754 lines
23 KiB
C
754 lines
23 KiB
C
#ifndef _ASM_M32R_UACCESS_H
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#define _ASM_M32R_UACCESS_H
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/*
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* linux/include/asm-m32r/uaccess.h
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*
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* M32R version.
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* Copyright (C) 2004 Hirokazu Takata <takata at linux-m32r.org>
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*/
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#undef UACCESS_DEBUG
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#ifdef UACCESS_DEBUG
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#define UAPRINTK(args...) printk(args)
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#else
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#define UAPRINTK(args...)
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#endif /* UACCESS_DEBUG */
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/*
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* User space memory access functions
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*/
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#include <linux/config.h>
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#include <linux/errno.h>
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#include <linux/thread_info.h>
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#include <asm/page.h>
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#define VERIFY_READ 0
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#define VERIFY_WRITE 1
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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 MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
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#ifdef CONFIG_MMU
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#define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFF)
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#define USER_DS MAKE_MM_SEG(PAGE_OFFSET)
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#else
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#define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFF)
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#define USER_DS MAKE_MM_SEG(0xFFFFFFFF)
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#endif /* CONFIG_MMU */
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#define get_ds() (KERNEL_DS)
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#ifdef CONFIG_MMU
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#define get_fs() (current_thread_info()->addr_limit)
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#define set_fs(x) (current_thread_info()->addr_limit = (x))
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#else
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static inline mm_segment_t get_fs(void)
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{
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return USER_DS;
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}
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static inline void set_fs(mm_segment_t s)
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{
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}
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#endif /* CONFIG_MMU */
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#define segment_eq(a,b) ((a).seg == (b).seg)
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#define __addr_ok(addr) \
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((unsigned long)(addr) < (current_thread_info()->addr_limit.seg))
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/*
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* Test whether a block of memory is a valid user space address.
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* Returns 0 if the range is valid, nonzero otherwise.
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*
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* This is equivalent to the following test:
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* (u33)addr + (u33)size >= (u33)current->addr_limit.seg
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*
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* This needs 33-bit arithmetic. We have a carry...
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*/
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#define __range_ok(addr,size) ({ \
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unsigned long flag, sum; \
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__chk_user_ptr(addr); \
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asm ( \
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" cmpu %1, %1 ; clear cbit\n" \
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" addx %1, %3 ; set cbit if overflow\n" \
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" subx %0, %0\n" \
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" cmpu %4, %1\n" \
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" subx %0, %5\n" \
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: "=&r"(flag), "=r"(sum) \
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: "1"(addr), "r"((int)(size)), \
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"r"(current_thread_info()->addr_limit.seg), "r"(0) \
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: "cbit" ); \
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flag; })
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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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#ifdef CONFIG_MMU
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#define access_ok(type,addr,size) (likely(__range_ok(addr,size) == 0))
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#else
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static inline int access_ok(int type, const void *addr, unsigned long size)
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{
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extern unsigned long memory_start, memory_end;
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unsigned long val = (unsigned long)addr;
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return ((val >= memory_start) && ((val + size) < memory_end));
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}
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#endif /* CONFIG_MMU */
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/**
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* verify_area: - Obsolete/deprecated and will go away soon,
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* use access_ok() instead.
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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 __deprecated verify_area(int type, const void __user *addr,
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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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* The exception table consists of pairs of addresses: the first is the
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* address of an instruction that is allowed to fault, and the second is
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* the address at which the program should continue. No registers are
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* modified, so it is entirely up to the continuation code to figure out
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* what to do.
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*
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* All the routines below use bits of fixup code that are out of line
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* with the main instruction path. This means when everything is well,
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* we don't even have to jump over them. Further, they do not intrude
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* on our cache or tlb entries.
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*/
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struct exception_table_entry
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{
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unsigned long insn, fixup;
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};
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extern int fixup_exception(struct pt_regs *regs);
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/*
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* These are the main single-value transfer routines. They automatically
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* use the right size if we just have the right pointer type.
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*
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* This gets kind of ugly. We want to return _two_ values in "get_user()"
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* and yet we don't want to do any pointers, because that is too much
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* of a performance impact. Thus we have a few rather ugly macros here,
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* and hide all the uglyness from the user.
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*
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* The "__xxx" versions of the user access functions are versions that
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* do not verify the address space, that must have been done previously
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* with a separate "access_ok()" call (this is used when we do multiple
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* accesses to the same area of user memory).
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*/
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extern void __get_user_1(void);
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extern void __get_user_2(void);
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extern void __get_user_4(void);
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#ifndef MODULE
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#define __get_user_x(size,ret,x,ptr) \
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__asm__ __volatile__( \
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" mv r0, %0\n" \
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" mv r1, %1\n" \
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" bl __get_user_" #size "\n" \
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" mv %0, r0\n" \
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" mv %1, r1\n" \
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: "=r"(ret), "=r"(x) \
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: "0"(ptr) \
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: "r0", "r1", "r14" )
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#else /* MODULE */
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/*
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* Use "jl" instead of "bl" for MODULE
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*/
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#define __get_user_x(size,ret,x,ptr) \
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__asm__ __volatile__( \
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" mv r0, %0\n" \
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" mv r1, %1\n" \
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" seth lr, #high(__get_user_" #size ")\n" \
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" or3 lr, lr, #low(__get_user_" #size ")\n" \
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" jl lr\n" \
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" mv %0, r0\n" \
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" mv %1, r1\n" \
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: "=r"(ret), "=r"(x) \
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: "0"(ptr) \
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: "r0", "r1", "r14" )
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#endif
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/* Careful: we have to cast the result to the type of the pointer for sign
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reasons */
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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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({ int __ret_gu,__val_gu; \
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__chk_user_ptr(ptr); \
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switch(sizeof (*(ptr))) { \
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case 1: __get_user_x(1,__ret_gu,__val_gu,ptr); break; \
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case 2: __get_user_x(2,__ret_gu,__val_gu,ptr); break; \
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case 4: __get_user_x(4,__ret_gu,__val_gu,ptr); break; \
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default: __get_user_x(X,__ret_gu,__val_gu,ptr); break; \
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} \
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(x) = (__typeof__(*(ptr)))__val_gu; \
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__ret_gu; \
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})
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extern void __put_user_bad(void);
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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, 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((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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#define __put_user_nocheck(x,ptr,size) \
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({ \
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long __pu_err; \
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__put_user_size((x),(ptr),(size),__pu_err); \
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__pu_err; \
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})
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#define __put_user_check(x,ptr,size) \
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({ \
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long __pu_err = -EFAULT; \
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__typeof__(*(ptr)) __user *__pu_addr = (ptr); \
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might_sleep(); \
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if (access_ok(VERIFY_WRITE,__pu_addr,size)) \
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__put_user_size((x),__pu_addr,(size),__pu_err); \
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__pu_err; \
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})
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#if defined(__LITTLE_ENDIAN__)
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#define __put_user_u64(x, addr, err) \
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__asm__ __volatile__( \
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" .fillinsn\n" \
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"1: st %L1,@%2\n" \
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" .fillinsn\n" \
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"2: st %H1,@(4,%2)\n" \
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" .fillinsn\n" \
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"3:\n" \
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".section .fixup,\"ax\"\n" \
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" .balign 4\n" \
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"4: ldi %0,%3\n" \
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" seth r14,#high(3b)\n" \
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" or3 r14,r14,#low(3b)\n" \
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" jmp r14\n" \
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".previous\n" \
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".section __ex_table,\"a\"\n" \
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" .balign 4\n" \
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" .long 1b,4b\n" \
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" .long 2b,4b\n" \
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".previous" \
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: "=r"(err) \
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: "r"(x), "r"(addr), "i"(-EFAULT), "0"(err) \
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: "r14", "memory")
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#elif defined(__BIG_ENDIAN__)
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#define __put_user_u64(x, addr, err) \
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__asm__ __volatile__( \
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" .fillinsn\n" \
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"1: st %H1,@%2\n" \
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" .fillinsn\n" \
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"2: st %L1,@(4,%2)\n" \
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" .fillinsn\n" \
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"3:\n" \
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".section .fixup,\"ax\"\n" \
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" .balign 4\n" \
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"4: ldi %0,%3\n" \
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" seth r14,#high(3b)\n" \
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" or3 r14,r14,#low(3b)\n" \
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" jmp r14\n" \
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".previous\n" \
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".section __ex_table,\"a\"\n" \
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" .balign 4\n" \
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" .long 1b,4b\n" \
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" .long 2b,4b\n" \
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".previous" \
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: "=r"(err) \
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: "r"(x), "r"(addr), "i"(-EFAULT), "0"(err) \
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: "r14", "memory")
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#else
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#error no endian defined
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#endif
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#define __put_user_size(x,ptr,size,retval) \
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do { \
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retval = 0; \
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__chk_user_ptr(ptr); \
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switch (size) { \
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case 1: __put_user_asm(x,ptr,retval,"b"); break; \
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case 2: __put_user_asm(x,ptr,retval,"h"); break; \
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case 4: __put_user_asm(x,ptr,retval,""); break; \
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case 8: __put_user_u64((__typeof__(*ptr))(x),ptr,retval); break;\
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default: __put_user_bad(); \
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} \
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} while (0)
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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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/*
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* Tell gcc we read from memory instead of writing: this is because
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* we do not write to any memory gcc knows about, so there are no
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* aliasing issues.
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*/
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#define __put_user_asm(x, addr, err, itype) \
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__asm__ __volatile__( \
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" .fillinsn\n" \
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"1: st"itype" %1,@%2\n" \
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" .fillinsn\n" \
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"2:\n" \
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".section .fixup,\"ax\"\n" \
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" .balign 4\n" \
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"3: ldi %0,%3\n" \
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" seth r14,#high(2b)\n" \
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" or3 r14,r14,#low(2b)\n" \
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" jmp r14\n" \
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".previous\n" \
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".section __ex_table,\"a\"\n" \
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" .balign 4\n" \
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" .long 1b,3b\n" \
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".previous" \
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: "=r"(err) \
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: "r"(x), "r"(addr), "i"(-EFAULT), "0"(err) \
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: "r14", "memory")
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#define __get_user_nocheck(x,ptr,size) \
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({ \
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long __gu_err, __gu_val; \
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__get_user_size(__gu_val,(ptr),(size),__gu_err); \
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(x) = (__typeof__(*(ptr)))__gu_val; \
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__gu_err; \
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})
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extern long __get_user_bad(void);
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#define __get_user_size(x,ptr,size,retval) \
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do { \
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retval = 0; \
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__chk_user_ptr(ptr); \
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switch (size) { \
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case 1: __get_user_asm(x,ptr,retval,"ub"); break; \
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case 2: __get_user_asm(x,ptr,retval,"uh"); break; \
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case 4: __get_user_asm(x,ptr,retval,""); break; \
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default: (x) = __get_user_bad(); \
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} \
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} while (0)
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#define __get_user_asm(x, addr, err, itype) \
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__asm__ __volatile__( \
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" .fillinsn\n" \
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"1: ld"itype" %1,@%2\n" \
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" .fillinsn\n" \
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"2:\n" \
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".section .fixup,\"ax\"\n" \
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" .balign 4\n" \
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"3: ldi %0,%3\n" \
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" seth r14,#high(2b)\n" \
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" or3 r14,r14,#low(2b)\n" \
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" jmp r14\n" \
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".previous\n" \
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".section __ex_table,\"a\"\n" \
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" .balign 4\n" \
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" .long 1b,3b\n" \
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".previous" \
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: "=r"(err), "=&r"(x) \
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: "r"(addr), "i"(-EFAULT), "0"(err) \
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: "r14", "memory")
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/*
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* Here we special-case 1, 2 and 4-byte copy_*_user invocations. On a fault
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* we return the initial request size (1, 2 or 4), as copy_*_user should do.
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* If a store crosses a page boundary and gets a fault, the m32r will not write
|
|
* anything, so this is accurate.
|
|
*/
|
|
|
|
|
|
/*
|
|
* Copy To/From Userspace
|
|
*/
|
|
|
|
/* Generic arbitrary sized copy. */
|
|
/* Return the number of bytes NOT copied. */
|
|
#define __copy_user(to,from,size) \
|
|
do { \
|
|
unsigned long __dst, __src, __c; \
|
|
__asm__ __volatile__ ( \
|
|
" mv r14, %0\n" \
|
|
" or r14, %1\n" \
|
|
" beq %0, %1, 9f\n" \
|
|
" beqz %2, 9f\n" \
|
|
" and3 r14, r14, #3\n" \
|
|
" bnez r14, 2f\n" \
|
|
" and3 %2, %2, #3\n" \
|
|
" beqz %3, 2f\n" \
|
|
" addi %0, #-4 ; word_copy \n" \
|
|
" .fillinsn\n" \
|
|
"0: ld r14, @%1+\n" \
|
|
" addi %3, #-1\n" \
|
|
" .fillinsn\n" \
|
|
"1: st r14, @+%0\n" \
|
|
" bnez %3, 0b\n" \
|
|
" beqz %2, 9f\n" \
|
|
" addi %0, #4\n" \
|
|
" .fillinsn\n" \
|
|
"2: ldb r14, @%1 ; byte_copy \n" \
|
|
" .fillinsn\n" \
|
|
"3: stb r14, @%0\n" \
|
|
" addi %1, #1\n" \
|
|
" addi %2, #-1\n" \
|
|
" addi %0, #1\n" \
|
|
" bnez %2, 2b\n" \
|
|
" .fillinsn\n" \
|
|
"9:\n" \
|
|
".section .fixup,\"ax\"\n" \
|
|
" .balign 4\n" \
|
|
"5: addi %3, #1\n" \
|
|
" addi %1, #-4\n" \
|
|
" .fillinsn\n" \
|
|
"6: slli %3, #2\n" \
|
|
" add %2, %3\n" \
|
|
" addi %0, #4\n" \
|
|
" .fillinsn\n" \
|
|
"7: seth r14, #high(9b)\n" \
|
|
" or3 r14, r14, #low(9b)\n" \
|
|
" jmp r14\n" \
|
|
".previous\n" \
|
|
".section __ex_table,\"a\"\n" \
|
|
" .balign 4\n" \
|
|
" .long 0b,6b\n" \
|
|
" .long 1b,5b\n" \
|
|
" .long 2b,9b\n" \
|
|
" .long 3b,9b\n" \
|
|
".previous\n" \
|
|
: "=&r"(__dst), "=&r"(__src), "=&r"(size), "=&r"(__c) \
|
|
: "0"(to), "1"(from), "2"(size), "3"(size / 4) \
|
|
: "r14", "memory"); \
|
|
} while (0)
|
|
|
|
#define __copy_user_zeroing(to,from,size) \
|
|
do { \
|
|
unsigned long __dst, __src, __c; \
|
|
__asm__ __volatile__ ( \
|
|
" mv r14, %0\n" \
|
|
" or r14, %1\n" \
|
|
" beq %0, %1, 9f\n" \
|
|
" beqz %2, 9f\n" \
|
|
" and3 r14, r14, #3\n" \
|
|
" bnez r14, 2f\n" \
|
|
" and3 %2, %2, #3\n" \
|
|
" beqz %3, 2f\n" \
|
|
" addi %0, #-4 ; word_copy \n" \
|
|
" .fillinsn\n" \
|
|
"0: ld r14, @%1+\n" \
|
|
" addi %3, #-1\n" \
|
|
" .fillinsn\n" \
|
|
"1: st r14, @+%0\n" \
|
|
" bnez %3, 0b\n" \
|
|
" beqz %2, 9f\n" \
|
|
" addi %0, #4\n" \
|
|
" .fillinsn\n" \
|
|
"2: ldb r14, @%1 ; byte_copy \n" \
|
|
" .fillinsn\n" \
|
|
"3: stb r14, @%0\n" \
|
|
" addi %1, #1\n" \
|
|
" addi %2, #-1\n" \
|
|
" addi %0, #1\n" \
|
|
" bnez %2, 2b\n" \
|
|
" .fillinsn\n" \
|
|
"9:\n" \
|
|
".section .fixup,\"ax\"\n" \
|
|
" .balign 4\n" \
|
|
"5: addi %3, #1\n" \
|
|
" addi %1, #-4\n" \
|
|
" .fillinsn\n" \
|
|
"6: slli %3, #2\n" \
|
|
" add %2, %3\n" \
|
|
" addi %0, #4\n" \
|
|
" .fillinsn\n" \
|
|
"7: ldi r14, #0 ; store zero \n" \
|
|
" .fillinsn\n" \
|
|
"8: addi %2, #-1\n" \
|
|
" stb r14, @%0 ; ACE? \n" \
|
|
" addi %0, #1\n" \
|
|
" bnez %2, 8b\n" \
|
|
" seth r14, #high(9b)\n" \
|
|
" or3 r14, r14, #low(9b)\n" \
|
|
" jmp r14\n" \
|
|
".previous\n" \
|
|
".section __ex_table,\"a\"\n" \
|
|
" .balign 4\n" \
|
|
" .long 0b,6b\n" \
|
|
" .long 1b,5b\n" \
|
|
" .long 2b,7b\n" \
|
|
" .long 3b,7b\n" \
|
|
".previous\n" \
|
|
: "=&r"(__dst), "=&r"(__src), "=&r"(size), "=&r"(__c) \
|
|
: "0"(to), "1"(from), "2"(size), "3"(size / 4) \
|
|
: "r14", "memory"); \
|
|
} while (0)
|
|
|
|
|
|
/* We let the __ versions of copy_from/to_user inline, because they're often
|
|
* used in fast paths and have only a small space overhead.
|
|
*/
|
|
static inline unsigned long __generic_copy_from_user_nocheck(void *to,
|
|
const void __user *from, unsigned long n)
|
|
{
|
|
__copy_user_zeroing(to,from,n);
|
|
return n;
|
|
}
|
|
|
|
static inline unsigned long __generic_copy_to_user_nocheck(void __user *to,
|
|
const void *from, unsigned long n)
|
|
{
|
|
__copy_user(to,from,n);
|
|
return n;
|
|
}
|
|
|
|
unsigned long __generic_copy_to_user(void *, const void *, unsigned long);
|
|
unsigned long __generic_copy_from_user(void *, const void *, unsigned long);
|
|
|
|
/**
|
|
* __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.
|
|
*/
|
|
#define __copy_to_user(to,from,n) \
|
|
__generic_copy_to_user_nocheck((to),(from),(n))
|
|
|
|
#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.
|
|
*/
|
|
#define copy_to_user(to,from,n) \
|
|
({ \
|
|
might_sleep(); \
|
|
__generic_copy_to_user((to),(from),(n)); \
|
|
})
|
|
|
|
/**
|
|
* __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.
|
|
*/
|
|
#define __copy_from_user(to,from,n) \
|
|
__generic_copy_from_user_nocheck((to),(from),(n))
|
|
|
|
/**
|
|
* 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.
|
|
*/
|
|
#define copy_from_user(to,from,n) \
|
|
({ \
|
|
might_sleep(); \
|
|
__generic_copy_from_user((to),(from),(n)); \
|
|
})
|
|
|
|
long __must_check strncpy_from_user(char *dst, const char __user *src,
|
|
long count);
|
|
long __must_check __strncpy_from_user(char *dst,
|
|
const char __user *src, long count);
|
|
|
|
/**
|
|
* __clear_user: - Zero a block of memory in user space, with less checking.
|
|
* @to: Destination address, in user space.
|
|
* @n: Number of bytes to zero.
|
|
*
|
|
* Zero a block of memory in user space. Caller must check
|
|
* the specified block with access_ok() before calling this function.
|
|
*
|
|
* Returns number of bytes that could not be cleared.
|
|
* On success, this will be zero.
|
|
*/
|
|
unsigned long __clear_user(void __user *mem, unsigned long len);
|
|
|
|
/**
|
|
* clear_user: - Zero a block of memory in user space.
|
|
* @to: Destination address, in user space.
|
|
* @n: Number of bytes to zero.
|
|
*
|
|
* Zero a block of memory in user space. Caller must check
|
|
* the specified block with access_ok() before calling this function.
|
|
*
|
|
* Returns number of bytes that could not be cleared.
|
|
* On success, this will be zero.
|
|
*/
|
|
unsigned long clear_user(void __user *mem, unsigned long len);
|
|
|
|
/**
|
|
* 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 >> 1)
|
|
long strnlen_user(const char __user *str, long n);
|
|
|
|
#endif /* _ASM_M32R_UACCESS_H */
|