QEMU With E2K User Support
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Mark Cave-Ayland a9431a03f7 target/m68k: add M68K_FEATURE_UNALIGNED_DATA feature
According to the M68040UM Appendix D the requirement for data accesses to be
word aligned is only for the 68000, 68008 and 68010 CPUs. Later CPUs from the
68020 onwards will allow unaligned data accesses but at the cost of being less
efficient.

Add a new M68K_FEATURE_UNALIGNED_DATA feature to specify that data accesses are
not required to be word aligned, and don't perform the alignment on the stack
pointer when taking an exception if this feature is not selected.

This is required because the MacOS DAFB driver attempts to call an A-trap
with a byte-aligned stack pointer during initialisation and without this the
stack pointer is off by one when the A-trap returns.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20210308121155.2476-4-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
2021-03-11 21:12:32 +01:00
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.gitlab-ci.d docker: OpenSBI build job depends on OpenSBI container 2021-03-09 06:03:53 +01:00
accel * Add some missing gitlab-CI job dependencies 2021-03-10 17:22:45 +00:00
audio
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backends hostmem: Don't report pmem attribute if unsupported 2021-02-18 18:34:47 -05:00
block nbd patches for 2021-03-09 2021-03-11 13:57:08 +00:00
bsd-user
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chardev chardev: add nodelay option 2021-03-06 11:41:54 +01:00
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disas
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meson@776acd2a80
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nbd nbd: server: Report holes for raw images 2021-03-08 13:08:45 -06:00
net qtest: delete superfluous inclusions of qtest.h 2021-03-09 06:03:53 +01:00
pc-bios roms/opensbi: Upgrade from v0.8 to v0.9 2021-03-04 09:43:29 -05:00
plugins
po
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qapi qapi: Remove QMP events and commands from user-mode builds 2021-03-05 15:40:49 +01:00
qga * fix tracing vs -daemonize (Daniel) 2021-03-08 13:51:41 +00:00
qobject
qom qom: Check for wellformed id in user_creatable_add_type() 2021-03-06 11:41:54 +01:00
replay
roms roms/opensbi: Upgrade from v0.8 to v0.9 2021-03-04 09:43:29 -05:00
scripts scripts/ci/gitlab-pipeline-status: give more info when pipeline not found 2021-03-09 06:03:53 +01:00
scsi scsi: inline sg_io_sense_from_errno() into the callers. 2021-03-06 11:42:56 +01:00
semihosting semihosting: Move hw/semihosting/ -> semihosting/ 2021-03-10 15:34:12 +00:00
slirp@8f43a99191
softmmu Testing, guest-loader and other misc tweaks 2021-03-11 16:20:58 +00:00
storage-daemon qemu-storage-daemon: add --pidfile option 2021-03-08 14:55:18 +01:00
stubs semihosting: Move include/hw/semihosting/ -> include/semihosting/ 2021-03-10 15:34:12 +00:00
subprojects/libvhost-user
target target/m68k: add M68K_FEATURE_UNALIGNED_DATA feature 2021-03-11 21:12:32 +01:00
tcg tcg/tci: Merge mov, not and neg operations 2021-03-06 11:45:21 -08:00
tests Testing, guest-loader and other misc tweaks 2021-03-11 16:20:58 +00:00
tools virtiofs: drop remapped security.capability xattr as needed 2021-03-04 10:26:16 +00:00
trace trace: fix "-trace file=..." 2021-03-06 11:42:57 +01:00
ui ui/console: Pass placeholder surface to displays 2021-03-04 09:35:36 +01:00
util nbd patches for 2021-03-09 2021-03-11 13:57:08 +00:00
.cirrus.yml
.dir-locals.el
.editorconfig .editorconfig: update the automatic mode setting for Emacs 2021-03-10 15:34:11 +00:00
.exrc
.gdbinit
.gitattributes
.gitignore
.gitlab-ci.yml Testing, guest-loader and other misc tweaks 2021-03-11 16:20:58 +00:00
.gitmodules
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.patchew.yml
.readthedocs.yml
.travis.yml travis.yml: Limit simultaneous jobs to 3 2021-02-19 06:31:40 +01:00
block.c nbd patches for 2021-03-09 2021-03-11 13:57:08 +00:00
blockdev-nbd.c
blockdev.c nbd patches for 2021-03-09 2021-03-11 13:57:08 +00:00
blockjob.c nbd patches for 2021-03-09 2021-03-11 13:57:08 +00:00
configure Remove deprecated target tilegx 2021-03-09 11:26:32 +01:00
COPYING
COPYING.LIB
cpu.c
cpus-common.c
disas.c
exec-vary.c
gdbstub.c semihosting: Move include/hw/semihosting/ -> include/semihosting/ 2021-03-10 15:34:12 +00:00
gitdm.config
hmp-commands-info.hx
hmp-commands.hx
iothread.c
job-qmp.c
job.c
Kconfig semihosting: Move hw/semihosting/ -> semihosting/ 2021-03-10 15:34:12 +00:00
Kconfig.host
LICENSE
MAINTAINERS Testing, guest-loader and other misc tweaks 2021-03-11 16:20:58 +00:00
Makefile build-sys: invoke ninja with -d keepdepfile 2021-03-06 11:42:57 +01:00
memory_ldst.c.inc
meson_options.txt multiprocess: move feature to meson_options.txt 2021-02-25 14:14:32 +01:00
meson.build semihosting: Move hw/semihosting/ -> semihosting/ 2021-03-10 15:34:12 +00:00
module-common.c
os-posix.c
os-win32.c
qemu-bridge-helper.c
qemu-edid.c
qemu-img-cmds.hx
qemu-img.c
qemu-io-cmds.c
qemu-io.c
qemu-keymap.c
qemu-nbd.c
qemu-options-wrapper.h
qemu-options.h
qemu-options.hx chardev: add nodelay option 2021-03-06 11:41:54 +01:00
qemu.nsi
qemu.sasl
README.rst docs: move CODING_STYLE into the developer documentation 2021-02-24 11:05:21 +00:00
replication.c
replication.h
thunk.c
trace-events
VERSION
version.rc

===========
QEMU README
===========

QEMU is a generic and open source machine & userspace emulator and
virtualizer.

QEMU is capable of emulating a complete machine in software without any
need for hardware virtualization support. By using dynamic translation,
it achieves very good performance. QEMU can also integrate with the Xen
and KVM hypervisors to provide emulated hardware while allowing the
hypervisor to manage the CPU. With hypervisor support, QEMU can achieve
near native performance for CPUs. When QEMU emulates CPUs directly it is
capable of running operating systems made for one machine (e.g. an ARMv7
board) on a different machine (e.g. an x86_64 PC board).

QEMU is also capable of providing userspace API virtualization for Linux
and BSD kernel interfaces. This allows binaries compiled against one
architecture ABI (e.g. the Linux PPC64 ABI) to be run on a host using a
different architecture ABI (e.g. the Linux x86_64 ABI). This does not
involve any hardware emulation, simply CPU and syscall emulation.

QEMU aims to fit into a variety of use cases. It can be invoked directly
by users wishing to have full control over its behaviour and settings.
It also aims to facilitate integration into higher level management
layers, by providing a stable command line interface and monitor API.
It is commonly invoked indirectly via the libvirt library when using
open source applications such as oVirt, OpenStack and virt-manager.

QEMU as a whole is released under the GNU General Public License,
version 2. For full licensing details, consult the LICENSE file.


Building
========

QEMU is multi-platform software intended to be buildable on all modern
Linux platforms, OS-X, Win32 (via the Mingw64 toolchain) and a variety
of other UNIX targets. The simple steps to build QEMU are:


.. code-block:: shell

  mkdir build
  cd build
  ../configure
  make

Additional information can also be found online via the QEMU website:

* `<https://qemu.org/Hosts/Linux>`_
* `<https://qemu.org/Hosts/Mac>`_
* `<https://qemu.org/Hosts/W32>`_


Submitting patches
==================

The QEMU source code is maintained under the GIT version control system.

.. code-block:: shell

   git clone https://gitlab.com/qemu-project/qemu.git

When submitting patches, one common approach is to use 'git
format-patch' and/or 'git send-email' to format & send the mail to the
qemu-devel@nongnu.org mailing list. All patches submitted must contain
a 'Signed-off-by' line from the author. Patches should follow the
guidelines set out in the `style section
<https://www.qemu.org/docs/master/devel/style.html>` of
the Developers Guide.

Additional information on submitting patches can be found online via
the QEMU website

* `<https://qemu.org/Contribute/SubmitAPatch>`_
* `<https://qemu.org/Contribute/TrivialPatches>`_

The QEMU website is also maintained under source control.

.. code-block:: shell

  git clone https://gitlab.com/qemu-project/qemu-web.git

* `<https://www.qemu.org/2017/02/04/the-new-qemu-website-is-up/>`_

A 'git-publish' utility was created to make above process less
cumbersome, and is highly recommended for making regular contributions,
or even just for sending consecutive patch series revisions. It also
requires a working 'git send-email' setup, and by default doesn't
automate everything, so you may want to go through the above steps
manually for once.

For installation instructions, please go to

*  `<https://github.com/stefanha/git-publish>`_

The workflow with 'git-publish' is:

.. code-block:: shell

  $ git checkout master -b my-feature
  $ # work on new commits, add your 'Signed-off-by' lines to each
  $ git publish

Your patch series will be sent and tagged as my-feature-v1 if you need to refer
back to it in the future.

Sending v2:

.. code-block:: shell

  $ git checkout my-feature # same topic branch
  $ # making changes to the commits (using 'git rebase', for example)
  $ git publish

Your patch series will be sent with 'v2' tag in the subject and the git tip
will be tagged as my-feature-v2.

Bug reporting
=============

The QEMU project uses Launchpad as its primary upstream bug tracker. Bugs
found when running code built from QEMU git or upstream released sources
should be reported via:

* `<https://bugs.launchpad.net/qemu/>`_

If using QEMU via an operating system vendor pre-built binary package, it
is preferable to report bugs to the vendor's own bug tracker first. If
the bug is also known to affect latest upstream code, it can also be
reported via launchpad.

For additional information on bug reporting consult:

* `<https://qemu.org/Contribute/ReportABug>`_


ChangeLog
=========

For version history and release notes, please visit
`<https://wiki.qemu.org/ChangeLog/>`_ or look at the git history for
more detailed information.


Contact
=======

The QEMU community can be contacted in a number of ways, with the two
main methods being email and IRC

* `<mailto:qemu-devel@nongnu.org>`_
* `<https://lists.nongnu.org/mailman/listinfo/qemu-devel>`_
* #qemu on irc.oftc.net

Information on additional methods of contacting the community can be
found online via the QEMU website:

* `<https://qemu.org/Contribute/StartHere>`_