1 /* Copyright (C) 2005-2013 Free Software Foundation, Inc. 2 Contributed by Richard Henderson <rth@redhat.com>. 3 4 This file is part of the GNU OpenMP Library (libgomp). 5 6 Libgomp is free software; you can redistribute it and/or modify it 7 under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 3, or (at your option) 9 any later version. 10 11 Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY 12 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 13 FOR A PARTICULAR PURPOSE. See the GNU General Public License for 14 more details. 15 16 Under Section 7 of GPL version 3, you are granted additional 17 permissions described in the GCC Runtime Library Exception, version 18 3.1, as published by the Free Software Foundation. 19 20 You should have received a copy of the GNU General Public License and 21 a copy of the GCC Runtime Library Exception along with this program; 22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23 <http://www.gnu.org/licenses/>. */ 24 25 /* Provide target-specific access to the futex system call. */ 26 27 #ifndef SYS_futex 28 #define SYS_futex 394 29 #endif 30 31 32 static inline void 33 futex_wait (int *addr, int val) 34 { 35 register long sc_0 __asm__("$0"); 36 register long sc_16 __asm__("$16"); 37 register long sc_17 __asm__("$17"); 38 register long sc_18 __asm__("$18"); 39 register long sc_19 __asm__("$19"); 40 41 sc_0 = SYS_futex; 42 sc_16 = (long) addr; 43 sc_17 = gomp_futex_wait; 44 sc_18 = val; 45 sc_19 = 0; 46 __asm volatile ("callsys" 47 : "=r" (sc_0), "=r"(sc_19) 48 : "0"(sc_0), "r" (sc_16), "r"(sc_17), "r"(sc_18), "1"(sc_19) 49 : "$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8", 50 "$22", "$23", "$24", "$25", "$27", "$28", "memory"); 51 if (__builtin_expect (sc_19, 0) && sc_0 == ENOSYS) 52 { 53 gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG; 54 gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG; 55 sc_0 = SYS_futex; 56 sc_17 &= ~FUTEX_PRIVATE_FLAG; 57 sc_19 = 0; 58 __asm volatile ("callsys" 59 : "=r" (sc_0), "=r"(sc_19) 60 : "0"(sc_0), "r" (sc_16), "r"(sc_17), "r"(sc_18), 61 "1"(sc_19) 62 : "$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8", 63 "$22", "$23", "$24", "$25", "$27", "$28", "memory"); 64 } 65 } 66 67 static inline void 68 futex_wake (int *addr, int count) 69 { 70 register long sc_0 __asm__("$0"); 71 register long sc_16 __asm__("$16"); 72 register long sc_17 __asm__("$17"); 73 register long sc_18 __asm__("$18"); 74 register long sc_19 __asm__("$19"); 75 76 sc_0 = SYS_futex; 77 sc_16 = (long) addr; 78 sc_17 = gomp_futex_wake; 79 sc_18 = count; 80 __asm volatile ("callsys" 81 : "=r" (sc_0), "=r"(sc_19) 82 : "0"(sc_0), "r" (sc_16), "r"(sc_17), "r"(sc_18) 83 : "$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8", 84 "$22", "$23", "$24", "$25", "$27", "$28", "memory"); 85 if (__builtin_expect (sc_19, 0) && sc_0 == ENOSYS) 86 { 87 gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG; 88 gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG; 89 sc_0 = SYS_futex; 90 sc_17 &= ~FUTEX_PRIVATE_FLAG; 91 __asm volatile ("callsys" 92 : "=r" (sc_0), "=r"(sc_19) 93 : "0"(sc_0), "r" (sc_16), "r"(sc_17), "r"(sc_18) 94 : "$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8", 95 "$22", "$23", "$24", "$25", "$27", "$28", "memory"); 96 } 97 } 98 99 static inline void 100 cpu_relax (void) 101 { 102 __asm volatile ("" : : : "memory"); 103 } 104