diff options
Diffstat (limited to 'linuxthreads/sysdeps/mips')
| -rw-r--r-- | linuxthreads/sysdeps/mips/pspinlock.c | 98 | ||||
| -rw-r--r-- | linuxthreads/sysdeps/mips/pt-machine.h | 92 |
2 files changed, 190 insertions, 0 deletions
diff --git a/linuxthreads/sysdeps/mips/pspinlock.c b/linuxthreads/sysdeps/mips/pspinlock.c new file mode 100644 index 0000000000..350aa7553c --- /dev/null +++ b/linuxthreads/sysdeps/mips/pspinlock.c @@ -0,0 +1,98 @@ +/* POSIX spinlock implementation. MIPS version. + Copyright (C) 2000, 2002, 2003, 2004 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; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <errno.h> +#include <pthread.h> +#include <sgidefs.h> +#include <sys/tas.h> +#include "internals.h" + +#include <sgidefs.h> + +/* This implementation is similar to the one used in the Linux kernel. */ +int +__pthread_spin_lock (pthread_spinlock_t *lock) +{ + unsigned int tmp1, tmp2; + + asm volatile + ("\t\t\t# spin_lock\n" + "1:\n\t" + ".set push\n\t" +#if _MIPS_SIM == _ABIO32 + ".set mips2\n\t" +#endif + "ll %1,%3\n\t" + "li %2,1\n\t" + "bnez %1,1b\n\t" + "sc %2,%0\n\t" + ".set pop\n\t" + "beqz %2,1b" + : "=m" (*lock), "=&r" (tmp1), "=&r" (tmp2) + : "m" (*lock) + : "memory"); + + return 0; +} + +weak_alias (__pthread_spin_lock, pthread_spin_lock) + + +int +__pthread_spin_trylock (pthread_spinlock_t *lock) +{ + /* To be done. */ + return 0; +} +weak_alias (__pthread_spin_trylock, pthread_spin_trylock) + + +int +__pthread_spin_unlock (pthread_spinlock_t *lock) +{ + asm volatile + ("\t\t\t# spin_unlock\n\t" + "sw $0,%0" + : "=m" (*lock) + : + : "memory"); + return 0; +} +weak_alias (__pthread_spin_unlock, pthread_spin_unlock) + + +int +__pthread_spin_init (pthread_spinlock_t *lock, int pshared) +{ + /* We can ignore the `pshared' parameter. Since we are busy-waiting + all processes which can access the memory location `lock' points + to can use the spinlock. */ + *lock = 0; + return 0; +} +weak_alias (__pthread_spin_init, pthread_spin_init) + + +int +__pthread_spin_destroy (pthread_spinlock_t *lock) +{ + /* Nothing to do. */ + return 0; +} +weak_alias (__pthread_spin_destroy, pthread_spin_destroy) diff --git a/linuxthreads/sysdeps/mips/pt-machine.h b/linuxthreads/sysdeps/mips/pt-machine.h new file mode 100644 index 0000000000..96f7a7f8c6 --- /dev/null +++ b/linuxthreads/sysdeps/mips/pt-machine.h @@ -0,0 +1,92 @@ +/* Machine-dependent pthreads configuration and inline functions. + + Copyright (C) 1996, 1997, 1998, 2000, 2002, 2003, 2004 + Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ralf Baechle <ralf@gnu.org>. + Based on the Alpha version by Richard Henderson <rth@tamu.edu>. + + 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; 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 _PT_MACHINE_H +#define _PT_MACHINE_H 1 + +#include <sgidefs.h> +#include <sys/tas.h> + +#ifndef PT_EI +# define PT_EI extern inline __attribute__ ((always_inline)) +#endif + +extern long int testandset (int *spinlock); +extern int __compare_and_swap (long int *p, long int oldval, long int newval); + + +/* Spinlock implementation; required. */ + +PT_EI long int +testandset (int *spinlock) +{ + return _test_and_set (spinlock, 1); +} + + +/* Get some notion of the current stack. Need not be exactly the top + of the stack, just something somewhere in the current frame. */ +#define CURRENT_STACK_FRAME stack_pointer +register char * stack_pointer __asm__ ("$29"); + + +/* Compare-and-swap for semaphores. */ + +#define HAS_COMPARE_AND_SWAP +PT_EI int +__compare_and_swap (long int *p, long int oldval, long int newval) +{ + long int ret, temp; + + __asm__ __volatile__ + ("/* Inline compare & swap */\n" + "1:\n\t" + ".set push\n\t" +#if _MIPS_SIM == _ABIO32 + ".set mips2\n\t" +#endif +#if _MIPS_SIM == _ABI64 + "lld %1,%5\n\t" +#else + "ll %1,%5\n\t" +#endif + "move %0,$0\n\t" + "bne %1,%3,2f\n\t" + "move %0,%4\n\t" +#if _MIPS_SIM == _ABI64 + "scd %0,%2\n\t" +#else + "sc %0,%2\n\t" +#endif + ".set pop\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; +} + +#endif /* pt-machine.h */ |