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Cygwin: memory_layout.h: fix comments 

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen 2022-10-26 21:26:37 +02:00
parent 60675f1a7e
commit 0508e11f88
1 changed files with 3 additions and 19 deletions
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22
winsup/cygwin/local_includes/memory_layout.h
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@ -7,24 +7,8 @@ This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */ details. */
/* We use fixed addresses outside the low 32 bit arena, which is exclusively /* This is where Cygwin executables are loaded to, unless dynamicbase is
used by the OS now: enabled in the PE/COFF header of the executable file. */
- The executable starts at 0x1:00400000L
- The Cygwin DLL starts at 0x1:80040000L
- Rebased DLLs are located from 0x2:00000000L up to 0x4:00000000L
- auto-image-based DLLs are located from 0x4:00000000L up to 0x6:00000000L
- Thread stacks are located from 0x6:00000000L up to 0x8:00000000L.
- So the heap starts at 0x8:00000000L. */
/* TODO: Make Cygwin work with ASLR.
- The executable starts at 0x1:00400000L
- Rebased non-ASLRed DLLs from 0x2:00000000L up to 0x4:00000000L
- auto-image-based non-ASLRed DLLs from 0x4:00000000L up to 0x6:00000000L
- Thread stacks are located from 0x6:00000000L up to 0x8:00000000L.
- cygheap from 0x8:00000000L up to 0xa:00000000L.
- So the heap starts at 0xa:00000000L. */
/* This is where the Cygwin executables are loaded to. */
#define EXECUTABLE_ADDRESS 0x100400000UL #define EXECUTABLE_ADDRESS 0x100400000UL
/* Fixed address set by the linker. The Cygwin DLL will have this address set /* Fixed address set by the linker. The Cygwin DLL will have this address set
@ -64,7 +48,7 @@ details. */
/* This is where the user heap starts. There's no defined end address. /* This is where the user heap starts. There's no defined end address.
The user heap pontentially grows into the mmap arena. However, The user heap pontentially grows into the mmap arena. However,
the user heap grows upwar4ds and the mmap arena grows downwards, the user heap grows upwards and the mmap arena grows downwards,
so there's not much chance to meet unluckily. */ so there's not much chance to meet unluckily. */
#define USERHEAP_START 0xa00000000UL #define USERHEAP_START 0xa00000000UL