[ Upstream commit 56c46bba9bbfe229b4472a5be313c44c5b714a39 ]
With STRICT_KERNEL_RWX enabled anything marked __init is placed at a 16M
boundary. This is necessary so that it can be repurposed later with
different permissions. However, in kernels with text larger than 16M,
this pushes early_setup past 32M, incapable of being reached by the
branch instruction.
Fix this by setting the CTR and branching there instead.
Fixes: 1e0fc9d1eb2b ("powerpc/Kconfig: Enable STRICT_KERNEL_RWX for some configs")
Signed-off-by: Russell Currey <ruscur@xxxxxxxxxx>
[mpe: Fix it to work on BE by using DOTSYM()]
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
arch/powerpc/kernel/head_64.S | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S
index ff8511d6d8ead..4f2e18266e34a 100644
--- a/arch/powerpc/kernel/head_64.S
+++ b/arch/powerpc/kernel/head_64.S
@@ -961,7 +961,9 @@ start_here_multiplatform:
/* Restore parameters passed from prom_init/kexec */
mr r3,r31
- bl early_setup /* also sets r13 and SPRG_PACA */
+ LOAD_REG_ADDR(r12, DOTSYM(early_setup))
+ mtctr r12
+ bctrl /* also sets r13 and SPRG_PACA */
LOAD_REG_ADDR(r3, start_here_common)
ld r4,PACAKMSR(r13)
--
2.20.1
