ptrace_write_regs
ret = ptrace_write_regs(pid, NT_PPC_PKEY, &info->amr2, 1);
ret = ptrace_write_regs(pid, NT_PPC_PKEY, &info->invalid_amr, 1);
ret = ptrace_write_regs(pid, NT_PPC_PKEY, regs, 2);
ret = ptrace_write_regs(pid, NT_PPC_PKEY, regs, 3);