powerpc/64: Fix booting large kernels with STRICT_KERNEL_RWX

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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: 1e0fc9d1eb ("powerpc/Kconfig: Enable STRICT_KERNEL_RWX for some configs")
Signed-off-by: Russell Currey <ruscur@russell.cc>
[mpe: Fix it to work on BE by using DOTSYM()]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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Russell Currey 2019-03-27 14:35:54 +11:00 • committed by Michael Ellerman

parent 62611c1e24

commit 56c46bba9b

1 changed files with 3 additions and 1 deletions

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arch/powerpc/kernel/head_64.S

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