r" (__rtn) : "0" (__lock)); + __asm__ __volatile ("ll %0,0(%1)" : "=r" (__rtn) : "r" (__lock)); +#endif + if (__rtn) + return 0; + __asm__ __volatile ("move %0,%1" : "=r" (__rtn) : "r" (__lock)); +#if (__mips64) + __asm__ __volatile ("scd %0,0(%1)" : "=r" (__rtn) : "r" (__lock)); +#else + __asm__ __volatile ("sc %0,0(%1)" : "=r" (__rtn) : "r" (__lock)); #endif __asm__ __volatile (".set reorder"); + return __rtn; +#else + register int __rtn __asm__ ("a0"); + + /* Use the Mach microkernel's emulated TAS pseudo-instruction. */ + __asm__ __volatile (".set noreorder"); + __asm__ __volatile (".word %1" : "=r" (__rtn) : "i" (op_tas), "0" (__lock)); + __asm__ __volatile ("nop"); + __asm__ __volatile (".set reorder"); return __rtn ^ (int) __lock; +#endif } /* Return nonzero if LOCK is locked. */ |