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1da177e4 LT |
1 | #ifndef _ASM_M32R_UACCESS_H |
2 | #define _ASM_M32R_UACCESS_H | |
3 | ||
4 | /* | |
5 | * linux/include/asm-m32r/uaccess.h | |
6 | * | |
7 | * M32R version. | |
04dfd0de | 8 | * Copyright (C) 2004, 2006 Hirokazu Takata <takata at linux-m32r.org> |
1da177e4 LT |
9 | */ |
10 | ||
1da177e4 LT |
11 | /* |
12 | * User space memory access functions | |
13 | */ | |
1da177e4 LT |
14 | #include <linux/errno.h> |
15 | #include <linux/thread_info.h> | |
16 | #include <asm/page.h> | |
ec0ced15 | 17 | #include <asm/setup.h> |
1da177e4 LT |
18 | |
19 | #define VERIFY_READ 0 | |
20 | #define VERIFY_WRITE 1 | |
21 | ||
22 | /* | |
23 | * The fs value determines whether argument validity checking should be | |
24 | * performed or not. If get_fs() == USER_DS, checking is performed, with | |
25 | * get_fs() == KERNEL_DS, checking is bypassed. | |
26 | * | |
27 | * For historical reasons, these macros are grossly misnamed. | |
28 | */ | |
29 | ||
30 | #define MAKE_MM_SEG(s) ((mm_segment_t) { (s) }) | |
31 | ||
32 | #ifdef CONFIG_MMU | |
04dfd0de | 33 | |
1da177e4 LT |
34 | #define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFF) |
35 | #define USER_DS MAKE_MM_SEG(PAGE_OFFSET) | |
1da177e4 | 36 | #define get_ds() (KERNEL_DS) |
1da177e4 LT |
37 | #define get_fs() (current_thread_info()->addr_limit) |
38 | #define set_fs(x) (current_thread_info()->addr_limit = (x)) | |
04dfd0de HT |
39 | |
40 | #else /* not CONFIG_MMU */ | |
41 | ||
42 | #define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFF) | |
43 | #define USER_DS MAKE_MM_SEG(0xFFFFFFFF) | |
44 | #define get_ds() (KERNEL_DS) | |
45 | ||
1da177e4 LT |
46 | static inline mm_segment_t get_fs(void) |
47 | { | |
04dfd0de | 48 | return USER_DS; |
1da177e4 LT |
49 | } |
50 | ||
51 | static inline void set_fs(mm_segment_t s) | |
52 | { | |
53 | } | |
04dfd0de HT |
54 | |
55 | #endif /* not CONFIG_MMU */ | |
1da177e4 | 56 | |
0ab06604 | 57 | #define segment_eq(a, b) ((a).seg == (b).seg) |
1da177e4 LT |
58 | |
59 | #define __addr_ok(addr) \ | |
60 | ((unsigned long)(addr) < (current_thread_info()->addr_limit.seg)) | |
61 | ||
62 | /* | |
63 | * Test whether a block of memory is a valid user space address. | |
64 | * Returns 0 if the range is valid, nonzero otherwise. | |
65 | * | |
66 | * This is equivalent to the following test: | |
67 | * (u33)addr + (u33)size >= (u33)current->addr_limit.seg | |
68 | * | |
69 | * This needs 33-bit arithmetic. We have a carry... | |
70 | */ | |
0ab06604 | 71 | #define __range_ok(addr, size) ({ \ |
16cf5b39 | 72 | unsigned long flag, roksum; \ |
1da177e4 LT |
73 | __chk_user_ptr(addr); \ |
74 | asm ( \ | |
75 | " cmpu %1, %1 ; clear cbit\n" \ | |
76 | " addx %1, %3 ; set cbit if overflow\n" \ | |
77 | " subx %0, %0\n" \ | |
78 | " cmpu %4, %1\n" \ | |
79 | " subx %0, %5\n" \ | |
16cf5b39 | 80 | : "=&r" (flag), "=r" (roksum) \ |
04dfd0de HT |
81 | : "1" (addr), "r" ((int)(size)), \ |
82 | "r" (current_thread_info()->addr_limit.seg), "r" (0) \ | |
1da177e4 LT |
83 | : "cbit" ); \ |
84 | flag; }) | |
85 | ||
86 | /** | |
87 | * access_ok: - Checks if a user space pointer is valid | |
88 | * @type: Type of access: %VERIFY_READ or %VERIFY_WRITE. Note that | |
89 | * %VERIFY_WRITE is a superset of %VERIFY_READ - if it is safe | |
90 | * to write to a block, it is always safe to read from it. | |
91 | * @addr: User space pointer to start of block to check | |
92 | * @size: Size of block to check | |
93 | * | |
b3c395ef DH |
94 | * Context: User context only. This function may sleep if pagefaults are |
95 | * enabled. | |
1da177e4 LT |
96 | * |
97 | * Checks if a pointer to a block of memory in user space is valid. | |
98 | * | |
99 | * Returns true (nonzero) if the memory block may be valid, false (zero) | |
100 | * if it is definitely invalid. | |
101 | * | |
102 | * Note that, depending on architecture, this function probably just | |
103 | * checks that the pointer is in the user space range - after calling | |
104 | * this function, memory access functions may still return -EFAULT. | |
105 | */ | |
106 | #ifdef CONFIG_MMU | |
0ab06604 | 107 | #define access_ok(type, addr, size) (likely(__range_ok(addr, size) == 0)) |
1da177e4 LT |
108 | #else |
109 | static inline int access_ok(int type, const void *addr, unsigned long size) | |
110 | { | |
04dfd0de | 111 | unsigned long val = (unsigned long)addr; |
1da177e4 | 112 | |
04dfd0de | 113 | return ((val >= memory_start) && ((val + size) < memory_end)); |
1da177e4 LT |
114 | } |
115 | #endif /* CONFIG_MMU */ | |
116 | ||
1da177e4 LT |
117 | /* |
118 | * The exception table consists of pairs of addresses: the first is the | |
119 | * address of an instruction that is allowed to fault, and the second is | |
120 | * the address at which the program should continue. No registers are | |
121 | * modified, so it is entirely up to the continuation code to figure out | |
122 | * what to do. | |
123 | * | |
124 | * All the routines below use bits of fixup code that are out of line | |
125 | * with the main instruction path. This means when everything is well, | |
126 | * we don't even have to jump over them. Further, they do not intrude | |
127 | * on our cache or tlb entries. | |
128 | */ | |
129 | ||
130 | struct exception_table_entry | |
131 | { | |
132 | unsigned long insn, fixup; | |
133 | }; | |
134 | ||
135 | extern int fixup_exception(struct pt_regs *regs); | |
136 | ||
137 | /* | |
138 | * These are the main single-value transfer routines. They automatically | |
139 | * use the right size if we just have the right pointer type. | |
140 | * | |
141 | * This gets kind of ugly. We want to return _two_ values in "get_user()" | |
142 | * and yet we don't want to do any pointers, because that is too much | |
143 | * of a performance impact. Thus we have a few rather ugly macros here, | |
144 | * and hide all the uglyness from the user. | |
145 | * | |
146 | * The "__xxx" versions of the user access functions are versions that | |
147 | * do not verify the address space, that must have been done previously | |
148 | * with a separate "access_ok()" call (this is used when we do multiple | |
149 | * accesses to the same area of user memory). | |
150 | */ | |
151 | ||
1da177e4 LT |
152 | /* Careful: we have to cast the result to the type of the pointer for sign |
153 | reasons */ | |
154 | /** | |
155 | * get_user: - Get a simple variable from user space. | |
156 | * @x: Variable to store result. | |
157 | * @ptr: Source address, in user space. | |
158 | * | |
b3c395ef DH |
159 | * Context: User context only. This function may sleep if pagefaults are |
160 | * enabled. | |
1da177e4 LT |
161 | * |
162 | * This macro copies a single simple variable from user space to kernel | |
163 | * space. It supports simple types like char and int, but not larger | |
164 | * data types like structures or arrays. | |
165 | * | |
166 | * @ptr must have pointer-to-simple-variable type, and the result of | |
167 | * dereferencing @ptr must be assignable to @x without a cast. | |
168 | * | |
169 | * Returns zero on success, or -EFAULT on error. | |
170 | * On error, the variable @x is set to zero. | |
171 | */ | |
0ab06604 MT |
172 | #define get_user(x, ptr) \ |
173 | __get_user_check((x), (ptr), sizeof(*(ptr))) | |
1da177e4 LT |
174 | |
175 | /** | |
176 | * put_user: - Write a simple value into user space. | |
177 | * @x: Value to copy to user space. | |
178 | * @ptr: Destination address, in user space. | |
179 | * | |
b3c395ef DH |
180 | * Context: User context only. This function may sleep if pagefaults are |
181 | * enabled. | |
1da177e4 LT |
182 | * |
183 | * This macro copies a single simple value from kernel space to user | |
184 | * space. It supports simple types like char and int, but not larger | |
185 | * data types like structures or arrays. | |
186 | * | |
187 | * @ptr must have pointer-to-simple-variable type, and @x must be assignable | |
188 | * to the result of dereferencing @ptr. | |
189 | * | |
190 | * Returns zero on success, or -EFAULT on error. | |
191 | */ | |
0ab06604 MT |
192 | #define put_user(x, ptr) \ |
193 | __put_user_check((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr))) | |
1da177e4 LT |
194 | |
195 | /** | |
196 | * __get_user: - Get a simple variable from user space, with less checking. | |
197 | * @x: Variable to store result. | |
198 | * @ptr: Source address, in user space. | |
199 | * | |
b3c395ef DH |
200 | * Context: User context only. This function may sleep if pagefaults are |
201 | * enabled. | |
1da177e4 LT |
202 | * |
203 | * This macro copies a single simple variable from user space to kernel | |
204 | * space. It supports simple types like char and int, but not larger | |
205 | * data types like structures or arrays. | |
206 | * | |
207 | * @ptr must have pointer-to-simple-variable type, and the result of | |
208 | * dereferencing @ptr must be assignable to @x without a cast. | |
209 | * | |
210 | * Caller must check the pointer with access_ok() before calling this | |
211 | * function. | |
212 | * | |
213 | * Returns zero on success, or -EFAULT on error. | |
214 | * On error, the variable @x is set to zero. | |
215 | */ | |
0ab06604 MT |
216 | #define __get_user(x, ptr) \ |
217 | __get_user_nocheck((x), (ptr), sizeof(*(ptr))) | |
1da177e4 | 218 | |
0ab06604 | 219 | #define __get_user_nocheck(x, ptr, size) \ |
04dfd0de HT |
220 | ({ \ |
221 | long __gu_err = 0; \ | |
c90a3bc5 | 222 | unsigned long __gu_val = 0; \ |
01682576 | 223 | might_fault(); \ |
0ab06604 | 224 | __get_user_size(__gu_val, (ptr), (size), __gu_err); \ |
a618337e | 225 | (x) = (__force __typeof__(*(ptr)))__gu_val; \ |
04dfd0de HT |
226 | __gu_err; \ |
227 | }) | |
228 | ||
0ab06604 | 229 | #define __get_user_check(x, ptr, size) \ |
04dfd0de HT |
230 | ({ \ |
231 | long __gu_err = -EFAULT; \ | |
232 | unsigned long __gu_val = 0; \ | |
233 | const __typeof__(*(ptr)) __user *__gu_addr = (ptr); \ | |
01682576 | 234 | might_fault(); \ |
0ab06604 MT |
235 | if (access_ok(VERIFY_READ, __gu_addr, size)) \ |
236 | __get_user_size(__gu_val, __gu_addr, (size), __gu_err); \ | |
a618337e | 237 | (x) = (__force __typeof__(*(ptr)))__gu_val; \ |
04dfd0de HT |
238 | __gu_err; \ |
239 | }) | |
240 | ||
241 | extern long __get_user_bad(void); | |
242 | ||
0ab06604 | 243 | #define __get_user_size(x, ptr, size, retval) \ |
04dfd0de HT |
244 | do { \ |
245 | retval = 0; \ | |
246 | __chk_user_ptr(ptr); \ | |
247 | switch (size) { \ | |
0ab06604 MT |
248 | case 1: __get_user_asm(x, ptr, retval, "ub"); break; \ |
249 | case 2: __get_user_asm(x, ptr, retval, "uh"); break; \ | |
250 | case 4: __get_user_asm(x, ptr, retval, ""); break; \ | |
04dfd0de HT |
251 | default: (x) = __get_user_bad(); \ |
252 | } \ | |
253 | } while (0) | |
254 | ||
255 | #define __get_user_asm(x, addr, err, itype) \ | |
256 | __asm__ __volatile__( \ | |
257 | " .fillinsn\n" \ | |
258 | "1: ld"itype" %1,@%2\n" \ | |
259 | " .fillinsn\n" \ | |
260 | "2:\n" \ | |
261 | ".section .fixup,\"ax\"\n" \ | |
262 | " .balign 4\n" \ | |
263 | "3: ldi %0,%3\n" \ | |
264 | " seth r14,#high(2b)\n" \ | |
265 | " or3 r14,r14,#low(2b)\n" \ | |
266 | " jmp r14\n" \ | |
267 | ".previous\n" \ | |
268 | ".section __ex_table,\"a\"\n" \ | |
269 | " .balign 4\n" \ | |
270 | " .long 1b,3b\n" \ | |
271 | ".previous" \ | |
272 | : "=&r" (err), "=&r" (x) \ | |
273 | : "r" (addr), "i" (-EFAULT), "0" (err) \ | |
274 | : "r14", "memory") | |
1da177e4 LT |
275 | |
276 | /** | |
277 | * __put_user: - Write a simple value into user space, with less checking. | |
278 | * @x: Value to copy to user space. | |
279 | * @ptr: Destination address, in user space. | |
280 | * | |
b3c395ef DH |
281 | * Context: User context only. This function may sleep if pagefaults are |
282 | * enabled. | |
1da177e4 LT |
283 | * |
284 | * This macro copies a single simple value from kernel space to user | |
285 | * space. It supports simple types like char and int, but not larger | |
286 | * data types like structures or arrays. | |
287 | * | |
288 | * @ptr must have pointer-to-simple-variable type, and @x must be assignable | |
289 | * to the result of dereferencing @ptr. | |
290 | * | |
291 | * Caller must check the pointer with access_ok() before calling this | |
292 | * function. | |
293 | * | |
294 | * Returns zero on success, or -EFAULT on error. | |
295 | */ | |
0ab06604 MT |
296 | #define __put_user(x, ptr) \ |
297 | __put_user_nocheck((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr))) | |
04dfd0de | 298 | |
1da177e4 | 299 | |
0ab06604 | 300 | #define __put_user_nocheck(x, ptr, size) \ |
1da177e4 LT |
301 | ({ \ |
302 | long __pu_err; \ | |
01682576 | 303 | might_fault(); \ |
0ab06604 | 304 | __put_user_size((x), (ptr), (size), __pu_err); \ |
1da177e4 LT |
305 | __pu_err; \ |
306 | }) | |
307 | ||
308 | ||
0ab06604 | 309 | #define __put_user_check(x, ptr, size) \ |
1da177e4 LT |
310 | ({ \ |
311 | long __pu_err = -EFAULT; \ | |
312 | __typeof__(*(ptr)) __user *__pu_addr = (ptr); \ | |
01682576 | 313 | might_fault(); \ |
0ab06604 MT |
314 | if (access_ok(VERIFY_WRITE, __pu_addr, size)) \ |
315 | __put_user_size((x), __pu_addr, (size), __pu_err); \ | |
1da177e4 LT |
316 | __pu_err; \ |
317 | }) | |
318 | ||
319 | #if defined(__LITTLE_ENDIAN__) | |
04dfd0de HT |
320 | #define __put_user_u64(x, addr, err) \ |
321 | __asm__ __volatile__( \ | |
322 | " .fillinsn\n" \ | |
323 | "1: st %L1,@%2\n" \ | |
324 | " .fillinsn\n" \ | |
325 | "2: st %H1,@(4,%2)\n" \ | |
326 | " .fillinsn\n" \ | |
327 | "3:\n" \ | |
328 | ".section .fixup,\"ax\"\n" \ | |
329 | " .balign 4\n" \ | |
330 | "4: ldi %0,%3\n" \ | |
331 | " seth r14,#high(3b)\n" \ | |
332 | " or3 r14,r14,#low(3b)\n" \ | |
333 | " jmp r14\n" \ | |
334 | ".previous\n" \ | |
335 | ".section __ex_table,\"a\"\n" \ | |
336 | " .balign 4\n" \ | |
337 | " .long 1b,4b\n" \ | |
338 | " .long 2b,4b\n" \ | |
339 | ".previous" \ | |
340 | : "=&r" (err) \ | |
341 | : "r" (x), "r" (addr), "i" (-EFAULT), "0" (err) \ | |
1da177e4 LT |
342 | : "r14", "memory") |
343 | ||
344 | #elif defined(__BIG_ENDIAN__) | |
345 | #define __put_user_u64(x, addr, err) \ | |
346 | __asm__ __volatile__( \ | |
347 | " .fillinsn\n" \ | |
348 | "1: st %H1,@%2\n" \ | |
349 | " .fillinsn\n" \ | |
350 | "2: st %L1,@(4,%2)\n" \ | |
351 | " .fillinsn\n" \ | |
352 | "3:\n" \ | |
353 | ".section .fixup,\"ax\"\n" \ | |
354 | " .balign 4\n" \ | |
355 | "4: ldi %0,%3\n" \ | |
356 | " seth r14,#high(3b)\n" \ | |
357 | " or3 r14,r14,#low(3b)\n" \ | |
358 | " jmp r14\n" \ | |
359 | ".previous\n" \ | |
360 | ".section __ex_table,\"a\"\n" \ | |
361 | " .balign 4\n" \ | |
362 | " .long 1b,4b\n" \ | |
363 | " .long 2b,4b\n" \ | |
364 | ".previous" \ | |
04dfd0de HT |
365 | : "=&r" (err) \ |
366 | : "r" (x), "r" (addr), "i" (-EFAULT), "0" (err) \ | |
1da177e4 LT |
367 | : "r14", "memory") |
368 | #else | |
369 | #error no endian defined | |
370 | #endif | |
371 | ||
04dfd0de HT |
372 | extern void __put_user_bad(void); |
373 | ||
0ab06604 | 374 | #define __put_user_size(x, ptr, size, retval) \ |
1da177e4 LT |
375 | do { \ |
376 | retval = 0; \ | |
377 | __chk_user_ptr(ptr); \ | |
378 | switch (size) { \ | |
0ab06604 MT |
379 | case 1: __put_user_asm(x, ptr, retval, "b"); break; \ |
380 | case 2: __put_user_asm(x, ptr, retval, "h"); break; \ | |
381 | case 4: __put_user_asm(x, ptr, retval, ""); break; \ | |
382 | case 8: __put_user_u64((__typeof__(*ptr))(x), ptr, retval); break;\ | |
1da177e4 LT |
383 | default: __put_user_bad(); \ |
384 | } \ | |
385 | } while (0) | |
386 | ||
387 | struct __large_struct { unsigned long buf[100]; }; | |
388 | #define __m(x) (*(struct __large_struct *)(x)) | |
389 | ||
390 | /* | |
391 | * Tell gcc we read from memory instead of writing: this is because | |
392 | * we do not write to any memory gcc knows about, so there are no | |
393 | * aliasing issues. | |
394 | */ | |
395 | #define __put_user_asm(x, addr, err, itype) \ | |
396 | __asm__ __volatile__( \ | |
397 | " .fillinsn\n" \ | |
398 | "1: st"itype" %1,@%2\n" \ | |
399 | " .fillinsn\n" \ | |
400 | "2:\n" \ | |
401 | ".section .fixup,\"ax\"\n" \ | |
402 | " .balign 4\n" \ | |
403 | "3: ldi %0,%3\n" \ | |
404 | " seth r14,#high(2b)\n" \ | |
405 | " or3 r14,r14,#low(2b)\n" \ | |
406 | " jmp r14\n" \ | |
407 | ".previous\n" \ | |
408 | ".section __ex_table,\"a\"\n" \ | |
409 | " .balign 4\n" \ | |
410 | " .long 1b,3b\n" \ | |
411 | ".previous" \ | |
04dfd0de HT |
412 | : "=&r" (err) \ |
413 | : "r" (x), "r" (addr), "i" (-EFAULT), "0" (err) \ | |
1da177e4 LT |
414 | : "r14", "memory") |
415 | ||
416 | /* | |
417 | * Here we special-case 1, 2 and 4-byte copy_*_user invocations. On a fault | |
418 | * we return the initial request size (1, 2 or 4), as copy_*_user should do. | |
419 | * If a store crosses a page boundary and gets a fault, the m32r will not write | |
420 | * anything, so this is accurate. | |
421 | */ | |
422 | ||
1da177e4 LT |
423 | /* |
424 | * Copy To/From Userspace | |
425 | */ | |
426 | ||
427 | /* Generic arbitrary sized copy. */ | |
428 | /* Return the number of bytes NOT copied. */ | |
0ab06604 | 429 | #define __copy_user(to, from, size) \ |
1da177e4 LT |
430 | do { \ |
431 | unsigned long __dst, __src, __c; \ | |
432 | __asm__ __volatile__ ( \ | |
433 | " mv r14, %0\n" \ | |
434 | " or r14, %1\n" \ | |
435 | " beq %0, %1, 9f\n" \ | |
436 | " beqz %2, 9f\n" \ | |
437 | " and3 r14, r14, #3\n" \ | |
438 | " bnez r14, 2f\n" \ | |
439 | " and3 %2, %2, #3\n" \ | |
440 | " beqz %3, 2f\n" \ | |
441 | " addi %0, #-4 ; word_copy \n" \ | |
442 | " .fillinsn\n" \ | |
443 | "0: ld r14, @%1+\n" \ | |
444 | " addi %3, #-1\n" \ | |
445 | " .fillinsn\n" \ | |
446 | "1: st r14, @+%0\n" \ | |
447 | " bnez %3, 0b\n" \ | |
448 | " beqz %2, 9f\n" \ | |
449 | " addi %0, #4\n" \ | |
450 | " .fillinsn\n" \ | |
451 | "2: ldb r14, @%1 ; byte_copy \n" \ | |
452 | " .fillinsn\n" \ | |
453 | "3: stb r14, @%0\n" \ | |
454 | " addi %1, #1\n" \ | |
455 | " addi %2, #-1\n" \ | |
456 | " addi %0, #1\n" \ | |
457 | " bnez %2, 2b\n" \ | |
458 | " .fillinsn\n" \ | |
459 | "9:\n" \ | |
460 | ".section .fixup,\"ax\"\n" \ | |
461 | " .balign 4\n" \ | |
462 | "5: addi %3, #1\n" \ | |
463 | " addi %1, #-4\n" \ | |
464 | " .fillinsn\n" \ | |
465 | "6: slli %3, #2\n" \ | |
466 | " add %2, %3\n" \ | |
467 | " addi %0, #4\n" \ | |
468 | " .fillinsn\n" \ | |
469 | "7: seth r14, #high(9b)\n" \ | |
470 | " or3 r14, r14, #low(9b)\n" \ | |
471 | " jmp r14\n" \ | |
472 | ".previous\n" \ | |
473 | ".section __ex_table,\"a\"\n" \ | |
474 | " .balign 4\n" \ | |
475 | " .long 0b,6b\n" \ | |
476 | " .long 1b,5b\n" \ | |
477 | " .long 2b,9b\n" \ | |
478 | " .long 3b,9b\n" \ | |
479 | ".previous\n" \ | |
04dfd0de HT |
480 | : "=&r" (__dst), "=&r" (__src), "=&r" (size), \ |
481 | "=&r" (__c) \ | |
482 | : "0" (to), "1" (from), "2" (size), "3" (size / 4) \ | |
1da177e4 LT |
483 | : "r14", "memory"); \ |
484 | } while (0) | |
485 | ||
0ab06604 | 486 | #define __copy_user_zeroing(to, from, size) \ |
1da177e4 LT |
487 | do { \ |
488 | unsigned long __dst, __src, __c; \ | |
489 | __asm__ __volatile__ ( \ | |
490 | " mv r14, %0\n" \ | |
491 | " or r14, %1\n" \ | |
492 | " beq %0, %1, 9f\n" \ | |
493 | " beqz %2, 9f\n" \ | |
494 | " and3 r14, r14, #3\n" \ | |
495 | " bnez r14, 2f\n" \ | |
496 | " and3 %2, %2, #3\n" \ | |
497 | " beqz %3, 2f\n" \ | |
498 | " addi %0, #-4 ; word_copy \n" \ | |
499 | " .fillinsn\n" \ | |
500 | "0: ld r14, @%1+\n" \ | |
501 | " addi %3, #-1\n" \ | |
502 | " .fillinsn\n" \ | |
503 | "1: st r14, @+%0\n" \ | |
504 | " bnez %3, 0b\n" \ | |
505 | " beqz %2, 9f\n" \ | |
506 | " addi %0, #4\n" \ | |
507 | " .fillinsn\n" \ | |
508 | "2: ldb r14, @%1 ; byte_copy \n" \ | |
509 | " .fillinsn\n" \ | |
510 | "3: stb r14, @%0\n" \ | |
511 | " addi %1, #1\n" \ | |
512 | " addi %2, #-1\n" \ | |
513 | " addi %0, #1\n" \ | |
514 | " bnez %2, 2b\n" \ | |
515 | " .fillinsn\n" \ | |
516 | "9:\n" \ | |
517 | ".section .fixup,\"ax\"\n" \ | |
518 | " .balign 4\n" \ | |
519 | "5: addi %3, #1\n" \ | |
520 | " addi %1, #-4\n" \ | |
521 | " .fillinsn\n" \ | |
522 | "6: slli %3, #2\n" \ | |
523 | " add %2, %3\n" \ | |
524 | " addi %0, #4\n" \ | |
525 | " .fillinsn\n" \ | |
526 | "7: ldi r14, #0 ; store zero \n" \ | |
527 | " .fillinsn\n" \ | |
528 | "8: addi %2, #-1\n" \ | |
529 | " stb r14, @%0 ; ACE? \n" \ | |
530 | " addi %0, #1\n" \ | |
531 | " bnez %2, 8b\n" \ | |
532 | " seth r14, #high(9b)\n" \ | |
533 | " or3 r14, r14, #low(9b)\n" \ | |
534 | " jmp r14\n" \ | |
535 | ".previous\n" \ | |
536 | ".section __ex_table,\"a\"\n" \ | |
537 | " .balign 4\n" \ | |
538 | " .long 0b,6b\n" \ | |
539 | " .long 1b,5b\n" \ | |
540 | " .long 2b,7b\n" \ | |
541 | " .long 3b,7b\n" \ | |
542 | ".previous\n" \ | |
04dfd0de HT |
543 | : "=&r" (__dst), "=&r" (__src), "=&r" (size), \ |
544 | "=&r" (__c) \ | |
545 | : "0" (to), "1" (from), "2" (size), "3" (size / 4) \ | |
1da177e4 LT |
546 | : "r14", "memory"); \ |
547 | } while (0) | |
548 | ||
549 | ||
550 | /* We let the __ versions of copy_from/to_user inline, because they're often | |
551 | * used in fast paths and have only a small space overhead. | |
552 | */ | |
553 | static inline unsigned long __generic_copy_from_user_nocheck(void *to, | |
554 | const void __user *from, unsigned long n) | |
555 | { | |
0ab06604 | 556 | __copy_user_zeroing(to, from, n); |
1da177e4 LT |
557 | return n; |
558 | } | |
559 | ||
560 | static inline unsigned long __generic_copy_to_user_nocheck(void __user *to, | |
561 | const void *from, unsigned long n) | |
562 | { | |
0ab06604 | 563 | __copy_user(to, from, n); |
1da177e4 LT |
564 | return n; |
565 | } | |
566 | ||
a880948b AV |
567 | unsigned long __generic_copy_to_user(void __user *, const void *, unsigned long); |
568 | unsigned long __generic_copy_from_user(void *, const void __user *, unsigned long); | |
1da177e4 LT |
569 | |
570 | /** | |
571 | * __copy_to_user: - Copy a block of data into user space, with less checking. | |
572 | * @to: Destination address, in user space. | |
573 | * @from: Source address, in kernel space. | |
574 | * @n: Number of bytes to copy. | |
575 | * | |
b3c395ef DH |
576 | * Context: User context only. This function may sleep if pagefaults are |
577 | * enabled. | |
1da177e4 LT |
578 | * |
579 | * Copy data from kernel space to user space. Caller must check | |
580 | * the specified block with access_ok() before calling this function. | |
581 | * | |
582 | * Returns number of bytes that could not be copied. | |
583 | * On success, this will be zero. | |
584 | */ | |
0ab06604 MT |
585 | #define __copy_to_user(to, from, n) \ |
586 | __generic_copy_to_user_nocheck((to), (from), (n)) | |
1da177e4 LT |
587 | |
588 | #define __copy_to_user_inatomic __copy_to_user | |
589 | #define __copy_from_user_inatomic __copy_from_user | |
590 | ||
591 | /** | |
592 | * copy_to_user: - Copy a block of data into user space. | |
593 | * @to: Destination address, in user space. | |
594 | * @from: Source address, in kernel space. | |
595 | * @n: Number of bytes to copy. | |
596 | * | |
b3c395ef DH |
597 | * Context: User context only. This function may sleep if pagefaults are |
598 | * enabled. | |
1da177e4 LT |
599 | * |
600 | * Copy data from kernel space to user space. | |
601 | * | |
602 | * Returns number of bytes that could not be copied. | |
603 | * On success, this will be zero. | |
604 | */ | |
0ab06604 | 605 | #define copy_to_user(to, from, n) \ |
1da177e4 | 606 | ({ \ |
01682576 | 607 | might_fault(); \ |
0ab06604 | 608 | __generic_copy_to_user((to), (from), (n)); \ |
1da177e4 LT |
609 | }) |
610 | ||
611 | /** | |
612 | * __copy_from_user: - Copy a block of data from user space, with less checking. * @to: Destination address, in kernel space. | |
613 | * @from: Source address, in user space. | |
614 | * @n: Number of bytes to copy. | |
615 | * | |
b3c395ef DH |
616 | * Context: User context only. This function may sleep if pagefaults are |
617 | * enabled. | |
1da177e4 LT |
618 | * |
619 | * Copy data from user space to kernel space. Caller must check | |
620 | * the specified block with access_ok() before calling this function. | |
621 | * | |
622 | * Returns number of bytes that could not be copied. | |
623 | * On success, this will be zero. | |
624 | * | |
625 | * If some data could not be copied, this function will pad the copied | |
626 | * data to the requested size using zero bytes. | |
627 | */ | |
0ab06604 MT |
628 | #define __copy_from_user(to, from, n) \ |
629 | __generic_copy_from_user_nocheck((to), (from), (n)) | |
1da177e4 LT |
630 | |
631 | /** | |
632 | * copy_from_user: - Copy a block of data from user space. | |
633 | * @to: Destination address, in kernel space. | |
634 | * @from: Source address, in user space. | |
635 | * @n: Number of bytes to copy. | |
636 | * | |
b3c395ef DH |
637 | * Context: User context only. This function may sleep if pagefaults are |
638 | * enabled. | |
1da177e4 LT |
639 | * |
640 | * Copy data from user space to kernel space. | |
641 | * | |
642 | * Returns number of bytes that could not be copied. | |
643 | * On success, this will be zero. | |
644 | * | |
645 | * If some data could not be copied, this function will pad the copied | |
646 | * data to the requested size using zero bytes. | |
647 | */ | |
0ab06604 | 648 | #define copy_from_user(to, from, n) \ |
1da177e4 | 649 | ({ \ |
01682576 | 650 | might_fault(); \ |
0ab06604 | 651 | __generic_copy_from_user((to), (from), (n)); \ |
1da177e4 LT |
652 | }) |
653 | ||
654 | long __must_check strncpy_from_user(char *dst, const char __user *src, | |
655 | long count); | |
656 | long __must_check __strncpy_from_user(char *dst, | |
657 | const char __user *src, long count); | |
658 | ||
659 | /** | |
660 | * __clear_user: - Zero a block of memory in user space, with less checking. | |
661 | * @to: Destination address, in user space. | |
662 | * @n: Number of bytes to zero. | |
663 | * | |
664 | * Zero a block of memory in user space. Caller must check | |
665 | * the specified block with access_ok() before calling this function. | |
666 | * | |
667 | * Returns number of bytes that could not be cleared. | |
668 | * On success, this will be zero. | |
669 | */ | |
670 | unsigned long __clear_user(void __user *mem, unsigned long len); | |
671 | ||
672 | /** | |
673 | * clear_user: - Zero a block of memory in user space. | |
674 | * @to: Destination address, in user space. | |
675 | * @n: Number of bytes to zero. | |
676 | * | |
677 | * Zero a block of memory in user space. Caller must check | |
678 | * the specified block with access_ok() before calling this function. | |
679 | * | |
680 | * Returns number of bytes that could not be cleared. | |
681 | * On success, this will be zero. | |
682 | */ | |
683 | unsigned long clear_user(void __user *mem, unsigned long len); | |
684 | ||
685 | /** | |
686 | * strlen_user: - Get the size of a string in user space. | |
687 | * @str: The string to measure. | |
688 | * | |
b3c395ef DH |
689 | * Context: User context only. This function may sleep if pagefaults are |
690 | * enabled. | |
1da177e4 LT |
691 | * |
692 | * Get the size of a NUL-terminated string in user space. | |
693 | * | |
694 | * Returns the size of the string INCLUDING the terminating NUL. | |
695 | * On exception, returns 0. | |
696 | * | |
697 | * If there is a limit on the length of a valid string, you may wish to | |
698 | * consider using strnlen_user() instead. | |
699 | */ | |
700 | #define strlen_user(str) strnlen_user(str, ~0UL >> 1) | |
701 | long strnlen_user(const char __user *str, long n); | |
702 | ||
703 | #endif /* _ASM_M32R_UACCESS_H */ |