26 lines
859 B
NASM
26 lines
859 B
NASM
EXTERN _setjmp: proc
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PUBLIC _setjmp_wrapper
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_TEXT SEGMENT
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_setjmp_wrapper PROC
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; Why do we need this wrapper?
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; Short answer: Windows default implementation of setjmp/longjmp is incompatible with generated code.
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; A longer answer: https://blog.lazym.io/2020/09/21/Unicorn-Devblog-setjmp-longjmp-on-Windows/.
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; From qemu os-win32 comments:
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; > On w64, setjmp is implemented by _setjmp which needs a second parameter.
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; > If this parameter is NULL, longjump does no stack unwinding.
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; > That is what we need for QEMU. Passing the value of register rsp (default)
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; > lets longjmp try a stack unwinding which will crash with generated code.
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; It's true indeed, but MSVC doesn't has a setjmp signature which receives two arguements.
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; Therefore, we add a wrapper to keep the second argument zero.
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xor rdx, rdx
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jmp _setjmp
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_setjmp_wrapper ENDP
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_TEXT ENDS
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END |