[Qemu-devel] [Bug 1263747] Re: Arm64 fails to run a binary which runs OK on real hardware

[Richard Jones]

One thing I notice is that caml_c_call is the only function that uses
the instruction "ret xM" (in all other places the code uses the default
"ret" with implicit x30).  Hmmm .. do we emulate "ret xM"?

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https://bugs.launchpad.net/bugs/1263747

Title:
  Arm64 fails to run a binary which runs OK on real hardware

Status in QEMU:
  New

Bug description:
  Note this is using the not-yet-upstream aarch64 patches from:

  https://github.com/susematz/qemu/tree/aarch64-1.6

  ---- ----

  This binary:

  http://oirase.annexia.org/tmp/test.gz

  runs OK on real aarch64 hardware.  It is a statically linked Linux
  binary which (if successful) will print "hello, world" and exit
  cleanly.

  On qemu-arm64 userspace emulator it doesn't print anything and loops
  forever using 100% CPU.

  ---- ----

  The following section is only if you wish to compile this binary from
  source, otherwise you can ignore it.

  First compile OCaml from:

  https://github.com/ocaml/ocaml

  (note you have to compile it on aarch64 or in qemu, it's not possible
  to cross-compile).  You will have to apply the one-line patch from:

  https://sympa.inria.fr/sympa/arc/caml-list/2013-12/msg00179.html

      ./configure
      make -j1 world.opt

  Then do:

      echo 'print_endline "hello, world"' > test.ml
      ./boot/ocamlrun ./ocamlopt -I stdlib stdlib.cmxa test.ml -o test
      ./test

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