tree 42259e29611ea2266daeedb158aae45af783ba85
parent fbd63c08cdcca5fb1315aca3172b3c9c272cfb4f
author Guo Ren <guoren@linux.alibaba.com> 1632468818 +0800
committer Guo Ren <guoren@linux.alibaba.com> 1634340012 +0800

csky: Fixup regs.sr broken in ptrace

gpr_get() return the entire pt_regs (include sr) to userspace, if we
don't restore the C bit in gpr_set, it may break the ALU result in
that context. So the C flag bit is part of gpr context, that's why
riscv totally remove the C bit in the ISA. That makes sr reg clear
from userspace to supervisor privilege.

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: stable@vger.kernel.org