]>
git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - include/asm-sparc/uaccess.h
1 /* $Id: uaccess.h,v 1.24 2001/10/30 04:32:24 davem Exp $
2 * uaccess.h: User space memore access functions.
4 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
5 * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
11 #include <linux/compiler.h>
12 #include <linux/sched.h>
13 #include <linux/string.h>
14 #include <linux/errno.h>
15 #include <asm/vac-ops.h>
16 #include <asm/a.out.h>
21 /* Sparc is not segmented, however we need to be able to fool access_ok()
22 * when doing system calls from kernel mode legitimately.
24 * "For historical reasons, these macros are grossly misnamed." -Linus
27 #define KERNEL_DS ((mm_segment_t) { 0 })
28 #define USER_DS ((mm_segment_t) { -1 })
31 #define VERIFY_WRITE 1
33 #define get_ds() (KERNEL_DS)
34 #define get_fs() (current->thread.current_ds)
35 #define set_fs(val) ((current->thread.current_ds) = (val))
37 #define segment_eq(a,b) ((a).seg == (b).seg)
39 /* We have there a nice not-mapped page at PAGE_OFFSET - PAGE_SIZE, so that this test
40 * can be fairly lightweight.
41 * No one can read/write anything from userland in the kernel space by setting
42 * large size and address near to PAGE_OFFSET - a fault will break his intentions.
44 #define __user_ok(addr, size) ({ (void)(size); (addr) < STACK_TOP; })
45 #define __kernel_ok (segment_eq(get_fs(), KERNEL_DS))
46 #define __access_ok(addr,size) (__user_ok((addr) & get_fs().seg,(size)))
47 #define access_ok(type, addr, size) \
48 ({ (void)(type); __access_ok((unsigned long)(addr), size); })
50 /* this function will go away soon - use access_ok() instead */
51 static inline int __deprecated
verify_area(int type
, const void __user
* addr
, unsigned long size
)
53 return access_ok(type
,addr
,size
) ? 0 : -EFAULT
;
57 * The exception table consists of pairs of addresses: the first is the
58 * address of an instruction that is allowed to fault, and the second is
59 * the address at which the program should continue. No registers are
60 * modified, so it is entirely up to the continuation code to figure out
63 * All the routines below use bits of fixup code that are out of line
64 * with the main instruction path. This means when everything is well,
65 * we don't even have to jump over them. Further, they do not intrude
66 * on our cache or tlb entries.
68 * There is a special way how to put a range of potentially faulting
69 * insns (like twenty ldd/std's with now intervening other instructions)
70 * You specify address of first in insn and 0 in fixup and in the next
71 * exception_table_entry you specify last potentially faulting insn + 1
72 * and in fixup the routine which should handle the fault.
73 * That fixup code will get
74 * (faulting_insn_address - first_insn_in_the_range_address)/4
75 * in %g2 (ie. index of the faulting instruction in the range).
78 struct exception_table_entry
80 unsigned long insn
, fixup
;
83 /* Returns 0 if exception not found and fixup otherwise. */
84 extern unsigned long search_extables_range(unsigned long addr
, unsigned long *g2
);
86 extern void __ret_efault(void);
88 /* Uh, these should become the main single-value transfer routines..
89 * They automatically use the right size if we just have the right
92 * This gets kind of ugly. We want to return _two_ values in "get_user()"
93 * and yet we don't want to do any pointers, because that is too much
94 * of a performance impact. Thus we have a few rather ugly macros here,
95 * and hide all the ugliness from the user.
97 #define put_user(x,ptr) ({ \
98 unsigned long __pu_addr = (unsigned long)(ptr); \
99 __chk_user_ptr(ptr); \
100 __put_user_check((__typeof__(*(ptr)))(x),__pu_addr,sizeof(*(ptr))); })
102 #define get_user(x,ptr) ({ \
103 unsigned long __gu_addr = (unsigned long)(ptr); \
104 __chk_user_ptr(ptr); \
105 __get_user_check((x),__gu_addr,sizeof(*(ptr)),__typeof__(*(ptr))); })
108 * The "__xxx" versions do not do address space checking, useful when
109 * doing multiple accesses to the same area (the user has to do the
110 * checks by hand with "access_ok()")
112 #define __put_user(x,ptr) __put_user_nocheck((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr)))
113 #define __get_user(x,ptr) __get_user_nocheck((x),(ptr),sizeof(*(ptr)),__typeof__(*(ptr)))
115 struct __large_struct
{ unsigned long buf
[100]; };
116 #define __m(x) ((struct __large_struct __user *)(x))
118 #define __put_user_check(x,addr,size) ({ \
119 register int __pu_ret; \
120 if (__access_ok(addr,size)) { \
122 case 1: __put_user_asm(x,b,addr,__pu_ret); break; \
123 case 2: __put_user_asm(x,h,addr,__pu_ret); break; \
124 case 4: __put_user_asm(x,,addr,__pu_ret); break; \
125 case 8: __put_user_asm(x,d,addr,__pu_ret); break; \
126 default: __pu_ret = __put_user_bad(); break; \
127 } } else { __pu_ret = -EFAULT; } __pu_ret; })
129 #define __put_user_check_ret(x,addr,size,retval) ({ \
130 register int __foo __asm__ ("l1"); \
131 if (__access_ok(addr,size)) { \
133 case 1: __put_user_asm_ret(x,b,addr,retval,__foo); break; \
134 case 2: __put_user_asm_ret(x,h,addr,retval,__foo); break; \
135 case 4: __put_user_asm_ret(x,,addr,retval,__foo); break; \
136 case 8: __put_user_asm_ret(x,d,addr,retval,__foo); break; \
137 default: if (__put_user_bad()) return retval; break; \
138 } } else return retval; })
140 #define __put_user_nocheck(x,addr,size) ({ \
141 register int __pu_ret; \
143 case 1: __put_user_asm(x,b,addr,__pu_ret); break; \
144 case 2: __put_user_asm(x,h,addr,__pu_ret); break; \
145 case 4: __put_user_asm(x,,addr,__pu_ret); break; \
146 case 8: __put_user_asm(x,d,addr,__pu_ret); break; \
147 default: __pu_ret = __put_user_bad(); break; \
150 #define __put_user_nocheck_ret(x,addr,size,retval) ({ \
151 register int __foo __asm__ ("l1"); \
153 case 1: __put_user_asm_ret(x,b,addr,retval,__foo); break; \
154 case 2: __put_user_asm_ret(x,h,addr,retval,__foo); break; \
155 case 4: __put_user_asm_ret(x,,addr,retval,__foo); break; \
156 case 8: __put_user_asm_ret(x,d,addr,retval,__foo); break; \
157 default: if (__put_user_bad()) return retval; break; \
160 #define __put_user_asm(x,size,addr,ret) \
161 __asm__ __volatile__( \
162 "/* Put user asm, inline. */\n" \
163 "1:\t" "st"#size " %1, %2\n\t" \
166 ".section .fixup,#alloc,#execinstr\n\t" \
172 ".section __ex_table,#alloc\n\t" \
176 : "=&r" (ret) : "r" (x), "m" (*__m(addr)), \
179 #define __put_user_asm_ret(x,size,addr,ret,foo) \
180 if (__builtin_constant_p(ret) && ret == -EFAULT) \
181 __asm__ __volatile__( \
182 "/* Put user asm ret, inline. */\n" \
183 "1:\t" "st"#size " %1, %2\n\n\t" \
184 ".section __ex_table,#alloc\n\t" \
186 ".word 1b, __ret_efault\n\n\t" \
188 : "=r" (foo) : "r" (x), "m" (*__m(addr))); \
190 __asm__ __volatile( \
191 "/* Put user asm ret, inline. */\n" \
192 "1:\t" "st"#size " %1, %2\n\n\t" \
193 ".section .fixup,#alloc,#execinstr\n\t" \
197 " restore %%g0, %3, %%o0\n\t" \
199 ".section __ex_table,#alloc\n\t" \
201 ".word 1b, 3b\n\n\t" \
203 : "=r" (foo) : "r" (x), "m" (*__m(addr)), "i" (ret))
205 extern int __put_user_bad(void);
207 #define __get_user_check(x,addr,size,type) ({ \
208 register int __gu_ret; \
209 register unsigned long __gu_val; \
210 if (__access_ok(addr,size)) { \
212 case 1: __get_user_asm(__gu_val,ub,addr,__gu_ret); break; \
213 case 2: __get_user_asm(__gu_val,uh,addr,__gu_ret); break; \
214 case 4: __get_user_asm(__gu_val,,addr,__gu_ret); break; \
215 case 8: __get_user_asm(__gu_val,d,addr,__gu_ret); break; \
216 default: __gu_val = 0; __gu_ret = __get_user_bad(); break; \
217 } } else { __gu_val = 0; __gu_ret = -EFAULT; } x = (type) __gu_val; __gu_ret; })
219 #define __get_user_check_ret(x,addr,size,type,retval) ({ \
220 register unsigned long __gu_val __asm__ ("l1"); \
221 if (__access_ok(addr,size)) { \
223 case 1: __get_user_asm_ret(__gu_val,ub,addr,retval); break; \
224 case 2: __get_user_asm_ret(__gu_val,uh,addr,retval); break; \
225 case 4: __get_user_asm_ret(__gu_val,,addr,retval); break; \
226 case 8: __get_user_asm_ret(__gu_val,d,addr,retval); break; \
227 default: if (__get_user_bad()) return retval; \
228 } x = (type) __gu_val; } else return retval; })
230 #define __get_user_nocheck(x,addr,size,type) ({ \
231 register int __gu_ret; \
232 register unsigned long __gu_val; \
234 case 1: __get_user_asm(__gu_val,ub,addr,__gu_ret); break; \
235 case 2: __get_user_asm(__gu_val,uh,addr,__gu_ret); break; \
236 case 4: __get_user_asm(__gu_val,,addr,__gu_ret); break; \
237 case 8: __get_user_asm(__gu_val,d,addr,__gu_ret); break; \
238 default: __gu_val = 0; __gu_ret = __get_user_bad(); break; \
239 } x = (type) __gu_val; __gu_ret; })
241 #define __get_user_nocheck_ret(x,addr,size,type,retval) ({ \
242 register unsigned long __gu_val __asm__ ("l1"); \
244 case 1: __get_user_asm_ret(__gu_val,ub,addr,retval); break; \
245 case 2: __get_user_asm_ret(__gu_val,uh,addr,retval); break; \
246 case 4: __get_user_asm_ret(__gu_val,,addr,retval); break; \
247 case 8: __get_user_asm_ret(__gu_val,d,addr,retval); break; \
248 default: if (__get_user_bad()) return retval; \
249 } x = (type) __gu_val; })
251 #define __get_user_asm(x,size,addr,ret) \
252 __asm__ __volatile__( \
253 "/* Get user asm, inline. */\n" \
254 "1:\t" "ld"#size " %2, %1\n\t" \
257 ".section .fixup,#alloc,#execinstr\n\t" \
262 " mov %3, %0\n\n\t" \
264 ".section __ex_table,#alloc\n\t" \
266 ".word 1b, 3b\n\n\t" \
268 : "=&r" (ret), "=&r" (x) : "m" (*__m(addr)), \
271 #define __get_user_asm_ret(x,size,addr,retval) \
272 if (__builtin_constant_p(retval) && retval == -EFAULT) \
273 __asm__ __volatile__( \
274 "/* Get user asm ret, inline. */\n" \
275 "1:\t" "ld"#size " %1, %0\n\n\t" \
276 ".section __ex_table,#alloc\n\t" \
278 ".word 1b,__ret_efault\n\n\t" \
280 : "=&r" (x) : "m" (*__m(addr))); \
282 __asm__ __volatile__( \
283 "/* Get user asm ret, inline. */\n" \
284 "1:\t" "ld"#size " %1, %0\n\n\t" \
285 ".section .fixup,#alloc,#execinstr\n\t" \
289 " restore %%g0, %2, %%o0\n\n\t" \
291 ".section __ex_table,#alloc\n\t" \
293 ".word 1b, 3b\n\n\t" \
295 : "=&r" (x) : "m" (*__m(addr)), "i" (retval))
297 extern int __get_user_bad(void);
299 extern unsigned long __copy_user(void __user
*to
, const void __user
*from
, unsigned long size
);
301 static inline unsigned long copy_to_user(void __user
*to
, const void *from
, unsigned long n
)
303 if (n
&& __access_ok((unsigned long) to
, n
))
304 return __copy_user(to
, (__force
void __user
*) from
, n
);
309 static inline unsigned long __copy_to_user(void __user
*to
, const void *from
, unsigned long n
)
311 return __copy_user(to
, (__force
void __user
*) from
, n
);
314 static inline unsigned long copy_from_user(void *to
, const void __user
*from
, unsigned long n
)
316 if (n
&& __access_ok((unsigned long) from
, n
))
317 return __copy_user((__force
void __user
*) to
, from
, n
);
322 static inline unsigned long __copy_from_user(void *to
, const void __user
*from
, unsigned long n
)
324 return __copy_user((__force
void __user
*) to
, from
, n
);
327 #define __copy_to_user_inatomic __copy_to_user
328 #define __copy_from_user_inatomic __copy_from_user
330 static inline unsigned long __clear_user(void __user
*addr
, unsigned long size
)
334 __asm__
__volatile__ (
335 ".section __ex_table,#alloc\n\t"
344 : "=r" (ret
) : "r" (addr
), "r" (size
) :
345 "o0", "o1", "o2", "o3", "o4", "o5", "o7",
346 "g1", "g2", "g3", "g4", "g5", "g7", "cc");
351 static inline unsigned long clear_user(void __user
*addr
, unsigned long n
)
353 if (n
&& __access_ok((unsigned long) addr
, n
))
354 return __clear_user(addr
, n
);
359 extern long __strncpy_from_user(char *dest
, const char __user
*src
, long count
);
361 static inline long strncpy_from_user(char *dest
, const char __user
*src
, long count
)
363 if (__access_ok((unsigned long) src
, count
))
364 return __strncpy_from_user(dest
, src
, count
);
369 extern long __strlen_user(const char __user
*);
370 extern long __strnlen_user(const char __user
*, long len
);
372 static inline long strlen_user(const char __user
*str
)
374 if (!access_ok(VERIFY_READ
, str
, 0))
377 return __strlen_user(str
);
380 static inline long strnlen_user(const char __user
*str
, long len
)
382 if (!access_ok(VERIFY_READ
, str
, 0))
385 return __strnlen_user(str
, len
);
388 #endif /* __ASSEMBLY__ */
390 #endif /* _ASM_UACCESS_H */