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To:	cygwin AT cygwin DOT com
From:	Jean-Pierre Flori <jpflori AT gmail DOT com>
Subject:	Re: Possibly wrong address passed to callq asm instruction within MPIR test binaries
Date:	Mon, 7 Apr 2014 10:43:30 +0000 (UTC)
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Le Mon, 07 Apr 2014 10:42:13 +0000, Jean-Pierre Flori a écrit :

> Le Mon, 07 Apr 2014 09:49:27 +0000, Jean-Pierre Flori a écrit :
> 
>> Le Mon, 07 Apr 2014 09:14:41 +0000, Jean-Pierre Flori a écrit :
>>> Looking a little further, it seems the problematic functions are those
>>> directly assembled from assembly code.
>>> That was the case of mpn_store on x86_64.
>>> 
>>> And when I remove all dllimport, the call to the function mpn_addadd_n
>>> also gives a segfault when executing t-addadd_n.exe.
>>> 
>>> Note that the test t-aors.exe does not segfault, and indeed it only
>>> uses the mpn_add_1 and mpn_sub_1 functions which are not from
>>> assembly.
>>> 
>> It seems the dll produced at least has different treatment for these
>> tow kinds of functions.
>> 
>> jp AT napoleon-7 ~
>> $ nm local/bin/cygmpir-16.dll | grep store 00000004ff238170 T
>> __gmpn_store 00000004ff238198 t __gmpn_store.1 00000004ff2381a0 t
>> __gmpn_store.2 00000004ff2381b3 t __gmpn_store.3 00000004ff2381bd t
>> __gmpn_store.4 00000004ff2381be t __gmpn_store.5 00000004ff2381c3 t
>> __gmpn_store.6 00000004ff2381c9 t __gmpn_store.7 ...
>> 
>> jp AT napoleon-7 ~
>> $ nm local/bin/cygmpir-16.dll | grep addadd_n 00000004ff208e10 T
>> __gmpn_addadd_n 00000004ff208e50 t __gmpn_addadd_n.1 00000004ff208eac t
>> __gmpn_addadd_n.2 00000004ff208ebe t __gmpn_addadd_n.3 00000004ff208f0f
>> t __gmpn_addadd_n.4 00000004ff208f54 t __gmpn_addadd_n.5
>> 00000004ff208f6e t __gmpn_addadd_n.6
>> 
>> jp AT napoleon-7 ~
>> $ nm local/bin/cygmpir-16.dll | grep add_1 00000004ff207d40 T
>> __gmpn_add_1
>> 
>> And
>> 
>> jp AT napoleon-7 ~/mpir $ nm .libs/libmpir.dll.a | grep add_1
>> 0000000000000000 T __gmpn_add_1 0000000000000000 I __imp___gmpn_add_1
>> 
>> jp AT napoleon-7 ~/mpir $ nm .libs/libmpir.dll.a | grep addadd_n
>> 0000000000000000 I __imp___gmpn_addadd_n 0000000000000000 I
>> __nm___gmpn_addadd_n
> 
> Note in particular the __nm_ prefix.
> It is as advertiserd here: http://www.cygwin.com/ml/cygwin/2002-01/
> msg00236.html But when looking at the Cygwin32 produced import lib, I
> don't see any nm prefix.

In fact, I see some... but for much fewer functions, strange.


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