On Sep 25, 2007, at 3:19 PM, Scott Wood wrote:
> On non-book-E-or-4xx, exceptions execute in real mode. If a fault
> happens
> that leads to a register dump, the kernel currently prints XXXXXXXX
> because
> it doesn't realize that PC is a physical address.
>
> This patch checks the state of the IMMU, and if necessary converts
> PC into a
> virtual address.
>
> Signed-off-by: Scott Wood <[EMAIL PROTECTED]>
> ---
> This version uses MSR_IR rather than address heuristics, and fixes
> breakage
> that somehow crept into the address adjustment in the previous patch.
>
> arch/powerpc/kernel/process.c | 8 ++++++++
> 1 files changed, 8 insertions(+), 0 deletions(-)
>
> diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/
> process.c
> index 57c589c..6dbde7f 100644
> --- a/arch/powerpc/kernel/process.c
> +++ b/arch/powerpc/kernel/process.c
> @@ -354,6 +354,14 @@ static void show_instructions(struct pt_regs
> *regs)
> if (!(i % 8))
> printk("\n");
>
> +#if !defined(CONFIG_BOOKE) && !defined(CONFIG_40x)
40x has a real mode and can have the IMMU off.
> + /* If executing with the IMMU off, adjust pc rather
> + * than print XXXXXXXX.
> + */
> + if (!(regs->msr & MSR_IR))
> + pc = (unsigned long)phys_to_virt(pc);
> +#endif
> +
> /* We use __get_user here *only* to avoid an OOPS on a
> * bad address because the pc *should* only be a
> * kernel address.
> --
> 1.5.3.1
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