Re: MS or cygwin dll debug tools/ was sys/sockio.h etc.
Mike Marchywka wrote: .rdata relocs it is then. This is why I lurk as I now remember something about this and, sure, I can find it on google. Of course, it would still be nice to have a fully instrumented load ( so where do I find the unreolcatable data?) . I relinked with -strip and used dumpbin to find all the symbols in rdata but there are several hundred. I thought I could grep the code for suspicious consts but no luck so far. The simplest method is just to tweak the linker script to make .rdata writable (or rather, to map both .data and .rdata input segments into the same .data output section.) There is no method that I'm aware of to find the name of the offending symbol. Actually, that's not quite true, see http://cygwin.com/ml/cygwin-patches/2008-q1/msg00067.html. As I said in that message though, those might just be coindicental and certainly not guaranteed across OS versions or whatever. Isn't there some way to find the offending relocation attempt? What does strace know about the stituation or does it just echo stuff from Windoze? strace under Cygwin is not like strace on other operating systems, it is really just a glorified viewer for a bunch of debug_printf statements that exist in the Cygwin code. The error occurs before the process even begins execution, during the period where NTLDR loads libraries into its address space. So, strace will be of no use. Brian -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
RE: MS or cygwin dll debug tools/ was sys/sockio.h etc.
.rdata relocs it is then. This is why I lurk as I now remember something about this and, sure, I can find it on google. Of course, it would still be nice to have a fully instrumented load ( so where do I find the unreolcatable data?) . I relinked with -strip and used dumpbin to find all the symbols in rdata but there are several hundred. I thought I could grep the code for suspicious consts but no luck so far. Isn't there some way to find the offending relocation attempt? What does strace know about the stituation or does it just echo stuff from Windoze? Thanks. Mike Marchywka 586 Saint James Walk Marietta GA 30067-7165 404-788-1216 (C)- leave message 989-348-4796 (P)- emergency only [EMAIL PROTECTED] Note: If I am asking for free stuff, I normally use for hobby/non-profit information but may use in investment forums, public and private. Please indicate any concerns if applicable. Note: Hotmail is possibly blocking my mom's entire ISP - try me on [EMAIL PROTECTED] if no reply here. Thanks. Date: Wed, 28 May 2008 14:08:31 -0700 From: [EMAIL PROTECTED] To: [EMAIL PROTECTED] CC: cygwin@cygwin.com Subject: Re: MS or cygwin dll debug tools/ was sys/sockio.h etc. Mike Marchywka wrote: I think I mentioned the windoze invokation before and got the definitive The app failed to initialize ... meesage. I didn't know about strace, let me see if I can expand on this, .rdata relocs it is then. Brian _ E-mail for the greater good. Join the i’m Initiative from Microsoft. http://im.live.com/Messenger/IM/Join/Default.aspx?source=EML_WL_ GreaterGood -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
MS or cygwin dll debug tools/ was sys/sockio.h etc.
Regarding recent comments on dll problems and understanding cygwin1.dll versus msvcrt, I was curious to know if anyone has used these ( free? ) MS tools or has comments on competing products? http://msdn.microsoft.com/en-us/library/cc267862.aspx http://www.microsoft.com/whdc/devtools/debugging/installx86.mspx I thought I may be able to download a few pieces like some of the sysinternals products but AFAIK you now need to download 17MB and hope the msi doesn't do anything funny. It may be worth it but if there is a better alternative I'd like to try that first. Apparently gdb didn't let you do anything until getting to main() which is after the initial process loads but some of the pages for the above tools suggest you can examine loading. Also, fwiw, that glut program I cited earlier as an example of something that seems to work but that invokes msvcrt and cygwin1, is available here, http://www.spottext.com/marchywka/distroform.cfm?src=cygwindll but I will warn you that there is nothing ready for distribution and the pages are a bit confusing. I collected a bunch of works-in-progress and started to make them available as part of other work I was doing. I finally did determine that the streaming data viewer and molecule viewer uses for the glut program were in fact useful to me and tried to document some of the features but I'm not sure I will ever document or clean anything up to the point of being coherent. The glut program does not always seem to start up reliably on first invokation after a reboot and does have odd response to ctrl-C but otherwise seems fine ( I assumed this was an issue with opengl, not cygwin). Thanks. From: [EMAIL PROTECTED] To: cygwin@cygwin.com Subject: RE: fate/resolution/location of things like sys/sockio.h Date: Tue, 27 May 2008 07:03:55 -0400 Date: Tue, 27 May 2008 00:54:37 -0700 From: [EMAIL PROTECTED] Mike Marchywka wrote: $ g++ nmapjunk.a libdnet-stripped/src/junkbin.a liblua/junkbin.a -Lnbase -lnbase -Lnsock/src -lnsock -Llibpcap -lpcap -liphlpapi -lws2_32 -lpcre -L. -lPacket I would not expect this to work in any case. Cygwin has no libpcap, so you must be using the native windows winpcap, which is not a Cygwin library (it's linked with MSVCRT.) I have winpcap for an earlier install of ShowTraffic which runs fine. The nmap download comes with its own and getting everything consistent may be a problem but I can't come up with a diagnostic that confirms death during packet.dll load. I guess that is why I am more interested in diagnostic tools rather than expecting to find someone who knows offhand how to link my c++ version of nmap :) Is there some simple way to get gdb to tell you what it was trying to do if it dies before getting to main()? From what I could tell, you couldn't set a break point etc to diagnose the CRT initialization stuff. As far as that goes, what tools are there for dumping object or a files? Thanks. Mike Marchywka 586 Saint James Walk Marietta GA 30067-7165 404-788-1216 (C)- leave message 989-348-4796 (P)- emergency only [EMAIL PROTECTED] Note: If I am asking for free stuff, I normally use for hobby/non-profit information but may use in investment forums, public and private. Please indicate any concerns if applicable. Note: Hotmail is possibly blocking my mom's entire ISP - try me on [EMAIL PROTECTED] if no reply here. Thanks. Date: Tue, 27 May 2008 00:54:37 -0700 From: [EMAIL PROTECTED] To: [EMAIL PROTECTED] CC: cygwin@cygwin.com Subject: Re: fate/resolution/location of things like sys/sockio.h Mike Marchywka wrote: $ g++ nmapjunk.a libdnet-stripped/src/junkbin.a liblua/junkbin.a -Lnbase -lnbase -Lnsock/src -lnsock -Llibpcap -lpcap -liphlpapi -lws2_32 -lpcre -L. -lPacket I would not expect this to work in any case. Cygwin has no libpcap, so you must be using the native windows winpcap, which is not a Cygwin library (it's linked with MSVCRT.) Brian -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/ _ Make every e-mail and IM count. Join the i’m Initiative from Microsoft. http://im.live.com/Messenger/IM/Join/Default.aspx?source=EML_WL_ MakeCount -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/ _ Make every e-mail and IM count. Join the i’m Initiative from Microsoft. http://im.live.com/Messenger/IM/Join/Default.aspx?source=EML_WL_ MakeCount -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ:
Re: MS or cygwin dll debug tools/ was sys/sockio.h etc.
On 2008-05-28 14:15Z, Mike Marchywka wrote: I was curious to know if anyone has used these ( free? ) MS tools Probably not free as in freedom; I haven't used them. Apparently gdb didn't let you do anything until getting to main() which is after the initial process loads but some of the pages for the above tools suggest you can examine loading. Using cygwin's gdb on a MinGW app, I can set this breakpoint b '__mingw_CRTStartup' on the function that invokes main(), and then examine variables before main() is invoked. For a Cygwin app, I guess you'd break on 'mainCRTStartup'. Does that breakpoint happen early enough to meet your needs? -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Re: MS or cygwin dll debug tools/ was sys/sockio.h etc.
Greg Chicares wrote: Using cygwin's gdb on a MinGW app, I can set this breakpoint b '__mingw_CRTStartup' on the function that invokes main(), and then examine variables before main() is invoked. For a Cygwin app, I guess you'd break on 'mainCRTStartup'. Does that breakpoint happen early enough to meet your needs? You can also do info target to display the entry point and then set a breakpoint on it as e.g. b *0x401000 if you want to start at the very first instruction of the binary. There is no such can't debug before main restriction. Brian -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Re: MS or cygwin dll debug tools/ was sys/sockio.h etc.
Hello, * On Wed, May 28, 2008 at 10:15:05AM -0400 Mike Marchywka wrote: Regarding recent comments on dll problems and understanding cygwin1.dll versus msvcrt, I was curious to know if anyone has used these ( free? ) MS tools or has comments on competing products? http://msdn.microsoft.com/en-us/library/cc267862.aspx http://www.microsoft.com/whdc/devtools/debugging/installx86.mspx These a free in the sense that you do not have to pay to use them. Additionally, you can get in contact with users and even some of the developers on the Usenet (news:microsoft.public.windbg). I use WinDBG rather frequently, and I like it very much. However, I must tell you that I mainly use it for kernel-mode debugging. The Symbol Server allows you to put the debugging symbols on a server. You can even have a history of them; that is, for ever version of the executables you give to customers (or to others), you put the symbols on the server. If you get a crash dump afterwards from someone, WinDBG automatically determines the right symbols. If you have also set up the source server, it even gets the right sources out of your source control system. This is very handy. Note, however, that this mechanism relies on .PDB files for the debugging information (I think the old-style .SYM work, also, but I have not tested it). I never tried to use this with Cygwin or Mingw, however. Regards, Spiro. -- Spiro R. Trikaliotis http://opencbm.sf.net/ http://www.trikaliotis.net/ http://www.viceteam.org/ -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
RE: MS or cygwin dll debug tools/ was sys/sockio.h etc.
first instruction of the binary. There is no such can't debug before main restriction. I think what bothered me is I just tried to step it to get minimum initial increment and that bombed- so I just assumed it wouldn't be early enough. In any case, it looked like I needed to instrument the loading process, (gdb) info functions CRT All functions matching regular expression CRT: Non-debugging symbols: 0x00401000 WinMainCRTStartup 0x00401000 mainCRTStartup (gdb) info target Symbols from /cygdrive/e/new/temp/nmap/src3/nmap-4.62/a.exe. Local exec file: `/cygdrive/e/new/temp/nmap/src3/nmap-4.62/a.exe', file type pei-i386. Entry point: 0x401000 0x00401000 - 0x004e9608 is .text 0x004ea000 - 0x004ebaa0 is .data 0x004ec000 - 0x00509c24 is .rdata 0x0050a000 - 0x00519b50 is .bss 0x0051a000 - 0x0051bfa8 is .idata (gdb) b *0x0401000 Breakpoint 1 at 0x401000 (gdb) run Starting program: /cygdrive/e/new/temp/nmap/src3/nmap-4.62/a.exe Program received signal SIGSEGV, Segmentation fault. Program received signal SIGSEGV, Segmentation fault. Program received signal SIGSEGV, Segmentation fault. Program exited with code 0200. You can't do that without a process to debug. (gdb) Date: Wed, 28 May 2008 08:36:33 -0700 From: [EMAIL PROTECTED] To: [EMAIL PROTECTED] CC: cygwin@cygwin.com Subject: Re: MS or cygwin dll debug tools/ was sys/sockio.h etc. Greg Chicares wrote: Using cygwin's gdb on a MinGW app, I can set this breakpoint b '__mingw_CRTStartup' on the function that invokes main(), and then examine variables before main() is invoked. For a Cygwin app, I guess you'd break on 'mainCRTStartup'. Does that breakpoint happen early enough to meet your needs? You can also do info target to display the entry point and then set a breakpoint on it as e.g. b *0x401000 if you want to start at the very first instruction of the binary. There is no such can't debug before main restriction. Brian -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/ _ Give to a good cause with every e-mail. Join the i’m Initiative from Microsoft. http://im.live.com/Messenger/IM/Join/Default.aspx?souce=EML_WL_ GoodCause -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Re: MS or cygwin dll debug tools/ was sys/sockio.h etc.
Mike Marchywka wrote: (gdb) b *0x0401000 Breakpoint 1 at 0x401000 (gdb) run Starting program: /cygdrive/e/new/temp/nmap/src3/nmap-4.62/a.exe Program received signal SIGSEGV, Segmentation fault. Program received signal SIGSEGV, Segmentation fault. Program received signal SIGSEGV, Segmentation fault. Program exited with code 0200. You can't do that without a process to debug. (gdb) The fact that it never actually begins execution therefore implies that it encounters a fault by the OS loader during process initialization, such as the const data in .rdata needing relocation due to auto-imports situation. I bet that if you invoke it via strace or from a native command prompt (not bash) you will see a dialog box explaining the fault since the SetErrorMode (SEM_FAILCRITICALERRORS) stuff won't be active. Brian -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Re: MS or cygwin dll debug tools/ was sys/sockio.h etc.
On Wed, May 28, 2008 at 12:47:44PM -0700, Brian Dessent wrote: Mike Marchywka wrote: (gdb) b *0x0401000 Breakpoint 1 at 0x401000 (gdb) run Starting program: /cygdrive/e/new/temp/nmap/src3/nmap-4.62/a.exe Program received signal SIGSEGV, Segmentation fault. Program received signal SIGSEGV, Segmentation fault. Program received signal SIGSEGV, Segmentation fault. Program exited with code 0200. You can't do that without a process to debug. (gdb) The fact that it never actually begins execution therefore implies that it encounters a fault by the OS loader during process initialization, such as the const data in .rdata needing relocation due to auto-imports situation. I bet that if you invoke it via strace or from a native command prompt (not bash) you will see a dialog box explaining the fault since the SetErrorMode (SEM_FAILCRITICALERRORS) stuff won't be active. Aren't we still talking about using msvcrt and cygwin1 in the same application where something like a SIGSEGV prior to initialization would be the expected consequences of mixing the two dlls? I'd think it likely that either msvcrt or cygwin1.dll to become confused during dll initialization if one or the other was present. cgf -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Re: MS or cygwin dll debug tools/ was sys/sockio.h etc.
Christopher Faylor wrote: Aren't we still talking about using msvcrt and cygwin1 in the same application where something like a SIGSEGV prior to initialization would be the expected consequences of mixing the two dlls? Right, that too I suppose. You'd have to set breakpoints at the DllMain of each of those. Or use a startup-profiler like dependency walker. Brian -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
RE: MS or cygwin dll debug tools/ was sys/sockio.h etc.
a native command prompt (not bash) you will see a dialog box explaining the fault since the SetErrorMode (SEM_FAILCRITICALERRORS) stuff won't be active. I think I mentioned the windoze invokation before and got the definitive The app failed to initialize ... meesage. I didn't know about strace, let me see if I can expand on this, $ strace a.exe --- Process 1380, exception C005 at 77F84E71 --- Process 1380, exception C005 at 77FAC57C Mike Marchywka 586 Saint James Walk Marietta GA 30067-7165 404-788-1216 (C)- leave message 989-348-4796 (P)- emergency only [EMAIL PROTECTED] Note: If I am asking for free stuff, I normally use for hobby/non-profit information but may use in investment forums, public and private. Please indicate any concerns if applicable. Note: Hotmail is possibly blocking my mom's entire ISP - try me on [EMAIL PROTECTED] if no reply here. Thanks. Date: Wed, 28 May 2008 12:47:44 -0700 From: [EMAIL PROTECTED] To: [EMAIL PROTECTED] CC: cygwin@cygwin.com Subject: Re: MS or cygwin dll debug tools/ was sys/sockio.h etc. Mike Marchywka wrote: (gdb) b *0x0401000 Breakpoint 1 at 0x401000 (gdb) run Starting program: /cygdrive/e/new/temp/nmap/src3/nmap-4.62/a.exe Program received signal SIGSEGV, Segmentation fault. Program received signal SIGSEGV, Segmentation fault. Program received signal SIGSEGV, Segmentation fault. Program exited with code 0200. You can't do that without a process to debug. (gdb) The fact that it never actually begins execution therefore implies that it encounters a fault by the OS loader during process initialization, such as the const data in .rdata needing relocation due to auto-imports situation. I bet that if you invoke it via strace or from a native command prompt (not bash) you will see a dialog box explaining the fault since the SetErrorMode (SEM_FAILCRITICALERRORS) stuff won't be active. Brian -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/ _ Keep your kids safer online with Windows Live Family Safety. http://www.windowslive.com/family_safety/overview.html?ocid=TXT_TAGLM_WL_Refresh_family_safety_052008 -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Re: MS or cygwin dll debug tools/ was sys/sockio.h etc.
Mike Marchywka wrote: I think I mentioned the windoze invokation before and got the definitive The app failed to initialize ... meesage. I didn't know about strace, let me see if I can expand on this, .rdata relocs it is then. Brian -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
