Adding backtrace to an arm-based on-target debugger

[Nagender Telkar <ntelkar at gmail dot com>]

Hello All,

I am working on developing an on-target debugger for applications on
an arm-based target. I need to add a backtrace feature to it.

Can someone tell me where to look for the gdb serial protocol?

When I do a "bt" on the gdb prompt I get only the current frame. It
does not go beyond the current frame. It is as shown below.

#0  Test_Func(nValue=525, psValueBuf=0xb00f0c,
Sending packet: $mb00ee0,4#89...Ack
Packet received: 14000000
   nValueBufSize=20) at et_amountctl.c:390
#1  0x00d4b9e4 in ?? ()

Can you tell me what do I need to do in the target-side stub?

In my target, the application I am debugging is compiled in
arm-elf-gcc but the enviornment it is running is compiled in armcc
mode. Is it a matter of concern to the gdb?

Thanks in advance.

regards,
Nagender