1 /* SPDX-License-Identifier: GPL-2.0 */
5 #include <linux/futex.h>
6 #include <linux/uaccess.h>
9 #define __futex_atomic_op1(insn, ret, oldval, uaddr, oparg) \
11 register unsigned long r8 __asm ("r8") = 0; \
12 __asm__ __volatile__( \
14 "[1:] " insn ";; \n" \
15 " .xdata4 \"__ex_table\", 1b-., 2f-. \n" \
17 : "+r" (r8), "=r" (oldval) \
18 : "r" (uaddr), "r" (oparg) \
23 #define __futex_atomic_op2(insn, ret, oldval, uaddr, oparg) \
25 register unsigned long r8 __asm ("r8") = 0; \
28 __asm__ __volatile__( \
30 "[1:] ld4 %3=[%4];; \n" \
33 " mov ar.ccv=%2;; \n" \
34 "[2:] cmpxchg4.acq %1=[%4],%3,ar.ccv;; \n" \
35 " .xdata4 \"__ex_table\", 1b-., 3f-.\n" \
36 " .xdata4 \"__ex_table\", 2b-., 3f-.\n" \
38 : "+r" (r8), "=r" (val), "=&r" (oldval), \
40 : "r" (uaddr), "r" (oparg) \
44 } while (unlikely (val != oldval)); \
49 arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr)
53 if (!access_ok(uaddr, sizeof(u32)))
58 __futex_atomic_op1("xchg4 %1=[%2],%3", ret, oldval, uaddr,
62 __futex_atomic_op2("add %3=%3,%5", ret, oldval, uaddr, oparg);
65 __futex_atomic_op2("or %3=%3,%5", ret, oldval, uaddr, oparg);
68 __futex_atomic_op2("and %3=%3,%5", ret, oldval, uaddr,
72 __futex_atomic_op2("xor %3=%3,%5", ret, oldval, uaddr, oparg);
85 futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
86 u32 oldval, u32 newval)
88 if (!access_ok(uaddr, sizeof(u32)))
92 register unsigned long r8 __asm ("r8") = 0;
97 "[1:] cmpxchg4.acq %1=[%2],%3,ar.ccv \n"
98 " .xdata4 \"__ex_table\", 1b-., 2f-. \n"
100 : "+r" (r8), "=&r" (prev)
101 : "r" (uaddr), "r" (newval),
102 "rO" ((long) (unsigned) oldval)
109 #endif /* _ASM_FUTEX_H */