Re: [PATCH 0/2] linux-user: Load a vdso for x86_64

[Laurent Vivier]

Le 19/05/2020 à 21:44, Richard Henderson a écrit :
> The subject of AT_SYSINFO came up on launchpad recently.
> 
> There is definite room for improvement in all of this:
> 
> (1) We could build the vdso binary into qemu instead of really
>     loading it from the file system.  This would obviate the
>     several problems of locating the .so file.  It would also
>     mean that --static builds continue to create a standalone
>     qemu binary.
> 
> (2) We could use our cross-build system to build the vdso.
>     Though we'd still likely want to keep the image in git
>     along side the other rom images for when cross-build is
>     not available.
> 
> (3) There are some ??? comments where some decisions could be made,
>     and other ??? that are merely commenting on weirdness.
> 
> (4) It shouldn't take too much effort to create vdsos for the
>     other architectures.  But we should get this one as clean
>     as we can first.
> 
> Amusingly, this patch set has just turned 10 years old.
> First posted April 4, 2010.  I don't recall ever seeing
> any review on the several postings over the years.
> 
> 
> r~
> 
> 
> Richard Henderson (2):
>   linux-user: Build vdso for x64.
>   linux-user: Load a VDSO for x86-64.
> 
>  Makefile                  |   4 +-
>  linux-user/elfload.c      | 203 +++++++++++++++++++++++++++++++++++++-
>  pc-bios/Makefile          |   5 +
>  pc-bios/vdso-linux-x64.S  | 115 +++++++++++++++++++++
>  pc-bios/vdso-linux-x64.ld |  81 +++++++++++++++
>  pc-bios/vdso-linux-x64.so | Bin 0 -> 7500 bytes
>  6 files changed, 401 insertions(+), 7 deletions(-)
>  create mode 100644 pc-bios/vdso-linux-x64.S
>  create mode 100644 pc-bios/vdso-linux-x64.ld
>  create mode 100755 pc-bios/vdso-linux-x64.so
> 

Applied to my linux-user branch.

Thanks,
Laurent