1 /*
2 * Xtensa hardware breakpoints/watchpoints handling functions
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
6 * for more details.
7 *
8 * Copyright (C) 2016 Cadence Design Systems Inc.
9 */
10
11 #ifndef __ASM_XTENSA_HW_BREAKPOINT_H
12 #define __ASM_XTENSA_HW_BREAKPOINT_H
13
14 #ifdef CONFIG_HAVE_HW_BREAKPOINT
15
16 #include <linux/kdebug.h>
17 #include <linux/types.h>
18 #include <uapi/linux/hw_breakpoint.h>
19
20 /* Breakpoint */
21 #define XTENSA_BREAKPOINT_EXECUTE 0
22
23 /* Watchpoints */
24 #define XTENSA_BREAKPOINT_LOAD 1
25 #define XTENSA_BREAKPOINT_STORE 2
26
27 struct arch_hw_breakpoint {
28 unsigned long address;
29 u16 len;
30 u16 type;
31 };
32
33 struct perf_event_attr;
34 struct perf_event;
35 struct pt_regs;
36 struct task_struct;
37
38 int hw_breakpoint_slots(int type);
39 int arch_check_bp_in_kernelspace(struct arch_hw_breakpoint *hw);
40 int hw_breakpoint_arch_parse(struct perf_event *bp,
41 const struct perf_event_attr *attr,
42 struct arch_hw_breakpoint *hw);
43 int hw_breakpoint_exceptions_notify(struct notifier_block *unused,
44 unsigned long val, void *data);
45
46 int arch_install_hw_breakpoint(struct perf_event *bp);
47 void arch_uninstall_hw_breakpoint(struct perf_event *bp);
48 void hw_breakpoint_pmu_read(struct perf_event *bp);
49 int check_hw_breakpoint(struct pt_regs *regs);
50 void clear_ptrace_hw_breakpoint(struct task_struct *tsk);
51 void restore_dbreak(void);
52
53 #else
54
55 struct task_struct;
56
57 static inline void clear_ptrace_hw_breakpoint(struct task_struct *tsk)
58 {
59 }
60
61 #endif /* CONFIG_HAVE_HW_BREAKPOINT */
62 #endif /* __ASM_XTENSA_HW_BREAKPOINT_H */
63
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