[OpenSmalltalk/opensmalltalk-vm] Latest commit segfaults win64x64.squeak.cog.spur (#498)

 

ee89a4d

Trying to load a 64-bit image, the VM segfaults in gcc3x-cointerp.c line 2809 memset(theStackMemory, 0, stackPagesBytes);

Other win64x64 targets might be affected. I tested both a custom build and bintray version: https://bintray.com/opensmalltalk/vm/download_file?file_path=squeak.cog.spur_win64x64_202005091950.zip

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I have rebuild a working VM from 020c80f
(CogVM source as per VMMaker.oscog-eem.2751 - may 8)

But this one segfaults: ee89a4d
(Merge branch 'Cog' of https://github.com/OpenSmalltalk/opensmalltalk-vm into Cog - may 9)

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Ah Ah!
If I revert those 3 lines from build.win64x64/common/Makefile.tools then the broken VM works again!

ifeq ($(COMPILER_TO_USE),clang)
COGDEFS:=$(COGDEFS) -mno-stack-arg-probe
endif

So the problem comes from 920248d

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This might be relevant material about stack handling in windows NT:

https://stackoverflow.com/questions/8400118/what-is-the-purpose-of-the-chkstk-function
https://archive.is/J01oT
https://docs.microsoft.com/en-us/windows/win32/devnotes/-win32-chkstk
https://bugs.llvm.org/show_bug.cgi?id=36221
https://bugs.llvm.org/show_bug.cgi?id=21896
...

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Closed #498.

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