[openssl-dev] Possible wrong restore register order in SEH for ecp_nistz256

[Jun Sun]

Hi,

I noticed Windows exception handler is added to ecp_nistz256-x86_64.pl. In function full_handler, when restore register contents, rbx is the first one with the smallest offset:


3181         mov     -8(%rax),%rbx

3182         mov     -16(%rax),%rbp

but when do push, rbp is always the first one push to the stack:


 497 .Lmul_mont:

 498         push    %rbp

 499         push    %rbx


That is, the contents of rbx is restored to rbp and the content of rbp is restored to rbx. I think it is probably a bug of the code.



Jun


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