Gitiles
Code Review Sign In
review.evervolv.com / android_kernel_htc_msm8960 / 901b3d75e71535f29b64f352e94ff474d95df475 / . / arch / s390 / lib / uaccess_mvcos.c
blob: 86c96d6c191a3819bb094cb7d0698b3401a0c147 [file] [log] [blame]
Gerald Schaefer6c2a9e62006-09-20 15:59:44 +0200[diff] [blame]1/*
2 * arch/s390/lib/uaccess_mvcos.c
3 *
4 * Optimized user space space access functions based on mvcos.
5 *
6 * Copyright (C) IBM Corp. 2006
7 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
8 * Gerald Schaefer (gerald.schaefer@de.ibm.com)
9 */
10
11#include <linux/errno.h>
12#include <linux/mm.h>
13#include <asm/uaccess.h>
14#include <asm/futex.h>
15
16#ifndef __s390x__
17#define AHI "ahi"
18#define ALR "alr"
19#define CLR "clr"
20#define LHI "lhi"
21#define SLR "slr"
22#else
23#define AHI "aghi"
24#define ALR "algr"
25#define CLR "clgr"
26#define LHI "lghi"
27#define SLR "slgr"
28#endif
29
30size_t copy_from_user_mvcos(size_t size, const void __user *ptr, void *x)
31{
32 register unsigned long reg0 asm("0") = 0x81UL;
33 unsigned long tmp1, tmp2;
34
35 tmp1 = -4096UL;
36 asm volatile(
37 "0: .insn ss,0xc80000000000,0(%0,%2),0(%1),0\n"
38 " jz 4f\n"
39 "1:"ALR" %0,%3\n"
40 " "SLR" %1,%3\n"
41 " "SLR" %2,%3\n"
42 " j 0b\n"
43 "2: la %4,4095(%1)\n"/* %4 = ptr + 4095 */
44 " nr %4,%3\n" /* %4 = (ptr + 4095) & -4096 */
45 " "SLR" %4,%1\n"
46 " "CLR" %0,%4\n" /* copy crosses next page boundary? */
47 " jnh 5f\n"
48 "3: .insn ss,0xc80000000000,0(%4,%2),0(%1),0\n"
49 " "SLR" %0,%4\n"
50 " j 5f\n"
51 "4:"SLR" %0,%0\n"
52 "5: \n"
53 EX_TABLE(0b,2b) EX_TABLE(3b,5b)
54 : "+a" (size), "+a" (ptr), "+a" (x), "+a" (tmp1), "=a" (tmp2)
55 : "d" (reg0) : "cc", "memory");
56 return size;
57}
58
59size_t copy_to_user_mvcos(size_t size, void __user *ptr, const void *x)
60{
61 register unsigned long reg0 asm("0") = 0x810000UL;
62 unsigned long tmp1, tmp2;
63
64 tmp1 = -4096UL;
65 asm volatile(
66 "0: .insn ss,0xc80000000000,0(%0,%1),0(%2),0\n"
67 " jz 4f\n"
68 "1:"ALR" %0,%3\n"
69 " "SLR" %1,%3\n"
70 " "SLR" %2,%3\n"
71 " j 0b\n"
72 "2: la %4,4095(%1)\n"/* %4 = ptr + 4095 */
73 " nr %4,%3\n" /* %4 = (ptr + 4095) & -4096 */
74 " "SLR" %4,%1\n"
75 " "CLR" %0,%4\n" /* copy crosses next page boundary? */
76 " jnh 5f\n"
77 "3: .insn ss,0xc80000000000,0(%4,%1),0(%2),0\n"
78 " "SLR" %0,%4\n"
79 " j 5f\n"
80 "4:"SLR" %0,%0\n"
81 "5: \n"
82 EX_TABLE(0b,2b) EX_TABLE(3b,5b)
83 : "+a" (size), "+a" (ptr), "+a" (x), "+a" (tmp1), "=a" (tmp2)
84 : "d" (reg0) : "cc", "memory");
85 return size;
86}
87
88size_t copy_in_user_mvcos(size_t size, void __user *to, const void __user *from)
89{
90 register unsigned long reg0 asm("0") = 0x810081UL;
91 unsigned long tmp1, tmp2;
92
93 tmp1 = -4096UL;
94 /* FIXME: copy with reduced length. */
95 asm volatile(
96 "0: .insn ss,0xc80000000000,0(%0,%1),0(%2),0\n"
97 " jz 2f\n"
98 "1:"ALR" %0,%3\n"
99 " "SLR" %1,%3\n"
100 " "SLR" %2,%3\n"
101 " j 0b\n"
102 "2:"SLR" %0,%0\n"
103 "3: \n"
104 EX_TABLE(0b,3b)
105 : "+a" (size), "+a" (to), "+a" (from), "+a" (tmp1), "=a" (tmp2)
106 : "d" (reg0) : "cc", "memory");
107 return size;
108}
109
110size_t clear_user_mvcos(size_t size, void __user *to)
111{
112 register unsigned long reg0 asm("0") = 0x810000UL;
113 unsigned long tmp1, tmp2;
114
115 tmp1 = -4096UL;
116 asm volatile(
117 "0: .insn ss,0xc80000000000,0(%0,%1),0(%4),0\n"
118 " jz 4f\n"
119 "1:"ALR" %0,%2\n"
120 " "SLR" %1,%2\n"
121 " j 0b\n"
122 "2: la %3,4095(%1)\n"/* %4 = to + 4095 */
123 " nr %3,%2\n" /* %4 = (to + 4095) & -4096 */
124 " "SLR" %3,%1\n"
125 " "CLR" %0,%3\n" /* copy crosses next page boundary? */
126 " jnh 5f\n"
127 "3: .insn ss,0xc80000000000,0(%3,%1),0(%4),0\n"
128 " "SLR" %0,%3\n"
129 " j 5f\n"
130 "4:"SLR" %0,%0\n"
131 "5: \n"
132 EX_TABLE(0b,2b) EX_TABLE(3b,5b)
133 : "+a" (size), "+a" (to), "+a" (tmp1), "=a" (tmp2)
134 : "a" (empty_zero_page), "d" (reg0) : "cc", "memory");
135 return size;
136}
137
138extern size_t copy_from_user_std_small(size_t, const void __user *, void *);
139extern size_t copy_to_user_std_small(size_t, void __user *, const void *);
140extern size_t strnlen_user_std(size_t, const char __user *);
141extern size_t strncpy_from_user_std(size_t, const char __user *, char *);
142extern int futex_atomic_op(int, int __user *, int, int *);
143extern int futex_atomic_cmpxchg(int __user *, int, int);
144
145struct uaccess_ops uaccess_mvcos = {
146 .copy_from_user = copy_from_user_mvcos,
147 .copy_from_user_small = copy_from_user_std_small,
148 .copy_to_user = copy_to_user_mvcos,
149 .copy_to_user_small = copy_to_user_std_small,
150 .copy_in_user = copy_in_user_mvcos,
151 .clear_user = clear_user_mvcos,
152 .strnlen_user = strnlen_user_std,
153 .strncpy_from_user = strncpy_from_user_std,
154 .futex_atomic_op = futex_atomic_op,
155 .futex_atomic_cmpxchg = futex_atomic_cmpxchg,
156};