[Qemu-devel] [Bug 739785] Re: qemu-i386 user mode on ARMv5 host fails (bash: fork: Invalid argument)

[Peter Maydell <peter.maydell@linaro.org>]

Steve: there are a number of issues with that patch:
 * x86 cpu_set_tls() doesn't belong in linux-user/syscall.c (but it's not trivial to put it in target-i386 because it's calling do_set_thread_area())
 * it's not "obviously correct" and the author says it needs review, and I'd have to dig out info about this obscure corner of the x86 ABI/architecture
 * I'm pretty sure it's not the only thing needed for threading support on x86, so (until/unless I look much more closely at the whole area) I don't have much confidence that this patch is a coherent single part of the required work
 * there's no Signed-off-by: line from the author so it can't be committed as is

Hopefully somebody else on the list will have time to look properly at
the patch; I'm afraid I don't expect to currently.

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Title:
  qemu-i386 user mode on ARMv5 host fails (bash: fork: Invalid argument)

Status in QEMU:
  New

Bug description:
  Good time of day everybody,

  I have been trying to make usermode qemu on ARM with plugapps
  (archlinux) with archlinux i386 chroot to work.

  1. I installed arch linux in a virtuabox and created a chroot for it with mkarchroot. Transferred it to my pogo plug into /i386/
  2. I comiled qemu-i386 static and put it into /i386/usr/bin/
  ./configure --static --disable-blobs --disable-system --target-list=i386-linux-user
  make

  3. I also compiled linux kernel 2.6.38 with CONFIG_BINFMT_MISC=y and installed it.
  uname -a
  Linux Plugbox 2.6.38 #4 PREEMPT Fri Mar 18 22:19:10 CDT 2011 armv5tel Feroceon 88FR131 rev 1 (v5l) Marvell SheevaPlug Reference Board GNU/Linux

  4. Added the following options into /etc/rc.local
  /sbin/modprobe binfmt_misc
  /bin/mount binfmt_misc -t binfmt_misc /proc/sys/fs/binfmt_misc
  echo ':qemu-i386:M::\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x03\x00:\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfb\xff\xff\xff:/usr/bin/qemu-i386:' >/proc/sys/fs/binfmt_misc/register

  5. Also copied ld-linux.so.3 (actually ld-2.13.so because ld-
  linux.so.3 is a link to that file) from /lib/ to /i386/lib/

  6.Now i chroot into /i386 and I get this:
  [root@Plugbox i386]# chroot .
  [II aI hnve ao n@P /]# pacman -Suy
  bash: fork: Invalid argument

  7.I also downloaded linux-user-test-0.3 from qemu website and ran the test:
  [root@Plugbox linux-user-test-0.3]# make
  ./qemu-linux-user.sh
  [qemu-i386]
  ../qemu-0.14.0/i386-linux-user/qemu-i386 -L ./gnemul/qemu-i386 i386/ls -l dummyfile
  BUG IN DYNAMIC LINKER ld.so: dl-version.c: 210: _dl_check_map_versions: Assertion `needed != ((void *)0)' failed!
  make: *** [test] Error 127

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