[linux-2.6-block.git] / arch / powerpc / include / asm / hw_breakpoint.h

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * PowerPC BookIII S hardware breakpoint definitions
 *
 * Copyright 2010, IBM Corporation.
 * Author: K.Prasad <prasad@linux.vnet.ibm.com>
 */

#ifndef _PPC_BOOK3S_64_HW_BREAKPOINT_H
#define _PPC_BOOK3S_64_HW_BREAKPOINT_H

#ifdef	__KERNEL__
struct arch_hw_breakpoint {
	unsigned long	address;
	u16		type;
	u16		len; /* length of the target data symbol */
};

/* Note: Don't change the the first 6 bits below as they are in the same order
 * as the dabr and dabrx.
 */
#define HW_BRK_TYPE_READ		0x01
#define HW_BRK_TYPE_WRITE		0x02
#define HW_BRK_TYPE_TRANSLATE		0x04
#define HW_BRK_TYPE_USER		0x08
#define HW_BRK_TYPE_KERNEL		0x10
#define HW_BRK_TYPE_HYP			0x20
#define HW_BRK_TYPE_EXTRANEOUS_IRQ	0x80

/* bits that overlap with the bottom 3 bits of the dabr */
#define HW_BRK_TYPE_RDWR	(HW_BRK_TYPE_READ | HW_BRK_TYPE_WRITE)
#define HW_BRK_TYPE_DABR	(HW_BRK_TYPE_RDWR | HW_BRK_TYPE_TRANSLATE)
#define HW_BRK_TYPE_PRIV_ALL	(HW_BRK_TYPE_USER | HW_BRK_TYPE_KERNEL | \
				 HW_BRK_TYPE_HYP)

#ifdef CONFIG_HAVE_HW_BREAKPOINT
#include <linux/kdebug.h>
#include <asm/reg.h>
#include <asm/debug.h>

struct perf_event_attr;
struct perf_event;
struct pmu;
struct perf_sample_data;
struct task_struct;

#define HW_BREAKPOINT_ALIGN 0x7

extern int hw_breakpoint_slots(int type);
extern int arch_bp_generic_fields(int type, int *gen_bp_type);
extern int arch_check_bp_in_kernelspace(struct arch_hw_breakpoint *hw);
extern int hw_breakpoint_arch_parse(struct perf_event *bp,
				    const struct perf_event_attr *attr,
				    struct arch_hw_breakpoint *hw);
extern int hw_breakpoint_exceptions_notify(struct notifier_block *unused,
						unsigned long val, void *data);
int arch_install_hw_breakpoint(struct perf_event *bp);
void arch_uninstall_hw_breakpoint(struct perf_event *bp);
void arch_unregister_hw_breakpoint(struct perf_event *bp);
void hw_breakpoint_pmu_read(struct perf_event *bp);
extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk);

extern struct pmu perf_ops_bp;
extern void ptrace_triggered(struct perf_event *bp,
			struct perf_sample_data *data, struct pt_regs *regs);
static inline void hw_breakpoint_disable(void)
{
	struct arch_hw_breakpoint brk;

	brk.address = 0;
	brk.type = 0;
	brk.len = 0;
	if (ppc_breakpoint_available())
		__set_breakpoint(&brk);
}
extern void thread_change_pc(struct task_struct *tsk, struct pt_regs *regs);
int hw_breakpoint_handler(struct die_args *args);

#else	/* CONFIG_HAVE_HW_BREAKPOINT */
static inline void hw_breakpoint_disable(void) { }
static inline void thread_change_pc(struct task_struct *tsk,
					struct pt_regs *regs) { }

#endif	/* CONFIG_HAVE_HW_BREAKPOINT */


#ifdef CONFIG_PPC_DAWR
extern bool dawr_force_enable;
static inline bool dawr_enabled(void)
{
	return dawr_force_enable;
}
int set_dawr(struct arch_hw_breakpoint *brk);
#else
static inline bool dawr_enabled(void) { return false; }
static inline int set_dawr(struct arch_hw_breakpoint *brk) { return -1; }
#endif

#endif	/* __KERNEL__ */
#endif	/* _PPC_BOOK3S_64_HW_BREAKPOINT_H */
Commit	Line	Data
1a59d1b8	1	/* SPDX-License-Identifier: GPL-2.0-or-later */
5aae8a53 P	2	/*
	3	* PowerPC BookIII S hardware breakpoint definitions
	4	*
5aae8a53 P	5	* Copyright 2010, IBM Corporation.
5aae8a53 P	6	* Author: K.Prasad <prasad@linux.vnet.ibm.com>
5aae8a53 P	7	*/
	8
	9	#ifndef _PPC_BOOK3S_64_HW_BREAKPOINT_H
	10	#define _PPC_BOOK3S_64_HW_BREAKPOINT_H
	11
	12	#ifdef __KERNEL__
5aae8a53	13	struct arch_hw_breakpoint {
5aae8a53	14	unsigned long address;
9422de3e MN	15	u16 type;
9422de3e MN	16	u16 len; /* length of the target data symbol */
5aae8a53 P	17	};
5aae8a53 P	18
9422de3e MN	19	/* Note: Don't change the the first 6 bits below as they are in the same order
	20	* as the dabr and dabrx.
	21	*/
	22	#define HW_BRK_TYPE_READ 0x01
	23	#define HW_BRK_TYPE_WRITE 0x02
	24	#define HW_BRK_TYPE_TRANSLATE 0x04
	25	#define HW_BRK_TYPE_USER 0x08
	26	#define HW_BRK_TYPE_KERNEL 0x10
	27	#define HW_BRK_TYPE_HYP 0x20
	28	#define HW_BRK_TYPE_EXTRANEOUS_IRQ 0x80
	29
	30	/* bits that overlap with the bottom 3 bits of the dabr */
	31	#define HW_BRK_TYPE_RDWR (HW_BRK_TYPE_READ \| HW_BRK_TYPE_WRITE)
	32	#define HW_BRK_TYPE_DABR (HW_BRK_TYPE_RDWR \| HW_BRK_TYPE_TRANSLATE)
	33	#define HW_BRK_TYPE_PRIV_ALL (HW_BRK_TYPE_USER \| HW_BRK_TYPE_KERNEL \| \
	34	HW_BRK_TYPE_HYP)
	35
	36	#ifdef CONFIG_HAVE_HW_BREAKPOINT
5aae8a53 P	37	#include <linux/kdebug.h>
5aae8a53 P	38	#include <asm/reg.h>
ae3a197e	39	#include <asm/debug.h>
5aae8a53	40
5d5176ba	41	struct perf_event_attr;
5aae8a53 P	42	struct perf_event;
	43	struct pmu;
	44	struct perf_sample_data;
62b84265	45	struct task_struct;
5aae8a53 P	46
5aae8a53 P	47	#define HW_BREAKPOINT_ALIGN 0x7
5aae8a53	48
d09ec738	49	extern int hw_breakpoint_slots(int type);
5aae8a53	50	extern int arch_bp_generic_fields(int type, int *gen_bp_type);
8e983ff9	51	extern int arch_check_bp_in_kernelspace(struct arch_hw_breakpoint *hw);
5d5176ba FW	52	extern int hw_breakpoint_arch_parse(struct perf_event *bp,
	53	const struct perf_event_attr *attr,
	54	struct arch_hw_breakpoint *hw);
5aae8a53 P	55	extern int hw_breakpoint_exceptions_notify(struct notifier_block *unused,
	56	unsigned long val, void *data);
	57	int arch_install_hw_breakpoint(struct perf_event *bp);
	58	void arch_uninstall_hw_breakpoint(struct perf_event *bp);
b0d876da	59	void arch_unregister_hw_breakpoint(struct perf_event *bp);
5aae8a53 P	60	void hw_breakpoint_pmu_read(struct perf_event *bp);
	61	extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk);
	62
	63	extern struct pmu perf_ops_bp;
29dfc4fd	64	extern void ptrace_triggered(struct perf_event *bp,
5aae8a53 P	65	struct perf_sample_data data, struct pt_regs regs);
	66	static inline void hw_breakpoint_disable(void)
	67	{
9422de3e MN	68	struct arch_hw_breakpoint brk;
	69
	70	brk.address = 0;
	71	brk.type = 0;
	72	brk.len = 0;
5d6a03eb NR	73	if (ppc_breakpoint_available())
5d6a03eb NR	74	__set_breakpoint(&brk);
5aae8a53	75	}
06532a67	76	extern void thread_change_pc(struct task_struct tsk, struct pt_regs regs);
b0d876da	77	int hw_breakpoint_handler(struct die_args *args);
5aae8a53	78
a278e7ea MN	79	#else /* CONFIG_HAVE_HW_BREAKPOINT */
	80	static inline void hw_breakpoint_disable(void) { }
	81	static inline void thread_change_pc(struct task_struct *tsk,
	82	struct pt_regs *regs) { }
	83
	84	#endif /* CONFIG_HAVE_HW_BREAKPOINT */
	85
	86
	87	#ifdef CONFIG_PPC_DAWR
c1fe190c MN	88	extern bool dawr_force_enable;
	89	static inline bool dawr_enabled(void)
	90	{
	91	return dawr_force_enable;
	92	}
a278e7ea MN	93	int set_dawr(struct arch_hw_breakpoint *brk);
a278e7ea MN	94	#else
c1fe190c	95	static inline bool dawr_enabled(void) { return false; }
a278e7ea MN	96	static inline int set_dawr(struct arch_hw_breakpoint *brk) { return -1; }
	97	#endif
	98
5aae8a53 P	99	#endif /* __KERNEL__ */
5aae8a53 P	100	#endif /* _PPC_BOOK3S_64_HW_BREAKPOINT_H */