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Date: Fri, 12 Oct 2012 10:42:00 -0000
From: Eli Zaretskii <eliz@gnu.org>
Subject: Re: Calling __stdcall functions in the inferior
In-reply-to: <201210120953.q9C9rqfu020865@glazunov.sibelius.xs4all.nl>
To: Mark Kettenis <mark.kettenis@xs4all.nl>
Cc: gdb@sourceware.org
Reply-to: Eli Zaretskii <eliz@gnu.org>
Message-id: <834nm07z0s.fsf@gnu.org>
References: <83a9vs89r9.fsf@gnu.org> <201210120953.q9C9rqfu020865@glazunov.sibelius.xs4all.nl>
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> Date: Fri, 12 Oct 2012 11:53:52 +0200 (CEST)
> From: Mark Kettenis <mark.kettenis@xs4all.nl>
> CC: gdb@sourceware.org
> 
> > Date: Fri, 12 Oct 2012 08:50:02 +0200
> > From: Eli Zaretskii <eliz@gnu.org>
> > 
> > Is there a way to call __stdcall functions in the inferior from GDB,
> > while debugging a C program?  The case in point is GetLastError, but
> > any other function from the Windows API has this problem.
> 
> Probably not.  We only implement the System V and Darwin calling
> conventions for i386.

But we also support Pascal, AFAIK, which uses this convention: the
callee pops the stack.  The only difference is that the arguments are
pushed right to left, unlike with Pascal.  So I thought we already had
this somewhere...

> I'm not familliar with the Windows world (and don't really have a
> desire to become familliar).  But I assume "normal" (non-__stdcall)
> functions use the System V calling conventions?

Yes, it's the normal cdecl calling convention.

> * You'll need to figure out a way to distinguish __stdcall functions
>   from "normal" functions.

Does someone know where GCC stashes this info?  "ptype" doesn't reveal
this detail, AFAICS.

Thanks.