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OS/2 Shareware BBS: 10 Tools
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10-Tools.zip
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lxapi32.zip
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Include
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asm
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uaccess.h
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C/C++ Source or Header
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2002-04-26
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8KB
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254 lines
/* $Id: uaccess.h,v 1.2 2002/04/26 23:09:21 smilcke Exp $ */
#ifndef __i386_UACCESS_H
#define __i386_UACCESS_H
/*
* User space memory access functions
*/
//#include <linux/config.h>
//#include <linux/sched.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(0xFFFFFFFF)
#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)
extern int __verify_write(const void *, unsigned long);
#define __addr_ok(addr) ((unsigned long)(addr) < (current->addr_limit.seg))
/*
* Uhhuh, this needs 33-bit arithmetic. We have a carry..
*/
#if (defined(TARGET_OS2) && !defined(NOOS2LXAPI))
extern int (*is_access_ok)(int type,void *addr,unsigned long size);
#else
int is_access_ok(int type, void *addr, unsigned long size);
#endif
#define access_ok(type, addr, size) is_access_ok((int)type, (void *)addr, size)
#define verify_area(type, addr, size) (access_ok(type, (void *)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;
};
/* 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.
*
* 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.
*
* 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).
*/
/* Careful: we have to cast the result to the type of the pointer for sign reasons */
#if (defined(TARGET_OS2) && !defined(NOOS2LXAPI))
extern int (*get_user)(int size,void *dest,void *src);
#else
int get_user(int size, void *dest, void *src);
#endif
extern void __put_user_bad(void);
#if (defined(TARGET_OS2) && !defined(NOOS2LXAPI))
extern int (*put_user)(int x,void *ptr);
#else
int put_user(int x, void *ptr);
#endif
#define __get_user(x,ptr) \
__get_user_nocheck((x),(ptr),sizeof(*(ptr)))
int __put_user(int size, int x, void *ptr);
#define __put_user_nocheck(x,ptr,size) lksjdflksdjf
#define __put_user_size(x,ptr,size,retval) asdlkfjsdklfj
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) lksjdf
#define __get_user_nocheck(x,ptr,size) lsjdf
extern long __get_user_bad(void);
#define __get_user_size(x,ptr,size,retval) ksjdf
#define __get_user_asm(x, addr, err, itype, rtype, ltype) sldkjf
/*
* The "xxx_ret" versions return constant specified in third argument, if
* something bad happens. These macros can be optimized for the
* case of just returning from the function xxx_ret is used.
*/
#define put_user_ret(x,ptr,ret) ({ if (put_user(x,ptr)) return ret; })
#define get_user_ret(x,ptr,ret) if (get_user(sizeof(x), (void *)&x, (void *)ptr)) return ret;
/*
* Copy To/From Userspace
*/
/* Generic arbitrary sized copy. */
#if (defined(TARGET_OS2) && !defined(NOOS2LXAPI))
extern void (*__copy_user)(void *to,const void *from,unsigned long n);
#else
void __copy_user(void *to, const void *from, unsigned long n);
#endif
#if (defined(TARGET_OS2) && !defined(NOOS2LXAPI))
extern void (*__copy_user_zeroing)(void *to,const void *from,unsigned long n);
#else
void __copy_user_zeroing(void *to, const void *from, unsigned long n);
#endif
/* We let the __ versions of copy_from/to_user inline, because they're often
* used in fast paths and have only a small space overhead.
*/
static __inline unsigned long
__generic_copy_from_user_nocheck(void *to, const void *from, unsigned long n)
{
__copy_user_zeroing(to,from,n);
return n;
}
static __inline unsigned long
__generic_copy_to_user_nocheck(void *to, const void *from, unsigned long n)
{
__copy_user(to,from,n);
return n;
}
/* Optimize just a little bit when we know the size of the move. */
void __constant_copy_user(void *to, const void *from, unsigned long n);
/* Optimize just a little bit when we know the size of the move. */
void __constant_copy_user_zeroing(void *to, const void *from, unsigned long n);
unsigned long __generic_copy_to_user(void *, const void *, unsigned long);
unsigned long __generic_copy_from_user(void *, const void *, unsigned long);
static __inline unsigned long
__constant_copy_to_user(void *to, const void *from, unsigned long n)
{
if (access_ok(VERIFY_WRITE, to, n))
__constant_copy_user(to,from,n);
return n;
}
static __inline unsigned long
__constant_copy_from_user(void *to, const void *from, unsigned long n)
{
if (access_ok(VERIFY_READ, (void *)from, n))
__constant_copy_user_zeroing(to,from,n);
return n;
}
static __inline unsigned long
__constant_copy_to_user_nocheck(void *to, const void *from, unsigned long n)
{
__constant_copy_user(to,from,n);
return n;
}
static __inline unsigned long
__constant_copy_from_user_nocheck(void *to, const void *from, unsigned long n)
{
__constant_copy_user_zeroing(to,from,n);
return n;
}
#if (defined(TARGET_OS2) && !defined(NOOS2LXAPI))
extern unsigned long (*copy_to_user)(void *to,const void *from,unsigned long n);
#else
unsigned long copy_to_user(void *to, const void *from, unsigned long n);
#endif
#if (defined(TARGET_OS2) && !defined(NOOS2LXAPI))
extern unsigned long (*copy_from_user)(void *to,const void *from,unsigned long n);
#else
unsigned long copy_from_user(void *to, const void *from, unsigned long n);
#endif
#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; })
#define __copy_to_user(to,from,n) \
(__builtin_constant_p(n) ? \
__constant_copy_to_user_nocheck((to),(from),(n)) : \
__generic_copy_to_user_nocheck((to),(from),(n)))
#define __copy_from_user(to,from,n) \
(__builtin_constant_p(n) ? \
__constant_copy_from_user_nocheck((to),(from),(n)) : \
__generic_copy_from_user_nocheck((to),(from),(n)))
long strncpy_from_user(char *dst, const char *src, long count);
long __strncpy_from_user(char *dst, const char *src, long count);
#define strlen_user(str) strnlen_user(str, ~0UL >> 1)
long strnlen_user(const char *str, long n);
unsigned long clear_user(void *mem, unsigned long len);
unsigned long __clear_user(void *mem, unsigned long len);
#endif /* __i386_UACCESS_H */