[gdbserver/rfa] CRIS/CRISv32 gdbserver support (part 2)

[Orjan Friberg]

Daniel Jacobowitz wrote:
> 
> - cris and crisv32 appear to have, from point of view of gdbserver, not
> much more in common than cris and mips.  How about having
> linux-crisv32-low.c instead?  There can be additional file for common
> code if it becomes necessary in the future.

Good idea; I split them up as suggested.

>>static CORE_ADDR
>>cris_reinsert_addr ()
>>{
>>  unsigned long pc;
>>  collect_register_by_name ("srp", &pc);
>>  return pc;
>>}
> 
> 
> I gather that you don't have PTRACE_SINGLESTEP on cris; not even on
> crisv32?

On CRISv32 I do; thanks for catching this (I removed reinsert_addr for CRISv32).

>>#ifdef __arch_v32
>>void
>>cris_write_data_breakpoint (int bp, unsigned long start, unsigned long end)
>>{
>>  switch (bp)
>>    {
>>    case 0:
>>      supply_register_by_name("s3", &start);
>>      supply_register_by_name("s4", &end);
>>      break;
> 
> 
> What to do about the threaded case?  GDB is having so much trouble
> getting it right that I'd like to make sure gdbserver does from the
> start.
> 
> I guess this can be handled completely in the linux-low wrapper
> functions by switching the current thread and setting watchpoints for
> each.  I think that is correct for all Linux targets using hardware
> watchpoints, because of the nature of Linux threading.

For CRISv32, there might be an additional problem lurking in the shadows: we 
treat the watchpoint registers as global (i.e., only one process at a time can 
use them, and thus they are not saved/restored on context switches etc).

Anyway, is this something you want resolved before I commit the CRIS/CRISv32 
support?  (Here's an updated ChangeLog entry and updated patches if not.)

2005-02-01  Orjan Friberg  <orjanf@axis.com>

	* linux-cris-low.c: New file with support for CRIS.
	* linux-crisv32-low.c: Ditto for CRISv32.
	* Makefile.in (SFILES): Add linux-cris-low.c, linux-crisv32-low.c.
	(clean): Add reg-cris.c and reg-crisv32.c.
	Add linux-cris-low.o, linux-crisv32-low.o, reg-cris.o, reg-cris.c,
	reg-crisv32.o, and reg-crisv32.c to make rules.
	* configure.srv: Add cris-*-linux* and crisv32-*-linux* to list of
	recognized targets.

-- 
Orjan Friberg
Axis Communications

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