tree 758ab90e0745405eb8919b80858eda503bce0b83
parent 6105c4f8e47f9e11e11ac625500caa09b02d91a7
author Bryan O'Donoghue <bryan.odonoghue@linaro.org> 1552318567 +0000
committer Bryan O'Donoghue <bryan.odonoghue@linaro.org> 1552471701 +0000

bl2-el3: Fix exit to bl32 by ensuring a more complete write to SPSR

Prior to entry into BL32 we set the SPSR by way of msr spsr, r1.
This unfortunately only writes the bits f->[31:24] and c->[7:0].

This patch updates the bl2 exit path to write the x->[15:8] and c->[7:0]
fields of the SPSR. For the purposes of initial setup of the SPSR the x and
c fields should be sufficient and importantly will capture the necessary
lower-order control bits that f:c alone do not.

This is important to do to ensure the SPSR is set to the mode the platform
intends prior to performing an eret.

Fixes: b1d27b484f41 ("bl2-el3: Add BL2_EL3 image")

Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>