Is there any way to set a breakpoint in gdb that is conditional on the call stack?

Question

I am debugging C++ in gdb 7.1 on Linux.

I have a function a() that is called in many places in the code. I want to set a breakpoint in it, but only if

Answer 1

An easy one for arm is:

Set the breakpoint in the function you are interested.

break a

Attach an gdb command to that breakpoint.

command 1
 up 1
 if $lr == 0x12345678
  echo match \n
  down 1
 else
  echo no match \n
  echo $lr \n
  down 1
  cont 
 end 
end 

When ever you arrive in the function a(), the command temporarily pops up one stack frame thus updating the link register. The callers link register value can then be used continue when the caller is not the execution path you need.

Enjoy.