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Re: [Qemu-devel] [PATCH v2 0/7] Unify and QOMify (target|monitor)_disas

From: Peter Crosthwaite
Subject: Re: [Qemu-devel] [PATCH v2 0/7] Unify and QOMify (target|monitor)_disas
Date: Thu, 14 May 2015 21:52:40 -0700


Richard has RB'd the core stuff but do we need CPU arch maintainer
acks on the latter patches?

What queue should this go via? TCG?


On Sat, May 9, 2015 at 1:11 PM, Peter Crosthwaite
<address@hidden> wrote:
> These two functions are mostly trying to do the same thing, which is
> disassemble a target instruction (sequence) for printfing. The
> architecture specific setup is largely duped between the two functions.
> The approach is to add a single QOM hook on the CPU level to setup the
> disassembler (P1&2). The two stage flags system is removed. That is,
> the old scheme, is for the translate/montitor code to pass in flags
> that disas.c then interprets. Instead the entire job of setting up arch
> specifics is outsourced to target-specific code (via the new QOM hook)
> removing the need for the flags system. Both monitor_disas and
> target_disas then calls this singly defined hook if it is available.
> Three architectures (microblaze, cris and ARM) are patched
> to use the new QOMification and at the same time, make the
> monitor_disas consistent with target_disas. The #if defined TARGET_FOO
> for each is removed from disas.c (bringing us closer to the exciting
> goal of no #ifdef TARGET_FOO in system mode code).
> Microblaze is trivial, the target_disas setup is directly applicable
> to monitor_disas to bring in microblaze monitor disas support (P5).
> Cris had a small hiccup, a patch is needed to handle monitor_disas's
> 0 buffer length (P6). Then cris is patched to enable monitor disas
> in same way as microblaze (P7).
> ARM is the harder. The vixl A64 disas was hardcoded to fprintf with
> a statically inited output stream (matching target_disas). The vixl
> printfery is patched to be runtime variable (P3). P4 brings
> ARM monitor disassembly online (via using the target_disas
> implementation as the QOMified implementation).
> Changed since v1 (RTH review):
> Use QOMified approach.
> Remove flags system.
> Limit scope to only the 3 converted arches
> Addressed comments on CPP constructor changes
> Peter Crosthwaite (7):
>   disas: Add print_insn to disassemble info
>   disas: QOMify target specific setup
>   disas: arm-a64: Make printfer and stream variable
>   disas: arm: QOMify target specific disas setup
>   disas: microblaze: QOMify target specific disas setup
>   disas: cris: Fix 0 buffer length case
>   disas: cris: QOMify target specific disas setup
>  disas.c                 | 121 
> ++++++++++++++++++------------------------------
>  disas/arm-a64.cc        |  25 ++++++++--
>  disas/cris.c            |   6 +--
>  include/disas/bfd.h     |   6 +++
>  include/qom/cpu.h       |   4 ++
>  target-arm/cpu.c        |  35 ++++++++++++++
>  target-cris/cpu.c       |  16 +++++++
>  target-microblaze/cpu.c |   8 ++++
>  8 files changed, 138 insertions(+), 83 deletions(-)
> --
> 1.9.1

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