You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
273 lines
8.0 KiB
273 lines
8.0 KiB
/*
|
|
* OpenRISC Linux
|
|
*
|
|
* Linux architectural port borrowing liberally from similar works of
|
|
* others. All original copyrights apply as per the original source
|
|
* declaration.
|
|
*
|
|
* OpenRISC implementation:
|
|
* Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
|
|
* Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
|
|
* et al.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*/
|
|
|
|
#ifndef __ASM_OPENRISC_UACCESS_H
|
|
#define __ASM_OPENRISC_UACCESS_H
|
|
|
|
/*
|
|
* User space memory access functions
|
|
*/
|
|
#include <linux/prefetch.h>
|
|
#include <linux/string.h>
|
|
#include <asm/page.h>
|
|
#include <asm/extable.h>
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
|
|
/* addr_limit is the maximum accessible address for the task. we misuse
|
|
* the KERNEL_DS and USER_DS values to both assign and compare the
|
|
* addr_limit values through the equally misnamed get/set_fs macros.
|
|
* (see above)
|
|
*/
|
|
|
|
#define KERNEL_DS (~0UL)
|
|
#define get_ds() (KERNEL_DS)
|
|
|
|
#define USER_DS (TASK_SIZE)
|
|
#define get_fs() (current_thread_info()->addr_limit)
|
|
#define set_fs(x) (current_thread_info()->addr_limit = (x))
|
|
|
|
#define segment_eq(a, b) ((a) == (b))
|
|
|
|
/* Ensure that the range from addr to addr+size is all within the process'
|
|
* address space
|
|
*/
|
|
#define __range_ok(addr, size) (size <= get_fs() && addr <= (get_fs()-size))
|
|
|
|
/* Ensure that addr is below task's addr_limit */
|
|
#define __addr_ok(addr) ((unsigned long) addr < get_fs())
|
|
|
|
#define access_ok(type, addr, size) \
|
|
({ \
|
|
unsigned long __ao_addr = (unsigned long)(addr); \
|
|
unsigned long __ao_size = (unsigned long)(size); \
|
|
__range_ok(__ao_addr, __ao_size); \
|
|
})
|
|
|
|
/*
|
|
* 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).
|
|
*
|
|
* As we use the same address space for kernel and user data on the
|
|
* PowerPC, we can just do these as direct assignments. (Of course, the
|
|
* exception handling means that it's no longer "just"...)
|
|
*/
|
|
#define get_user(x, ptr) \
|
|
__get_user_check((x), (ptr), sizeof(*(ptr)))
|
|
#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)))
|
|
|
|
extern long __put_user_bad(void);
|
|
|
|
#define __put_user_nocheck(x, ptr, size) \
|
|
({ \
|
|
long __pu_err; \
|
|
__put_user_size((x), (ptr), (size), __pu_err); \
|
|
__pu_err; \
|
|
})
|
|
|
|
#define __put_user_check(x, ptr, size) \
|
|
({ \
|
|
long __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, "l.sb"); break; \
|
|
case 2: __put_user_asm(x, ptr, retval, "l.sh"); break; \
|
|
case 4: __put_user_asm(x, ptr, retval, "l.sw"); break; \
|
|
case 8: __put_user_asm2(x, ptr, retval); break; \
|
|
default: __put_user_bad(); \
|
|
} \
|
|
} while (0)
|
|
|
|
struct __large_struct {
|
|
unsigned long buf[100];
|
|
};
|
|
#define __m(x) (*(struct __large_struct *)(x))
|
|
|
|
/*
|
|
* We don't tell gcc that we are accessing memory, but this is OK
|
|
* because we do not write to any memory gcc knows about, so there
|
|
* are no aliasing issues.
|
|
*/
|
|
#define __put_user_asm(x, addr, err, op) \
|
|
__asm__ __volatile__( \
|
|
"1: "op" 0(%2),%1\n" \
|
|
"2:\n" \
|
|
".section .fixup,\"ax\"\n" \
|
|
"3: l.addi %0,r0,%3\n" \
|
|
" l.j 2b\n" \
|
|
" l.nop\n" \
|
|
".previous\n" \
|
|
".section __ex_table,\"a\"\n" \
|
|
" .align 2\n" \
|
|
" .long 1b,3b\n" \
|
|
".previous" \
|
|
: "=r"(err) \
|
|
: "r"(x), "r"(addr), "i"(-EFAULT), "0"(err))
|
|
|
|
#define __put_user_asm2(x, addr, err) \
|
|
__asm__ __volatile__( \
|
|
"1: l.sw 0(%2),%1\n" \
|
|
"2: l.sw 4(%2),%H1\n" \
|
|
"3:\n" \
|
|
".section .fixup,\"ax\"\n" \
|
|
"4: l.addi %0,r0,%3\n" \
|
|
" l.j 3b\n" \
|
|
" l.nop\n" \
|
|
".previous\n" \
|
|
".section __ex_table,\"a\"\n" \
|
|
" .align 2\n" \
|
|
" .long 1b,4b\n" \
|
|
" .long 2b,4b\n" \
|
|
".previous" \
|
|
: "=r"(err) \
|
|
: "r"(x), "r"(addr), "i"(-EFAULT), "0"(err))
|
|
|
|
#define __get_user_nocheck(x, ptr, size) \
|
|
({ \
|
|
long __gu_err, __gu_val; \
|
|
__get_user_size(__gu_val, (ptr), (size), __gu_err); \
|
|
(x) = (__force __typeof__(*(ptr)))__gu_val; \
|
|
__gu_err; \
|
|
})
|
|
|
|
#define __get_user_check(x, ptr, size) \
|
|
({ \
|
|
long __gu_err = -EFAULT, __gu_val = 0; \
|
|
const __typeof__(*(ptr)) * __gu_addr = (ptr); \
|
|
if (access_ok(VERIFY_READ, __gu_addr, size)) \
|
|
__get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
|
|
(x) = (__force __typeof__(*(ptr)))__gu_val; \
|
|
__gu_err; \
|
|
})
|
|
|
|
extern long __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, "l.lbz"); break; \
|
|
case 2: __get_user_asm(x, ptr, retval, "l.lhz"); break; \
|
|
case 4: __get_user_asm(x, ptr, retval, "l.lwz"); break; \
|
|
case 8: __get_user_asm2(x, ptr, retval); break; \
|
|
default: (x) = __get_user_bad(); \
|
|
} \
|
|
} while (0)
|
|
|
|
#define __get_user_asm(x, addr, err, op) \
|
|
__asm__ __volatile__( \
|
|
"1: "op" %1,0(%2)\n" \
|
|
"2:\n" \
|
|
".section .fixup,\"ax\"\n" \
|
|
"3: l.addi %0,r0,%3\n" \
|
|
" l.addi %1,r0,0\n" \
|
|
" l.j 2b\n" \
|
|
" l.nop\n" \
|
|
".previous\n" \
|
|
".section __ex_table,\"a\"\n" \
|
|
" .align 2\n" \
|
|
" .long 1b,3b\n" \
|
|
".previous" \
|
|
: "=r"(err), "=r"(x) \
|
|
: "r"(addr), "i"(-EFAULT), "0"(err))
|
|
|
|
#define __get_user_asm2(x, addr, err) \
|
|
__asm__ __volatile__( \
|
|
"1: l.lwz %1,0(%2)\n" \
|
|
"2: l.lwz %H1,4(%2)\n" \
|
|
"3:\n" \
|
|
".section .fixup,\"ax\"\n" \
|
|
"4: l.addi %0,r0,%3\n" \
|
|
" l.addi %1,r0,0\n" \
|
|
" l.addi %H1,r0,0\n" \
|
|
" l.j 3b\n" \
|
|
" l.nop\n" \
|
|
".previous\n" \
|
|
".section __ex_table,\"a\"\n" \
|
|
" .align 2\n" \
|
|
" .long 1b,4b\n" \
|
|
" .long 2b,4b\n" \
|
|
".previous" \
|
|
: "=r"(err), "=&r"(x) \
|
|
: "r"(addr), "i"(-EFAULT), "0"(err))
|
|
|
|
/* more complex routines */
|
|
|
|
extern unsigned long __must_check
|
|
__copy_tofrom_user(void *to, const void *from, unsigned long size);
|
|
static inline unsigned long
|
|
raw_copy_from_user(void *to, const void __user *from, unsigned long size)
|
|
{
|
|
return __copy_tofrom_user(to, (__force const void *)from, size);
|
|
}
|
|
static inline unsigned long
|
|
raw_copy_to_user(void *to, const void __user *from, unsigned long size)
|
|
{
|
|
return __copy_tofrom_user((__force void *)to, from, size);
|
|
}
|
|
#define INLINE_COPY_FROM_USER
|
|
#define INLINE_COPY_TO_USER
|
|
|
|
extern unsigned long __clear_user(void *addr, unsigned long size);
|
|
|
|
static inline __must_check unsigned long
|
|
clear_user(void *addr, unsigned long size)
|
|
{
|
|
if (likely(access_ok(VERIFY_WRITE, addr, size)))
|
|
size = __clear_user(addr, size);
|
|
return size;
|
|
}
|
|
|
|
#define user_addr_max() \
|
|
(uaccess_kernel() ? ~0UL : TASK_SIZE)
|
|
|
|
extern long strncpy_from_user(char *dest, const char __user *src, long count);
|
|
|
|
extern __must_check long strnlen_user(const char __user *str, long n);
|
|
|
|
#endif /* __ASM_OPENRISC_UACCESS_H */
|
|
|