1 /* Copyright (C) 2005, 2008, 2009 Free Software Foundation, Inc. 2 Contributed by Jakub Jelinek <jakub@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 #include <sys/syscall.h> 28 29 static inline long 30 sys_futex0 (int *addr, int op, int val) 31 { 32 register long int g1 __asm__ ("g1"); 33 register long int o0 __asm__ ("o0"); 34 register long int o1 __asm__ ("o1"); 35 register long int o2 __asm__ ("o2"); 36 register long int o3 __asm__ ("o3"); 37 38 g1 = SYS_futex; 39 o0 = (long) addr; 40 o1 = op; 41 o2 = val; 42 o3 = 0; 43 44 #ifdef __arch64__ 45 # define SYSCALL_STRING "ta\t0x6d; bcs,a,pt %%xcc, 1f; sub %%g0, %%o0, %%o0; 1:" 46 #else 47 # define SYSCALL_STRING "ta\t0x10; bcs,a 1f; sub %%g0, %%o0, %%o0; 1:" 48 #endif 49 50 __asm volatile (SYSCALL_STRING 51 : "=r" (g1), "=r" (o0) 52 : "0" (g1), "1" (o0), "r" (o1), "r" (o2), "r" (o3) 53 : "g2", "g3", "g4", "g5", "g6", 54 "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", 55 "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", 56 "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23", 57 "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31", 58 #ifdef __arch64__ 59 "f32", "f34", "f36", "f38", "f40", "f42", "f44", "f46", 60 "f48", "f50", "f52", "f54", "f56", "f58", "f60", "f62", 61 #endif 62 "cc", "memory"); 63 return o0; 64 } 65 66 static inline void 67 futex_wait (int *addr, int val) 68 { 69 long err = sys_futex0 (addr, gomp_futex_wait, val); 70 if (__builtin_expect (err == ENOSYS, 0)) 71 { 72 gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG; 73 gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG; 74 sys_futex0 (addr, gomp_futex_wait, val); 75 } 76 } 77 78 static inline void 79 futex_wake (int *addr, int count) 80 { 81 long err = sys_futex0 (addr, gomp_futex_wake, count); 82 if (__builtin_expect (err == ENOSYS, 0)) 83 { 84 gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG; 85 gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG; 86 sys_futex0 (addr, gomp_futex_wake, count); 87 } 88 } 89 90 static inline void 91 cpu_relax (void) 92 { 93 #if defined __arch64__ || defined __sparc_v9__ 94 __asm volatile ("membar #LoadLoad" : : : "memory"); 95 #else 96 __asm volatile ("" : : : "memory"); 97 #endif 98 } 99 100 static inline void 101 atomic_write_barrier (void) 102 { 103 #if defined __arch64__ || defined __sparc_v9__ 104 __asm volatile ("membar #StoreStore" : : : "memory"); 105 #else 106 __sync_synchronize (); 107 #endif 108 } 109