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Getting base address from THREADSTACK or changing src to fix

 
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jrobin30
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Joined: 13 Jun 2020
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PostPosted: Thu Jun 18, 2020 3:06 pm    Post subject: Getting base address from THREADSTACK or changing src to fix Reply with quote
I was able to determine where a variable for the number of levels completed in the game is, however, cheat engine returns THREADSTACK0 instead of an exe or dll. The software I am using this for does not support the use of threadstack (it is the asl autosplitting language used with livesplit). Is there a way to get the address that references threadstack that would work in this case?

Alternatively, I have been in contact with the developer of this game and she has been extremely helpful in making changes to the code in order to set up the autosplitter (she changed a local variable to a global one so that it could be found in cheat engine). Is there a change to the source code that would fix this instead? Something that would give the variable a static address that could be pointed to instead of the threadstack?

Information on either of these solutions would be greatly appreciated.
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ParkourPenguin
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PostPosted: Thu Jun 18, 2020 4:03 pm    Post subject: Reply with quote
jrobin30 wrote:
Is there a way to get the address that references threadstack that would work in this case?
Just using asl, I highly doubt it, but I haven't looked at it much.
This seems like an issue that you should report. Perhaps link them to this post for help. Or perhaps do it yourself and make a pull request if you're confident in C#.

jrobin30 wrote:
Is there a change to the source code that would fix this instead?
From within Lua itself, probably not; however, from the language that sets up Lua, certainly. This is obviously language-dependent.
e.g. from the C code on Lua.org:
Code:
int main (int argc, char **argv) {
  int status, result;
  lua_State *L = luaL_newstate();  /* create state */
  //...
"L", the pointer to the Lua state, is stored locally in the stack (hence THREADSTACK0 base address). An alternative pointer path could be created by adding a couple lines like so:
Code:
static lua_State *easy_autosplit_base;

int main (int argc, char **argv) {
  int status, result;
  lua_State *L = luaL_newstate();  /* create state */
  easy_autosplit_base = L;  /* copy ptr to state for speedrunners and autosplit */
  //...
Here, the pointer "easy_autosplit_base" is outside any function and hence will be stored in the exe.
You could also just declare L as static:
Code:
static lua_State *L = luaL_newstate();  /* create state */
This should be fine too, but it changes the program more than one might expect.
The previous modification didn't really change anything - it just added another pointer path that can be used.

Is that pointer path in CE actually consistent? It likely goes through a few hash tables.
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