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gerrit-public.fairphone.software / kernel / msm-4.9 / ce804bf598b59427a2c930e5c1f5fe2e51f1b517 / . / arch / sh / include / asm / futex.h
blob: d0078747d308cad1e98d28970f2593a2ef6ad752 [file] [log] [blame]
Kaz Kojimafc1d4c92007-06-18 13:58:32 +0900[diff] [blame]1#ifndef __ASM_SH_FUTEX_H
2#define __ASM_SH_FUTEX_H
Jakub Jelinek4732efb2005-09-06 15:16:25 -0700[diff] [blame]3
Kaz Kojimafc1d4c92007-06-18 13:58:32 +0900[diff] [blame]4#ifdef __KERNEL__
Jakub Jelinek4732efb2005-09-06 15:16:25 -0700[diff] [blame]5
Kaz Kojimafc1d4c92007-06-18 13:58:32 +0900[diff] [blame]6#include <linux/futex.h>
Jeff Dike730f4122008-04-30 00:54:49 -0700[diff] [blame]7#include <linux/uaccess.h>
Kaz Kojimafc1d4c92007-06-18 13:58:32 +0900[diff] [blame]8#include <asm/errno.h>
Kaz Kojimafc1d4c92007-06-18 13:58:32 +0900[diff] [blame]9
Rich Felker00b73d82016-04-25 21:58:03 +0000[diff] [blame]10#if !defined(CONFIG_SMP)
Kaz Kojimafc1d4c92007-06-18 13:58:32 +0900[diff] [blame]11#include <asm/futex-irq.h>
Rich Felker00b73d82016-04-25 21:58:03 +0000[diff] [blame]12#elif defined(CONFIG_CPU_J2)
13#include <asm/futex-cas.h>
14#elif defined(CONFIG_CPU_SH4A)
15#include <asm/futex-llsc.h>
16#else
17#error SMP not supported on this configuration.
18#endif
Kaz Kojimafc1d4c92007-06-18 13:58:32 +0900[diff] [blame]19
20static inline int
Michel Lespinasse8d7718a2011-03-10 18:50:58 -0800[diff] [blame]21futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
22 u32 oldval, u32 newval)
Kaz Kojimafc1d4c92007-06-18 13:58:32 +0900[diff] [blame]23{
Michel Lespinasse8d7718a2011-03-10 18:50:58 -0800[diff] [blame]24 if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
Kaz Kojimafc1d4c92007-06-18 13:58:32 +0900[diff] [blame]25 return -EFAULT;
26
Michel Lespinasse37a9d912011-03-10 18:48:51 -0800[diff] [blame]27 return atomic_futex_op_cmpxchg_inatomic(uval, uaddr, oldval, newval);
Kaz Kojimafc1d4c92007-06-18 13:58:32 +0900[diff] [blame]28}
29
Rich Felker00b73d82016-04-25 21:58:03 +0000[diff] [blame]30static inline int futex_atomic_op_inuser(int encoded_op, u32 __user *uaddr)
31{
32 int op = (encoded_op >> 28) & 7;
33 int cmp = (encoded_op >> 24) & 15;
34 u32 oparg = (encoded_op << 8) >> 20;
35 u32 cmparg = (encoded_op << 20) >> 20;
36 u32 oldval, newval, prev;
37 int ret;
38
39 if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
40 oparg = 1 << oparg;
41
42 if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
43 return -EFAULT;
44
45 pagefault_disable();
46
47 do {
48 if (op == FUTEX_OP_SET)
49 ret = oldval = 0;
50 else
51 ret = get_user(oldval, uaddr);
52
53 if (ret) break;
54
55 switch (op) {
56 case FUTEX_OP_SET:
57 newval = oparg;
58 break;
59 case FUTEX_OP_ADD:
60 newval = oldval + oparg;
61 break;
62 case FUTEX_OP_OR:
63 newval = oldval | oparg;
64 break;
65 case FUTEX_OP_ANDN:
66 newval = oldval & ~oparg;
67 break;
68 case FUTEX_OP_XOR:
69 newval = oldval ^ oparg;
70 break;
71 default:
72 ret = -ENOSYS;
73 break;
74 }
75
76 if (ret) break;
77
78 ret = futex_atomic_cmpxchg_inatomic(&prev, uaddr, oldval, newval);
79 } while (!ret && prev != oldval);
80
81 pagefault_enable();
82
83 if (!ret) {
84 switch (cmp) {
85 case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
86 case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
87 case FUTEX_OP_CMP_LT: ret = ((int)oldval < (int)cmparg); break;
88 case FUTEX_OP_CMP_GE: ret = ((int)oldval >= (int)cmparg); break;
89 case FUTEX_OP_CMP_LE: ret = ((int)oldval <= (int)cmparg); break;
90 case FUTEX_OP_CMP_GT: ret = ((int)oldval > (int)cmparg); break;
91 default: ret = -ENOSYS;
92 }
93 }
94
95 return ret;
96}
97
Kaz Kojimafc1d4c92007-06-18 13:58:32 +0900[diff] [blame]98#endif /* __KERNEL__ */
99#endif /* __ASM_SH_FUTEX_H */