Daniel Jacobowitz <dan@debian.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.
That's what I've asked myself also when fixing the dynamic linker.
But Ralf convinced me that $31 will get filled in (and I verified that
it did) - otherwise the dynamic linker would not work on any system at
all.
But it might be worth checking if Guido notices a problem.
Btw. could anybody send me a patch documenting this instruction so
that next time everybody knows directly what's going on?
Thanks,
Andreas
--
Andreas Jaeger
SuSE Labs aj@suse.de
private aj@arthur.inka.de
http://www.suse.de/~aj
