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Relative pointer with index multiplier issue

 
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sbryzl
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PostPosted: Thu Jan 25, 2018 2:22 pm    Post subject: Relative pointer with index multiplier issue Reply with quote

Auto assembler seems to require an operand with multiplier at the end of the instruction except it will disassemble it with the multiplier at the beginning. No big deal if it's only one instruction to fix but if there is a large disassembly with a lot of these types of instructions it would be a lot of fixing.

The commented lines are the disassembly output. AA will give an error if you try to assign them to a table as they are.

Code:
[ENABLE]
alloc(CEmem,$1000)
registersymbol(CEmem)

define(game,cheatengine-x86_64.exe)

CEmem:
  fld [game+rax*2]
  cmp [game+rax*8],1
//  fld dword ptr [rax*2+cheatengine-x86_64.exe]
//  cmp dword ptr [rax*8+cheatengine-x86_64.exe],01



[DISABLE]
dealloc(CEmem)
unregistersymbol(CEmem)
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OldCheatEngineUser
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Posts: 1543

PostPosted: Thu Jan 25, 2018 2:35 pm    Post subject: Reply with quote

are you sure you know what you are writing in that script?
especially the fld and the cmp that comes right after it!

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FreeER
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Joined: 09 Aug 2013
Posts: 1089

PostPosted: Thu Jan 25, 2018 2:51 pm    Post subject: This post has 1 review(s) Reply with quote

I'd noticed it wants the *immediate at the end but hadn't noticed it had immediate*register in the disassembly... yeah that could be annoying if you had a lot lol

simple solution in lua:

Code:
script = [=[
[ENABLE]
alloc(CEmem,$1000)
registersymbol(CEmem)

define(game,cheatengine-x86_64.exe)

CEmem:
  fld [game+rax*2]
  cmp [game+rax*8],1
//  fld dword ptr [rax*2+cheatengine-x86_64.exe]
//  cmp dword ptr [rax*8+cheatengine-x86_64.exe],01



[DISABLE]
dealloc(CEmem)
unregistersymbol(CEmem)
]=]

newscript = {}
for line in script:gmatch('[^\r\n]+') do
  local line = line:gsub('%[(%a+)%*(%d+)%+(.*)%]', '[%3+%1*%2]')
--  print(line)
  newscript[#newscript+1] = line
end
newscript = table.concat(newscript, '\r\n')
print(newscript)


though I feel like it might also be possible to hook the disassembler and change the way it actually shows the instructions I don't feel like that'd work for templates etc. so....
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sbryzl
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PostPosted: Thu Jan 25, 2018 3:39 pm    Post subject: Reply with quote

Thanks. I don't know Lua too well. So I can just put any script in there and it will put all the multiplier operands at the end?
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FreeER
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PostPosted: Thu Jan 25, 2018 4:11 pm    Post subject: Reply with quote

It should yes, though I didn't do much testing with it so there may be cases where it fails Very Happy
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