Push/Pop segmentation fault at Assembly x86

Question

I\'m using elf64 to compile my assembly x86 code: I\'ve this sub-routine:

printNumber:
    mov EAX, EDX ; EDX contain some value like \"35\"         


        

Answer 1

Shouldn't that be "PUSH EDX" instead of "PUSH RDX"? Or perhaps a PUSH dword ptr 0/PUSH EDX combo if you really need to push 64-bits? Wondering if maybe it ends up being unaligned and doesn't like it? Prior x86 modes don't care about alignment, but perhaps it does for x64 instructions?