1 #ifndef __ASM_SH_FUTEX_H
2 #define __ASM_SH_FUTEX_H
6 #include <linux/futex.h>
7 #include <linux/uaccess.h>
10 #if !defined(CONFIG_SMP)
11 #include <asm/futex-irq.h>
12 #elif defined(CONFIG_CPU_J2)
13 #include <asm/futex-cas.h>
14 #elif defined(CONFIG_CPU_SH4A)
15 #include <asm/futex-llsc.h>
17 #error SMP not supported on this configuration.
21 futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
22 u32 oldval, u32 newval)
24 if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
27 return atomic_futex_op_cmpxchg_inatomic(uval, uaddr, oldval, newval);
30 static inline int futex_atomic_op_inuser(int encoded_op, u32 __user *uaddr)
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;
39 if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
42 if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
48 if (op == FUTEX_OP_SET)
51 ret = get_user(oldval, uaddr);
60 newval = oldval + oparg;
63 newval = oldval | oparg;
66 newval = oldval & ~oparg;
69 newval = oldval ^ oparg;
78 ret = futex_atomic_cmpxchg_inatomic(&prev, uaddr, oldval, newval);
79 } while (!ret && prev != oldval);
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;
98 #endif /* __KERNEL__ */
99 #endif /* __ASM_SH_FUTEX_H */