/*
* include/asm-s390/uaccess.h
*
* S390 version
* Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
* Author(s): Hartmut Penner (hp@de.ibm.com),
* Martin Schwidefsky (schwidefsky@de.ibm.com)
*
* Derived from "include/asm-i386/uaccess.h"
*/
#ifndef __S390_UACCESS_H
#define __S390_UACCESS_H
/*
* User space memory access functions
*/
#include <linux/sched.h>
#include <linux/errno.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(a) ((mm_segment_t) { (a) })
#define KERNEL_DS MAKE_MM_SEG(0)
#define USER_DS MAKE_MM_SEG(1)
#define get_ds() (KERNEL_DS)
#define get_fs() (current->thread.mm_segment)
#ifdef __s390x__
#define set_fs(x) \
({ \
unsigned long __pto; \
current->thread.mm_segment = (x); \
__pto = current->thread.mm_segment.ar4 ? \
S390_lowcore.user_asce : S390_lowcore.kernel_asce; \
asm volatile ("lctlg 7,7,%0" : : "m" (__pto) ); \
})
#else
#define set_fs(x) \
({ \
unsigned long __pto; \
current->thread.mm_segment = (x); \
__pto = current->thread.mm_segment.ar4 ? \
S390_lowcore.user_asce : S390_lowcore.kernel_asce; \
asm volatile ("lctl 7,7,%0" : : "m" (__pto) ); \
})
#endif
#define segment_eq(a,b) ((a).ar4 == (b).ar4)
static inline int __access_ok(const void __user *addr, unsigned long size)
{
return 1;
}
#define access_ok(type,addr,size) __access_ok(addr,size)
/*
* 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;
};
#ifndef __s390x__
#define __uaccess_fixup \
".section .fixup,\"ax\"\n" \
"2: lhi %0,%4\n" \
" bras 1,3f\n" \
" .long 1b\n" \
"3: l 1,0(1)\n" \
" br 1\n" \
".previous\n" \
".section __ex_table,\"a\"\n" \
" .align 4\n" \
" .long 0b,2b\n" \
".previous"
#define __uaccess_clobber "cc", "1"
#else /* __s390x__ */
#define __uaccess_fixup \
".section .fixup,\"ax\"\n" \
"2: lghi %0,%4\n" \
" jg 1b\n" \
".previous\n" \
".section __ex_table,\"a\"\n" \
" .align 8\n" \
" .quad 0b,2b\n" \
".previous"
#define __uaccess_clobber "cc"
#endif /* __s390x__ */
/*
* These are the main single-value transfer routines. They automatically
* use the right size if we just have the right pointer type.
*/
#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 2)
#define __put_user_asm(x, ptr, err) \
({ \
err = 0; \
asm volatile( \
"0: mvcs 0(%1,%2),%3,%0\n" \
"1:\n" \
__uaccess_fixup \
: "+&d" (err) \
: "d" (sizeof(*(ptr))), "a" (ptr), "Q" (x), \
"K" (-EFAULT) \
: __uaccess_clobber ); \
})
#else
#define __put_user_asm(x, ptr, err) \
({ \
err = 0; \
asm volatile( \
"0: mvcs 0(%1,%2),0(%3),%0\n" \
"1:\n" \
__uaccess_fixup \
: "+&d" (err) \
: "d" (sizeof(*(ptr))), "a" (ptr), "a" (&(x)), \
"K" (-EFAULT), "m" (x) \
: __uaccess_clobber ); \
})
#endif
#define __put_user(x, ptr) \
({ \
__typeof__(*(ptr)) __x = (x); \
int __pu_err; \
__chk_user_ptr(ptr); \
switch (sizeof (*(ptr))) { \
case 1: \
case 2: \
case 4: \
case 8: \
__put_user_asm(__x, ptr, __pu_err); \
break; \
default: \
__put_user_bad(); \
break; \
} \
__pu_err; \
})
#define put_user(x, ptr) \
({ \
might_sleep(); \
__put_user(x, ptr); \
})
extern int __put_user_bad(void) __attribute__((noreturn));
#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 2)
#define __get_user_asm(x, ptr, err) \
({ \
err = 0; \
asm volatile ( \
"0: mvcp %O1(%2,%R1),0(%3),%0\n" \
"1:\n" \
__uaccess_fixup \
: "+&d" (err), "=Q" (x) \
: "d" (sizeof(*(ptr))), "a" (ptr), \
"K" (-EFAULT) \
: __uaccess_clobber ); \
})
#else
#define __get_user_asm(x, ptr, err) \
({ \
err = 0; \
asm volatile ( \
"0: mvcp 0(%2,%5),0(%3),%0\n" \
"1:\n" \
__uaccess_fixup \
: "+&d" (err), "=m" (x) \
: "d" (sizeof(*(ptr))), "a" (ptr), \
"K" (-EFAULT), "a" (&(x)) \
: __uaccess_clobber ); \
})
#endif
#define __get_user(x, ptr) \
({ \
int __gu_err; \
__chk_user_ptr(ptr); \
switch (sizeof(*(ptr))) { \
case 1: { \
unsigned char __x; \
__get_user_asm(__x, ptr, __gu_err); \
(x) = *(__force __typeof__(*(ptr)) *) &__x; \
break; \
}; \
case 2: { \
unsigned short __x; \
__get_user_asm(__x, ptr, __gu_err); \
(x) = *(__force __typeof__(*(ptr)) *) &__x; \
break; \
}; \
case 4: { \
unsigned int __x; \
__get_user_asm(__x, ptr, __gu_err); \
(x) = *(__force __typeof__(*(ptr)) *) &__x; \
break; \
}; \
case 8: { \
unsigned long long __x; \
__get_user_asm(__x, ptr, __gu_err); \
(x) = *(__force __typeof__(*(ptr)) *) &__x; \
break; \
}; \
default: \
__get_user_bad(); \
break; \
} \
__gu_err; \
})
#define get_user(x, ptr) \
({ \
might_sleep(); \
__get_user(x, ptr); \
})
extern int __get_user_bad(void) __attribute__((noreturn));
#define __put_user_unaligned __put_user
#define __get_user_unaligned __get_user
extern long __copy_to_user_asm(const void *from, long n, void __user *to);
/**
* __copy_to_user: - Copy a block of data into user space, with less checking.
* @to: Destination address, in user space.
* @from: Source address, in kernel space.
* @n: Number of bytes to copy.
*
* Context: User context only. This function may sleep.
*
* Copy data from kernel space to user space. Caller must check
* the specified block with access_ok() before calling this function.
*
* Returns number of bytes that could not be copied.
* On success, this will be zero.
*/
static inline unsigned long
__copy_to_user(void __user *to, const void *from, unsigned long n)
{
return __copy_to_user_asm(from, n, to);
}
#define __copy_to_user_inatomic __copy_to_user
#define __copy_from_user_inatomic __copy_from_user
/**
* copy_to_user: - Copy a block of data into user space.
* @to: Destination address, in user space.
* @from: Source address, in kernel space.
* @n: Number of bytes to copy.
*
* Context: User context only. This function may sleep.
*
* Copy data from kernel space to user space.
*
* Returns number of bytes that could not be copied.
* On success, this will be zero.
*/
static inline unsigned long
copy_to_user(void __user *to, const void *from, unsigned long n)
{
might_sleep();
if (access_ok(VERIFY_WRITE, to, n))
n = __copy_to_user(to, from, n);
return n;
}
extern long __copy_from_user_asm(void *to, long n, const void __user *from);
/**
* __copy_from_user: - Copy a block of data from user space, with less checking.
* @to: Destination address, in kernel space.
* @from: Source address, in user space.
* @n: Number of bytes to copy.
*
* Context: User context only. This function may sleep.
*
* Copy data from user space to kernel space. Caller must check
* the specified block with access_ok() before calling this function.
*
* Returns number of bytes that could not be copied.
* On success, this will be zero.
*
* If some data could not be copied, this function will pad the copied
* data to the requested size using zero bytes.
*/
static inline unsigned long
__copy_from_user(void *to, const void __user *from, unsigned long n)
{
return __copy_from_user_asm(to, n, from);
}
/**
* copy_from_user: - Copy a block of data from user space.
* @to: Destination address, in kernel space.
* @from: Source address, in user space.
* @n: Number of bytes to copy.
*
* Context: User context only. This function may sleep.
*
* Copy data from user space to kernel space.
*
* Returns number of bytes that could not be copied.
* On success, this will be zero.
*
* If some data could not be copied, this function will pad the copied
* data to the requested size using zero bytes.
*/
static inline unsigned long
copy_from_user(void *to, const void __user *from, unsigned long n)
{
might_sleep();
if (access_ok(VERIFY_READ, from, n))
n = __copy_from_user(to, from, n);
else
memset(to, 0, n);
return n;
}
extern unsigned long __copy_in_user_asm(const void __user *from, long n,
void __user *to);
static inline unsigned long
__copy_in_user(void __user *to, const void __user *from, unsigned long n)
{
return __copy_in_user_asm(from, n, to);
}
static inline unsigned long
copy_in_user(void __user *to, const void __user *from, unsigned long n)
{
might_sleep();
if (__access_ok(from,n) && __access_ok(to,n))
n = __copy_in_user_asm(from, n, to);
return n;
}
/*
* Copy a null terminated string from userspace.
*/
extern long __strncpy_from_user_asm(long count, char *dst,
const char __user *src);
static inline long
strncpy_from_user(char *dst, const char __user *src, long count)
{
long res = -EFAULT;
might_sleep();
if (access_ok(VERIFY_READ, src, 1))
res = __strncpy_from_user_asm(count, dst, src);
return res;
}
extern long __strnlen_user_asm(long count, const char __user *src);
static inline unsigned long
strnlen_user(const char __user * src, unsigned long n)
{
might_sleep();
return __strnlen_user_asm(n, src);
}
/**
* strlen_user: - Get the size of a string in user space.
* @str: The string to measure.
*
* Context: User context only. This function may sleep.
*
* Get the size of a NUL-terminated string in user space.
*
* Returns the size of the string INCLUDING the terminating NUL.
* On exception, returns 0.
*
* If there is a limit on the length of a valid string, you may wish to
* consider using strnlen_user() instead.
*/
#define strlen_user(str) strnlen_user(str, ~0UL)
/*
* Zero Userspace
*/
extern long __clear_user_asm(void __user *to, long n);
static inline unsigned long
__clear_user(void __user *to, unsigned long n)
{
return __clear_user_asm(to, n);
}
static inline unsigned long
clear_user(void __user *to, unsigned long n)
{
might_sleep();
if (access_ok(VERIFY_WRITE, to, n))
n = __clear_user_asm(to, n);
return n;
}
#endif /* __S390_UACCESS_H */
