Re: [boost] [coroutine] x86 msvc11 stack corruption

Subject: Re: [boost] [coroutine] x86 msvc11 stack corruption
From: AVZ (susuman_at_[hidden])
Date: 2016-01-29 18:14:14

Just want to share workaround which work for our company.
(Fiber fix was not acceptable for that application)
Debugging differences in make_fcontext between 1.53 vs 1.57, I found that in
1.53 context area is cleanned with 0, but not in 1.57.
So we added explicit clear after line 100 in make_x86_64_ms_pe_masm.asm:

    sub  rax, 0128h

*
    ; memset context area
    pxor xmm0, xmm0
    movaps  [rax+008h], xmm0
    movaps  [rax+018h], xmm0
    movaps  [rax+028h], xmm0
    movaps  [rax+038h], xmm0
    movaps  [rax+048h], xmm0
    movaps  [rax+058h], xmm0
    movaps  [rax+068h], xmm0
    movaps  [rax+078h], xmm0
    movaps  [rax+088h], xmm0
    movaps  [rax+098h], xmm0
    movaps  [rax+0a8h], xmm0
    movaps  [rax+0b8h], xmm0
    movaps  [rax+0c8h], xmm0
    movaps  [rax+0d8h], xmm0
    movaps  [rax+0e8h], xmm0
    movaps  [rax+0f8h], xmm0
    movaps  [rax+108h], xmm0
    movaps  [rax+118h], xmm0
*

    ; third arg of make_fcontext() == address of context-function
    mov  [rax+0118h], r8

With that we are getting same behavior as 1.53 - no crash on DLL load.

Thanks,
AZ

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