sh: migrate to arch/sh/include/
This follows the sparc changes a439fe51a1.
Most of the moving about was done with Sam's directions at:
http://marc.info/?l=linux-sh&m=121724823706062&w=2
with subsequent hacking and fixups entirely my fault.
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt
256
arch/sh/include/asm/uaccess.h
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256
arch/sh/include/asm/uaccess.h
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#ifndef __ASM_SH_UACCESS_H
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#define __ASM_SH_UACCESS_H
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <asm/segment.h>
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#define VERIFY_READ 0
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#define VERIFY_WRITE 1
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#define __addr_ok(addr) \
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((unsigned long __force)(addr) < current_thread_info()->addr_limit.seg)
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/*
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* __access_ok: Check if address with size is OK or not.
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*
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* Uhhuh, this needs 33-bit arithmetic. We have a carry..
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*
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* sum := addr + size; carry? --> flag = true;
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* if (sum >= addr_limit) flag = true;
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*/
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#define __access_ok(addr, size) \
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(__addr_ok((addr) + (size)))
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#define access_ok(type, addr, size) \
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(__chk_user_ptr(addr), \
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__access_ok((unsigned long __force)(addr), (size)))
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/*
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* Uh, these should become the main single-value transfer routines ...
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* They automatically use the right size if we just have the right
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* pointer type ...
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*
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* As SuperH uses the same address space for kernel and user data, we
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* can just do these as direct assignments.
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*
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* Careful to not
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* (a) re-use the arguments for side effects (sizeof is ok)
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* (b) require any knowledge of processes at this stage
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*/
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#define put_user(x,ptr) __put_user_check((x), (ptr), sizeof(*(ptr)))
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#define get_user(x,ptr) __get_user_check((x), (ptr), sizeof(*(ptr)))
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/*
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* The "__xxx" versions do not do address space checking, useful when
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* doing multiple accesses to the same area (the user has to do the
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* checks by hand with "access_ok()")
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*/
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#define __put_user(x,ptr) __put_user_nocheck((x), (ptr), sizeof(*(ptr)))
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#define __get_user(x,ptr) __get_user_nocheck((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 __user *)(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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unsigned long __gu_val; \
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const __typeof__(*(ptr)) __user *__gu_addr = (ptr); \
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__chk_user_ptr(ptr); \
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__get_user_size(__gu_val, __gu_addr, (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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#define __get_user_check(x,ptr,size) \
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({ \
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long __gu_err = -EFAULT; \
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unsigned long __gu_val = 0; \
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const __typeof__(*(ptr)) *__gu_addr = (ptr); \
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if (likely(access_ok(VERIFY_READ, __gu_addr, (size)))) \
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__get_user_size(__gu_val, __gu_addr, (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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#define __put_user_nocheck(x,ptr,size) \
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({ \
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long __pu_err; \
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__typeof__(*(ptr)) __user *__pu_addr = (ptr); \
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__chk_user_ptr(ptr); \
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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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#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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if (likely(access_ok(VERIFY_WRITE, __pu_addr, size))) \
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__put_user_size((x), __pu_addr, (size), \
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__pu_err); \
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__pu_err; \
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})
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#ifdef CONFIG_SUPERH32
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# include "uaccess_32.h"
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#else
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# include "uaccess_64.h"
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#endif
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/* Generic arbitrary sized copy. */
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/* Return the number of bytes NOT copied */
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__kernel_size_t __copy_user(void *to, const void *from, __kernel_size_t n);
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static __always_inline unsigned long
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__copy_from_user(void *to, const void __user *from, unsigned long n)
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{
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return __copy_user(to, (__force void *)from, n);
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}
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static __always_inline unsigned long __must_check
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__copy_to_user(void __user *to, const void *from, unsigned long n)
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{
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return __copy_user((__force void *)to, from, n);
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}
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#define __copy_to_user_inatomic __copy_to_user
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#define __copy_from_user_inatomic __copy_from_user
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/*
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* Clear the area and return remaining number of bytes
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* (on failure. Usually it's 0.)
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*/
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__kernel_size_t __clear_user(void *addr, __kernel_size_t size);
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#define clear_user(addr,n) \
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({ \
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void __user * __cl_addr = (addr); \
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unsigned long __cl_size = (n); \
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\
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if (__cl_size && access_ok(VERIFY_WRITE, \
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((unsigned long)(__cl_addr)), __cl_size)) \
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__cl_size = __clear_user(__cl_addr, __cl_size); \
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\
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__cl_size; \
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})
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/**
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* strncpy_from_user: - Copy a NUL terminated string from userspace.
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* @dst: Destination address, in kernel space. This buffer must be at
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* least @count bytes long.
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* @src: Source address, in user space.
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* @count: Maximum number of bytes to copy, including the trailing NUL.
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*
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* Copies a NUL-terminated string from userspace to kernel space.
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*
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* On success, returns the length of the string (not including the trailing
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* NUL).
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*
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* If access to userspace fails, returns -EFAULT (some data may have been
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* copied).
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*
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* If @count is smaller than the length of the string, copies @count bytes
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* and returns @count.
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*/
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#define strncpy_from_user(dest,src,count) \
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({ \
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unsigned long __sfu_src = (unsigned long)(src); \
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int __sfu_count = (int)(count); \
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long __sfu_res = -EFAULT; \
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\
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if (__access_ok(__sfu_src, __sfu_count)) \
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__sfu_res = __strncpy_from_user((unsigned long)(dest), \
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__sfu_src, __sfu_count); \
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\
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__sfu_res; \
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})
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static inline unsigned long
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copy_from_user(void *to, const void __user *from, unsigned long n)
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{
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unsigned long __copy_from = (unsigned long) from;
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__kernel_size_t __copy_size = (__kernel_size_t) n;
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if (__copy_size && __access_ok(__copy_from, __copy_size))
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return __copy_user(to, from, __copy_size);
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return __copy_size;
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}
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static inline unsigned long
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copy_to_user(void __user *to, const void *from, unsigned long n)
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{
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unsigned long __copy_to = (unsigned long) to;
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__kernel_size_t __copy_size = (__kernel_size_t) n;
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if (__copy_size && __access_ok(__copy_to, __copy_size))
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return __copy_user(to, from, __copy_size);
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return __copy_size;
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}
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/**
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* strnlen_user: - Get the size of a string in user space.
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* @s: The string to measure.
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* @n: The maximum valid length
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*
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* Context: User context only. This function may sleep.
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*
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* Get the size of a NUL-terminated string in user space.
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*
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* Returns the size of the string INCLUDING the terminating NUL.
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* On exception, returns 0.
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* If the string is too long, returns a value greater than @n.
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*/
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static inline long strnlen_user(const char __user *s, long n)
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{
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if (!__addr_ok(s))
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return 0;
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else
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return __strnlen_user(s, n);
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}
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/**
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* strlen_user: - Get the size of a string in user space.
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* @str: The string to measure.
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*
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* Context: User context only. This function may sleep.
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*
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* Get the size of a NUL-terminated string in user space.
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*
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* Returns the size of the string INCLUDING the terminating NUL.
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* On exception, returns 0.
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*
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* If there is a limit on the length of a valid string, you may wish to
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* consider using strnlen_user() instead.
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*/
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#define strlen_user(str) strnlen_user(str, ~0UL >> 1)
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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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unsigned long insn, fixup;
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};
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#if defined(CONFIG_SUPERH64) && defined(CONFIG_MMU)
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#define ARCH_HAS_SEARCH_EXTABLE
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#endif
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int fixup_exception(struct pt_regs *regs);
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/* Returns 0 if exception not found and fixup.unit otherwise. */
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unsigned long search_exception_table(unsigned long addr);
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const struct exception_table_entry *search_exception_tables(unsigned long addr);
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#endif /* __ASM_SH_UACCESS_H */
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