2022-10-27 03:06:54 +08:00
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/* memory_layout.h: document all addresses crucial to the fixed memory
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layout of Cygwin processes.
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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/* We use fixed addresses outside the low 32 bit arena, which is exclusively
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used by the OS now:
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- The executable starts at 0x1:00400000L
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- The Cygwin DLL starts at 0x1:80040000L
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- Rebased DLLs are located from 0x2:00000000L up to 0x4:00000000L
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- auto-image-based DLLs are located from 0x4:00000000L up to 0x6:00000000L
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- Thread stacks are located from 0x6:00000000L up to 0x8:00000000L.
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- So the heap starts at 0x8:00000000L. */
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/* TODO: Make Cygwin work with ASLR.
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- The executable starts at 0x1:00400000L
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- Rebased non-ASLRed DLLs from 0x2:00000000L up to 0x4:00000000L
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- auto-image-based non-ASLRed DLLs from 0x4:00000000L up to 0x6:00000000L
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- Thread stacks are located from 0x6:00000000L up to 0x8:00000000L.
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- cygheap from 0x8:00000000L up to 0xa:00000000L.
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- So the heap starts at 0xa:00000000L. */
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/* This is where the Cygwin executables are loaded to. */
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#define EXECUTABLE_ADDRESS 0x100400000UL
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/* Fixed address set by the linker. The Cygwin DLL will have this address set
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in the DOS header. Keep this area free with ASLR, for the case where
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dynamicbase is accidentally not set in the PE/COFF header of the DLL. */
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#define CYGWIN_DLL_ADDRESS 0x180040000UL
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/* Rebased DLLs are located in this 16 Gigs arena. Will be kept for
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backward compatibility. */
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#define REBASED_DLL_STORAGE_LOW 0x200000000UL
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#define REBASED_DLL_STORAGE_HIGH 0x400000000UL
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/* Auto-image-based DLLs are located in this 16 Gigs arena. This is used
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by the linker to set a default address for DLLs. */
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#define AUTOBASED_DLL_STORAGE_LOW 0x400000000UL
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#define AUTOBASED_DLL_STORAGE_HIGH 0x600000000UL
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/* Storage area for thread stacks. */
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#define THREAD_STORAGE_LOW 0x600000000UL
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#define THREAD_STORAGE_HIGH 0x800000000UL
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2022-10-27 03:16:35 +08:00
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/* That's where the cygheap is located. CYGHEAP_STORAGE_INITIAL defines the
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end of the initially committed heap area. */
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#define CYGHEAP_STORAGE_LOW 0x800000000UL
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#define CYGHEAP_STORAGE_INITIAL 0x800300000UL
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#define CYGHEAP_STORAGE_HIGH 0xa00000000UL
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2022-10-27 03:06:54 +08:00
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/* This is where the user heap starts. There's no defined end address.
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The user heap pontentially grows into the mmap arena. However,
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the user heap grows upwar4ds and the mmap arena grows downwards,
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so there's not much chance to meet unluckily. */
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2022-10-27 03:16:35 +08:00
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#define USERHEAP_START 0xa00000000UL
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2022-10-27 03:06:54 +08:00
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/* The memory region used for memory maps.
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Up to Win 8 only 44 bit address space, 48 bit starting witrh 8.1, so
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the max value is variable. */
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#define MMAP_STORAGE_LOW 0x001000000000L /* Leave ~32 Gigs for heap. */
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#define MMAP_STORAGE_HIGH wincap.mmap_storage_high ()
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