arch/um/kernel/tt/include/uaccess-tt.h

   1 /*
   2  * Copyright (C) 2000 - 2003 Jeff Dike (jdike@addtoit.com)
   3  * Licensed under the GPL
   4  */
   5
   6 #ifndef __TT_UACCESS_H
   7 #define __TT_UACCESS_H
   8
   9 #include "linux/string.h"
  10 #include "linux/sched.h"
  11 #include "asm/processor.h"
  12 #include "asm/errno.h"
  13 #include "asm/current.h"
  14 #include "asm/a.out.h"
  15 #include "uml_uaccess.h"
  16
  17 #define ABOVE_KMEM (16 * 1024 * 1024)
  18
  19 extern unsigned long end_vm;
  20 extern unsigned long uml_physmem;
  21
  22 #define under_task_size(addr, size) \
  23         (((unsigned long) (addr) < TASK_SIZE) && \
  24          (((unsigned long) (addr) + (size)) < TASK_SIZE))
  25
  26 #define is_stack(addr, size) \
  27         (((unsigned long) (addr) < STACK_TOP) && \
  28          ((unsigned long) (addr) >= STACK_TOP - ABOVE_KMEM) && \
  29          (((unsigned long) (addr) + (size)) <= STACK_TOP))
  30
  31 #define access_ok_tt(type, addr, size) \
  32         ((type == VERIFY_READ) || (segment_eq(get_fs(), KERNEL_DS)) || \
  33          (((unsigned long) (addr) <= ((unsigned long) (addr) + (size))) && \
  34           (under_task_size(addr, size) || is_stack(addr, size))))
  35
  36 static inline int verify_area_tt(int type, const void * addr,
  37                                  unsigned long size)
  38 {
  39         return(access_ok_tt(type, addr, size) ? 0 : -EFAULT);
  40 }
  41
  42 extern unsigned long get_fault_addr(void);
  43
  44 extern int __do_copy_from_user(void *to, const void *from, int n,
  45                                void **fault_addr, void **fault_catcher);
  46 extern int __do_strncpy_from_user(char *dst, const char *src, size_t n,
  47                                   void **fault_addr, void **fault_catcher);
  48 extern int __do_clear_user(void *mem, size_t len, void **fault_addr,
  49                            void **fault_catcher);
  50 extern int __do_strnlen_user(const char *str, unsigned long n,
  51                              void **fault_addr, void **fault_catcher);
  52
  53 extern int copy_from_user_tt(void *to, const void *from, int n);
  54 extern int copy_to_user_tt(void *to, const void *from, int n);
  55 extern int strncpy_from_user_tt(char *dst, const char *src, int count);
  56 extern int __clear_user_tt(void *mem, int len);
  57 extern int clear_user_tt(void *mem, int len);
  58 extern int strnlen_user_tt(const void *str, int len);
  59
  60 #endif
  61
  62 /*
  63  * Overrides for Emacs so that we follow Linus's tabbing style.
  64  * Emacs will notice this stuff at the end of the file and automatically
  65  * adjust the settings for this buffer only.  This must remain at the end
  66  * of the file.
  67  * ---------------------------------------------------------------------------
  68  * Local variables:
  69  * c-file-style: "linux"
  70  * End:
  71  */