diff options
Diffstat (limited to 'arch/m32r/include/asm/uaccess.h')
-rw-r--r-- | arch/m32r/include/asm/uaccess.h | 693 |
1 files changed, 693 insertions, 0 deletions
diff --git a/arch/m32r/include/asm/uaccess.h b/arch/m32r/include/asm/uaccess.h new file mode 100644 index 000000000000..1c7047bea200 --- /dev/null +++ b/arch/m32r/include/asm/uaccess.h | |||
@@ -0,0 +1,693 @@ | |||
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. | ||
8 | * Copyright (C) 2004, 2006 Hirokazu Takata <takata at linux-m32r.org> | ||
9 | */ | ||
10 | |||
11 | /* | ||
12 | * User space memory access functions | ||
13 | */ | ||
14 | #include <linux/errno.h> | ||
15 | #include <linux/thread_info.h> | ||
16 | #include <asm/page.h> | ||
17 | #include <asm/setup.h> | ||
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 | ||
33 | |||
34 | #define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFF) | ||
35 | #define USER_DS MAKE_MM_SEG(PAGE_OFFSET) | ||
36 | #define get_ds() (KERNEL_DS) | ||
37 | #define get_fs() (current_thread_info()->addr_limit) | ||
38 | #define set_fs(x) (current_thread_info()->addr_limit = (x)) | ||
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 | |||
46 | static inline mm_segment_t get_fs(void) | ||
47 | { | ||
48 | return USER_DS; | ||
49 | } | ||
50 | |||
51 | static inline void set_fs(mm_segment_t s) | ||
52 | { | ||
53 | } | ||
54 | |||
55 | #endif /* not CONFIG_MMU */ | ||
56 | |||
57 | #define segment_eq(a,b) ((a).seg == (b).seg) | ||
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 | */ | ||
71 | #define __range_ok(addr,size) ({ \ | ||
72 | unsigned long flag, roksum; \ | ||
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" \ | ||
80 | : "=&r" (flag), "=r" (roksum) \ | ||
81 | : "1" (addr), "r" ((int)(size)), \ | ||
82 | "r" (current_thread_info()->addr_limit.seg), "r" (0) \ | ||
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 | * | ||
94 | * Context: User context only. This function may sleep. | ||
95 | * | ||
96 | * Checks if a pointer to a block of memory in user space is valid. | ||
97 | * | ||
98 | * Returns true (nonzero) if the memory block may be valid, false (zero) | ||
99 | * if it is definitely invalid. | ||
100 | * | ||
101 | * Note that, depending on architecture, this function probably just | ||
102 | * checks that the pointer is in the user space range - after calling | ||
103 | * this function, memory access functions may still return -EFAULT. | ||
104 | */ | ||
105 | #ifdef CONFIG_MMU | ||
106 | #define access_ok(type,addr,size) (likely(__range_ok(addr,size) == 0)) | ||
107 | #else | ||
108 | static inline int access_ok(int type, const void *addr, unsigned long size) | ||
109 | { | ||
110 | unsigned long val = (unsigned long)addr; | ||
111 | |||
112 | return ((val >= memory_start) && ((val + size) < memory_end)); | ||
113 | } | ||
114 | #endif /* CONFIG_MMU */ | ||
115 | |||
116 | /* | ||
117 | * The exception table consists of pairs of addresses: the first is the | ||
118 | * address of an instruction that is allowed to fault, and the second is | ||
119 | * the address at which the program should continue. No registers are | ||
120 | * modified, so it is entirely up to the continuation code to figure out | ||
121 | * what to do. | ||
122 | * | ||
123 | * All the routines below use bits of fixup code that are out of line | ||
124 | * with the main instruction path. This means when everything is well, | ||
125 | * we don't even have to jump over them. Further, they do not intrude | ||
126 | * on our cache or tlb entries. | ||
127 | */ | ||
128 | |||
129 | struct exception_table_entry | ||
130 | { | ||
131 | unsigned long insn, fixup; | ||
132 | }; | ||
133 | |||
134 | extern int fixup_exception(struct pt_regs *regs); | ||
135 | |||
136 | /* | ||
137 | * These are the main single-value transfer routines. They automatically | ||
138 | * use the right size if we just have the right pointer type. | ||
139 | * | ||
140 | * This gets kind of ugly. We want to return _two_ values in "get_user()" | ||
141 | * and yet we don't want to do any pointers, because that is too much | ||
142 | * of a performance impact. Thus we have a few rather ugly macros here, | ||
143 | * and hide all the uglyness from the user. | ||
144 | * | ||
145 | * The "__xxx" versions of the user access functions are versions that | ||
146 | * do not verify the address space, that must have been done previously | ||
147 | * with a separate "access_ok()" call (this is used when we do multiple | ||
148 | * accesses to the same area of user memory). | ||
149 | */ | ||
150 | |||
151 | /* Careful: we have to cast the result to the type of the pointer for sign | ||
152 | reasons */ | ||
153 | /** | ||
154 | * get_user: - Get a simple variable from user space. | ||
155 | * @x: Variable to store result. | ||
156 | * @ptr: Source address, in user space. | ||
157 | * | ||
158 | * Context: User context only. This function may sleep. | ||
159 | * | ||
160 | * This macro copies a single simple variable from user space to kernel | ||
161 | * space. It supports simple types like char and int, but not larger | ||
162 | * data types like structures or arrays. | ||
163 | * | ||
164 | * @ptr must have pointer-to-simple-variable type, and the result of | ||
165 | * dereferencing @ptr must be assignable to @x without a cast. | ||
166 | * | ||
167 | * Returns zero on success, or -EFAULT on error. | ||
168 | * On error, the variable @x is set to zero. | ||
169 | */ | ||
170 | #define get_user(x,ptr) \ | ||
171 | __get_user_check((x),(ptr),sizeof(*(ptr))) | ||
172 | |||
173 | /** | ||
174 | * put_user: - Write a simple value into user space. | ||
175 | * @x: Value to copy to user space. | ||
176 | * @ptr: Destination address, in user space. | ||
177 | * | ||
178 | * Context: User context only. This function may sleep. | ||
179 | * | ||
180 | * This macro copies a single simple value from kernel space to user | ||
181 | * space. It supports simple types like char and int, but not larger | ||
182 | * data types like structures or arrays. | ||
183 | * | ||
184 | * @ptr must have pointer-to-simple-variable type, and @x must be assignable | ||
185 | * to the result of dereferencing @ptr. | ||
186 | * | ||
187 | * Returns zero on success, or -EFAULT on error. | ||
188 | */ | ||
189 | #define put_user(x,ptr) \ | ||
190 | __put_user_check((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr))) | ||
191 | |||
192 | /** | ||
193 | * __get_user: - Get a simple variable from user space, with less checking. | ||
194 | * @x: Variable to store result. | ||
195 | * @ptr: Source address, in user space. | ||
196 | * | ||
197 | * Context: User context only. This function may sleep. | ||
198 | * | ||
199 | * This macro copies a single simple variable from user space to kernel | ||
200 | * space. It supports simple types like char and int, but not larger | ||
201 | * data types like structures or arrays. | ||
202 | * | ||
203 | * @ptr must have pointer-to-simple-variable type, and the result of | ||
204 | * dereferencing @ptr must be assignable to @x without a cast. | ||
205 | * | ||
206 | * Caller must check the pointer with access_ok() before calling this | ||
207 | * function. | ||
208 | * | ||
209 | * Returns zero on success, or -EFAULT on error. | ||
210 | * On error, the variable @x is set to zero. | ||
211 | */ | ||
212 | #define __get_user(x,ptr) \ | ||
213 | __get_user_nocheck((x),(ptr),sizeof(*(ptr))) | ||
214 | |||
215 | #define __get_user_nocheck(x,ptr,size) \ | ||
216 | ({ \ | ||
217 | long __gu_err = 0; \ | ||
218 | unsigned long __gu_val; \ | ||
219 | might_sleep(); \ | ||
220 | __get_user_size(__gu_val,(ptr),(size),__gu_err); \ | ||
221 | (x) = (__typeof__(*(ptr)))__gu_val; \ | ||
222 | __gu_err; \ | ||
223 | }) | ||
224 | |||
225 | #define __get_user_check(x,ptr,size) \ | ||
226 | ({ \ | ||
227 | long __gu_err = -EFAULT; \ | ||
228 | unsigned long __gu_val = 0; \ | ||
229 | const __typeof__(*(ptr)) __user *__gu_addr = (ptr); \ | ||
230 | might_sleep(); \ | ||
231 | if (access_ok(VERIFY_READ,__gu_addr,size)) \ | ||
232 | __get_user_size(__gu_val,__gu_addr,(size),__gu_err); \ | ||
233 | (x) = (__typeof__(*(ptr)))__gu_val; \ | ||
234 | __gu_err; \ | ||
235 | }) | ||
236 | |||
237 | extern long __get_user_bad(void); | ||
238 | |||
239 | #define __get_user_size(x,ptr,size,retval) \ | ||
240 | do { \ | ||
241 | retval = 0; \ | ||
242 | __chk_user_ptr(ptr); \ | ||
243 | switch (size) { \ | ||
244 | case 1: __get_user_asm(x,ptr,retval,"ub"); break; \ | ||
245 | case 2: __get_user_asm(x,ptr,retval,"uh"); break; \ | ||
246 | case 4: __get_user_asm(x,ptr,retval,""); break; \ | ||
247 | default: (x) = __get_user_bad(); \ | ||
248 | } \ | ||
249 | } while (0) | ||
250 | |||
251 | #define __get_user_asm(x, addr, err, itype) \ | ||
252 | __asm__ __volatile__( \ | ||
253 | " .fillinsn\n" \ | ||
254 | "1: ld"itype" %1,@%2\n" \ | ||
255 | " .fillinsn\n" \ | ||
256 | "2:\n" \ | ||
257 | ".section .fixup,\"ax\"\n" \ | ||
258 | " .balign 4\n" \ | ||
259 | "3: ldi %0,%3\n" \ | ||
260 | " seth r14,#high(2b)\n" \ | ||
261 | " or3 r14,r14,#low(2b)\n" \ | ||
262 | " jmp r14\n" \ | ||
263 | ".previous\n" \ | ||
264 | ".section __ex_table,\"a\"\n" \ | ||
265 | " .balign 4\n" \ | ||
266 | " .long 1b,3b\n" \ | ||
267 | ".previous" \ | ||
268 | : "=&r" (err), "=&r" (x) \ | ||
269 | : "r" (addr), "i" (-EFAULT), "0" (err) \ | ||
270 | : "r14", "memory") | ||
271 | |||
272 | /** | ||
273 | * __put_user: - Write a simple value into user space, with less checking. | ||
274 | * @x: Value to copy to user space. | ||
275 | * @ptr: Destination address, in user space. | ||
276 | * | ||
277 | * Context: User context only. This function may sleep. | ||
278 | * | ||
279 | * This macro copies a single simple value from kernel space to user | ||
280 | * space. It supports simple types like char and int, but not larger | ||
281 | * data types like structures or arrays. | ||
282 | * | ||
283 | * @ptr must have pointer-to-simple-variable type, and @x must be assignable | ||
284 | * to the result of dereferencing @ptr. | ||
285 | * | ||
286 | * Caller must check the pointer with access_ok() before calling this | ||
287 | * function. | ||
288 | * | ||
289 | * Returns zero on success, or -EFAULT on error. | ||
290 | */ | ||
291 | #define __put_user(x,ptr) \ | ||
292 | __put_user_nocheck((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr))) | ||
293 | |||
294 | |||
295 | #define __put_user_nocheck(x,ptr,size) \ | ||
296 | ({ \ | ||
297 | long __pu_err; \ | ||
298 | might_sleep(); \ | ||
299 | __put_user_size((x),(ptr),(size),__pu_err); \ | ||
300 | __pu_err; \ | ||
301 | }) | ||
302 | |||
303 | |||
304 | #define __put_user_check(x,ptr,size) \ | ||
305 | ({ \ | ||
306 | long __pu_err = -EFAULT; \ | ||
307 | __typeof__(*(ptr)) __user *__pu_addr = (ptr); \ | ||
308 | might_sleep(); \ | ||
309 | if (access_ok(VERIFY_WRITE,__pu_addr,size)) \ | ||
310 | __put_user_size((x),__pu_addr,(size),__pu_err); \ | ||
311 | __pu_err; \ | ||
312 | }) | ||
313 | |||
314 | #if defined(__LITTLE_ENDIAN__) | ||
315 | #define __put_user_u64(x, addr, err) \ | ||
316 | __asm__ __volatile__( \ | ||
317 | " .fillinsn\n" \ | ||
318 | "1: st %L1,@%2\n" \ | ||
319 | " .fillinsn\n" \ | ||
320 | "2: st %H1,@(4,%2)\n" \ | ||
321 | " .fillinsn\n" \ | ||
322 | "3:\n" \ | ||
323 | ".section .fixup,\"ax\"\n" \ | ||
324 | " .balign 4\n" \ | ||
325 | "4: ldi %0,%3\n" \ | ||
326 | " seth r14,#high(3b)\n" \ | ||
327 | " or3 r14,r14,#low(3b)\n" \ | ||
328 | " jmp r14\n" \ | ||
329 | ".previous\n" \ | ||
330 | ".section __ex_table,\"a\"\n" \ | ||
331 | " .balign 4\n" \ | ||
332 | " .long 1b,4b\n" \ | ||
333 | " .long 2b,4b\n" \ | ||
334 | ".previous" \ | ||
335 | : "=&r" (err) \ | ||
336 | : "r" (x), "r" (addr), "i" (-EFAULT), "0" (err) \ | ||
337 | : "r14", "memory") | ||
338 | |||
339 | #elif defined(__BIG_ENDIAN__) | ||
340 | #define __put_user_u64(x, addr, err) \ | ||
341 | __asm__ __volatile__( \ | ||
342 | " .fillinsn\n" \ | ||
343 | "1: st %H1,@%2\n" \ | ||
344 | " .fillinsn\n" \ | ||
345 | "2: st %L1,@(4,%2)\n" \ | ||
346 | " .fillinsn\n" \ | ||
347 | "3:\n" \ | ||
348 | ".section .fixup,\"ax\"\n" \ | ||
349 | " .balign 4\n" \ | ||
350 | "4: ldi %0,%3\n" \ | ||
351 | " seth r14,#high(3b)\n" \ | ||
352 | " or3 r14,r14,#low(3b)\n" \ | ||
353 | " jmp r14\n" \ | ||
354 | ".previous\n" \ | ||
355 | ".section __ex_table,\"a\"\n" \ | ||
356 | " .balign 4\n" \ | ||
357 | " .long 1b,4b\n" \ | ||
358 | " .long 2b,4b\n" \ | ||
359 | ".previous" \ | ||
360 | : "=&r" (err) \ | ||
361 | : "r" (x), "r" (addr), "i" (-EFAULT), "0" (err) \ | ||
362 | : "r14", "memory") | ||
363 | #else | ||
364 | #error no endian defined | ||
365 | #endif | ||
366 | |||
367 | extern void __put_user_bad(void); | ||
368 | |||
369 | #define __put_user_size(x,ptr,size,retval) \ | ||
370 | do { \ | ||
371 | retval = 0; \ | ||
372 | __chk_user_ptr(ptr); \ | ||
373 | switch (size) { \ | ||
374 | case 1: __put_user_asm(x,ptr,retval,"b"); break; \ | ||
375 | case 2: __put_user_asm(x,ptr,retval,"h"); break; \ | ||
376 | case 4: __put_user_asm(x,ptr,retval,""); break; \ | ||
377 | case 8: __put_user_u64((__typeof__(*ptr))(x),ptr,retval); break;\ | ||
378 | default: __put_user_bad(); \ | ||
379 | } \ | ||
380 | } while (0) | ||
381 | |||
382 | struct __large_struct { unsigned long buf[100]; }; | ||
383 | #define __m(x) (*(struct __large_struct *)(x)) | ||
384 | |||
385 | /* | ||
386 | * Tell gcc we read from memory instead of writing: this is because | ||
387 | * we do not write to any memory gcc knows about, so there are no | ||
388 | * aliasing issues. | ||
389 | */ | ||
390 | #define __put_user_asm(x, addr, err, itype) \ | ||
391 | __asm__ __volatile__( \ | ||
392 | " .fillinsn\n" \ | ||
393 | "1: st"itype" %1,@%2\n" \ | ||
394 | " .fillinsn\n" \ | ||
395 | "2:\n" \ | ||
396 | ".section .fixup,\"ax\"\n" \ | ||
397 | " .balign 4\n" \ | ||
398 | "3: ldi %0,%3\n" \ | ||
399 | " seth r14,#high(2b)\n" \ | ||
400 | " or3 r14,r14,#low(2b)\n" \ | ||
401 | " jmp r14\n" \ | ||
402 | ".previous\n" \ | ||
403 | ".section __ex_table,\"a\"\n" \ | ||
404 | " .balign 4\n" \ | ||
405 | " .long 1b,3b\n" \ | ||
406 | ".previous" \ | ||
407 | : "=&r" (err) \ | ||
408 | : "r" (x), "r" (addr), "i" (-EFAULT), "0" (err) \ | ||
409 | : "r14", "memory") | ||
410 | |||
411 | /* | ||
412 | * Here we special-case 1, 2 and 4-byte copy_*_user invocations. On a fault | ||
413 | * we return the initial request size (1, 2 or 4), as copy_*_user should do. | ||
414 | * If a store crosses a page boundary and gets a fault, the m32r will not write | ||
415 | * anything, so this is accurate. | ||
416 | */ | ||
417 | |||
418 | /* | ||
419 | * Copy To/From Userspace | ||
420 | */ | ||
421 | |||
422 | /* Generic arbitrary sized copy. */ | ||
423 | /* Return the number of bytes NOT copied. */ | ||
424 | #define __copy_user(to,from,size) \ | ||
425 | do { \ | ||
426 | unsigned long __dst, __src, __c; \ | ||
427 | __asm__ __volatile__ ( \ | ||
428 | " mv r14, %0\n" \ | ||
429 | " or r14, %1\n" \ | ||
430 | " beq %0, %1, 9f\n" \ | ||
431 | " beqz %2, 9f\n" \ | ||
432 | " and3 r14, r14, #3\n" \ | ||
433 | " bnez r14, 2f\n" \ | ||
434 | " and3 %2, %2, #3\n" \ | ||
435 | " beqz %3, 2f\n" \ | ||
436 | " addi %0, #-4 ; word_copy \n" \ | ||
437 | " .fillinsn\n" \ | ||
438 | "0: ld r14, @%1+\n" \ | ||
439 | " addi %3, #-1\n" \ | ||
440 | " .fillinsn\n" \ | ||
441 | "1: st r14, @+%0\n" \ | ||
442 | " bnez %3, 0b\n" \ | ||
443 | " beqz %2, 9f\n" \ | ||
444 | " addi %0, #4\n" \ | ||
445 | " .fillinsn\n" \ | ||
446 | "2: ldb r14, @%1 ; byte_copy \n" \ | ||
447 | " .fillinsn\n" \ | ||
448 | "3: stb r14, @%0\n" \ | ||
449 | " addi %1, #1\n" \ | ||
450 | " addi %2, #-1\n" \ | ||
451 | " addi %0, #1\n" \ | ||
452 | " bnez %2, 2b\n" \ | ||
453 | " .fillinsn\n" \ | ||
454 | "9:\n" \ | ||
455 | ".section .fixup,\"ax\"\n" \ | ||
456 | " .balign 4\n" \ | ||
457 | "5: addi %3, #1\n" \ | ||
458 | " addi %1, #-4\n" \ | ||
459 | " .fillinsn\n" \ | ||
460 | "6: slli %3, #2\n" \ | ||
461 | " add %2, %3\n" \ | ||
462 | " addi %0, #4\n" \ | ||
463 | " .fillinsn\n" \ | ||
464 | "7: seth r14, #high(9b)\n" \ | ||
465 | " or3 r14, r14, #low(9b)\n" \ | ||
466 | " jmp r14\n" \ | ||
467 | ".previous\n" \ | ||
468 | ".section __ex_table,\"a\"\n" \ | ||
469 | " .balign 4\n" \ | ||
470 | " .long 0b,6b\n" \ | ||
471 | " .long 1b,5b\n" \ | ||
472 | " .long 2b,9b\n" \ | ||
473 | " .long 3b,9b\n" \ | ||
474 | ".previous\n" \ | ||
475 | : "=&r" (__dst), "=&r" (__src), "=&r" (size), \ | ||
476 | "=&r" (__c) \ | ||
477 | : "0" (to), "1" (from), "2" (size), "3" (size / 4) \ | ||
478 | : "r14", "memory"); \ | ||
479 | } while (0) | ||
480 | |||
481 | #define __copy_user_zeroing(to,from,size) \ | ||
482 | do { \ | ||
483 | unsigned long __dst, __src, __c; \ | ||
484 | __asm__ __volatile__ ( \ | ||
485 | " mv r14, %0\n" \ | ||
486 | " or r14, %1\n" \ | ||
487 | " beq %0, %1, 9f\n" \ | ||
488 | " beqz %2, 9f\n" \ | ||
489 | " and3 r14, r14, #3\n" \ | ||
490 | " bnez r14, 2f\n" \ | ||
491 | " and3 %2, %2, #3\n" \ | ||
492 | " beqz %3, 2f\n" \ | ||
493 | " addi %0, #-4 ; word_copy \n" \ | ||
494 | " .fillinsn\n" \ | ||
495 | "0: ld r14, @%1+\n" \ | ||
496 | " addi %3, #-1\n" \ | ||
497 | " .fillinsn\n" \ | ||
498 | "1: st r14, @+%0\n" \ | ||
499 | " bnez %3, 0b\n" \ | ||
500 | " beqz %2, 9f\n" \ | ||
501 | " addi %0, #4\n" \ | ||
502 | " .fillinsn\n" \ | ||
503 | "2: ldb r14, @%1 ; byte_copy \n" \ | ||
504 | " .fillinsn\n" \ | ||
505 | "3: stb r14, @%0\n" \ | ||
506 | " addi %1, #1\n" \ | ||
507 | " addi %2, #-1\n" \ | ||
508 | " addi %0, #1\n" \ | ||
509 | " bnez %2, 2b\n" \ | ||
510 | " .fillinsn\n" \ | ||
511 | "9:\n" \ | ||
512 | ".section .fixup,\"ax\"\n" \ | ||
513 | " .balign 4\n" \ | ||
514 | "5: addi %3, #1\n" \ | ||
515 | " addi %1, #-4\n" \ | ||
516 | " .fillinsn\n" \ | ||
517 | "6: slli %3, #2\n" \ | ||
518 | " add %2, %3\n" \ | ||
519 | " addi %0, #4\n" \ | ||
520 | " .fillinsn\n" \ | ||
521 | "7: ldi r14, #0 ; store zero \n" \ | ||
522 | " .fillinsn\n" \ | ||
523 | "8: addi %2, #-1\n" \ | ||
524 | " stb r14, @%0 ; ACE? \n" \ | ||
525 | " addi %0, #1\n" \ | ||
526 | " bnez %2, 8b\n" \ | ||
527 | " seth r14, #high(9b)\n" \ | ||
528 | " or3 r14, r14, #low(9b)\n" \ | ||
529 | " jmp r14\n" \ | ||
530 | ".previous\n" \ | ||
531 | ".section __ex_table,\"a\"\n" \ | ||
532 | " .balign 4\n" \ | ||
533 | " .long 0b,6b\n" \ | ||
534 | " .long 1b,5b\n" \ | ||
535 | " .long 2b,7b\n" \ | ||
536 | " .long 3b,7b\n" \ | ||
537 | ".previous\n" \ | ||
538 | : "=&r" (__dst), "=&r" (__src), "=&r" (size), \ | ||
539 | "=&r" (__c) \ | ||
540 | : "0" (to), "1" (from), "2" (size), "3" (size / 4) \ | ||
541 | : "r14", "memory"); \ | ||
542 | } while (0) | ||
543 | |||
544 | |||
545 | /* We let the __ versions of copy_from/to_user inline, because they're often | ||
546 | * used in fast paths and have only a small space overhead. | ||
547 | */ | ||
548 | static inline unsigned long __generic_copy_from_user_nocheck(void *to, | ||
549 | const void __user *from, unsigned long n) | ||
550 | { | ||
551 | __copy_user_zeroing(to,from,n); | ||
552 | return n; | ||
553 | } | ||
554 | |||
555 | static inline unsigned long __generic_copy_to_user_nocheck(void __user *to, | ||
556 | const void *from, unsigned long n) | ||
557 | { | ||
558 | __copy_user(to,from,n); | ||
559 | return n; | ||
560 | } | ||
561 | |||
562 | unsigned long __generic_copy_to_user(void __user *, const void *, unsigned long); | ||
563 | unsigned long __generic_copy_from_user(void *, const void __user *, unsigned long); | ||
564 | |||
565 | /** | ||
566 | * __copy_to_user: - Copy a block of data into user space, with less checking. | ||
567 | * @to: Destination address, in user space. | ||
568 | * @from: Source address, in kernel space. | ||
569 | * @n: Number of bytes to copy. | ||
570 | * | ||
571 | * Context: User context only. This function may sleep. | ||
572 | * | ||
573 | * Copy data from kernel space to user space. Caller must check | ||
574 | * the specified block with access_ok() before calling this function. | ||
575 | * | ||
576 | * Returns number of bytes that could not be copied. | ||
577 | * On success, this will be zero. | ||
578 | */ | ||
579 | #define __copy_to_user(to,from,n) \ | ||
580 | __generic_copy_to_user_nocheck((to),(from),(n)) | ||
581 | |||
582 | #define __copy_to_user_inatomic __copy_to_user | ||
583 | #define __copy_from_user_inatomic __copy_from_user | ||
584 | |||
585 | /** | ||
586 | * copy_to_user: - Copy a block of data into user space. | ||
587 | * @to: Destination address, in user space. | ||
588 | * @from: Source address, in kernel space. | ||
589 | * @n: Number of bytes to copy. | ||
590 | * | ||
591 | * Context: User context only. This function may sleep. | ||
592 | * | ||
593 | * Copy data from kernel space to user space. | ||
594 | * | ||
595 | * Returns number of bytes that could not be copied. | ||
596 | * On success, this will be zero. | ||
597 | */ | ||
598 | #define copy_to_user(to,from,n) \ | ||
599 | ({ \ | ||
600 | might_sleep(); \ | ||
601 | __generic_copy_to_user((to),(from),(n)); \ | ||
602 | }) | ||
603 | |||
604 | /** | ||
605 | * __copy_from_user: - Copy a block of data from user space, with less checking. * @to: Destination address, in kernel space. | ||
606 | * @from: Source address, in user space. | ||
607 | * @n: Number of bytes to copy. | ||
608 | * | ||
609 | * Context: User context only. This function may sleep. | ||
610 | * | ||
611 | * Copy data from user space to kernel space. Caller must check | ||
612 | * the specified block with access_ok() before calling this function. | ||
613 | * | ||
614 | * Returns number of bytes that could not be copied. | ||
615 | * On success, this will be zero. | ||
616 | * | ||
617 | * If some data could not be copied, this function will pad the copied | ||
618 | * data to the requested size using zero bytes. | ||
619 | */ | ||
620 | #define __copy_from_user(to,from,n) \ | ||
621 | __generic_copy_from_user_nocheck((to),(from),(n)) | ||
622 | |||
623 | /** | ||
624 | * copy_from_user: - Copy a block of data from user space. | ||
625 | * @to: Destination address, in kernel space. | ||
626 | * @from: Source address, in user space. | ||
627 | * @n: Number of bytes to copy. | ||
628 | * | ||
629 | * Context: User context only. This function may sleep. | ||
630 | * | ||
631 | * Copy data from user space to kernel space. | ||
632 | * | ||
633 | * Returns number of bytes that could not be copied. | ||
634 | * On success, this will be zero. | ||
635 | * | ||
636 | * If some data could not be copied, this function will pad the copied | ||
637 | * data to the requested size using zero bytes. | ||
638 | */ | ||
639 | #define copy_from_user(to,from,n) \ | ||
640 | ({ \ | ||
641 | might_sleep(); \ | ||
642 | __generic_copy_from_user((to),(from),(n)); \ | ||
643 | }) | ||
644 | |||
645 | long __must_check strncpy_from_user(char *dst, const char __user *src, | ||
646 | long count); | ||
647 | long __must_check __strncpy_from_user(char *dst, | ||
648 | const char __user *src, long count); | ||
649 | |||
650 | /** | ||
651 | * __clear_user: - Zero a block of memory in user space, with less checking. | ||
652 | * @to: Destination address, in user space. | ||
653 | * @n: Number of bytes to zero. | ||
654 | * | ||
655 | * Zero a block of memory in user space. Caller must check | ||
656 | * the specified block with access_ok() before calling this function. | ||
657 | * | ||
658 | * Returns number of bytes that could not be cleared. | ||
659 | * On success, this will be zero. | ||
660 | */ | ||
661 | unsigned long __clear_user(void __user *mem, unsigned long len); | ||
662 | |||
663 | /** | ||
664 | * clear_user: - Zero a block of memory in user space. | ||
665 | * @to: Destination address, in user space. | ||
666 | * @n: Number of bytes to zero. | ||
667 | * | ||
668 | * Zero a block of memory in user space. Caller must check | ||
669 | * the specified block with access_ok() before calling this function. | ||
670 | * | ||
671 | * Returns number of bytes that could not be cleared. | ||
672 | * On success, this will be zero. | ||
673 | */ | ||
674 | unsigned long clear_user(void __user *mem, unsigned long len); | ||
675 | |||
676 | /** | ||
677 | * strlen_user: - Get the size of a string in user space. | ||
678 | * @str: The string to measure. | ||
679 | * | ||
680 | * Context: User context only. This function may sleep. | ||
681 | * | ||
682 | * Get the size of a NUL-terminated string in user space. | ||
683 | * | ||
684 | * Returns the size of the string INCLUDING the terminating NUL. | ||
685 | * On exception, returns 0. | ||
686 | * | ||
687 | * If there is a limit on the length of a valid string, you may wish to | ||
688 | * consider using strnlen_user() instead. | ||
689 | */ | ||
690 | #define strlen_user(str) strnlen_user(str, ~0UL >> 1) | ||
691 | long strnlen_user(const char __user *str, long n); | ||
692 | |||
693 | #endif /* _ASM_M32R_UACCESS_H */ | ||