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2 * Copyright (C) 2012 ARM Ltd.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
21 #include <linux/futex.h>
22 #include <linux/uaccess.h>
24 #include <asm/errno.h>
26 #define __futex_atomic_op(insn, ret, oldval, uaddr, tmp, oparg) \
30 " prfm pstl1strm, %2\n" \
33 "2: stlxr %w3, %w0, %2\n" \
37 " .pushsection .fixup,\"ax\"\n" \
42 _ASM_EXTABLE(1b, 4b) \
43 _ASM_EXTABLE(2b, 4b) \
44 : "=&r" (ret), "=&r" (oldval), "+Q" (*uaddr), "=&r" (tmp) \
45 : "r" (oparg), "Ir" (-EFAULT) \
51 arch_futex_atomic_op_inuser(int op
, int oparg
, int *oval
, u32 __user
*uaddr
)
53 int oldval
= 0, ret
, tmp
;
59 __futex_atomic_op("mov %w0, %w4",
60 ret
, oldval
, uaddr
, tmp
, oparg
);
63 __futex_atomic_op("add %w0, %w1, %w4",
64 ret
, oldval
, uaddr
, tmp
, oparg
);
67 __futex_atomic_op("orr %w0, %w1, %w4",
68 ret
, oldval
, uaddr
, tmp
, oparg
);
71 __futex_atomic_op("and %w0, %w1, %w4",
72 ret
, oldval
, uaddr
, tmp
, ~oparg
);
75 __futex_atomic_op("eor %w0, %w1, %w4",
76 ret
, oldval
, uaddr
, tmp
, oparg
);
91 futex_atomic_cmpxchg_inatomic(u32
*uval
, u32 __user
*uaddr
,
92 u32 oldval
, u32 newval
)
97 if (!access_ok(VERIFY_WRITE
, uaddr
, sizeof(u32
)))
101 asm volatile("// futex_atomic_cmpxchg_inatomic\n"
102 " prfm pstl1strm, %2\n"
104 " sub %w3, %w1, %w4\n"
106 "2: stlxr %w3, %w5, %2\n"
110 " .pushsection .fixup,\"ax\"\n"
116 : "+r" (ret
), "=&r" (val
), "+Q" (*uaddr
), "=&r" (tmp
)
117 : "r" (oldval
), "r" (newval
), "Ir" (-EFAULT
)
125 #endif /* __KERNEL__ */
126 #endif /* __ASM_FUTEX_H */