This is a copy of my sed script for LD_PRELOAD libraries (available on this site as well) modified to just relay the call to the original library. If you compile this with the appropriate options, it will force 16-byte stack alignment.
While the sed script generates most of the code, you still have to
identify fucntions to override, find their prototypes, and add them to
the code. I have done this for the game Eschalon Book I in
stack-fix.c: at first I added functions that were crashing, but when
gdb was no longer able to identify these (due to missing unwind
information), I went ahead and added all symbols in glx or GL directly
referred to by the binary. This also includes glXGetProcAddressARB,
which I treat differently in order to find out what addresses are
being queried and adding them manually (in this case, only one
function).
To generate the code, run sed (you will end up with a mostly empty/non-functional binary otherwise):
sed -i -f addldovr.sed stack-fix.c
To compile, make sure and set the stack alignment option. The
following assumes that -mpreferred-stack-boundary=4 is the default
(that's the cause of this issue in the first place, so it's pretty
likely); otherwise add that as well.
gcc -m32 -mincoming-stack-boundary=2 -shared -o stack-fix.{so,c} -ldl -lX11 -lGL
To clean the source for further editing and/or git activity, run sed:
sed -i -f delldovr.sed stack-fix.c
To use, just add stack-fix.so to the LD_PRELOAD environment variable,
using the full path if not in your LD_LIBRARY_PATH.
This cures the mysterious crashing on the Eschalon game series. Books II and III don't use any additional GL functions, and they haven't crashed so far. It may cure others, as well, if you add enough prototypes.
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