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Comparing glibc with uClibc makes me think that the delta calculations are
wrong here. Comparing some more I still think there are a
data_words[index] assignments missing. Here is a path that has both the
data_words[index] and the above delta calclations.
This also fixes a terribly obvious bug, also spotted by Joakim, which Erik
introduced when he copied things from the i386 ldso code.
With this patch applied, things now seem to be working perfectly!
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Another little patch fix the configuration for the SH3 targets. The SH3 has
no FPU, but our ldso runs fine on a SH3 target. (I think the
ldso should also run on a SH2 target, so you might want to enable the ldso
for SH2 targets too. But I can't test it, since I have no such a system) :
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Hello Erik,
to compile the new uClibc release for a SH3 we need some little
modifications:
First I fix the crt[in].S files, so we can use them for big endian and
little endian targets.
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Hi again
Back at work. Here is a patch that fixes the 2 errors I found yesterday.
I have excluded the "data_words[index]" part for now.
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broke a couple of days ago. :-(
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Oops, found another ppc 8xx bug.
8xx CPUs may need this as well to work:
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> Very interesting. Do you have any suggestions for how
> we could fix our powerpc shared library loader
Removing those instr. comes with a very big performance
penalty. To flush the dcache you will have read up to 8KB
dummy data and to invalidate the icache you will have to
execute up to 16KB nops. I don't know of any other way from
user space.
hmm, actually I think it will work reliable to perform a
store to the same page(s) as the dcbst/icbi will act on. That
way you will make the DTLB Error happen(if any) prior to the
dcbst/icbi. The worst thing that can happen then is a regular
DTLB Miss and that works for dcbst/icbi.
You will have to lookout for if dcbst/icbi crosses a page
boundary. Then you will have to perform a store to both
pages.
Jocke
# And again later writes:
Hi again
I think I know what the problem is. The
PPC_DCBST;PPC_SYNC;PPC_ICBI;PPC_ISYNC sequence is executed
even if no modification has been done i some cases:
_dl_linux_resolver(), the last else has no store for insns[0].
these is a insns[1] = OPCODE_B(delta - 4) that
does not have a PPC_DCBST.
_dl_do_lazy_reloc(), for R_PPC_NONE there is no store.
for R_PPC_JMP_SLOT there is a
insns[1] = OPCODE_B(delta)that does not
have a PPC_DCBST.
_dl_do_reloc(), for R_PPC_COPY there is no store.
for R_PPC_JMP_SLOT there is a
reloc_addr[1] = OPCODE_B(delta) that does not
have a PPC_DCBST.
_dl_init_got(), I THINK that the
PPC_DCBST(plt);
PPC_DCBST(plt+4);
PPC_DCBST(plt+8);
PPC_SYNC;
PPC_ICBI(plt);
PPC_ICBI(plt+4);
PPC_ICBI(plt+8);
PPC_ISYNC;
is off a bit. The address range does not match the sum
of the plt[] and tramp[] address range.
Jocke
# And then later added the comment:
I think that the tramp[] part should be included in the
PPC_DCBST/PPC_ICBI sequence. Then you have to add entries for
plt+12 and plt+16. If the tramp[] part should be excluded,
then all is well.
Jocke
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showed up while running the latest LTP testsuite.
-Erik
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broke the install target
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around...
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contained a digit. Also adjust a comment.
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Dear Erik,
We downloded uClibc lattest version from the CVS. Still there are some
minor problems with extra/Configs/Config.e1
You have actually set ARCH_HAS_C_SYMBOL_PREFIX to NO which is not
correct for our architecture. Please apply the patch that will fix the
problem.
Best Regards,
- George
P.S. Patch also removes some irritating comments we have added in the past.
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things like mmx/3dnow/etc. These are not inline, and will therefore not be as
fast as modifying the headers to use inlines (and cannot therefore do tricky
things when dealing with const memory). But they should (I hope!) be faster
than their generic equivalents....
More importantly, these should provide a good example for others to follow when
adding arch specific optimizations.
-Erik
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static version. This will need further work later on, but should do the job for
the time being,
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need to be fixed properly. I tried, but I was unable to build a cross
toolchain for each of these (using stock binutils and gcc) so it is someone
else's problem to fix them now.
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