init

x86_64/Example_Code/clear_register.asm

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+; shellcode-lab64 
+; dash@hack4.org
+;
+
+; some example to zero-out a register
+BITS 64
+global _start
+_start:
+
+xor rax, rax	; initial clearing - classic xor
+mov rax, 0xDEADBEEF
+sub rax, rax    ; sub opcode
+
+mov rax, 0xF00DBABE
+xor rax, rax	; classic xor
+
+; check value of register and add or sub from that
+; let's assume 29A is in the register rcx
+sub rcx, rcx
+mov rcx, 0x29A
+sub rcx, 666 
+; zero'd