+++ /dev/null
-/* uaccess.h: userspace accessor functions
- *
- * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
-
-#ifndef _ASM_UACCESS_H
-#define _ASM_UACCESS_H
-
-/*
- * User space memory access functions
- */
-#include <linux/mm.h>
-#include <asm/segment.h>
-#include <asm/sections.h>
-#include <asm/extable.h>
-
-#define __ptr(x) ((unsigned long __force *)(x))
-
-/*
- * check that a range of addresses falls within the current address limit
- */
-static inline int ___range_ok(unsigned long addr, unsigned long size)
-{
-#ifdef CONFIG_MMU
- int flag = -EFAULT, tmp;
-
- asm volatile (
- " addcc %3,%2,%1,icc0 \n" /* set C-flag if addr+size>4GB */
- " subcc.p %1,%4,gr0,icc1 \n" /* jump if addr+size>limit */
- " bc icc0,#0,0f \n"
- " bhi icc1,#0,0f \n"
- " setlos #0,%0 \n" /* mark okay */
- "0: \n"
- : "=r"(flag), "=&r"(tmp)
- : "r"(addr), "r"(size), "r"(get_addr_limit()), "0"(flag)
- );
-
- return flag;
-
-#else
-
- if (addr < memory_start ||
- addr > memory_end ||
- size > memory_end - memory_start ||
- addr + size > memory_end)
- return -EFAULT;
-
- return 0;
-#endif
-}
-
-#define __range_ok(addr,size) ___range_ok((unsigned long) (addr), (unsigned long) (size))
-
-#define access_ok(type,addr,size) (__range_ok((void __user *)(addr), (size)) == 0)
-#define __access_ok(addr,size) (__range_ok((addr), (size)) == 0)
-
-
-/*
- * These are the main single-value transfer routines. They automatically
- * use the right size if we just have the right pointer type.
- */
-#define __put_user(x, ptr) \
-({ \
- int __pu_err = 0; \
- \
- typeof(*(ptr)) __pu_val = (x); \
- __chk_user_ptr(ptr); \
- \
- switch (sizeof (*(ptr))) { \
- case 1: \
- __put_user_asm(__pu_err, __pu_val, ptr, "b", "r"); \
- break; \
- case 2: \
- __put_user_asm(__pu_err, __pu_val, ptr, "h", "r"); \
- break; \
- case 4: \
- __put_user_asm(__pu_err, __pu_val, ptr, "", "r"); \
- break; \
- case 8: \
- __put_user_asm(__pu_err, __pu_val, ptr, "d", "e"); \
- break; \
- default: \
- __pu_err = __put_user_bad(); \
- break; \
- } \
- __pu_err; \
-})
-
-#define put_user(x, ptr) \
-({ \
- typeof(*(ptr)) __user *_p = (ptr); \
- int _e; \
- \
- _e = __range_ok(_p, sizeof(*_p)); \
- if (_e == 0) \
- _e = __put_user((x), _p); \
- _e; \
-})
-
-extern int __put_user_bad(void);
-
-/*
- * Tell gcc we read from memory instead of writing: this is because
- * we do not write to any memory gcc knows about, so there are no
- * aliasing issues.
- */
-
-#ifdef CONFIG_MMU
-
-#define __put_user_asm(err,x,ptr,dsize,constraint) \
-do { \
- asm volatile("1: st"dsize"%I1 %2,%M1 \n" \
- "2: \n" \
- ".subsection 2 \n" \
- "3: setlos %3,%0 \n" \
- " bra 2b \n" \
- ".previous \n" \
- ".section __ex_table,\"a\" \n" \
- " .balign 8 \n" \
- " .long 1b,3b \n" \
- ".previous" \
- : "=r" (err) \
- : "m" (*__ptr(ptr)), constraint (x), "i"(-EFAULT), "0"(err) \
- : "memory"); \
-} while (0)
-
-#else
-
-#define __put_user_asm(err,x,ptr,bwl,con) \
-do { \
- asm(" st"bwl"%I0 %1,%M0 \n" \
- " membar \n" \
- : \
- : "m" (*__ptr(ptr)), con (x) \
- : "memory"); \
-} while (0)
-
-#endif
-
-/*****************************************************************************/
-/*
- *
- */
-#define __get_user(x, ptr) \
-({ \
- int __gu_err = 0; \
- __chk_user_ptr(ptr); \
- \
- switch (sizeof(*(ptr))) { \
- case 1: { \
- unsigned char __gu_val; \
- __get_user_asm(__gu_err, __gu_val, ptr, "ub", "=r"); \
- (x) = *(__force __typeof__(*(ptr)) *) &__gu_val; \
- break; \
- } \
- case 2: { \
- unsigned short __gu_val; \
- __get_user_asm(__gu_err, __gu_val, ptr, "uh", "=r"); \
- (x) = *(__force __typeof__(*(ptr)) *) &__gu_val; \
- break; \
- } \
- case 4: { \
- unsigned int __gu_val; \
- __get_user_asm(__gu_err, __gu_val, ptr, "", "=r"); \
- (x) = *(__force __typeof__(*(ptr)) *) &__gu_val; \
- break; \
- } \
- case 8: { \
- unsigned long long __gu_val; \
- __get_user_asm(__gu_err, __gu_val, ptr, "d", "=e"); \
- (x) = *(__force __typeof__(*(ptr)) *) &__gu_val; \
- break; \
- } \
- default: \
- __gu_err = __get_user_bad(); \
- break; \
- } \
- __gu_err; \
-})
-
-#define get_user(x, ptr) \
-({ \
- const typeof(*(ptr)) __user *_p = (ptr);\
- int _e; \
- \
- _e = __range_ok(_p, sizeof(*_p)); \
- if (likely(_e == 0)) \
- _e = __get_user((x), _p); \
- else \
- (x) = (typeof(x)) 0; \
- _e; \
-})
-
-extern int __get_user_bad(void);
-
-#ifdef CONFIG_MMU
-
-#define __get_user_asm(err,x,ptr,dtype,constraint) \
-do { \
- asm("1: ld"dtype"%I2 %M2,%1 \n" \
- "2: \n" \
- ".subsection 2 \n" \
- "3: setlos %3,%0 \n" \
- " setlos #0,%1 \n" \
- " bra 2b \n" \
- ".previous \n" \
- ".section __ex_table,\"a\" \n" \
- " .balign 8 \n" \
- " .long 1b,3b \n" \
- ".previous" \
- : "=r" (err), constraint (x) \
- : "m" (*__ptr(ptr)), "i"(-EFAULT), "0"(err) \
- ); \
-} while(0)
-
-#else
-
-#define __get_user_asm(err,x,ptr,bwl,con) \
- asm(" ld"bwl"%I1 %M1,%0 \n" \
- " membar \n" \
- : con(x) \
- : "m" (*__ptr(ptr)))
-
-#endif
-
-/*****************************************************************************/
-/*
- *
- */
-
-#define ____force(x) (__force void *)(void __user *)(x)
-#ifdef CONFIG_MMU
-extern long __memset_user(void *dst, unsigned long count);
-extern long __memcpy_user(void *dst, const void *src, unsigned long count);
-
-#define __clear_user(dst,count) __memset_user(____force(dst), (count))
-
-#else
-
-#define __clear_user(dst,count) (memset(____force(dst), 0, (count)), 0)
-
-#endif
-
-static inline unsigned long
-raw_copy_from_user(void *to, const void __user *from, unsigned long n)
-{
-#ifdef CONFIG_MMU
- return __memcpy_user(to, (__force const void *)from, n);
-#else
- memcpy(to, (__force const void *)from, n);
- return 0;
-#endif
-}
-
-static inline unsigned long
-raw_copy_to_user(void __user *to, const void *from, unsigned long n)
-{
-#ifdef CONFIG_MMU
- return __memcpy_user((__force void *)to, from, n);
-#else
- memcpy((__force void *)to, from, n);
- return 0;
-#endif
-}
-#define INLINE_COPY_TO_USER
-#define INLINE_COPY_FROM_USER
-
-static inline unsigned long __must_check
-clear_user(void __user *to, unsigned long n)
-{
- if (likely(__access_ok(to, n)))
- n = __clear_user(to, n);
- return n;
-}
-
-extern long strncpy_from_user(char *dst, const char __user *src, long count);
-extern long strnlen_user(const char __user *src, long count);
-
-#endif /* _ASM_UACCESS_H */
git.samba.org / sfrench / cifs-2.6.git / blobdiff