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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Created by: Jason Wessel <[email protected]>
4 *
5 * Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved.
6 */
7
8#ifndef _DEBUG_CORE_H_
9#define _DEBUG_CORE_H_
10/*
11 * These are the private implementation headers between the kernel
12 * debugger core and the debugger front end code.
13 */
14
15/* kernel debug core data structures */
16struct kgdb_state {
17 int ex_vector;
18 int signo;
19 int err_code;
20 int cpu;
21 int pass_exception;
22 unsigned long thr_query;
23 unsigned long threadid;
24 long kgdb_usethreadid;
25 struct pt_regs *linux_regs;
26 atomic_t *send_ready;
27};
28
29/* Exception state values */
30#define DCPU_WANT_MASTER 0x1 /* Waiting to become a master kgdb cpu */
31#define DCPU_NEXT_MASTER 0x2 /* Transition from one master cpu to another */
32#define DCPU_IS_SLAVE 0x4 /* Slave cpu enter exception */
33#define DCPU_WANT_BT 0x8 /* Slave cpu should backtrace then clear flag */
34
35struct debuggerinfo_struct {
36 void *debuggerinfo;
37 struct task_struct *task;
38 int exception_state;
39 int ret_state;
40 int irq_depth;
41 int enter_kgdb;
42 bool rounding_up;
43};
44
45extern struct debuggerinfo_struct kgdb_info[];
46
47/* kernel debug core break point routines */
48extern int dbg_remove_all_break(void);
49extern int dbg_set_sw_break(unsigned long addr);
50extern int dbg_remove_sw_break(unsigned long addr);
51extern int dbg_activate_sw_breakpoints(void);
52extern int dbg_deactivate_sw_breakpoints(void);
53
54/* polled character access to i/o module */
55extern int dbg_io_get_char(void);
56
57/* stub return value for switching between the gdbstub and kdb */
58#define DBG_PASS_EVENT -12345
59/* Switch from one cpu to another */
60#define DBG_SWITCH_CPU_EVENT -123456
61extern int dbg_switch_cpu;
62
63/* gdbstub interface functions */
64extern int gdb_serial_stub(struct kgdb_state *ks);
65extern void gdbstub_msg_write(const char *s, int len);
66
67/* gdbstub functions used for kdb <-> gdbstub transition */
68extern int gdbstub_state(struct kgdb_state *ks, char *cmd);
69extern int dbg_kdb_mode;
70
71#ifdef CONFIG_KGDB_KDB
72extern int kdb_stub(struct kgdb_state *ks);
73extern int kdb_parse(const char *cmdstr);
74extern int kdb_common_init_state(struct kgdb_state *ks);
75extern int kdb_common_deinit_state(void);
76extern void kdb_dump_stack_on_cpu(int cpu);
77#else /* ! CONFIG_KGDB_KDB */
78static inline int kdb_stub(struct kgdb_state *ks)
79{
80 return DBG_PASS_EVENT;
81}
82#endif /* CONFIG_KGDB_KDB */
83
84#endif /* _DEBUG_CORE_H_ */