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 ( \
15 "1: lwarx %0,0,%2\n" \
18 "2: stwcx. %1,0,%2\n" \
21 "3: .section .fixup,\"ax\"\n" \
25 ".section __ex_table,\"a\"\n" \
27 PPC_LONG "1b,4b,2b,4b\n" \
29 : "=&r" (oldval), "=&r" (ret) \
30 : "b" (uaddr), "i" (-EFAULT), "r" (oparg) \
33 static inline int futex_atomic_op_inuser (int encoded_op, u32 __user *uaddr)
35 int op = (encoded_op >> 28) & 7;
36 int cmp = (encoded_op >> 24) & 15;
37 int oparg = (encoded_op << 8) >> 20;
38 int cmparg = (encoded_op << 20) >> 20;
40 if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
43 if (! access_ok (VERIFY_WRITE, uaddr, sizeof(u32)))
50 __futex_atomic_op("mr %1,%4\n", ret, oldval, uaddr, oparg);
53 __futex_atomic_op("add %1,%0,%4\n", ret, oldval, uaddr, oparg);
56 __futex_atomic_op("or %1,%0,%4\n", ret, oldval, uaddr, oparg);
59 __futex_atomic_op("andc %1,%0,%4\n", ret, oldval, uaddr, oparg);
62 __futex_atomic_op("xor %1,%0,%4\n", ret, oldval, uaddr, oparg);
72 case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
73 case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
74 case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
75 case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
76 case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
77 case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
78 default: ret = -ENOSYS;
85 futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
86 u32 oldval, u32 newval)
91 if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
94 __asm__ __volatile__ (
96 "1: lwarx %1,0,%3 # futex_atomic_cmpxchg_inatomic\n\
100 "2: stwcx. %5,0,%3\n\
103 "3: .section .fixup,\"ax\"\n\
107 .section __ex_table,\"a\"\n\
109 " PPC_LONG "1b,4b,2b,4b\n\
111 : "+r" (ret), "=&r" (prev), "+m" (*uaddr)
112 : "r" (uaddr), "r" (oldval), "r" (newval), "i" (-EFAULT)
119 #endif /* __KERNEL__ */
120 #endif /* _ASM_POWERPC_FUTEX_H */