51 lines
1.8 KiB
C++
51 lines
1.8 KiB
C++
/* Copyright (C) 2011-2017 Free Software Foundation, Inc.
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This file is part of the GNU Transactional Memory Library (libitm).
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Libitm is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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Libitm is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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/* Provide target-specific access to the futex system call. */
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#include <sys/syscall.h>
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/* 4 instruction cycles not accessing cache and TLB are needed after
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trapa instruction to avoid an SH-4 silicon bug. */
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#define SYSCALL_WITH_INST_PAD "\
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trapa #0x14; or r0,r0; or r0,r0; or r0,r0; or r0,r0; or r0,r0"
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static inline long
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sys_futex0 (std::atomic<int> *addr, int op, int val)
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{
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int __status;
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register long __r3 asm ("r3") = SYS_futex;
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register long __r4 asm ("r4") = (long) addr;
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register long __r5 asm ("r5") = op;
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register long __r6 asm ("r6") = val;
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register long __r7 asm ("r7") = 0;
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__asm __volatile (SYSCALL_WITH_INST_PAD
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: "=z" (__status)
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: "r" (__r3), "r" (__r4), "r" (__r5),
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"r" (__r6), "r" (__r7)
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: "memory", "t");
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return __status;
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}
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