Commit af89ebaa authored by Guo Ren's avatar Guo Ren
Browse files

csky: Fixup 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: default avatarGuo Ren <>
Cc: Al Viro <>
parent fbd63c08
......@@ -99,7 +99,8 @@ static int gpr_set(struct task_struct *target,
if (ret)
return ret; = task_pt_regs(target)->sr;
/* BIT(0) of is Condition Code/Carry bit */ = ( & BIT(0)) | (task_pt_regs(target)->sr & ~BIT(0));
regs.dcsr = task_pt_regs(target)->dcsr;
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