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57 lines
1.9 KiB
C++
57 lines
1.9 KiB
C++
/* Copyright (C) 2008-2017 Free Software Foundation, Inc.
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Contributed by Richard Henderson <rth@redhat.com>.
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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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#ifndef SYS_futex
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#define SYS_futex 394
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#endif
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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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register long sc_0 __asm__("$0");
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register long sc_16 __asm__("$16");
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register long sc_17 __asm__("$17");
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register long sc_18 __asm__("$18");
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register long sc_19 __asm__("$19");
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long res;
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sc_0 = SYS_futex;
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sc_16 = (long) addr;
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sc_17 = op;
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sc_18 = val;
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sc_19 = 0;
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__asm volatile ("callsys"
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: "=r" (sc_0), "=r"(sc_19)
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: "0"(sc_0), "r" (sc_16), "r"(sc_17), "r"(sc_18), "1"(sc_19)
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: "$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8",
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"$22", "$23", "$24", "$25", "$27", "$28", "memory");
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res = sc_0;
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if (__builtin_expect (sc_19, 0))
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res = -res;
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return res;
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}
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