diff options
Diffstat (limited to 'arch/blackfin')
| -rw-r--r-- | arch/blackfin/include/asm/uaccess.h | 74 |
1 files changed, 31 insertions, 43 deletions
diff --git a/arch/blackfin/include/asm/uaccess.h b/arch/blackfin/include/asm/uaccess.h index d928b809905..daf2dc8e98c 100644 --- a/arch/blackfin/include/asm/uaccess.h +++ b/arch/blackfin/include/asm/uaccess.h @@ -149,54 +149,42 @@ static inline int bad_user_access_length(void) : /* 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__, __func__); \ - _err = __get_user_bad(); \ - break; \ - } \ - } \ - _err; \ - }) +#define get_user(x, ptr) \ +({ \ + int _err = 0; \ + unsigned long _val = 0; \ + const typeof(*(ptr)) __user *_p = (ptr); \ + const size_t ptr_size = sizeof(*(_p)); \ + if (likely(access_ok(VERIFY_READ, _p, ptr_size))) { \ + BUILD_BUG_ON(ptr_size >= 8); \ + switch (ptr_size) { \ + case 1: \ + __get_user_asm(_val, _p, B,(Z)); \ + break; \ + case 2: \ + __get_user_asm(_val, _p, W,(Z)); \ + break; \ + case 4: \ + __get_user_asm(_val, _p, , ); \ + break; \ + } \ + } else \ + _err = -EFAULT; \ + x = (typeof(*(ptr)))_val; \ + _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 __get_user_asm(x, ptr, bhw, option) \ +({ \ + __asm__ __volatile__ ( \ + "%0 =" #bhw "[%1]" #option ";" \ + : "=d" (x) \ + : "a" (__ptr(ptr))); \ +}) #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) |