Could be represented by this
xor eax, eax
Which have lower level cpu OpCodes of these values
leave # 0xC9
xor eax, eax # 0x31, 0xc0
ret # 0xC9
Which means if you wanted to create a shellcode of the 'return 0' statement in C you'd do the following.
unsigned char shellcode = "\xc9\x31\xc0\xc9";
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