#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> */ #include <linux/list.h> /* Shifted versions of the command enable bits are be used if the command * has no arguments (see kdb_check_flags). This allows commands, such as * go, to have different permissions depending upon whether it is called * with an argument. */ #define KDB_ENABLE_NO_ARGS_SHIFT 10 typedef enum { KDB_ENABLE_ALL = (1 << 0), /* Enable everything */ KDB_ENABLE_MEM_READ = (1 << 1), KDB_ENABLE_MEM_WRITE = (1 << 2), KDB_ENABLE_REG_READ = (1 << 3), KDB_ENABLE_REG_WRITE = (1 << 4), KDB_ENABLE_INSPECT = (1 << 5), KDB_ENABLE_FLOW_CTRL = (1 << 6), KDB_ENABLE_SIGNAL = (1 << 7), KDB_ENABLE_REBOOT = (1 << 8), /* User exposed values stop here, all remaining flags are * exclusively used to describe a commands behaviour. */ KDB_ENABLE_ALWAYS_SAFE = (1 << 9), KDB_ENABLE_MASK = (1 << KDB_ENABLE_NO_ARGS_SHIFT) - 1, KDB_ENABLE_ALL_NO_ARGS = KDB_ENABLE_ALL << KDB_ENABLE_NO_ARGS_SHIFT, KDB_ENABLE_MEM_READ_NO_ARGS = KDB_ENABLE_MEM_READ << KDB_ENABLE_NO_ARGS_SHIFT, KDB_ENABLE_MEM_WRITE_NO_ARGS = KDB_ENABLE_MEM_WRITE << KDB_ENABLE_NO_ARGS_SHIFT, KDB_ENABLE_REG_READ_NO_ARGS = KDB_ENABLE_REG_READ << KDB_ENABLE_NO_ARGS_SHIFT, KDB_ENABLE_REG_WRITE_NO_ARGS = KDB_ENABLE_REG_WRITE << KDB_ENABLE_NO_ARGS_SHIFT, KDB_ENABLE_INSPECT_NO_ARGS = KDB_ENABLE_INSPECT << KDB_ENABLE_NO_ARGS_SHIFT, KDB_ENABLE_FLOW_CTRL_NO_ARGS = KDB_ENABLE_FLOW_CTRL << KDB_ENABLE_NO_ARGS_SHIFT, KDB_ENABLE_SIGNAL_NO_ARGS = KDB_ENABLE_SIGNAL << KDB_ENABLE_NO_ARGS_SHIFT, KDB_ENABLE_REBOOT_NO_ARGS = KDB_ENABLE_REBOOT << KDB_ENABLE_NO_ARGS_SHIFT, KDB_ENABLE_ALWAYS_SAFE_NO_ARGS = KDB_ENABLE_ALWAYS_SAFE << KDB_ENABLE_NO_ARGS_SHIFT, KDB_ENABLE_MASK_NO_ARGS = KDB_ENABLE_MASK << KDB_ENABLE_NO_ARGS_SHIFT, KDB_REPEAT_NO_ARGS = 0x40000000, /* Repeat the command w/o arguments */ KDB_REPEAT_WITH_ARGS = 0x80000000, /* Repeat the command with args */ } kdb_cmdflags_t; typedef int (*kdb_func_t)(int, const char **); /* The KDB shell command table */ typedef struct _kdbtab { char *name; /* Command name */ kdb_func_t func; /* Function to execute command */ char *usage; /* Usage String for this command */ char *help; /* Help message for this command */ short minlen; /* Minimum legal # cmd chars required */ kdb_cmdflags_t flags; /* Command behaviour flags */ struct list_head list_node; /* Command list */ } kdbtab_t; #ifdef CONFIG_KGDB_KDB #include <linux/init.h> #include <linux/sched.h> #include <linux/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; /* Types and messages used for dynamically added kdb shell commands */ #define KDB_MAXARGS 16 /* Maximum number of arguments to a function */ /* KDB return codes from a command or internal kdb function */ #define KDB_NOTFOUND (-1) #define KDB_ARGCOUNT (-2) #define KDB_BADWIDTH (-3) #define KDB_BADRADIX (-4) #define KDB_NOTENV (-5) #define KDB_NOENVVALUE (-6) #define KDB_NOTIMP (-7) #define KDB_ENVFULL (-8) #define KDB_ENVBUFFULL (-9) #define KDB_TOOMANYBPT (-10) #define KDB_TOOMANYDBREGS (-11) #define KDB_DUPBPT (-12) #define KDB_BPTNOTFOUND (-13) #define KDB_BADMODE (-14) #define KDB_BADINT (-15) #define KDB_INVADDRFMT (-16) #define KDB_BADREG (-17) #define KDB_BADCPUNUM (-18) #define KDB_BADLENGTH (-19) #define KDB_NOBP (-20) #define KDB_BADADDR (-21) #define KDB_NOPERM (-22) /* * 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_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 unsigned 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_SYSTEM_NMI, /* In NMI due to SYSTEM cmd; regs valid */ } kdb_reason_t; enum kdb_msgsrc { KDB_MSGSRC_INTERNAL, /* direct call to kdb_printf() */ KDB_MSGSRC_PRINTK, /* trapped from printk() */ }; extern int kdb_trap_printk; extern int kdb_printf_cpu; extern __printf(2, 0) int vkdb_printf(enum kdb_msgsrc src, const char *fmt, va_list args); extern __printf(1, 2) int kdb_printf(const char *, ...); typedef __printf(1, 2) int (*kdb_printf_t)(const char *, ...); 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_cpu(p); if (cpu > num_possible_cpus()) cpu = 0; return cpu; } #ifdef CONFIG_KALLSYMS extern const char *kdb_walk_kallsyms(loff_t *pos); #else /* ! CONFIG_KALLSYMS */ static inline const char *kdb_walk_kallsyms(loff_t *pos) { return NULL; } #endif /* ! CONFIG_KALLSYMS */ /* Dynamic kdb shell command registration */ extern int kdb_register(kdbtab_t *cmd); extern void kdb_unregister(kdbtab_t *cmd); #else /* ! CONFIG_KGDB_KDB */ static inline __printf(1, 2) int kdb_printf(const char *fmt, ...) { return 0; } static inline void kdb_init(int level) {} static inline int kdb_register(kdbtab_t *cmd) { return 0; } static inline void kdb_unregister(kdbtab_t *cmd) {} #endif /* CONFIG_KGDB_KDB */ enum { KDB_NOT_INITIALIZED, KDB_INIT_EARLY, KDB_INIT_FULL, }; extern int kdbgetintenv(const char *, int *); extern int kdb_set(int, const char **); int kdb_lsmod(int argc, const char **argv); #endif /* !_KDB_H */