| /* Copyright (C) 2005 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 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. |
| |
| 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 Lesser General Public License for |
| more details. |
| |
| You should have received a copy of the GNU Lesser General Public License |
| along with libgomp; see the file COPYING.LIB. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, |
| MA 02110-1301, USA. */ |
| |
| /* As a special exception, if you link this library with other files, some |
| of which are compiled with GCC, to produce an executable, this library |
| does not by itself cause the resulting executable to be covered by the |
| GNU General Public License. This exception does not however invalidate |
| any other reasons why the executable file might be covered by the GNU |
| General Public License. */ |
| |
| /* Provide target-specific access to the futex system call. */ |
| |
| #define FUTEX_WAIT 0 |
| #define FUTEX_WAKE 1 |
| |
| #ifdef __LP64__ |
| # ifndef SYS_futex |
| # define SYS_futex 202 |
| # endif |
| |
| static inline void |
| futex_wait (int *addr, int val) |
| { |
| register long r10 __asm__("%r10") = 0; |
| long res; |
| |
| __asm volatile ("syscall" |
| : "=a" (res) |
| : "0"(SYS_futex), "D" (addr), "S"(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"(FUTEX_WAKE), "d"(count) |
| : "r11", "rcx", "memory"); |
| } |
| #else |
| # ifndef SYS_futex |
| # define SYS_futex 240 |
| # endif |
| |
| # ifdef __PIC__ |
| |
| static inline void |
| 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"); |
| } |
| |
| # else |
| |
| static inline void |
| 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"); |
| } |
| |
| # endif /* __PIC__ */ |
| |
| static inline void |
| futex_wait (int *addr, int val) |
| { |
| sys_futex0 (addr, FUTEX_WAIT, val); |
| } |
| |
| static inline void |
| futex_wake (int *addr, int count) |
| { |
| sys_futex0 (addr, FUTEX_WAKE, count); |
| } |
| |
| #endif /* __LP64__ */ |