asm debug problem

asm debug problem

[Yi Tang]

Hello maintainer,

I have got some trouble using gdb for my source code.

My code, written in asm and compiled by gcc, should be attached to an rtos 
library (ecos) to perform some test. I found it is not possible to debug the 
assemble source code. My assemble code, to build the function 
(usr_interrupt_vsr()),  is in a separate file called uivsr.S. And it is 
linked to the OS through a head file. However, when I run the gdb, it goes 
to some other file in OS kernel, the clock.cxx (also wrong line num, I'm 
pretty sure no such function in this file). And the language is set to C++. 
I also tried gas as assembler, same situation.

Following is the snapshot, hope you guys can give me some hints.

Regards,
Tony

Current language:  auto; currently c++
Loading section .rom_vectors, size 0x1390 lma 0x40000000
Loading section .text, size 0x54b8 lma 0x40001390
Loading section .rodata, size 0x218 lma 0x40006848
Loading section .data, size 0x354 lma 0x40006a60
Start address 0x40001208, load size 28084
Transfer rate: 532398 bits/sec, 275 bytes/write.

Breakpoint 1, cyg_user_start () at astest.c:10
Current language:  auto; currently c
0x400013a0 in usr_interrupt_vsr () at 
/ecos-c/Cygwin/ecos/ecos-dtimer/packages/kernel/current/src/common/clock.cxx:85
Current language:  auto; currently c++

Re: asm debug problem

[Daniel Jacobowitz]

On Tue, Nov 06, 2007 at 11:48:59PM +1000, Yi Tang wrote:
> Hello maintainer,
> 
> I have got some trouble using gdb for my source code.
> 
> My code, written in asm and compiled by gcc, should be attached to an rtos 
> library (ecos) to perform some test. I found it is not possible to debug the 
> assemble source code. My assemble code, to build the function 
> (usr_interrupt_vsr()),  is in a separate file called uivsr.S. And it is linked 
> to the OS through a head file. However, when I run the gdb, it goes to some 
> other file in OS kernel, the clock.cxx (also wrong line num, I'm pretty sure no 
> such function in this file). And the language is set to C++. I also tried gas 
> as assembler, same situation.

Did you assemble the file with -g to gcc, or --gdwarf2 to gas?

-- 
Daniel Jacobowitz
CodeSourcery

Re: asm debug problem

[Yi Tang]

Yes, I think it got the -g option for gcc and gstab for gas. Following is my 
gcc build options

For the rtos global cflags:
cflags 
= -Wall -Wpointer-arith -Wstrict-prototypes -Winline -Wundef -Woverloaded-virtual
-g -O2 -ffunction-sections -fdata-sections -fno-rtti -fno-exceptions -fvtable-gc 
 -finit-priority

For the rtos global link flags:
ldflags 
= -Wall -Wpointer-arith -Wstrict-prototypes -Winline -Wundef -Woverloaded-virtual
 -g -O2 -ffunction-sections -fdata-sections -fno-rtti -fno-exceptions -fvtable-gc 
 -finit-priority

For my asm code
cflags = -I$(INSTALL_DIR)/include -msoft-float -O2 -g -Wall -Q
ldflags 
= -L$(INSTALL_DIR)/lib -Ttarget.ld -nostdlib -g -Wl,--gc-sections -Wl,-static 
 -Q

Plus my platform is gcc 3.2.3 and gdb 6.4 on cygwin

Thanks for your reply.

Regards,
Tony

----- Original Message ----- 
From: "Daniel Jacobowitz" <drow@false.org>
To: "Yi Tang" <yitang@itee.uq.edu.au>
Cc: <gdb@sourceware.org>
Sent: Wednesday, November 07, 2007 12:02 AM
Subject: Re: asm debug problem


> On Tue, Nov 06, 2007 at 11:48:59PM +1000, Yi Tang wrote:
>> Hello maintainer,
>>
>> I have got some trouble using gdb for my source code.
>>
>> My code, written in asm and compiled by gcc, should be attached to an 
>> rtos
>> library (ecos) to perform some test. I found it is not possible to debug 
>> the
>> assemble source code. My assemble code, to build the function
>> (usr_interrupt_vsr()),  is in a separate file called uivsr.S. And it is 
>> linked
>> to the OS through a head file. However, when I run the gdb, it goes to 
>> some
>> other file in OS kernel, the clock.cxx (also wrong line num, I'm pretty 
>> sure no
>> such function in this file). And the language is set to C++. I also tried 
>> gas
>> as assembler, same situation.
>
> Did you assemble the file with -g to gcc, or --gdwarf2 to gas?
>
> -- 
> Daniel Jacobowitz
> CodeSourcery
>