[Qemu-devel] [PATCH v2 0/3] target-m68k: add movem, BCD and CAS instructions

[Laurent Vivier <laurent@vivier.eu>]

This series is another subset of the series I sent in May:
https://lists.gnu.org/archive/html/qemu-devel/2016-05/msg00501.html

This subset contains reworked patches for:
- abcd/nbcd/sbcd: remove inline, delay write back to memory and
  use only 3 digits (and extract it from the bifield patch as
  it was squashed into it)
- movem: delay the update of the registers to the end of the load
  sequence to be able to restart the operation in case of page
  fault, and manage the 68020+ <-> 68000/68010 special case
- cas/cas2: rewrite according Richard's comments,
  and use cmpxchg() in cas.

I've checked it doesn't break coldfire support:
http://wiki.qemu.org/download/coldfire-test-0.1.tar.bz2
but it can't boot a 680x0 processor kernel.

v2:
- movem: don't use temp variable mask2
- bcd: delay register write back
       fix bcd_add() to add X
       define bcd_sub() instead of bsd_neg()
- cas2: make it atomic with "parallel_cpus" and
        cpu_loop_exit_atomic() (and 64bit cmpxchg()
        if possible)

Richard: This series doesn't use your "areg writeback" series,
but if you resend your series (with cmpm patches squashed
and the fix for writeback_mask), I will rebase this series
on top of yours.

Thanks,
Laurent

Laurent Vivier (3):
  target-m68k: add abcd/sbcd/nbcd
  target-m68k: implement 680x0 movem
  target-m68k: add cas/cas2 ops

 target-m68k/helper.h    |   2 +
 target-m68k/op_helper.c | 133 +++++++++++++
 target-m68k/translate.c | 481 ++++++++++++++++++++++++++++++++++++++++++++++--
 3 files changed, 599 insertions(+), 17 deletions(-)

-- 
2.7.4