Re: [Qemu-devel] sparc-softmmu uninitialized memory read?

["Andreas Färber" <afaerber@suse.de>]

Am 06.05.2012 21:27, schrieb malc:
> The attached patch is broken for non SysV calling conventions, would be
> nice if you could test things on Darwin (and, if your power5 box still has
> AIX, on AIX)

I replaced AIX 5.x with openSUSE, sorry. :)

> diff --git a/tcg/ppc/tcg-target.c b/tcg/ppc/tcg-target.c
> index dc40716..311af18 100644
> --- a/tcg/ppc/tcg-target.c
> +++ b/tcg/ppc/tcg-target.c
[...]
> @@ -810,6 +829,17 @@ static void tcg_out_qemu_st (TCGContext *s, const TCGArg *args, int opc)
>  #endif
>  
>      /* slow path */
> +#ifdef CONFIG_TCG_PASS_AREG0
> +    tcg_out_mov (s, TCG_TYPE_I32, 3, TCG_AREG0);
> +#if TARGET_LONG_BITS == 32
> +    tcg_out_mov (s, TCG_TYPE_I32, 4, addr_reg);
> +    ir = 5;
> +#else
> +    tcg_out_mov (s, TCG_TYPE_I32, 5, addr_reg2);
> +    tcg_out_mov (s, TCG_TYPE_I32, 6, addr_reg);

Here we should be using r4 + r5 for non-aligned targets. Alternative
patch sent that hopefully avoids such issues and the code duplication.

If you prefer two separate code paths for some reason, please at least
consider using a fool-proof alignment macro such as proposed.

/-F

> +    ir = 7;
> +#endif
> +#else
>  #if TARGET_LONG_BITS == 32
>      tcg_out_mov (s, TCG_TYPE_I32, 3, addr_reg);
>      ir = 4;
[snip]

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