Re: [Qemu-devel] [PATCH] sh7750: Fix crash when accessing PVR/PRR/CVR

["Andreas Färber" <afaerber@suse.de>]

Am 26.03.2013 13:20, schrieb Peter Maydell:
> Commit b350ab75 causes segfaults on accesses to PVR/PRR/CVR because
> it tries to call SUPERH_CPU_GET_CLASS() on a pointer that isn't a
> QOM object. Fix this by getting the actual QOM CPU object first.
> 
> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
> ---
> Tested with the r2d image/instructions from
> https://oss.renesas.com/modules/document/?Getting%20Started%20with%20SH4%20and%20QEMU

Oops, reproduces with the test image from the QEMU Wiki as well. Seems
to be a result of cherry-picking this commit before the full SH7750
QOM'ification.

Is this blocking any work of yours? Otherwise I would try rebasing my
SH7750 patches so that s->cpu becomes a SuperHCPU as expected here.
(Not sure if simply reverting my offending patch still works?)

Andreas

> 
>  hw/sh4/sh7750.c |    6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/hw/sh4/sh7750.c b/hw/sh4/sh7750.c
> index e4d37ad..3580c87 100644
> --- a/hw/sh4/sh7750.c
> +++ b/hw/sh4/sh7750.c
> @@ -289,13 +289,13 @@ static uint32_t sh7750_mem_readl(void *opaque, hwaddr addr)
>      case SH7750_CCR_A7:
>  	return s->ccr;
>      case 0x1f000030:		/* Processor version */
> -        scc = SUPERH_CPU_GET_CLASS(s->cpu);
> +        scc = SUPERH_CPU_GET_CLASS(ENV_GET_CPU(s->cpu));
>          return scc->pvr;
>      case 0x1f000040:		/* Cache version */
> -        scc = SUPERH_CPU_GET_CLASS(s->cpu);
> +        scc = SUPERH_CPU_GET_CLASS(ENV_GET_CPU(s->cpu));
>          return scc->cvr;
>      case 0x1f000044:		/* Processor revision */
> -        scc = SUPERH_CPU_GET_CLASS(s->cpu);
> +        scc = SUPERH_CPU_GET_CLASS(ENV_GET_CPU(s->cpu));
>          return scc->prr;
>      default:
>  	error_access("long read", addr);
> 


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