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Date: Fri, 27 Feb 2004 14:32:54 -0700
From: Tom Rini <trini@kernel.crashing.org>
To: Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Pavel Machek <pavel@suse.cz>, "Amit S. Kale" <amitkale@emsyssoft.com>,
       kgdb-bugreport@lists.sourceforge.net
Subject: [KGDB PATCH][3/7] SysRq-G
Message-ID: <20040227213254.GE1052@smtp.west.cox.net>
References: <20040227212301.GC1052@smtp.west.cox.net> <20040227212548.GD1052@smtp.west.cox.net>
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Hello.  The following adds SysRq-G.  This is always configured in on
CONFIG_KGDB && CONFIG_SYSRQ.

diff -zrupN linux-2.6.3+config+serial/drivers/char/sysrq.c linux-2.6.3+config+serial+sysrq+arch_hooks/drivers/char/sysrq.c
--- linux-2.6.3+config+serial/drivers/char/sysrq.c	2004-02-27 12:06:22.000000000 -0700
+++ linux-2.6.3+config+serial+sysrq+arch_hooks/drivers/char/sysrq.c	2004-02-27 12:16:14.000000000 -0700
@@ -31,6 +31,7 @@
 #include <linux/suspend.h>
 #include <linux/writeback.h>
 #include <linux/buffer_head.h>		/* for fsync_bdev() */
+#include <linux/kgdb.h>			/* for breakpoint() */
 
 #include <linux/spinlock.h>
 
@@ -44,6 +45,25 @@ int sysrq_enabled = 1;
 /* Machine specific power off function */
 void (*sysrq_power_off)(void);
 
+/* Make a breakpoint() right now. */
+#ifdef CONFIG_KGDB
+#define  GDB_OP &kgdb_op
+static void kgdb_sysrq(int key, struct pt_regs *pt_regs, struct tty_struct *tty)
+{
+	printk("kgdb sysrq\n");
+	breakpoint();
+}
+
+static struct sysrq_key_op kgdb_op = {
+	.handler	= kgdb_sysrq,
+	.help_msg	= "kGdb|Fgdb",
+	.action_msg	= "Debug breakpoint\n",
+};
+
+#else
+#define  GDB_OP NULL
+#endif
+
 /* Loglevel sysrq handler */
 static void sysrq_handle_loglevel(int key, struct pt_regs *pt_regs,
 				  struct tty_struct *tty) 
@@ -239,7 +259,7 @@ static struct sysrq_key_op *sysrq_key_ta
 /* d */	NULL,
 /* e */	&sysrq_term_op,
 /* f */	NULL,
-/* g */	NULL,
+/* g */	GDB_OP,
 /* h */	NULL,
 /* i */	&sysrq_kill_op,
 /* j */	NULL,

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