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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_SSTEP       0x8 /* CPU is single stepping */
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 };
46 
47 extern struct debuggerinfo_struct kgdb_info[];
48 
49 /* kernel debug core break point routines */
50 extern int dbg_remove_all_break(void);
51 extern int dbg_set_sw_break(unsigned long addr);
52 extern int dbg_remove_sw_break(unsigned long addr);
53 extern int dbg_activate_sw_breakpoints(void);
54 extern int dbg_deactivate_sw_breakpoints(void);
55 
56 /* polled character access to i/o module */
57 extern int dbg_io_get_char(void);
58 
59 /* stub return value for switching between the gdbstub and kdb */
60 #define DBG_PASS_EVENT -12345
61 /* Switch from one cpu to another */
62 #define DBG_SWITCH_CPU_EVENT -123456
63 extern int dbg_switch_cpu;
64 
65 /* gdbstub interface functions */
66 extern int gdb_serial_stub(struct kgdb_state *ks);
67 extern void gdbstub_msg_write(const char *s, int len);
68 
69 /* gdbstub functions used for kdb <-> gdbstub transition */
70 extern int gdbstub_state(struct kgdb_state *ks, char *cmd);
71 extern int dbg_kdb_mode;
72 
73 #ifdef CONFIG_KGDB_KDB
74 extern int kdb_stub(struct kgdb_state *ks);
75 extern int kdb_parse(const char *cmdstr);
76 extern int kdb_common_init_state(struct kgdb_state *ks);
77 extern int kdb_common_deinit_state(void);
78 #else /* ! CONFIG_KGDB_KDB */
kdb_stub(struct kgdb_state * ks)79 static inline int kdb_stub(struct kgdb_state *ks)
80 {
81 	return DBG_PASS_EVENT;
82 }
83 #endif /* CONFIG_KGDB_KDB */
84 
85 #endif /* _DEBUG_CORE_H_ */
86