#ifndef __M68KNOMMU_UACCESS_H #define __M68KNOMMU_UACCESS_H /* * User space memory access functions */ #include <linux/sched.h> #include <linux/mm.h> #include <linux/string.h> #include <asm/segment.h> #define VERIFY_READ 0 #define VERIFY_WRITE 1 #define access_ok(type,addr,size) _access_ok((unsigned long)(addr),(size)) static inline int _access_ok(unsigned long addr, unsigned long size) { extern unsigned long memory_start, memory_end; return (((addr >= memory_start) && (addr+size < memory_end)) || (is_in_rom(addr) && is_in_rom(addr+size))); } /* * The exception table consists of pairs of addresses: the first is the * address of an instruction that is allowed to fault, and the second is * the address at which the program should continue. No registers are * modified, so it is entirely up to the continuation code to figure out * what to do. * * All the routines below use bits of fixup code that are out of line * with the main instruction path. This means when everything is well, * we don't even have to jump over them. Further, they do not intrude * on our cache or tlb entries. */ struct exception_table_entry { unsigned long insn, fixup; }; /* Returns 0 if exception not found and fixup otherwise. */ extern unsigned long search_exception_table(unsigned long); /* * These are the main single-value transfer routines. They automatically * use the right size if we just have the right pointer type. */ #define put_user(x, ptr) \ ({ \ int __pu_err = 0; \ typeof(*(ptr)) __pu_val = (x); \ switch (sizeof (*(ptr))) { \ case 1: \ __put_user_asm(__pu_err, __pu_val, ptr, b); \ break; \ case 2: \ __put_user_asm(__pu_err, __pu_val, ptr, w); \ break; \ case 4: \ __put_user_asm(__pu_err, __pu_val, ptr, l); \ break; \ case 8: \ memcpy(ptr, &__pu_val, sizeof (*(ptr))); \ break; \ default: \ __pu_err = __put_user_bad(); \ break; \ } \ __pu_err; \ }) #define __put_user(x, ptr) put_user(x, ptr) extern int __put_user_bad(void); /* * Tell gcc we read from memory instead of writing: this is because * we do not write to any memory gcc knows about, so there are no * aliasing issues. */ #define __ptr(x) ((unsigned long *)(x)) #define __put_user_asm(err,x,ptr,bwl) \ __asm__ ("move" #bwl " %0,%1" \ : /* no outputs */ \ :"d" (x),"m" (*__ptr(ptr)) : "memory") #define get_user(x, ptr) \ ({ \ int __gu_err = 0; \ typeof(x) __gu_val = 0; \ switch (sizeof(*(ptr))) { \ case 1: \ __get_user_asm(__gu_err, __gu_val, ptr, b, "=d"); \ break; \ case 2: \ __get_user_asm(__gu_err, __gu_val, ptr, w, "=r"); \ break; \ case 4: \ __get_user_asm(__gu_err, __gu_val, ptr, l, "=r"); \ break; \ case 8: \ memcpy((void *) &__gu_val, ptr, sizeof (*(ptr))); \ break; \ default: \ __gu_val = 0; \ __gu_err = __get_user_bad(); \ break; \ } \ (x) = (typeof(*(ptr))) __gu_val; \ __gu_err; \ }) #define __get_user(x, ptr) get_user(x, ptr) extern int __get_user_bad(void); #define __get_user_asm(err,x,ptr,bwl,reg) \ __asm__ ("move" #bwl " %1,%0" \ : "=d" (x) \ : "m" (*__ptr(ptr))) #define copy_from_user(to, from, n) (memcpy(to, from, n), 0) #define copy_to_user(to, from, n) (memcpy(to, from, n), 0) #define __copy_from_user(to, from, n) copy_from_user(to, from, n) #define __copy_to_user(to, from, n) copy_to_user(to, from, n) #define __copy_to_user_inatomic __copy_to_user #define __copy_from_user_inatomic __copy_from_user #define copy_to_user_ret(to,from,n,retval) ({ if (copy_to_user(to,from,n)) return retval; }) #define copy_from_user_ret(to,from,n,retval) ({ if (copy_from_user(to,from,n)) return retval; }) /* * Copy a null terminated string from userspace. */ static inline long strncpy_from_user(char *dst, const char *src, long count) { char *tmp; strncpy(dst, src, count); for (tmp = dst; *tmp && count > 0; tmp++, count--) ; return(tmp - dst); /* DAVIDM should we count a NUL ? check getname */ } /* * Return the size of a string (including the ending 0) * * Return 0 on exception, a value greater than N if too long */ static inline long strnlen_user(const char *src, long n) { return(strlen(src) + 1); /* DAVIDM make safer */ } #define strlen_user(str) strnlen_user(str, 32767) /* * Zero Userspace */ static inline unsigned long clear_user(void *to, unsigned long n) { memset(to, 0, n); return 0; } #endif /* _M68KNOMMU_UACCESS_H */