init

x86_64/Example_Code/byte_placement_rax.asm

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+; shellcode-lab64bit
+; dash@hack4.org
+; byte placements on 64 bit - example
+BITS 64
+global _start
+
+_start:
+
+; former general purpose register, example
+; sub is used to clear out the register
+sub rax, rax
+
+mov	rax, 0x4142434445464748
+sub rax, rax
+
+mov eax, 0x41424344
+sub eax, eax
+
+; address 16bit
+mov ax, 0x4142
+
+; overwrite the higher byte of ax
+; 0x4142 gets to 0x2d42
+mov ah,0x2d
+sub ah, ah
+
+mov al,0x41
+sub al, al