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Date: Wed, 15 Jul 2015 14:44:04 +0200
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: TEST RELEASE: Cygwin 2.1.0-0.4
Message-ID: <20150715124404.GP16720@calimero.vinschen.de>
Reply-To: cygwin AT cygwin DOT com
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References: <20150705213417 DOT GH2918 AT calimero DOT vinschen DOT de> <70AD8D85-7D30-4894-857B-4FD12E55BBBE AT etr-usa DOT com> <55A58727 DOT 6060807 AT redhat DOT com> <55A5C073 DOT 1020401 AT cornell DOT edu> <20150715075117 DOT GA19844 AT calimero DOT vinschen DOT de>
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On Jul 15 09:51, Corinna Vinschen wrote:
> Hi guys,
>=20
> On Jul 14 22:07, Ken Brown wrote:
> > Entering directory
> > '/home/kbrown/src/cyglibsigsegv/libsigsegv-2.10-1.x86_64/build/tests'
> > Test passed.
> > PASS: sigsegv1.exe
> > Test passed.
> > PASS: sigsegv2.exe
> > Doing SIGSEGV pass 1.
> > Stack overflow 1 caught.
> > Doing SIGSEGV pass 2.
> > Stack overflow 2 caught.
> > Test passed.
> > PASS: sigsegv3.exe
> > SKIP: stackoverflow1.exe
> > SKIP: stackoverflow2.exe
>=20
> Any idea why these two tests have been skipped?  That means the
> HAVE_STACK_OVERFLOW_RECOVERY autoconf test failed.  You removed cygwin
> from the explicit
>=20
>   mingw* | cygwin*) sv_cv_have_stack_overflow_recovery=3Dyes ;;
>=20
> which is the right thing to do, but that means CFG_LEAVE has been
> set to leave-none.c, apparently.
>=20
> I haven't much time to look into that right now, but will later today if
> you don't beat me to it.

Got it.  What's needed is a Cygwin-specific fault-*.h file which exposes
how to fetch the stack pointer register from mcontext_t.  As you can see
from the plethora of fault-*.h files in the src subdir, this is highly
system-specific anyway.

Here's the set of files you need to rebuild libsigsegv for Cygwin 2.1.0,
with all tests running and passing on i686 and x86_64.  No other patch
is requied.

So, who of you is going to maintain it?


Thanks,
Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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NAME=3D"libsigsegv"
VERSION=3D"2.10"
RELEASE=3D2
CATEGORY=3DLibs
SUMMARY=3D"Handling page faults in user mode"
DESCRIPTION=3D"Library for handling page faults in user mode. A page fault =
occurs
when a program tries to access to a region of memory that is currently not
available. Mainly required to build clisp from source."
HOMEPAGE=3D"http://libsigsegv.sourceforge.net/"
# SRC_URI=3D"ftp://www.gnu.ftp.uni-erlangen.de/pub/gnu/${PN}/${PN}-${PV}.ta=
r.gz"
# SRC_URI=3D"http://puzzle.dl.sourceforge.net/sourceforge/${PN}/${PN}-${PV}=
.tar.bz2"
# SRC_URI=3D"ftp://ftp.gnu.org/pub/gnu/${PN}/${PN}-${PV}.tar.gz"
SRC_URI=3D"http://ftpmirror.gnu.org/${PN}/${PN}-${PV}.tar.gz"

DLLREV=3D2
MAKEOPTS=3D"-j1"
CYGCONF_ARGS=3D"--enable-shared"=20

PKG_NAMES=3D"${PN} ${PN}${DLLREV}"
PKG_CONTENTS[0]=3D"--exclude=3Dusr/bin/cygsigsegv-${DLLREV}.dll usr"
PKG_CONTENTS[1]=3D"usr/bin/cygsigsegv-${DLLREV}.dll"

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Content-Disposition: attachment; filename="libsigsegv-2.10-2.src.patch"
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--- origsrc/libsigsegv-2.10/configure.ac	2011-04-03 17:30:16.000000000 +0200
+++ src/libsigsegv-2.10/configure.ac	2015-07-15 14:30:22.264452393 +0200
@@ -419,6 +419,9 @@ if test -z "$CFG_FAULT" && test "$sv_cv_
               ;;
           esac
           ;;
+	cygwin*)
+	   CFG_FAULT=3Dfault-cygwin-i386.h
+	   ;;
         *)
           CFG_FAULT=3Dfault-posix-ucontext.h
           ;;
@@ -522,16 +525,6 @@ case "$host_os" in
     FAULT_CONTEXT_INCLUDE=3D'#include <windows.h>'
     CFG_FAULT=3Dfault-win32.h # nonexistent, just a dummy
     ;;
-  cygwin*)
-    FAULT_CONTEXT=3D'CONTEXT'
-    FAULT_CONTEXT_INCLUDE=3D'#include <windows.h>'
-    # Cygwin 1.7 uses fault-posix.h. Cygwin 1.5.x needs a hacky workaround.
-    if test -z "$CFG_FAULT"; then
-      CFG_FAULT=3Dfault-cygwin-old.h
-      AC_DEFINE([OLD_CYGWIN_WORKAROUND], [1],
-        [Define to 1 on Cygwin versions older than 1.7.])
-    fi
-    ;;
 esac
 if test -n "$CFG_FAULT"; then
   sv_cv_have_sigsegv_recovery=3Dyes
@@ -858,7 +851,7 @@ AC_CACHE_CHECK([if the system supports c
     sv_cv_have_stack_overflow_recovery=3Dyes
   else
     case "$host_os" in
-      mingw* | cygwin*) sv_cv_have_stack_overflow_recovery=3Dyes ;;
+      mingw*) sv_cv_have_stack_overflow_recovery=3Dyes ;;
       *)
         if test "$CFG_LEAVE" !=3D 'leave-none.c'; then
           if test "$sv_cv_sigaltstack" !=3D no; then
@@ -927,7 +920,7 @@ dnl Requires AC_CANONICAL_HOST, CFG_HAND
 dnl HAVE_SIGSEGV_RECOVERY, HAVE_STACK_OVERFLOW_RECOVERY.
=20
 case "$host_os" in
-  mingw* | cygwin*) CFG_HANDLER=3Dhandler-win32.c ;;
+  mingw*) CFG_HANDLER=3Dhandler-win32.c ;;
   *)
     if test -z "$CFG_HANDLER"; then
       if test $sv_cv_have_sigsegv_recovery =3D no \
--- origsrc/libsigsegv-2.10/src/fault-cygwin-i386.h	1970-01-01 01:00:00.000=
000000 +0100
+++ src/libsigsegv-2.10/src/fault-cygwin-i386.h	2015-07-15 14:30:47.5623414=
12 +0200
@@ -0,0 +1,33 @@
+/* Fault handler information.  Cygwin/i386 and Cygwin/x86_64 version.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+
+#include "fault-posix-ucontext.h"
+
+#if defined __x86_64__
+/* 64 bit registers */
+
+/* See winsup/cygwin/include/cygwin/signal.h */
+
+# define SIGSEGV_FAULT_STACKPOINTER  ((ucontext_t *) ucp)->uc_mcontext.rsp
+
+#else
+/* 32 bit registers */
+
+/* See winsup/cygwin/include/cygwin/signal.h */
+
+# define SIGSEGV_FAULT_STACKPOINTER  ((ucontext_t *) ucp)->uc_mcontext.esp
+
+#endif

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