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 <setjmp.h>
   8 #include <string.h>
   9 #include "longjmp.h"
  10
  11 unsigned long __do_user_copy(void *to, const void *from, int n,
  12                              void **fault_addr, void **fault_catcher,
  13                              void (*op)(void *to, const void *from,
  14                                         int n), int *faulted_out)
  15 {
  16         unsigned long *faddrp = (unsigned long *) fault_addr, ret;
  17
  18         jmp_buf jbuf;
  19         *fault_catcher = &jbuf;
  20         if(UML_SETJMP(&jbuf) == 0){
  21                 (*op)(to, from, n);
  22                 ret = 0;
  23                 *faulted_out = 0;
  24         }
  25         else {
  26                 ret = *faddrp;
  27                 *faulted_out = 1;
  28         }
  29         *fault_addr = NULL;
  30         *fault_catcher = NULL;
  31         return ret;
  32 }
  33