2011-05-06 Sergio Durigan Junior <sergiodj@linux.vnet.ibm.com>

	    Thiago Jung Bauermann  <bauerman@br.ibm.com>

	Implement support for PowerPC BookE masked watchpoints.

gdb/
	* NEWS: Mention masked watchpoint support.  Create "Changed commands"
	section.
	* breakpoint.h (struct breakpoint_ops) <works_in_software_mode>: New
	method.  Initialize to NULL in all existing breakpoint_ops instances.
	(struct breakpoint) <hw_wp_mask>: New field.
	* breakpoint.c (is_masked_watchpoint): Add prototype.
	(update_watchpoint): Don't set b->val for masked watchpoints.  Call
	breakpoint's breakpoint_ops.works_in_software_mode if available.
	(watchpoints_triggered): Handle the case of a hardware masked
	watchpoint trigger.
	(watchpoint_check): Likewise.
	(works_in_software_mode_watchpoint): New function.
	(insert_masked_watchpoint, remove_masked_watchpoint)
	(resources_needed_masked_watchpoint)
	(works_in_software_mode_masked_watchpoint, print_it_masked_watchpoint)
	(print_one_detail_masked_watchpoint, print_mention_masked_watchpoint)
	(print_recreate_masked_watchpoint, is_masked_watchpoint): New
	functions.
	(masked_watchpoint_breakpoint_ops): New structure.
	(watch_command_1): Check for the existence of the `mask' parameter.
	Set b->ops according to the type of hardware watchpoint being created.
	* ppc-linux-nat.c (ppc_linux_insert_mask_watchpoint)
	(ppc_linux_remove_mask_watchpoint)
	(ppc_linux_masked_watch_num_registers): New functions.
	(_initialize_ppc_linux_nat): Initialize to_insert_mask_watchpoint,
	to_remove_mask_watchpoint and to_masked_watch_num_registers.
	* target.c (update_current_target): Mention to_insert_mask_watchpoint,
	to_remove_mask_watchpoint, and to_masked_watch_num_registers.
	(target_insert_mask_watchpoint, target_remove_mask_watchpoint)
	(target_masked_watch_num_registers): New functions.
	* target.h (struct target_ops) <to_insert_mask_watchpoint>,
	<to_remove_mask_watchpoint>, <to_masked_watch_num_registers>: New
	methods.
	(target_insert_mask_watchpoint, target_remove_mask_watchpoint)
	(target_masked_watch_num_registers): Add prototypes.

gdb/doc/
	* gdb.texinfo (Set Watchpoints): Document mask parameter.
	(PowerPC Embedded): Mention support of masked watchpoints.

1 files changed, 8 insertions, 0 deletions

diff --git a/gdb/breakpoint.h b/gdb/breakpoint.h
index 7a9c2d4..7fa705f 100644
--- a/gdb/breakpoint.h
+++ b/gdb/breakpoint.h
@@ -410,6 +410,11 @@ struct breakpoint_ops
      the breakpoint or watchpoint needs one debug register.  */
   int (*resources_needed) (const struct bp_location *);
 
+  /* Tell whether we can downgrade from a hardware watchpoint to a software
+     one.  If not, the user will not be able to enable the watchpoint when
+     there are not enough hardware resources available.  */
+  int (*works_in_software_mode) (const struct breakpoint *);
+
   /* The normal print routine for this breakpoint, called when we
      hit it.  */
   enum print_stop_action (*print_it) (struct breakpoint *);
@@ -651,6 +656,9 @@ struct breakpoint
 
     /* Whether this watchpoint is exact (see target_exact_watchpoints).  */
     int exact;
+
+    /* The mask address for a masked hardware watchpoint.  */
+    CORE_ADDR hw_wp_mask;
   };
 
 typedef struct breakpoint *breakpoint_p;