+++ /dev/null
-/*
- * arch/ubicom32/include/asm/uaccess.h
- * User space memory access functions for Ubicom32 architecture.
- *
- * (C) Copyright 2009, Ubicom, Inc.
- *
- * This file is part of the Ubicom32 Linux Kernel Port.
- *
- * The Ubicom32 Linux Kernel Port 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.
- *
- * The Ubicom32 Linux Kernel Port is distributed in the hope that it
- * will be useful, but WITHOUT ANY WARRANTY; without even the implied
- * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
- * the GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with the Ubicom32 Linux Kernel Port. If not,
- * see <http://www.gnu.org/licenses/>.
- *
- * Ubicom32 implementation derived from (with many thanks):
- * arch/m68knommu
- * arch/blackfin
- * arch/parisc
- * arch/alpha
- */
-#ifndef _ASM_UBICOM32_UACCESS_H
-#define _ASM_UBICOM32_UACCESS_H
-
-/*
- * User space memory access functions
- */
-#include <linux/sched.h>
-#include <linux/mm.h>
-#include <linux/string.h>
-
-#include <asm/segment.h>
-
-#define VERIFY_READ 0
-#define VERIFY_WRITE 1
-
-/*
- * The exception table consists of pairs of addresses: the first is the
- * address of an instruction that is allowed to fault, and the second is
- * the address at which the program should continue. No registers are
- * modified, so it is entirely up to the continuation code to figure out
- * what to do.
- *
- * All the routines below use bits of fixup code that are out of line
- * with the main instruction path. This means when everything is well,
- * we don't even have to jump over them. Further, they do not intrude
- * on our cache or tlb entries.
- */
-struct exception_table_entry
-{
- unsigned long insn, fixup;
-};
-
-/*
- * Ubicom32 does not currently support the exception table handling.
- */
-extern unsigned long search_exception_table(unsigned long);
-
-
-#if defined(CONFIG_ACCESS_OK_CHECKS_ENABLED)
-extern int __access_ok(unsigned long addr, unsigned long size);
-#else
-static inline int __access_ok(unsigned long addr, unsigned long size)
-{
- return 1;
-}
-#endif
-#define access_ok(type, addr, size) \
- likely(__access_ok((unsigned long)(addr), (size)))
-
-/*
- * The following functions do not exist. They keep callers
- * of put_user and get_user from passing unsupported argument
- * types. They result in a link time error.
- */
-extern int __put_user_bad(void);
-extern int __get_user_bad(void);
-
-/*
- * __put_user_no_check()
- * Put the requested data into the user space verifying the address
- *
- * Careful to not
- * (a) re-use the arguments for side effects (sizeof/typeof is ok)
- * (b) require any knowledge of processes at this stage
- */
-#define __put_user_no_check(x, ptr, size) \
-({ \
- int __pu_err = 0; \
- __typeof__(*(ptr)) __user *__pu_addr = (ptr); \
- switch (size) { \
- case 1: \
- case 2: \
- case 4: \
- case 8: \
- *__pu_addr = (__typeof__(*(ptr)))x; \
- break; \
- default: \
- __pu_err = __put_user_bad(); \
- break; \
- } \
- __pu_err; \
-})
-
-/*
- * __put_user_check()
- * Put the requested data into the user space verifying the address
- *
- * Careful to not
- * (a) re-use the arguments for side effects (sizeof/typeof is ok)
- * (b) require any knowledge of processes at this stage
- *
- * If requested, access_ok() will verify that ptr is a valid user
- * pointer.
- */
-#define __put_user_check(x, ptr, size) \
-({ \
- int __pu_err = -EFAULT; \
- __typeof__(*(ptr)) __user *__pu_addr = (ptr); \
- if (access_ok(VERIFY_WRITE, __pu_addr, size)) { \
- __pu_err = 0; \
- switch (size) { \
- case 1: \
- case 2: \
- case 4: \
- case 8: \
- *__pu_addr = (__typeof__(*(ptr)))x; \
- break; \
- default: \
- __pu_err = __put_user_bad(); \
- break; \
- } \
- } \
- __pu_err; \
-})
-
-/*
- * __get_user_no_check()
- * Read the value at ptr into x.
- *
- * If requested, access_ok() will verify that ptr is a valid user
- * pointer. If the caller passes a modifying argument for ptr (e.g. x++)
- * this macro will not work.
- */
-#define __get_user_no_check(x, ptr, size) \
-({ \
- int __gu_err = 0; \
- __typeof__((x)) __gu_val = 0; \
- const __typeof__(*(ptr)) __user *__gu_addr = (ptr); \
- switch (size) { \
- case 1: \
- case 2: \
- case 4: \
- case 8: \
- __gu_val = (__typeof__((x)))*(__gu_addr); \
- break; \
- default: \
- __gu_err = __get_user_bad(); \
- (x) = 0; \
- break; \
- } \
- (x) = __gu_val; \
- __gu_err; \
-})
-
-/*
- * __get_user_check()
- * Read the value at ptr into x.
- *
- * If requested, access_ok() will verify that ptr is a valid user
- * pointer.
- */
-#define __get_user_check(x, ptr, size) \
-({ \
- int __gu_err = -EFAULT; \
- __typeof__(x) __gu_val = 0; \
- const __typeof__(*(ptr)) __user *__gu_addr = (ptr); \
- if (access_ok(VERIFY_READ, __gu_addr, size)) { \
- __gu_err = 0; \
- switch (size) { \
- case 1: \
- case 2: \
- case 4: \
- case 8: \
- __gu_val = (__typeof__((x)))*(__gu_addr); \
- break; \
- default: \
- __gu_err = __get_user_bad(); \
- (x) = 0; \
- break; \
- } \
- } \
- (x) = __gu_val; \
- __gu_err; \
-})
-
-/*
- * The "xxx" versions are allowed to perform some amount of address
- * space checking. See access_ok().
- */
-#define put_user(x,ptr) \
- __put_user_check((__typeof__(*(ptr)))(x),(ptr), sizeof(*(ptr)))
-#define get_user(x,ptr) \
- __get_user_check((x), (ptr), sizeof(*(ptr)))
-
-/*
- * The "__xxx" versions do not do address space checking, useful when
- * doing multiple accesses to the same area (the programmer has to do the
- * checks by hand with "access_ok()")
- */
-#define __put_user(x,ptr) \
- __put_user_no_check((__typeof__(*(ptr)))(x),(ptr), sizeof(*(ptr)))
-#define __get_user(x,ptr) \
- __get_user_no_check((x), (ptr), sizeof(*(ptr)))
-
-/*
- * __copy_tofrom_user_no_check()
- * Copy the data either to or from user space.
- *
- * Return the number of bytes NOT copied.
- */
-static inline unsigned long
-__copy_tofrom_user_no_check(void *to, const void *from, unsigned long n)
-{
- memcpy(to, from, n);
- return 0;
-}
-
-/*
- * copy_to_user()
- * Copy the kernel data to user space.
- *
- * Return the number of bytes that were copied.
- */
-static inline unsigned long
-copy_to_user(void __user *to, const void *from, unsigned long n)
-{
- if (!access_ok(VERIFY_WRITE, to, n)) {
- return n;
- }
- return __copy_tofrom_user_no_check((__force void *)to, from, n);
-}
-
-/*
- * copy_from_user()
- * Copy the user data to kernel space.
- *
- * Return the number of bytes that were copied. On error, we zero
- * out the destination.
- */
-static inline unsigned long
-copy_from_user(void *to, const void __user *from, unsigned long n)
-{
- if (!access_ok(VERIFY_READ, from, n)) {
- return n;
- }
- return __copy_tofrom_user_no_check(to, (__force void *)from, n);
-}
-
-#define __copy_to_user(to, from, n) \
- __copy_tofrom_user_no_check((__force void *)to, from, n)
-#define __copy_from_user(to, from, n) \
- __copy_tofrom_user_no_check(to, (__force void *)from, n)
-#define __copy_to_user_inatomic(to, from, n) \
- __copy_tofrom_user_no_check((__force void *)to, from, n)
-#define __copy_from_user_inatomic(to, from, n) \
- __copy_tofrom_user_no_check(to, (__force void *)from, n)
-
-#define copy_to_user_ret(to, from, n, retval) \
- ({ if (copy_to_user(to, from, n)) return retval; })
-
-#define copy_from_user_ret(to, from, n, retval) \
- ({ if (copy_from_user(to, from, n)) return retval; })
-
-/*
- * strncpy_from_user()
- * Copy a null terminated string from userspace.
- *
- * dst - Destination in kernel space. The buffer must be at least count.
- * src - Address of string in user space.
- * count - Maximum number of bytes to copy (including the trailing NULL).
- *
- * Returns the length of the string (not including the trailing NULL. If
- * count is smaller than the length of the string, we copy count bytes
- * and return count.
- *
- */
-static inline long strncpy_from_user(char *dst, const __user char *src, long count)
-{
- char *tmp;
- if (!access_ok(VERIFY_READ, src, 1)) {
- return -EFAULT;
- }
-
- strncpy(dst, src, count);
- for (tmp = dst; *tmp && count > 0; tmp++, count--) {
- ;
- }
- return(tmp - dst);
-}
-
-/*
- * strnlen_user()
- * Return the size of a string (including the ending 0)
- *
- * Return -EFAULT on exception, a value greater than <n> if too long
- */
-static inline long strnlen_user(const __user char *src, long n)
-{
- if (!access_ok(VERIFY_READ, src, 1)) {
- return -EFAULT;
- }
- return(strlen(src) + 1);
-}
-
-#define strlen_user(str) strnlen_user(str, 32767)
-
-/*
- * __clear_user()
- * Zero Userspace
- */
-static inline unsigned long __clear_user(__user void *to, unsigned long n)
-{
- memset(to, 0, n);
- return 0;
-}
-
-/*
- * clear_user()
- * Zero user space (check for valid addresses)
- */
-static inline unsigned long clear_user(__user void *to, unsigned long n)
-{
- if (!access_ok(VERIFY_WRITE, to, n)) {
- return -EFAULT;
- }
- return __clear_user(to, n);
-}
-
-#endif /* _ASM_UBICOM32_UACCESS_H */
projects / openwrt / svn-archive / archive.git / blobdiff