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305 lines
8.6 KiB
C
305 lines
8.6 KiB
C
#ifndef __ASM_SH64_UACCESS_H
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#define __ASM_SH64_UACCESS_H
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/*
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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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* include/asm-sh64/uaccess.h
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*
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* Copyright (C) 2000, 2001 Paolo Alberelli
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* Copyright (C) 2003, 2004 Paul Mundt
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*
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* User space memory access functions
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*
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* Copyright (C) 1999 Niibe Yutaka
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*
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* Based on:
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* MIPS implementation version 1.15 by
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* Copyright (C) 1996, 1997, 1998 by Ralf Baechle
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* and i386 version.
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*
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*/
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#include <linux/errno.h>
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#include <linux/sched.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 (Data Segment Register?), these macros are misnamed.
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*/
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#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
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#define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFF)
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#define USER_DS MAKE_MM_SEG(0x80000000)
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#define get_ds() (KERNEL_DS)
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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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#define segment_eq(a,b) ((a).seg == (b).seg)
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#define __addr_ok(addr) ((unsigned long)(addr) < (current_thread_info()->addr_limit.seg))
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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 __range_ok(addr,size) (((unsigned long) (addr) + (size) < (current_thread_info()->addr_limit.seg)) ? 0 : 1)
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#define access_ok(type,addr,size) (__range_ok(addr,size) == 0)
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#define __access_ok(addr,size) (__range_ok(addr,size) == 0)
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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 MIPS 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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/*
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* The "xxx_ret" versions return constant specified in third argument, if
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* something bad happens. These macros can be optimized for the
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* case of just returning from the function xxx_ret is used.
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*/
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#define put_user_ret(x,ptr,ret) ({ \
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if (put_user(x,ptr)) return ret; })
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#define get_user_ret(x,ptr,ret) ({ \
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if (get_user(x,ptr)) return ret; })
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#define __put_user_ret(x,ptr,ret) ({ \
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if (__put_user(x,ptr)) return ret; })
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#define __get_user_ret(x,ptr,ret) ({ \
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if (__get_user(x,ptr)) return ret; })
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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_size(x,ptr,size,retval) \
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do { \
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retval = 0; \
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switch (size) { \
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case 1: \
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retval = __get_user_asm_b(x, ptr); \
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break; \
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case 2: \
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retval = __get_user_asm_w(x, ptr); \
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break; \
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case 4: \
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retval = __get_user_asm_l(x, ptr); \
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break; \
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case 8: \
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retval = __get_user_asm_q(x, ptr); \
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break; \
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default: \
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__get_user_unknown(); \
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break; \
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} \
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} while (0)
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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((void *)&__gu_val, (long)(ptr), \
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(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_addr = (long)(ptr); \
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long __gu_err = -EFAULT, __gu_val; \
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if (__access_ok(__gu_addr, (size))) \
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__get_user_size((void *)&__gu_val, __gu_addr, \
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(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_asm_b(void *, long);
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extern long __get_user_asm_w(void *, long);
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extern long __get_user_asm_l(void *, long);
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extern long __get_user_asm_q(void *, long);
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extern void __get_user_unknown(void);
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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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switch (size) { \
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case 1: \
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retval = __put_user_asm_b(x, ptr); \
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break; \
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case 2: \
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retval = __put_user_asm_w(x, ptr); \
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break; \
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case 4: \
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retval = __put_user_asm_l(x, ptr); \
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break; \
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case 8: \
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retval = __put_user_asm_q(x, ptr); \
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break; \
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default: \
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__put_user_unknown(); \
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} \
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} while (0)
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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 = (x); \
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__put_user_size((void *)&__pu_val, (long)(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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long __pu_addr = (long)(ptr); \
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__typeof__(*(ptr)) __pu_val = (x); \
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\
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if (__access_ok(__pu_addr, (size))) \
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__put_user_size((void *)&__pu_val, __pu_addr, (size), __pu_err);\
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__pu_err; \
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})
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extern long __put_user_asm_b(void *, long);
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extern long __put_user_asm_w(void *, long);
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extern long __put_user_asm_l(void *, long);
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extern long __put_user_asm_q(void *, long);
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extern void __put_user_unknown(void);
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/* Generic arbitrary sized copy. */
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/* Return the number of bytes NOT copied */
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/* XXX: should be such that: 4byte and the rest. */
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extern __kernel_size_t __copy_user(void *__to, const void *__from, __kernel_size_t __n);
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#define copy_to_user(to,from,n) ({ \
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void *__copy_to = (void *) (to); \
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__kernel_size_t __copy_size = (__kernel_size_t) (n); \
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__kernel_size_t __copy_res; \
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if(__copy_size && __access_ok((unsigned long)__copy_to, __copy_size)) { \
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__copy_res = __copy_user(__copy_to, (void *) (from), __copy_size); \
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} else __copy_res = __copy_size; \
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__copy_res; })
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#define copy_to_user_ret(to,from,n,retval) ({ \
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if (copy_to_user(to,from,n)) \
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return retval; \
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})
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#define __copy_to_user(to,from,n) \
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__copy_user((void *)(to), \
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(void *)(from), n)
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#define __copy_to_user_ret(to,from,n,retval) ({ \
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if (__copy_to_user(to,from,n)) \
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return retval; \
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})
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#define copy_from_user(to,from,n) ({ \
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void *__copy_to = (void *) (to); \
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void *__copy_from = (void *) (from); \
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__kernel_size_t __copy_size = (__kernel_size_t) (n); \
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__kernel_size_t __copy_res; \
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if(__copy_size && __access_ok((unsigned long)__copy_from, __copy_size)) { \
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__copy_res = __copy_user(__copy_to, __copy_from, __copy_size); \
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} else __copy_res = __copy_size; \
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__copy_res; })
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#define copy_from_user_ret(to,from,n,retval) ({ \
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if (copy_from_user(to,from,n)) \
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return retval; \
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})
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#define __copy_from_user(to,from,n) \
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__copy_user((void *)(to), \
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(void *)(from), n)
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#define __copy_from_user_ret(to,from,n,retval) ({ \
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if (__copy_from_user(to,from,n)) \
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return retval; \
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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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/* XXX: Not sure it works well..
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should be such that: 4byte clear and the rest. */
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extern __kernel_size_t __clear_user(void *addr, __kernel_size_t size);
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#define clear_user(addr,n) ({ \
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void * __cl_addr = (addr); \
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unsigned long __cl_size = (n); \
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if (__cl_size && __access_ok(((unsigned long)(__cl_addr)), __cl_size)) \
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__cl_size = __clear_user(__cl_addr, __cl_size); \
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__cl_size; })
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extern int __strncpy_from_user(unsigned long __dest, unsigned long __src, int __count);
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#define strncpy_from_user(dest,src,count) ({ \
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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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if(__access_ok(__sfu_src, __sfu_count)) { \
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__sfu_res = __strncpy_from_user((unsigned long) (dest), __sfu_src, __sfu_count); \
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} __sfu_res; })
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#define strlen_user(str) strnlen_user(str, ~0UL >> 1)
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/*
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* Return the size of a string (including the ending 0!)
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*/
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extern long __strnlen_user(const char *__s, long __n);
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static inline long strnlen_user(const char *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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struct exception_table_entry
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{
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unsigned long insn, fixup;
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};
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#define ARCH_HAS_SEARCH_EXTABLE
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/* Returns 0 if exception not found and fixup.unit otherwise. */
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extern unsigned long search_exception_table(unsigned long addr);
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extern const struct exception_table_entry *search_exception_tables (unsigned long addr);
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#endif /* __ASM_SH64_UACCESS_H */
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