1 1.1.1.12 mrg /* Copyright (C) 2005-2024 Free Software Foundation, Inc. 2 1.1 mrg Contributed by Jakub Jelinek <jakub (at) redhat.com>. 3 1.1 mrg 4 1.1.1.3 mrg This file is part of the GNU Offloading and Multi Processing Library 5 1.1.1.3 mrg (libgomp). 6 1.1 mrg 7 1.1 mrg Libgomp is free software; you can redistribute it and/or modify it 8 1.1 mrg under the terms of the GNU General Public License as published by 9 1.1 mrg the Free Software Foundation; either version 3, or (at your option) 10 1.1 mrg any later version. 11 1.1 mrg 12 1.1 mrg Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY 13 1.1 mrg WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 14 1.1 mrg FOR A PARTICULAR PURPOSE. See the GNU General Public License for 15 1.1 mrg more details. 16 1.1 mrg 17 1.1 mrg Under Section 7 of GPL version 3, you are granted additional 18 1.1 mrg permissions described in the GCC Runtime Library Exception, version 19 1.1 mrg 3.1, as published by the Free Software Foundation. 20 1.1 mrg 21 1.1 mrg You should have received a copy of the GNU General Public License and 22 1.1 mrg a copy of the GCC Runtime Library Exception along with this program; 23 1.1 mrg see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 24 1.1 mrg <http://www.gnu.org/licenses/>. */ 25 1.1 mrg 26 1.1 mrg /* Provide target-specific access to the futex system call. */ 27 1.1 mrg 28 1.1 mrg #include <sys/syscall.h> 29 1.1 mrg 30 1.1 mrg static inline long 31 1.1 mrg sys_futex0 (int *addr, int op, int val) 32 1.1 mrg { 33 1.1 mrg register long int g1 __asm__ ("g1"); 34 1.1 mrg register long int o0 __asm__ ("o0"); 35 1.1 mrg register long int o1 __asm__ ("o1"); 36 1.1 mrg register long int o2 __asm__ ("o2"); 37 1.1 mrg register long int o3 __asm__ ("o3"); 38 1.1 mrg 39 1.1 mrg g1 = SYS_futex; 40 1.1 mrg o0 = (long) addr; 41 1.1 mrg o1 = op; 42 1.1 mrg o2 = val; 43 1.1 mrg o3 = 0; 44 1.1 mrg 45 1.1 mrg #ifdef __arch64__ 46 1.1 mrg # define SYSCALL_STRING "ta\t0x6d; bcs,a,pt %%xcc, 1f; sub %%g0, %%o0, %%o0; 1:" 47 1.1 mrg #else 48 1.1 mrg # define SYSCALL_STRING "ta\t0x10; bcs,a 1f; sub %%g0, %%o0, %%o0; 1:" 49 1.1 mrg #endif 50 1.1 mrg 51 1.1 mrg __asm volatile (SYSCALL_STRING 52 1.1 mrg : "=r" (g1), "=r" (o0) 53 1.1 mrg : "0" (g1), "1" (o0), "r" (o1), "r" (o2), "r" (o3) 54 1.1 mrg : "g2", "g3", "g4", "g5", "g6", 55 1.1 mrg "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", 56 1.1 mrg "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", 57 1.1 mrg "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23", 58 1.1 mrg "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31", 59 1.1 mrg #ifdef __arch64__ 60 1.1 mrg "f32", "f34", "f36", "f38", "f40", "f42", "f44", "f46", 61 1.1 mrg "f48", "f50", "f52", "f54", "f56", "f58", "f60", "f62", 62 1.1 mrg #endif 63 1.1 mrg "cc", "memory"); 64 1.1 mrg return o0; 65 1.1 mrg } 66 1.1 mrg 67 1.1 mrg static inline void 68 1.1 mrg futex_wait (int *addr, int val) 69 1.1 mrg { 70 1.1 mrg long err = sys_futex0 (addr, gomp_futex_wait, val); 71 1.1 mrg if (__builtin_expect (err == ENOSYS, 0)) 72 1.1 mrg { 73 1.1 mrg gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG; 74 1.1 mrg gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG; 75 1.1 mrg sys_futex0 (addr, gomp_futex_wait, val); 76 1.1 mrg } 77 1.1 mrg } 78 1.1 mrg 79 1.1 mrg static inline void 80 1.1 mrg futex_wake (int *addr, int count) 81 1.1 mrg { 82 1.1 mrg long err = sys_futex0 (addr, gomp_futex_wake, count); 83 1.1 mrg if (__builtin_expect (err == ENOSYS, 0)) 84 1.1 mrg { 85 1.1 mrg gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG; 86 1.1 mrg gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG; 87 1.1 mrg sys_futex0 (addr, gomp_futex_wake, count); 88 1.1 mrg } 89 1.1 mrg } 90 1.1 mrg 91 1.1 mrg static inline void 92 1.1 mrg cpu_relax (void) 93 1.1 mrg { 94 1.1.1.2 mrg __asm volatile ("rd %%ccr, %%g0" : : : "memory"); 95 1.1 mrg } 96
Indexes created Sun Mar 01 05:31:48 UTC 2026