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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
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1 changed files with 2 additions and 1 deletions
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@ -99,7 +99,8 @@ static int gpr_set(struct task_struct *target,
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if (ret)
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if (ret)
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return ret;
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return ret;
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regs.sr = task_pt_regs(target)->sr;
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/* BIT(0) of regs.sr is Condition Code/Carry bit */
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regs.sr = (regs.sr & BIT(0)) | (task_pt_regs(target)->sr & ~BIT(0));
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#ifdef CONFIG_CPU_HAS_HILO
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#ifdef CONFIG_CPU_HAS_HILO
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regs.dcsr = task_pt_regs(target)->dcsr;
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regs.dcsr = task_pt_regs(target)->dcsr;
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#endif
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#endif
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