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Jakub Jelinek4732efb2005-09-06 15:16:25 -07001#ifndef _ASM_FUTEX_H
2#define _ASM_FUTEX_H
3
Jakub Jelineka192dc12006-09-26 14:00:56 -07004#include <linux/futex.h>
Jeff Dike730f4122008-04-30 00:54:49 -07005#include <linux/uaccess.h>
Jakub Jelineka192dc12006-09-26 14:00:56 -07006#include <asm/errno.h>
7#include <asm/system.h>
Jakub Jelinek4732efb2005-09-06 15:16:25 -07008
Jakub Jelineka192dc12006-09-26 14:00:56 -07009#define __futex_atomic_op1(insn, ret, oldval, uaddr, oparg) \
10do { \
11 register unsigned long r8 __asm ("r8") = 0; \
12 __asm__ __volatile__( \
13 " mf;; \n" \
14 "[1:] " insn ";; \n" \
15 " .xdata4 \"__ex_table\", 1b-., 2f-. \n" \
16 "[2:]" \
17 : "+r" (r8), "=r" (oldval) \
18 : "r" (uaddr), "r" (oparg) \
19 : "memory"); \
20 ret = r8; \
21} while (0)
22
23#define __futex_atomic_op2(insn, ret, oldval, uaddr, oparg) \
24do { \
25 register unsigned long r8 __asm ("r8") = 0; \
26 int val, newval; \
27 do { \
28 __asm__ __volatile__( \
29 " mf;; \n" \
30 "[1:] ld4 %3=[%4];; \n" \
31 " mov %2=%3 \n" \
32 insn ";; \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" \
37 "[3:]" \
38 : "+r" (r8), "=r" (val), "=&r" (oldval), \
39 "=&r" (newval) \
40 : "r" (uaddr), "r" (oparg) \
41 : "memory"); \
42 if (unlikely (r8)) \
43 break; \
44 } while (unlikely (val != oldval)); \
45 ret = r8; \
46} while (0)
47
48static inline int
Michel Lespinasse8d7718a2011-03-10 18:50:58 -080049futex_atomic_op_inuser (int encoded_op, u32 __user *uaddr)
Jakub Jelineka192dc12006-09-26 14:00:56 -070050{
51 int op = (encoded_op >> 28) & 7;
52 int cmp = (encoded_op >> 24) & 15;
53 int oparg = (encoded_op << 8) >> 20;
54 int cmparg = (encoded_op << 20) >> 20;
55 int oldval = 0, ret;
56 if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
57 oparg = 1 << oparg;
58
Michel Lespinasse8d7718a2011-03-10 18:50:58 -080059 if (! access_ok (VERIFY_WRITE, uaddr, sizeof(u32)))
Jakub Jelineka192dc12006-09-26 14:00:56 -070060 return -EFAULT;
61
Peter Zijlstraa8663742006-12-06 20:32:20 -080062 pagefault_disable();
Jakub Jelineka192dc12006-09-26 14:00:56 -070063
64 switch (op) {
65 case FUTEX_OP_SET:
66 __futex_atomic_op1("xchg4 %1=[%2],%3", ret, oldval, uaddr,
67 oparg);
68 break;
69 case FUTEX_OP_ADD:
70 __futex_atomic_op2("add %3=%3,%5", ret, oldval, uaddr, oparg);
71 break;
72 case FUTEX_OP_OR:
73 __futex_atomic_op2("or %3=%3,%5", ret, oldval, uaddr, oparg);
74 break;
75 case FUTEX_OP_ANDN:
76 __futex_atomic_op2("and %3=%3,%5", ret, oldval, uaddr,
77 ~oparg);
78 break;
79 case FUTEX_OP_XOR:
80 __futex_atomic_op2("xor %3=%3,%5", ret, oldval, uaddr, oparg);
81 break;
82 default:
83 ret = -ENOSYS;
84 }
85
Peter Zijlstraa8663742006-12-06 20:32:20 -080086 pagefault_enable();
Jakub Jelineka192dc12006-09-26 14:00:56 -070087
88 if (!ret) {
89 switch (cmp) {
90 case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
91 case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
92 case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
93 case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
94 case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
95 case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
96 default: ret = -ENOSYS;
97 }
98 }
99 return ret;
100}
101
102static inline int
Michel Lespinasse8d7718a2011-03-10 18:50:58 -0800103futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
104 u32 oldval, u32 newval)
Jakub Jelineka192dc12006-09-26 14:00:56 -0700105{
Michel Lespinasse8d7718a2011-03-10 18:50:58 -0800106 if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
Jakub Jelineka192dc12006-09-26 14:00:56 -0700107 return -EFAULT;
108
109 {
Michel Lespinasse37a9d912011-03-10 18:48:51 -0800110 register unsigned long r8 __asm ("r8") = 0;
111 unsigned long prev;
Jakub Jelineka192dc12006-09-26 14:00:56 -0700112 __asm__ __volatile__(
113 " mf;; \n"
114 " mov ar.ccv=%3;; \n"
115 "[1:] cmpxchg4.acq %0=[%1],%2,ar.ccv \n"
116 " .xdata4 \"__ex_table\", 1b-., 2f-. \n"
117 "[2:]"
Michel Lespinasse37a9d912011-03-10 18:48:51 -0800118 : "=r" (prev)
Jakub Jelineka192dc12006-09-26 14:00:56 -0700119 : "r" (uaddr), "r" (newval),
120 "rO" ((long) (unsigned) oldval)
121 : "memory");
Michel Lespinasse37a9d912011-03-10 18:48:51 -0800122 *uval = prev;
Jakub Jelineka192dc12006-09-26 14:00:56 -0700123 return r8;
124 }
125}
126
127#endif /* _ASM_FUTEX_H */