* breakpoint.h (enum bptype): Add bp_hardware_watchpoint and

bp_watchpoint_scope breakpoints.
	(struct breakpoint): Add val_chain and related_breakpoint fields
	for use by watchpoints.

	* breakpoint.c (within_scope): Delete.  No longer used.
	(TARGET_CAN_USE_HARDWARE_WATCHPOINT): Provide default definition.
	(target_{remove,insert}_watchpoint): Likewise.
	(can_use_hardware_watchpoint): New function.
	(remove_breakpoint): New function to remove a single breakpoint
	or hardware watchpoint.
	(insert_breakpoints): Handle insertion of hardware watchpoints.
	Store a copy of the value chain derived from the watchpoint
	expression.
	(remove_breakpoints): Simplify by using remove_breakpoint.
	(delete_breakpoint): Likewise.
	(watchpoint_check): Delete the watchpoint and watchpoint scope
	breakpoints when the watchpoint goes out of scope.  Save & restore
	the current frame after checking watchpoints.
	(breakpoint_init_inferior): Likewise (restarting the program
	makes all local watchpoints go out of scope).
	(bpstat_stop_status): Handle hardware watchpoints much like normal
	watchpoints. Delete the watchpoint and watchpoint scope breakpoint
	when the watchpoint goes out of scope.  Remove and reinsert all
	breakpoints before returning if we stopped when a hardware watchpoint
	fired.
	(watch_command): Use a hardware watchpoint when possible.  If
	watching a local expression, build a scope breakpoint too.
	(map_breakpoint_numbers): Also call given function for any
	related breakpoints.
	(disable_breakpoint): Never disable a scope breakpoint.
	(enable_breakpoint): Handle hardware breakpoints much like normal
	breakpoints, but recompute the watchpoint_scope breakpoint's
	frame and address  (if we have an associated scope breakpoint).
	(read_memory_nobpt): Handle hardware watchpoints like normal
	watchpoints.  When necessary handle watchpoint_scope breakpoints.
	(print_it_normal, bpstat_what, breakpoint_1, mention): Likewise.
	(clear_command, breakpoint_re_set_one, enable_command): Likewise.
	(disable_command): Likewise.

	* blockframe.c (find_frame_addr_in_frame_chain): New function.
	Extern prototype added to frame.h

	* infrun.c (wait_for_inferior): Set current_frame and select
	a frame before checking if we stopped due to a hardare watchpoint
	firing.  Handle stepping over hardware watchpoints.
	(normal_stop): Remove unnecessary call to select_frame.

	* value.h (value_release_to_mark): Declare.
	* values.c (value_release_to_mark): New function.

	* procfs.c (procfs_wait): Add cases for hardware watchpoints.
	(procfs_set_watchpoint, procfs_stopped_by_watchpoint): New functions.

	* hppab-nat.c (hppa_set_watchpoint): New function.

	* config/pa/nm-hppab.h (STOPPED_BY_WATCHPOINT): Define.
	(HAVE_STEPPABLE_WATCHPOINT): Define.
	(TARGET_CAN_USE_HARDWARE_WATCHPOINT): Define.
	(target_{insert,delete}_watchpoint): Define.

gdb/procfs.c

@@ -2321,6 +2321,10 @@ wait_again:
 	      break;
 	    case FLTBPT:
 	    case FLTTRACE:
+	      statval = (SIGTRAP << 8) | 0177;
+	      break;	      
+	    case FLTWATCH:
+	    case FLTKWATCH:
 	      statval = (SIGTRAP << 8) | 0177;
 	      break;
 	    case FLTSTACK:
@@ -3528,6 +3532,56 @@ procfs_can_run ()
 {
   return(1);
 }
+
+/* Insert a watchpoint */
+int
+procfs_set_watchpoint(pid, addr, len, rw)
+     int		pid;
+     CORE_ADDR		addr;
+     int		len;
+     int		rw;
+{
+  struct procinfo	*pi;
+  prwatch_t		wpt;
+
+  pi = find_procinfo (pid == -1 ? inferior_pid : pid, 0);
+  wpt.pr_vaddr = (caddr_t)addr;
+  wpt.pr_size = len;
+  wpt.pr_wflags = ((rw & 1) ? MA_READ : 0) | ((rw & 2) ? MA_WRITE : 0);
+  if (ioctl (pi->fd, PIOCSWATCH, &wpt) < 0)
+    {
+      if (errno == E2BIG)
+	return -1;
+      /* Currently it sometimes happens that the same watchpoint gets
+	 deleted twice - don't die in this case (FIXME please) */
+      if (errno == ESRCH && len == 0)
+	return 0;
+      print_sys_errmsg (pi->pathname, errno);
+      error ("PIOCSWATCH failed");
+    }
+  return 0;
+}
+
+int
+procfs_stopped_by_watchpoint(pid)
+    int			pid;
+{
+  struct procinfo	*pi;
+  short 		what;
+  short 		why;
+
+  pi = find_procinfo (pid == -1 ? inferior_pid : pid, 0);
+  if (pi->prstatus.pr_flags & (PR_STOPPED | PR_ISTOP))
+    {
+      why = pi->prstatus.pr_why;
+      what = pi->prstatus.pr_what;
+      if (why == PR_FAULTED 
+	  && (what == FLTWATCH) || (what == FLTKWATCH))
+	return what;
+    }
+  return 0;
+}
+
 
 struct target_ops procfs_ops = {
   "procfs",			/* to_shortname */