Re: [PATCH] tracepoint: add new trace command "printf"[1] gdbserver

[Hui Zhu <teawater@gmail.com>]

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On Thu, Feb 17, 2011 at 16:16, Hui Zhu <teawater@gmail.com> wrote:
> On Sat, Feb 12, 2011 at 05:31, Tom Tromey <tromey@redhat.com> wrote:
>>>>>>> ">" == Hui Zhu <teawater@gmail.com> writes:
>>
>>>> To make the gdbserver support %s.
>>
>> Oops, I missed this when reviewing your earlier patch.
>> Sorry about that.
>>
>>>> +int
>>>> +tp_printf(const char *format, ...)
>>
>> Space before open paren.
>>
>>>> +  va_end(ap);
>>
>> Likewise.
>>
>>>> +        argv = (void *)(unsigned long)top;
>>
>> Spacing.
>>
>> There are several more spacing bugs, please fix them all.
>>
>> I didn't go read the other patch to try to deduce the format of the
>> printf opcode to see if it all makes sense.  Documentation would help.
>>
>> Tom
>>
>
> Hi Tom,
>
> I make a new patch according to your comments.
>
> Thanks,
> Hui
>
> 2011-02-17  Hui Zhu  <teawater@gmail.com>
>
>        * tracepoint.c (gdb_agent_op): Add gdb_agent_op_printf.
>        (gdb_agent_op_names): Add "printf".
>        (tp_printf): New function.
>        (eval_agent_expr): Handle gdb_agent_op_printf.
>

Checked in.

Thanks,
Hui

2011-02-21  Hui Zhu  <teawater@gmail.com>

	* tracepoint.c (tp_printf): New function.
	(eval_agent_expr): Handle gdb_agent_op_printf.

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---
 gdbserver/tracepoint.c |   44 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)

--- a/gdbserver/tracepoint.c
+++ b/gdbserver/tracepoint.c
@@ -4214,6 +4214,16 @@ gdb_agent_op_name (int op)
   return gdb_agent_op_names[op];
 }
 
+int
+tp_printf (const char *format, ...)
+{
+  va_list ap;
+  va_start (ap, format);
+  vprintf (format, ap);
+  va_end (ap);
+  return 0;
+}
+
 /* The agent expression evaluator, as specified by the GDB docs. It
    returns 0 if everything went OK, and a nonzero error code
    otherwise.  */
@@ -4573,6 +4583,40 @@ eval_agent_expr (struct tracepoint_hit_c
 	  agent_tsv_read (tframe, arg);
 	  break;
 
+	case gdb_agent_op_printf:
+	  {
+	    void *argv;
+	    arg = aexpr->bytes[pc++];
+	    argv = (void *) (unsigned long) top;
+	    if (--sp >= 0)
+	      top = stack[sp];
+
+	    if (arg)
+	      {
+		if (strstr ((char *) (aexpr->bytes + pc), "%s"))
+		  {
+		    int			i;
+		    unsigned char	buf[100];
+
+		    for (i = 0; i < 100; i++)
+		      {
+			agent_mem_read (tframe, buf + i,
+					(CORE_ADDR) ((unsigned long)argv + i),
+					1);
+			if (!buf[i])
+			  break;
+		      }
+		    tp_printf ((char *) (aexpr->bytes + pc), buf);
+		  }
+		else
+	          tp_printf ((char *) (aexpr->bytes + pc), argv);
+	      }
+	    else
+	      tp_printf ((char *) (aexpr->bytes + pc));
+	    pc += strlen ((char *) aexpr->bytes + pc) + 1;
+	  }
+	  break;
+
 	  /* GDB never (currently) generates any of these ops.  */
 	case gdb_agent_op_float:
 	case gdb_agent_op_ref_float: