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On 64 bit, only create new thread stack if started from 32 bit process on affected platforms

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* dcrt0.cc (dll_crt0_0): On 64 bit, set wow64_needs_stack_adjustment
        if not started from a 64 bit process.
        (_dll_crt0): Enable wow64_needs_stack_adjustment branch on 64 bit
        as well.  Remove 64 bit only code.  Introduce CREATE_STACK and
        FIX_STACK macros to conditionalize the code.  Rearrange and
        partially rewrite comments.
        * wincap.h (wincaps::has_3264_stack_broken): New element.
        * wincap.cc: Implement above element throughout.
        (wincapc::init): Set has_3264_stack_broken to false on 32 bit.
        * wow64.cc: Enable functionality on 64 bit architecture, except for
        wow64_revert_to_original_stack.  Enhance comments to explain.
        (wow64_eval_expected_main_stack): Make 64 bit clean.
        (wow64_test_for_64bit_parent): Ditto.
        * wow64.h: Export wow64_revert_to_original_stack on 32 bit only,
        everything else on all architectures.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen
2015-12-03 22:56:44 +01:00
parent 8f4da28eb6
commit 12743c2d5d
6 changed files with 90 additions and 60 deletions
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12
winsup/cygwin/wow64.h
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@@ -1,6 +1,6 @@
/* wow64.h
Copyright 2011, 2012 Red Hat, Inc.
Copyright 2011, 2012, 2015 Red Hat, Inc.
This file is part of Cygwin.
@@ -8,14 +8,12 @@ This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#ifndef __x86_64__
/* WOW64 only plays a role in the 32 bit version. Don't use any of this
in the 64 bit version. */
extern bool NO_COPY wow64_needs_stack_adjustment;
extern bool wow64_test_for_64bit_parent ();
extern PVOID wow64_revert_to_original_stack (PVOID &allocationbase);
extern void wow64_respawn_process () __attribute__ ((noreturn));
#ifndef __x86_64__
extern PVOID wow64_revert_to_original_stack (PVOID &allocationbase);
#endif /* !__x86_64__ */