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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 10:42:13 +0000 (UTC)
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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.


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