kgdb: core changes to support kdb

These are the minimum changes to the kgdb core in order to enable an
API to connect a new front end (kdb) to the debug core.

This patch introduces the dbg_kdb_mode variable controls where the
user level I/O is routed.  It will be routed to the gdbstub (kgdb) or
to the kdb front end which is a simple shell available over the kgdboc
connection.

You can switch back and forth between kdb or the gdb stub mode of
operation dynamically.  From gdb stub mode you can blindly type
"$3#33", or from the kdb mode you can enter "kgdb" to switch to the
gdb stub.

The logic in the debug core depends on kdb to look for the typical gdb
connection sequences and return immediately with KGDB_PASS_EVENT if a
gdb serial command sequence is detected.  That should allow a
reasonably seamless transition between kdb -> gdb without leaving the
kernel exception state.  The two gdb serial queries that kdb is
responsible for detecting are the "?" and "qSupported" packets.

CC: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Acked-by: Martin Hicks <mort@sgi.com>

3 files changed, 150 insertions, 17 deletions

diff --git a/kernel/debug/debug_core.c b/kernel/debug/debug_core.c
index 7e03969..6e1fa82 100644
--- a/kernel/debug/debug_core.c
+++ b/kernel/debug/debug_core.c
@@ -43,6 +43,7 @@
 #include <linux/sysrq.h>
 #include <linux/init.h>
 #include <linux/kgdb.h>
+#include <linux/kdb.h>
 #include <linux/pid.h>
 #include <linux/smp.h>
 #include <linux/mm.h>
@@ -77,6 +78,11 @@ static DEFINE_SPINLOCK(kgdb_registration_lock);
 static int kgdb_con_registered;
 /* determine if kgdb console output should be used */
 static int kgdb_use_con;
+/* Next cpu to become the master debug core */
+int dbg_switch_cpu;
+
+/* Use kdb or gdbserver mode */
+static int dbg_kdb_mode = 1;
 
 static int __init opt_kgdb_con(char *str)
 {
@@ -100,6 +106,7 @@ static struct kgdb_bkpt		kgdb_break[KGDB_MAX_BREAKPOINTS] = {
  * The CPU# of the active CPU, or -1 if none:
  */
 atomic_t			kgdb_active = ATOMIC_INIT(-1);
+EXPORT_SYMBOL_GPL(kgdb_active);
 
 /*
  * We use NR_CPUs not PERCPU, in case kgdb is used to debug early
@@ -301,7 +308,7 @@ int dbg_set_sw_break(unsigned long addr)
 	return 0;
 }
 
-static int kgdb_deactivate_sw_breakpoints(void)
+int dbg_deactivate_sw_breakpoints(void)
 {
 	unsigned long addr;
 	int error;
@@ -395,8 +402,14 @@ static int kgdb_io_ready(int print_wait)
 		return 1;
 	if (atomic_read(&kgdb_setting_breakpoint))
 		return 1;
-	if (print_wait)
+	if (print_wait) {
+#ifdef CONFIG_KGDB_KDB
+		if (!dbg_kdb_mode)
+			printk(KERN_CRIT "KGDB: waiting... or $3#33 for KDB\n");
+#else
 		printk(KERN_CRIT "KGDB: Waiting for remote debugger\n");
+#endif
+	}
 	return 1;
 }
 
@@ -410,7 +423,7 @@ static int kgdb_reenter_check(struct kgdb_state *ks)
 	/* Panic on recursive debugger calls: */
 	exception_level++;
 	addr = kgdb_arch_pc(ks->ex_vector, ks->linux_regs);
-	kgdb_deactivate_sw_breakpoints();
+	dbg_deactivate_sw_breakpoints();
 
 	/*
 	 * If the break point removed ok at the place exception
@@ -443,11 +456,24 @@ static int kgdb_reenter_check(struct kgdb_state *ks)
 	return 1;
 }
 
+static void dbg_cpu_switch(int cpu, int next_cpu)
+{
+	/* Mark the cpu we are switching away from as a slave when it
+	 * holds the kgdb_active token.  This must be done so that the
+	 * that all the cpus wait in for the debug core will not enter
+	 * again as the master. */
+	if (cpu == atomic_read(&kgdb_active)) {
+		kgdb_info[cpu].exception_state |= DCPU_IS_SLAVE;
+		kgdb_info[cpu].exception_state &= ~DCPU_WANT_MASTER;
+	}
+	kgdb_info[next_cpu].exception_state |= DCPU_NEXT_MASTER;
+}
+
 static int kgdb_cpu_enter(struct kgdb_state *ks, struct pt_regs *regs)
 {
 	unsigned long flags;
 	int sstep_tries = 100;
-	int error = 0;
+	int error;
 	int i, cpu;
 	int trace_on = 0;
 acquirelock:
@@ -460,6 +486,8 @@ acquirelock:
 	cpu = ks->cpu;
 	kgdb_info[cpu].debuggerinfo = regs;
 	kgdb_info[cpu].task = current;
+	kgdb_info[cpu].ret_state = 0;
+	kgdb_info[cpu].irq_depth = hardirq_count() >> HARDIRQ_SHIFT;
 	/*
 	 * Make sure the above info reaches the primary CPU before
 	 * our cpu_in_kgdb[] flag setting does:
@@ -471,7 +499,11 @@ acquirelock:
 	 * master cpu and acquire the kgdb_active lock:
 	 */
 	while (1) {
-		if (kgdb_info[cpu].exception_state & DCPU_WANT_MASTER) {
+cpu_loop:
+		if (kgdb_info[cpu].exception_state & DCPU_NEXT_MASTER) {
+			kgdb_info[cpu].exception_state &= ~DCPU_NEXT_MASTER;
+			goto cpu_master_loop;
+		} else if (kgdb_info[cpu].exception_state & DCPU_WANT_MASTER) {
 			if (atomic_cmpxchg(&kgdb_active, -1, cpu) == cpu)
 				break;
 		} else if (kgdb_info[cpu].exception_state & DCPU_IS_SLAVE) {
@@ -513,7 +545,7 @@ return_normal:
 	}
 
 	if (!kgdb_io_ready(1)) {
-		error = 1;
+		kgdb_info[cpu].ret_state = 1;
 		goto kgdb_restore; /* No I/O connection, resume the system */
 	}
 
@@ -548,7 +580,7 @@ return_normal:
 	 * Wait for the other CPUs to be notified and be waiting for us:
 	 */
 	for_each_online_cpu(i) {
-		while (!atomic_read(&cpu_in_kgdb[i]))
+		while (kgdb_do_roundup && !atomic_read(&cpu_in_kgdb[i]))
 			cpu_relax();
 	}
 
@@ -557,7 +589,7 @@ return_normal:
 	 * in the debugger and all secondary CPUs are quiescent
 	 */
 	kgdb_post_primary_code(ks->linux_regs, ks->ex_vector, ks->err_code);
-	kgdb_deactivate_sw_breakpoints();
+	dbg_deactivate_sw_breakpoints();
 	kgdb_single_step = 0;
 	kgdb_contthread = current;
 	exception_level = 0;
@@ -565,8 +597,26 @@ return_normal:
 	if (trace_on)
 		tracing_off();
 
-	/* Talk to debugger with gdbserial protocol */
-	error = gdb_serial_stub(ks);
+	while (1) {
+cpu_master_loop:
+		if (dbg_kdb_mode) {
+			kgdb_connected = 1;
+			error = kdb_stub(ks);
+		} else {
+			error = gdb_serial_stub(ks);
+		}
+
+		if (error == DBG_PASS_EVENT) {
+			dbg_kdb_mode = !dbg_kdb_mode;
+			kgdb_connected = 0;
+		} else if (error == DBG_SWITCH_CPU_EVENT) {
+			dbg_cpu_switch(cpu, dbg_switch_cpu);
+			goto cpu_loop;
+		} else {
+			kgdb_info[cpu].ret_state = error;
+			break;
+		}
+	}
 
 	/* Call the I/O driver's post_exception routine */
 	if (dbg_io_ops->post_exception)
@@ -578,11 +628,16 @@ return_normal:
 		for (i = NR_CPUS-1; i >= 0; i--)
 			atomic_dec(&passive_cpu_wait[i]);
 		/*
-		 * Wait till all the CPUs have quit
-		 * from the debugger.
+		 * Wait till all the CPUs have quit from the debugger,
+		 * but allow a CPU that hit an exception and is
+		 * waiting to become the master to remain in the debug
+		 * core.
 		 */
 		for_each_online_cpu(i) {
-			while (atomic_read(&cpu_in_kgdb[i]))
+			while (kgdb_do_roundup &&
+			       atomic_read(&cpu_in_kgdb[i]) &&
+			       !(kgdb_info[i].exception_state &
+				 DCPU_WANT_MASTER))
 				cpu_relax();
 		}
 	}
@@ -603,7 +658,7 @@ kgdb_restore:
 	clocksource_touch_watchdog();
 	local_irq_restore(flags);
 
-	return error;
+	return kgdb_info[cpu].ret_state;
 }
 
 /*
@@ -632,7 +687,8 @@ kgdb_handle_exception(int evector, int signo, int ecode, struct pt_regs *regs)
 		return 0; /* Ouch, double exception ! */
 	kgdb_info[ks->cpu].exception_state |= DCPU_WANT_MASTER;
 	ret = kgdb_cpu_enter(ks, regs);
-	kgdb_info[ks->cpu].exception_state &= ~DCPU_WANT_MASTER;
+	kgdb_info[ks->cpu].exception_state &= ~(DCPU_WANT_MASTER |
+						DCPU_IS_SLAVE);
 	return ret;
 }
 
@@ -665,7 +721,7 @@ static void kgdb_console_write(struct console *co, const char *s,
 
 	/* If we're debugging, or KGDB has not connected, don't try
 	 * and print. */
-	if (!kgdb_connected || atomic_read(&kgdb_active) != -1)
+	if (!kgdb_connected || atomic_read(&kgdb_active) != -1 || dbg_kdb_mode)
 		return;
 
 	local_irq_save(flags);
@@ -687,8 +743,14 @@ static void sysrq_handle_dbg(int key, struct tty_struct *tty)
 		printk(KERN_CRIT "ERROR: No KGDB I/O module available\n");
 		return;
 	}
-	if (!kgdb_connected)
+	if (!kgdb_connected) {
+#ifdef CONFIG_KGDB_KDB
+		if (!dbg_kdb_mode)
+			printk(KERN_CRIT "KGDB or $3#33 for KDB\n");
+#else
 		printk(KERN_CRIT "Entering KGDB\n");
+#endif
+	}
 
 	kgdb_breakpoint();
 }
@@ -817,6 +879,16 @@ void kgdb_unregister_io_module(struct kgdb_io *old_dbg_io_ops)
 }
 EXPORT_SYMBOL_GPL(kgdb_unregister_io_module);
 
+int dbg_io_get_char(void)
+{
+	int ret = dbg_io_ops->read_char();
+	if (!dbg_kdb_mode)
+		return ret;
+	if (ret == 127)
+		return 8;
+	return ret;
+}
+
 /**
  * kgdb_breakpoint - generate breakpoint exception
  *
@@ -839,6 +911,7 @@ static int __init opt_kgdb_wait(char *str)
 {
 	kgdb_break_asap = 1;
 
+	kdb_init(KDB_INIT_EARLY);
 	if (kgdb_io_module_registered)
 		kgdb_initial_breakpoint();
 
diff --git a/kernel/debug/debug_core.h b/kernel/debug/debug_core.h
index db554f9..44cf3de 100644
--- a/kernel/debug/debug_core.h
+++ b/kernel/debug/debug_core.h
@@ -38,6 +38,8 @@ struct debuggerinfo_struct {
 	void			*debuggerinfo;
 	struct task_struct	*task;
 	int			exception_state;
+	int			ret_state;
+	int			irq_depth;
 };
 
 extern struct debuggerinfo_struct kgdb_info[];
@@ -47,9 +49,31 @@ extern int dbg_remove_all_break(void);
 extern int dbg_set_sw_break(unsigned long addr);
 extern int dbg_remove_sw_break(unsigned long addr);
 extern int dbg_activate_sw_breakpoints(void);
+extern int dbg_deactivate_sw_breakpoints(void);
+
+/* polled character access to i/o module */
+extern int dbg_io_get_char(void);
+
+/* stub return value for switching between the gdbstub and kdb */
+#define DBG_PASS_EVENT -12345
+/* Switch from one cpu to another */
+#define DBG_SWITCH_CPU_EVENT -123456
+extern int dbg_switch_cpu;
 
 /* gdbstub interface functions */
 extern int gdb_serial_stub(struct kgdb_state *ks);
 extern void gdbstub_msg_write(const char *s, int len);
 
+/* gdbstub functions used for kdb <-> gdbstub transition */
+extern int gdbstub_state(struct kgdb_state *ks, char *cmd);
+
+#ifdef CONFIG_KGDB_KDB
+extern int kdb_stub(struct kgdb_state *ks);
+#else /* ! CONFIG_KGDB_KDB */
+static inline int kdb_stub(struct kgdb_state *ks)
+{
+	return DBG_PASS_EVENT;
+}
+#endif /* CONFIG_KGDB_KDB */
+
 #endif /* _DEBUG_CORE_H_ */
diff --git a/kernel/debug/gdbstub.c b/kernel/debug/gdbstub.c
index ccdf092..188203a 100644
--- a/kernel/debug/gdbstub.c
+++ b/kernel/debug/gdbstub.c
@@ -887,6 +887,13 @@ int gdb_serial_stub(struct kgdb_state *ks)
 		case 'Z': /* Break point set */
 			gdb_cmd_break(ks);
 			break;
+#ifdef CONFIG_KGDB_KDB
+		case '3': /* Escape into back into kdb */
+			if (remcom_in_buffer[1] == '\0') {
+				gdb_cmd_detachkill(ks);
+				return DBG_PASS_EVENT;
+			}
+#endif
 		case 'C': /* Exception passing */
 			tmp = gdb_cmd_exception_pass(ks);
 			if (tmp > 0)
@@ -932,3 +939,32 @@ kgdb_exit:
 		error = 1;
 	return error;
 }
+
+int gdbstub_state(struct kgdb_state *ks, char *cmd)
+{
+	int error;
+
+	switch (cmd[0]) {
+	case 'e':
+		error = kgdb_arch_handle_exception(ks->ex_vector,
+						   ks->signo,
+						   ks->err_code,
+						   remcom_in_buffer,
+						   remcom_out_buffer,
+						   ks->linux_regs);
+		return error;
+	case 's':
+	case 'c':
+		strcpy(remcom_in_buffer, cmd);
+		return 0;
+	case '?':
+		gdb_cmd_status(ks);
+		break;
+	case '\0':
+		strcpy(remcom_out_buffer, "");
+		break;
+	}
+	dbg_io_ops->write_char('+');
+	put_packet(remcom_out_buffer);
+	return 0;
+}