assembly - X86_64 AT&T How to put one ascii letter(1byte) at the end of the text placed in register -


i need open text file. have filename in register , need add '\0' (0x00 in hex) @ end.

my register rcx contains name: e.txt , can check in gdb , presents correctly :

rcx: 0x7478742e65

there name in ascii code. i'd put '00' after , should that:

rcx: 0x007478742e65

i using assembler x86_64bit at&t


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