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
  16 void remap_data(void *segment_start, void *segment_end, int w)
  17 {
  18         void *addr;
  19         unsigned long size;
  20         int data, prot;
  21
  22         if(w) prot = PROT_WRITE;
  23         else prot = 0;
  24         prot |= PROT_READ | PROT_EXEC;
  25         size = (unsigned long) segment_end -
  26                 (unsigned long) segment_start;
  27         data = create_mem_file(size);
  28         addr = mmap(NULL, size, PROT_WRITE | PROT_READ, MAP_SHARED, data, 0);
  29         if(addr == MAP_FAILED){
  30                 perror("mapping new data segment");
  31                 exit(1);
  32         }
  33         memcpy(addr, segment_start, size);
  34         if(switcheroo(data, prot, addr, segment_start, size) < 0){
  35                 printf("switcheroo failed\n");
  36                 exit(1);
  37         }
  38 }
  39
  40 /*
  41  * Overrides for Emacs so that we follow Linus's tabbing style.
  42  * Emacs will notice this stuff at the end of the file and automatically
  43  * adjust the settings for this buffer only.  This must remain at the end
  44  * of the file.
  45  * ---------------------------------------------------------------------------
  46  * Local variables:
  47  * c-file-style: "linux"
  48  * End:
  49  */