Hi,
I have used valgrind (3.2.3 and 3.3.1) successfully on an embedded target
with an e500 processor. My kernel, compiler and libraries are quite
different to those reported but I just wanted to say that it works for me.
Looking at my ld.so (uClibc implementation) there aren't any vmhaddshs
instructions which may mean that my compiler (gcc 4.1.1 + patches) is not
using the special e500 instructions or that uClibc doesn't. I'll double
check my compiler flags to see if I'm compiling for e500 or just generic ppc
but there may be a possible workaround.
Has anyone got some example sourcode that compiles to use this instruction?
On Wed, Oct 8, 2008 at 3:30 AM, Julian Seward <[EMAIL PROTECTED]> wrote:
>
> Hi. I did look into this problem a few months back. The difficulty is
> that
> supporting e500 is a lot more complex than merely making the isel
> instruction
> work. Once isel is fixed, you then run into this, as you observed
>
> > Output of objdump -d ld-2.3.3.so file where the error has been shown
> > (vmhaddshs - I guess so).
> >
> > 0000c254 <_dl_catch_error>:
> > c254: 94 21 fd 50 stwu r1,-688(r1)
> > c258: 7c 08 02 a6 mflr r0
> > c25c: 39 c0 02 98 li r14,664
> > c260: 48 01 bd a1 bl 28000 <_DYNAMIC+0xbc>
> > c264: 13 c1 73 20 vmhaddshs v30,v1,v14,v12
> > c268: 39 c0 02 a0 li r14,672
> > c26c: 7f c8 02 a6 mflr r30
> > c270: 13 e1 73 20 vmhaddshs v31,v1,v14,v12
>
> These appear to be e500 specific instructions which occupy the same
> decoding
> space as Altivec (vmhaddshs is an Altivec instruction, and it is complete
> nonsense for it to appear in this context).
>
> So fixing e500 support properly would require both adding support for some
> unknown number of new instructions, and also messing with the cpu
> capabilities
> stuff so as to know whether to decode such instructions as Altivec or e500
> extensions. And, lacking access to any real e500 hardware, at that point
> my investigation simply stopped.
>
> J
>
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