winsup/cygwin/local_includes/memory_layout.h

   1 /* memory_layout.h: document all addresses crucial to the fixed memory
   2                     layout of Cygwin processes.
   3
   4 This file is part of Cygwin.
   5
   6 This software is a copyrighted work licensed under the terms of the
   7 Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
   8 details. */
   9
  10 /* This is where Cygwin executables are loaded to, unless dynamicbase is
  11    enabled in the PE/COFF header of the executable file. */
  12 #define EXECUTABLE_ADDRESS              0x100400000UL
  13
  14 /* Fixed address set by the linker. The Cygwin DLL will have this address set
  15    in the DOS header. Keep this area free with ASLR, for the case where
  16    dynamicbase is accidentally not set in the PE/COFF header of the DLL. */
  17 #define CYGWIN_DLL_ADDRESS              0x180040000UL
  18
  19 /* Area for Cygwin-specific shared memory regions. */
  20 #define SHARED_REGIONS_ADDRESS_LOW      0x1a0000000UL
  21 #define SHARED_REGIONS_ADDRESS_HIGH     0x200000000UL
  22
  23 /* Rebased DLLs are located in this 16 Gigs arena.  Will be kept for
  24    backward compatibility. */
  25 #define REBASED_DLL_STORAGE_LOW         0x200000000UL
  26 #define REBASED_DLL_STORAGE_HIGH        0x400000000UL
  27
  28 /* Auto-image-based DLLs are located in this 16 Gigs arena.  This is used
  29    by the linker to set a default address for DLLs. */
  30 #define AUTOBASED_DLL_STORAGE_LOW       0x400000000UL
  31 #define AUTOBASED_DLL_STORAGE_HIGH      0x600000000UL
  32
  33 /* Storage area for thread stacks. */
  34 #define THREAD_STORAGE_LOW              0x600000000UL
  35 #define THREAD_STORAGE_HIGH             0x800000000UL
  36
  37 /* That's where the cygheap is located. CYGHEAP_STORAGE_INITIAL defines the
  38    end of the initially committed heap area. */
  39 #define CYGHEAP_STORAGE_LOW             0x800000000UL
  40 #define CYGHEAP_STORAGE_INITIAL         0x800300000UL
  41 #define CYGHEAP_STORAGE_HIGH            0xa00000000UL
  42
  43 /* This is where the user heap starts.  There's no defined end address.
  44    The user heap pontentially grows into the mmap arena.  However,
  45    the user heap grows upwards and the mmap arena grows downwards,
  46    so there's not much chance to meet unluckily. */
  47 #define USERHEAP_START                  0xa00000000UL
  48
  49 /* The memory region used for memory maps.  Mmaps grow downwards.
  50    Set the lowest address to leave ~32 Gigs for heap. */
  51 #define MMAP_STORAGE_LOW                0x001000000000UL
  52 #define MMAP_STORAGE_HIGH               0x700000000000UL
  53
  54 /* Default number of pages used as thread stack guard pages. */
  55 #define DEFAULT_GUARD_PAGE_COUNT        3