arch/um/os-Linux/uaccess.c

   1 /*
   2  * Copyright (C) 2001 Chris Emerson (cemerson@chiark.greenend.org.uk)
   3  * Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
   4  * Licensed under the GPL
   5  */
   6
   7 #include <stddef.h>
   8 #include "longjmp.h"
   9
  10 unsigned long __do_user_copy(void *to, const void *from, int n,
  11                              void **fault_addr, void **fault_catcher,
  12                              void (*op)(void *to, const void *from,
  13                                         int n), int *faulted_out)
  14 {
  15         unsigned long *faddrp = (unsigned long *) fault_addr, ret;
  16
  17         jmp_buf jbuf;
  18         *fault_catcher = &jbuf;
  19         if(UML_SETJMP(&jbuf) == 0){
  20                 (*op)(to, from, n);
  21                 ret = 0;
  22                 *faulted_out = 0;
  23         }
  24         else {
  25                 ret = *faddrp;
  26                 *faulted_out = 1;
  27         }
  28         *fault_addr = NULL;
  29         *fault_catcher = NULL;
  30         return ret;
  31 }
  32