3/3 kgdb over netpoll

From: Pavel Machek
Date: Sun Feb 22 2004 - 11:39:09 EST


Hi!

This is kgdb-over-ethernet patch. Depends on netpoll, and is somehow
experimental.
Pavel

Index: linux-2.6.3-kgdb/drivers/net/Kconfig
===================================================================
--- linux-2.6.3-kgdb.orig/drivers/net/Kconfig 2004-02-19 13:35:52.000000000 +0530
+++ linux-2.6.3-kgdb/drivers/net/Kconfig 2004-02-19 14:09:33.854280848 +0530
@@ -187,6 +187,12 @@
Note that the answer to this question won't directly affect the
kernel: saying N will just cause the configurator to skip all
the questions about Ethernet network cards. If unsure, say N.
+
+config KGDB_ETH
+ bool "KGDB: On ethernet"
+ depends on KGDB
+ help
+ Uses ethernet interface for kgdb.

config MII
tristate "Generic Media Independent Interface device support"
Index: linux-2.6.3-kgdb/drivers/net/kgdb_eth.c
===================================================================
--- linux-2.6.3-kgdb.orig/drivers/net/kgdb_eth.c 2003-01-30 15:54:37.000000000 +0530
+++ linux-2.6.3-kgdb/drivers/net/kgdb_eth.c 2004-02-19 14:09:33.854280848 +0530
@@ -0,0 +1,170 @@
+/*
+ * Network interface GDB stub
+ *
+ * Copyright (C), 2004 Amit S. Kale
+ *
+ * Written by San Mehat (nettwerk@xxxxxxxxxxx)
+ * Based upon 'gdbserial' by David Grothe (dave@xxxxxxxx)
+ * and Scott Foehner (sfoehner@xxxxxxxxxxxx)
+ *
+ * Twiddled for 2.6 by Robert Walsh <rjwalsh@xxxxxxxxxxxx>
+ * and wangdi <wangdi@xxxxxxxxxxxxx>.
+ *
+ * Restructured for generic a gdb interface
+ * Reveral changes to make it free of device driver changes.
+ * Added internal buffers for this interface.
+ * by Amit S. Kale <amitkale@xxxxxxxxxxxxx>
+ *
+ * Refactored for netpoll API by Matt Mackall <mpm@xxxxxxxxxxx>
+ *
+ * Some cleanups by Pavel Machek <pavel@xxxxxxx>
+ */
+
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+#include <linux/interrupt.h>
+#include <linux/config.h>
+#include <linux/major.h>
+#include <linux/string.h>
+#include <linux/fcntl.h>
+#include <linux/termios.h>
+#include <linux/kgdb.h>
+#include <linux/if_ether.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/delay.h>
+#include <linux/irq.h>
+#include <linux/inet.h>
+#include <linux/notifier.h>
+#include <linux/netpoll.h>
+
+#include <net/tcp.h>
+#include <net/udp.h>
+
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/segment.h>
+#include <asm/bitops.h>
+#include <asm/system.h>
+#include <asm/atomic.h>
+
+#define IN_BUF_SIZE 512 /* power of 2, please */
+#define OUT_BUF_SIZE 30 /* We don't want to send too big of a packet. */
+
+static char in_buf[IN_BUF_SIZE], out_buf[OUT_BUF_SIZE];
+static int in_head, in_tail, out_count;
+static atomic_t in_count;
+int kgdboe = 0; /* Default to tty mode */
+
+extern void breakpoint(void);
+static void rx_hook(struct netpoll *np, int port, char *msg, int len);
+
+static struct netpoll np = {
+ .name = "kgdboe",
+ .dev_name = "eth0",
+ .rx_hook = rx_hook,
+ .local_port = 6443,
+ .remote_port = 6442,
+ .remote_mac = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff},
+};
+
+int eth_getDebugChar(void)
+{
+ int chr;
+
+ while (atomic_read(&in_count) == 0)
+ netpoll_poll(&np);
+
+ chr = in_buf[in_tail++];
+ in_tail &= (IN_BUF_SIZE - 1);
+ atomic_dec(&in_count);
+ return chr;
+}
+
+void eth_flushDebugChar(void)
+{
+ if(out_count && np.dev) {
+ netpoll_send_udp(&np, out_buf, out_count);
+ out_count = 0;
+ }
+}
+
+void eth_putDebugChar(int chr)
+{
+ out_buf[out_count++] = chr;
+ if(out_count == OUT_BUF_SIZE)
+ eth_flushDebugChar();
+}
+
+static void rx_hook(struct netpoll *np, int port, char *msg, int len)
+{
+ int i;
+
+ np->remote_port = port;
+
+ /* Is this gdb trying to attach? */
+ if (!netpoll_trap() && len == 8 && !strncmp(msg, "$Hc-1#09", 8))
+ breakpoint();
+
+ for (i = 0; i < len; i++) {
+ if (msg[i] == 3)
+ breakpoint();
+
+ if (atomic_read(&in_count) >= IN_BUF_SIZE) {
+ /* buffer overflow, clear it */
+ in_head = in_tail = 0;
+ atomic_set(&in_count, 0);
+ break;
+ }
+ in_buf[in_head++] = msg[i];
+ in_head &= (IN_BUF_SIZE - 1);
+ atomic_inc(&in_count);
+ }
+}
+
+static int option_setup(char *opt)
+{
+ return netpoll_parse_options(&np, opt);
+}
+
+__setup("kgdboe=", option_setup);
+
+static int hook(void)
+{
+ /* Un-initalized, don't go further. */
+ if (kgdboe != 1)
+ return 1;
+ return 0;
+}
+
+struct kgdb_serial kgdbeth_serial = {
+ .read_char = eth_getDebugChar,
+ .write_char = eth_putDebugChar,
+ .hook = hook,
+ .flush = eth_flushDebugChar,
+};
+
+static int init_kgdboe(void)
+{
+#ifdef CONFIG_SMP
+ if (num_online_cpus() > CONFIG_NO_KGDB_CPUS) {
+ printk("kgdb: too manu cpus. Cannot enable debugger with more than %d cpus\n", CONFIG_NO_KGDB_CPUS);
+ return -1;
+ }
+#endif
+
+ if(!np.remote_ip || netpoll_setup(&np))
+ return 1;
+
+ kgdb_serial = &kgdbeth_serial;
+ kgdboe = 1;
+ printk(KERN_INFO "kgdb: debugging over ethernet enabled\n");
+
+ return 0;
+}
+
+module_init(init_kgdboe);
Index: linux-2.6.3-kgdb/drivers/net/Makefile
===================================================================
--- linux-2.6.3-kgdb.orig/drivers/net/Makefile 2004-02-19 13:35:52.000000000 +0530
+++ linux-2.6.3-kgdb/drivers/net/Makefile 2004-02-19 14:09:33.862279632 +0530
@@ -32,6 +32,8 @@

obj-$(CONFIG_OAKNET) += oaknet.o 8390.o

+obj-$(CONFIG_KGDB_ETH) += kgdb_eth.o
+
obj-$(CONFIG_DGRS) += dgrs.o
obj-$(CONFIG_RCPCI) += rcpci.o
obj-$(CONFIG_VORTEX) += 3c59x.o
Index: linux-2.6.3-kgdb/net/core/dev.c
===================================================================
--- linux-2.6.3-kgdb.orig/net/core/dev.c 2004-02-19 13:35:50.000000000 +0530
+++ linux-2.6.3-kgdb/net/core/dev.c 2004-02-19 14:09:33.879277048 +0530
@@ -1547,7 +1547,6 @@
}
#endif

-
/**
* netif_rx - post buffer to the network code
* @skb: buffer to post
Index: linux-2.6.3-kgdb/net/core/skbuff.c
===================================================================
--- linux-2.6.3-kgdb.orig/net/core/skbuff.c 2004-02-19 13:35:50.000000000 +0530
+++ linux-2.6.3-kgdb/net/core/skbuff.c 2004-02-19 14:09:33.888275680 +0530
@@ -55,6 +55,7 @@
#include <linux/rtnetlink.h>
#include <linux/init.h>
#include <linux/highmem.h>
+#include <linux/debugger.h>

#include <net/protocol.h>
#include <net/dst.h>

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