asm

asmtool

tool to help with putting asm in cleo scripts

Example usage

Let's say you want to hook on this call

.text:005869BF     call    _?paintMapZones

so you put 005869C0 in the bottom right small box and tick 'jump'

Then you come up with this genius code:

call 0x586650 ; _?paintMapZones 0x586650 ; make the call that got rewritten

; do something
push 0
call 0x56E210 ; CPed *__cdecl getPlayerPed(int number)
mov [_var01], eax ; save the ped to some var
add esp, 0x4
; more code and awesome stuff

jmp 0x5869C4 ; back to business, continue right after the hooked call

Press the 'Do it all' button (after you made sure the gcc & objdump paths are correct, duh) and magic code appears:

:HOOKER
0AC6: 0@ = label @ENTRY offset

0085: 1@ = 0@ // (int)
000E: 1@ -= 0x005869c4
0A8C: write_memory 0x005869bf size 1 value 0xE9 vp 0
0A8C: write_memory 0x005869C0 size 4 value 1@ vp 0

0AC6: 1@ = label @ENTRY offset

000A: 1@ += 1
0A8D: 2@ = read_memory 1@ size 4 vp 0
0062: 2@ -= 0@  // (int)
0A8C: write_memory 1@ size 4 value 2@ vp 0
000A: 1@ += 7
0A8D: 2@ = read_memory 1@ size 4 vp 0
0062: 2@ -= 0@  // (int)
0A8C: write_memory 1@ size 4 value 2@ vp 0
000A: 1@ += 5
0AC6: 3@ = label @DATA01 offset
0A8C: write_memory 1@ size 4 value 3@ vp 0
000A: 1@ += 8
0A8D: 2@ = read_memory 1@ size 4 vp 0
0062: 2@ -= 0@  // (int)
0A8C: write_memory 1@ size 4 value 2@ vp 0

0002: jump @NOMOREHOOKER


:ENTRY
hex
e8
4b 66 58 00 
6a 00 
e8
04 e2 56 00 
a3 
00 00 00 00 // DATA01
83 c4 04 
e9
ab 69 58 00 
90 
90 
90 
end

So put this somewhere and jump to @HOOKER to hook the stuff and it will return to :NOMOREHOOKER when it's done hooking da hook. Also reserve some bytes for the _var01:

:DATA01
hex
00 00 00 00
end

Command line usage

It's also possible to call this program with an input file as single argument. Then you must specify options in that input file as comments (can be anywhere in that file):

; _ASM_HOOKADDR: 0058EAF1
; _ASM_JUMP: true
; _ASM_CORRECT_OFFSETS: true
; _ASM_COMMENTS: false
; _ASM_GCC: S:\broftware\perl\c\bin\gcc.exe
; _ASM_OBJDUMP: S:\broftware\perl\c\bin\objdump.exe
; _ASM_TARGETFILE: plnewhud-asm.txt
; _ASM_PREPROCONLY: false
; _ASM_LF: true

Not all options are required.

If some error happend, the gui will pop open with the error message.

Preprocessor

It is also possible to do some preprocessor-like replacements:

; _DEFINE:mem_addr=0x719510

This will literal replace mem_addr to 0x71951. Note that is tries to not replace things that should not be replaced; e.g. some_mem_addr will not be replaced to some_0x71951.

Use ; _ASM_PREPROCONLY: true to only let the preprocessor run (also applies when using the gui).

Predefined constants

• __BASEADDR will point to the address where the script is placed

Multiple files

; _ASM_INCLUDE: otherfile.asm

Can be relative, can be absolute, can have any extension.

Caveats

• things like mov edx, [eax+_var03] won't work
• same with mov edx, [edi*4+__BASEOFFSET+somelabel]

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this was used for gps and plhud and stuff