1 #ifndef _ASM_S390_FUTEX_H
2 #define _ASM_S390_FUTEX_H
6 #include <linux/futex.h>
8 #include <asm/uaccess.h>
11 #define __futex_atomic_fixup \
12 ".section __ex_table,\"a\"\n" \
14 " .long 0b,4b,2b,4b,3b,4b\n" \
17 #define __futex_atomic_fixup \
18 ".section __ex_table,\"a\"\n" \
20 " .quad 0b,4b,2b,4b,3b,4b\n" \
22 #endif /* __s390x__ */
24 #define __futex_atomic_op(insn, ret, oldval, newval, uaddr, oparg) \
25 asm volatile(" sacf 256\n" \
28 "2: cs %1,%2,0(%6)\n" \
32 __futex_atomic_fixup \
33 : "=d" (ret), "=&d" (oldval), "=&d" (newval), \
35 : "0" (-EFAULT), "d" (oparg), "a" (uaddr), \
36 "m" (*uaddr) : "cc" );
38 static inline int futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
40 int op = (encoded_op >> 28) & 7;
41 int cmp = (encoded_op >> 24) & 15;
42 int oparg = (encoded_op << 8) >> 20;
43 int cmparg = (encoded_op << 20) >> 20;
44 int oldval = 0, newval, ret;
45 if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
48 if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int)))
55 __futex_atomic_op("lr %2,%5\n",
56 ret, oldval, newval, uaddr, oparg);
59 __futex_atomic_op("lr %2,%1\nar %2,%5\n",
60 ret, oldval, newval, uaddr, oparg);
63 __futex_atomic_op("lr %2,%1\nor %2,%5\n",
64 ret, oldval, newval, uaddr, oparg);
67 __futex_atomic_op("lr %2,%1\nnr %2,%5\n",
68 ret, oldval, newval, uaddr, oparg);
71 __futex_atomic_op("lr %2,%1\nxr %2,%5\n",
72 ret, oldval, newval, uaddr, oparg);
82 case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
83 case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
84 case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
85 case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
86 case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
87 case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
88 default: ret = -ENOSYS;
95 futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
99 if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int)))
101 asm volatile(" cs %1,%4,0(%5)\n"
105 ".section __ex_table,\"a\"\n"
109 #else /* __s390x__ */
110 ".section __ex_table,\"a\"\n"
114 #endif /* __s390x__ */
115 : "=d" (ret), "+d" (oldval), "=m" (*uaddr)
116 : "0" (-EFAULT), "d" (newval), "a" (uaddr), "m" (*uaddr)
121 #endif /* __KERNEL__ */
122 #endif /* _ASM_S390_FUTEX_H */