175 lines
4.4 KiB
C
175 lines
4.4 KiB
C
#ifndef __M68KNOMMU_UACCESS_H
|
|
#define __M68KNOMMU_UACCESS_H
|
|
|
|
/*
|
|
* User space memory access functions
|
|
*/
|
|
#include <linux/sched.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/string.h>
|
|
|
|
#include <asm/segment.h>
|
|
|
|
#define VERIFY_READ 0
|
|
#define VERIFY_WRITE 1
|
|
|
|
#define access_ok(type,addr,size) _access_ok((unsigned long)(addr),(size))
|
|
|
|
/*
|
|
* It is not enough to just have access_ok check for a real RAM address.
|
|
* This would disallow the case of code/ro-data running XIP in flash/rom.
|
|
* Ideally we would check the possible flash ranges too, but that is
|
|
* currently not so easy.
|
|
*/
|
|
static inline int _access_ok(unsigned long addr, unsigned long size)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
|
|
#define put_user(x, ptr) \
|
|
({ \
|
|
int __pu_err = 0; \
|
|
typeof(*(ptr)) __pu_val = (x); \
|
|
switch (sizeof (*(ptr))) { \
|
|
case 1: \
|
|
__put_user_asm(__pu_err, __pu_val, ptr, b); \
|
|
break; \
|
|
case 2: \
|
|
__put_user_asm(__pu_err, __pu_val, ptr, w); \
|
|
break; \
|
|
case 4: \
|
|
__put_user_asm(__pu_err, __pu_val, ptr, l); \
|
|
break; \
|
|
case 8: \
|
|
memcpy(ptr, &__pu_val, sizeof (*(ptr))); \
|
|
break; \
|
|
default: \
|
|
__pu_err = __put_user_bad(); \
|
|
break; \
|
|
} \
|
|
__pu_err; \
|
|
})
|
|
#define __put_user(x, ptr) put_user(x, ptr)
|
|
|
|
extern int __put_user_bad(void);
|
|
|
|
/*
|
|
* 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 __ptr(x) ((unsigned long *)(x))
|
|
|
|
#define __put_user_asm(err,x,ptr,bwl) \
|
|
__asm__ ("move" #bwl " %0,%1" \
|
|
: /* no outputs */ \
|
|
:"d" (x),"m" (*__ptr(ptr)) : "memory")
|
|
|
|
#define get_user(x, ptr) \
|
|
({ \
|
|
int __gu_err = 0; \
|
|
typeof(x) __gu_val = 0; \
|
|
switch (sizeof(*(ptr))) { \
|
|
case 1: \
|
|
__get_user_asm(__gu_err, __gu_val, ptr, b, "=d"); \
|
|
break; \
|
|
case 2: \
|
|
__get_user_asm(__gu_err, __gu_val, ptr, w, "=r"); \
|
|
break; \
|
|
case 4: \
|
|
__get_user_asm(__gu_err, __gu_val, ptr, l, "=r"); \
|
|
break; \
|
|
case 8: \
|
|
memcpy((void *) &__gu_val, ptr, sizeof (*(ptr))); \
|
|
break; \
|
|
default: \
|
|
__gu_val = 0; \
|
|
__gu_err = __get_user_bad(); \
|
|
break; \
|
|
} \
|
|
(x) = (typeof(*(ptr))) __gu_val; \
|
|
__gu_err; \
|
|
})
|
|
#define __get_user(x, ptr) get_user(x, ptr)
|
|
|
|
extern int __get_user_bad(void);
|
|
|
|
#define __get_user_asm(err,x,ptr,bwl,reg) \
|
|
__asm__ ("move" #bwl " %1,%0" \
|
|
: "=d" (x) \
|
|
: "m" (*__ptr(ptr)))
|
|
|
|
#define copy_from_user(to, from, n) (memcpy(to, from, n), 0)
|
|
#define copy_to_user(to, from, n) (memcpy(to, from, n), 0)
|
|
|
|
#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)
|
|
#define __copy_to_user_inatomic __copy_to_user
|
|
#define __copy_from_user_inatomic __copy_from_user
|
|
|
|
/*
|
|
* Copy a null terminated string from userspace.
|
|
*/
|
|
|
|
static inline long
|
|
strncpy_from_user(char *dst, const char *src, long count)
|
|
{
|
|
char *tmp;
|
|
strncpy(dst, src, count);
|
|
for (tmp = dst; *tmp && count > 0; tmp++, count--)
|
|
;
|
|
return(tmp - dst); /* DAVIDM should we count a NUL ? check getname */
|
|
}
|
|
|
|
/*
|
|
* Return the size of a string (including the ending 0)
|
|
*
|
|
* Return 0 on exception, a value greater than N if too long
|
|
*/
|
|
static inline long strnlen_user(const char *src, long n)
|
|
{
|
|
return(strlen(src) + 1); /* DAVIDM make safer */
|
|
}
|
|
|
|
#define strlen_user(str) strnlen_user(str, 32767)
|
|
|
|
/*
|
|
* Zero Userspace
|
|
*/
|
|
|
|
static inline unsigned long
|
|
__clear_user(void *to, unsigned long n)
|
|
{
|
|
memset(to, 0, n);
|
|
return 0;
|
|
}
|
|
|
|
#define clear_user(to,n) __clear_user(to,n)
|
|
|
|
#endif /* _M68KNOMMU_UACCESS_H */
|