On Fri, 20 Aug 1999, Andrew Gallatin wrote:
>
> Doug Rabson writes:
> > On Thu, 19 Aug 1999, Andrew Gallatin wrote:
> >
> > >
> > > I do most of my development on alphas & I just turned some local code
> > > into a loadable kernel module. It works fine when compiled into the
> > > kernel statically, but fails miserably when loaded into an alpha
> > > kernel as a module. This alpha is running -current from monday or
> > > so.
> > >
> > > After a day or so of debugging, I decided to run
> > > it on an x86 -- it ran just fine. I've narrowed the problem down to
> > > one involving optimization and have extracted a simple, reproducable
> > > test case.
> > >
> > > When the test module is loaded without optimization (CFLAGS += -g
> > > -O0), it prints the following (which is correct):
> >
> > It looks like we aren't handling the relocations correctly. When I get a
> > chance, I will try to look at it. If you want to have another look, the
> > code at fault is probably in alpha/alpha/elf_machdep.c and you can get a
> > list of relocations in the module with 'objdump --dynamic-reloc foo.ko'.
>
> Thanks for the pointer, it was right on the money. It turns out that
> at the default optimization level, the objdump output looks like this:
>
> <...>
> 0000000000010ea8 RELATIVE *ABS*
> 0000000000010e80 GLOB_DAT Xmit_completes+0x0000000000000028
> 0000000000010e88 GLOB_DAT Xmit_completes+0x0000000000000008
> 0000000000010e90 GLOB_DAT Xmit_completes+0x0000000000000010
> 0000000000010e98 GLOB_DAT Xmit_completes+0x0000000000000018
> 0000000000010ea0 GLOB_DAT Xmit_completes
> 0000000000010e70 JMP_SLOT printf
> <...>
>
> I've just committed a patch to alpha/alpha/elf_machdep.c which takes
> into account the addends for objects of type R_ALPHA_GLOB_DAT. This
> fixes my problem. Should it be MFC'ed?
I think it can be MFC'ed right away. There are no dependancies on the rest
of the system and its a serious problem.
--
Doug Rabson Mail: [EMAIL PROTECTED]
Nonlinear Systems Ltd. Phone: +44 181 442 9037
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