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Auto Assembler Memory in Lua

 
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Haizan
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Joined: 25 Aug 2014
Posts: 46
PostPosted: Mon Aug 25, 2014 3:24 pm    Post subject: Auto Assembler Memory in Lua Reply with quote
I have some data I'd like to back up on [ENABLE] and restore later.
For that I allocate a block in the auto assembler and try to have a Lua function copy the data to my memory. However the symbol apparently isn't registered by the time the Lua function runs (or maybe the memory isn't even allocated yet?) so this test code fails:

Code:
[ENABLE]

alloc(backup, $600)
registersymbol(backup)

LuaCall(copybackup())

[DISABLE]

dealloc(backup)


with "copybackup" being something like:

Code:
function copybackup()
  local address = getAddress("backup")
  local bytes = readBytes(0xDEADBEEF, 0x600, true)
  writeBytes(address, bytes, 0x600)
end


Questions:

  • Is "backup" even allocated by the time "copybackup" is called?
  • If so, how do I get an address for "backup"?
  • If that is impossible how else could I get the job done? Do I have to write my whole script in Lua?
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daspamer
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PostPosted: Mon Aug 25, 2014 3:29 pm    Post subject: Reply with quote
Lua calls are executed before the script is.
You may achieve this by write your whole script in lua, or 2 auto assembler functions.
I'd go for whole script in lua (more options, ordered, can add/update table entries).
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Dark Byte
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Joined: 09 May 2003
Posts: 25778
Location: The netherlands
PostPosted: Mon Aug 25, 2014 3:53 pm    Post subject: Reply with quote
You can use readmem to backup the original bytes

Code:

[enable]
alloc(backup,$600)
registersymbol(backup)

backup:
readmem(someaddress,$600)

someaddress:
nop
nop
nop
...

[disable]

someaddress:
readmem(backup,16)

...


dealloc(backup)
unregistersymbol(backup)

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Haizan
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Joined: 25 Aug 2014
Posts: 46
PostPosted: Mon Aug 25, 2014 4:05 pm    Post subject: Reply with quote
Oh, that works!

For now I'm gonna go with the readmem method.

Thanks, you two.
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