1 #ifndef _KDB_H 2 #define _KDB_H 3 4 /* 5 * Kernel Debugger Architecture Independent Global Headers 6 * 7 * This file is subject to the terms and conditions of the GNU General Public 8 * License. See the file "COPYING" in the main directory of this archive 9 * for more details. 10 * 11 * Copyright (c) 2000-2007 Silicon Graphics, Inc. All Rights Reserved. 12 * Copyright (C) 2000 Stephane Eranian <[email protected]> 13 * Copyright (C) 2009 Jason Wessel <[email protected]> 14 */ 15 16 #ifdef CONFIG_KGDB_KDB 17 #include <linux/init.h> 18 #include <linux/sched.h> 19 #include <asm/atomic.h> 20 21 #define KDB_POLL_FUNC_MAX 5 22 extern int kdb_poll_idx; 23 24 /* 25 * kdb_initial_cpu is initialized to -1, and is set to the cpu 26 * number whenever the kernel debugger is entered. 27 */ 28 extern int kdb_initial_cpu; 29 extern atomic_t kdb_event; 30 31 /* 32 * kdb_diemsg 33 * 34 * Contains a pointer to the last string supplied to the 35 * kernel 'die' panic function. 36 */ 37 extern const char *kdb_diemsg; 38 39 #define KDB_FLAG_EARLYKDB (1 << 0) /* set from boot parameter kdb=early */ 40 #define KDB_FLAG_CATASTROPHIC (1 << 1) /* A catastrophic event has occurred */ 41 #define KDB_FLAG_CMD_INTERRUPT (1 << 2) /* Previous command was interrupted */ 42 #define KDB_FLAG_NOIPI (1 << 3) /* Do not send IPIs */ 43 #define KDB_FLAG_ONLY_DO_DUMP (1 << 4) /* Only do a dump, used when 44 * kdb is off */ 45 #define KDB_FLAG_NO_CONSOLE (1 << 5) /* No console is available, 46 * kdb is disabled */ 47 #define KDB_FLAG_NO_VT_CONSOLE (1 << 6) /* No VT console is available, do 48 * not use keyboard */ 49 #define KDB_FLAG_NO_I8042 (1 << 7) /* No i8042 chip is available, do 50 * not use keyboard */ 51 52 extern int kdb_flags; /* Global flags, see kdb_state for per cpu state */ 53 54 extern void kdb_save_flags(void); 55 extern void kdb_restore_flags(void); 56 57 #define KDB_FLAG(flag) (kdb_flags & KDB_FLAG_##flag) 58 #define KDB_FLAG_SET(flag) ((void)(kdb_flags |= KDB_FLAG_##flag)) 59 #define KDB_FLAG_CLEAR(flag) ((void)(kdb_flags &= ~KDB_FLAG_##flag)) 60 61 /* 62 * External entry point for the kernel debugger. The pt_regs 63 * at the time of entry are supplied along with the reason for 64 * entry to the kernel debugger. 65 */ 66 67 typedef enum { 68 KDB_REASON_ENTER = 1, /* KDB_ENTER() trap/fault - regs valid */ 69 KDB_REASON_ENTER_SLAVE, /* KDB_ENTER_SLAVE() trap/fault - regs valid */ 70 KDB_REASON_BREAK, /* Breakpoint inst. - regs valid */ 71 KDB_REASON_DEBUG, /* Debug Fault - regs valid */ 72 KDB_REASON_OOPS, /* Kernel Oops - regs valid */ 73 KDB_REASON_SWITCH, /* CPU switch - regs valid*/ 74 KDB_REASON_KEYBOARD, /* Keyboard entry - regs valid */ 75 KDB_REASON_NMI, /* Non-maskable interrupt; regs valid */ 76 KDB_REASON_RECURSE, /* Recursive entry to kdb; 77 * regs probably valid */ 78 KDB_REASON_SSTEP, /* Single Step trap. - regs valid */ 79 } kdb_reason_t; 80 81 extern int kdb_trap_printk; 82 extern int vkdb_printf(const char *fmt, va_list args) 83 __attribute__ ((format (printf, 1, 0))); 84 extern int kdb_printf(const char *, ...) 85 __attribute__ ((format (printf, 1, 2))); 86 typedef int (*kdb_printf_t)(const char *, ...) 87 __attribute__ ((format (printf, 1, 2))); 88 89 extern void kdb_init(int level); 90 91 /* Access to kdb specific polling devices */ 92 typedef int (*get_char_func)(void); 93 extern get_char_func kdb_poll_funcs[]; 94 extern int kdb_get_kbd_char(void); 95 96 static inline 97 int kdb_process_cpu(const struct task_struct *p) 98 { 99 unsigned int cpu = task_thread_info(p)->cpu; 100 if (cpu > num_possible_cpus()) 101 cpu = 0; 102 return cpu; 103 } 104 105 /* kdb access to register set for stack dumping */ 106 extern struct pt_regs *kdb_current_regs; 107 108 #else /* ! CONFIG_KGDB_KDB */ 109 #define kdb_printf(...) 110 #define kdb_init(x) 111 #endif /* CONFIG_KGDB_KDB */ 112 enum { 113 KDB_NOT_INITIALIZED, 114 KDB_INIT_EARLY, 115 KDB_INIT_FULL, 116 }; 117 118 extern int kdbgetintenv(const char *, int *); 119 extern int kdb_set(int, const char **); 120 121 #endif /* !_KDB_H */ 122