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d02765d1 GS |
1 | /* |
2 | * arch/s390/lib/uaccess_std.c | |
3 | * | |
4 | * Standard user space access functions based on mvcp/mvcs and doing | |
5 | * interesting things in the secondary space mode. | |
6 | * | |
7 | * Copyright (C) IBM Corp. 2006 | |
8 | * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), | |
9 | * Gerald Schaefer (gerald.schaefer@de.ibm.com) | |
10 | */ | |
11 | ||
12 | #include <linux/errno.h> | |
13 | #include <linux/mm.h> | |
a866374a | 14 | #include <linux/uaccess.h> |
d02765d1 | 15 | #include <asm/futex.h> |
2b67fc46 | 16 | #include "uaccess.h" |
d02765d1 GS |
17 | |
18 | #ifndef __s390x__ | |
19 | #define AHI "ahi" | |
20 | #define ALR "alr" | |
21 | #define CLR "clr" | |
22 | #define LHI "lhi" | |
23 | #define SLR "slr" | |
24 | #else | |
25 | #define AHI "aghi" | |
26 | #define ALR "algr" | |
27 | #define CLR "clgr" | |
28 | #define LHI "lghi" | |
29 | #define SLR "slgr" | |
30 | #endif | |
31 | ||
32 | size_t copy_from_user_std(size_t size, const void __user *ptr, void *x) | |
33 | { | |
34 | unsigned long tmp1, tmp2; | |
35 | ||
36 | tmp1 = -256UL; | |
37 | asm volatile( | |
38 | "0: mvcp 0(%0,%2),0(%1),%3\n" | |
52149ba6 | 39 | " jz 8f\n" |
d02765d1 GS |
40 | "1:"ALR" %0,%3\n" |
41 | " la %1,256(%1)\n" | |
42 | " la %2,256(%2)\n" | |
43 | "2: mvcp 0(%0,%2),0(%1),%3\n" | |
44 | " jnz 1b\n" | |
52149ba6 | 45 | " j 8f\n" |
d02765d1 GS |
46 | "3: la %4,255(%1)\n" /* %4 = ptr + 255 */ |
47 | " "LHI" %3,-4096\n" | |
48 | " nr %4,%3\n" /* %4 = (ptr + 255) & -4096 */ | |
49 | " "SLR" %4,%1\n" | |
50 | " "CLR" %0,%4\n" /* copy crosses next page boundary? */ | |
52149ba6 | 51 | " jnh 5f\n" |
d02765d1 GS |
52 | "4: mvcp 0(%4,%2),0(%1),%3\n" |
53 | " "SLR" %0,%4\n" | |
52149ba6 MS |
54 | " "ALR" %2,%4\n" |
55 | "5:"LHI" %4,-1\n" | |
56 | " "ALR" %4,%0\n" /* copy remaining size, subtract 1 */ | |
57 | " bras %3,7f\n" /* memset loop */ | |
58 | " xc 0(1,%2),0(%2)\n" | |
59 | "6: xc 0(256,%2),0(%2)\n" | |
60 | " la %2,256(%2)\n" | |
61 | "7:"AHI" %4,-256\n" | |
62 | " jnm 6b\n" | |
63 | " ex %4,0(%3)\n" | |
64 | " j 9f\n" | |
65 | "8:"SLR" %0,%0\n" | |
66 | "9: \n" | |
67 | EX_TABLE(0b,3b) EX_TABLE(2b,3b) EX_TABLE(4b,5b) | |
d02765d1 GS |
68 | : "+a" (size), "+a" (ptr), "+a" (x), "+a" (tmp1), "=a" (tmp2) |
69 | : : "cc", "memory"); | |
70 | return size; | |
71 | } | |
72 | ||
2b67fc46 HC |
73 | static size_t copy_from_user_std_check(size_t size, const void __user *ptr, |
74 | void *x) | |
d02765d1 | 75 | { |
59f35d53 GS |
76 | if (size <= 1024) |
77 | return copy_from_user_std(size, ptr, x); | |
78 | return copy_from_user_pt(size, ptr, x); | |
d02765d1 GS |
79 | } |
80 | ||
81 | size_t copy_to_user_std(size_t size, void __user *ptr, const void *x) | |
82 | { | |
83 | unsigned long tmp1, tmp2; | |
84 | ||
85 | tmp1 = -256UL; | |
86 | asm volatile( | |
87 | "0: mvcs 0(%0,%1),0(%2),%3\n" | |
88 | " jz 5f\n" | |
89 | "1:"ALR" %0,%3\n" | |
90 | " la %1,256(%1)\n" | |
91 | " la %2,256(%2)\n" | |
92 | "2: mvcs 0(%0,%1),0(%2),%3\n" | |
93 | " jnz 1b\n" | |
94 | " j 5f\n" | |
95 | "3: la %4,255(%1)\n" /* %4 = ptr + 255 */ | |
96 | " "LHI" %3,-4096\n" | |
97 | " nr %4,%3\n" /* %4 = (ptr + 255) & -4096 */ | |
98 | " "SLR" %4,%1\n" | |
99 | " "CLR" %0,%4\n" /* copy crosses next page boundary? */ | |
100 | " jnh 6f\n" | |
101 | "4: mvcs 0(%4,%1),0(%2),%3\n" | |
102 | " "SLR" %0,%4\n" | |
103 | " j 6f\n" | |
104 | "5:"SLR" %0,%0\n" | |
105 | "6: \n" | |
106 | EX_TABLE(0b,3b) EX_TABLE(2b,3b) EX_TABLE(4b,6b) | |
107 | : "+a" (size), "+a" (ptr), "+a" (x), "+a" (tmp1), "=a" (tmp2) | |
108 | : : "cc", "memory"); | |
109 | return size; | |
110 | } | |
111 | ||
2b67fc46 HC |
112 | static size_t copy_to_user_std_check(size_t size, void __user *ptr, |
113 | const void *x) | |
d02765d1 | 114 | { |
59f35d53 GS |
115 | if (size <= 1024) |
116 | return copy_to_user_std(size, ptr, x); | |
117 | return copy_to_user_pt(size, ptr, x); | |
d02765d1 GS |
118 | } |
119 | ||
2b67fc46 HC |
120 | static size_t copy_in_user_std(size_t size, void __user *to, |
121 | const void __user *from) | |
d02765d1 GS |
122 | { |
123 | unsigned long tmp1; | |
124 | ||
125 | asm volatile( | |
126 | " "AHI" %0,-1\n" | |
127 | " jo 5f\n" | |
128 | " sacf 256\n" | |
129 | " bras %3,3f\n" | |
130 | "0:"AHI" %0,257\n" | |
131 | "1: mvc 0(1,%1),0(%2)\n" | |
132 | " la %1,1(%1)\n" | |
133 | " la %2,1(%2)\n" | |
134 | " "AHI" %0,-1\n" | |
135 | " jnz 1b\n" | |
136 | " j 5f\n" | |
137 | "2: mvc 0(256,%1),0(%2)\n" | |
138 | " la %1,256(%1)\n" | |
139 | " la %2,256(%2)\n" | |
140 | "3:"AHI" %0,-256\n" | |
141 | " jnm 2b\n" | |
142 | "4: ex %0,1b-0b(%3)\n" | |
143 | " sacf 0\n" | |
144 | "5: "SLR" %0,%0\n" | |
145 | "6:\n" | |
146 | EX_TABLE(1b,6b) EX_TABLE(2b,0b) EX_TABLE(4b,0b) | |
147 | : "+a" (size), "+a" (to), "+a" (from), "=a" (tmp1) | |
148 | : : "cc", "memory"); | |
149 | return size; | |
150 | } | |
151 | ||
2b67fc46 | 152 | static size_t clear_user_std(size_t size, void __user *to) |
d02765d1 GS |
153 | { |
154 | unsigned long tmp1, tmp2; | |
155 | ||
156 | asm volatile( | |
157 | " "AHI" %0,-1\n" | |
158 | " jo 5f\n" | |
159 | " sacf 256\n" | |
160 | " bras %3,3f\n" | |
161 | " xc 0(1,%1),0(%1)\n" | |
162 | "0:"AHI" %0,257\n" | |
163 | " la %2,255(%1)\n" /* %2 = ptr + 255 */ | |
164 | " srl %2,12\n" | |
165 | " sll %2,12\n" /* %2 = (ptr + 255) & -4096 */ | |
166 | " "SLR" %2,%1\n" | |
167 | " "CLR" %0,%2\n" /* clear crosses next page boundary? */ | |
168 | " jnh 5f\n" | |
169 | " "AHI" %2,-1\n" | |
170 | "1: ex %2,0(%3)\n" | |
171 | " "AHI" %2,1\n" | |
172 | " "SLR" %0,%2\n" | |
173 | " j 5f\n" | |
174 | "2: xc 0(256,%1),0(%1)\n" | |
175 | " la %1,256(%1)\n" | |
176 | "3:"AHI" %0,-256\n" | |
177 | " jnm 2b\n" | |
178 | "4: ex %0,0(%3)\n" | |
179 | " sacf 0\n" | |
180 | "5: "SLR" %0,%0\n" | |
181 | "6:\n" | |
182 | EX_TABLE(1b,6b) EX_TABLE(2b,0b) EX_TABLE(4b,0b) | |
183 | : "+a" (size), "+a" (to), "=a" (tmp1), "=a" (tmp2) | |
184 | : : "cc", "memory"); | |
185 | return size; | |
186 | } | |
187 | ||
188 | size_t strnlen_user_std(size_t size, const char __user *src) | |
189 | { | |
190 | register unsigned long reg0 asm("0") = 0UL; | |
191 | unsigned long tmp1, tmp2; | |
192 | ||
193 | asm volatile( | |
194 | " la %2,0(%1)\n" | |
195 | " la %3,0(%0,%1)\n" | |
196 | " "SLR" %0,%0\n" | |
197 | " sacf 256\n" | |
198 | "0: srst %3,%2\n" | |
199 | " jo 0b\n" | |
200 | " la %0,1(%3)\n" /* strnlen_user results includes \0 */ | |
201 | " "SLR" %0,%1\n" | |
202 | "1: sacf 0\n" | |
203 | EX_TABLE(0b,1b) | |
204 | : "+a" (size), "+a" (src), "=a" (tmp1), "=a" (tmp2) | |
205 | : "d" (reg0) : "cc", "memory"); | |
206 | return size; | |
207 | } | |
208 | ||
209 | size_t strncpy_from_user_std(size_t size, const char __user *src, char *dst) | |
210 | { | |
211 | register unsigned long reg0 asm("0") = 0UL; | |
212 | unsigned long tmp1, tmp2; | |
213 | ||
214 | asm volatile( | |
215 | " la %3,0(%1)\n" | |
216 | " la %4,0(%0,%1)\n" | |
217 | " sacf 256\n" | |
218 | "0: srst %4,%3\n" | |
219 | " jo 0b\n" | |
220 | " sacf 0\n" | |
221 | " la %0,0(%4)\n" | |
222 | " jh 1f\n" /* found \0 in string ? */ | |
223 | " "AHI" %4,1\n" /* include \0 in copy */ | |
224 | "1:"SLR" %0,%1\n" /* %0 = return length (without \0) */ | |
225 | " "SLR" %4,%1\n" /* %4 = copy length (including \0) */ | |
226 | "2: mvcp 0(%4,%2),0(%1),%5\n" | |
227 | " jz 9f\n" | |
228 | "3:"AHI" %4,-256\n" | |
229 | " la %1,256(%1)\n" | |
230 | " la %2,256(%2)\n" | |
231 | "4: mvcp 0(%4,%2),0(%1),%5\n" | |
232 | " jnz 3b\n" | |
233 | " j 9f\n" | |
234 | "7: sacf 0\n" | |
235 | "8:"LHI" %0,%6\n" | |
236 | "9:\n" | |
237 | EX_TABLE(0b,7b) EX_TABLE(2b,8b) EX_TABLE(4b,8b) | |
238 | : "+a" (size), "+a" (src), "+d" (dst), "=a" (tmp1), "=a" (tmp2) | |
239 | : "d" (reg0), "K" (-EFAULT) : "cc", "memory"); | |
240 | return size; | |
241 | } | |
242 | ||
243 | #define __futex_atomic_op(insn, ret, oldval, newval, uaddr, oparg) \ | |
244 | asm volatile( \ | |
245 | " sacf 256\n" \ | |
246 | "0: l %1,0(%6)\n" \ | |
247 | "1:"insn \ | |
248 | "2: cs %1,%2,0(%6)\n" \ | |
249 | "3: jl 1b\n" \ | |
250 | " lhi %0,0\n" \ | |
251 | "4: sacf 0\n" \ | |
252 | EX_TABLE(0b,4b) EX_TABLE(2b,4b) EX_TABLE(3b,4b) \ | |
253 | : "=d" (ret), "=&d" (oldval), "=&d" (newval), \ | |
254 | "=m" (*uaddr) \ | |
255 | : "0" (-EFAULT), "d" (oparg), "a" (uaddr), \ | |
256 | "m" (*uaddr) : "cc"); | |
257 | ||
2b67fc46 | 258 | int futex_atomic_op_std(int op, int __user *uaddr, int oparg, int *old) |
d02765d1 GS |
259 | { |
260 | int oldval = 0, newval, ret; | |
261 | ||
d02765d1 GS |
262 | switch (op) { |
263 | case FUTEX_OP_SET: | |
264 | __futex_atomic_op("lr %2,%5\n", | |
265 | ret, oldval, newval, uaddr, oparg); | |
266 | break; | |
267 | case FUTEX_OP_ADD: | |
268 | __futex_atomic_op("lr %2,%1\nar %2,%5\n", | |
269 | ret, oldval, newval, uaddr, oparg); | |
270 | break; | |
271 | case FUTEX_OP_OR: | |
272 | __futex_atomic_op("lr %2,%1\nor %2,%5\n", | |
273 | ret, oldval, newval, uaddr, oparg); | |
274 | break; | |
275 | case FUTEX_OP_ANDN: | |
276 | __futex_atomic_op("lr %2,%1\nnr %2,%5\n", | |
277 | ret, oldval, newval, uaddr, oparg); | |
278 | break; | |
279 | case FUTEX_OP_XOR: | |
280 | __futex_atomic_op("lr %2,%1\nxr %2,%5\n", | |
281 | ret, oldval, newval, uaddr, oparg); | |
282 | break; | |
283 | default: | |
284 | ret = -ENOSYS; | |
285 | } | |
d02765d1 GS |
286 | *old = oldval; |
287 | return ret; | |
288 | } | |
289 | ||
2b67fc46 | 290 | int futex_atomic_cmpxchg_std(int __user *uaddr, int oldval, int newval) |
d02765d1 GS |
291 | { |
292 | int ret; | |
293 | ||
294 | asm volatile( | |
295 | " sacf 256\n" | |
296 | " cs %1,%4,0(%5)\n" | |
297 | "0: lr %0,%1\n" | |
298 | "1: sacf 0\n" | |
299 | EX_TABLE(0b,1b) | |
300 | : "=d" (ret), "+d" (oldval), "=m" (*uaddr) | |
301 | : "0" (-EFAULT), "d" (newval), "a" (uaddr), "m" (*uaddr) | |
302 | : "cc", "memory" ); | |
303 | return ret; | |
304 | } | |
305 | ||
306 | struct uaccess_ops uaccess_std = { | |
59f35d53 GS |
307 | .copy_from_user = copy_from_user_std_check, |
308 | .copy_from_user_small = copy_from_user_std, | |
309 | .copy_to_user = copy_to_user_std_check, | |
310 | .copy_to_user_small = copy_to_user_std, | |
d02765d1 GS |
311 | .copy_in_user = copy_in_user_std, |
312 | .clear_user = clear_user_std, | |
313 | .strnlen_user = strnlen_user_std, | |
314 | .strncpy_from_user = strncpy_from_user_std, | |
2b67fc46 HC |
315 | .futex_atomic_op = futex_atomic_op_std, |
316 | .futex_atomic_cmpxchg = futex_atomic_cmpxchg_std, | |
d02765d1 | 317 | }; |