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Subject[PATCH 4.20 069/183] powerpc/8xx: fix setting of pagetable for Abatron BDI debug tool.
4.20-stable review patch.  If anyone has any objections, please let me know.


[ Upstream commit fb0bdec51a4901b7dd088de0a1e365e1b9f5cd21 ]

Commit 8c8c10b90d88 ("powerpc/8xx: fix handling of early NULL pointer
dereference") moved the loading of r6 earlier in the code. As some
functions are called inbetween, r6 needs to be loaded again with the
address of swapper_pg_dir in order to set PTE pointers for
the Abatron BDI.

Fixes: 8c8c10b90d88 ("powerpc/8xx: fix handling of early NULL pointer dereference")
Signed-off-by: Christophe Leroy <>
Signed-off-by: Michael Ellerman <>
Signed-off-by: Sasha Levin <>
arch/powerpc/kernel/head_8xx.S | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S
index 3b67b9533c82f..438512759e827 100644
--- a/arch/powerpc/kernel/head_8xx.S
+++ b/arch/powerpc/kernel/head_8xx.S
@@ -927,11 +927,12 @@ start_here:

/* set up the PTE pointers for the Abatron bdiGDB.
- tovirt(r6,r6)
lis r5, abatron_pteptrs@h
ori r5, r5, abatron_pteptrs@l
stw r5, 0xf0(0) /* Must match your Abatron config file */
+ lis r6, swapper_pg_dir@h
+ ori r6, r6, swapper_pg_dir@l
stw r6, 0(r5)

/* Now turn on the MMU for real! */

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