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From: Avi Kivity <avi@redhat.com>
To: Guillaume Thouvenin <guillaume.thouvenin@ext.bull.net>
Cc: kvm <kvm@vger.kernel.org>
Subject: Re: [Patch 4/5] x86_emulator: add the assembler code for three operands
Date: Wed, 26 Nov 2008 14:50:22 +0200	[thread overview]
Message-ID: <492D460E.10900@redhat.com> (raw)
In-Reply-To: <20081126125908.1eb177d1@frecb000711>

Guillaume Thouvenin wrote:
> It's the only code with shld instruction. I don't see how you can have
> three different shld instructions here. I'm sure that I'm missing
> something here because for me, when we emulate the shld instruction, the
> code produced is the same. I mean that src.val and dst.val are always
> unsigned long and I don't see why register size are important here. In
> fact I don't understand why we need to use the switch ((_dst).bytes)
> for the other emulations.
>   

The flags vary according to operand size.  For example, shld $1, %bx, 
%ax where %ax == 0x8000 will set eflags.cf, but shld $1, %ebx, %eax , 
with the same arguments, will not.

-- 
error compiling committee.c: too many arguments to function


  reply	other threads:[~2008-11-26 12:51 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-11-03 15:00 [RFC Patch 0/5] x86_emulator: emulate shld and shrd instruction Guillaume Thouvenin
2008-11-03 15:01 ` [Patch 1/5] x86_emulator: Extend the opcode descriptor Guillaume Thouvenin
2008-11-03 15:02 ` [Patch 2/5] x86_emulator: add Src2 decode set Guillaume Thouvenin
2008-11-03 15:03 ` [Patch 3/5] x86_emulator: add a new "implied 1" Src decode type Guillaume Thouvenin
2008-11-03 15:04 ` [Patch 5/5] x86_emulator: add the emulation of shld and shrd instructions Guillaume Thouvenin
2008-11-03 15:05 ` [Patch 4/5] x86_emulator: add the assembler code for three operands Guillaume Thouvenin
2008-11-04 10:21   ` Avi Kivity
2008-11-25  7:59     ` Guillaume Thouvenin
2008-11-25 14:59       ` Avi Kivity
2008-11-26 11:59         ` Guillaume Thouvenin
2008-11-26 12:50           ` Avi Kivity [this message]
2008-12-03 15:00         ` Guillaume Thouvenin
2008-11-04 10:23 ` [RFC Patch 0/5] x86_emulator: emulate shld and shrd instruction Avi Kivity
  -- strict thread matches above, loose matches on Subject: below --
2008-12-04 13:24 [Patch 0/5] x86_emulator: emulate shld and shrd instructions Guillaume Thouvenin
2008-12-04 13:29 ` [Patch 4/5] x86_emulator: add the assembler code for three operands Guillaume Thouvenin

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