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-rw-r--r--arch/s390/lib/uaccess_std.c340
1 files changed, 340 insertions, 0 deletions
diff --git a/arch/s390/lib/uaccess_std.c b/arch/s390/lib/uaccess_std.c
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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>
14#include <asm/uaccess.h>
15#include <asm/futex.h>
16
17#ifndef __s390x__
18#define AHI "ahi"
19#define ALR "alr"
20#define CLR "clr"
21#define LHI "lhi"
22#define SLR "slr"
23#else
24#define AHI "aghi"
25#define ALR "algr"
26#define CLR "clgr"
27#define LHI "lghi"
28#define SLR "slgr"
29#endif
30
31size_t copy_from_user_std(size_t size, const void __user *ptr, void *x)
32{
33 unsigned long tmp1, tmp2;
34
35 tmp1 = -256UL;
36 asm volatile(
37 "0: mvcp 0(%0,%2),0(%1),%3\n"
38 " jz 5f\n"
39 "1:"ALR" %0,%3\n"
40 " la %1,256(%1)\n"
41 " la %2,256(%2)\n"
42 "2: mvcp 0(%0,%2),0(%1),%3\n"
43 " jnz 1b\n"
44 " j 5f\n"
45 "3: la %4,255(%1)\n" /* %4 = ptr + 255 */
46 " "LHI" %3,-4096\n"
47 " nr %4,%3\n" /* %4 = (ptr + 255) & -4096 */
48 " "SLR" %4,%1\n"
49 " "CLR" %0,%4\n" /* copy crosses next page boundary? */
50 " jnh 6f\n"
51 "4: mvcp 0(%4,%2),0(%1),%3\n"
52 " "SLR" %0,%4\n"
53 " j 6f\n"
54 "5:"SLR" %0,%0\n"
55 "6: \n"
56 EX_TABLE(0b,3b) EX_TABLE(2b,3b) EX_TABLE(4b,6b)
57 : "+a" (size), "+a" (ptr), "+a" (x), "+a" (tmp1), "=a" (tmp2)
58 : : "cc", "memory");
59 return size;
60}
61
62size_t copy_from_user_std_small(size_t size, const void __user *ptr, void *x)
63{
64 unsigned long tmp1, tmp2;
65
66 tmp1 = 0UL;
67 asm volatile(
68 "0: mvcp 0(%0,%2),0(%1),%3\n"
69 " "SLR" %0,%0\n"
70 " j 3f\n"
71 "1: la %4,255(%1)\n" /* %4 = ptr + 255 */
72 " "LHI" %3,-4096\n"
73 " nr %4,%3\n" /* %4 = (ptr + 255) & -4096 */
74 " "SLR" %4,%1\n"
75 " "CLR" %0,%4\n" /* copy crosses next page boundary? */
76 " jnh 3f\n"
77 "2: mvcp 0(%4,%2),0(%1),%3\n"
78 " "SLR" %0,%4\n"
79 "3:\n"
80 EX_TABLE(0b,1b) EX_TABLE(2b,3b)
81 : "+a" (size), "+a" (ptr), "+a" (x), "+a" (tmp1), "=a" (tmp2)
82 : : "cc", "memory");
83 return size;
84}
85
86size_t copy_to_user_std(size_t size, void __user *ptr, const void *x)
87{
88 unsigned long tmp1, tmp2;
89
90 tmp1 = -256UL;
91 asm volatile(
92 "0: mvcs 0(%0,%1),0(%2),%3\n"
93 " jz 5f\n"
94 "1:"ALR" %0,%3\n"
95 " la %1,256(%1)\n"
96 " la %2,256(%2)\n"
97 "2: mvcs 0(%0,%1),0(%2),%3\n"
98 " jnz 1b\n"
99 " j 5f\n"
100 "3: la %4,255(%1)\n" /* %4 = ptr + 255 */
101 " "LHI" %3,-4096\n"
102 " nr %4,%3\n" /* %4 = (ptr + 255) & -4096 */
103 " "SLR" %4,%1\n"
104 " "CLR" %0,%4\n" /* copy crosses next page boundary? */
105 " jnh 6f\n"
106 "4: mvcs 0(%4,%1),0(%2),%3\n"
107 " "SLR" %0,%4\n"
108 " j 6f\n"
109 "5:"SLR" %0,%0\n"
110 "6: \n"
111 EX_TABLE(0b,3b) EX_TABLE(2b,3b) EX_TABLE(4b,6b)
112 : "+a" (size), "+a" (ptr), "+a" (x), "+a" (tmp1), "=a" (tmp2)
113 : : "cc", "memory");
114 return size;
115}
116
117size_t copy_to_user_std_small(size_t size, void __user *ptr, const void *x)
118{
119 unsigned long tmp1, tmp2;
120
121 tmp1 = 0UL;
122 asm volatile(
123 "0: mvcs 0(%0,%1),0(%2),%3\n"
124 " "SLR" %0,%0\n"
125 " j 3f\n"
126 "1: la %4,255(%1)\n" /* ptr + 255 */
127 " "LHI" %3,-4096\n"
128 " nr %4,%3\n" /* (ptr + 255) & -4096UL */
129 " "SLR" %4,%1\n"
130 " "CLR" %0,%4\n" /* copy crosses next page boundary? */
131 " jnh 3f\n"
132 "2: mvcs 0(%4,%1),0(%2),%3\n"
133 " "SLR" %0,%4\n"
134 "3:\n"
135 EX_TABLE(0b,1b) EX_TABLE(2b,3b)
136 : "+a" (size), "+a" (ptr), "+a" (x), "+a" (tmp1), "=a" (tmp2)
137 : : "cc", "memory");
138 return size;
139}
140
141size_t copy_in_user_std(size_t size, void __user *to, const void __user *from)
142{
143 unsigned long tmp1;
144
145 asm volatile(
146 " "AHI" %0,-1\n"
147 " jo 5f\n"
148 " sacf 256\n"
149 " bras %3,3f\n"
150 "0:"AHI" %0,257\n"
151 "1: mvc 0(1,%1),0(%2)\n"
152 " la %1,1(%1)\n"
153 " la %2,1(%2)\n"
154 " "AHI" %0,-1\n"
155 " jnz 1b\n"
156 " j 5f\n"
157 "2: mvc 0(256,%1),0(%2)\n"
158 " la %1,256(%1)\n"
159 " la %2,256(%2)\n"
160 "3:"AHI" %0,-256\n"
161 " jnm 2b\n"
162 "4: ex %0,1b-0b(%3)\n"
163 " sacf 0\n"
164 "5: "SLR" %0,%0\n"
165 "6:\n"
166 EX_TABLE(1b,6b) EX_TABLE(2b,0b) EX_TABLE(4b,0b)
167 : "+a" (size), "+a" (to), "+a" (from), "=a" (tmp1)
168 : : "cc", "memory");
169 return size;
170}
171
172size_t clear_user_std(size_t size, void __user *to)
173{
174 unsigned long tmp1, tmp2;
175
176 asm volatile(
177 " "AHI" %0,-1\n"
178 " jo 5f\n"
179 " sacf 256\n"
180 " bras %3,3f\n"
181 " xc 0(1,%1),0(%1)\n"
182 "0:"AHI" %0,257\n"
183 " la %2,255(%1)\n" /* %2 = ptr + 255 */
184 " srl %2,12\n"
185 " sll %2,12\n" /* %2 = (ptr + 255) & -4096 */
186 " "SLR" %2,%1\n"
187 " "CLR" %0,%2\n" /* clear crosses next page boundary? */
188 " jnh 5f\n"
189 " "AHI" %2,-1\n"
190 "1: ex %2,0(%3)\n"
191 " "AHI" %2,1\n"
192 " "SLR" %0,%2\n"
193 " j 5f\n"
194 "2: xc 0(256,%1),0(%1)\n"
195 " la %1,256(%1)\n"
196 "3:"AHI" %0,-256\n"
197 " jnm 2b\n"
198 "4: ex %0,0(%3)\n"
199 " sacf 0\n"
200 "5: "SLR" %0,%0\n"
201 "6:\n"
202 EX_TABLE(1b,6b) EX_TABLE(2b,0b) EX_TABLE(4b,0b)
203 : "+a" (size), "+a" (to), "=a" (tmp1), "=a" (tmp2)
204 : : "cc", "memory");
205 return size;
206}
207
208size_t strnlen_user_std(size_t size, const char __user *src)
209{
210 register unsigned long reg0 asm("0") = 0UL;
211 unsigned long tmp1, tmp2;
212
213 asm volatile(
214 " la %2,0(%1)\n"
215 " la %3,0(%0,%1)\n"
216 " "SLR" %0,%0\n"
217 " sacf 256\n"
218 "0: srst %3,%2\n"
219 " jo 0b\n"
220 " la %0,1(%3)\n" /* strnlen_user results includes \0 */
221 " "SLR" %0,%1\n"
222 "1: sacf 0\n"
223 EX_TABLE(0b,1b)
224 : "+a" (size), "+a" (src), "=a" (tmp1), "=a" (tmp2)
225 : "d" (reg0) : "cc", "memory");
226 return size;
227}
228
229size_t strncpy_from_user_std(size_t size, const char __user *src, char *dst)
230{
231 register unsigned long reg0 asm("0") = 0UL;
232 unsigned long tmp1, tmp2;
233
234 asm volatile(
235 " la %3,0(%1)\n"
236 " la %4,0(%0,%1)\n"
237 " sacf 256\n"
238 "0: srst %4,%3\n"
239 " jo 0b\n"
240 " sacf 0\n"
241 " la %0,0(%4)\n"
242 " jh 1f\n" /* found \0 in string ? */
243 " "AHI" %4,1\n" /* include \0 in copy */
244 "1:"SLR" %0,%1\n" /* %0 = return length (without \0) */
245 " "SLR" %4,%1\n" /* %4 = copy length (including \0) */
246 "2: mvcp 0(%4,%2),0(%1),%5\n"
247 " jz 9f\n"
248 "3:"AHI" %4,-256\n"
249 " la %1,256(%1)\n"
250 " la %2,256(%2)\n"
251 "4: mvcp 0(%4,%2),0(%1),%5\n"
252 " jnz 3b\n"
253 " j 9f\n"
254 "7: sacf 0\n"
255 "8:"LHI" %0,%6\n"
256 "9:\n"
257 EX_TABLE(0b,7b) EX_TABLE(2b,8b) EX_TABLE(4b,8b)
258 : "+a" (size), "+a" (src), "+d" (dst), "=a" (tmp1), "=a" (tmp2)
259 : "d" (reg0), "K" (-EFAULT) : "cc", "memory");
260 return size;
261}
262
263#define __futex_atomic_op(insn, ret, oldval, newval, uaddr, oparg) \
264 asm volatile( \
265 " sacf 256\n" \
266 "0: l %1,0(%6)\n" \
267 "1:"insn \
268 "2: cs %1,%2,0(%6)\n" \
269 "3: jl 1b\n" \
270 " lhi %0,0\n" \
271 "4: sacf 0\n" \
272 EX_TABLE(0b,4b) EX_TABLE(2b,4b) EX_TABLE(3b,4b) \
273 : "=d" (ret), "=&d" (oldval), "=&d" (newval), \
274 "=m" (*uaddr) \
275 : "0" (-EFAULT), "d" (oparg), "a" (uaddr), \
276 "m" (*uaddr) : "cc");
277
278int futex_atomic_op(int op, int __user *uaddr, int oparg, int *old)
279{
280 int oldval = 0, newval, ret;
281
282 inc_preempt_count();
283
284 switch (op) {
285 case FUTEX_OP_SET:
286 __futex_atomic_op("lr %2,%5\n",
287 ret, oldval, newval, uaddr, oparg);
288 break;
289 case FUTEX_OP_ADD:
290 __futex_atomic_op("lr %2,%1\nar %2,%5\n",
291 ret, oldval, newval, uaddr, oparg);
292 break;
293 case FUTEX_OP_OR:
294 __futex_atomic_op("lr %2,%1\nor %2,%5\n",
295 ret, oldval, newval, uaddr, oparg);
296 break;
297 case FUTEX_OP_ANDN:
298 __futex_atomic_op("lr %2,%1\nnr %2,%5\n",
299 ret, oldval, newval, uaddr, oparg);
300 break;
301 case FUTEX_OP_XOR:
302 __futex_atomic_op("lr %2,%1\nxr %2,%5\n",
303 ret, oldval, newval, uaddr, oparg);
304 break;
305 default:
306 ret = -ENOSYS;
307 }
308 dec_preempt_count();
309 *old = oldval;
310 return ret;
311}
312
313int futex_atomic_cmpxchg(int __user *uaddr, int oldval, int newval)
314{
315 int ret;
316
317 asm volatile(
318 " sacf 256\n"
319 " cs %1,%4,0(%5)\n"
320 "0: lr %0,%1\n"
321 "1: sacf 0\n"
322 EX_TABLE(0b,1b)
323 : "=d" (ret), "+d" (oldval), "=m" (*uaddr)
324 : "0" (-EFAULT), "d" (newval), "a" (uaddr), "m" (*uaddr)
325 : "cc", "memory" );
326 return ret;
327}
328
329struct uaccess_ops uaccess_std = {
330 .copy_from_user = copy_from_user_std,
331 .copy_from_user_small = copy_from_user_std_small,
332 .copy_to_user = copy_to_user_std,
333 .copy_to_user_small = copy_to_user_std_small,
334 .copy_in_user = copy_in_user_std,
335 .clear_user = clear_user_std,
336 .strnlen_user = strnlen_user_std,
337 .strncpy_from_user = strncpy_from_user_std,
338 .futex_atomic_op = futex_atomic_op,
339 .futex_atomic_cmpxchg = futex_atomic_cmpxchg,
340};
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-05 00:28:43 -0500