[Scummvm-tracker] [ScummVM :: Bugs] #13554: LSL6 break to debugger when calling bad numbers

[ScummVM :: Bugs]

#13554: LSL6 break to debugger when calling bad numbers
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Reporter:  RayKoopa                      |       Owner:  (none)
    Type:  defect                        |      Status:  new
Priority:  normal                        |   Component:  Engine: SCI
 Version:                                |  Resolution:
Keywords:  debugger, signature mismatch  |        Game:  Leisure Suit Larry
                                         |  6
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Comment (by m-kiewitz):

 >I tried to reproduce this in DOSBox, but couldn't make it happen.

 Just fyi, these signature checks that we do internally are safety checks
 from our side. Original SCI did none of that. When signature checks fail,
 it's typically script bugs, which can cause all sorts of weird issues down
 the line, which is the cause why we are doing them.

 For example some kernel calls in SCI take 2 parameters. And a script calls
 it with one 1 parameter. That will get caught by the signature check.

 We also do checks for reads an uninitialized variables, which SCI also
 didn't care about and which caused random errors in some games. Some games
 even depend on a certain state of uninitialized variables. Our memory
 system works differently and initializes variables, so these script bugs
 caused a few issues in our SCI and were very hard to track down (we didn't
 have these checks in place originally).
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Ticket URL: <https://bugs.scummvm.org/ticket/13554#comment:2>
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