GDB 6.2 for ARM: bug in backtrace when in Thumb mode

[Thierry <goldy_gnu@yahoo.com>]

Hi there,
 
I'm trying to debug an application compiled for the
ARM in Thumb mode. The 'backtrace' command seems buggy
as soon as there are more than 4 levels in the stack.
Besides, with the same code compiled in ARM mode, it
works perfectly.
 
Here's an example:
 
void dummy2(int a)
{
   int b;
   b = a;
}
 
void dummy1(void)
{
   dummy2(4);
}
 
void dummy(void)
{
   dummy1();
}
 
In my 'main', I call 'dummy()'.

When I go step-by-step until I step into 'dummy2', the
'bt' command gives the following result:
#0  dummy2 (a=4) at MainModule/src/dummy.c:4
#1  0xc000039c in dummy1 () at
MainModule/src/dummy.c:9
#2  0x00000000 in ?? ()
 
which is wrong!
 
The files have been compiled with arm-elf-gcc with the
following options:
-ggdb -gdwarf-2 -c -mapcs -fomit-frame-pointer -mthumb
-mthumb-interwork -mlong-calls
-fsigned-char -mstructure-size-boundary=8
-fshort-enums

When I remove the option '-fomit-frame-pointer', it
works.
 
Any idea?
 
Thanks in advance for your help,
 
 Thierry



	
		
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