Re: [Gcl-devel] Re: gcl/maxima on hppa
One more observation here which may be helpful -- on hppa, malloced
memory starts at ~ 0x200000 and the stack counts *up* from ~
0xb0000000. gcl can deal with this without difficulty, except for
the fact that variables declared *volatile* have addresses in the
0x7a0000 range. This puts them in the middle of the lisp core, which
is sure to messup the gc. I can either try eliminating the volatile
declarations, which will likely lead to clobbering errors, or find a
way to start malloc and sbrk at say 0x1000000, and treat the 0x7a0000
range as a separate stack for the gc. This looks like the two stack
setup on ia64 somewhat. As a third possibility, I could find a way to
put volatile variables on the main stack. This would e the easiest of
course from gcl's end.
Can anyone advise here?
email@example.com (LaMont Jones) writes:
> On Fri, Sep 13, 2002 at 10:17:04AM -0400, Camm Maguire wrote:
> > Greetings! I think I may have stumbled on a possible explanation for
> > gcl's build failure on hppa. Hppa alone will not relocate (i.e. allow
> > dlopen to open) modules not compiled with -fPIC. All other
> > architectures on which dlopen is currently used (alpha, ia64, mips,
> > mipsel)
> Actually, mips and mipsel force -fPIC on all compiles. The spec requires
> that shared objects be built with -fPIC.
> > 1) gcl can also relocate and load objects via a direct call to the BFD
> > library routine bfd_get_relocated_section_contents. This method is
> > currently used as the default on i386, sparc, ppc, s390, m68k and
> > arm. It is not yet fully implemented on hppa. Completing this
> > routine should enable a fully functional gcl, maxima, and in the
> > hopefully near future acl2 on this platform.
> > 2) Find a way to load objects with dlopen without -fPIC. Attempting
> > this results in the error that a certain relocation output by the
> > compiler cannot be handled by dlopen. Perhaps there is some other
> > gcc compiler option short of the full -fPIC which can avoid this
> > relocation?
> Nope. The non-PIC is truly not position independent.
> > In either case, I will need a knowledgeable hppa person to advise,
> > discuss and help generate patches for this to get fixed any time soon.
> > Gcl can build its own bfd library, so patches here can be simply
> > incorporated.
> willy would be a good target. I'm going to be out of town for a couple
> of weeks, but (if it's still pending) I'd be happy to help when I get
> Gcl-devel mailing list
Camm Maguire firstname.lastname@example.org
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