Date: Fri, 12 Jun 2020 07:13:08 +0200 From: Christophe Leroy <christophe.leroy@...roup.eu> To: Will Springer <skirmisher@...tonmail.com>, linuxppc-dev@...ts.ozlabs.org Cc: libc-alpha@...rceware.org, eery@...erfox.es, daniel@...aforge.org, musl@...ts.openwall.com, binutils@...rceware.org, libc-dev@...ts.llvm.org Subject: Re: ppc64le and 32-bit LE userland compatibility Le 06/06/2020 à 01:54, Will Springer a écrit : > On Saturday, May 30, 2020 3:17:24 PM PDT Will Springer wrote: >> On Saturday, May 30, 2020 8:37:43 AM PDT Christophe Leroy wrote: >>> There is a series at >>> https://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=173231 >>> to switch powerpc to the Generic C VDSO. >>> >>> Can you try and see whether it fixes your issue ? >>> >>> Christophe >> >> Sure thing, I spotted that after making the initial post. Will report >> back with results. >> >> Will [she/her] > > Sorry for the wait, I just sat down to work on this again yesterday. > > Tested this series on top of stable/linux-5.7.y (5.7.0 at the time of > writing), plus the one-line signal handler patch. Had to rewind to the > state of powerpc/merge at the time of the mail before the patch would > apply, then cherry-picked to 5.6 until I realized the patchset used some > functionality that didn't land until 5.7, so I moved it there. > > Good news is that `date` now works correctly with the vdso call in 32-bit > LE. Bad news is it seems to have broken things on the 64-bit side—in my > testing, Void kicks off runit but hangs after starting eudev, and in a > Debian Stretch system, systemd doesn't get to the point of printing > anything whatsoever. (I had to `init=/bin/sh` to confirm the date worked > in ppcle, although in ppc64le running `date` also hung the system when it > made the vdso call...) Not sure how to approach debugging that, so I'd > appreciate any pointers. > Does it breaks only ppc64le vdso or also ppc64 (be) vdso ? I never had a chance to run any test on ppc64 as I only have a kernel cross compiler. Would you have a chance to build and run vdsotest from https://github.com/nathanlynch/vdsotest ? Thanks Christophe
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