1 /* Copyright (C) 2011-2024 Free Software Foundation, Inc.
3 This file is part of the GNU Transactional Memory Library (libitm).
5 Libitm is free software; you can redistribute it and/or modify it
6 under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 3 of the License, or
8 (at your option) any later version.
10 Libitm is distributed in the hope that it will be useful, but WITHOUT ANY
11 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
12 FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 Under Section 7 of GPL version 3, you are granted additional
16 permissions described in the GCC Runtime Library Exception, version
17 3.1, as published by the Free Software Foundation.
19 You should have received a copy of the GNU General Public License and
20 a copy of the GCC Runtime Library Exception along with this program;
21 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
22 <http://www.gnu.org/licenses/>. */
24 /* Provide target-specific access to the futex system call. */
26 #include <sys/syscall.h>
28 /* 4 instruction cycles not accessing cache and TLB are needed after
29 trapa instruction to avoid an SH-4 silicon bug. */
31 #define SYSCALL_WITH_INST_PAD "\
32 trapa #0x14; or r0,r0; or r0,r0; or r0,r0; or r0,r0; or r0,r0"
35 sys_futex0 (std::atomic
<int> *addr
, int op
, int val
)
38 register long __r3
asm ("r3") = SYS_futex
;
39 register long __r4
asm ("r4") = (long) addr
;
40 register long __r5
asm ("r5") = op
;
41 register long __r6
asm ("r6") = val
;
42 register long __r7
asm ("r7") = 0;
44 __asm
__volatile (SYSCALL_WITH_INST_PAD
46 : "r" (__r3
), "r" (__r4
), "r" (__r5
),
47 "r" (__r6
), "r" (__r7
)