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#define user_mode(regs) (!((regs)->tstate & TSTATE_PRIV))
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#define instruction_pointer(regs) ((regs)->tpc)
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#define user_stack_pointer(regs) ((regs)->u_regs[UREG_FP])
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#define regs_return_value(regs) ((regs)->u_regs[UREG_I0])