[PATCH 00/12] linux-user: Load a vdso for x86_64 and hppa

[Richard Henderson]

Supersedes: 20200519194452.9009-1-richard.henderson@linaro.org
Based-on: 20210618192951.125651-1-richard.henderson@linaro.org
("[PATCH v2 00/23] linux-user: Move signal trampolines to new page")

Previous cover letter:
> 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 turned 11 years old.
First posted April 4, 2010.

Change since previous:

Point (1) has been addressed: the vdso binary pre-processed,
validating the VDSO image, emitting a C array for the image,
collecting the set of relocations required, and identifying
any signal return trampolines.

Point (2) is still an issue in that the cross-build system is
tied up in tests/ makefiles.  It might be time to bite the bullet
and convert it all to meson.

I think there are fewer ??? than before.


r~


Richard Henderson (12):
  linux-user: Fix style problems in linuxload.c
  linux-user: Introduce imgsrc_read, imgsrc_read_alloc
  linux-user: Tidy loader_exec
  linux-user: Do not clobber bprm_buf swapping ehdr
  linux-user: Use ImageSource in load_elf_image
  linux-user: Use ImageSource in load_symbols
  linux-user: Replace bprm->fd with bprm->src.fd
  linux-user: Introduce imgsrc_mmap
  linux-user: Load vdso image if available
  linux-user: Add gen-vdso tool
  linux-user/x86_64: Add vdso
  linux-user/hppa: Add vdso and use it for rt_sigreturn

 linux-user/qemu.h               |  60 ++++++-
 linux-user/elfload.c            | 305 ++++++++++++++++++--------------
 linux-user/flatload.c           |   8 +-
 linux-user/gen-vdso.c           | 168 ++++++++++++++++++
 linux-user/hppa/signal.c        |   8 +-
 linux-user/linuxload.c          | 171 +++++++++++++-----
 linux-user/gen-vdso-elfn.c.inc  | 299 +++++++++++++++++++++++++++++++
 linux-user/hppa/Makefile.vdso   |   4 +
 linux-user/hppa/meson.build     |   6 +
 linux-user/hppa/vdso.S          | 149 ++++++++++++++++
 linux-user/hppa/vdso.ld         |  75 ++++++++
 linux-user/hppa/vdso.so         | Bin 0 -> 5192 bytes
 linux-user/meson.build          |   6 +-
 linux-user/x86_64/Makefile.vdso |   3 +
 linux-user/x86_64/meson.build   |   6 +
 linux-user/x86_64/vdso.S        | 122 +++++++++++++
 linux-user/x86_64/vdso.ld       |  74 ++++++++
 linux-user/x86_64/vdso.so       | Bin 0 -> 5912 bytes
 18 files changed, 1272 insertions(+), 192 deletions(-)
 create mode 100644 linux-user/gen-vdso.c
 create mode 100644 linux-user/gen-vdso-elfn.c.inc
 create mode 100644 linux-user/hppa/Makefile.vdso
 create mode 100644 linux-user/hppa/vdso.S
 create mode 100644 linux-user/hppa/vdso.ld
 create mode 100755 linux-user/hppa/vdso.so
 create mode 100644 linux-user/x86_64/Makefile.vdso
 create mode 100644 linux-user/x86_64/vdso.S
 create mode 100644 linux-user/x86_64/vdso.ld
 create mode 100755 linux-user/x86_64/vdso.so

-- 
2.25.1