Christophe Leroy [off-list ref] writes:

Le 24/09/2020 à 15:17, Christophe Leroy a écrit :

quoted

Le 17/09/2020 à 14:33, Michael Ellerman a écrit :

quoted

Christophe Leroy [off-list ref] writes:

quoted

What is the status with the generic C vdso merge ?
In some mail, you mentionned having difficulties getting it working on
ppc64, any progress ? What's the problem ? Can I help ?

Yeah sorry I was hoping to get time to work on it but haven't been able
to.

It's causing crashes on ppc64 ie. big endian.

...

quoted

Can you tell what defconfig you are using ? I have been able to setup a full glibc PPC64 cross 
compilation chain and been able to test it under QEMU with success, using Nathan's vdsotest tool.

What config are you using ?

ppc64_defconfig + guest.config

Or pseries_defconfig.

I'm using Ubuntu GCC 9.3.0 mostly, but it happens with other toolchains too.

At a minimum we're seeing relocations in the output, which is a problem:

  $ readelf -r build\~/arch/powerpc/kernel/vdso64/vdso64.so
  
  Relocation section '.rela.dyn' at offset 0x12a8 contains 8 entries:
    Offset          Info           Type           Sym. Value    Sym. Name + Addend
  000000001368  000000000016 R_PPC64_RELATIVE                     7c0
  000000001370  000000000016 R_PPC64_RELATIVE                     9300
  000000001380  000000000016 R_PPC64_RELATIVE                     970
  000000001388  000000000016 R_PPC64_RELATIVE                     9300
  000000001398  000000000016 R_PPC64_RELATIVE                     a90
  0000000013a0  000000000016 R_PPC64_RELATIVE                     9300
  0000000013b0  000000000016 R_PPC64_RELATIVE                     b20
  0000000013b8  000000000016 R_PPC64_RELATIVE                     9300



cheers