kernel/debug/debug_core.h

   1 /*
   2  * Created by: Jason Wessel <jason.wessel@windriver.com>
   3  *
   4  * Copyright (c) 2009 Wind River Systems, Inc.  All Rights Reserved.
   5  *
   6  * This file is licensed under the terms of the GNU General Public
   7  * License version 2. This program is licensed "as is" without any
   8  * warranty of any kind, whether express or implied.
   9  */
  10
  11 #ifndef _DEBUG_CORE_H_
  12 #define _DEBUG_CORE_H_
  13 /*
  14  * These are the private implementation headers between the kernel
  15  * debugger core and the debugger front end code.
  16  */
  17
  18 /* kernel debug core data structures */
  19 struct kgdb_state {
  20         int                     ex_vector;
  21         int                     signo;
  22         int                     err_code;
  23         int                     cpu;
  24         int                     pass_exception;
  25         unsigned long           thr_query;
  26         unsigned long           threadid;
  27         long                    kgdb_usethreadid;
  28         struct pt_regs          *linux_regs;
  29         atomic_t                *send_ready;
  30 };
  31
  32 /* Exception state values */
  33 #define DCPU_WANT_MASTER 0x1 /* Waiting to become a master kgdb cpu */
  34 #define DCPU_NEXT_MASTER 0x2 /* Transition from one master cpu to another */
  35 #define DCPU_IS_SLAVE    0x4 /* Slave cpu enter exception */
  36 #define DCPU_WANT_BT     0x8 /* Slave cpu should backtrace then clear flag */
  37
  38 struct debuggerinfo_struct {
  39         void                    *debuggerinfo;
  40         struct task_struct      *task;
  41         int                     exception_state;
  42         int                     ret_state;
  43         int                     irq_depth;
  44         int                     enter_kgdb;
  45         bool                    rounding_up;
  46 };
  47
  48 extern struct debuggerinfo_struct kgdb_info[];
  49
  50 /* kernel debug core break point routines */
  51 extern int dbg_remove_all_break(void);
  52 extern int dbg_set_sw_break(unsigned long addr);
  53 extern int dbg_remove_sw_break(unsigned long addr);
  54 extern int dbg_activate_sw_breakpoints(void);
  55 extern int dbg_deactivate_sw_breakpoints(void);
  56
  57 /* polled character access to i/o module */
  58 extern int dbg_io_get_char(void);
  59
  60 /* stub return value for switching between the gdbstub and kdb */
  61 #define DBG_PASS_EVENT -12345
  62 /* Switch from one cpu to another */
  63 #define DBG_SWITCH_CPU_EVENT -123456
  64 extern int dbg_switch_cpu;
  65
  66 /* gdbstub interface functions */
  67 extern int gdb_serial_stub(struct kgdb_state *ks);
  68 extern void gdbstub_msg_write(const char *s, int len);
  69
  70 /* gdbstub functions used for kdb <-> gdbstub transition */
  71 extern int gdbstub_state(struct kgdb_state *ks, char *cmd);
  72 extern int dbg_kdb_mode;
  73
  74 #ifdef CONFIG_KGDB_KDB
  75 extern int kdb_stub(struct kgdb_state *ks);
  76 extern int kdb_parse(const char *cmdstr);
  77 extern int kdb_common_init_state(struct kgdb_state *ks);
  78 extern int kdb_common_deinit_state(void);
  79 extern void kdb_dump_stack_on_cpu(int cpu);
  80 #else /* ! CONFIG_KGDB_KDB */
  81 static inline int kdb_stub(struct kgdb_state *ks)
  82 {
  83         return DBG_PASS_EVENT;
  84 }
  85 #endif /* CONFIG_KGDB_KDB */
  86
  87 #endif /* _DEBUG_CORE_H_ */