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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [include/] [asm-x86_64/] [uaccess.h] - Blame information for rev 1774

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#ifndef __X86_64_UACCESS_H
#define __X86_64_UACCESS_H
 
/*
 * User space memory access functions
 */
#include <linux/config.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/prefetch.h>
#include <asm/page.h>
 
#define VERIFY_READ 0
#define VERIFY_WRITE 1
 
/*
 * 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.
 *
 * For historical reasons, these macros are grossly misnamed.
 */
 
#define MAKE_MM_SEG(s)  ((mm_segment_t) { (s) })
 
#define KERNEL_DS       MAKE_MM_SEG(0xFFFFFFFFFFFFFFFF)
#define USER_DS         MAKE_MM_SEG(PAGE_OFFSET)
 
#define get_ds()        (KERNEL_DS)
#define get_fs()        (current->addr_limit)
#define set_fs(x)       (current->addr_limit = (x))
 
#define segment_eq(a,b) ((a).seg == (b).seg)
 
#define __addr_ok(addr) (!((unsigned long)(addr) & (current->addr_limit.seg)))
 
/*
 * Uhhuh, this needs 65-bit arithmetic. We have a carry..
 */
#define __range_not_ok(addr,size) ({ \
        unsigned long flag,sum; \
        asm("# range_ok\n\r" \
                "addq %3,%1 ; sbbq %0,%0 ; cmpq %1,%4 ; sbbq $0,%0"  \
                :"=&r" (flag), "=r" (sum) \
                :"1" (addr),"g" ((long)(size)),"g" (current->addr_limit.seg)); \
        flag; })
 
#define access_ok(type,addr,size) (__range_not_ok(addr,size) == 0)
 
extern inline int verify_area(int type, const void * addr, unsigned long size)
{
        return access_ok(type,addr,size) ? 0 : -EFAULT;
}
 
 
/*
 * 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;
};
 
 
/*
 * These are the main single-value transfer routines.  They automatically
 * use the right size if we just have the right pointer type.
 *
 * This gets kind of ugly. We want to return _two_ values in "get_user()"
 * and yet we don't want to do any pointers, because that is too much
 * of a performance impact. Thus we have a few rather ugly macros here,
 * and hide all the ugliness from the user.
 *
 * The "__xxx" versions of the user access functions are versions that
 * do not verify the address space, that must have been done previously
 * with a separate "access_ok()" call (this is used when we do multiple
 * accesses to the same area of user memory).
 */
 
extern void __get_user_1(void);
extern void __get_user_2(void);
extern void __get_user_4(void);
extern void __get_user_8(void);
 
#define __get_user_x(size,ret,x,ptr) \
        __asm__ __volatile__("call __get_user_" #size \
                :"=a" (ret),"=d" (x) \
                :"0" (ptr) \
                :"rbx")
 
/* Careful: we have to cast the result to the type of the pointer for sign reasons */
#define get_user(x,ptr)                                                 \
({      long __val_gu;                                                  \
        int __ret_gu;                                                   \
        switch(sizeof (*(ptr))) {                                       \
        case 1:  __get_user_x(1,__ret_gu,__val_gu,ptr); break;          \
        case 2:  __get_user_x(2,__ret_gu,__val_gu,ptr); break;          \
        case 4:  __get_user_x(4,__ret_gu,__val_gu,ptr); break;          \
        case 8:  __get_user_x(8,__ret_gu,__val_gu,ptr); break;          \
        default: __get_user_bad(); break;                               \
        }                                                               \
        (x) = (__typeof__(*(ptr)))__val_gu;                             \
        __ret_gu;                                                       \
})
 
extern void __put_user_1(void);
extern void __put_user_2(void);
extern void __put_user_4(void);
extern void __put_user_8(void);
 
extern void __put_user_bad(void);
 
#define __put_user_x(size,ret,x,ptr)                                    \
        __asm__ __volatile__("call __put_user_" #size                   \
                :"=a" (ret)                                             \
                :"0" (ptr),"d" (x)                                       \
                :"rbx")
 
#define put_user(x,ptr)                                                 \
  __put_user_check((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr)))
 
#define __get_user(x,ptr) \
  __get_user_nocheck((x),(ptr),sizeof(*(ptr)))
#define __put_user(x,ptr) \
  __put_user_nocheck((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr)))
 
#define __put_user_nocheck(x,ptr,size)                  \
({                                                      \
        int __pu_err;                                   \
        __put_user_size((x),(ptr),(size),__pu_err);     \
        __pu_err;                                       \
})
 
 
#define __put_user_check(x,ptr,size)                    \
({                                                      \
        int __pu_err = -EFAULT;                         \
        __typeof__(*(ptr)) *__pu_addr = (ptr);          \
        if (access_ok(VERIFY_WRITE,__pu_addr,size))     \
                __put_user_size((x),__pu_addr,(size),__pu_err); \
        __pu_err;                                       \
})
 
#define __put_user_size(x,ptr,size,retval)                              \
do {                                                                    \
        retval = 0;                                                      \
        switch (size) {                                                 \
          case 1: __put_user_asm(x,ptr,retval,"b","b","iq",-EFAULT); break;\
          case 2: __put_user_asm(x,ptr,retval,"w","w","ir",-EFAULT); break;\
          case 4: __put_user_asm(x,ptr,retval,"l","k","ir",-EFAULT); break;\
          case 8: __put_user_asm(x,ptr,retval,"q","","ir",-EFAULT); break;\
          default: __put_user_bad();                                    \
        }                                                               \
} while (0)
 
/* FIXME: this hack is definitely wrong -AK */
struct __large_struct { unsigned long buf[100]; };
#define __m(x) (*(struct __large_struct *)(x))
 
/*
 * 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 __put_user_asm(x, addr, err, itype, rtype, ltype, errno)        \
        __asm__ __volatile__(                           \
                "1:     mov"itype" %"rtype"1,%2\n"      \
                "2:\n"                                                  \
                ".section .fixup,\"ax\"\n"              \
                "3:     mov %3,%0\n"                            \
                "       jmp 2b\n"                                       \
                ".previous\n"                                   \
                ".section __ex_table,\"a\"\n"   \
                "       .align 8\n"                                     \
                "       .quad 1b,3b\n"                          \
                ".previous"                                             \
                : "=r"(err)                                             \
                : ltype (x), "m"(__m(addr)), "i"(errno), "0"(err))
 
 
#define __get_user_nocheck(x,ptr,size)                          \
({                                                              \
        int __gu_err;                                           \
        long __gu_val;                                          \
        __get_user_size(__gu_val,(ptr),(size),__gu_err);        \
        (x) = (__typeof__(*(ptr)))__gu_val;                     \
        __gu_err;                                               \
})
 
extern int __get_user_bad(void);
 
#define __get_user_size(x,ptr,size,retval)                              \
do {                                                                    \
        retval = 0;                                                      \
        switch (size) {                                                 \
          case 1: __get_user_asm(x,ptr,retval,"b","b","=q",-EFAULT); break;\
          case 2: __get_user_asm(x,ptr,retval,"w","w","=r",-EFAULT); break;\
          case 4: __get_user_asm(x,ptr,retval,"l","k","=r",-EFAULT); break;\
          case 8: __get_user_asm(x,ptr,retval,"q","","=r",-EFAULT); break;\
          default: (x) = __get_user_bad();                              \
        }                                                               \
} while (0)
 
#define __get_user_asm(x, addr, err, itype, rtype, ltype, errno)        \
        __asm__ __volatile__(                                   \
                "1:     mov"itype" %2,%"rtype"1\n"              \
                "2:\n"                                          \
                ".section .fixup,\"ax\"\n"                      \
                "3:     mov %3,%0\n"                            \
                "       xor"itype" %"rtype"1,%"rtype"1\n"       \
                "       jmp 2b\n"                               \
                ".previous\n"                                   \
                ".section __ex_table,\"a\"\n"                   \
                "       .align 8\n"                             \
                "       .quad 1b,3b\n"                          \
                ".previous"                                     \
                : "=r"(err), ltype (x)                          \
                : "m"(__m(addr)), "i"(errno), "0"(err))
 
/*
 * Copy To/From Userspace
 */
 
/* Handles exceptions in both to and from, but doesn't do access_ok */
extern unsigned long copy_user_generic(void *to, const void *from, unsigned len);
 
extern unsigned long copy_to_user(void *to, const void *from, unsigned len);
extern unsigned long copy_from_user(void *to, const void *from, unsigned len);
extern unsigned long copy_in_user(void *to, const void *from, unsigned len);
 
static inline int __copy_from_user(void *dst, const void *src, unsigned size)
{
        if (!__builtin_constant_p(size))
                return copy_user_generic(dst,src,size);
        int ret = 0;
        switch (size) {
        case 1:__get_user_asm(*(u8*)dst,(u8 *)src,ret,"b","b","=q",1);
                return ret;
        case 2:__get_user_asm(*(u16*)dst,(u16*)src,ret,"w","w","=r",2);
                return ret;
        case 4:__get_user_asm(*(u32*)dst,(u32*)src,ret,"l","k","=r",4);
                return ret;
        case 8:__get_user_asm(*(u64*)dst,(u64*)src,ret,"q","","=r",8);
                return ret;
        case 10:
                __get_user_asm(*(u64*)dst,(u64*)src,ret,"q","","=r",16);
                if (ret) return ret;
                __get_user_asm(*(u16*)(8+(char*)dst),(u16*)(8+(char*)src),ret,"w","w","=r",2);
                return ret;
        case 16:
                __get_user_asm(*(u64*)dst,(u64*)src,ret,"q","","=r",16);
                if (ret) return ret;
                __get_user_asm(*(u64*)(8+(char*)dst),(u64*)(8+(char*)src),ret,"q","","=r",8);
                return ret;
        default:
                return copy_user_generic(dst,src,size);
        }
}
 
static inline int __copy_to_user(void *dst, const void *src, unsigned size)
{
        if (!__builtin_constant_p(size))
                return copy_user_generic(dst,src,size);
        int ret = 0;
        switch (size) {
        case 1:__put_user_asm(*(u8*)src,(u8 *)dst,ret,"b","b","iq",1);
                return ret;
        case 2:__put_user_asm(*(u16*)src,(u16*)dst,ret,"w","w","ir",2);
                return ret;
        case 4:__put_user_asm(*(u32*)src,(u32*)dst,ret,"l","k","ir",4);
                return ret;
        case 8:__put_user_asm(*(u64*)src,(u64*)dst,ret,"q","","ir",8);
                return ret;
        case 10:
                __put_user_asm(*(u64*)src,(u64*)dst,ret,"q","","ir",10);
                if (ret) return ret;
                asm("":::"memory");
                __put_user_asm(4[(u16*)src],4+(u16*)dst,ret,"w","w","ir",2);
                return ret;
        case 16:
                __put_user_asm(*(u64*)src,(u64*)dst,ret,"q","","ir",16);
                if (ret) return ret;
                asm("":::"memory");
                __put_user_asm(1[(u64*)src],1+(u64*)dst,ret,"q","","ir",8);
                return ret;
        default:
                return copy_user_generic(dst,src,size);
        }
}
 
static inline int __copy_in_user(void *dst, const void *src, unsigned size)
{
       int ret = 0;
       if (!__builtin_constant_p(size))
                return copy_user_generic(dst,src,size);
       switch (size) {
       case 1: {
               u8 tmp;
               __get_user_asm(tmp,(u8 *)src,ret,"b","b","=q",1);
               if (likely(!ret))
                       __put_user_asm(tmp,(u8 *)dst,ret,"b","b","iq",1);
               return ret;
       }
       case 2: {
               u16 tmp;
               __get_user_asm(tmp,(u16 *)src,ret,"w","w","=r",2);
               if (likely(!ret))
                       __put_user_asm(tmp,(u16 *)dst,ret,"w","w","ir",2);
               return ret;
       }
 
       case 4: {
               u32 tmp;
               __get_user_asm(tmp,(u32 *)src,ret,"l","k","=r",4);
               if (likely(!ret))
                       __put_user_asm(tmp,(u32 *)dst,ret,"l","k","ir",4);
               return ret;
       }
       case 8: {
               u64 tmp;
               __get_user_asm(tmp,(u64 *)src,ret,"q","","=r",8);
               if (likely(!ret))
                       __put_user_asm(tmp,(u64 *)dst,ret,"q","","ir",8);
               return ret;
       }
       default:
               return copy_user_generic(dst,src,size);
       }
}
 
long strncpy_from_user(char *dst, const char *src, long count);
long __strncpy_from_user(char *dst, const char *src, long count);
long strnlen_user(const char *str, long n);
long strlen_user(const char *str);
unsigned long clear_user(void *mem, unsigned long len);
unsigned long __clear_user(void *mem, unsigned long len);
 
extern unsigned long search_exception_table(unsigned long);
 
#endif /* __X86_64_UACCESS_H */

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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [include/] [asm-x86_64/] [uaccess.h] - Blame information for rev 1774

Line No.	Rev	Author	Line
1	1275	phoenix	`#ifndef __X86_64_UACCESS_H`
2			`#define __X86_64_UACCESS_H`
3
4			`/*`
5			`* User space memory access functions`
6			`*/`
7			`#include <linux/config.h>`
8			`#include <linux/errno.h>`
9			`#include <linux/sched.h>`
10			`#include <linux/prefetch.h>`
11			`#include <asm/page.h>`
12
13			`#define VERIFY_READ 0`
14			`#define VERIFY_WRITE 1`
15
16			`/*`
17			`* The fs value determines whether argument validity checking should be`
18			`* performed or not. If get_fs() == USER_DS, checking is performed, with`
19			`* get_fs() == KERNEL_DS, checking is bypassed.`
20			`*`
21			`* For historical reasons, these macros are grossly misnamed.`
22			`*/`
23
24			`#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })`
25
26			`#define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFFFFFFFFFF)`
27			`#define USER_DS MAKE_MM_SEG(PAGE_OFFSET)`
28
29			`#define get_ds() (KERNEL_DS)`
30			`#define get_fs() (current->addr_limit)`
31			`#define set_fs(x) (current->addr_limit = (x))`
32
33			`#define segment_eq(a,b) ((a).seg == (b).seg)`
34
35			`#define __addr_ok(addr) (!((unsigned long)(addr) & (current->addr_limit.seg)))`
36
37			`/*`
38			`* Uhhuh, this needs 65-bit arithmetic. We have a carry..`
39			`*/`
40			`#define __range_not_ok(addr,size) ({ \`
41			`unsigned long flag,sum; \`
42			`asm("# range_ok\n\r" \`
43			`"addq %3,%1 ; sbbq %0,%0 ; cmpq %1,%4 ; sbbq $0,%0" \`
44			`:"=&r" (flag), "=r" (sum) \`
45			`:"1" (addr),"g" ((long)(size)),"g" (current->addr_limit.seg)); \`
46			`flag; })`
47
48			`#define access_ok(type,addr,size) (__range_not_ok(addr,size) == 0)`
49
50			`extern inline int verify_area(int type, const void * addr, unsigned long size)`
51			`{`
52			`return access_ok(type,addr,size) ? 0 : -EFAULT;`
53			`}`
54
55
56			`/*`
57			`* The exception table consists of pairs of addresses: the first is the`
58			`* address of an instruction that is allowed to fault, and the second is`
59			`* the address at which the program should continue. No registers are`
60			`* modified, so it is entirely up to the continuation code to figure out`
61			`* what to do.`
62			`*`
63			`* All the routines below use bits of fixup code that are out of line`
64			`* with the main instruction path. This means when everything is well,`
65			`* we don't even have to jump over them. Further, they do not intrude`
66			`* on our cache or tlb entries.`
67			`*/`
68
69			`struct exception_table_entry`
70			`{`
71			`unsigned long insn, fixup;`
72			`};`
73
74
75			`/*`
76			`* These are the main single-value transfer routines. They automatically`
77			`* use the right size if we just have the right pointer type.`
78			`*`
79			`* This gets kind of ugly. We want to return _two_ values in "get_user()"`
80			`* and yet we don't want to do any pointers, because that is too much`
81			`* of a performance impact. Thus we have a few rather ugly macros here,`
82			`* and hide all the ugliness from the user.`
83			`*`
84			`* The "__xxx" versions of the user access functions are versions that`
85			`* do not verify the address space, that must have been done previously`
86			`* with a separate "access_ok()" call (this is used when we do multiple`
87			`* accesses to the same area of user memory).`
88			`*/`
89
90			`extern void __get_user_1(void);`
91			`extern void __get_user_2(void);`
92			`extern void __get_user_4(void);`
93			`extern void __get_user_8(void);`
94
95			`#define __get_user_x(size,ret,x,ptr) \`
96			`__asm__ __volatile__("call __get_user_" #size \`
97			`:"=a" (ret),"=d" (x) \`
98			`:"0" (ptr) \`
99			`:"rbx")`
100
101			`/* Careful: we have to cast the result to the type of the pointer for sign reasons */`
102			`#define get_user(x,ptr) \`
103			`({ long __val_gu; \`
104			`int __ret_gu; \`
105			`switch(sizeof (*(ptr))) { \`
106			`case 1: __get_user_x(1,__ret_gu,__val_gu,ptr); break; \`
107			`case 2: __get_user_x(2,__ret_gu,__val_gu,ptr); break; \`
108			`case 4: __get_user_x(4,__ret_gu,__val_gu,ptr); break; \`
109			`case 8: __get_user_x(8,__ret_gu,__val_gu,ptr); break; \`
110			`default: __get_user_bad(); break; \`
111			`} \`
112			`(x) = (__typeof__(*(ptr)))__val_gu; \`
113			`__ret_gu; \`
114			`})`
115
116			`extern void __put_user_1(void);`
117			`extern void __put_user_2(void);`
118			`extern void __put_user_4(void);`
119			`extern void __put_user_8(void);`
120
121			`extern void __put_user_bad(void);`
122
123			`#define __put_user_x(size,ret,x,ptr) \`
124			`__asm__ __volatile__("call __put_user_" #size \`
125			`:"=a" (ret) \`
126			`:"0" (ptr),"d" (x) \`
127			`:"rbx")`
128
129			`#define put_user(x,ptr) \`
130			`__put_user_check((__typeof__((ptr)))(x),(ptr),sizeof((ptr)))`
131
132			`#define __get_user(x,ptr) \`
133			`__get_user_nocheck((x),(ptr),sizeof(*(ptr)))`
134			`#define __put_user(x,ptr) \`
135			`__put_user_nocheck((__typeof__((ptr)))(x),(ptr),sizeof((ptr)))`
136
137			`#define __put_user_nocheck(x,ptr,size) \`
138			`({ \`
139			`int __pu_err; \`
140			`__put_user_size((x),(ptr),(size),__pu_err); \`
141			`__pu_err; \`
142			`})`
143
144
145			`#define __put_user_check(x,ptr,size) \`
146			`({ \`
147			`int __pu_err = -EFAULT; \`
148			`__typeof__((ptr)) __pu_addr = (ptr); \`
149			`if (access_ok(VERIFY_WRITE,__pu_addr,size)) \`
150			`__put_user_size((x),__pu_addr,(size),__pu_err); \`
151			`__pu_err; \`
152			`})`
153
154			`#define __put_user_size(x,ptr,size,retval) \`
155			`do { \`
156			`retval = 0; \`
157			`switch (size) { \`
158			`case 1: __put_user_asm(x,ptr,retval,"b","b","iq",-EFAULT); break;\`
159			`case 2: __put_user_asm(x,ptr,retval,"w","w","ir",-EFAULT); break;\`
160			`case 4: __put_user_asm(x,ptr,retval,"l","k","ir",-EFAULT); break;\`
161			`case 8: __put_user_asm(x,ptr,retval,"q","","ir",-EFAULT); break;\`
162			`default: __put_user_bad(); \`
163			`} \`
164			`} while (0)`
165
166			`/* FIXME: this hack is definitely wrong -AK */`
167			`struct __large_struct { unsigned long buf[100]; };`
168			`#define __m(x) ((struct __large_struct )(x))`
169
170			`/*`
171			`* Tell gcc we read from memory instead of writing: this is because`
172			`* we do not write to any memory gcc knows about, so there are no`
173			`* aliasing issues.`
174			`*/`
175			`#define __put_user_asm(x, addr, err, itype, rtype, ltype, errno) \`
176			`__asm__ __volatile__( \`
177			`"1: mov"itype" %"rtype"1,%2\n" \`
178			`"2:\n" \`
179			`".section .fixup,\"ax\"\n" \`
180			`"3: mov %3,%0\n" \`
181			`" jmp 2b\n" \`
182			`".previous\n" \`
183			`".section __ex_table,\"a\"\n" \`
184			`" .align 8\n" \`
185			`" .quad 1b,3b\n" \`
186			`".previous" \`
187			`: "=r"(err) \`
188			`: ltype (x), "m"(__m(addr)), "i"(errno), "0"(err))`
189
190
191			`#define __get_user_nocheck(x,ptr,size) \`
192			`({ \`
193			`int __gu_err; \`
194			`long __gu_val; \`
195			`__get_user_size(__gu_val,(ptr),(size),__gu_err); \`
196			`(x) = (__typeof__(*(ptr)))__gu_val; \`
197			`__gu_err; \`
198			`})`
199
200			`extern int __get_user_bad(void);`
201
202			`#define __get_user_size(x,ptr,size,retval) \`
203			`do { \`
204			`retval = 0; \`
205			`switch (size) { \`
206			`case 1: __get_user_asm(x,ptr,retval,"b","b","=q",-EFAULT); break;\`
207			`case 2: __get_user_asm(x,ptr,retval,"w","w","=r",-EFAULT); break;\`
208			`case 4: __get_user_asm(x,ptr,retval,"l","k","=r",-EFAULT); break;\`
209			`case 8: __get_user_asm(x,ptr,retval,"q","","=r",-EFAULT); break;\`
210			`default: (x) = __get_user_bad(); \`
211			`} \`
212			`} while (0)`
213
214			`#define __get_user_asm(x, addr, err, itype, rtype, ltype, errno) \`
215			`__asm__ __volatile__( \`
216			`"1: mov"itype" %2,%"rtype"1\n" \`
217			`"2:\n" \`
218			`".section .fixup,\"ax\"\n" \`
219			`"3: mov %3,%0\n" \`
220			`" xor"itype" %"rtype"1,%"rtype"1\n" \`
221			`" jmp 2b\n" \`
222			`".previous\n" \`
223			`".section __ex_table,\"a\"\n" \`
224			`" .align 8\n" \`
225			`" .quad 1b,3b\n" \`
226			`".previous" \`
227			`: "=r"(err), ltype (x) \`
228			`: "m"(__m(addr)), "i"(errno), "0"(err))`
229
230			`/*`
231			`* Copy To/From Userspace`
232			`*/`
233
234			`/* Handles exceptions in both to and from, but doesn't do access_ok */`
235			`extern unsigned long copy_user_generic(void to, const void from, unsigned len);`
236
237			`extern unsigned long copy_to_user(void to, const void from, unsigned len);`
238			`extern unsigned long copy_from_user(void to, const void from, unsigned len);`
239			`extern unsigned long copy_in_user(void to, const void from, unsigned len);`
240
241			`static inline int __copy_from_user(void dst, const void src, unsigned size)`
242			`{`
243			`if (!__builtin_constant_p(size))`
244			`return copy_user_generic(dst,src,size);`
245			`int ret = 0;`
246			`switch (size) {`
247			`case 1:__get_user_asm((u8)dst,(u8 *)src,ret,"b","b","=q",1);`
248			`return ret;`
249			`case 2:__get_user_asm((u16)dst,(u16*)src,ret,"w","w","=r",2);`
250			`return ret;`
251			`case 4:__get_user_asm((u32)dst,(u32*)src,ret,"l","k","=r",4);`
252			`return ret;`
253			`case 8:__get_user_asm((u64)dst,(u64*)src,ret,"q","","=r",8);`
254			`return ret;`
255			`case 10:`
256			`__get_user_asm((u64)dst,(u64*)src,ret,"q","","=r",16);`
257			`if (ret) return ret;`
258			`__get_user_asm((u16)(8+(char)dst),(u16)(8+(char*)src),ret,"w","w","=r",2);`
259			`return ret;`
260			`case 16:`
261			`__get_user_asm((u64)dst,(u64*)src,ret,"q","","=r",16);`
262			`if (ret) return ret;`
263			`__get_user_asm((u64)(8+(char)dst),(u64)(8+(char*)src),ret,"q","","=r",8);`
264			`return ret;`
265			`default:`
266			`return copy_user_generic(dst,src,size);`
267			`}`
268			`}`
269
270			`static inline int __copy_to_user(void dst, const void src, unsigned size)`
271			`{`
272			`if (!__builtin_constant_p(size))`
273			`return copy_user_generic(dst,src,size);`
274			`int ret = 0;`
275			`switch (size) {`
276			`case 1:__put_user_asm((u8)src,(u8 *)dst,ret,"b","b","iq",1);`
277			`return ret;`
278			`case 2:__put_user_asm((u16)src,(u16*)dst,ret,"w","w","ir",2);`
279			`return ret;`
280			`case 4:__put_user_asm((u32)src,(u32*)dst,ret,"l","k","ir",4);`
281			`return ret;`
282			`case 8:__put_user_asm((u64)src,(u64*)dst,ret,"q","","ir",8);`
283			`return ret;`
284			`case 10:`
285			`__put_user_asm((u64)src,(u64*)dst,ret,"q","","ir",10);`
286			`if (ret) return ret;`
287			`asm("":::"memory");`
288			`__put_user_asm(4[(u16)src],4+(u16)dst,ret,"w","w","ir",2);`
289			`return ret;`
290			`case 16:`
291			`__put_user_asm((u64)src,(u64*)dst,ret,"q","","ir",16);`
292			`if (ret) return ret;`
293			`asm("":::"memory");`
294			`__put_user_asm(1[(u64)src],1+(u64)dst,ret,"q","","ir",8);`
295			`return ret;`
296			`default:`
297			`return copy_user_generic(dst,src,size);`
298			`}`
299			`}`
300
301			`static inline int __copy_in_user(void dst, const void src, unsigned size)`
302			`{`
303			`int ret = 0;`
304			`if (!__builtin_constant_p(size))`
305			`return copy_user_generic(dst,src,size);`
306			`switch (size) {`
307			`case 1: {`
308			`u8 tmp;`
309			`__get_user_asm(tmp,(u8 *)src,ret,"b","b","=q",1);`
310			`if (likely(!ret))`
311			`__put_user_asm(tmp,(u8 *)dst,ret,"b","b","iq",1);`
312			`return ret;`
313			`}`
314			`case 2: {`
315			`u16 tmp;`
316			`__get_user_asm(tmp,(u16 *)src,ret,"w","w","=r",2);`
317			`if (likely(!ret))`
318			`__put_user_asm(tmp,(u16 *)dst,ret,"w","w","ir",2);`
319			`return ret;`
320			`}`
321
322			`case 4: {`
323			`u32 tmp;`
324			`__get_user_asm(tmp,(u32 *)src,ret,"l","k","=r",4);`
325			`if (likely(!ret))`
326			`__put_user_asm(tmp,(u32 *)dst,ret,"l","k","ir",4);`
327			`return ret;`
328			`}`
329			`case 8: {`
330			`u64 tmp;`
331			`__get_user_asm(tmp,(u64 *)src,ret,"q","","=r",8);`
332			`if (likely(!ret))`
333			`__put_user_asm(tmp,(u64 *)dst,ret,"q","","ir",8);`
334			`return ret;`
335			`}`
336			`default:`
337			`return copy_user_generic(dst,src,size);`
338			`}`
339			`}`
340
341			`long strncpy_from_user(char dst, const char src, long count);`
342			`long __strncpy_from_user(char dst, const char src, long count);`
343			`long strnlen_user(const char *str, long n);`
344			`long strlen_user(const char *str);`
345			`unsigned long clear_user(void *mem, unsigned long len);`
346			`unsigned long __clear_user(void *mem, unsigned long len);`
347
348			`extern unsigned long search_exception_table(unsigned long);`
349
350			`#endif /* __X86_64_UACCESS_H */`