mirror of
https://github.com/brain-hackers/u-boot-brain
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208 lines
5.5 KiB
C
208 lines
5.5 KiB
C
/*
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* U-boot - uaccess.h
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*
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* Copyright (c) 2005 blackfin.uclinux.org
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*
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* This file is based on
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* Based on: include/asm-m68knommu/uaccess.h
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* Changes made by Lineo Inc. May 2001
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#ifndef __BLACKFIN_UACCESS_H
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#define __BLACKFIN_UACCESS_H
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/*
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* User space memory access functions
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*/
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#include <asm/segment.h>
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#include <asm/errno.h>
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#define VERIFY_READ 0
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#define VERIFY_WRITE 1
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/* We let the MMU do all checking */
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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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return ((unsigned long) addr < 0x10f00000); /* need final decision - Tony */
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}
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static inline int verify_area(int type, const void *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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unsigned long insn, fixup;
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};
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/* Returns 0 if exception not found and fixup otherwise. */
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extern unsigned long search_exception_table(unsigned long);
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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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#define put_user(x, ptr) \
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({ \
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int __pu_err = 0; \
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typeof(*(ptr)) __pu_val = (x); \
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switch (sizeof (*(ptr))) { \
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case 1: \
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__put_user_asm(__pu_err, __pu_val, ptr, B); \
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break; \
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case 2: \
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__put_user_asm(__pu_err, __pu_val, ptr, W); \
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break; \
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case 4: \
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__put_user_asm(__pu_err, __pu_val, ptr, ); \
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break; \
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default: \
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__pu_err = __put_user_bad(); \
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break; \
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} \
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__pu_err; \
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})
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/*
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* [pregs] = dregs ==> 32bits
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* H[pregs] = dregs ==> 16bits
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* B[pregs] = dregs ==> 8 bits
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*/
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#define __put_user(x, ptr) put_user(x, ptr)
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static inline int bad_user_access_length(void)
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{
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panic("bad_user_access_length");
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return -1;
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}
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#define __put_user_bad() (bad_user_access_length(), (-EFAULT))
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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 __ptr(x) ((unsigned long *)(x))
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#define __put_user_asm(err,x,ptr,bhw) \
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__asm__ (#bhw"[%1] = %0;\n\t" \
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: /* no outputs */ \
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:"d" (x),"a" (__ptr(ptr)) : "memory")
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#define get_user(x, ptr) \
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({ \
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int __gu_err = 0; \
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typeof(*(ptr)) __gu_val = 0; \
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switch (sizeof(*(ptr))) { \
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case 1: \
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__get_user_asm(__gu_err, __gu_val, ptr, B, "=d",(Z)); \
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break; \
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case 2: \
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__get_user_asm(__gu_err, __gu_val, ptr, W, "=r",(Z)); \
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break; \
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case 4: \
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__get_user_asm(__gu_err, __gu_val, ptr, , "=r",); \
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break; \
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default: \
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__gu_val = 0; \
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__gu_err = __get_user_bad(); \
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break; \
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} \
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(x) = __gu_val; \
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__gu_err; \
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})
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/* dregs = [pregs] ==> 32bits
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* H[pregs] ==> 16bits
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* B[pregs] ==> 8 bits
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*/
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#define __get_user(x, ptr) get_user(x, ptr)
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#define __get_user_bad() (bad_user_access_length(), (-EFAULT))
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#define __get_user_asm(err,x,ptr,bhw,reg,option) \
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__asm__ ("%0 =" #bhw "[%1]"#option";\n\t" \
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: "=d" (x) \
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: "a" (__ptr(ptr)))
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#define copy_from_user(to, from, n) (memcpy(to, from, n), 0)
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#define copy_to_user(to, from, n) (memcpy(to, from, n), 0)
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#define __copy_from_user(to, from, n) copy_from_user(to, from, n)
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#define __copy_to_user(to, from, n) copy_to_user(to, from, n)
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#define copy_to_user_ret(to,from,n,retval) ({ if (copy_to_user(to,from,n)) return retval; })
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#define copy_from_user_ret(to,from,n,retval) ({ if (copy_from_user(to,from,n)) return retval; })
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/*
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* Copy a null terminated string from userspace.
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*/
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static inline long strncpy_from_user(char *dst, const char *src,
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long count)
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{
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char *tmp;
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strncpy(dst, src, count);
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for (tmp = dst; *tmp && count > 0; tmp++, count--);
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return (tmp - dst); /* DAVIDM should we count a NUL ? check getname */
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}
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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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* Return 0 on exception, a value greater than N if too long
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*/
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static inline long strnlen_user(const char *src, long n)
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{
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return (strlen(src) + 1); /* DAVIDM make safer */
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}
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#define strlen_user(str) strnlen_user(str, 32767)
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/*
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* Zero Userspace
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*/
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static inline unsigned long clear_user(void *to, unsigned long n)
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{
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memset(to, 0, n);
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return (0);
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}
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#endif
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