1 #ifndef _ASM_POWERPC_FUTEX_H
2 #define _ASM_POWERPC_FUTEX_H
6 #include <linux/futex.h>
7 #include <linux/uaccess.h>
10 #include <asm/asm-compat.h>
12 #define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \
13 __asm__ __volatile ( \
14 PPC_ATOMIC_ENTRY_BARRIER \
15 "1: lwarx %0,0,%2\n" \
18 "2: stwcx. %1,0,%2\n" \
20 PPC_ATOMIC_EXIT_BARRIER \
22 "3: .section .fixup,\"ax\"\n" \
28 : "=&r" (oldval), "=&r" (ret) \
29 : "b" (uaddr), "i" (-EFAULT), "r" (oparg) \
32 static inline int futex_atomic_op_inuser (int encoded_op, u32 __user *uaddr)
34 int op = (encoded_op >> 28) & 7;
35 int cmp = (encoded_op >> 24) & 15;
36 int oparg = (encoded_op << 8) >> 20;
37 int cmparg = (encoded_op << 20) >> 20;
39 if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
42 if (! access_ok (VERIFY_WRITE, uaddr, sizeof(u32)))
49 __futex_atomic_op("mr %1,%4\n", ret, oldval, uaddr, oparg);
52 __futex_atomic_op("add %1,%0,%4\n", ret, oldval, uaddr, oparg);
55 __futex_atomic_op("or %1,%0,%4\n", ret, oldval, uaddr, oparg);
58 __futex_atomic_op("andc %1,%0,%4\n", ret, oldval, uaddr, oparg);
61 __futex_atomic_op("xor %1,%0,%4\n", ret, oldval, uaddr, oparg);
71 case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
72 case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
73 case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
74 case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
75 case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
76 case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
77 default: ret = -ENOSYS;
84 futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
85 u32 oldval, u32 newval)
90 if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
93 __asm__ __volatile__ (
94 PPC_ATOMIC_ENTRY_BARRIER
95 "1: lwarx %1,0,%3 # futex_atomic_cmpxchg_inatomic\n\
101 PPC_ATOMIC_EXIT_BARRIER
102 "3: .section .fixup,\"ax\"\n\
108 : "+r" (ret), "=&r" (prev), "+m" (*uaddr)
109 : "r" (uaddr), "r" (oldval), "r" (newval), "i" (-EFAULT)
116 #endif /* __KERNEL__ */
117 #endif /* _ASM_POWERPC_FUTEX_H */