Re: [patch] gdbserver: Add support for Z0/Z1 packets

[Aleksandar Ristovski <aristovski@qnx.com>]

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Pedro Alves wrote:
> On Monday 22 June 2009 20:38:50, Aleksandar Ristovski wrote:
> 
>>> Z0 and Z1 breakpoints also take a 'len' argument, just
>>> like Z2-Z4.  You should also pass those down.
>>>
>>> But, Let's take a step back --- why not just rename the
>>> insert_watchpoint|remove_watchpoint functions to insert_point,remove_point,
>>> and relax the type checks in server.c:
>> That was my initial implementation, prior to proposing the 
>> change. Then I looked at target ops in gdb; there we have 
>> two different functions for breakpoint and watchpoint so I 
>> followed that logic (even though the logic there seems to be 
>> incomplete: there is a pair for hw and non-hw breakponts but 
>> only one pair for watchpoints).
> 
> That's because software watchpoints aren't "inserted".

Yes, silly me.

> 
>> But either way is fine with me - just let me know.
> 
> I'd prefer the approach I suggested, and worry about splitting
> the breakpoints from watchpoints API if/when we actually need it.
> 

Ok, then that version is committed.

I attached what I committed.

ChangeLog:

* server.c (process_serial_event): Add support for Z0 and Z1 
packet.
* target.h: Comment for *_watchpoint to make it clear the 
functions
can get types '0' and '1'.



Thanks,

-- 
Aleksandar Ristovski
QNX Software Systems


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Index: server.c
===================================================================
RCS file: /cvs/src/src/gdb/gdbserver/server.c,v
retrieving revision 1.98
diff -u -p -r1.98 server.c
--- server.c	19 Jun 2009 13:35:35 -0000	1.98
+++ server.c	23 Jun 2009 15:06:21 -0000
@@ -2371,66 +2371,56 @@ process_serial_event (void)
       signal = 0;
       myresume (own_buf, 1, signal);
       break;
-    case 'Z':
+    case 'Z':  /* insert_ ... */
+      /* Fallthrough.  */
+    case 'z':  /* remove_ ... */
       {
 	char *lenptr;
 	char *dataptr;
 	CORE_ADDR addr = strtoul (&own_buf[3], &lenptr, 16);
 	int len = strtol (lenptr + 1, &dataptr, 16);
 	char type = own_buf[1];
+	int res;
+	const int insert_ = ch == 'Z';
+
+	/* Type: '0' - software-breakpoint
+		 '1' - hardware-breakpoint
+		 '2' - write watchpoint
+		 '3' - read watchpoint
+		 '4' - access watchpoint  */
 
 	if (the_target->insert_watchpoint == NULL
-	    || (type < '2' || type > '4'))
-	  {
-	    /* No watchpoint support or not a watchpoint command;
-	       unrecognized either way.  */
-	    own_buf[0] = '\0';
-	  }
+	    || the_target->remove_watchpoint == NULL)
+	  res = 1;  /* Not supported.  */
 	else
-	  {
-	    int res;
-
-	    require_running (own_buf);
-	    res = (*the_target->insert_watchpoint) (type, addr, len);
-	    if (res == 0)
-	      write_ok (own_buf);
-	    else if (res == 1)
-	      /* Unsupported.  */
-	      own_buf[0] = '\0';
-	    else
-	      write_enn (own_buf);
-	  }
-	break;
-      }
-    case 'z':
-      {
-	char *lenptr;
-	char *dataptr;
-	CORE_ADDR addr = strtoul (&own_buf[3], &lenptr, 16);
-	int len = strtol (lenptr + 1, &dataptr, 16);
-	char type = own_buf[1];
+	  switch (type)
+	    {
+	    case '2':
+	      /* Fallthrough.  */
+	    case '3':
+	      /* Fallthrough.  */
+	    case '4':
+	      require_running (own_buf);
+	      /* Fallthrough.  */
+	    case '0':
+	      /* Fallthrough.  */
+	    case '1':
+	      res = insert_ ? (*the_target->insert_watchpoint) (type, addr,
+								len)
+			    : (*the_target->remove_watchpoint) (type, addr,
+								len);
+	      break;
+	    default:
+	      res = -1; /* Unrecognized type.  */
+	    }
 
-	if (the_target->remove_watchpoint == NULL
-	    || (type < '2' || type > '4'))
-	  {
-	    /* No watchpoint support or not a watchpoint command;
-	       unrecognized either way.  */
-	    own_buf[0] = '\0';
-	  }
+	if (res == 0)
+	  write_ok (own_buf);
+	else if (res == 1)
+	  /* Unsupported.  */
+	  own_buf[0] = '\0';
 	else
-	  {
-	    int res;
-
-	    require_running (own_buf);
-	    res = (*the_target->remove_watchpoint) (type, addr, len);
-	    if (res == 0)
-	      write_ok (own_buf);
-	    else if (res == 1)
-	      /* Unsupported.  */
-	      own_buf[0] = '\0';
-	    else
-	      write_enn (own_buf);
-	  }
+	  write_enn (own_buf);
 	break;
       }
     case 'k':
Index: target.h
===================================================================
RCS file: /cvs/src/src/gdb/gdbserver/target.h,v
retrieving revision 1.37
diff -u -p -r1.37 target.h
--- target.h	19 Jun 2009 13:35:35 -0000	1.37
+++ target.h	23 Jun 2009 15:06:21 -0000
@@ -216,10 +216,11 @@ struct target_ops
   /* Insert and remove a hardware watchpoint.
      Returns 0 on success, -1 on failure and 1 on unsupported.
      The type is coded as follows:
-       2 = write watchpoint
-       3 = read watchpoint
-       4 = access watchpoint
-  */
+       '0' - software-breakpoint
+       '1' - hardware-breakpoint
+       '2' - write watchpoint
+       '3' - read watchpoint
+       '4' - access watchpoint  */
 
   int (*insert_watchpoint) (char type, CORE_ADDR addr, int len);
   int (*remove_watchpoint) (char type, CORE_ADDR addr, int len);