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some comment for 0x00

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Jan-Erik Rediger 2023-09-15 11:55:12 +00:00
parent 8a4bc9cf6c
commit e42b567df7
1 changed files with 10 additions and 8 deletions
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18
0x00.asm
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@ -2,15 +2,17 @@
SECTION .text SECTION .text
global main global main
; all the different ways to set registers to 0.
main: main:
xor eax, eax xor eax, eax ; xor with itself
lea rbx, [0] lea rbx, [0] ; load effective address into rbx
; ecx usually starts with a high value, loop decrements this ; ecx usually starts with a high value, loop decrements this
; so this makes it all a bit faster ; so this makes it all a bit faster
mov ecx, 10 mov ecx, 10
loop $ loop $ ; loop until ecx hits 0. `$` is this instruction.
mov rdx, 0 mov rdx, 0 ; move 0 into rdx
and esi, 0 and esi, 0 ; bitwise-and esi with 0
sub edi, edi sub edi, edi ; substract from itself
push 0 push 0 ; put 0 on the stack
pop rbp pop rbp ; pop stack into rbp