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- /* Copyright (C) 2005-2022 Free Software Foundation, Inc.
- Contributed by Jakub Jelinek <jakub@redhat.com>.
- This file is part of the GNU Offloading and Multi Processing 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. */
- #include <sys/syscall.h>
- static inline long
- sys_futex0 (int *addr, int op, int val)
- {
- register long int gpr2 __asm__ ("2");
- register long int gpr3 __asm__ ("3");
- register long int gpr4 __asm__ ("4");
- register long int gpr5 __asm__ ("5");
- gpr2 = (long) addr;
- gpr3 = op;
- gpr4 = val;
- gpr5 = 0;
- __asm volatile ("svc %b1"
- : "=d" (gpr2)
- : "i" (SYS_futex),
- "0" (gpr2), "d" (gpr3), "d" (gpr4), "d" (gpr5)
- : "memory");
- return gpr2;
- }
- static inline void
- futex_wait (int *addr, int val)
- {
- long err = sys_futex0 (addr, gomp_futex_wait, val);
- if (__builtin_expect (err == -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 err = sys_futex0 (addr, gomp_futex_wake, count);
- if (__builtin_expect (err == -ENOSYS, 0))
- {
- gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG;
- gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG;
- sys_futex0 (addr, gomp_futex_wake, count);
- }
- }
- static inline void
- cpu_relax (void)
- {
- __asm volatile ("" : : : "memory");
- }
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