[英]Loop in assembly doesn't work
I had some problems when I tried to create a loop in asm. 当我尝试在asm中创建循环时遇到了一些问题。 So I created another code with just the loop.
所以我用循环创建了另一个代码。 The problem is, when I decrement or increment the
ecx
, the variable gets messed. 问题是,当我减少或增加
ecx
,变量会变得混乱。 If I use the loop instruction without the dec it doesn't work either. 如果我使用没有dec的循环指令它也不起作用。 How do I use the
ecx
to loop? 我如何使用
ecx
循环?
Code 码
section .text
global main
extern printf
section .data
FORMAT: db "L", 10, 0 ; just to print the L 10 times
main:
mov ecx, 10 ; start the counter in 10
jmp runloop ; i imagine i dont need it
runloop:
push FORMAT
call printf
add esp, 4
dec ecx
cmp ecx, 0
jne runloop
ecx
value is not guaranteed to be preserved across the printf
call. 不保证在
printf
调用中保留ecx
值。 Use one of the following registers instead: ebx
, ebp
, esi
, edi
. 请改用以下寄存器之一:
ebx
, ebp
, esi
, edi
。 You should preserve them too by push
ing the register of choise onto the stack and restoring it afterwards. 您应该通过
push
选择寄存器push
堆栈并在之后恢复它来保留它们。
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