[PATCH 2/2] Global breakpoints, GDBserver

[Stan Shebs <stanshebs at earthlink dot net>]

The GDBserver part of global breakpoints is similar to GDB's linux-nat.c 
code, although I'm not sure we have enough infrastructure yet to be able 
to share the code.

We also need a hook for GDB disconnection, so that GDBserver can close 
the breakpoint device, which in turn triggers the clearing of traps and 
other any paraphernalia associated with the ended GDB session; the 
breakpoint device needs to be careful that it only maintain global 
breakpoints as long as there is a GDB to notify of hits.

(Also I didn't mention it in the introduction, but I'm not wild about 
"global breakpoint" as a term for all this, not least because there is a 
"global breakpoint" property in gdbarch, which is sort-of related, but 
an entirely different code path.  "Multi-process breakpoint" is an 
awkward mouthful but perhaps more accurate.)

Stan
stan@codesourcery.com

2011-06-13  Stan Shebs <stan@codesourcery.com>

    * target.h (target_ops): Add define_global_breakpoint,
    insert_global_breakpoint, delete_global_breakpoint,
    host_disconnected.
    * server.c (handle_general_set): Add handling for QGBreak* packets.
    (handle_query): Report that global breakpoints are supported.
    (main): Call host_disconnected hook.
    * linux-low.c (BREAKPOINT_DEVICE): New macro.
    (MAX_GB_PACKET): New macro.
    (gbfd): New global.
    (gbcount): New global.
    (open_gb_device): New function.
    (close_gb_device): New function.
    (tohex): New function.
    (linux_handle_breakpoint_hit): New function.
    (linux_record_breakpoint): New function.
    (get_gb_reply): New function.
    (linux_define_global_breakpoint): New function.
    (linux_insert_global_breakpoint): New function.
    (linux_delete_global_breakpoint): New function.
    (linux_target_op): Add them, plus set host_disconnected.
    (gb_event_handler): New function.

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