Implement "to_stopped_by_hw_breakpoint" for x86 debug registers.

Report that a thread is stopped by a hardware breakpoint if a non-data
watchpoint is set in DR6.  This change should be a no-op since a target
still needs to implement the "to_supports_stopped_by_hw_breakpoint"
method before this function is used.

gdb/ChangeLog:

	* nat/x86-dregs.c (x86_dr_stopped_by_hw_breakpoint): New function.
	* nat/x86-dregs.h (x86_dr_stopped_by_hw_breakpoint): New
	prototype.
	* x86-nat.c (x86_stopped_by_hw_breakpoint): New function.
	(x86_use_watchpoints): Set "stopped_by_hw_breakpoint" target
	method.

1 files changed, 17 insertions, 0 deletions

diff --git a/gdb/x86-nat.c b/gdb/x86-nat.c
index b126c47..bec5137 100644
--- a/gdb/x86-nat.c
+++ b/gdb/x86-nat.c
@@ -260,6 +260,18 @@ x86_can_use_hw_breakpoint (struct target_ops *self,
   return 1;
 }
 
+/* Return non-zero if the inferior has some breakpoint that triggered.
+   Otherwise return zero.  */
+
+static int
+x86_stopped_by_hw_breakpoint (struct target_ops *ops)
+{
+  struct x86_debug_reg_state *state
+    = x86_debug_reg_state (ptid_get_pid (inferior_ptid));
+
+  return x86_dr_stopped_by_hw_breakpoint (state);
+}
+
 static void
 add_show_debug_regs_command (void)
 {
@@ -297,6 +309,11 @@ x86_use_watchpoints (struct target_ops *t)
   t->to_remove_watchpoint = x86_remove_watchpoint;
   t->to_insert_hw_breakpoint = x86_insert_hw_breakpoint;
   t->to_remove_hw_breakpoint = x86_remove_hw_breakpoint;
+
+  /* A target must provide an implementation of the
+     "to_supports_stopped_by_hw_breakpoint" target method before this
+     callback will be used.  */
+  t->to_stopped_by_hw_breakpoint = x86_stopped_by_hw_breakpoint;
 }
 
 void