If you look at the 2011 x32 article you'll see that Linus asked the same question. From that article: "There are legitimate reasons why some of the system calls cannot be shared between the x32 and 64-bit modes. Situations where user space passes structures containing pointers to the kernel (ioctl() and readv() being simple examples) will require special handling since those pointers will be 32-bit. Signal handling will always be special.
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