forked from Qortal/Brooklyn
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.
278 lines
7.8 KiB
278 lines
7.8 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
|
/* |
|
* 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 <[email protected]> |
|
* Copyright (C) 2010-2011 Jonas Bonn <[email protected]> |
|
* et al. |
|
*/ |
|
|
|
#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 USER_DS (TASK_SIZE) |
|
#define get_fs() (current_thread_info()->addr_limit) |
|
#define set_fs(x) (current_thread_info()->addr_limit = (x)) |
|
|
|
#define uaccess_kernel() (get_fs() == KERNEL_DS) |
|
|
|
/* Ensure that the range from addr to addr+size is all within the process' |
|
* address space |
|
*/ |
|
static inline int __range_ok(unsigned long addr, unsigned long size) |
|
{ |
|
const mm_segment_t fs = get_fs(); |
|
|
|
return size <= fs && addr <= (fs - size); |
|
} |
|
|
|
#define access_ok(addr, size) \ |
|
({ \ |
|
__chk_user_ptr(addr); \ |
|
__range_ok((unsigned long)(addr), (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)) __user *__pu_addr = (ptr); \ |
|
if (access_ok(__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; \ |
|
__get_user_size((x), (ptr), (size), __gu_err); \ |
|
__gu_err; \ |
|
}) |
|
|
|
#define __get_user_check(x, ptr, size) \ |
|
({ \ |
|
long __gu_err = -EFAULT; \ |
|
const __typeof__(*(ptr)) __user *__gu_addr = (ptr); \ |
|
if (access_ok(__gu_addr, size)) \ |
|
__get_user_size((x), __gu_addr, (size), __gu_err); \ |
|
else \ |
|
(x) = (__typeof__(*(ptr))) 0; \ |
|
__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) = (__typeof__(*(ptr)))__get_user_bad(); \ |
|
} \ |
|
} while (0) |
|
|
|
#define __get_user_asm(x, addr, err, op) \ |
|
{ \ |
|
unsigned long __gu_tmp; \ |
|
__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"(__gu_tmp) \ |
|
: "r"(addr), "i"(-EFAULT), "0"(err)); \ |
|
(x) = (__typeof__(*(addr)))__gu_tmp; \ |
|
} |
|
|
|
#define __get_user_asm2(x, addr, err) \ |
|
{ \ |
|
unsigned long long __gu_tmp; \ |
|
__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"(__gu_tmp) \ |
|
: "r"(addr), "i"(-EFAULT), "0"(err)); \ |
|
(x) = (__typeof__(*(addr)))( \ |
|
(__typeof__((x)-(x)))__gu_tmp); \ |
|
} |
|
|
|
/* 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 __user *to, const void *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 __user *addr, unsigned long size); |
|
|
|
static inline __must_check unsigned long |
|
clear_user(void __user *addr, unsigned long size) |
|
{ |
|
if (likely(access_ok(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 */
|
|
|