Error in NatLib_InstallImmutableStateBlock??

Hi,

I think I found an error, or at least misleading information in the
description for NatLib_InstallImmutableStateBlock.  In Native_API it
states that the method simply outputs a 0 in the accumulator if there
was no error.  It makes no mention of changing anything.  However, I
found that the 2 data pointers used as input are not preserved across
the method call.  I wrote code that writes into an immutable state block
with a LibraryID supplied by the user as input to the native method.  If
the state block doesn't already exist, the method is supposed to malloc
it, install it and then write into it.  I couldn't understand why the
1st time I would write it wouldn't work but the second and all
subsequent times did work until I noticed that
NatLib_InstallImmutableStateBlock is screwing with the data pointers.
Here is the debug information I got out of the diagnostic port.

Data pointers into the NatLib_InstallImmutableStateBlock method:

DPTR1:1C9A4A
DPTR2:1C9A67

Data pointers after the NatLib_InstallImmutableStateBlock method:
DPTR1:1C9A52
DPTR2:1CCA7C

In order to get the program to work properly, I had to preserve DPTR1
across the method call myself since otherwise I'd be writing into the
wrong memory location.

Is this an error?  Or am I just supposed to know to preserve things
myself?

Another question, is there a list of registers that are safe and those
that are unsafe to manipulate in a native method?  I tried copying into
DPTR3 as slack space instead of pushing and popping off the stack and
got very bizarre results which leads me to think DPTR3 is off limits.
Is this true?  What about other registers.

Thanks,
Jonathan Sharret

TELEGRID Technologies, Inc.
Email: j.sharret-vt2K7lilQm9Wk0Htik3J/[email protected]


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