From: Sam Moore <matches@ucc.asn.au>
Date: Fri, 11 Apr 2014 07:12:30 +0000 (+0800)
Subject: Allow VFPU to save output vcd file
X-Git-Url: https://git.ucc.asn.au/?p=ipdf%2Fcode.git;a=commitdiff_plain;h=7fc41b098090ad2d365ef34700542656947aa8ff

Allow VFPU to save output vcd file

That was amazingly simple.
Can run `gtkwave` on the output vcd file to see all the signals!
---

diff --git a/src/vfpu.cpp b/src/vfpu.cpp
index 2c6d703..85637ff 100644
--- a/src/vfpu.cpp
+++ b/src/vfpu.cpp
@@ -32,7 +32,7 @@ static pid_t g_fpu_pid = -1;
  * Starts the VFPU
  * @returns 0 on success, errno of the failing function on failure
  */
-int Start()
+int Start(const char * vcd_output)
 {
 	assert(!g_running);
 	// create unix socket pair
@@ -59,7 +59,16 @@ int Start()
 
 		Debug("Child about to suppress stderr and exec vfpu");
 		dup2(open("/dev/null", O_APPEND), fileno(stderr)); //LALALA I AM NOT LISTENING TO YOUR STUPID ERRORS GHDL
-		execl(g_fpu, g_fpu,NULL);
+		if (vcd_output != NULL)
+		{
+			string s("--vcd=");
+			s += vcd_output;
+			execl(g_fpu, g_fpu, s.c_str(), NULL);
+		}
+		else	
+		{
+			execl(g_fpu, g_fpu,NULL);
+		}
 		int err = errno; // Because errno will be set again by the next system call
 		Fatal("Uh oh! %s\n", strerror(err)); // We will never see this if something goes wrong... oh dear
 		exit(err); // Child exits here.
diff --git a/src/vfpu.h b/src/vfpu.h
index edf471a..12ac9bc 100644
--- a/src/vfpu.h
+++ b/src/vfpu.h
@@ -9,7 +9,7 @@
 
 namespace VFPU
 {
-	extern int Start(); // Starts the VFPU
+	extern int Start(const char * vcd_output = NULL); // Starts the VFPU
 	extern int Halt(); // Halts the VFPU
 
 /**