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From: jojelino <jojelino AT gmail DOT com>
Subject: Re: sigsegv in compiled cygwin
Date: Sun, 06 Feb 2011 03:12:51 +0900
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References: <iigs04$cui$1 AT dough DOT gmane DOT org> <20110204150118 DOT GA20523 AT ednor DOT casa DOT cgf DOT cx>
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i found small piece of code that need some comment.

from trunk

       int (*wsastartup) (int, WSADATA *);

       /* Don't use autoload to load WSAStartup to eliminate recursion. */
       wsastartup = (int (*)(int, WSADATA *))
		   GetProcAddress ((HMODULE) (dll->handle), "WSAStartup");

would have meant
       typedef int __stdcall (*pfnwsastartup) (int, WSADATA *);
       pfnwsastartup wsastartup;
       wsastartup = (pfnwsastartup)
		   GetProcAddress ((HMODULE) (dll->handle), "WSAStartup");

otherwise stack frame would be damaged.

On 2011-02-05 오전 12:01, Christopher Faylor wrote:
> On Fri, Feb 04, 2011 at 09:40:46PM +0900, jojelino wrote:
>> i'm trying to build cygwin with gcc 4.6 trunk. and compile succeed.
>> but when i try to run cygwin-linked executables with new-compiled-one,
>> initialization routine failed with sigsegv  at win32_whatever+14
>>
>>   0x61171a20<+0>:     jmp    0x61171a25<win32_GetKeyboardLayout AT 4+5>
>>     0x61171a25<+5>:     mov    0x61171a2c,%eax
>>     0x61171a2a<+10>:    call   *(%eax)
>>     0x61171a2c<+12>:    sbb    %al,%al
>> =>  0x61171a2e<+14>:    pop    %ss
>>
>> it seems redirection statement('Kludge alert') in autoload.cc didn't
>> work as expected.
>> what would i do??
>
> Well, since you're trying to do something cutting edge and unsupported
> it seems like you will have to debug the problem using gdb and, if you
> really want this to work, make a change to autoload.cc to fix the
> problem.  Look at a call frame for normal program and find where
> the return address is stored.
>
> Either that or wait for us to move to a newer version of gcc.
>
> cgf
>



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