diff options
Diffstat (limited to 'libpthread')
| -rw-r--r-- | libpthread/linuxthreads/sysdeps/nds32/pspinlock.c | 102 | ||||
| -rw-r--r-- | libpthread/linuxthreads/sysdeps/nds32/pt-machine.h | 66 |
2 files changed, 168 insertions, 0 deletions
diff --git a/libpthread/linuxthreads/sysdeps/nds32/pspinlock.c b/libpthread/linuxthreads/sysdeps/nds32/pspinlock.c new file mode 100644 index 000000000..f8adf07be --- /dev/null +++ b/libpthread/linuxthreads/sysdeps/nds32/pspinlock.c @@ -0,0 +1,102 @@ +/* + * Copyright (C) 2016 Andes Technology, Inc. + * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball. + */ + +/* POSIX spinlock implementation. + Copyright (C) 2000 Free Software Foundation, Inc. + + 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 "internals.h" + +int +__pthread_spin_lock (pthread_spinlock_t *lock) +{ + unsigned int val ; + unsigned int temp ; + unsigned int offset = 0 ; + + __asm__ __volatile__ ( + "1:\n\t" + "llw %0, [%1 + %2 << 0]\n\t" + "bnez %0, 1b\n\t" + "movi %3, #0x1\n\t" + "scw %3, [%1 + %2 << 0]\n\t" + "beqz %3, 1b\n\t" + : "=&r" (val) + : "r" (lock), "r" (offset), "r" (temp) + : "memory" ) ; + + return 0 ; +} +weak_alias (__pthread_spin_lock, pthread_spin_lock) + + +int +__pthread_spin_trylock (pthread_spinlock_t *lock) +{ + unsigned int val ; + unsigned int temp ; + unsigned int offset = 0 ; + + __asm__ __volatile__ ( + "llw %0, [%1 + %2 << 0]\n\t" + "bnez %0, 1f\n\t" + "movi %3, #0x1\n\t" + "scw %3, [%1 + %2 << 0]\n\t" + "beqz %3, 1f\n\t" + "movi %0, #0x0\n\t" + "b 2f\n\t" + "1:\n\t" + "movi %0, #16\n\t" + "2:\n\t" + : "=&r" (val) + : "r" (lock), "r" (offset), "r" (temp) + : "memory" ) ; + + return val; +} +weak_alias (__pthread_spin_trylock, pthread_spin_trylock) + +int +__pthread_spin_unlock (pthread_spinlock_t *lock) +{ + return *lock = 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. */ + return *lock = 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/libpthread/linuxthreads/sysdeps/nds32/pt-machine.h b/libpthread/linuxthreads/sysdeps/nds32/pt-machine.h new file mode 100644 index 000000000..5bbb9e850 --- /dev/null +++ b/libpthread/linuxthreads/sysdeps/nds32/pt-machine.h @@ -0,0 +1,66 @@ +/* + * Copyright (C) 2016 Andes Technology, Inc. + * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball. + */ + +/* Machine-dependent pthreads configuration and inline functions. + Copyright (C) 1997, 1998, 2000, 2002, 2003 Free Software Foundation, Inc. + Contributed by Philip Blundell <philb@gnu.org>. + + 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 <features.h> + +#ifndef PT_EI +# define PT_EI __extern_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) +{ + unsigned int val; + unsigned int temp; + unsigned int offset = 0; + + __asm__ __volatile__ ( + "1:\n\t" + "llw %[val], [%[spinlock] + %[offset] << 0]\n\t" + "move %[temp], #0x1\n\t" + "beq %[val], %[temp], 2f\n\t" + "scw %[temp], [%[spinlock] + %[offset] << 0]\n\t" + "beqz %[temp], 1b\n\t" + "2:\n\t" + : [val] "=&r" (val), [temp] "=&r" (temp) + : [spinlock] "r" (spinlock), [offset] "r" (offset) + : "memory" ) ; + + return val ; +} + + +/* 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__ ("$sp"); + +#endif /* pt-machine.h */ |