Re: [discuss] Re: kgdb for x86_64 2.6 kernels

[Pavel Machek]

Hi!

> Well said!
> 
> I have released kgdb 2.0.1 for kernel 2.6.1:
> http://kgdb.sourceforge.net/linux-2.6.1-kgdb-2.0.1.tar.bz2
> 
> It doesn't contain any assert stuff. I have split it into multiple parts to 
> make a merge easier. Please let me know if you want me to further split them 
> or if you want something to be changed. The README file from this tarball is 
> pasted below.
> 
> Here is two possible starting points:
> 1. SMP stuff -> Replace my old smp and nmi handling code.
> 2. Early boot -> Change 8250.patch to make configuration of serial port either 
> through config options or through command line.
> 
> I'll attempt reading your patch and merging as much stuff as
> possible.

Fix round of changes:

* kgdbeth_opt does not initialize ipaddrptr -> this could not have
ever worked. [Okay, it still does not work].

* Add some basic documentation

* reply_arp can be static, AFAICS

* getDebugChar() no longer exists, kill it from the docs, read_char()
should be equivalent.

* eth_PutDebugChar() seems to be no longer used. Kill it.

Please apply,
									Pavel


--- tmp/linux/drivers/net/kgdb_eth.c	2004-01-10 20:16:10.000000000 +0100
+++ linux/drivers/net/kgdb_eth.c	2004-01-10 20:10:27.000000000 +0100
@@ -72,8 +72,7 @@
 read_char(void)
 {
 	/* intr routine has queued chars */
-	if (atomic_read(&kgdb_buf_in_cnt) != 0)
-	{
+	if (atomic_read(&kgdb_buf_in_cnt) != 0) {
 		int chr;
 
 		chr = kgdb_buf[kgdb_buf_out_inx++] ;
@@ -150,8 +149,6 @@
 	kgdb_netdevice->hard_start_xmit(skb, kgdb_netdevice);
 	kgdb_netdevice->xmit_lock_owner = -1;
 	spin_unlock(&kgdb_netdevice->xmit_lock);
-
-	/* kfree_skb(skb); */
 }
 
 static void kgdbeth_flush(void)
@@ -179,7 +176,7 @@
 
 static struct sk_buff *send_skb = NULL;
 
-void
+static void
 kgdb_eth_reply_arp(void)
 {
 	if (send_skb) {
@@ -313,12 +310,12 @@
  * Accept an skbuff from net_device layer and add the payload onto
  * kgdb buffer
  *
- * When the kgdb stub routine getDebugChar() is called it draws characters
+ * When the kgdb stub routine read_char() is called it draws characters
  * out of the buffer until it is empty and then reads directly from the
  * serial port.
  *
  * We do not attempt to write chars from the interrupt routine since
- * the stubs do all of that via putDebugChar() which writes one byte
+ * the stubs do all of that via write_char() which writes one byte
  * after waiting for the interface to become ready.
  *
  * The debug stubs like to run with interrupts disabled since, after all,
@@ -434,7 +431,7 @@
 }
 
 /*
- * getDebugChar
+ * kgdbeth_read_char
  *
  * This is a GDB stub routine.  It waits for a character from the
  * serial interface and then returns it.  If there is no serial
@@ -455,42 +452,6 @@
 	return chr;
 }
 
-#define ETH_QUEUE_SIZE 256
-static char eth_queue[ETH_QUEUE_SIZE];
-static int outgoing_queue;
-
-void
-eth_flushDebugChar(void)
-{
-	if(outgoing_queue) {
-		write_buffer(eth_queue, outgoing_queue);
-
-		outgoing_queue = 0;
-	}
-}
-
-static void
-put_char_on_queue(int chr)
-{
-	eth_queue[outgoing_queue++] = chr;
-	if(outgoing_queue == ETH_QUEUE_SIZE)
-	{
-		eth_flushDebugChar();
-	}
-}
-
-/*
- * eth_putDebugChar
- *
- * This is a GDB stub routine.  It waits until the interface is ready
- * to transmit a char and then sends it.
- */
-void
-eth_putDebugChar(int chr)
-{
-	put_char_on_queue(chr); /* this routine will wait */
-}
-
 static void kgdbeth_begin_session(void)
 {
 	kgdbeth_is_trapped = 1;
@@ -546,7 +507,7 @@
 static int __init kgdbeth_opt(char *str)
 {
 	char ipaddrstr[16];
-	char *ipaddrptr;
+	char *ipaddrptr = ipaddrstr;
 
 	/* interfacenum */
 	if (*str < '0' || *str > '9')
--- /dev/null	2003-09-12 10:38:14.000000000 +0200
+++ linux/Documentation/kgdb/kgdb_eth.txt	2004-01-10 19:53:37.000000000 +0100
@@ -0,0 +1,10 @@
+Some notes about kgdb over ethernet
+
+ 2004 Pavel Machek <pavel@xxxxxxx>
+
+
+kgdbeth=interfacenum,localmac,listenport,remoteip,remotemac
+
+Then
+   % gdb ./vmlinux
+   (gdb) target remote udp:HOSTNAME:6443



-- 
When do you have a heart between your knees?
[Johanka's followup: and *two* hearts?]
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