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Re: [PATCH] Define an error function in the PPC simulator.
- From: John Baldwin <jhb at freebsd dot org>
- To: Mike Frysinger <vapier at gentoo dot org>
- Cc: gdb-patches at sourceware dot org
- Date: Tue, 06 Dec 2016 11:08:07 -0800
- Subject: Re: [PATCH] Define an error function in the PPC simulator.
- Authentication-results: sourceware.org; auth=none
- References: <20161124152917.52189-1-jhb@FreeBSD.org> <14422610.OhF153fWFS@ralph.baldwin.cx> <20161126221946.GR21655@vapier.lan>
On Saturday, November 26, 2016 02:19:46 PM Mike Frysinger wrote:
> On 25 Nov 2016 09:21, John Baldwin wrote:
> > On Friday, November 25, 2016 08:49:08 AM Mike Frysinger wrote:
> > > On 24 Nov 2016 07:29, John Baldwin wrote:
> > > > Previously this used the error function from GDB directly instead of
> > > > the error method in the host callbacks structure. This was exposed via
> > > > a link error when GDB was converted to C++. The error function invokes
> > > > the error callback similar to sim_io_error.
> > >
> > > ppc/main.c and ppc/misc.c already have error() definitions
> >
> > Yes, though those are not included when libsim is linked into gdb itself.
> > misc.o is explicitly included for certain binaries in sim/ppc/Makefile.in.
> > Note that zalloc() is defined in both misc.c and sim_calls.c as well, I
> > suspect for similar reasons.
> >
> > Looking at main.c, it overrides various symbols (sim_io_*, also
> > zalloc) that are defined in sim_calls.c with local versions. (Perhaps
> > psim should not be linking sim_calls.o in at all?) 'error' is another
> > such symbol.
>
> yes, the ppc sim is a bit of mess due to its history. i'm not sure we
> should just keep throwing onto the pile though.
>
> if psim/main.c doesn't need it, then dropping it sounds easy enough.
I misread the Makefiles a bit and psim doesn't link in sim_calls.o, so it
still needs its own zalloc() and error() in main.c.
In particular, ppc/Makefile generates the libsim.a that gdb links against
which includes sim_calls.o (via GDB_OBJ) but not main.o or misc.o. The
psim binary includes main.o (but not sim_calls.o or misc.o), and the other
binaries (igen, dgen, tmp-filter) include misc.o (but not sim_calls.o or
main.o).
While it might make sense to merge bits of main.c with misc.c, I think the
GDB-specific functions in sim_calls.c are always going to be required
(including a custom error() that invokes GDB's error hook).
--
John Baldwin