2660663ff2
Reviewed-by: Ingo Molnar <mingo@elte.hu> Acked-by: Stephen Neuendorffer <stephen.neuendorffer@xilinx.com> Acked-by: John Linn <john.linn@xilinx.com> Acked-by: John Williams <john.williams@petalogix.com> Signed-off-by: Michal Simek <monstr@monstr.eu>
135 lines
3.7 KiB
C
135 lines
3.7 KiB
C
/*
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* Copyright (C) 2006 Atmark Techno, Inc.
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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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#ifndef _ASM_MICROBLAZE_UACCESS_H
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#define _ASM_MICROBLAZE_UACCESS_H
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#ifdef __KERNEL__
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#ifndef __ASSEMBLY__
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/sched.h> /* RLIMIT_FSIZE */
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#include <linux/mm.h>
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#include <asm/mmu.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/segment.h>
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#include <linux/string.h>
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#define VERIFY_READ 0
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#define VERIFY_WRITE 1
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extern int ___range_ok(unsigned long addr, unsigned long size);
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#define __range_ok(addr, size) \
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___range_ok((unsigned long)(addr), (unsigned long)(size))
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#define access_ok(type, addr, size) (__range_ok((addr), (size)) == 0)
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#define __access_ok(add, size) (__range_ok((addr), (size)) == 0)
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extern inline int bad_user_access_length(void)
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{
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return 0;
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}
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/* FIXME this is function for optimalization -> memcpy */
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#define __get_user(var, ptr) \
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({ \
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int __gu_err = 0; \
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switch (sizeof(*(ptr))) { \
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case 1: \
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case 2: \
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case 4: \
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(var) = *(ptr); \
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break; \
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case 8: \
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memcpy((void *) &(var), (ptr), 8); \
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break; \
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default: \
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(var) = 0; \
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__gu_err = __get_user_bad(); \
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break; \
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} \
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__gu_err; \
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})
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#define __get_user_bad() (bad_user_access_length(), (-EFAULT))
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#define __put_user(var, ptr) \
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({ \
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int __pu_err = 0; \
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switch (sizeof(*(ptr))) { \
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case 1: \
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case 2: \
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case 4: \
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*(ptr) = (var); \
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break; \
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case 8: { \
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typeof(*(ptr)) __pu_val = var; \
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memcpy(ptr, &__pu_val, sizeof(__pu_val));\
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} \
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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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#define __put_user_bad() (bad_user_access_length(), (-EFAULT))
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#define put_user(x, ptr) __put_user(x, ptr)
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#define get_user(x, ptr) __get_user(x, ptr)
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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) (memcpy(to, from, n), 0)
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#define __copy_to_user(to, from, n) (copy_to_user(to, from, n))
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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_inatomic(to, from, n) (__copy_to_user(to, from, n))
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#define __copy_from_user_inatomic(to, from, n) (__copy_from_user(to, from, n))
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#define __clear_user(addr, n) (memset((void *)addr, 0, n), 0)
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static inline unsigned long clear_user(void *addr, unsigned long size)
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{
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if (access_ok(VERIFY_WRITE, addr, size))
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size = __clear_user(addr, size);
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return size;
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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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extern long strncpy_from_user(char *dst, const char __user *src, long count);
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extern long strnlen_user(const char __user *src, long count);
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extern long __strncpy_from_user(char *dst, const char __user *src, long count);
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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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#endif /* __ASSEMBLY__ */
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#endif /* __KERNEL__ */
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#endif /* _ASM_MICROBLAZE_UACCESS_H */
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