linux-kernel - Re: [2.6.30-rc8 KVM] gcc 3.3 dies at emulate_2op

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Date:	Sun, 07 Jun 2009 09:24:14 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
CC:	guillaume.thouvenin@....bull.net, linux-kernel@...r.kernel.org
Subject: Re: [2.6.30-rc8 KVM] gcc 3.3 dies at emulate_2op_cl().

Tetsuo Handa wrote:
> (Continued from http://lkml.org/lkml/2009/6/4/14 )
> I tried to identify the location of gcc 3.3's internal error using
> "make CONFIG_DEBUG_INFO=1 arch/x86/kvm/x86_emulate.s", and it turned out that
> the location is emulate_2op_cl().
>
> Commenting out like below solves the gcc's internal error.
>
> diff --git a/arch/x86/kvm/x86_emulate.c b/arch/x86/kvm/x86_emulate.c
> index ca91749..561b9b6 100644
> --- a/arch/x86/kvm/x86_emulate.c
> +++ b/arch/x86/kvm/x86_emulate.c
> @@ -2070,7 +2070,7 @@ twobyte_insn:
>                 break;
>         case 0xa4: /* shld imm8, r, r/m */
>         case 0xa5: /* shld cl, r, r/m */
> -               emulate_2op_cl("shld", c->src2, c->src, c->dst, ctxt->eflags);
> +               //emulate_2op_cl("shld", c->src2, c->src, c->dst, ctxt->eflags);
>                 break;
>         case 0xab:
>               bts:              /* bts */
> @@ -2080,7 +2080,7 @@ twobyte_insn:
>                 break;
>         case 0xac: /* shrd imm8, r, r/m */
>         case 0xad: /* shrd cl, r, r/m */
> -               emulate_2op_cl("shrd", c->src2, c->src, c->dst, ctxt->eflags);
> +               //emulate_2op_cl("shrd", c->src2, c->src, c->dst, ctxt->eflags);
>                 break;
>         case 0xae:              /* clflush */
>                 break;
>
> I think something is wrong with emulate_2op_cl() when compiled with gcc 3.3.5 .
>
>   

This is on i386, not x86_64, yes?

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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