arch/um/kernel/tt/mem_user.c

   1 /*
   2  * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
   3  * Licensed under the GPL
   4  */
   5
   6 #include <stdlib.h>
   7 #include <stdio.h>
   8 #include <unistd.h>
   9 #include <string.h>
  10 #include <errno.h>
  11 #include <sys/mman.h>
  12 #include "tt.h"
  13 #include "mem_user.h"
  14 #include "user_util.h"
  15 #include "os.h"
  16
  17 void remap_data(void *segment_start, void *segment_end, int w)
  18 {
  19         void *addr;
  20         unsigned long size;
  21         int data, prot;
  22
  23         if(w) prot = PROT_WRITE;
  24         else prot = 0;
  25         prot |= PROT_READ | PROT_EXEC;
  26         size = (unsigned long) segment_end -
  27                 (unsigned long) segment_start;
  28         data = create_mem_file(size);
  29         addr = mmap(NULL, size, PROT_WRITE | PROT_READ, MAP_SHARED, data, 0);
  30         if(addr == MAP_FAILED){
  31                 perror("mapping new data segment");
  32                 exit(1);
  33         }
  34         memcpy(addr, segment_start, size);
  35         if(switcheroo(data, prot, addr, segment_start, size) < 0){
  36                 printf("switcheroo failed\n");
  37                 exit(1);
  38         }
  39 }
  40
  41 /*
  42  * Overrides for Emacs so that we follow Linus's tabbing style.
  43  * Emacs will notice this stuff at the end of the file and automatically
  44  * adjust the settings for this buffer only.  This must remain at the end
  45  * of the file.
  46  * ---------------------------------------------------------------------------
  47  * Local variables:
  48  * c-file-style: "linux"
  49  * End:
  50  */