Re: [PATCH] SEGV whilst placing sections

[Mark Shinwell <shinwell at codesourcery dot com>]

H. J. Lu wrote:
> On Wed, Jun 21, 2006 at 08:23:18AM +0100, Mark Shinwell wrote:
> > H. J. Lu wrote:
> > > On Tue, Jun 20, 2006 at 03:08:52PM +0100, Mark Shinwell wrote:
> > > > The following C code, when compiled for an ARM target with -fexceptions
> > > > and linked using the attached linker script, causes SEGV in
> > > > lang_insert_orphan () when placing the .ARM.extab section.
> > > >
> > > > int f(int *);
> > > >
> > > > int g(void)
> > > > {
> > > >    int a;
> > > >    return f(&a);
> > > > }
> > > >
> > > > In this case, the "after" parameter to lang_insert_orphan () corresponds
> > > > to the .rodata section, the last in the linked list of "asection"s.
> > > > The upshot is that place->section points at the "next" entry of the final
> > > > section in the list, .rodata.  This "next" pointer is NULL, so "as" ends 
> > > > up
> > > > NULL, and we fault when "as->prev" is computed.
> > > Can you provide a testcase in assembly so that people can check it
> > > with a cross binutils?
> > Attached is the output of compiling the above with -fexceptions.
> > Now the following link should segfault (linker script attached to previous
> > mail):
> >
> > arm-none-linux-gnueabi-as -o nonleaf.o nonleaf.s
> > arm-none-linux-gnueabi-ld -T vmlinux.lds -o nonleaf nonleaf.o
> >
> > Alan, is this test case ok for you?
>
> Can you create one for ld/testsuite/ld-arm?

I've just committed the patch, but I'll construct such a testcase
and circulate it.

Mark