Merge branch 'kdb-merge' of git://git.kernel.org/pub/scm/linux/kernel/git/jwessel/linux-2.6-kgdb

* 'kdb-merge' of git://git.kernel.org/pub/scm/linux/kernel/git/jwessel/linux-2.6-kgdb: (25 commits)
  kdb,debug_core: Allow the debug core to receive a panic notification
  MAINTAINERS: update kgdb, kdb, and debug_core info
  debug_core,kdb: Allow the debug core to process a recursive debug entry
  printk,kdb: capture printk() when in kdb shell
  kgdboc,kdb: Allow kdb to work on a non open console port
  kgdb: Add the ability to schedule a breakpoint via a tasklet
  mips,kgdb: kdb low level trap catch and stack trace
  powerpc,kgdb: Introduce low level trap catching
  x86,kgdb: Add low level debug hook
  kgdb: remove post_primary_code references
  kgdb,docs: Update the kgdb docs to include kdb
  kgdboc,keyboard: Keyboard driver for kdb with kgdb
  kgdb: gdb "monitor" -> kdb passthrough
  sparc,sunzilog: Add console polling support for sunzilog serial driver
  sh,sh-sci: Use NO_POLL_CHAR in the SCIF polled console code
  kgdb,8250,pl011: Return immediately from console poll
  kgdb: core changes to support kdb
  kdb: core for kgdb back end (2 of 2)
  kdb: core for kgdb back end (1 of 2)
  kgdb,blackfin: Add in kgdb_arch_set_pc for blackfin
  ...

3 files changed, 143 insertions, 16 deletions

diff --git a/include/linux/kdb.h b/include/linux/kdb.h
new file mode 100644
index 000000000000..ccb2b3ec0fe8
--- /dev/null
+++ b/include/linux/kdb.h
@@ -0,0 +1,117 @@
+#ifndef _KDB_H
+#define _KDB_H
+
+/*
+ * Kernel Debugger Architecture Independent Global Headers
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (c) 2000-2007 Silicon Graphics, Inc.  All Rights Reserved.
+ * Copyright (C) 2000 Stephane Eranian <eranian@hpl.hp.com>
+ * Copyright (C) 2009 Jason Wessel <jason.wessel@windriver.com>
+ */
+
+#ifdef  CONFIG_KGDB_KDB
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <asm/atomic.h>
+
+#define KDB_POLL_FUNC_MAX       5
+extern int kdb_poll_idx;
+
+/*
+ * kdb_initial_cpu is initialized to -1, and is set to the cpu
+ * number whenever the kernel debugger is entered.
+ */
+extern int kdb_initial_cpu;
+extern atomic_t kdb_event;
+
+/*
+ * kdb_diemsg
+ *
+ *      Contains a pointer to the last string supplied to the
+ *      kernel 'die' panic function.
+ */
+extern const char *kdb_diemsg;
+
+#define KDB_FLAG_EARLYKDB       (1 << 0) /* set from boot parameter kdb=early */
+#define KDB_FLAG_CATASTROPHIC   (1 << 1) /* A catastrophic event has occurred */
+#define KDB_FLAG_CMD_INTERRUPT  (1 << 2) /* Previous command was interrupted */
+#define KDB_FLAG_NOIPI          (1 << 3) /* Do not send IPIs */
+#define KDB_FLAG_ONLY_DO_DUMP   (1 << 4) /* Only do a dump, used when
+                                          * kdb is off */
+#define KDB_FLAG_NO_CONSOLE     (1 << 5) /* No console is available,
+                                          * kdb is disabled */
+#define KDB_FLAG_NO_VT_CONSOLE  (1 << 6) /* No VT console is available, do
+                                          * not use keyboard */
+#define KDB_FLAG_NO_I8042       (1 << 7) /* No i8042 chip is available, do
+                                          * not use keyboard */
+
+extern int kdb_flags;   /* Global flags, see kdb_state for per cpu state */
+
+extern void kdb_save_flags(void);
+extern void kdb_restore_flags(void);
+
+#define KDB_FLAG(flag)          (kdb_flags & KDB_FLAG_##flag)
+#define KDB_FLAG_SET(flag)      ((void)(kdb_flags |= KDB_FLAG_##flag))
+#define KDB_FLAG_CLEAR(flag)    ((void)(kdb_flags &= ~KDB_FLAG_##flag))
+
+/*
+ * External entry point for the kernel debugger.  The pt_regs
+ * at the time of entry are supplied along with the reason for
+ * entry to the kernel debugger.
+ */
+
+typedef enum {
+        KDB_REASON_ENTER = 1,   /* KDB_ENTER() trap/fault - regs valid */
+        KDB_REASON_ENTER_SLAVE, /* KDB_ENTER_SLAVE() trap/fault - regs valid */
+        KDB_REASON_BREAK,       /* Breakpoint inst. - regs valid */
+        KDB_REASON_DEBUG,       /* Debug Fault - regs valid */
+        KDB_REASON_OOPS,        /* Kernel Oops - regs valid */
+        KDB_REASON_SWITCH,      /* CPU switch - regs valid*/
+        KDB_REASON_KEYBOARD,    /* Keyboard entry - regs valid */
+        KDB_REASON_NMI,         /* Non-maskable interrupt; regs valid */
+        KDB_REASON_RECURSE,     /* Recursive entry to kdb;
+                                 * regs probably valid */
+        KDB_REASON_SSTEP,       /* Single Step trap. - regs valid */
+} kdb_reason_t;
+
+extern int kdb_trap_printk;
+extern int vkdb_printf(const char *fmt, va_list args)
+            __attribute__ ((format (printf, 1, 0)));
+extern int kdb_printf(const char *, ...)
+            __attribute__ ((format (printf, 1, 2)));
+typedef int (*kdb_printf_t)(const char *, ...)
+             __attribute__ ((format (printf, 1, 2)));
+
+extern void kdb_init(int level);
+
+/* Access to kdb specific polling devices */
+typedef int (*get_char_func)(void);
+extern get_char_func kdb_poll_funcs[];
+extern int kdb_get_kbd_char(void);
+
+static inline
+int kdb_process_cpu(const struct task_struct *p)
+{
+        unsigned int cpu = task_thread_info(p)->cpu;
+        if (cpu > num_possible_cpus())
+                cpu = 0;
+        return cpu;
+}
+
+/* kdb access to register set for stack dumping */
+extern struct pt_regs *kdb_current_regs;
+
+#else /* ! CONFIG_KGDB_KDB */
+#define kdb_printf(...)
+#define kdb_init(x)
+#endif  /* CONFIG_KGDB_KDB */
+enum {
+        KDB_NOT_INITIALIZED,
+        KDB_INIT_EARLY,
+        KDB_INIT_FULL,
+};
+#endif  /* !_KDB_H */
diff --git a/include/linux/kgdb.h b/include/linux/kgdb.h
index 19ec41a183f5..6c784ab6856a 100644
--- a/include/linux/kgdb.h
+++ b/include/linux/kgdb.h
@@ -16,10 +16,12 @@
 #include <linux/serial_8250.h>
 #include <linux/linkage.h>
 #include <linux/init.h>
-
 #include <asm/atomic.h>
+#ifdef CONFIG_HAVE_ARCH_KGDB
 #include <asm/kgdb.h>
+#endif
 
+#ifdef CONFIG_KGDB
 struct pt_regs;
 
 /**
@@ -34,20 +36,6 @@ struct pt_regs;
 extern int kgdb_skipexception(int exception, struct pt_regs *regs);
 
 /**
- *      kgdb_post_primary_code - (optional) Save error vector/code numbers.
- *      @regs: Original pt_regs.
- *      @e_vector: Original error vector.
- *      @err_code: Original error code.
- *
- *      This is usually needed on architectures which support SMP and
- *      KGDB.  This function is called after all the secondary cpus have
- *      been put to a know spin state and the primary CPU has control over
- *      KGDB.
- */
-extern void kgdb_post_primary_code(struct pt_regs *regs, int e_vector,
-                                  int err_code);
-
-/**
  *      kgdb_disable_hw_debug - (optional) Disable hardware debugging hook
  *      @regs: Current &struct pt_regs.
  *
@@ -72,6 +60,7 @@ struct uart_port;
 void kgdb_breakpoint(void);
 
 extern int kgdb_connected;
+extern int kgdb_io_module_registered;
 
 extern atomic_t                 kgdb_setting_breakpoint;
 extern atomic_t                 kgdb_cpu_doing_single_step;
@@ -202,6 +191,17 @@ kgdb_arch_handle_exception(int vector, int signo, int err_code,
  */
 extern void kgdb_roundup_cpus(unsigned long flags);
 
+/**
+ *      kgdb_arch_set_pc - Generic call back to the program counter
+ *      @regs: Current &struct pt_regs.
+ *  @pc: The new value for the program counter
+ *
+ *      This function handles updating the program counter and requires an
+ *      architecture specific implementation.
+ */
+extern void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long pc);
+
+
 /* Optional functions. */
 extern int kgdb_validate_break_address(unsigned long addr);
 extern int kgdb_arch_set_breakpoint(unsigned long addr, char *saved_instr);
@@ -247,6 +247,8 @@ struct kgdb_arch {
  * the I/O driver.
  * @post_exception: Pointer to a function that will do any cleanup work
  * for the I/O driver.
+ * @is_console: 1 if the end device is a console 0 if the I/O device is
+ * not a console
  */
 struct kgdb_io {
         const char              *name;
@@ -256,6 +258,7 @@ struct kgdb_io {
         int                     (*init) (void);
         void                    (*pre_exception) (void);
         void                    (*post_exception) (void);
+        int                     is_console;
 };
 
 extern struct kgdb_arch         arch_kgdb_ops;
@@ -264,12 +267,14 @@ extern unsigned long __weak kgdb_arch_pc(int exception, struct pt_regs *regs);
 
 extern int kgdb_register_io_module(struct kgdb_io *local_kgdb_io_ops);
 extern void kgdb_unregister_io_module(struct kgdb_io *local_kgdb_io_ops);
+extern struct kgdb_io *dbg_io_ops;
 
 extern int kgdb_hex2long(char **ptr, unsigned long *long_val);
 extern int kgdb_mem2hex(char *mem, char *buf, int count);
 extern int kgdb_hex2mem(char *buf, char *mem, int count);
 
 extern int kgdb_isremovedbreak(unsigned long addr);
+extern void kgdb_schedule_breakpoint(void);
 
 extern int
 kgdb_handle_exception(int ex_vector, int signo, int err_code,
@@ -278,5 +283,9 @@ extern int kgdb_nmicallback(int cpu, void *regs);
 
 extern int                      kgdb_single_step;
 extern atomic_t                 kgdb_active;
-
+#define in_dbg_master() \
+        (raw_smp_processor_id() == atomic_read(&kgdb_active))
+#else /* ! CONFIG_KGDB */
+#define in_dbg_master() (0)
+#endif /* ! CONFIG_KGDB */
 #endif /* _KGDB_H_ */
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index 09d0d2d5a08b..f10db6e5f3b5 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -250,6 +250,7 @@ struct uart_ops {
 #endif
 };
 
+#define NO_POLL_CHAR            0x00ff0000
 #define UART_CONFIG_TYPE        (1 << 0)
 #define UART_CONFIG_IRQ         (1 << 1)