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/* $Id: uaccess.h,v 1.2 1996/10/31 00:59:56 davem Exp $ */
#ifndef _ASM_UACCESS_H
#define _ASM_UACCESS_H
/*
* User space memory access functions
*/
#ifdef __KERNEL__
#include <linux/sched.h>
#include <linux/string.h>
#include <asm/vac-ops.h>
#endif
#ifndef __ASSEMBLY__
/* Sparc is not segmented, however we need to be able to fool verify_area()
* when doing system calls from kernel mode legitimately.
*
* "For historical reasons, these macros are grossly misnamed." -Linus
*/
#define KERNEL_DS 0
#define USER_DS 1
#define VERIFY_READ 0
#define VERIFY_WRITE 1
#define get_fs() (current->tss.current_ds)
#define get_ds() (KERNEL_DS)
#define set_fs(val) ((current->tss.current_ds) = (val))
#define __user_ok(addr,size) (((size) <= page_offset)&&((addr) <= page_offset-(size)))
#define __kernel_ok (get_fs() == KERNEL_DS)
#define __access_ok(addr,size) (__kernel_ok || __user_ok((addr),(size)))
#define access_ok(type,addr,size) __access_ok((unsigned long)(addr),(size))
extern inline int verify_area(int type, const void * addr, unsigned long size)
{
return access_ok(type,addr,size)?0:-EFAULT;
}
/* Uh, these should become 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 uglyness from the user.
*/
#define put_user(x,ptr) ({ \
unsigned long __pu_addr = (unsigned long)(ptr); \
__put_user_check((__typeof__(*(ptr)))(x),__pu_addr,sizeof(*(ptr))); })
#define get_user(x,ptr) ({ \
unsigned long __gu_addr = (unsigned long)(ptr); \
__get_user_check((x),__gu_addr,sizeof(*(ptr)),__typeof__(*(ptr))); })
/*
* The "__xxx" versions do not do address space checking, useful when
* doing multiple accesses to the same area (the user has to do the
* checks by hand with "access_ok()")
*/
#define __put_user(x,ptr) __put_user_nocheck((x),(ptr),sizeof(*(ptr)))
#define __get_user(x,ptr) __get_user_nocheck((x),(ptr),sizeof(*(ptr)),__typeof__(*(ptr)))
struct __large_struct { unsigned long buf[100]; };
#define __m(x) ((struct __large_struct *)(x))
#define __put_user_check(x,addr,size) ({ \
register int __pu_ret asm("g1"); \
__pu_ret = -EFAULT; \
if (__access_ok(addr,size)) { \
switch (size) { \
case 1: __put_user_8(x,addr,__pu_ret); break; \
case 2: __put_user_16(x,addr,__pu_ret); break; \
case 4: __put_user_32(x,addr,__pu_ret); break; \
default: __pu_ret = __put_user_bad(); break; \
} } __pu_ret; })
#define __put_user_nocheck(x,addr,size) ({ \
register int __pu_ret asm("g1"); \
__pu_ret = -EFAULT; \
switch (size) { \
case 1: __put_user_8(x,addr,__pu_ret); break; \
case 2: __put_user_16(x,addr,__pu_ret); break; \
case 4: __put_user_32(x,addr,__pu_ret); break; \
default: __pu_ret = __put_user_bad(); break; \
} __pu_ret; })
#define __put_user_8(x,addr,ret) \
__asm__ __volatile( \
"/* Put user 8, inline. */\n\t" \
"ld [%%g6 + %3], %%g2\n\t" \
"set 1f, %0\n\t" \
"add %%g2, 1, %%g3\n\t" \
"st %0, [%%g6 + %4]\n\t" \
"st %%g3, [%%g6 + %3]\n\t" \
"stb %1, [%2]\n\t" \
"mov 0, %0\n\t" \
"st %%g2, [%%g6 + %3]\n" \
"1:\n" : "=&r" (ret) : "r" (x), "r" (__m(addr)), \
"i" ((const unsigned long)(&((struct task_struct *)0)->tss.ex.count)), \
"i" ((const unsigned long)(&((struct task_struct *)0)->tss.ex.expc)) \
: "g2", "g3")
#define __put_user_16(x,addr,ret) \
__asm__ __volatile( \
"/* Put user 16, inline. */\n\t" \
"ld [%%g6 + %3], %%g2\n\t" \
"set 1f, %0\n\t" \
"add %%g2, 1, %%g3\n\t" \
"st %0, [%%g6 + %4]\n\t" \
"st %%g3, [%%g6 + %3]\n\t" \
"sth %1, [%2]\n\t" \
"mov 0, %0\n\t" \
"st %%g2, [%%g6 + %3]\n" \
"1:\n" : "=&r" (ret) : "r" (x), "r" (__m(addr)), \
"i" ((const unsigned long)(&((struct task_struct *)0)->tss.ex.count)), \
"i" ((const unsigned long)(&((struct task_struct *)0)->tss.ex.expc)) \
: "g2", "g3")
#define __put_user_32(x,addr,ret) \
__asm__ __volatile( \
"/* Put user 32, inline. */\n\t" \
"ld [%%g6 + %3], %%g2\n\t" \
"set 1f, %0\n\t" \
"add %%g2, 1, %%g3\n\t" \
"st %0, [%%g6 + %4]\n\t" \
"st %%g3, [%%g6 + %3]\n\t" \
"st %1, [%2]\n\t" \
"mov 0, %0\n\t" \
"st %%g2, [%%g6 + %3]\n" \
"1:\n" : "=&r" (ret) : "r" (x), "r" (__m(addr)), \
"i" ((const unsigned long)(&((struct task_struct *)0)->tss.ex.count)), \
"i" ((const unsigned long)(&((struct task_struct *)0)->tss.ex.expc)) \
: "g2", "g3")
extern int __put_user_bad(void);
#define __get_user_check(x,addr,size,type) ({ \
register int __gu_ret asm("g1"); \
register unsigned long __gu_val = 0; \
__gu_ret = -EFAULT; \
if (__access_ok(addr,size)) { \
switch (size) { \
case 1: __get_user_8(__gu_val,addr,__gu_ret); break; \
case 2: __get_user_16(__gu_val,addr,__gu_ret); break; \
case 4: __get_user_32(__gu_val,addr,__gu_ret); break; \
default: __gu_ret = __get_user_bad(); break; \
} } x = (type) __gu_val; __gu_ret; })
#define __get_user_nocheck(x,addr,size,type) ({ \
register int __gu_ret asm("g1"); \
register unsigned long __gu_val = 0; \
__gu_ret = -EFAULT; \
switch (size) { \
case 1: __get_user_8(__gu_val,addr,__gu_ret); break; \
case 2: __get_user_16(__gu_val,addr,__gu_ret); break; \
case 4: __get_user_32(__gu_val,addr,__gu_ret); break; \
default: __gu_ret = __get_user_bad(); break; \
} x = (type) __gu_val; __gu_ret; })
#define __get_user_8(x,addr,ret) \
__asm__ __volatile__( \
"/* Get user 8, inline. */\n\t" \
"ld [%%g6 + %3], %%g2\n\t" \
"set 1f, %0\n\t" \
"add %%g2, 1, %%g3\n\t" \
"st %0, [%%g6 + %4]\n\t" \
"st %%g3, [%%g6 + %3]\n\t" \
"ldub [%2], %1\n\t" \
"mov 0, %0\n\t" \
"st %%g2, [%%g6 + %3]\n" \
"1:\n" : "=&r" (ret), "=&r" (x) : "r" (__m(addr)), \
"i" ((const unsigned long)(&((struct task_struct *)0)->tss.ex.count)), \
"i" ((const unsigned long)(&((struct task_struct *)0)->tss.ex.expc)) \
: "g2", "g3")
#define __get_user_16(x,addr,ret) \
__asm__ __volatile__( \
"/* Get user 16, inline. */\n\t" \
"ld [%%g6 + %3], %%g2\n\t" \
"set 1f, %0\n\t" \
"add %%g2, 1, %%g3\n\t" \
"st %0, [%%g6 + %4]\n\t" \
"st %%g3, [%%g6 + %3]\n\t" \
"lduh [%2], %1\n\t" \
"mov 0, %0\n\t" \
"st %%g2, [%%g6 + %3]\n" \
"1:\n" : "=&r" (ret), "=&r" (x) : "r" (__m(addr)), \
"i" ((const unsigned long)(&((struct task_struct *)0)->tss.ex.count)), \
"i" ((const unsigned long)(&((struct task_struct *)0)->tss.ex.expc)) \
: "g2", "g3")
#define __get_user_32(x,addr,ret) \
__asm__ __volatile__( \
"/* Get user 32, inline. */\n\t" \
"ld [%%g6 + %3], %%g2\n\t" \
"set 1f, %0\n\t" \
"add %%g2, 1, %%g3\n\t" \
"st %0, [%%g6 + %4]\n\t" \
"st %%g3, [%%g6 + %3]\n\t" \
"ld [%2], %1\n\t" \
"mov 0, %0\n\t" \
"st %%g2, [%%g6 + %3]\n" \
"1:\n" : "=&r" (ret), "=&r" (x) : "r" (__m(addr)), \
"i" ((const unsigned long)(&((struct task_struct *)0)->tss.ex.count)), \
"i" ((const unsigned long)(&((struct task_struct *)0)->tss.ex.expc)) \
: "g2", "g3")
extern int __get_user_bad(void);
extern int __copy_to_user(unsigned long to, unsigned long from, int size);
extern int __copy_from_user(unsigned long to, unsigned long from, int size);
#define copy_to_user(to,from,n) ({ \
unsigned long __copy_to = (unsigned long) (to); \
unsigned long __copy_size = (unsigned long) (n); \
unsigned long __copy_res; \
if(__copy_size && __access_ok(__copy_to, __copy_size)) { \
__copy_res = __copy_to_user(__copy_to, (unsigned long) (from), __copy_size); \
if(__copy_res) __copy_res = __copy_size - __copy_res; \
} else __copy_res = __copy_size; \
__copy_res; })
#define copy_from_user(to,from,n) ({ \
unsigned long __copy_from = (unsigned long) (from); \
unsigned long __copy_size = (unsigned long) (n); \
unsigned long __copy_res; \
if(__copy_size && __access_ok(__copy_from, __copy_size)) { \
__copy_res = __copy_from_user((unsigned long) (to), __copy_from, __copy_size); \
if(__copy_res) __copy_res = __copy_size - __copy_res; \
} else __copy_res = __copy_size; \
__copy_res; })
extern int __clear_user(unsigned long addr, int size);
#define clear_user(addr,n) ({ \
unsigned long __clear_addr = (unsigned long) (addr); \
int __clear_size = (int) (n); \
int __clear_res; \
if(__clear_size && __access_ok(__clear_addr, __clear_size)) { \
__clear_res = __clear_user(__clear_addr, __clear_size); \
if(__clear_res) __clear_res = __clear_size - __clear_res; \
} else __clear_res = __clear_size; \
__clear_res; })
extern int __strncpy_from_user(unsigned long dest, unsigned long src, int count);
#define strncpy_from_user(dest,src,count) ({ \
unsigned long __sfu_src = (unsigned long) (src); \
int __sfu_count = (int) (count); \
long __sfu_res = -EFAULT; \
if(__access_ok(__sfu_src, __sfu_count)) { \
__sfu_res = __strncpy_from_user((unsigned long) (dest), __sfu_src, __sfu_count); \
} __sfu_res; })
#endif /* __ASSEMBLY__ */
#endif /* _ASM_UACCESS_H */
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