/* Changes made by Lineo Inc. May 2001 * * Based on: include/asm-m68knommu/uaccess.h */ #ifndef __BLACKFIN_UACCESS_H #define __BLACKFIN_UACCESS_H /* * User space memory access functions */ #include #include #include #include #ifdef CONFIG_ACCESS_CHECK # include #endif #define get_ds() (KERNEL_DS) #define get_fs() (current_thread_info()->addr_limit) static inline void set_fs(mm_segment_t fs) { current_thread_info()->addr_limit = fs; } #define segment_eq(a,b) ((a) == (b)) #define VERIFY_READ 0 #define VERIFY_WRITE 1 #define access_ok(type,addr,size) _access_ok((unsigned long)(addr),(size)) static inline int is_in_rom(unsigned long addr) { /* * What we are really trying to do is determine if addr is * in an allocated kernel memory region. If not then assume * we cannot free it or otherwise de-allocate it. Ideally * we could restrict this to really being in a ROM or flash, * but that would need to be done on a board by board basis, * not globally. */ if ((addr < _ramstart) || (addr >= _ramend)) return (1); /* Default case, not in ROM */ return (0); } /* * The fs value determines whether argument validity checking should be * performed or not. If get_fs() == USER_DS, checking is performed, with * get_fs() == KERNEL_DS, checking is bypassed. */ #ifndef CONFIG_ACCESS_CHECK static inline int _access_ok(unsigned long addr, unsigned long size) { return 1; } #else #ifdef CONFIG_ACCESS_OK_L1 extern int _access_ok(unsigned long addr, unsigned long size)__attribute__((l1_text)); #else extern int _access_ok(unsigned long addr, unsigned long size); #endif #endif /* * 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,p) \ ({ \ int _err = 0; \ typeof(*(p)) _x = (x); \ typeof(*(p)) *_p = (p); \ if (!access_ok(VERIFY_WRITE, _p, sizeof(*(_p)))) {\ _err = -EFAULT; \ } \ else { \ switch (sizeof (*(_p))) { \ case 1: \ __put_user_asm(_x, _p, B); \ break; \ case 2: \ __put_user_asm(_x, _p, W); \ break; \ case 4: \ __put_user_asm(_x, _p, ); \ break; \ case 8: { \ long _xl, _xh; \ _xl = ((long *)&_x)[0]; \ _xh = ((long *)&_x)[1]; \ __put_user_asm(_xl, ((long *)_p)+0, ); \ __put_user_asm(_xh, ((long *)_p)+1, ); \ } break; \ default: \ _err = __put_user_bad(); \ break; \ } \ } \ _err; \ }) #define __put_user(x,p) put_user(x,p) static inline int bad_user_access_length(void) { panic("bad_user_access_length"); return -1; } #define __put_user_bad() (printk(KERN_INFO "put_user_bad %s:%d %s\n",\ __FILE__, __LINE__, __FUNCTION__),\ bad_user_access_length(), (-EFAULT)) /* * 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(x,p,bhw) \ __asm__ (#bhw"[%1] = %0;\n\t" \ : /* no outputs */ \ :"d" (x),"a" (__ptr(p)) : "memory") #define get_user(x,p) \ ({ \ int _err = 0; \ typeof(*(p)) *_p = (p); \ if (!access_ok(VERIFY_READ, _p, sizeof(*(_p)))) { \ _err = -EFAULT; \ } \ else { \ switch (sizeof(*(_p))) { \ case 1: \ __get_user_asm(x, _p, B,(Z)); \ break; \ case 2: \ __get_user_asm(x, _p, W,(Z)); \ break; \ case 4: \ __get_user_asm(x, _p, , ); \ break; \ case 8: { \ unsigned long _xl, _xh; \ __get_user_asm(_xl, ((unsigned long *)_p)+0, , ); \ __get_user_asm(_xh, ((unsigned long *)_p)+1, , ); \ ((unsigned long *)&x)[0] = _xl; \ ((unsigned long *)&x)[1] = _xh; \ } break; \ default: \ x = 0; \ printk(KERN_INFO "get_user_bad: %s:%d %s\n", \ __FILE__, __LINE__, __FUNCTION__); \ _err = __get_user_bad(); \ break; \ } \ } \ _err; \ }) #define __get_user(x,p) get_user(x,p) #define __get_user_bad() (bad_user_access_length(), (-EFAULT)) #define __get_user_asm(x,p,bhw,option) \ { \ unsigned long _tmp; \ __asm__ ("%0 =" #bhw "[%1]"#option";\n\t" \ : "=d" (_tmp) \ : "a" (__ptr(p))); \ (x) = (__typeof__(*(p))) _tmp; \ } #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; }) static inline long copy_from_user(void *to, const void __user * from, unsigned long n) { if (access_ok(VERIFY_READ, from, n)) memcpy(to, from, n); else return n; return 0; } static inline long copy_to_user(void *to, const void __user * from, unsigned long n) { if (access_ok(VERIFY_WRITE, to, n)) memcpy(to, from, n); else return n; return 0; } /* * Copy a null terminated string from userspace. */ static inline long strncpy_from_user(char *dst, const char *src, long count) { char *tmp; if (!access_ok(VERIFY_READ, src, 1)) return -EFAULT; strncpy(dst, src, count); for (tmp = dst; *tmp && count > 0; tmp++, count--) ; return (tmp - dst); } /* * 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); } #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; } #define clear_user(to, n) __clear_user(to, n) #endif /* _BLACKFIN_UACCESS_H */