include/asm-sparc64/uaccess.h

   1 /* $Id: uaccess.h,v 1.30 1999/05/25 16:53:32 jj Exp $ */
   2 #ifndef _ASM_UACCESS_H
   3 #define _ASM_UACCESS_H
   4
   5 /*
   6  * User space memory access functions
   7  */
   8
   9 #ifdef __KERNEL__
  10 #include <linux/sched.h>
  11 #include <linux/string.h>
  12 #include <asm/a.out.h>
  13 #include <asm/asi.h>
  14 #include <asm/system.h>
  15 #include <asm/spitfire.h>
  16 #endif
  17
  18 #ifndef __ASSEMBLY__
  19
  20 /*
  21  * Sparc64 is segmented, though more like the M68K than the I386.
  22  * We use the secondary ASI to address user memory, which references a
  23  * completely different VM map, thus there is zero chance of the user
  24  * doing something queer and tricking us into poking kernel memory.
  25  *
  26  * What is left here is basically what is needed for the other parts of
  27  * the kernel that expect to be able to manipulate, erum, "segments".
  28  * Or perhaps more properly, permissions.
  29  *
  30  * "For historical reasons, these macros are grossly misnamed." -Linus
  31  */
  32
  33 #define KERNEL_DS   ((mm_segment_t) { ASI_P })
  34 #define USER_DS     ((mm_segment_t) { ASI_AIUS })       /* har har har */
  35
  36 #define VERIFY_READ     0
  37 #define VERIFY_WRITE    1
  38
  39 #define get_fs() (current->tss.current_ds)
  40 #define get_ds() (KERNEL_DS)
  41
  42 #define segment_eq(a,b)  ((a).seg == (b).seg)
  43
  44 #define set_fs(val)                                                             \
  45 do {                                                                            \
  46         current->tss.current_ds = (val);                                        \
  47         __asm__ __volatile__ ("wr %%g0, %0, %%asi" : : "r" ((val).seg));        \
  48 } while(0)
  49
  50 #define __user_ok(addr,size) 1
  51 #define __kernel_ok (segment_eq(get_fs(), KERNEL_DS))
  52 #define __access_ok(addr,size) 1
  53 #define access_ok(type,addr,size) 1
  54
  55 extern inline int verify_area(int type, const void * addr, unsigned long size)
  56 {
  57         return 0;
  58 }
  59
  60 /*
  61  * The exception table consists of pairs of addresses: the first is the
  62  * address of an instruction that is allowed to fault, and the second is
  63  * the address at which the program should continue.  No registers are
  64  * modified, so it is entirely up to the continuation code to figure out
  65  * what to do.
  66  *
  67  * All the routines below use bits of fixup code that are out of line
  68  * with the main instruction path.  This means when everything is well,
  69  * we don't even have to jump over them.  Further, they do not intrude
  70  * on our cache or tlb entries.
  71  *
  72  * There is a special way how to put a range of potentially faulting
  73  * insns (like twenty ldd/std's with now intervening other instructions)
  74  * You specify address of first in insn and 0 in fixup and in the next
  75  * exception_table_entry you specify last potentially faulting insn + 1
  76  * and in fixup the routine which should handle the fault.
  77  * That fixup code will get
  78  * (faulting_insn_address - first_insn_in_the_range_address)/4
  79  * in %g2 (ie. index of the faulting instruction in the range).
  80  */
  81
  82 struct exception_table_entry
  83 {
  84         unsigned insn, fixup;
  85 };
  86
  87 /* Returns 0 if exception not found and fixup otherwise.  */
  88 extern unsigned long search_exception_table(unsigned long, unsigned long *);
  89
  90 extern void __ret_efault(void);
  91
  92 /* Uh, these should become the main single-value transfer routines..
  93  * They automatically use the right size if we just have the right
  94  * pointer type..
  95  *
  96  * This gets kind of ugly. We want to return _two_ values in "get_user()"
  97  * and yet we don't want to do any pointers, because that is too much
  98  * of a performance impact. Thus we have a few rather ugly macros here,
  99  * and hide all the uglyness from the user.
 100  */
 101 #define put_user(x,ptr) ({ \
 102 unsigned long __pu_addr = (unsigned long)(ptr); \
 103 __put_user_nocheck((__typeof__(*(ptr)))(x),__pu_addr,sizeof(*(ptr))); })
 104
 105 #define put_user_ret(x,ptr,retval) ({ \
 106 unsigned long __pu_addr = (unsigned long)(ptr); \
 107 __put_user_nocheck_ret((__typeof__(*(ptr)))(x),__pu_addr,sizeof(*(ptr)),retval); })
 108
 109 #define get_user(x,ptr) ({ \
 110 unsigned long __gu_addr = (unsigned long)(ptr); \
 111 __get_user_nocheck((x),__gu_addr,sizeof(*(ptr)),__typeof__(*(ptr))); })
 112
 113 #define get_user_ret(x,ptr,retval) ({ \
 114 unsigned long __gu_addr = (unsigned long)(ptr); \
 115 __get_user_nocheck_ret((x),__gu_addr,sizeof(*(ptr)),__typeof__(*(ptr)),retval); })
 116
 117 #define __put_user(x,ptr) put_user(x,ptr)
 118 #define __put_user_ret(x,ptr,retval) put_user_ret(x,ptr,retval)
 119 #define __get_user(x,ptr) get_user(x,ptr)
 120 #define __get_user_ret(x,ptr,retval) get_user_ret(x,ptr,retval)
 121
 122 struct __large_struct { unsigned long buf[100]; };
 123 #define __m(x) ((struct __large_struct *)(x))
 124
 125 #define __put_user_nocheck(data,addr,size) ({ \
 126 register int __pu_ret; \
 127 switch (size) { \
 128 case 1: __put_user_asm(data,b,addr,__pu_ret); break; \
 129 case 2: __put_user_asm(data,h,addr,__pu_ret); break; \
 130 case 4: __put_user_asm(data,w,addr,__pu_ret); break; \
 131 case 8: __put_user_asm(data,x,addr,__pu_ret); break; \
 132 default: __pu_ret = __put_user_bad(); break; \
 133 } __pu_ret; })
 134
 135 #define __put_user_nocheck_ret(data,addr,size,retval) ({ \
 136 register int __foo __asm__ ("l1"); \
 137 switch (size) { \
 138 case 1: __put_user_asm_ret(data,b,addr,retval,__foo); break; \
 139 case 2: __put_user_asm_ret(data,h,addr,retval,__foo); break; \
 140 case 4: __put_user_asm_ret(data,w,addr,retval,__foo); break; \
 141 case 8: __put_user_asm_ret(data,x,addr,retval,__foo); break; \
 142 default: if (__put_user_bad()) return retval; break; \
 143 } })
 144
 145 #define __put_user_asm(x,size,addr,ret)                                 \
 146 __asm__ __volatile__(                                                   \
 147         "/* Put user asm, inline. */\n"                                 \
 148 "1:\t"  "st"#size "a %1, [%2] %%asi\n\t"                                \
 149         "clr    %0\n"                                                   \
 150 "2:\n\n\t"                                                              \
 151         ".section .fixup,#alloc,#execinstr\n\t"                         \
 152         ".align 4\n"                                                    \
 153 "3:\n\t"                                                                \
 154         "b      2b\n\t"                                                 \
 155         " mov   %3, %0\n\n\t"                                           \
 156         ".previous\n\t"                                                 \
 157         ".section __ex_table,#alloc\n\t"                                \
 158         ".align 4\n\t"                                                  \
 159         ".word  1b, 3b\n\t"                                             \
 160         ".previous\n\n\t"                                               \
 161        : "=r" (ret) : "r" (x), "r" (__m(addr)),                         \
 162          "i" (-EFAULT))
 163
 164 #define __put_user_asm_ret(x,size,addr,ret,foo)                         \
 165 if (__builtin_constant_p(ret) && ret == -EFAULT)                        \
 166 __asm__ __volatile__(                                                   \
 167         "/* Put user asm ret, inline. */\n"                             \
 168 "1:\t"  "st"#size "a %1, [%2] %%asi\n\n\t"                              \
 169         ".section __ex_table,#alloc\n\t"                                \
 170         ".align 4\n\t"                                                  \
 171         ".word  1b, __ret_efault\n\n\t"                                 \
 172         ".previous\n\n\t"                                               \
 173        : "=r" (foo) : "r" (x), "r" (__m(addr)));                        \
 174 else                                                                    \
 175 __asm__ __volatile(                                                     \
 176         "/* Put user asm ret, inline. */\n"                             \
 177 "1:\t"  "st"#size "a %1, [%2] %%asi\n\n\t"                              \
 178         ".section .fixup,#alloc,#execinstr\n\t"                         \
 179         ".align 4\n"                                                    \
 180 "3:\n\t"                                                                \
 181         "ret\n\t"                                                       \
 182         " restore %%g0, %3, %%o0\n\n\t"                                 \
 183         ".previous\n\t"                                                 \
 184         ".section __ex_table,#alloc\n\t"                                \
 185         ".align 4\n\t"                                                  \
 186         ".word  1b, 3b\n\n\t"                                           \
 187         ".previous\n\n\t"                                               \
 188        : "=r" (foo) : "r" (x), "r" (__m(addr)),                         \
 189          "i" (ret))
 190
 191 extern int __put_user_bad(void);
 192
 193 #define __get_user_nocheck(data,addr,size,type) ({ \
 194 register int __gu_ret; \
 195 register unsigned long __gu_val; \
 196 switch (size) { \
 197 case 1: __get_user_asm(__gu_val,ub,addr,__gu_ret); break; \
 198 case 2: __get_user_asm(__gu_val,uh,addr,__gu_ret); break; \
 199 case 4: __get_user_asm(__gu_val,uw,addr,__gu_ret); break; \
 200 case 8: __get_user_asm(__gu_val,x,addr,__gu_ret); break; \
 201 default: __gu_val = 0; __gu_ret = __get_user_bad(); break; \
 202 } data = (type) __gu_val; __gu_ret; })
 203
 204 #define __get_user_nocheck_ret(data,addr,size,type,retval) ({ \
 205 register unsigned long __gu_val __asm__ ("l1"); \
 206 switch (size) { \
 207 case 1: __get_user_asm_ret(__gu_val,ub,addr,retval); break; \
 208 case 2: __get_user_asm_ret(__gu_val,uh,addr,retval); break; \
 209 case 4: __get_user_asm_ret(__gu_val,uw,addr,retval); break; \
 210 case 8: __get_user_asm_ret(__gu_val,x,addr,retval); break; \
 211 default: if (__get_user_bad()) return retval; \
 212 } data = (type) __gu_val; })
 213
 214 #define __get_user_asm(x,size,addr,ret)                                 \
 215 __asm__ __volatile__(                                                   \
 216         "/* Get user asm, inline. */\n"                                 \
 217 "1:\t"  "ld"#size "a [%2] %%asi, %1\n\t"                                \
 218         "clr    %0\n"                                                   \
 219 "2:\n\n\t"                                                              \
 220         ".section .fixup,#alloc,#execinstr\n\t"                         \
 221         ".align 4\n"                                                    \
 222 "3:\n\t"                                                                \
 223         "clr    %1\n\t"                                                 \
 224         "b      2b\n\t"                                                 \
 225         " mov   %3, %0\n\n\t"                                           \
 226         ".previous\n\t"                                                 \
 227         ".section __ex_table,#alloc\n\t"                                \
 228         ".align 4\n\t"                                                  \
 229         ".word  1b, 3b\n\n\t"                                           \
 230         ".previous\n\t"                                                 \
 231        : "=r" (ret), "=r" (x) : "r" (__m(addr)),                        \
 232          "i" (-EFAULT))
 233
 234 #define __get_user_asm_ret(x,size,addr,retval)                          \
 235 if (__builtin_constant_p(retval) && retval == -EFAULT)                  \
 236 __asm__ __volatile__(                                                   \
 237         "/* Get user asm ret, inline. */\n"                             \
 238 "1:\t"  "ld"#size "a [%1] %%asi, %0\n\n\t"                              \
 239         ".section __ex_table,#alloc\n\t"                                \
 240         ".align 4\n\t"                                                  \
 241         ".word  1b,__ret_efault\n\n\t"                                  \
 242         ".previous\n\t"                                                 \
 243        : "=r" (x) : "r" (__m(addr)));                                   \
 244 else                                                                    \
 245 __asm__ __volatile__(                                                   \
 246         "/* Get user asm ret, inline. */\n"                             \
 247 "1:\t"  "ld"#size "a [%1] %%asi, %0\n\n\t"                              \
 248         ".section .fixup,#alloc,#execinstr\n\t"                         \
 249         ".align 4\n"                                                    \
 250 "3:\n\t"                                                                \
 251         "ret\n\t"                                                       \
 252         " restore %%g0, %2, %%o0\n\n\t"                                 \
 253         ".previous\n\t"                                                 \
 254         ".section __ex_table,#alloc\n\t"                                \
 255         ".align 4\n\t"                                                  \
 256         ".word  1b, 3b\n\n\t"                                           \
 257         ".previous\n\t"                                                 \
 258        : "=r" (x) : "r" (__m(addr)), "i" (retval))
 259
 260 extern int __get_user_bad(void);
 261
 262 extern __kernel_size_t __memcpy_short(void *to, const void *from,
 263                                       __kernel_size_t size,
 264                                       long asi_src, long asi_dst);
 265
 266 extern __kernel_size_t __memcpy_entry(void *to, const void *from,
 267                                       __kernel_size_t size,
 268                                       long asi_src, long asi_dst);
 269
 270 extern __kernel_size_t __memcpy_16plus(void *to, const void *from,
 271                                        __kernel_size_t size,
 272                                        long asi_src, long asi_dst);
 273
 274 extern __kernel_size_t __memcpy_386plus(void *to, const void *from,
 275                                         __kernel_size_t size,
 276                                         long asi_src, long asi_dst);
 277
 278 extern __kernel_size_t __copy_from_user(void *to, const void *from,
 279                                         __kernel_size_t size);
 280
 281 extern __kernel_size_t __copy_to_user(void *to, const void *from,
 282                                       __kernel_size_t size);
 283
 284 extern __kernel_size_t __copy_in_user(void *to, const void *from,
 285                                       __kernel_size_t size);
 286
 287 #define copy_from_user(to,from,n)               \
 288         __copy_from_user((void *)(to),  \
 289                     (void *)(from), (__kernel_size_t)(n))
 290
 291 #define copy_from_user_ret(to,from,n,retval) ({ \
 292 if (copy_from_user(to,from,n)) \
 293         return retval; \
 294 })
 295
 296 #define __copy_from_user_ret(to,from,n,retval) ({ \
 297 if (__copy_from_user(to,from,n)) \
 298         return retval; \
 299 })
 300
 301 #define copy_to_user(to,from,n) \
 302         __copy_to_user((void *)(to), \
 303         (void *) (from), (__kernel_size_t)(n))
 304
 305 #define copy_to_user_ret(to,from,n,retval) ({ \
 306 if (copy_to_user(to,from,n)) \
 307         return retval; \
 308 })
 309
 310 #define __copy_to_user_ret(to,from,n,retval) ({ \
 311 if (__copy_to_user(to,from,n)) \
 312         return retval; \
 313 })
 314
 315 #define copy_in_user(to,from,n) \
 316         __copy_in_user((void *)(to), \
 317         (void *) (from), (__kernel_size_t)(n))
 318
 319 #define copy_in_user_ret(to,from,n,retval) ({ \
 320 if (copy_in_user(to,from,n)) \
 321         return retval; \
 322 })
 323
 324 #define __copy_in_user_ret(to,from,n,retval) ({ \
 325 if (__copy_in_user(to,from,n)) \
 326         return retval; \
 327 })
 328
 329 extern __inline__ __kernel_size_t __clear_user(void *addr, __kernel_size_t size)
 330 {
 331         extern __kernel_size_t __bzero_noasi(void *addr, __kernel_size_t size);
 332
 333         return __bzero_noasi(addr, size);
 334 }
 335
 336 #define clear_user(addr,n) \
 337         __clear_user((void *)(addr), (__kernel_size_t)(n))
 338
 339 #define clear_user_ret(addr,size,retval) ({ \
 340 if (clear_user(addr,size)) \
 341         return retval; \
 342 })
 343
 344 extern int __strncpy_from_user(unsigned long dest, unsigned long src, int count);
 345
 346 #define strncpy_from_user(dest,src,count) \
 347         __strncpy_from_user((unsigned long)(dest), (unsigned long)(src), (int)(count))
 348
 349 extern int __strlen_user(const char *);
 350
 351 #define strlen_user __strlen_user
 352
 353 #endif  /* __ASSEMBLY__ */
 354
 355 #endif /* _ASM_UACCESS_H */