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

[Hui Zhu <teawater@gmail.com>]

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This patch is for the gdbserver.

2011-01-04  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.

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---
 gdbserver/tracepoint.c |   28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

--- a/gdbserver/tracepoint.c
+++ b/gdbserver/tracepoint.c
@@ -515,6 +515,7 @@ enum gdb_agent_op
     gdb_agent_op_setv = 0x2d,
     gdb_agent_op_tracev = 0x2e,
     gdb_agent_op_trace16 = 0x30,
+    gdb_agent_op_printf = 0x31,
     gdb_agent_op_last
   };
 
@@ -569,6 +570,7 @@ static const char *gdb_agent_op_names [g
     "tracev",
     "?undef?",
     "trace16",
+    "printf",
   };
 
 struct agent_expr
@@ -4288,6 +4290,16 @@ unparse_agent_expr (struct agent_expr *a
 
 #endif
 
+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.  */
@@ -4630,6 +4642,22 @@ 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 *)top;
+	    if (--sp >= 0)
+	      top = stack[sp];
+
+	    if (arg)
+	      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: