[PATCH v2] Make instruction dumping work in real mode.
scottwood at freescale.com
Wed Sep 26 06:19:35 EST 2007
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
Signed-off-by: Scott Wood <scottwood at freescale.com>
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
@@ -354,6 +354,14 @@ static void show_instructions(struct pt_regs *regs)
if (!(i % 8))
+#if !defined(CONFIG_BOOKE) && !defined(CONFIG_40x)
+ /* If executing with the IMMU off, adjust pc rather
+ * than print XXXXXXXX.
+ if (!(regs->msr & MSR_IR))
+ pc = (unsigned long)phys_to_virt(pc);
/* We use __get_user here *only* to avoid an OOPS on a
* bad address because the pc *should* only be a
* kernel address.
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