[ECOS] Re: Trying to Debug Ecos using GDB

Fahd Abidi fabidi@ultsol.com
Thu Apr 13 13:12:00 GMT 2006

My Sincerest apologies to everyone. I had been opening hello.o with gdb
not hello.elf, hello .elf has all the symbols built into it. Thanks for
all your support and sorry about wasting your time.  :(


-----Original Message-----
From: nickg@xl5.calivar.com [mailto:nickg@xl5.calivar.com] On Behalf Of
Nick Garnett
Sent: Thursday, April 13, 2006 5:46 AM
To: Fahd Abidi
Cc: Grant Edwards; ecos-discuss@ecos.sourceware.org
Subject: Re: [ECOS] Re: Trying to Debug Ecos using GDB

"Fahd Abidi" <fabidi@ultsol.com> writes:

> Yes the kernel is built with debug symbols. I checked the libtarget.a 
> file with objdump -s and saw disassembly and source code. So its in 
> there. Libtarget.a is 17mb, if I strip it of symbols using objcopy -g 
> then it drops to 1.7mb.
> When I go to the steps of linking with my application the final hello 
> executable leaves out the symbols from the kernel.
> I may not be following what Andrew is saying, as far as I can tell I 
> have included the debug symbols from all Parts of the kernel that are 
> used, the appropriate setting in the kernel to enable debug bits is 
> set. The -g CFLAG bit is set in the top level of the ecos project, so 
> all debug symbols should be added.
> The resulting hello executable only has source info for hello.c no 
> other sources are in that executable. I checked the compiler output 
> and saw the -g flag getting passed to the application as well.

How are you detecting that the symbols are not there? Full debug info
should be included in the executable by default.

If I run nm on a typical test executable I see all the kernel symbols.
For example:

$ arm-elf-nm -CSn tm_basic | grep Cyg_Thread
62007de4 00000564 T Cyg_Thread::Cyg_Thread(unsigned int, void
(*)(unsigned int), unsigned int, char*, unsigned int, unsigned int)
62008348 00000564 T Cyg_Thread::Cyg_Thread(unsigned int, void
(*)(unsigned int), unsigned int, char*, unsigned int, unsigned int)
620088ac 00000088 T Cyg_Thread::check_this(cyg_assert_class_zeal) const
62008934 00000180 T Cyg_Thread::reinitialize() 62008ab4 00000130 T
Cyg_Thread::~Cyg_Thread() 62008be4 00000130 T Cyg_Thread::~Cyg_Thread()
62008d14 00000064 T Cyg_Thread::exit() 62008d78 00000034 T
62008dac 00000118 T Cyg_Thread::sleep()
62008ec4 00000108 T Cyg_Thread::wake()
62008fcc 00000128 T Cyg_Thread::suspend()
620090f4 00000120 T Cyg_Thread::resume()
62009214 0000011c T Cyg_Thread::force_resume()
62009330 0000014c T Cyg_Thread::kill()
6200947c 00000224 T Cyg_Thread::set_priority(int)
620096a0 0000011c T Cyg_Thread::delay(unsigned long long) 620097bc
00000020 T Cyg_Thread::deliver_exception(int, unsigned int) 620097dc
0000010c T Cyg_ThreadTimer::alarm(Cyg_Alarm*, unsigned int) 62009a98
00000010 t
62009aa8 00000010 t
6200a154 0000003c T Cyg_ThreadQueue_Implementation::enqueue(Cyg_Thread*)
6200a190 00000078 T Cyg_ThreadQueue_Implementation::remove(Cyg_Thread*)
6200a460 00000040 T
6200a4a0 000002e4 T
6200a784 000001e8 T
6200a96c 00000014 T
Cyg_Scheduler_Implementation::set_idle_thread(Cyg_Thread*, unsigned int)
6200a980 00000004 T
6200a984 00000004 T
6200ad38 00000054 T Cyg_ThreadQueue_Implementation::dequeue()
6200b488 000000e8 T Cyg_Scheduler::thread_entry(Cyg_Thread*)
6200b668 0000002c T Cyg_SchedThread::Cyg_SchedThread(Cyg_Thread*,
unsigned int) 6200b694 00000090 T
Cyg_SchedThread::set_inherited_priority(int, Cyg_Thread*) 6200b724
00000018 T Cyg_SchedThread::relay_inherited_priority(Cyg_Thread*,
Cyg_ThreadQueue*) 6200b7d4 000000b0 T
6200b884 00000004 T Cyg_SchedThread::relay_priority(Cyg_Thread*,
Cyg_ThreadQueue*) 620135ac 00000020 r
620135cc 00000020 r Cyg_Thread::sleep()::__PRETTY_FUNCTION__
620135ec 0000001b r Cyg_Thread::suspend()::__PRETTY_FUNCTION__
62013608 0000001a r Cyg_Thread::resume()::__PRETTY_FUNCTION__
62013624 00000020 r Cyg_Thread::force_resume()::__PRETTY_FUNCTION__
62013644 0000002c r Cyg_Thread::set_priority(int)::__PRETTY_FUNCTION__
62013b94 0000003b r
62013bd0 0000003b r
62013f2c 00000048 r Cyg_SchedThread::set_inherited_priority(int,
Cyg_Thread*)::__PRETTY_FUNCTION__ 62013fa8 00000034 r
62015024 00000004 D Cyg_Thread::thread_list
621a736c 00000008 B Cyg_Thread::exception_control

What happens if you try that on your hello executable?

Nick Garnett                                 eCos Kernel Architect
http://www.ecoscentric.com            The eCos and RedBoot experts

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