1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_HEXAGON_FUTEX_H
3 #define _ASM_HEXAGON_FUTEX_H
7 #include <linux/futex.h>
8 #include <linux/uaccess.h>
11 /* XXX TODO-- need to add sync barriers! */
13 #define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \
15 "1: %0 = memw_locked(%3);\n" \
16 /* For example: %1 = %4 */ \
18 "2: memw_locked(%3,p2) = %1;\n" \
19 " if (!p2) jump 1b;\n" \
22 ".section .fixup,\"ax\"\n" \
26 ".section __ex_table,\"a\"\n" \
27 ".long 1b,4b,2b,4b\n" \
29 : "=&r" (oldval), "=&r" (ret), "+m" (*uaddr) \
30 : "r" (uaddr), "r" (oparg), "i" (-EFAULT) \
35 arch_futex_atomic_op_inuser(int op
, int oparg
, int *oval
, u32 __user
*uaddr
)
39 if (!access_ok(uaddr
, sizeof(u32
)))
44 __futex_atomic_op("%1 = %4\n", ret
, oldval
, uaddr
, oparg
);
47 __futex_atomic_op("%1 = add(%0,%4)\n", ret
, oldval
, uaddr
,
51 __futex_atomic_op("%1 = or(%0,%4)\n", ret
, oldval
, uaddr
,
55 __futex_atomic_op("%1 = not(%4); %1 = and(%0,%1)\n", ret
,
56 oldval
, uaddr
, oparg
);
59 __futex_atomic_op("%1 = xor(%0,%4)\n", ret
, oldval
, uaddr
,
73 futex_atomic_cmpxchg_inatomic(u32
*uval
, u32 __user
*uaddr
, u32 oldval
,
79 if (!access_ok(uaddr
, sizeof(u32
)))
82 __asm__
__volatile__ (
83 "1: %1 = memw_locked(%3)\n"
85 " p2 = cmp.eq(%1,%4)\n"
86 " if (!p2.new) jump:NT 3f\n"
88 "2: memw_locked(%3,p2) = %5\n"
91 ".section .fixup,\"ax\"\n"
95 ".section __ex_table,\"a\"\n"
98 : "+r" (ret
), "=&r" (prev
), "+m" (*uaddr
)
99 : "r" (uaddr
), "r" (oldval
), "r" (newval
), "i"(-EFAULT
)
106 #endif /* __KERNEL__ */
107 #endif /* _ASM_HEXAGON_FUTEX_H */