uaccess.h 9.2 KB

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  1. #ifndef __PARISC_UACCESS_H
  2. #define __PARISC_UACCESS_H
  3. /*
  4. * User space memory access functions
  5. */
  6. #include <asm/page.h>
  7. #include <asm/cache.h>
  8. #include <asm/errno.h>
  9. #include <asm-generic/uaccess-unaligned.h>
  10. #define VERIFY_READ 0
  11. #define VERIFY_WRITE 1
  12. #define KERNEL_DS ((mm_segment_t){0})
  13. #define USER_DS ((mm_segment_t){1})
  14. #define segment_eq(a,b) ((a).seg == (b).seg)
  15. #define get_ds() (KERNEL_DS)
  16. #define get_fs() (current_thread_info()->addr_limit)
  17. #define set_fs(x) (current_thread_info()->addr_limit = (x))
  18. /*
  19. * Note that since kernel addresses are in a separate address space on
  20. * parisc, we don't need to do anything for access_ok().
  21. * We just let the page fault handler do the right thing. This also means
  22. * that put_user is the same as __put_user, etc.
  23. */
  24. extern int __get_kernel_bad(void);
  25. extern int __get_user_bad(void);
  26. extern int __put_kernel_bad(void);
  27. extern int __put_user_bad(void);
  28. static inline long access_ok(int type, const void __user * addr,
  29. unsigned long size)
  30. {
  31. return 1;
  32. }
  33. #define put_user __put_user
  34. #define get_user __get_user
  35. #if !defined(CONFIG_64BIT)
  36. #define LDD_KERNEL(ptr) __get_kernel_bad();
  37. #define LDD_USER(ptr) __get_user_bad();
  38. #define STD_KERNEL(x, ptr) __put_kernel_asm64(x,ptr)
  39. #define STD_USER(x, ptr) __put_user_asm64(x,ptr)
  40. #define ASM_WORD_INSN ".word\t"
  41. #else
  42. #define LDD_KERNEL(ptr) __get_kernel_asm("ldd",ptr)
  43. #define LDD_USER(ptr) __get_user_asm("ldd",ptr)
  44. #define STD_KERNEL(x, ptr) __put_kernel_asm("std",x,ptr)
  45. #define STD_USER(x, ptr) __put_user_asm("std",x,ptr)
  46. #define ASM_WORD_INSN ".dword\t"
  47. #endif
  48. /*
  49. * The exception table contains two values: the first is an address
  50. * for an instruction that is allowed to fault, and the second is
  51. * the address to the fixup routine.
  52. */
  53. struct exception_table_entry {
  54. unsigned long insn; /* address of insn that is allowed to fault. */
  55. long fixup; /* fixup routine */
  56. };
  57. #define ASM_EXCEPTIONTABLE_ENTRY( fault_addr, except_addr )\
  58. ".section __ex_table,\"aw\"\n" \
  59. ASM_WORD_INSN #fault_addr ", " #except_addr "\n\t" \
  60. ".previous\n"
  61. /*
  62. * The page fault handler stores, in a per-cpu area, the following information
  63. * if a fixup routine is available.
  64. */
  65. struct exception_data {
  66. unsigned long fault_ip;
  67. unsigned long fault_space;
  68. unsigned long fault_addr;
  69. };
  70. #define __get_user(x,ptr) \
  71. ({ \
  72. register long __gu_err __asm__ ("r8") = 0; \
  73. register long __gu_val __asm__ ("r9") = 0; \
  74. \
  75. if (segment_eq(get_fs(),KERNEL_DS)) { \
  76. switch (sizeof(*(ptr))) { \
  77. case 1: __get_kernel_asm("ldb",ptr); break; \
  78. case 2: __get_kernel_asm("ldh",ptr); break; \
  79. case 4: __get_kernel_asm("ldw",ptr); break; \
  80. case 8: LDD_KERNEL(ptr); break; \
  81. default: __get_kernel_bad(); break; \
  82. } \
  83. } \
  84. else { \
  85. switch (sizeof(*(ptr))) { \
  86. case 1: __get_user_asm("ldb",ptr); break; \
  87. case 2: __get_user_asm("ldh",ptr); break; \
  88. case 4: __get_user_asm("ldw",ptr); break; \
  89. case 8: LDD_USER(ptr); break; \
  90. default: __get_user_bad(); break; \
  91. } \
  92. } \
  93. \
  94. (x) = (__typeof__(*(ptr))) __gu_val; \
  95. __gu_err; \
  96. })
  97. #define __get_kernel_asm(ldx,ptr) \
  98. __asm__("\n1:\t" ldx "\t0(%2),%0\n\t" \
  99. ASM_EXCEPTIONTABLE_ENTRY(1b, fixup_get_user_skip_1)\
  100. : "=r"(__gu_val), "=r"(__gu_err) \
  101. : "r"(ptr), "1"(__gu_err) \
  102. : "r1");
  103. #define __get_user_asm(ldx,ptr) \
  104. __asm__("\n1:\t" ldx "\t0(%%sr3,%2),%0\n\t" \
  105. ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_get_user_skip_1)\
  106. : "=r"(__gu_val), "=r"(__gu_err) \
  107. : "r"(ptr), "1"(__gu_err) \
  108. : "r1");
  109. #define __put_user(x,ptr) \
  110. ({ \
  111. register long __pu_err __asm__ ("r8") = 0; \
  112. __typeof__(*(ptr)) __x = (__typeof__(*(ptr)))(x); \
  113. \
  114. if (segment_eq(get_fs(),KERNEL_DS)) { \
  115. switch (sizeof(*(ptr))) { \
  116. case 1: __put_kernel_asm("stb",__x,ptr); break; \
  117. case 2: __put_kernel_asm("sth",__x,ptr); break; \
  118. case 4: __put_kernel_asm("stw",__x,ptr); break; \
  119. case 8: STD_KERNEL(__x,ptr); break; \
  120. default: __put_kernel_bad(); break; \
  121. } \
  122. } \
  123. else { \
  124. switch (sizeof(*(ptr))) { \
  125. case 1: __put_user_asm("stb",__x,ptr); break; \
  126. case 2: __put_user_asm("sth",__x,ptr); break; \
  127. case 4: __put_user_asm("stw",__x,ptr); break; \
  128. case 8: STD_USER(__x,ptr); break; \
  129. default: __put_user_bad(); break; \
  130. } \
  131. } \
  132. \
  133. __pu_err; \
  134. })
  135. /*
  136. * The "__put_user/kernel_asm()" macros tell gcc they read from memory
  137. * instead of writing. This is because they do not write to any memory
  138. * gcc knows about, so there are no aliasing issues. These macros must
  139. * also be aware that "fixup_put_user_skip_[12]" are executed in the
  140. * context of the fault, and any registers used there must be listed
  141. * as clobbers. In this case only "r1" is used by the current routines.
  142. * r8/r9 are already listed as err/val.
  143. */
  144. #define __put_kernel_asm(stx,x,ptr) \
  145. __asm__ __volatile__ ( \
  146. "\n1:\t" stx "\t%2,0(%1)\n\t" \
  147. ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_1)\
  148. : "=r"(__pu_err) \
  149. : "r"(ptr), "r"(x), "0"(__pu_err) \
  150. : "r1")
  151. #define __put_user_asm(stx,x,ptr) \
  152. __asm__ __volatile__ ( \
  153. "\n1:\t" stx "\t%2,0(%%sr3,%1)\n\t" \
  154. ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_1)\
  155. : "=r"(__pu_err) \
  156. : "r"(ptr), "r"(x), "0"(__pu_err) \
  157. : "r1")
  158. #if !defined(CONFIG_64BIT)
  159. #define __put_kernel_asm64(__val,ptr) do { \
  160. u64 __val64 = (u64)(__val); \
  161. u32 hi = (__val64) >> 32; \
  162. u32 lo = (__val64) & 0xffffffff; \
  163. __asm__ __volatile__ ( \
  164. "\n1:\tstw %2,0(%1)" \
  165. "\n2:\tstw %3,4(%1)\n\t" \
  166. ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_2)\
  167. ASM_EXCEPTIONTABLE_ENTRY(2b,fixup_put_user_skip_1)\
  168. : "=r"(__pu_err) \
  169. : "r"(ptr), "r"(hi), "r"(lo), "0"(__pu_err) \
  170. : "r1"); \
  171. } while (0)
  172. #define __put_user_asm64(__val,ptr) do { \
  173. u64 __val64 = (u64)(__val); \
  174. u32 hi = (__val64) >> 32; \
  175. u32 lo = (__val64) & 0xffffffff; \
  176. __asm__ __volatile__ ( \
  177. "\n1:\tstw %2,0(%%sr3,%1)" \
  178. "\n2:\tstw %3,4(%%sr3,%1)\n\t" \
  179. ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_2)\
  180. ASM_EXCEPTIONTABLE_ENTRY(2b,fixup_put_user_skip_1)\
  181. : "=r"(__pu_err) \
  182. : "r"(ptr), "r"(hi), "r"(lo), "0"(__pu_err) \
  183. : "r1"); \
  184. } while (0)
  185. #endif /* !defined(CONFIG_64BIT) */
  186. /*
  187. * Complex access routines -- external declarations
  188. */
  189. extern unsigned long lcopy_to_user(void __user *, const void *, unsigned long);
  190. extern unsigned long lcopy_from_user(void *, const void __user *, unsigned long);
  191. extern unsigned long lcopy_in_user(void __user *, const void __user *, unsigned long);
  192. extern long lstrncpy_from_user(char *, const char __user *, long);
  193. extern unsigned lclear_user(void __user *,unsigned long);
  194. extern long lstrnlen_user(const char __user *,long);
  195. /*
  196. * Complex access routines -- macros
  197. */
  198. #define strncpy_from_user lstrncpy_from_user
  199. #define strnlen_user lstrnlen_user
  200. #define strlen_user(str) lstrnlen_user(str, 0x7fffffffL)
  201. #define clear_user lclear_user
  202. #define __clear_user lclear_user
  203. unsigned long copy_to_user(void __user *dst, const void *src, unsigned long len);
  204. #define __copy_to_user copy_to_user
  205. unsigned long __copy_from_user(void *dst, const void __user *src, unsigned long len);
  206. unsigned long copy_in_user(void __user *dst, const void __user *src, unsigned long len);
  207. #define __copy_in_user copy_in_user
  208. #define __copy_to_user_inatomic __copy_to_user
  209. #define __copy_from_user_inatomic __copy_from_user
  210. extern void copy_from_user_overflow(void)
  211. #ifdef CONFIG_DEBUG_STRICT_USER_COPY_CHECKS
  212. __compiletime_error("copy_from_user() buffer size is not provably correct")
  213. #else
  214. __compiletime_warning("copy_from_user() buffer size is not provably correct")
  215. #endif
  216. ;
  217. static inline unsigned long __must_check copy_from_user(void *to,
  218. const void __user *from,
  219. unsigned long n)
  220. {
  221. int sz = __compiletime_object_size(to);
  222. int ret = -EFAULT;
  223. if (likely(sz == -1 || !__builtin_constant_p(n) || sz >= n))
  224. ret = __copy_from_user(to, from, n);
  225. else
  226. copy_from_user_overflow();
  227. return ret;
  228. }
  229. struct pt_regs;
  230. int fixup_exception(struct pt_regs *regs);
  231. #endif /* __PARISC_UACCESS_H */