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authorArnd Bergmann <arnd@arndb.de>2018-03-07 15:36:19 -0500
committerArnd Bergmann <arnd@arndb.de>2018-03-09 17:20:00 -0500
commit553b085c2075f6a4a2591108554f830fa61e881f (patch)
tree68d63911f2c12e0fb9fa23498df9300442a88f92 /arch/m32r/lib/usercopy.c
parentfd8773f9f544955f6f47dc2ac3ab85ad64376b7f (diff)
arch: remove m32r port
The Mitsubishi/Renesas m32r architecture has been around for many years, but the Linux port has been obsolete for a very long time as well, with the last significant updates done for linux-2.6.14. While some m32r microcontrollers are still being marketed by Renesas, those are apparently no longer possible to support, mainly due to the lack of an external memory interface. Hirokazu Takata was the maintainer until the architecture got marked Orphaned in 2014. Link: http://www.linux-m32r.org/ Link: https://www.renesas.com/en-eu/products/microcontrollers-microprocessors/m32r.html Cc: Hirokazu Takata <takata@linux-m32r.org> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/m32r/lib/usercopy.c')
-rw-r--r--arch/m32r/lib/usercopy.c362
1 files changed, 0 insertions, 362 deletions
diff --git a/arch/m32r/lib/usercopy.c b/arch/m32r/lib/usercopy.c
deleted file mode 100644
index 0892a4341b3a..000000000000
--- a/arch/m32r/lib/usercopy.c
+++ /dev/null
@@ -1,362 +0,0 @@
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * User address space access functions.
4 * The non inlined parts of asm-m32r/uaccess.h are here.
5 *
6 * Copyright 1997 Andi Kleen <ak@muc.de>
7 * Copyright 1997 Linus Torvalds
8 * Copyright 2001, 2002, 2004 Hirokazu Takata
9 */
10#include <linux/prefetch.h>
11#include <linux/string.h>
12#include <linux/thread_info.h>
13#include <linux/uaccess.h>
14
15/*
16 * Copy a null terminated string from userspace.
17 */
18
19#ifdef CONFIG_ISA_DUAL_ISSUE
20
21#define __do_strncpy_from_user(dst,src,count,res) \
22do { \
23 int __d0, __d1, __d2; \
24 __asm__ __volatile__( \
25 " beqz %1, 2f\n" \
26 " .fillinsn\n" \
27 "0: ldb r14, @%3 || addi %3, #1\n" \
28 " stb r14, @%4 || addi %4, #1\n" \
29 " beqz r14, 1f\n" \
30 " addi %1, #-1\n" \
31 " bnez %1, 0b\n" \
32 " .fillinsn\n" \
33 "1: sub %0, %1\n" \
34 " .fillinsn\n" \
35 "2:\n" \
36 ".section .fixup,\"ax\"\n" \
37 " .balign 4\n" \
38 "3: seth r14, #high(2b)\n" \
39 " or3 r14, r14, #low(2b)\n" \
40 " jmp r14 || ldi %0, #%5\n" \
41 ".previous\n" \
42 ".section __ex_table,\"a\"\n" \
43 " .balign 4\n" \
44 " .long 0b,3b\n" \
45 ".previous" \
46 : "=&r"(res), "=&r"(count), "=&r" (__d0), "=&r" (__d1), \
47 "=&r" (__d2) \
48 : "i"(-EFAULT), "0"(count), "1"(count), "3"(src), \
49 "4"(dst) \
50 : "r14", "cbit", "memory"); \
51} while (0)
52
53#else /* not CONFIG_ISA_DUAL_ISSUE */
54
55#define __do_strncpy_from_user(dst,src,count,res) \
56do { \
57 int __d0, __d1, __d2; \
58 __asm__ __volatile__( \
59 " beqz %1, 2f\n" \
60 " .fillinsn\n" \
61 "0: ldb r14, @%3\n" \
62 " stb r14, @%4\n" \
63 " addi %3, #1\n" \
64 " addi %4, #1\n" \
65 " beqz r14, 1f\n" \
66 " addi %1, #-1\n" \
67 " bnez %1, 0b\n" \
68 " .fillinsn\n" \
69 "1: sub %0, %1\n" \
70 " .fillinsn\n" \
71 "2:\n" \
72 ".section .fixup,\"ax\"\n" \
73 " .balign 4\n" \
74 "3: ldi %0, #%5\n" \
75 " seth r14, #high(2b)\n" \
76 " or3 r14, r14, #low(2b)\n" \
77 " jmp r14\n" \
78 ".previous\n" \
79 ".section __ex_table,\"a\"\n" \
80 " .balign 4\n" \
81 " .long 0b,3b\n" \
82 ".previous" \
83 : "=&r"(res), "=&r"(count), "=&r" (__d0), "=&r" (__d1), \
84 "=&r" (__d2) \
85 : "i"(-EFAULT), "0"(count), "1"(count), "3"(src), \
86 "4"(dst) \
87 : "r14", "cbit", "memory"); \
88} while (0)
89
90#endif /* CONFIG_ISA_DUAL_ISSUE */
91
92long
93strncpy_from_user(char *dst, const char __user *src, long count)
94{
95 long res = -EFAULT;
96 if (access_ok(VERIFY_READ, src, 1))
97 __do_strncpy_from_user(dst, src, count, res);
98 return res;
99}
100
101
102/*
103 * Zero Userspace
104 */
105
106#ifdef CONFIG_ISA_DUAL_ISSUE
107
108#define __do_clear_user(addr,size) \
109do { \
110 int __dst, __c; \
111 __asm__ __volatile__( \
112 " beqz %1, 9f\n" \
113 " and3 r14, %0, #3\n" \
114 " bnez r14, 2f\n" \
115 " and3 r14, %1, #3\n" \
116 " bnez r14, 2f\n" \
117 " and3 %1, %1, #3\n" \
118 " beqz %2, 2f\n" \
119 " addi %0, #-4\n" \
120 " .fillinsn\n" \
121 "0: ; word clear \n" \
122 " st %6, @+%0 || addi %2, #-1\n" \
123 " bnez %2, 0b\n" \
124 " beqz %1, 9f\n" \
125 " .fillinsn\n" \
126 "2: ; byte clear \n" \
127 " stb %6, @%0 || addi %1, #-1\n" \
128 " addi %0, #1\n" \
129 " bnez %1, 2b\n" \
130 " .fillinsn\n" \
131 "9:\n" \
132 ".section .fixup,\"ax\"\n" \
133 " .balign 4\n" \
134 "4: slli %2, #2\n" \
135 " seth r14, #high(9b)\n" \
136 " or3 r14, r14, #low(9b)\n" \
137 " jmp r14 || add %1, %2\n" \
138 ".previous\n" \
139 ".section __ex_table,\"a\"\n" \
140 " .balign 4\n" \
141 " .long 0b,4b\n" \
142 " .long 2b,9b\n" \
143 ".previous\n" \
144 : "=&r"(__dst), "=&r"(size), "=&r"(__c) \
145 : "0"(addr), "1"(size), "2"(size / 4), "r"(0) \
146 : "r14", "cbit", "memory"); \
147} while (0)
148
149#else /* not CONFIG_ISA_DUAL_ISSUE */
150
151#define __do_clear_user(addr,size) \
152do { \
153 int __dst, __c; \
154 __asm__ __volatile__( \
155 " beqz %1, 9f\n" \
156 " and3 r14, %0, #3\n" \
157 " bnez r14, 2f\n" \
158 " and3 r14, %1, #3\n" \
159 " bnez r14, 2f\n" \
160 " and3 %1, %1, #3\n" \
161 " beqz %2, 2f\n" \
162 " addi %0, #-4\n" \
163 " .fillinsn\n" \
164 "0: st %6, @+%0 ; word clear \n" \
165 " addi %2, #-1\n" \
166 " bnez %2, 0b\n" \
167 " beqz %1, 9f\n" \
168 " .fillinsn\n" \
169 "2: stb %6, @%0 ; byte clear \n" \
170 " addi %1, #-1\n" \
171 " addi %0, #1\n" \
172 " bnez %1, 2b\n" \
173 " .fillinsn\n" \
174 "9:\n" \
175 ".section .fixup,\"ax\"\n" \
176 " .balign 4\n" \
177 "4: slli %2, #2\n" \
178 " add %1, %2\n" \
179 " seth r14, #high(9b)\n" \
180 " or3 r14, r14, #low(9b)\n" \
181 " jmp r14\n" \
182 ".previous\n" \
183 ".section __ex_table,\"a\"\n" \
184 " .balign 4\n" \
185 " .long 0b,4b\n" \
186 " .long 2b,9b\n" \
187 ".previous\n" \
188 : "=&r"(__dst), "=&r"(size), "=&r"(__c) \
189 : "0"(addr), "1"(size), "2"(size / 4), "r"(0) \
190 : "r14", "cbit", "memory"); \
191} while (0)
192
193#endif /* not CONFIG_ISA_DUAL_ISSUE */
194
195unsigned long
196clear_user(void __user *to, unsigned long n)
197{
198 if (access_ok(VERIFY_WRITE, to, n))
199 __do_clear_user(to, n);
200 return n;
201}
202
203unsigned long
204__clear_user(void __user *to, unsigned long n)
205{
206 __do_clear_user(to, n);
207 return n;
208}
209
210/*
211 * Return the size of a string (including the ending 0)
212 *
213 * Return 0 on exception, a value greater than N if too long
214 */
215
216#ifdef CONFIG_ISA_DUAL_ISSUE
217
218long strnlen_user(const char __user *s, long n)
219{
220 unsigned long mask = -__addr_ok(s);
221 unsigned long res;
222
223 __asm__ __volatile__(
224 " and %0, %5 || mv r1, %1\n"
225 " beqz %0, strnlen_exit\n"
226 " and3 r0, %1, #3\n"
227 " bnez r0, strnlen_byte_loop\n"
228 " cmpui %0, #4\n"
229 " bc strnlen_byte_loop\n"
230 "strnlen_word_loop:\n"
231 "0: ld r0, @%1+\n"
232 " pcmpbz r0\n"
233 " bc strnlen_last_bytes_fixup\n"
234 " addi %0, #-4\n"
235 " beqz %0, strnlen_exit\n"
236 " bgtz %0, strnlen_word_loop\n"
237 "strnlen_last_bytes:\n"
238 " mv %0, %4\n"
239 "strnlen_last_bytes_fixup:\n"
240 " addi %1, #-4\n"
241 "strnlen_byte_loop:\n"
242 "1: ldb r0, @%1 || addi %0, #-1\n"
243 " beqz r0, strnlen_exit\n"
244 " addi %1, #1\n"
245 " bnez %0, strnlen_byte_loop\n"
246 "strnlen_exit:\n"
247 " sub %1, r1\n"
248 " add3 %0, %1, #1\n"
249 " .fillinsn\n"
250 "9:\n"
251 ".section .fixup,\"ax\"\n"
252 " .balign 4\n"
253 "4: addi %1, #-4\n"
254 " .fillinsn\n"
255 "5: seth r1, #high(9b)\n"
256 " or3 r1, r1, #low(9b)\n"
257 " jmp r1 || ldi %0, #0\n"
258 ".previous\n"
259 ".section __ex_table,\"a\"\n"
260 " .balign 4\n"
261 " .long 0b,4b\n"
262 " .long 1b,5b\n"
263 ".previous"
264 : "=&r" (res), "=r" (s)
265 : "0" (n), "1" (s), "r" (n & 3), "r" (mask), "r"(0x01010101)
266 : "r0", "r1", "cbit");
267
268 /* NOTE: strnlen_user() algorithm:
269 * {
270 * char *p;
271 * for (p = s; n-- && *p != '\0'; ++p)
272 * ;
273 * return p - s + 1;
274 * }
275 */
276
277 /* NOTE: If a null char. exists, return 0.
278 * if ((x - 0x01010101) & ~x & 0x80808080)\n"
279 * return 0;\n"
280 */
281
282 return res & mask;
283}
284
285#else /* not CONFIG_ISA_DUAL_ISSUE */
286
287long strnlen_user(const char __user *s, long n)
288{
289 unsigned long mask = -__addr_ok(s);
290 unsigned long res;
291
292 __asm__ __volatile__(
293 " and %0, %5\n"
294 " mv r1, %1\n"
295 " beqz %0, strnlen_exit\n"
296 " and3 r0, %1, #3\n"
297 " bnez r0, strnlen_byte_loop\n"
298 " cmpui %0, #4\n"
299 " bc strnlen_byte_loop\n"
300 " sll3 r3, %6, #7\n"
301 "strnlen_word_loop:\n"
302 "0: ld r0, @%1+\n"
303 " not r2, r0\n"
304 " sub r0, %6\n"
305 " and r2, r3\n"
306 " and r2, r0\n"
307 " bnez r2, strnlen_last_bytes_fixup\n"
308 " addi %0, #-4\n"
309 " beqz %0, strnlen_exit\n"
310 " bgtz %0, strnlen_word_loop\n"
311 "strnlen_last_bytes:\n"
312 " mv %0, %4\n"
313 "strnlen_last_bytes_fixup:\n"
314 " addi %1, #-4\n"
315 "strnlen_byte_loop:\n"
316 "1: ldb r0, @%1\n"
317 " addi %0, #-1\n"
318 " beqz r0, strnlen_exit\n"
319 " addi %1, #1\n"
320 " bnez %0, strnlen_byte_loop\n"
321 "strnlen_exit:\n"
322 " sub %1, r1\n"
323 " add3 %0, %1, #1\n"
324 " .fillinsn\n"
325 "9:\n"
326 ".section .fixup,\"ax\"\n"
327 " .balign 4\n"
328 "4: addi %1, #-4\n"
329 " .fillinsn\n"
330 "5: ldi %0, #0\n"
331 " seth r1, #high(9b)\n"
332 " or3 r1, r1, #low(9b)\n"
333 " jmp r1\n"
334 ".previous\n"
335 ".section __ex_table,\"a\"\n"
336 " .balign 4\n"
337 " .long 0b,4b\n"
338 " .long 1b,5b\n"
339 ".previous"
340 : "=&r" (res), "=r" (s)
341 : "0" (n), "1" (s), "r" (n & 3), "r" (mask), "r"(0x01010101)
342 : "r0", "r1", "r2", "r3", "cbit");
343
344 /* NOTE: strnlen_user() algorithm:
345 * {
346 * char *p;
347 * for (p = s; n-- && *p != '\0'; ++p)
348 * ;
349 * return p - s + 1;
350 * }
351 */
352
353 /* NOTE: If a null char. exists, return 0.
354 * if ((x - 0x01010101) & ~x & 0x80808080)\n"
355 * return 0;\n"
356 */
357
358 return res & mask;
359}
360
361#endif /* CONFIG_ISA_DUAL_ISSUE */
362
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