1 #ifndef _ASM_MICROBLAZE_FUTEX_H
2 #define _ASM_MICROBLAZE_FUTEX_H
6 #include <linux/futex.h>
7 #include <linux/uaccess.h>
10 #define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \
12 __asm__ __volatile__ ( \
13 "1: lwx %0, %2, r0; " \
19 .section .fixup,\"ax\"; \
23 .section __ex_table,\"a\"; \
26 : "=&r" (oldval), "=&r" (ret) \
27 : "r" (uaddr), "i" (-EFAULT), "r" (oparg) \
32 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("or %1,%4,%4;", ret, oldval, uaddr, oparg);
52 __futex_atomic_op("add %1,%0,%4;", ret, oldval, uaddr, oparg);
55 __futex_atomic_op("or %1,%0,%4;", ret, oldval, uaddr, oparg);
58 __futex_atomic_op("andn %1,%0,%4;", ret, oldval, uaddr, oparg);
61 __futex_atomic_op("xor %1,%0,%4;", ret, oldval, uaddr, oparg);
72 ret = (oldval == cmparg);
75 ret = (oldval != cmparg);
78 ret = (oldval < cmparg);
81 ret = (oldval >= cmparg);
84 ret = (oldval <= cmparg);
87 ret = (oldval > cmparg);
97 futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
98 u32 oldval, u32 newval)
103 if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
106 __asm__ __volatile__ ("1: lwx %1, %3, r0; \
113 .section .fixup,\"ax\"; \
117 .section __ex_table,\"a\"; \
120 : "+r" (ret), "=&r" (prev), "=&r"(cmp) \
121 : "r" (uaddr), "r" (oldval), "r" (newval), "i" (-EFAULT));
127 #endif /* __KERNEL__ */