https://github.com/torvalds/linux
Revision af89ebaa64de726ca0a39bbb0bf0c81a1f43ad50 authored by Guo Ren on 24 September 2021, 07:33:38 UTC, committed by Guo Ren on 15 October 2021, 23:20:12 UTC
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
1 parent fbd63c0
History
Tip revision: af89ebaa64de726ca0a39bbb0bf0c81a1f43ad50 authored by Guo Ren on 24 September 2021, 07:33:38 UTC
csky: Fixup regs.sr broken in ptrace
Tip revision: af89eba
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