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From: Corinna Vinschen <corinna@sourceware.org> To: cygwin-cvs@sourceware.org Subject: [newlib-cygwin] Cygwin: memory_layout.h: fix comments Date: Fri, 28 Oct 2022 14:27:36 +0000 (GMT) [thread overview] Message-ID: <20221028142736.B6D30384B82B@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=0508e11f88f73df500f91f75e0314c3592c0526b commit 0508e11f88f73df500f91f75e0314c3592c0526b Author: Corinna Vinschen <corinna@vinschen.de> Date: Wed Oct 26 21:26:37 2022 +0200 Cygwin: memory_layout.h: fix comments Signed-off-by: Corinna Vinschen <corinna@vinschen.de> Diff: --- winsup/cygwin/local_includes/memory_layout.h | 22 +++------------------- 1 file changed, 3 insertions(+), 19 deletions(-) diff --git a/winsup/cygwin/local_includes/memory_layout.h b/winsup/cygwin/local_includes/memory_layout.h index 22e68b93e..18e7e4d69 100644 --- a/winsup/cygwin/local_includes/memory_layout.h +++ b/winsup/cygwin/local_includes/memory_layout.h @@ -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 details. */ -/* We use fixed addresses outside the low 32 bit arena, which is exclusively - used by the OS now: - - 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. */ +/* This is where Cygwin executables are loaded to, unless dynamicbase is + enabled in the PE/COFF header of the executable file. */ #define EXECUTABLE_ADDRESS 0x100400000UL /* 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. 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. */ #define USERHEAP_START 0xa00000000UL
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