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__
27struct 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
55struct perf_event;
56struct pmu;
57struct perf_sample_data;
58
59#define HW_BREAKPOINT_ALIGN 0x7
60
61extern int hw_breakpoint_slots(int type);
62extern int arch_bp_generic_fields(int type, int *gen_bp_type);
63extern int arch_check_bp_in_kernelspace(struct perf_event *bp);
64extern int arch_validate_hwbkpt_settings(struct perf_event *bp);
65extern int hw_breakpoint_exceptions_notify(struct notifier_block *unused,
66						unsigned long val, void *data);
67int arch_install_hw_breakpoint(struct perf_event *bp);
68void arch_uninstall_hw_breakpoint(struct perf_event *bp);
69void hw_breakpoint_pmu_read(struct perf_event *bp);
70extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk);
71
72extern struct pmu perf_ops_bp;
73extern void ptrace_triggered(struct perf_event *bp,
74			struct perf_sample_data *data, struct pt_regs *regs);
75static 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}
84extern void thread_change_pc(struct task_struct *tsk, struct pt_regs *regs);
85
86#else	/* CONFIG_HAVE_HW_BREAKPOINT */
87static inline void hw_breakpoint_disable(void) { }
88static 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