[PATCH] Make instruction dumping work in real mode.
scottwood at freescale.com
Tue Sep 25 05:01:00 EST 2007
On non-book-E, if a faulting PC is in the first few pages, and it's not an
ITLB miss, it's likely executing in real mode, probably at an exception vector.
Rather than print a useless XXXXXXXX, it is assumed that this is the case, and
the address is treated as physical. This helps when debugging corruption at
the beginning of memory.
Signed-off-by: Scott Wood <scottwood at freescale.com>
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..7cb94d7 100644
@@ -354,6 +354,14 @@ static void show_instructions(struct pt_regs *regs)
if (!(i % 8))
+ /* If the address is in the first couple pages, it's
+ * likely executing in real mode.
+ if (regs->nip < 0x4000)
+ pc += (unsigned long)phys_to_virt(KERNELBASE);
/* 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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