1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _SPARC64_FUTEX_H
3 #define _SPARC64_FUTEX_H
4
5 #include <linux/futex.h>
6 #include <linux/uaccess.h>
7 #include <asm/errno.h>
8
9 #define __futex_cas_op(insn, ret, oldval, uaddr, oparg) \
10 __asm__ __volatile__( \
11 "\n1: lduwa [%3] %%asi, %2\n" \
12 " " insn "\n" \
13 "2: casa [%3] %%asi, %2, %1\n" \
14 " cmp %2, %1\n" \
15 " bne,pn %%icc, 1b\n" \
16 " mov 0, %0\n" \
17 "3:\n" \
18 " .section .fixup,#alloc,#execinstr\n" \
19 " .align 4\n" \
20 "4: sethi %%hi(3b), %0\n" \
21 " jmpl %0 + %%lo(3b), %%g0\n" \
22 " mov %5, %0\n" \
23 " .previous\n" \
24 " .section __ex_table,\"a\"\n" \
25 " .align 4\n" \
26 " .word 1b, 4b\n" \
27 " .word 2b, 4b\n" \
28 " .previous\n" \
29 : "=&r" (ret), "=&r" (oldval), "=&r" (tem) \
30 : "r" (uaddr), "r" (oparg), "i" (-EFAULT) \
31 : "memory")
32
33 static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
34 u32 __user *uaddr)
35 {
36 int oldval = 0, ret, tem;
37
38 if (unlikely((((unsigned long) uaddr) & 0x3UL)))
39 return -EINVAL;
40
41 switch (op) {
42 case FUTEX_OP_SET:
43 __futex_cas_op("mov\t%4, %1", ret, oldval, uaddr, oparg);
44 break;
45 case FUTEX_OP_ADD:
46 __futex_cas_op("add\t%2, %4, %1", ret, oldval, uaddr, oparg);
47 break;
48 case FUTEX_OP_OR:
49 __futex_cas_op("or\t%2, %4, %1", ret, oldval, uaddr, oparg);
50 break;
51 case FUTEX_OP_ANDN:
52 __futex_cas_op("andn\t%2, %4, %1", ret, oldval, uaddr, oparg);
53 break;
54 case FUTEX_OP_XOR:
55 __futex_cas_op("xor\t%2, %4, %1", ret, oldval, uaddr, oparg);
56 break;
57 default:
58 ret = -ENOSYS;
59 }
60
61 if (!ret)
62 *oval = oldval;
63
64 return ret;
65 }
66
67 static inline int
68 futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
69 u32 oldval, u32 newval)
70 {
71 int ret = 0;
72
73 __asm__ __volatile__(
74 "\n1: casa [%4] %%asi, %3, %1\n"
75 "2:\n"
76 " .section .fixup,#alloc,#execinstr\n"
77 " .align 4\n"
78 "3: sethi %%hi(2b), %0\n"
79 " jmpl %0 + %%lo(2b), %%g0\n"
80 " mov %5, %0\n"
81 " .previous\n"
82 " .section __ex_table,\"a\"\n"
83 " .align 4\n"
84 " .word 1b, 3b\n"
85 " .previous\n"
86 : "+r" (ret), "=r" (newval)
87 : "1" (newval), "r" (oldval), "r" (uaddr), "i" (-EFAULT)
88 : "memory");
89
90 *uval = newval;
91 return ret;
92 }
93
94 #endif /* !(_SPARC64_FUTEX_H) */
95
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