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1275 |
phoenix |
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1996, 1997, 1998, 1999, 2000, 03 by Ralf Baechle
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* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
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*/
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#ifndef _ASM_UACCESS_H
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#define _ASM_UACCESS_H
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#include <linux/compiler.h>
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#include <linux/errno.h>
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#include <linux/sched.h>
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#define STR(x) __STR(x)
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#define __STR(x) #x
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/*
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* The fs value determines whether argument validity checking should be
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* performed or not. If get_fs() == USER_DS, checking is performed, with
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* get_fs() == KERNEL_DS, checking is bypassed.
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*
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* For historical reasons, these macros are grossly misnamed.
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*/
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#define KERNEL_DS ((mm_segment_t) { 0UL })
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#define USER_DS ((mm_segment_t) { -TASK_SIZE })
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#define VERIFY_READ 0
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#define VERIFY_WRITE 1
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#define get_fs() (current->thread.current_ds)
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#define get_ds() (KERNEL_DS)
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#define set_fs(x) (current->thread.current_ds=(x))
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#define segment_eq(a,b) ((a).seg == (b).seg)
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/*
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* Is a address valid? This does a straighforward calculation rather
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* than tests.
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*
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* Address valid if:
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* - "addr" doesn't have any high-bits set
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* - AND "size" doesn't have any high-bits set
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* - AND "addr+size" doesn't have any high-bits set
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* - OR we are in kernel mode.
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*/
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#define __ua_size(size) \
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((__builtin_constant_p(size) && (size)) > 0 ? 0 : (size))
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#define __access_ok(addr, size, mask) \
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(((mask) & ((addr) | ((addr) + (size)) | __ua_size(size))) == 0)
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#define __access_mask get_fs().seg
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/*
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* access_ok: - Checks if a user space pointer is valid
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* @type: Type of access: %VERIFY_READ or %VERIFY_WRITE. Note that
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* %VERIFY_WRITE is a superset of %VERIFY_READ - if it is safe
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* to write to a block, it is always safe to read from it.
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* @addr: User space pointer to start of block to check
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* @size: Size of block to check
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*
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* Context: User context only. This function may sleep.
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*
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* Checks if a pointer to a block of memory in user space is valid.
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*
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* Returns true (nonzero) if the memory block may be valid, false (zero)
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* if it is definitely invalid.
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*
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* Note that, depending on architecture, this function probably just
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* checks that the pointer is in the user space range - after calling
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* this function, memory access functions may still return -EFAULT.
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*/
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#define access_ok(type, addr, size) \
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likely(__access_ok((unsigned long)(addr), (size), __access_mask))
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/*
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* verify_area: - Obsolete, use access_ok()
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* @type: Type of access: %VERIFY_READ or %VERIFY_WRITE
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* @addr: User space pointer to start of block to check
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* @size: Size of block to check
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*
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* Context: User context only. This function may sleep.
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*
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* This function has been replaced by access_ok().
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*
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* Checks if a pointer to a block of memory in user space is valid.
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*
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* Returns zero if the memory block may be valid, -EFAULT
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* if it is definitely invalid.
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*
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* See access_ok() for more details.
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*/
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static inline int verify_area(int type, const void * addr, unsigned long size)
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{
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return access_ok(type, addr, size) ? 0 : -EFAULT;
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}
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/*
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* put_user: - Write a simple value into user space.
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* @x: Value to copy to user space.
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* @ptr: Destination address, in user space.
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*
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* Context: User context only. This function may sleep.
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*
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* This macro copies a single simple value from kernel space to user
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* space. It supports simple types like char and int, but not larger
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* data types like structures or arrays.
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*
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* @ptr must have pointer-to-simple-variable type, and @x must be assignable
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* to the result of dereferencing @ptr.
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*
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* Returns zero on success, or -EFAULT on error.
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*/
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#define put_user(x,ptr) \
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__put_user_check((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr)))
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/*
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* get_user: - Get a simple variable from user space.
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* @x: Variable to store result.
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* @ptr: Source address, in user space.
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*
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* Context: User context only. This function may sleep.
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*
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* This macro copies a single simple variable from user space to kernel
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* space. It supports simple types like char and int, but not larger
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* data types like structures or arrays.
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*
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* @ptr must have pointer-to-simple-variable type, and the result of
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* dereferencing @ptr must be assignable to @x without a cast.
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*
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* Returns zero on success, or -EFAULT on error.
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* On error, the variable @x is set to zero.
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*/
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#define get_user(x,ptr) \
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__get_user_check((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr)))
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/*
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* __put_user: - Write a simple value into user space, with less checking.
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* @x: Value to copy to user space.
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* @ptr: Destination address, in user space.
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*
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* Context: User context only. This function may sleep.
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*
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* This macro copies a single simple value from kernel space to user
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* space. It supports simple types like char and int, but not larger
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* data types like structures or arrays.
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*
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* @ptr must have pointer-to-simple-variable type, and @x must be assignable
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* to the result of dereferencing @ptr.
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*
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* Caller must check the pointer with access_ok() before calling this
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* function.
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*
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* Returns zero on success, or -EFAULT on error.
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*/
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#define __put_user(x,ptr) \
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__put_user_nocheck((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr)))
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/*
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* __get_user: - Get a simple variable from user space, with less checking.
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* @x: Variable to store result.
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* @ptr: Source address, in user space.
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*
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* Context: User context only. This function may sleep.
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*
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* This macro copies a single simple variable from user space to kernel
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* space. It supports simple types like char and int, but not larger
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* data types like structures or arrays.
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*
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* @ptr must have pointer-to-simple-variable type, and the result of
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* dereferencing @ptr must be assignable to @x without a cast.
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*
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* Caller must check the pointer with access_ok() before calling this
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* function.
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*
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* Returns zero on success, or -EFAULT on error.
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* On error, the variable @x is set to zero.
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*/
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#define __get_user(x,ptr) \
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__get_user_nocheck((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr)))
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struct __large_struct { unsigned long buf[100]; };
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#define __m(x) (*(struct __large_struct *)(x))
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#define __get_user_nocheck(x,ptr,size) \
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({ \
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long __gu_err; \
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__typeof(*(ptr)) __gu_val; \
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long __gu_addr; \
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__asm__("":"=r" (__gu_val)); \
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__gu_addr = (long) (ptr); \
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__asm__("":"=r" (__gu_err)); \
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switch (size) { \
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case 1: __get_user_asm("lb"); break; \
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case 2: __get_user_asm("lh"); break; \
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case 4: __get_user_asm("lw"); break; \
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case 8: __get_user_asm("ld"); break; \
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default: __get_user_unknown(); break; \
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} x = (__typeof__(*(ptr))) __gu_val; \
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__gu_err; \
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})
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#define __get_user_check(x,ptr,size) \
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({ \
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long __gu_err; \
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__typeof__(*(ptr)) __gu_val; \
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long __gu_addr; \
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__asm__("":"=r" (__gu_val)); \
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__gu_addr = (long) (ptr); \
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__asm__("":"=r" (__gu_err)); \
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if (access_ok(VERIFY_READ, __gu_addr, size)) { \
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switch (size) { \
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case 1: __get_user_asm("lb"); break; \
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case 2: __get_user_asm("lh"); break; \
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case 4: __get_user_asm("lw"); break; \
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case 8: __get_user_asm("ld"); break; \
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default: __get_user_unknown(); break; \
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} \
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} x = (__typeof__(*(ptr))) __gu_val; \
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__gu_err; \
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})
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#define __get_user_asm(insn) \
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({ \
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__asm__ __volatile__( \
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"1:\t" insn "\t%1,%2\n\t" \
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"move\t%0,$0\n" \
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"2:\n\t" \
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".section\t.fixup,\"ax\"\n" \
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"3:\tli\t%0,%3\n\t" \
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"move\t%1,$0\n\t" \
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"j\t2b\n\t" \
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".previous\n\t" \
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".section\t__ex_table,\"a\"\n\t" \
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".dword\t1b,3b\n\t" \
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".previous" \
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:"=r" (__gu_err), "=r" (__gu_val) \
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:"o" (__m(__gu_addr)), "i" (-EFAULT)); \
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})
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| 244 |
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extern void __get_user_unknown(void);
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#define __put_user_nocheck(x,ptr,size) \
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({ \
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long __pu_err; \
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__typeof__(*(ptr)) __pu_val; \
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long __pu_addr; \
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__pu_val = (x); \
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__pu_addr = (long) (ptr); \
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__asm__("":"=r" (__pu_err)); \
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switch (size) { \
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case 1: __put_user_asm("sb"); break; \
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case 2: __put_user_asm("sh"); break; \
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case 4: __put_user_asm("sw"); break; \
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case 8: __put_user_asm("sd"); break; \
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default: __put_user_unknown(); break; \
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} \
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__pu_err; \
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})
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| 263 |
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| 264 |
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#define __put_user_check(x,ptr,size) \
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({ \
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| 266 |
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long __pu_err; \
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__typeof__(*(ptr)) __pu_val; \
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long __pu_addr; \
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| 269 |
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__pu_val = (x); \
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__pu_addr = (long) (ptr); \
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| 271 |
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__asm__("":"=r" (__pu_err)); \
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if (access_ok(VERIFY_WRITE, __pu_addr, size)) { \
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switch (size) { \
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| 274 |
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case 1: __put_user_asm("sb"); break; \
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| 275 |
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case 2: __put_user_asm("sh"); break; \
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| 276 |
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case 4: __put_user_asm("sw"); break; \
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| 277 |
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case 8: __put_user_asm("sd"); break; \
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| 278 |
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default: __put_user_unknown(); break; \
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| 279 |
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} \
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| 280 |
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} \
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| 281 |
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__pu_err; \
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| 282 |
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})
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| 283 |
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| 284 |
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#define __put_user_asm(insn) \
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| 285 |
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({ \
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| 286 |
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__asm__ __volatile__( \
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| 287 |
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"1:\t" insn "\t%z1, %2\t\t\t# __put_user_asm\n\t" \
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| 288 |
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"move\t%0, $0\n" \
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| 289 |
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"2:\n\t" \
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| 290 |
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".section\t.fixup,\"ax\"\n" \
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| 291 |
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"3:\tli\t%0, %3\n\t" \
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| 292 |
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"j\t2b\n\t" \
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| 293 |
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".previous\n\t" \
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| 294 |
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".section\t__ex_table,\"a\"\n\t" \
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| 295 |
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".dword\t1b, 3b\n\t" \
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| 296 |
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".previous" \
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| 297 |
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:"=r" (__pu_err) \
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| 298 |
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:"Jr" (__pu_val), "o" (__m(__pu_addr)), "i" (-EFAULT)); \
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| 299 |
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})
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| 300 |
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|
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| 301 |
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extern void __put_user_unknown(void);
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| 302 |
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|
| 303 |
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/*
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| 304 |
|
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* We're generating jump to subroutines which will be outside the range of
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| 305 |
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* jump instructions
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| 306 |
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*/
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| 307 |
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#ifdef MODULE
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| 308 |
|
|
#define __MODULE_JAL(destination) \
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| 309 |
|
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".set\tnoat\n\t" \
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| 310 |
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"dla\t$1, " #destination "\n\t" \
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| 311 |
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"jalr\t$1\n\t" \
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| 312 |
|
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".set\tat\n\t"
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| 313 |
|
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#else
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| 314 |
|
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#define __MODULE_JAL(destination) \
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| 315 |
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"jal\t" #destination "\n\t"
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| 316 |
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#endif
|
| 317 |
|
|
|
| 318 |
|
|
extern size_t __copy_user(void *__to, const void *__from, size_t __n);
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| 319 |
|
|
|
| 320 |
|
|
#define __invoke_copy_to_user(to,from,n) \
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| 321 |
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({ \
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| 322 |
|
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register void *__cu_to_r __asm__ ("$4"); \
|
| 323 |
|
|
register const void *__cu_from_r __asm__ ("$5"); \
|
| 324 |
|
|
register long __cu_len_r __asm__ ("$6"); \
|
| 325 |
|
|
\
|
| 326 |
|
|
__cu_to_r = (to); \
|
| 327 |
|
|
__cu_from_r = (from); \
|
| 328 |
|
|
__cu_len_r = (n); \
|
| 329 |
|
|
__asm__ __volatile__( \
|
| 330 |
|
|
__MODULE_JAL(__copy_user) \
|
| 331 |
|
|
: "+r" (__cu_to_r), "+r" (__cu_from_r), "+r" (__cu_len_r) \
|
| 332 |
|
|
: \
|
| 333 |
|
|
: "$8", "$9", "$10", "$11", "$12", "$15", "$24", "$31", \
|
| 334 |
|
|
"memory"); \
|
| 335 |
|
|
__cu_len_r; \
|
| 336 |
|
|
})
|
| 337 |
|
|
|
| 338 |
|
|
/*
|
| 339 |
|
|
* __copy_to_user: - Copy a block of data into user space, with less checking.
|
| 340 |
|
|
* @to: Destination address, in user space.
|
| 341 |
|
|
* @from: Source address, in kernel space.
|
| 342 |
|
|
* @n: Number of bytes to copy.
|
| 343 |
|
|
*
|
| 344 |
|
|
* Context: User context only. This function may sleep.
|
| 345 |
|
|
*
|
| 346 |
|
|
* Copy data from kernel space to user space. Caller must check
|
| 347 |
|
|
* the specified block with access_ok() before calling this function.
|
| 348 |
|
|
*
|
| 349 |
|
|
* Returns number of bytes that could not be copied.
|
| 350 |
|
|
* On success, this will be zero.
|
| 351 |
|
|
*/
|
| 352 |
|
|
#define __copy_to_user(to,from,n) \
|
| 353 |
|
|
({ \
|
| 354 |
|
|
void *__cu_to; \
|
| 355 |
|
|
const void *__cu_from; \
|
| 356 |
|
|
long __cu_len; \
|
| 357 |
|
|
\
|
| 358 |
|
|
__cu_to = (to); \
|
| 359 |
|
|
__cu_from = (from); \
|
| 360 |
|
|
__cu_len = (n); \
|
| 361 |
|
|
__cu_len = __invoke_copy_to_user(__cu_to, __cu_from, __cu_len); \
|
| 362 |
|
|
__cu_len; \
|
| 363 |
|
|
})
|
| 364 |
|
|
|
| 365 |
|
|
/*
|
| 366 |
|
|
* copy_to_user: - Copy a block of data into user space.
|
| 367 |
|
|
* @to: Destination address, in user space.
|
| 368 |
|
|
* @from: Source address, in kernel space.
|
| 369 |
|
|
* @n: Number of bytes to copy.
|
| 370 |
|
|
*
|
| 371 |
|
|
* Context: User context only. This function may sleep.
|
| 372 |
|
|
*
|
| 373 |
|
|
* Copy data from kernel space to user space.
|
| 374 |
|
|
*
|
| 375 |
|
|
* Returns number of bytes that could not be copied.
|
| 376 |
|
|
* On success, this will be zero.
|
| 377 |
|
|
*/
|
| 378 |
|
|
#define copy_to_user(to,from,n) \
|
| 379 |
|
|
({ \
|
| 380 |
|
|
void *__cu_to; \
|
| 381 |
|
|
const void *__cu_from; \
|
| 382 |
|
|
long __cu_len; \
|
| 383 |
|
|
\
|
| 384 |
|
|
__cu_to = (to); \
|
| 385 |
|
|
__cu_from = (from); \
|
| 386 |
|
|
__cu_len = (n); \
|
| 387 |
|
|
if (access_ok(VERIFY_WRITE, __cu_to, __cu_len)) \
|
| 388 |
|
|
__cu_len = __invoke_copy_to_user(__cu_to, __cu_from, \
|
| 389 |
|
|
__cu_len); \
|
| 390 |
|
|
__cu_len; \
|
| 391 |
|
|
})
|
| 392 |
|
|
|
| 393 |
|
|
#define __invoke_copy_from_user(to,from,n) \
|
| 394 |
|
|
({ \
|
| 395 |
|
|
register void *__cu_to_r __asm__ ("$4"); \
|
| 396 |
|
|
register const void *__cu_from_r __asm__ ("$5"); \
|
| 397 |
|
|
register long __cu_len_r __asm__ ("$6"); \
|
| 398 |
|
|
\
|
| 399 |
|
|
__cu_to_r = (to); \
|
| 400 |
|
|
__cu_from_r = (from); \
|
| 401 |
|
|
__cu_len_r = (n); \
|
| 402 |
|
|
__asm__ __volatile__( \
|
| 403 |
|
|
".set\tnoreorder\n\t" \
|
| 404 |
|
|
__MODULE_JAL(__copy_user) \
|
| 405 |
|
|
".set\tnoat\n\t" \
|
| 406 |
|
|
"daddu\t$1, %1, %2\n\t" \
|
| 407 |
|
|
".set\tat\n\t" \
|
| 408 |
|
|
".set\treorder\n\t" \
|
| 409 |
|
|
"move\t%0, $6" \
|
| 410 |
|
|
: "+r" (__cu_to_r), "+r" (__cu_from_r), "+r" (__cu_len_r) \
|
| 411 |
|
|
: \
|
| 412 |
|
|
: "$8", "$9", "$10", "$11", "$12", "$15", "$24", "$31", \
|
| 413 |
|
|
"memory"); \
|
| 414 |
|
|
__cu_len_r; \
|
| 415 |
|
|
})
|
| 416 |
|
|
|
| 417 |
|
|
/*
|
| 418 |
|
|
* __copy_from_user: - Copy a block of data from user space, with less checking. * @to: Destination address, in kernel space.
|
| 419 |
|
|
* @from: Source address, in user space.
|
| 420 |
|
|
* @n: Number of bytes to copy.
|
| 421 |
|
|
*
|
| 422 |
|
|
* Context: User context only. This function may sleep.
|
| 423 |
|
|
*
|
| 424 |
|
|
* Copy data from user space to kernel space. Caller must check
|
| 425 |
|
|
* the specified block with access_ok() before calling this function.
|
| 426 |
|
|
*
|
| 427 |
|
|
* Returns number of bytes that could not be copied.
|
| 428 |
|
|
* On success, this will be zero.
|
| 429 |
|
|
*
|
| 430 |
|
|
* If some data could not be copied, this function will pad the copied
|
| 431 |
|
|
* data to the requested size using zero bytes.
|
| 432 |
|
|
*/
|
| 433 |
|
|
#define __copy_from_user(to,from,n) \
|
| 434 |
|
|
({ \
|
| 435 |
|
|
void *__cu_to; \
|
| 436 |
|
|
const void *__cu_from; \
|
| 437 |
|
|
long __cu_len; \
|
| 438 |
|
|
\
|
| 439 |
|
|
__cu_to = (to); \
|
| 440 |
|
|
__cu_from = (from); \
|
| 441 |
|
|
__cu_len = (n); \
|
| 442 |
|
|
__cu_len = __invoke_copy_from_user(__cu_to, __cu_from, \
|
| 443 |
|
|
__cu_len); \
|
| 444 |
|
|
__cu_len; \
|
| 445 |
|
|
})
|
| 446 |
|
|
|
| 447 |
|
|
/*
|
| 448 |
|
|
* copy_from_user: - Copy a block of data from user space.
|
| 449 |
|
|
* @to: Destination address, in kernel space.
|
| 450 |
|
|
* @from: Source address, in user space.
|
| 451 |
|
|
* @n: Number of bytes to copy.
|
| 452 |
|
|
*
|
| 453 |
|
|
* Context: User context only. This function may sleep.
|
| 454 |
|
|
*
|
| 455 |
|
|
* Copy data from user space to kernel space.
|
| 456 |
|
|
*
|
| 457 |
|
|
* Returns number of bytes that could not be copied.
|
| 458 |
|
|
* On success, this will be zero.
|
| 459 |
|
|
*
|
| 460 |
|
|
* If some data could not be copied, this function will pad the copied
|
| 461 |
|
|
* data to the requested size using zero bytes.
|
| 462 |
|
|
*/
|
| 463 |
|
|
#define copy_from_user(to,from,n) \
|
| 464 |
|
|
({ \
|
| 465 |
|
|
void *__cu_to; \
|
| 466 |
|
|
const void *__cu_from; \
|
| 467 |
|
|
long __cu_len; \
|
| 468 |
|
|
\
|
| 469 |
|
|
__cu_to = (to); \
|
| 470 |
|
|
__cu_from = (from); \
|
| 471 |
|
|
__cu_len = (n); \
|
| 472 |
|
|
if (access_ok(VERIFY_READ, __cu_from, __cu_len)) \
|
| 473 |
|
|
__cu_len = __invoke_copy_from_user(__cu_to, __cu_from, \
|
| 474 |
|
|
__cu_len); \
|
| 475 |
|
|
__cu_len; \
|
| 476 |
|
|
})
|
| 477 |
|
|
|
| 478 |
|
|
/*
|
| 479 |
|
|
* __clear_user: - Zero a block of memory in user space, with less checking.
|
| 480 |
|
|
* @to: Destination address, in user space.
|
| 481 |
|
|
* @n: Number of bytes to zero.
|
| 482 |
|
|
*
|
| 483 |
|
|
* Zero a block of memory in user space. Caller must check
|
| 484 |
|
|
* the specified block with access_ok() before calling this function.
|
| 485 |
|
|
*
|
| 486 |
|
|
* Returns number of bytes that could not be cleared.
|
| 487 |
|
|
* On success, this will be zero.
|
| 488 |
|
|
*/
|
| 489 |
|
|
static inline __kernel_size_t
|
| 490 |
|
|
__clear_user(void *addr, __kernel_size_t size)
|
| 491 |
|
|
{
|
| 492 |
|
|
__kernel_size_t res;
|
| 493 |
|
|
|
| 494 |
|
|
__asm__ __volatile__(
|
| 495 |
|
|
"move\t$4, %1\n\t"
|
| 496 |
|
|
"move\t$5, $0\n\t"
|
| 497 |
|
|
"move\t$6, %2\n\t"
|
| 498 |
|
|
__MODULE_JAL(__bzero)
|
| 499 |
|
|
"move\t%0, $6"
|
| 500 |
|
|
: "=r" (res)
|
| 501 |
|
|
: "r" (addr), "r" (size)
|
| 502 |
|
|
: "$4", "$5", "$6", "$8", "$9", "$31");
|
| 503 |
|
|
|
| 504 |
|
|
return res;
|
| 505 |
|
|
}
|
| 506 |
|
|
|
| 507 |
|
|
#define clear_user(addr,n) \
|
| 508 |
|
|
({ \
|
| 509 |
|
|
void * __cl_addr = (addr); \
|
| 510 |
|
|
unsigned long __cl_size = (n); \
|
| 511 |
|
|
if (__cl_size && access_ok(VERIFY_WRITE, \
|
| 512 |
|
|
((unsigned long)(__cl_addr)), __cl_size)) \
|
| 513 |
|
|
__cl_size = __clear_user(__cl_addr, __cl_size); \
|
| 514 |
|
|
__cl_size; \
|
| 515 |
|
|
})
|
| 516 |
|
|
|
| 517 |
|
|
/*
|
| 518 |
|
|
* __strncpy_from_user: - Copy a NUL terminated string from userspace, with less checking.
|
| 519 |
|
|
* @dst: Destination address, in kernel space. This buffer must be at
|
| 520 |
|
|
* least @count bytes long.
|
| 521 |
|
|
* @src: Source address, in user space.
|
| 522 |
|
|
* @count: Maximum number of bytes to copy, including the trailing NUL.
|
| 523 |
|
|
*
|
| 524 |
|
|
* Copies a NUL-terminated string from userspace to kernel space.
|
| 525 |
|
|
* Caller must check the specified block with access_ok() before calling
|
| 526 |
|
|
* this function.
|
| 527 |
|
|
*
|
| 528 |
|
|
* On success, returns the length of the string (not including the trailing
|
| 529 |
|
|
* NUL).
|
| 530 |
|
|
*
|
| 531 |
|
|
* If access to userspace fails, returns -EFAULT (some data may have been
|
| 532 |
|
|
* copied).
|
| 533 |
|
|
*
|
| 534 |
|
|
* If @count is smaller than the length of the string, copies @count bytes
|
| 535 |
|
|
* and returns @count.
|
| 536 |
|
|
*/
|
| 537 |
|
|
static inline long
|
| 538 |
|
|
__strncpy_from_user(char *__to, const char *__from, long __len)
|
| 539 |
|
|
{
|
| 540 |
|
|
long res;
|
| 541 |
|
|
|
| 542 |
|
|
__asm__ __volatile__(
|
| 543 |
|
|
"move\t$4, %1\n\t"
|
| 544 |
|
|
"move\t$5, %2\n\t"
|
| 545 |
|
|
"move\t$6, %3\n\t"
|
| 546 |
|
|
__MODULE_JAL(__strncpy_from_user_nocheck_asm)
|
| 547 |
|
|
"move\t%0, $2"
|
| 548 |
|
|
: "=r" (res)
|
| 549 |
|
|
: "r" (__to), "r" (__from), "r" (__len)
|
| 550 |
|
|
: "$2", "$3", "$4", "$5", "$6", "$8", "$31", "memory");
|
| 551 |
|
|
|
| 552 |
|
|
return res;
|
| 553 |
|
|
}
|
| 554 |
|
|
|
| 555 |
|
|
/*
|
| 556 |
|
|
* strncpy_from_user: - Copy a NUL terminated string from userspace.
|
| 557 |
|
|
* @dst: Destination address, in kernel space. This buffer must be at
|
| 558 |
|
|
* least @count bytes long.
|
| 559 |
|
|
* @src: Source address, in user space.
|
| 560 |
|
|
* @count: Maximum number of bytes to copy, including the trailing NUL.
|
| 561 |
|
|
*
|
| 562 |
|
|
* Copies a NUL-terminated string from userspace to kernel space.
|
| 563 |
|
|
*
|
| 564 |
|
|
* On success, returns the length of the string (not including the trailing
|
| 565 |
|
|
* NUL).
|
| 566 |
|
|
*
|
| 567 |
|
|
* If access to userspace fails, returns -EFAULT (some data may have been
|
| 568 |
|
|
* copied).
|
| 569 |
|
|
*
|
| 570 |
|
|
* If @count is smaller than the length of the string, copies @count bytes
|
| 571 |
|
|
* and returns @count.
|
| 572 |
|
|
*/
|
| 573 |
|
|
static inline long
|
| 574 |
|
|
strncpy_from_user(char *__to, const char *__from, long __len)
|
| 575 |
|
|
{
|
| 576 |
|
|
long res;
|
| 577 |
|
|
|
| 578 |
|
|
__asm__ __volatile__(
|
| 579 |
|
|
"move\t$4, %1\n\t"
|
| 580 |
|
|
"move\t$5, %2\n\t"
|
| 581 |
|
|
"move\t$6, %3\n\t"
|
| 582 |
|
|
__MODULE_JAL(__strncpy_from_user_asm)
|
| 583 |
|
|
"move\t%0, $2"
|
| 584 |
|
|
: "=r" (res)
|
| 585 |
|
|
: "r" (__to), "r" (__from), "r" (__len)
|
| 586 |
|
|
: "$2", "$3", "$4", "$5", "$6", "$8", "$31", "memory");
|
| 587 |
|
|
|
| 588 |
|
|
return res;
|
| 589 |
|
|
}
|
| 590 |
|
|
|
| 591 |
|
|
/* Returns: 0 if bad, string length+1 (memory size) of string if ok */
|
| 592 |
|
|
static inline long __strlen_user(const char *s)
|
| 593 |
|
|
{
|
| 594 |
|
|
long res;
|
| 595 |
|
|
|
| 596 |
|
|
__asm__ __volatile__(
|
| 597 |
|
|
"move\t$4, %1\n\t"
|
| 598 |
|
|
__MODULE_JAL(__strlen_user_nocheck_asm)
|
| 599 |
|
|
"move\t%0, $2"
|
| 600 |
|
|
: "=r" (res)
|
| 601 |
|
|
: "r" (s)
|
| 602 |
|
|
: "$2", "$4", "$8", "$31");
|
| 603 |
|
|
|
| 604 |
|
|
return res;
|
| 605 |
|
|
}
|
| 606 |
|
|
|
| 607 |
|
|
/*
|
| 608 |
|
|
* strlen_user: - Get the size of a string in user space.
|
| 609 |
|
|
* @str: The string to measure.
|
| 610 |
|
|
*
|
| 611 |
|
|
* Context: User context only. This function may sleep.
|
| 612 |
|
|
*
|
| 613 |
|
|
* Get the size of a NUL-terminated string in user space.
|
| 614 |
|
|
*
|
| 615 |
|
|
* Returns the size of the string INCLUDING the terminating NUL.
|
| 616 |
|
|
* On exception, returns 0.
|
| 617 |
|
|
*
|
| 618 |
|
|
* If there is a limit on the length of a valid string, you may wish to
|
| 619 |
|
|
* consider using strnlen_user() instead.
|
| 620 |
|
|
*/
|
| 621 |
|
|
static inline long strlen_user(const char *s)
|
| 622 |
|
|
{
|
| 623 |
|
|
long res;
|
| 624 |
|
|
|
| 625 |
|
|
__asm__ __volatile__(
|
| 626 |
|
|
"move\t$4, %1\n\t"
|
| 627 |
|
|
__MODULE_JAL(__strlen_user_asm)
|
| 628 |
|
|
"move\t%0, $2"
|
| 629 |
|
|
: "=r" (res)
|
| 630 |
|
|
: "r" (s)
|
| 631 |
|
|
: "$2", "$4", "$8", "$31");
|
| 632 |
|
|
|
| 633 |
|
|
return res;
|
| 634 |
|
|
}
|
| 635 |
|
|
|
| 636 |
|
|
/*
|
| 637 |
|
|
* strlen_user: - Get the size of a string in user space.
|
| 638 |
|
|
* @str: The string to measure.
|
| 639 |
|
|
* @n: The maximum valid length
|
| 640 |
|
|
*
|
| 641 |
|
|
* Get the size of a NUL-terminated string in user space.
|
| 642 |
|
|
*
|
| 643 |
|
|
* Returns the size of the string INCLUDING the terminating NUL.
|
| 644 |
|
|
* On exception, returns 0.
|
| 645 |
|
|
* If the string is too long, returns a value greater than @n.
|
| 646 |
|
|
*/
|
| 647 |
|
|
static inline long strnlen_user(const char *s, long n)
|
| 648 |
|
|
{
|
| 649 |
|
|
long res;
|
| 650 |
|
|
|
| 651 |
|
|
__asm__ __volatile__(
|
| 652 |
|
|
"move\t$4, %1\n\t"
|
| 653 |
|
|
"move\t$5, %2\n\t"
|
| 654 |
|
|
__MODULE_JAL(__strnlen_user_asm)
|
| 655 |
|
|
"move\t%0, $2"
|
| 656 |
|
|
: "=r" (res)
|
| 657 |
|
|
: "r" (s), "r" (n)
|
| 658 |
|
|
: "$2", "$4", "$5", "$8", "$31");
|
| 659 |
|
|
|
| 660 |
|
|
return res;
|
| 661 |
|
|
}
|
| 662 |
|
|
|
| 663 |
|
|
struct exception_table_entry
|
| 664 |
|
|
{
|
| 665 |
|
|
unsigned long insn;
|
| 666 |
|
|
unsigned long nextinsn;
|
| 667 |
|
|
};
|
| 668 |
|
|
|
| 669 |
|
|
/* Returns 0 if exception not found and fixup.unit otherwise. */
|
| 670 |
|
|
extern unsigned long search_exception_table(unsigned long addr);
|
| 671 |
|
|
|
| 672 |
|
|
/* Returns the new pc */
|
| 673 |
|
|
#define fixup_exception(map_reg, fixup_unit, pc) \
|
| 674 |
|
|
({ \
|
| 675 |
|
|
fixup_unit; \
|
| 676 |
|
|
})
|
| 677 |
|
|
|
| 678 |
|
|
#endif /* _ASM_UACCESS_H */
|
