diff options
Diffstat (limited to 'libgomp/config/linux/x86')
| -rw-r--r-- | libgomp/config/linux/x86/futex.h | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/libgomp/config/linux/x86/futex.h b/libgomp/config/linux/x86/futex.h new file mode 100644 index 000000000..cb7461d89 --- /dev/null +++ b/libgomp/config/linux/x86/futex.h @@ -0,0 +1,153 @@ +/* Copyright (C) 2005, 2008, 2009 Free Software Foundation, Inc. + Contributed by Richard Henderson <rth@redhat.com>. + + This file is part of the GNU OpenMP Library (libgomp). + + Libgomp is free software; you can redistribute it and/or modify it + under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3, or (at your option) + any later version. + + Libgomp 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 General Public License for + more details. + + Under Section 7 of GPL version 3, you are granted additional + permissions described in the GCC Runtime Library Exception, version + 3.1, as published by the Free Software Foundation. + + You should have received a copy of the GNU General Public License and + a copy of the GCC Runtime Library Exception along with this program; + see the files COPYING3 and COPYING.RUNTIME respectively. If not, see + <http://www.gnu.org/licenses/>. */ + +/* Provide target-specific access to the futex system call. */ + +#ifdef __LP64__ +# ifndef SYS_futex +# define SYS_futex 202 +# endif + +static inline void +futex_wait (int *addr, int val) +{ + register long r10 __asm__("%r10"); + long res; + + r10 = 0; + __asm volatile ("syscall" + : "=a" (res) + : "0" (SYS_futex), "D" (addr), "S" (gomp_futex_wait), + "d" (val), "r" (r10) + : "r11", "rcx", "memory"); + if (__builtin_expect (res == -ENOSYS, 0)) + { + gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG; + gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG; + r10 = 0; + __asm volatile ("syscall" + : "=a" (res) + : "0" (SYS_futex), "D" (addr), "S" (gomp_futex_wait), + "d" (val), "r" (r10) + : "r11", "rcx", "memory"); + } +} + +static inline void +futex_wake (int *addr, int count) +{ + long res; + + __asm volatile ("syscall" + : "=a" (res) + : "0" (SYS_futex), "D" (addr), "S" (gomp_futex_wake), + "d" (count) + : "r11", "rcx", "memory"); + if (__builtin_expect (res == -ENOSYS, 0)) + { + gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG; + gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG; + __asm volatile ("syscall" + : "=a" (res) + : "0" (SYS_futex), "D" (addr), "S" (gomp_futex_wake), + "d" (count) + : "r11", "rcx", "memory"); + } +} +#else +# ifndef SYS_futex +# define SYS_futex 240 +# endif + +# ifdef __PIC__ + +static inline long +sys_futex0 (int *addr, int op, int val) +{ + long res; + + __asm volatile ("xchgl\t%%ebx, %2\n\t" + "int\t$0x80\n\t" + "xchgl\t%%ebx, %2" + : "=a" (res) + : "0"(SYS_futex), "r" (addr), "c"(op), + "d"(val), "S"(0) + : "memory"); + return res; +} + +# else + +static inline long +sys_futex0 (int *addr, int op, int val) +{ + long res; + + __asm volatile ("int $0x80" + : "=a" (res) + : "0"(SYS_futex), "b" (addr), "c"(op), + "d"(val), "S"(0) + : "memory"); + return res; +} + +# endif /* __PIC__ */ + +static inline void +futex_wait (int *addr, int val) +{ + long res = sys_futex0 (addr, gomp_futex_wait, val); + if (__builtin_expect (res == -ENOSYS, 0)) + { + gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG; + gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG; + sys_futex0 (addr, gomp_futex_wait, val); + } +} + +static inline void +futex_wake (int *addr, int count) +{ + long res = sys_futex0 (addr, gomp_futex_wake, count); + if (__builtin_expect (res == -ENOSYS, 0)) + { + gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG; + gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG; + sys_futex0 (addr, gomp_futex_wake, count); + } +} + +#endif /* __LP64__ */ + +static inline void +cpu_relax (void) +{ + __asm volatile ("rep; nop" : : : "memory"); +} + +static inline void +atomic_write_barrier (void) +{ + __sync_synchronize (); +} |