On Sat, Dec 08, 2001 at 09:52:01PM +0100, Andreas Jaeger wrote:
> Daniel Jacobowitz <firstname.lastname@example.org> writes:
> > On Sat, Dec 08, 2001 at 04:18:53PM +0100, Andreas Jaeger wrote:
> >> > " bltzal $0, here\n"
> >> > " nop\n"
> >> > "here: subu %0, $31, %0\n"
> >> Subtract shared address of "here" from address of "here" at build time
> >> - and you know at which address byte 0 of the shared library is
> >> loaded.
> > Wait a second. Does bltzal fill in $31 even on a not-taken branch?
> > Because bltzal $0 should never be taken. My handy MIPS reference and
> > SPIM seem to agree that it won't fill in $31.
> I just checked the MIPS R4000 Microprocessor Manual, 2nd Ed. by Joe
> Heinrich and it mentions "Unconditanally, the address of the
> instruction after the delay slot is placed in the link register, $31".
> Therefore the code is correct.
OK, thanks. Yet another thing that changed between my simulator and my
Daniel Jacobowitz Carnegie Mellon University
MontaVista Software Debian GNU/Linux Developer