Page 1 of 1
Jump in Assembler
Posted: Sat Sep 30, 2017 10:50 pm
by MangaDrawing
Hi.
If we have for example this code:
cmp [ecx+08],1
je ???
cmp eax,eax
mov [ecx+14],(float)100
How can jump from "je" to "cmp eax,eax" or "mov [ecx+14],(float)100".Instead of "???" What should I write that jump to other lines?
Re: Jump in Assembler
Posted: Sat Sep 30, 2017 11:00 pm
by Bloodybone
you can directly manipulate the bytes at the je so je is in byte form 74 and then the second byte is how long you wan't to jump so if you wan't to jump to cmp eax,eax do 74 00 and if you wan't to jump to mov [ecx+14],(float)100 then do 74 01
Re: Jump in Assembler
Posted: Sat Sep 30, 2017 11:22 pm
by Bloodybone
Also if you wan't to jump in the Auto Assembler so if
cmp [ecx+08],1
je ???
cmp eax,eax
mov [ecx+14],(float)100
is your code you can add labels
Example:
Code: Select all
define(address,"Tutorial-i386.exe"+23B78)
define(bytes,8B 83 80 04 00 00)
[ENABLE]
assert(address,bytes)
alloc(newmem,$100)
label(code)
label(return)
label(jumpto)
newmem:
code:
cmp [ecx+08],1
je jumpto
cmp eax,eax
jmp return
jumpto:
mov [ecx+14],(float)100
jmp return
address:
jmp newmem
nop
return:
[DISABLE]
address:
db bytes
dealloc(newmem)