96 lines
2.9 KiB
C
96 lines
2.9 KiB
C
/* Copyright (C) 2005-2021 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 g1 __asm__ ("g1");
|
|
register long int o0 __asm__ ("o0");
|
|
register long int o1 __asm__ ("o1");
|
|
register long int o2 __asm__ ("o2");
|
|
register long int o3 __asm__ ("o3");
|
|
|
|
g1 = SYS_futex;
|
|
o0 = (long) addr;
|
|
o1 = op;
|
|
o2 = val;
|
|
o3 = 0;
|
|
|
|
#ifdef __arch64__
|
|
# define SYSCALL_STRING "ta\t0x6d; bcs,a,pt %%xcc, 1f; sub %%g0, %%o0, %%o0; 1:"
|
|
#else
|
|
# define SYSCALL_STRING "ta\t0x10; bcs,a 1f; sub %%g0, %%o0, %%o0; 1:"
|
|
#endif
|
|
|
|
__asm volatile (SYSCALL_STRING
|
|
: "=r" (g1), "=r" (o0)
|
|
: "0" (g1), "1" (o0), "r" (o1), "r" (o2), "r" (o3)
|
|
: "g2", "g3", "g4", "g5", "g6",
|
|
"f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",
|
|
"f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15",
|
|
"f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",
|
|
"f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31",
|
|
#ifdef __arch64__
|
|
"f32", "f34", "f36", "f38", "f40", "f42", "f44", "f46",
|
|
"f48", "f50", "f52", "f54", "f56", "f58", "f60", "f62",
|
|
#endif
|
|
"cc", "memory");
|
|
return o0;
|
|
}
|
|
|
|
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 ("rd %%ccr, %%g0" : : : "memory");
|
|
}
|