1#ifndef __H8300_UACCESS_H 2#define __H8300_UACCESS_H 3 4/* 5 * User space memory access functions 6 */ 7#include <linux/sched.h> 8#include <linux/mm.h> 9#include <linux/string.h> 10 11#include <asm/segment.h> 12 13#define VERIFY_READ 0 14#define VERIFY_WRITE 1 15 16/* We let the MMU do all checking */ 17#define access_ok(type, addr, size) __access_ok((unsigned long)addr,size) 18static inline int __access_ok(unsigned long addr, unsigned long size) 19{ 20#define RANGE_CHECK_OK(addr, size, lower, upper) \ 21 (((addr) >= (lower)) && (((addr) + (size)) < (upper))) 22 23 extern unsigned long _ramend; 24 return(RANGE_CHECK_OK(addr, size, 0L, (unsigned long)&_ramend)); 25} 26 27/* 28 * The exception table consists of pairs of addresses: the first is the 29 * address of an instruction that is allowed to fault, and the second is 30 * the address at which the program should continue. No registers are 31 * modified, so it is entirely up to the continuation code to figure out 32 * what to do. 33 * 34 * All the routines below use bits of fixup code that are out of line 35 * with the main instruction path. This means when everything is well, 36 * we don't even have to jump over them. Further, they do not intrude 37 * on our cache or tlb entries. 38 */ 39 40struct exception_table_entry 41{ 42 unsigned long insn, fixup; 43}; 44 45/* Returns 0 if exception not found and fixup otherwise. */ 46extern unsigned long search_exception_table(unsigned long); 47 48 49/* 50 * These are the main single-value transfer routines. They automatically 51 * use the right size if we just have the right pointer type. 52 */ 53 54#define put_user(x, ptr) \ 55({ \ 56 int __pu_err = 0; \ 57 typeof(*(ptr)) __pu_val = (x); \ 58 switch (sizeof (*(ptr))) { \ 59 case 1: \ 60 case 2: \ 61 case 4: \ 62 *(ptr) = (__pu_val); \ 63 break; \ 64 case 8: \ 65 memcpy(ptr, &__pu_val, sizeof (*(ptr))); \ 66 break; \ 67 default: \ 68 __pu_err = __put_user_bad(); \ 69 break; \ 70 } \ 71 __pu_err; \ 72}) 73#define __put_user(x, ptr) put_user(x, ptr) 74 75extern int __put_user_bad(void); 76 77/* 78 * Tell gcc we read from memory instead of writing: this is because 79 * we do not write to any memory gcc knows about, so there are no 80 * aliasing issues. 81 */ 82 83#define __ptr(x) ((unsigned long *)(x)) 84 85/* 86 * Tell gcc we read from memory instead of writing: this is because 87 * we do not write to any memory gcc knows about, so there are no 88 * aliasing issues. 89 */ 90 91#define get_user(x, ptr) \ 92({ \ 93 int __gu_err = 0; \ 94 typeof(*(ptr)) __gu_val = *ptr; \ 95 switch (sizeof(*(ptr))) { \ 96 case 1: \ 97 case 2: \ 98 case 4: \ 99 case 8: \ 100 break; \ 101 default: \ 102 __gu_err = __get_user_bad(); \ 103 __gu_val = 0; \ 104 break; \ 105 } \ 106 (x) = __gu_val; \ 107 __gu_err; \ 108}) 109#define __get_user(x, ptr) get_user(x, ptr) 110 111extern int __get_user_bad(void); 112 113#define copy_from_user(to, from, n) (memcpy(to, from, n), 0) 114#define copy_to_user(to, from, n) (memcpy(to, from, n), 0) 115 116#define __copy_from_user(to, from, n) copy_from_user(to, from, n) 117#define __copy_to_user(to, from, n) copy_to_user(to, from, n) 118#define __copy_to_user_inatomic __copy_to_user 119#define __copy_from_user_inatomic __copy_from_user 120 121#define copy_to_user_ret(to,from,n,retval) ({ if (copy_to_user(to,from,n)) return retval; }) 122 123#define copy_from_user_ret(to,from,n,retval) ({ if (copy_from_user(to,from,n)) return retval; }) 124 125/* 126 * Copy a null terminated string from userspace. 127 */ 128 129static inline long 130strncpy_from_user(char *dst, const char *src, long count) 131{ 132 char *tmp; 133 strncpy(dst, src, count); 134 for (tmp = dst; *tmp && count > 0; tmp++, count--) 135 ; 136 return(tmp - dst); /* DAVIDM should we count a NUL ? check getname */ 137} 138 139/* 140 * Return the size of a string (including the ending 0) 141 * 142 * Return 0 on exception, a value greater than N if too long 143 */ 144static inline long strnlen_user(const char *src, long n) 145{ 146 return(strlen(src) + 1); /* DAVIDM make safer */ 147} 148 149#define strlen_user(str) strnlen_user(str, 32767) 150 151/* 152 * Zero Userspace 153 */ 154 155static inline unsigned long 156clear_user(void *to, unsigned long n) 157{ 158 memset(to, 0, n); 159 return 0; 160} 161 162#endif /* _H8300_UACCESS_H */ 163