This is the mail archive of the
binutils@sources.redhat.com
mailing list for the binutils project.
Re: relax jalr $t9 [R_MIPS_JALR symbol] to bal symbol
On Mar 25, 2003, Richard Henderson <rth at redhat dot com> wrote:
> One *could* have a PT_LOAD segment with >= 256MB alignment.
> Technically this should work. This is somewhat tricky to
> implement, since mmap doesn't take an alignment argument,
> so it would be difficult to honor in ld.so. (Indeed, I
> notice that glibc doesn't.)
glibc does pass a suggested map address to the kernel, computed using
the PH alignment.
> But, we've not been discussing using jal in ET_DYN objects.
> Instead, using them only in ET_EXEC objects. In that case
> the load address is fixed, and thus we can check at link
> time that we won't be crossing a segment boundary.
Right. We even have relocation we can use for this: R_MIPS_26.
However, at least for now, I'll have to leave the implementation of
this alternate relaxation as an exercise for the reader :-)
--
Alexandre Oliva Enjoy Guarana', see http://www.ic.unicamp.br/~oliva/
Red Hat GCC Developer aoliva at {redhat dot com, gcc.gnu.org}
CS PhD student at IC-Unicamp oliva at {lsd dot ic dot unicamp dot br, gnu.org}
Free Software Evangelist Professional serial bug killer