[Gdb] setting breakpoint at h8 target

[Erik Källberg]

Hi!

I'm implementing a h8300-stub for remote debugging. 
The target processor is a h8/3334 that does not have
trap instructions and therefore I use an interupt (int 2)
to handle breakpoints. I.e. the breakpoint instruction
is "jsr @@0x0c" which ends up in my breakpoint handler
function. This now works with hardcoded breakpoint (call 
to my breakpoint() function). 

Next thing I want to do is to insert breakpoints from 
gdb at runtime. And this is where my question comes up. 
How do I do this? Do I need to change
the BREAKPOINT or REMOTE_BREAKPOINT definition in 
.../gdb/config/h8300/tm-h8300.h to "jsr @@0x0c" and 
rebuild gdb? Or? 
And is there a way to see what gdb does when I issue
gdb> break function_call
i.e. to see what instruction gdb inserts.

It looks like BREAKPOINT is defined to "sleep" and
REMOTE_BREAKPOINT to "trapa #3".

/Erik