tree c5b666b8621b9dc53d47ce9a25a62cd83844b570
parent eb20f04ef362d13fe6c230f308783bb1a9fa7b77
author Bryan O'Donoghue <bryan.odonoghue@linaro.org> 1552392591 +0000
committer Bryan O'Donoghue <bryan.odonoghue@linaro.org> 1552471730 +0000

bl1-smc-handler: Ensure the lower-order 16 bits of SPSR are programmed

A bug recently fixed in bl2/aarch32/bl2_el3_entrypoint.S relates to
programming the lower-order 16 bits of the SPSR to populate into the CPSR
on eret.

The BL1 smc-handler code is identical and has the same shortfall in
programming the SPSR from the platform defined struct
entry_point_info->spsr.

msr spsr, r1 will only update bits f->[31:24] and c->[7:0] respectively. In
order to ensure the 16 lower-order processor mode bits x->[15:8] and
c->[7:0] this patch changes msr spsr, r1 to msr spsr_xc, r1.

This change ensures we capture the x field, which we are interested in and
not the f field which we are not.

Fixes: f3b4914be3b4 ('AArch32: Add generic changes in BL1')

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