tree 547070f51d04d1f96e77453ae25aff876545c38a
parent ff4dc353a38ed5c775189c8500c735fbf7e37ad6
author Yann Gautier <yann.gautier@st.com> 1580208338 +0100
committer Yann Gautier <yann.gautier@st.com> 1582295558 +0100

el3_entrypoint_common: avoid overwriting arg3

At each BL entry point, the registers r9 to r12 are used to save info from
the previous BL parameters put in r0 to r3. But zeromem uses r12, leading
to a corruption of arg3. Therefore this change copies r12 to r7 before
zeromem() call and restores r12 afterwards. It may be better to save it
in r7 in el3_arch_init_common and not at the entrypoint as r7 could be used
in other functions, especially platform ones.
This is a fix for Task T661.

Change-Id: Icc11990c69b5d4c542d08aca1a77b1f754b61a53
Signed-off-by: Yann Gautier <yann.gautier@st.com>