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hw_breakpoint.h
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1 /*
2  * PowerPC BookIII S hardware breakpoint definitions
3  *
4  * This program is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License as published by
6  * the Free Software Foundation; either version 2 of the License, or
7  * (at your option) any later version.
8  *
9  * This program is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program; if not, write to the Free Software
16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17  *
18  * Copyright 2010, IBM Corporation.
19  * Author: K.Prasad <[email protected]>
20  *
21  */
22 
23 #ifndef _PPC_BOOK3S_64_HW_BREAKPOINT_H
24 #define _PPC_BOOK3S_64_HW_BREAKPOINT_H
25 
26 #ifdef __KERNEL__
27 #ifdef CONFIG_HAVE_HW_BREAKPOINT
28 
29 struct arch_hw_breakpoint {
30  unsigned long address;
31  unsigned long dabrx;
32  int type;
33  u8 len; /* length of the target data symbol */
34  bool extraneous_interrupt;
35 };
36 
37 #include <linux/kdebug.h>
38 #include <asm/reg.h>
39 #include <asm/debug.h>
40 
41 struct perf_event;
42 struct pmu;
43 struct perf_sample_data;
44 
45 #define HW_BREAKPOINT_ALIGN 0x7
46 /* Maximum permissible length of any HW Breakpoint */
47 #define HW_BREAKPOINT_LEN 0x8
48 
49 extern int hw_breakpoint_slots(int type);
50 extern int arch_bp_generic_fields(int type, int *gen_bp_type);
51 extern int arch_check_bp_in_kernelspace(struct perf_event *bp);
52 extern int arch_validate_hwbkpt_settings(struct perf_event *bp);
54  unsigned long val, void *data);
57 void hw_breakpoint_pmu_read(struct perf_event *bp);
58 extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk);
59 
60 extern struct pmu perf_ops_bp;
61 extern void ptrace_triggered(struct perf_event *bp,
62  struct perf_sample_data *data, struct pt_regs *regs);
63 static inline void hw_breakpoint_disable(void)
64 {
65  set_dabr(0, 0);
66 }
67 extern void thread_change_pc(struct task_struct *tsk, struct pt_regs *regs);
68 
69 #else /* CONFIG_HAVE_HW_BREAKPOINT */
70 static inline void hw_breakpoint_disable(void) { }
71 static inline void thread_change_pc(struct task_struct *tsk,
72  struct pt_regs *regs) { }
73 #endif /* CONFIG_HAVE_HW_BREAKPOINT */
74 #endif /* __KERNEL__ */
75 #endif /* _PPC_BOOK3S_64_HW_BREAKPOINT_H */