Viewing file:  futex_bits.h (1.82 KB) -rw-r--r--
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/* Copyright (C) 2011-2022 Free Software Foundation, Inc.
This file is part of the GNU Transactional Memory Library (libitm).
Libitm 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 of the License, or
(at your option) any later version.
Libitm 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>
/* 4 instruction cycles not accessing cache and TLB are needed after
trapa instruction to avoid an SH-4 silicon bug. */
#define SYSCALL_WITH_INST_PAD "\
trapa #0x14; or r0,r0; or r0,r0; or r0,r0; or r0,r0; or r0,r0"
static inline long
sys_futex0 (std::atomic<int> *addr, int op, int val)
{
int __status;
register long __r3 asm ("r3") = SYS_futex;
register long __r4 asm ("r4") = (long) addr;
register long __r5 asm ("r5") = op;
register long __r6 asm ("r6") = val;
register long __r7 asm ("r7") = 0;
__asm __volatile (SYSCALL_WITH_INST_PAD
: "=z" (__status)
: "r" (__r3), "r" (__r4), "r" (__r5),
"r" (__r6), "r" (__r7)
: "memory", "t");
return __status;
}
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