[PATCH][3/6] A different KGDB stub

From: Tom Rini
Date: Tue Feb 17 2004 - 17:24:32 EST


The following is the kgdboe driver for this stub.

Makefile | 2
kgdb_eth.c | 160 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 162 insertions(+)
--- linux-2.6.3-rc4/drivers/net/Makefile 2004-02-17 10:06:33.000000000 -0700
+++ linux-2.6.3-rc4-kgdb/drivers/net/Makefile 2004-02-17 11:33:54.693744569 -0700
@@ -188,4 +188,6 @@ obj-$(CONFIG_NET_TULIP) += tulip/
obj-$(CONFIG_HAMRADIO) += hamradio/
obj-$(CONFIG_IRDA) += irda/

+# Netpoll users must be last.
obj-$(CONFIG_NETCONSOLE) += netconsole.o
+obj-$(CONFIG_KGDB_ETH) += kgdb_eth.o
--- linux-2.6.3-rc4/drivers/net/kgdb_eth.c 1969-12-31 17:00:00.000000000 -0700
+++ linux-2.6.3-rc4-kgdb/drivers/net/kgdb_eth.c 2004-02-17 11:34:07.216902332 -0700
@@ -0,0 +1,162 @@
+/*
+ * 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 */
+
+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 kgdb_get_debug_char(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 kgdb_flush_io(void)
+{
+ if(out_count && np.dev) {
+ netpoll_send_udp(&np, out_buf, out_count);
+ out_count = 0;
+ memset(out_buf, 0, sizeof(out_buf));
+ }
+}
+
+void kgdb_put_debug_char(int chr)
+{
+ out_buf[out_count++] = chr;
+ if(out_count == OUT_BUF_SIZE)
+ kgdb_flush_io();
+}
+
+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 (!kgdb_connected) or break in
+ * (msg[0] == 3) ? */
+ if (!netpoll_trap() && (!kgdb_connected || msg[0] == 3)) {
+ netpoll_set_trap(0);
+ kgdb_schedule_breakpoint();
+ }
+
+ for (i = 0; i < len; i++) {
+ 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);
+
+int kgdb_hook_io(void)
+{
+ /* Un-initalized, don't go further. */
+ if (kgdboe != 1)
+ return 1;
+ return 0;
+}
+
+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;
+
+ kgdboe = 1;
+ printk(KERN_INFO "kgdb: debugging over ethernet enabled\n");
+
+ return 0;
+}
+
+module_init(init_kgdboe);

--
Tom Rini
http://gate.crashing.org/~trini/
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