Commit | Line | Data |
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6c2a9e6d | 1 | /* |
6c2a9e6d GS |
2 | * Optimized user space space access functions based on mvcos. |
3 | * | |
a53c8fab | 4 | * Copyright IBM Corp. 2006 |
6c2a9e6d GS |
5 | * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), |
6 | * Gerald Schaefer (gerald.schaefer@de.ibm.com) | |
7 | */ | |
8 | ||
9 | #include <linux/errno.h> | |
10 | #include <linux/mm.h> | |
11 | #include <asm/uaccess.h> | |
12 | #include <asm/futex.h> | |
2b67fc46 | 13 | #include "uaccess.h" |
6c2a9e6d | 14 | |
f4815ac6 | 15 | #ifndef CONFIG_64BIT |
6c2a9e6d GS |
16 | #define AHI "ahi" |
17 | #define ALR "alr" | |
18 | #define CLR "clr" | |
19 | #define LHI "lhi" | |
20 | #define SLR "slr" | |
21 | #else | |
22 | #define AHI "aghi" | |
23 | #define ALR "algr" | |
24 | #define CLR "clgr" | |
25 | #define LHI "lghi" | |
26 | #define SLR "slgr" | |
27 | #endif | |
28 | ||
2b67fc46 | 29 | static size_t copy_from_user_mvcos(size_t size, const void __user *ptr, void *x) |
6c2a9e6d GS |
30 | { |
31 | register unsigned long reg0 asm("0") = 0x81UL; | |
32 | unsigned long tmp1, tmp2; | |
33 | ||
34 | tmp1 = -4096UL; | |
35 | asm volatile( | |
36 | "0: .insn ss,0xc80000000000,0(%0,%2),0(%1),0\n" | |
af9d2ff9 | 37 | "9: jz 7f\n" |
6c2a9e6d GS |
38 | "1:"ALR" %0,%3\n" |
39 | " "SLR" %1,%3\n" | |
40 | " "SLR" %2,%3\n" | |
41 | " j 0b\n" | |
42 | "2: la %4,4095(%1)\n"/* %4 = ptr + 4095 */ | |
43 | " nr %4,%3\n" /* %4 = (ptr + 4095) & -4096 */ | |
44 | " "SLR" %4,%1\n" | |
45 | " "CLR" %0,%4\n" /* copy crosses next page boundary? */ | |
52149ba6 | 46 | " jnh 4f\n" |
6c2a9e6d | 47 | "3: .insn ss,0xc80000000000,0(%4,%2),0(%1),0\n" |
af9d2ff9 | 48 | "10:"SLR" %0,%4\n" |
52149ba6 MS |
49 | " "ALR" %2,%4\n" |
50 | "4:"LHI" %4,-1\n" | |
51 | " "ALR" %4,%0\n" /* copy remaining size, subtract 1 */ | |
52 | " bras %3,6f\n" /* memset loop */ | |
53 | " xc 0(1,%2),0(%2)\n" | |
54 | "5: xc 0(256,%2),0(%2)\n" | |
55 | " la %2,256(%2)\n" | |
56 | "6:"AHI" %4,-256\n" | |
57 | " jnm 5b\n" | |
58 | " ex %4,0(%3)\n" | |
59 | " j 8f\n" | |
60 | "7:"SLR" %0,%0\n" | |
61 | "8: \n" | |
af9d2ff9 | 62 | EX_TABLE(0b,2b) EX_TABLE(3b,4b) EX_TABLE(9b,2b) EX_TABLE(10b,4b) |
6c2a9e6d GS |
63 | : "+a" (size), "+a" (ptr), "+a" (x), "+a" (tmp1), "=a" (tmp2) |
64 | : "d" (reg0) : "cc", "memory"); | |
65 | return size; | |
66 | } | |
67 | ||
2b67fc46 | 68 | static size_t copy_to_user_mvcos(size_t size, void __user *ptr, const void *x) |
6c2a9e6d GS |
69 | { |
70 | register unsigned long reg0 asm("0") = 0x810000UL; | |
71 | unsigned long tmp1, tmp2; | |
72 | ||
73 | tmp1 = -4096UL; | |
74 | asm volatile( | |
75 | "0: .insn ss,0xc80000000000,0(%0,%1),0(%2),0\n" | |
af9d2ff9 | 76 | "6: jz 4f\n" |
6c2a9e6d GS |
77 | "1:"ALR" %0,%3\n" |
78 | " "SLR" %1,%3\n" | |
79 | " "SLR" %2,%3\n" | |
80 | " j 0b\n" | |
81 | "2: la %4,4095(%1)\n"/* %4 = ptr + 4095 */ | |
82 | " nr %4,%3\n" /* %4 = (ptr + 4095) & -4096 */ | |
83 | " "SLR" %4,%1\n" | |
84 | " "CLR" %0,%4\n" /* copy crosses next page boundary? */ | |
85 | " jnh 5f\n" | |
86 | "3: .insn ss,0xc80000000000,0(%4,%1),0(%2),0\n" | |
af9d2ff9 | 87 | "7:"SLR" %0,%4\n" |
6c2a9e6d GS |
88 | " j 5f\n" |
89 | "4:"SLR" %0,%0\n" | |
90 | "5: \n" | |
af9d2ff9 | 91 | EX_TABLE(0b,2b) EX_TABLE(3b,5b) EX_TABLE(6b,2b) EX_TABLE(7b,5b) |
6c2a9e6d GS |
92 | : "+a" (size), "+a" (ptr), "+a" (x), "+a" (tmp1), "=a" (tmp2) |
93 | : "d" (reg0) : "cc", "memory"); | |
94 | return size; | |
95 | } | |
96 | ||
2b67fc46 HC |
97 | static size_t copy_in_user_mvcos(size_t size, void __user *to, |
98 | const void __user *from) | |
6c2a9e6d GS |
99 | { |
100 | register unsigned long reg0 asm("0") = 0x810081UL; | |
101 | unsigned long tmp1, tmp2; | |
102 | ||
103 | tmp1 = -4096UL; | |
104 | /* FIXME: copy with reduced length. */ | |
105 | asm volatile( | |
106 | "0: .insn ss,0xc80000000000,0(%0,%1),0(%2),0\n" | |
107 | " jz 2f\n" | |
108 | "1:"ALR" %0,%3\n" | |
109 | " "SLR" %1,%3\n" | |
110 | " "SLR" %2,%3\n" | |
111 | " j 0b\n" | |
112 | "2:"SLR" %0,%0\n" | |
113 | "3: \n" | |
114 | EX_TABLE(0b,3b) | |
115 | : "+a" (size), "+a" (to), "+a" (from), "+a" (tmp1), "=a" (tmp2) | |
116 | : "d" (reg0) : "cc", "memory"); | |
117 | return size; | |
118 | } | |
119 | ||
2b67fc46 | 120 | static size_t clear_user_mvcos(size_t size, void __user *to) |
6c2a9e6d GS |
121 | { |
122 | register unsigned long reg0 asm("0") = 0x810000UL; | |
123 | unsigned long tmp1, tmp2; | |
124 | ||
125 | tmp1 = -4096UL; | |
126 | asm volatile( | |
127 | "0: .insn ss,0xc80000000000,0(%0,%1),0(%4),0\n" | |
128 | " jz 4f\n" | |
129 | "1:"ALR" %0,%2\n" | |
130 | " "SLR" %1,%2\n" | |
131 | " j 0b\n" | |
132 | "2: la %3,4095(%1)\n"/* %4 = to + 4095 */ | |
133 | " nr %3,%2\n" /* %4 = (to + 4095) & -4096 */ | |
134 | " "SLR" %3,%1\n" | |
135 | " "CLR" %0,%3\n" /* copy crosses next page boundary? */ | |
136 | " jnh 5f\n" | |
137 | "3: .insn ss,0xc80000000000,0(%3,%1),0(%4),0\n" | |
138 | " "SLR" %0,%3\n" | |
139 | " j 5f\n" | |
140 | "4:"SLR" %0,%0\n" | |
141 | "5: \n" | |
142 | EX_TABLE(0b,2b) EX_TABLE(3b,5b) | |
143 | : "+a" (size), "+a" (to), "+a" (tmp1), "=a" (tmp2) | |
144 | : "a" (empty_zero_page), "d" (reg0) : "cc", "memory"); | |
145 | return size; | |
146 | } | |
147 | ||
c1821c2e GS |
148 | static size_t strnlen_user_mvcos(size_t count, const char __user *src) |
149 | { | |
d7b788cd | 150 | size_t done, len, offset, len_str; |
c1821c2e | 151 | char buf[256]; |
c1821c2e GS |
152 | |
153 | done = 0; | |
154 | do { | |
d7b788cd HC |
155 | offset = (size_t)src & ~PAGE_MASK; |
156 | len = min(256UL, PAGE_SIZE - offset); | |
157 | len = min(count - done, len); | |
158 | if (copy_from_user_mvcos(len, src, buf)) | |
c1821c2e | 159 | return 0; |
c1821c2e GS |
160 | len_str = strnlen(buf, len); |
161 | done += len_str; | |
d7b788cd | 162 | src += len_str; |
c1821c2e GS |
163 | } while ((len_str == len) && (done < count)); |
164 | return done + 1; | |
165 | } | |
166 | ||
167 | static size_t strncpy_from_user_mvcos(size_t count, const char __user *src, | |
168 | char *dst) | |
169 | { | |
d7b788cd | 170 | size_t done, len, offset, len_str; |
c1821c2e | 171 | |
f45655f6 HC |
172 | if (unlikely(!count)) |
173 | return 0; | |
c1821c2e GS |
174 | done = 0; |
175 | do { | |
d7b788cd HC |
176 | offset = (size_t)src & ~PAGE_MASK; |
177 | len = min(count - done, PAGE_SIZE - offset); | |
178 | if (copy_from_user_mvcos(len, src, dst)) | |
c1821c2e | 179 | return -EFAULT; |
c1821c2e GS |
180 | len_str = strnlen(dst, len); |
181 | done += len_str; | |
d7b788cd HC |
182 | src += len_str; |
183 | dst += len_str; | |
c1821c2e GS |
184 | } while ((len_str == len) && (done < count)); |
185 | return done; | |
186 | } | |
187 | ||
6c2a9e6d | 188 | struct uaccess_ops uaccess_mvcos = { |
c1821c2e | 189 | .copy_from_user = copy_from_user_mvcos, |
c1821c2e | 190 | .copy_to_user = copy_to_user_mvcos, |
c1821c2e GS |
191 | .copy_in_user = copy_in_user_mvcos, |
192 | .clear_user = clear_user_mvcos, | |
193 | .strnlen_user = strnlen_user_mvcos, | |
194 | .strncpy_from_user = strncpy_from_user_mvcos, | |
195 | .futex_atomic_op = futex_atomic_op_pt, | |
196 | .futex_atomic_cmpxchg = futex_atomic_cmpxchg_pt, | |
197 | }; |