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From: Blue Swirl <blauwirbel@gmail.com>
Date: Sat, 22 Aug 2009 18:14:02 +0300
Message-ID: <f43fc5580908220814r20686151pe75c5702aaca5a29@mail.gmail.com>
Subject: Re: [Qemu-devel] Qemu user-mode MacOS
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To: Toni <tonygio04@gmail.com>
Cc: qemu-devel@nongnu.org

On Fri, Aug 21, 2009 at 3:43 AM, Toni<tonygio04@gmail.com> wrote:
> Hi,
> I have a problem: I'm trying to install on Mac OS qemu user-mode, I need =
it,
> and so I find out that the only way is correct the wrong part of the sour=
ce
> code of qemu darwin_user, I correct some errors, but now I found out
> something that I don't undestand:
> =C2=A0=C2=A0CC =C2=A0 =C2=A0i386-darwin-user/cpu-exec.o
> /Users/ToNy/Desktop/qemu-0.10.5_prova/cpu-exec.c: In function
> =E2=80=98cpu_x86_signal_handler=E2=80=99:
> /Users/ToNy/Desktop/qemu-0.10.5_prova/cpu-exec.c:1182: error: dereferenci=
ng
> pointer to incomplete type
> /Users/ToNy/Desktop/qemu-0.10.5_prova/cpu-exec.c:1183: error: dereferenci=
ng
> pointer to incomplete type
> /Users/ToNy/Desktop/qemu-0.10.5_prova/cpu-exec.c:1186: error: dereferenci=
ng
> pointer to incomplete type
> /Users/ToNy/Desktop/qemu-0.10.5_prova/cpu-exec.c:1187: error: dereferenci=
ng
> pointer to incomplete type

> the problem may be the ucontext definition=C2=A0of the uc variable,=C2=A0=
that is
> defined in=C2=A0sys/ucontext.h,=C2=A0that call=C2=A0_structs.h where fina=
lly we found the
> struct:

Maybe struct mcontext is not defined? You could try splitting the code
to pieces, each trying one step in the pointer reference chain:

Instead of
# define EIP_sig(context)  (*((unsigned long*)&(context)->uc_mcontext->ss.e=
ip))
you could try something like
struct mcontext *mc;
struct sigaltstack *ss;

mc =3D uc->uc_mcontext;
ss =3D mc->ss;
pc =3D ss->eip;