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" \
26 ".section __ex_table,\"a\"\n" \
28 PPC_LONG "1b,4b,2b,4b\n" \
30 : "=&r" (oldval), "=&r" (ret) \
31 : "b" (uaddr), "i" (-EFAULT), "r" (oparg) \
34 static inline int futex_atomic_op_inuser (int encoded_op, u32 __user *uaddr)
36 int op = (encoded_op >> 28) & 7;
37 int cmp = (encoded_op >> 24) & 15;
38 int oparg = (encoded_op << 8) >> 20;
39 int cmparg = (encoded_op << 20) >> 20;
41 if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
44 if (! access_ok (VERIFY_WRITE, uaddr, sizeof(u32)))
51 __futex_atomic_op("mr %1,%4\n", ret, oldval, uaddr, oparg);
54 __futex_atomic_op("add %1,%0,%4\n", ret, oldval, uaddr, oparg);
57 __futex_atomic_op("or %1,%0,%4\n", ret, oldval, uaddr, oparg);
60 __futex_atomic_op("andc %1,%0,%4\n", ret, oldval, uaddr, oparg);
63 __futex_atomic_op("xor %1,%0,%4\n", ret, oldval, uaddr, oparg);
73 case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
74 case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
75 case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
76 case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
77 case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
78 case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
79 default: ret = -ENOSYS;
86 futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
87 u32 oldval, u32 newval)
92 if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
95 __asm__ __volatile__ (
96 PPC_ATOMIC_ENTRY_BARRIER
97 "1: lwarx %1,0,%3 # futex_atomic_cmpxchg_inatomic\n\
101 "2: stwcx. %5,0,%3\n\
103 PPC_ATOMIC_EXIT_BARRIER
104 "3: .section .fixup,\"ax\"\n\
108 .section __ex_table,\"a\"\n\
110 " PPC_LONG "1b,4b,2b,4b\n\
112 : "+r" (ret), "=&r" (prev), "+m" (*uaddr)
113 : "r" (uaddr), "r" (oldval), "r" (newval), "i" (-EFAULT)
120 #endif /* __KERNEL__ */
121 #endif /* _ASM_POWERPC_FUTEX_H */