Re: [PATCH] SEGV whilst placing sections

["H. J. Lu" <hjl at lucon dot org>]

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?

Thanks.


H.J.