1#ifndef _SPARC64_FUTEX_H
2#define _SPARC64_FUTEX_H
3
4#include <linux/futex.h>
5#include <linux/uaccess.h>
6#include <asm/errno.h>
7
8#define __futex_cas_op(insn, ret, oldval, uaddr, oparg)	\
9	__asm__ __volatile__(				\
10	"\n1:	lduwa	[%3] %%asi, %2\n"		\
11	"	" insn "\n"				\
12	"2:	casa	[%3] %%asi, %2, %1\n"		\
13	"	cmp	%2, %1\n"			\
14	"	bne,pn	%%icc, 1b\n"			\
15	"	 mov	0, %0\n"			\
16	"3:\n"						\
17	"	.section .fixup,#alloc,#execinstr\n"	\
18	"	.align	4\n"				\
19	"4:	sethi	%%hi(3b), %0\n"			\
20	"	jmpl	%0 + %%lo(3b), %%g0\n"		\
21	"	 mov	%5, %0\n"			\
22	"	.previous\n"				\
23	"	.section __ex_table,\"a\"\n"		\
24	"	.align	4\n"				\
25	"	.word	1b, 4b\n"			\
26	"	.word	2b, 4b\n"			\
27	"	.previous\n"				\
28	: "=&r" (ret), "=&r" (oldval), "=&r" (tem)	\
29	: "r" (uaddr), "r" (oparg), "i" (-EFAULT)	\
30	: "memory")
31
32static inline int futex_atomic_op_inuser(int encoded_op, u32 __user *uaddr)
33{
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;
38	int oldval = 0, ret, tem;
39
40	if (unlikely(!access_ok(VERIFY_WRITE, uaddr, sizeof(u32))))
41		return -EFAULT;
42	if (unlikely((((unsigned long) uaddr) & 0x3UL)))
43		return -EINVAL;
44
45	if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
46		oparg = 1 << oparg;
47
48	pagefault_disable();
49
50	switch (op) {
51	case FUTEX_OP_SET:
52		__futex_cas_op("mov\t%4, %1", ret, oldval, uaddr, oparg);
53		break;
54	case FUTEX_OP_ADD:
55		__futex_cas_op("add\t%2, %4, %1", ret, oldval, uaddr, oparg);
56		break;
57	case FUTEX_OP_OR:
58		__futex_cas_op("or\t%2, %4, %1", ret, oldval, uaddr, oparg);
59		break;
60	case FUTEX_OP_ANDN:
61		__futex_cas_op("andn\t%2, %4, %1", ret, oldval, uaddr, oparg);
62		break;
63	case FUTEX_OP_XOR:
64		__futex_cas_op("xor\t%2, %4, %1", ret, oldval, uaddr, oparg);
65		break;
66	default:
67		ret = -ENOSYS;
68	}
69
70	pagefault_enable();
71
72	if (!ret) {
73		switch (cmp) {
74		case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
75		case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
76		case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
77		case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
78		case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
79		case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
80		default: ret = -ENOSYS;
81		}
82	}
83	return ret;
84}
85
86static inline int
87futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
88			      u32 oldval, u32 newval)
89{
90	int ret = 0;
91
92	__asm__ __volatile__(
93	"\n1:	casa	[%4] %%asi, %3, %1\n"
94	"2:\n"
95	"	.section .fixup,#alloc,#execinstr\n"
96	"	.align	4\n"
97	"3:	sethi	%%hi(2b), %0\n"
98	"	jmpl	%0 + %%lo(2b), %%g0\n"
99	"	mov	%5, %0\n"
100	"	.previous\n"
101	"	.section __ex_table,\"a\"\n"
102	"	.align	4\n"
103	"	.word	1b, 3b\n"
104	"	.previous\n"
105	: "+r" (ret), "=r" (newval)
106	: "1" (newval), "r" (oldval), "r" (uaddr), "i" (-EFAULT)
107	: "memory");
108
109	*uval = newval;
110	return ret;
111}
112
113#endif /* !(_SPARC64_FUTEX_H) */
114