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 <prasad@linux.vnet.ibm.com>
20  *
21  */
22 
23 #ifndef _PPC_BOOK3S_64_HW_BREAKPOINT_H
24 #define _PPC_BOOK3S_64_HW_BREAKPOINT_H
25 
26 #ifdef	__KERNEL__
27 struct arch_hw_breakpoint {
28 	unsigned long	address;
29 	u16		type;
30 	u16		len; /* length of the target data symbol */
31 };
32 
33 /* Note: Don't change the the first 6 bits below as they are in the same order
34  * as the dabr and dabrx.
35  */
36 #define HW_BRK_TYPE_READ		0x01
37 #define HW_BRK_TYPE_WRITE		0x02
38 #define HW_BRK_TYPE_TRANSLATE		0x04
39 #define HW_BRK_TYPE_USER		0x08
40 #define HW_BRK_TYPE_KERNEL		0x10
41 #define HW_BRK_TYPE_HYP			0x20
42 #define HW_BRK_TYPE_EXTRANEOUS_IRQ	0x80
43 
44 /* bits that overlap with the bottom 3 bits of the dabr */
45 #define HW_BRK_TYPE_RDWR	(HW_BRK_TYPE_READ | HW_BRK_TYPE_WRITE)
46 #define HW_BRK_TYPE_DABR	(HW_BRK_TYPE_RDWR | HW_BRK_TYPE_TRANSLATE)
47 #define HW_BRK_TYPE_PRIV_ALL	(HW_BRK_TYPE_USER | HW_BRK_TYPE_KERNEL | \
48 				 HW_BRK_TYPE_HYP)
49 
50 #ifdef CONFIG_HAVE_HW_BREAKPOINT
51 #include <linux/kdebug.h>
52 #include <asm/reg.h>
53 #include <asm/debug.h>
54 
55 struct perf_event;
56 struct pmu;
57 struct perf_sample_data;
58 
59 #define HW_BREAKPOINT_ALIGN 0x7
60 
61 extern int hw_breakpoint_slots(int type);
62 extern int arch_bp_generic_fields(int type, int *gen_bp_type);
63 extern int arch_check_bp_in_kernelspace(struct perf_event *bp);
64 extern int arch_validate_hwbkpt_settings(struct perf_event *bp);
65 extern int hw_breakpoint_exceptions_notify(struct notifier_block *unused,
66 						unsigned long val, void *data);
67 int arch_install_hw_breakpoint(struct perf_event *bp);
68 void arch_uninstall_hw_breakpoint(struct perf_event *bp);
69 void hw_breakpoint_pmu_read(struct perf_event *bp);
70 extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk);
71 
72 extern struct pmu perf_ops_bp;
73 extern void ptrace_triggered(struct perf_event *bp,
74 			struct perf_sample_data *data, struct pt_regs *regs);
75 static inline void hw_breakpoint_disable(void)
76 {
77 	struct arch_hw_breakpoint brk;
78 
79 	brk.address = 0;
80 	brk.type = 0;
81 	brk.len = 0;
82 	__set_breakpoint(&brk);
83 }
84 extern void thread_change_pc(struct task_struct *tsk, struct pt_regs *regs);
85 
86 #else	/* CONFIG_HAVE_HW_BREAKPOINT */
87 static inline void hw_breakpoint_disable(void) { }
88 static inline void thread_change_pc(struct task_struct *tsk,
89 					struct pt_regs *regs) { }
90 #endif	/* CONFIG_HAVE_HW_BREAKPOINT */
91 #endif	/* __KERNEL__ */
92 #endif	/* _PPC_BOOK3S_64_HW_BREAKPOINT_H */
93