tree 58ef47a874006860056e4393224ac111ef25571d
parent 01558e25eddbded90c04c3027585c105877be332
author Lukas Auer <lukas.auer@aisec.fraunhofer.de> 1552847316 +0100
committer Andes <uboot@andestech.com> 1554687866 +0800

riscv: save hart ID in register tp instead of s0

The hart ID passed by the previous boot stage is currently stored in
register s0. If we divert the control flow inside a function, which is
required as part of multi-hart support, the function epilog may not be
called, clobbering register s0. Save the hart ID in the unallocatable
register tp instead to protect the hart ID.

Signed-off-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Rick Chen <rick@andestech.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>