LXR linux/arch/sh/include/asm/uaccess.h

   1#ifndef __ASM_SH_UACCESS_H
   2#define __ASM_SH_UACCESS_H
   3
   4#include <asm/segment.h>
   5#include <asm/extable.h>
   6
   7#define __addr_ok(addr) \
   8        ((unsigned long __force)(addr) < current_thread_info()->addr_limit.seg)
   9
  10/*
  11 * __access_ok: Check if address with size is OK or not.
  12 *
  13 * Uhhuh, this needs 33-bit arithmetic. We have a carry..
  14 *
  15 * sum := addr + size;  carry? --> flag = true;
  16 * if (sum >= addr_limit) flag = true;
  17 */
  18#define __access_ok(addr, size)         \
  19        (__addr_ok((addr) + (size)))
  20#define access_ok(type, addr, size)     \
  21        (__chk_user_ptr(addr),          \
  22         __access_ok((unsigned long __force)(addr), (size)))
  23
  24#define user_addr_max() (current_thread_info()->addr_limit.seg)
  25
  26/*
  27 * Uh, these should become the main single-value transfer routines ...
  28 * They automatically use the right size if we just have the right
  29 * pointer type ...
  30 *
  31 * As SuperH uses the same address space for kernel and user data, we
  32 * can just do these as direct assignments.
  33 *
  34 * Careful to not
  35 * (a) re-use the arguments for side effects (sizeof is ok)
  36 * (b) require any knowledge of processes at this stage
  37 */
  38#define put_user(x,ptr)         __put_user_check((x), (ptr), sizeof(*(ptr)))
  39#define get_user(x,ptr)         __get_user_check((x), (ptr), sizeof(*(ptr)))
  40
  41/*
  42 * The "__xxx" versions do not do address space checking, useful when
  43 * doing multiple accesses to the same area (the user has to do the
  44 * checks by hand with "access_ok()")
  45 */
  46#define __put_user(x,ptr)       __put_user_nocheck((x), (ptr), sizeof(*(ptr)))
  47#define __get_user(x,ptr)       __get_user_nocheck((x), (ptr), sizeof(*(ptr)))
  48
  49struct __large_struct { unsigned long buf[100]; };
  50#define __m(x) (*(struct __large_struct __user *)(x))
  51
  52#define __get_user_nocheck(x,ptr,size)                          \
  53({                                                              \
  54        long __gu_err;                                          \
  55        unsigned long __gu_val;                                 \
  56        const __typeof__(*(ptr)) __user *__gu_addr = (ptr);     \
  57        __chk_user_ptr(ptr);                                    \
  58        __get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
  59        (x) = (__force __typeof__(*(ptr)))__gu_val;             \
  60        __gu_err;                                               \
  61})
  62
  63#define __get_user_check(x,ptr,size)                                    \
  64({                                                                      \
  65        long __gu_err = -EFAULT;                                        \
  66        unsigned long __gu_val = 0;                                     \
  67        const __typeof__(*(ptr)) *__gu_addr = (ptr);                    \
  68        if (likely(access_ok(VERIFY_READ, __gu_addr, (size))))          \
  69                __get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
  70        (x) = (__force __typeof__(*(ptr)))__gu_val;                     \
  71        __gu_err;                                                       \
  72})
  73
  74#define __put_user_nocheck(x,ptr,size)                          \
  75({                                                              \
  76        long __pu_err;                                          \
  77        __typeof__(*(ptr)) __user *__pu_addr = (ptr);           \
  78        __typeof__(*(ptr)) __pu_val = x;                        \
  79        __chk_user_ptr(ptr);                                    \
  80        __put_user_size(__pu_val, __pu_addr, (size), __pu_err); \
  81        __pu_err;                                               \
  82})
  83
  84#define __put_user_check(x,ptr,size)                            \
  85({                                                              \
  86        long __pu_err = -EFAULT;                                \
  87        __typeof__(*(ptr)) __user *__pu_addr = (ptr);           \
  88        __typeof__(*(ptr)) __pu_val = x;                        \
  89        if (likely(access_ok(VERIFY_WRITE, __pu_addr, size)))   \
  90                __put_user_size(__pu_val, __pu_addr, (size),    \
  91                                __pu_err);                      \
  92        __pu_err;                                               \
  93})
  94
  95#ifdef CONFIG_SUPERH32
  96# include <asm/uaccess_32.h>
  97#else
  98# include <asm/uaccess_64.h>
  99#endif
 100
 101extern long strncpy_from_user(char *dest, const char __user *src, long count);
 102
 103extern __must_check long strnlen_user(const char __user *str, long n);
 104
 105/* Generic arbitrary sized copy.  */
 106/* Return the number of bytes NOT copied */
 107__kernel_size_t __copy_user(void *to, const void *from, __kernel_size_t n);
 108
 109static __always_inline unsigned long
 110raw_copy_from_user(void *to, const void __user *from, unsigned long n)
 111{
 112        return __copy_user(to, (__force void *)from, n);
 113}
 114
 115static __always_inline unsigned long __must_check
 116raw_copy_to_user(void __user *to, const void *from, unsigned long n)
 117{
 118        return __copy_user((__force void *)to, from, n);
 119}
 120#define INLINE_COPY_FROM_USER
 121#define INLINE_COPY_TO_USER
 122
 123/*
 124 * Clear the area and return remaining number of bytes
 125 * (on failure.  Usually it's 0.)
 126 */
 127__kernel_size_t __clear_user(void *addr, __kernel_size_t size);
 128
 129#define clear_user(addr,n)                                              \
 130({                                                                      \
 131        void __user * __cl_addr = (addr);                               \
 132        unsigned long __cl_size = (n);                                  \
 133                                                                        \
 134        if (__cl_size && access_ok(VERIFY_WRITE,                        \
 135                ((unsigned long)(__cl_addr)), __cl_size))               \
 136                __cl_size = __clear_user(__cl_addr, __cl_size);         \
 137                                                                        \
 138        __cl_size;                                                      \
 139})
 140
 141extern void *set_exception_table_vec(unsigned int vec, void *handler);
 142
 143static inline void *set_exception_table_evt(unsigned int evt, void *handler)
 144{
 145        return set_exception_table_vec(evt >> 5, handler);
 146}
 147
 148struct mem_access {
 149        unsigned long (*from)(void *dst, const void __user *src, unsigned long cnt);
 150        unsigned long (*to)(void __user *dst, const void *src, unsigned long cnt);
 151};
 152
 153int handle_unaligned_access(insn_size_t instruction, struct pt_regs *regs,
 154                            struct mem_access *ma, int, unsigned long address);
 155
 156#endif /* __ASM_SH_UACCESS_H */
 157