Re: question software_single_step / breakpoint_from_pc

[Andrew Cagney <ac131313 at cygnus dot com>]

Yes, you've hit a known limitation in the way the current software 
single step interface is implemented. Look for single_step and fixme in 
gdbarch.*.  Patches definitly welcome.

	Andrew



> Hi,
> porting gdb to a new target platform i faced the following problem:
> 
> Scenario: 
> Our target processor itself does not support single step & hardware
> breakpoints.
> But there are two "flavors" of the target system
> 
> 1. simulation which supports hardware breakpoints & single step (feature
> of RTL simulator)
> 
> 2. concrete hardware using a debugger in ROM via serial link. (no
> hardware bp & no single step)
> 
> I wrote one target description file (corename-tdep.c) and two remote_*.c
> driver for the versions mentioned.
> 
> Question: 
> Currently i can only decide that 
> - software single step
> - hardware breakpoints
> are available or not. 
> (decr_pc_after_break also varies depending on hw-breakpoint
> availibility)
> 
> How can i make this dependend on the target connection (remote_*.c)
> driver selected?
> 
> Your answers are greatly appreciated!
> 
> Regards,
> 
> Michael
> -- 
>