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function _stp_bpf_syscall_get_nr:long(regs:long)
{
  return @choose_defined( @cast(regs, "struct pt_regs", "kernel")->orig_ax, // STAPCONF_X86_UNIREGS
          @choose_defined(@cast(regs, "struct pt_regs", "kernel")->orig_rax, // __x86_64__
	    @choose_defined(@cast(regs, "struct pt_regs", "kernel")->orig_eax, // __i386__
	      @choose_defined(@cast(regs, "struct pt_regs", "kernel")->ARM_r7, // __arm__
                @choose_defined(@cast(regs, "struct pt_regs", "kernel")->regs[2], //__mips__
                  @choose_defined(@cast(regs, "struct pt_regs", "kernel")->gpr[0], //__powerpc__
                    @choose_defined(@cast(regs, "struct pt_regs", "kernel")->gprs[2], // __s390__ || __s390x__
                      @choose_defined(@cast(regs, "struct pt_regs", "kernel")->syscallno, // __aarch64__
		                        @cast(regs, "struct pt_regs", "kernel")->a7)))))))); // __riscv__
}