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Debugging VICE emulator for AVR32

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	Debugging VICE emulator for AVR32 by John Voltz-2 :: Rate this Message: Reply to Author \| View Threaded \| Show Only this Message Hi, For some time now, I have been trying to debug the VICE emulator in buildroot. There seems to be a problem with uClibc 0.9.29. VICE will not start on x86 or on AVR32, but it would run in the past on uClibc 0.9.28. In fact, the old binary of VICE that I built for 0.9.28 will run with 0.9.29. I find that strange. I'm hoping someone can help me make sense of the gdb info. Here is where the segfault occurs immediately after starting VICE on AVR32: 0x2ada63d4 <_pthread_cleanup_push_defer>: pushm r4-r7,lr - 0x2ada63d6 <_pthread_cleanup_push_defer+2>: lddpc r6,0x2ada63f0 <_pthread_cleanup_push_defer+28> - 0x2ada63d8 <_pthread_cleanup_push_defer+4>: rsub r6,pc - 0x2ada63da <_pthread_cleanup_push_defer+6>: mov r8,18 - 0x2ada63de <_pthread_cleanup_push_defer+10>: ld.w r8,r6[r8<<0x2] - 0x2ada63e2 <_pthread_cleanup_push_defer+14>: ld.w r8,r8[172] - 0x2ada63e6 <_pthread_cleanup_push_defer+18>: cp.w r8,0 - 0x2ada63e8 <_pthread_cleanup_push_defer+20>: breq 0x2ada63ec <_pthread_cleanup_push_defer+24> - 0x2ada63ea <_pthread_cleanup_push_defer+22>: icall r8 - 0x2ada63ec <_pthread_cleanup_push_defer+24>: popm r4-r7,pc - 0x2ada63ee <_pthread_cleanup_push_defer+26>: add r0,r0 - 0x2ada63f0 <_pthread_cleanup_push_defer+28>: unknown - 0x2ada63f2 <_pthread_cleanup_push_defer+30>: breq 0x2ada6482 <__libc_pthread_init+38> Register contents: r0 {0x0} r1 {0x2adddffc} r2 {0x2adde000} r3 {0x2adddff8} r4 {0x7fc6b688} r5 {0x0} r6 {0x2ada9f58} r7 {0x2add82e0} r8 {0x2ada63d4} r9 {0x0} r10 {0x2adab600} r11 {0x2ada6338} r12 {0x7fc6b64c} sp {0x7fa6e010} lr {0x2ada63ec} pc {0x2ada63d4} _______________________________________________ buildroot mailing list buildroot@... http://busybox.net/mailman/listinfo/buildroot
	Re: [BR-AVR32] Debugging VICE emulator for AVR32 by Hans-Christian Egtvedt-5 :: Rate this Message: Reply to Author \| View Threaded \| Show Only this Message On Wed, 2008-06-18 at 21:44 -0400, John Voltz wrote: > Hi, > > For some time now, I have been trying to debug the VICE emulator in > buildroot. There seems to be a problem with uClibc 0.9.29. VICE will > not start on x86 or on AVR32, but it would run in the past on uClibc > 0.9.28. In fact, the old binary of VICE that I built for 0.9.28 will > run with 0.9.29. I find that strange. I'm hoping someone can help me > make sense of the gdb info. Here is where the segfault occurs > immediately after starting VICE on AVR32: > Do you know exactly where it segfaults? Which line in the assembler dump below? Which toolchain are you using? I would recommend using the toolchain in the latest Buildroot for AVR32 v2.2.0-rc3. > 0x2ada63d4 <_pthread_cleanup_push_defer>: pushm r4-r7,lr > - 0x2ada63d6 <_pthread_cleanup_push_defer+2>: lddpc r6,0x2ada63f0 <_pthread_cleanup_push_defer+28> > - 0x2ada63d8 <_pthread_cleanup_push_defer+4>: rsub r6,pc Putting GOT pointer in r6. > - 0x2ada63da <_pthread_cleanup_push_defer+6>: mov r8,18 > - 0x2ada63de <_pthread_cleanup_push_defer+10>: ld.w r8,r6[r8<<0x2] Fetch a pointer from the GOT with offset 0x48 (18 << 0x02). > - 0x2ada63e2 <_pthread_cleanup_push_defer+14>: ld.w r8,r8[172] Then load something from an offset from the loaded pointer, accessing a struct perhaps? Does not seem like r8 is zero at this point, given your register dump below. > - 0x2ada63e6 <_pthread_cleanup_push_defer+18>: cp.w r8,0 Compare it to zero, function pointer? > - 0x2ada63e8 <_pthread_cleanup_push_defer+20>: breq 0x2ada63ec <_pthread_cleanup_push_defer+24> > - 0x2ada63ea <_pthread_cleanup_push_defer+22>: icall r8 Jump to the fetched function(?). > - 0x2ada63ec <_pthread_cleanup_push_defer+24>: popm r4-r7,pc Return > - 0x2ada63ee <_pthread_cleanup_push_defer+26>: add r0,r0 Alignment of local function data. > - 0x2ada63f0 <_pthread_cleanup_push_defer+28>: unknown > - 0x2ada63f2 <_pthread_cleanup_push_defer+30>: breq 0x2ada6482 <__libc_pthread_init+38> > Address of the GOT pointer. Do not really see anything immediate wrong with this code. > Register contents: > r0 {0x0} > r1 {0x2adddffc} > r2 {0x2adde000} > r3 {0x2adddff8} > r4 {0x7fc6b688} > r5 {0x0} > r6 {0x2ada9f58} > r7 {0x2add82e0} > r8 {0x2ada63d4} > r9 {0x0} > r10 {0x2adab600} > r11 {0x2ada6338} > r12 {0x7fc6b64c} > sp {0x7fa6e010} > lr {0x2ada63ec} > pc {0x2ada63d4} > -- With kind regards, Hans-Christian Egtvedt, Applications Engineer _______________________________________________ buildroot mailing list buildroot@... http://busybox.net/mailman/listinfo/buildroot
	Re: Debugging VICE emulator for AVR32 by Peter Korsgaard-3 :: Rate this Message: Reply to Author \| View Threaded \| Show Only this Message >>>>> "John" == John Voltz <john.voltz@...> writes: John> Hi, John> For some time now, I have been trying to debug the VICE John> emulator in buildroot. There seems to be a problem with uClibc John> 0.9.29. VICE will not start on x86 or on AVR32, but it would John> run in the past on uClibc 0.9.28. In fact, the old binary of John> VICE that I built for 0.9.28 will run with 0.9.29. I find that John> strange. I'm hoping someone can help me make sense of the gdb John> info. Here is where the segfault occurs immediately after John> starting VICE on AVR32: I've also noticed pthread problems with avahi on uclibc 0.9.29 (on PPC), but I haven't had time to debug it yet. The same setup works with 0.9.28.3. -- Bye, Peter Korsgaard _______________________________________________ buildroot mailing list buildroot@... http://busybox.net/mailman/listinfo/buildroot
	Re: Debugging VICE emulator for AVR32 by mpfj :: Rate this Message: Reply to Author \| View Threaded \| Show Only this Message Peter Korsgaard wrote: > I've also noticed pthread problems with avahi on uclibc 0.9.29 (on > PPC), but I haven't had time to debug it yet. The same setup works > with 0.9.28.3 Hi Peter, I'm also having problems with avahi-daemon segfaulting (on the NGW100 defconfig plus avahi). I raised a ticket on avahi.org (http://avahi.org/ticket/224), and after a bit of novice gdb investgations have shown up a "pthread" function may well be the cause. In case of a post 0.9.29 bug fix, I did try to use the uclibc daily snapshot, but it didn't compile at all. Did you manage to get anywhere with this, or is it still outstanding ? Regards Mark `[mpfj.vcf]` `begin:vcard fn:Mark Jackson n:Jackson;Mark org:Mercury IMC Ltd adr:Derwent Road;;George House;Malton;North Yorkshire;YO17 6YB;UK email;internet:mpfj@... tel;work:01653 697 200 tel;fax:08700 667 325 tel;cell:07834 456 394 x-mozilla-html:TRUE url:www.mimc.co.uk version:2.1 end:vcard` _______________________________________________ buildroot mailing list buildroot@... http://busybox.net/mailman/listinfo/buildroot
	Re: Debugging VICE emulator for AVR32 by John Voltz-2 :: Rate this Message: Reply to Author \| View Threaded \| Show Only this Message My problem was that VICE wasn't being linked against libpthread. Simply adding a LDFLAGS="-lpthread" to the configure statement fixed it. John On Tue, Jul 22, 2008 at 3:31 PM, Mark Jackson <mpfj@...> wrote: Peter Korsgaard wrote: I've also noticed pthread problems with avahi on uclibc 0.9.29 (on PPC), but I haven't had time to debug it yet. The same setup works with 0.9.28.3 Hi Peter, I'm also having problems with avahi-daemon segfaulting (on the NGW100 defconfig plus avahi). I raised a ticket on avahi.org (http://avahi.org/ticket/224), and after a bit of novice gdb investgations have shown up a "pthread" function may well be the cause. In case of a post 0.9.29 bug fix, I did try to use the uclibc daily snapshot, but it didn't compile at all. Did you manage to get anywhere with this, or is it still outstanding ? Regards Mark _______________________________________________ buildroot mailing list buildroot@... http://busybox.net/mailman/listinfo/buildroot