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/* Copyright (C) 2008-2015 Free Software Foundation, Inc.
Contributed by Richard Henderson <rth@redhat.com>.
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/>. */
#ifdef __x86_64__
# ifndef SYS_futex
# define SYS_futex 202
# endif
static inline long
sys_futex0 (std::atomic<int> *addr, long op, long val)
{
register long r10 __asm__("%r10") = 0;
long res;
__asm volatile ("syscall"
: "=a" (res)
: "0" (SYS_futex), "D" (addr), "S" (op), "d" (val), "r" (r10)
: "r11", "rcx", "memory");
return res;
}
#else
# ifndef SYS_futex
# define SYS_futex 240
# endif
# ifdef __PIC__
static inline long
sys_futex0 (std::atomic<int> *addr, int op, int val)
{
long res;
__asm volatile ("xchgl\t%%ebx, %2\n\t"
"int\t$0x80\n\t"
"xchgl\t%%ebx, %2"
: "=a" (res)
: "0"(SYS_futex), "r" (addr), "c"(op),
"d"(val), "S"(0)
: "memory");
return res;
}
# else
static inline long
sys_futex0 (std::atomic<int> *addr, int op, int val)
{
long res;
__asm volatile ("int $0x80"
: "=a" (res)
: "0"(SYS_futex), "b" (addr), "c"(op),
"d"(val), "S"(0)
: "memory");
return res;
}
# endif /* __PIC__ */
#endif /* __x86_64__ */
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