xref: /kernel/linux/linux-6.6/arch/xtensa/include/asm/hw_breakpoint.h

/*
 * Xtensa hardware breakpoints/watchpoints handling functions
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2016 Cadence Design Systems Inc.
 */

#ifndef __ASM_XTENSA_HW_BREAKPOINT_H
#define __ASM_XTENSA_HW_BREAKPOINT_H

#ifdef CONFIG_HAVE_HW_BREAKPOINT

#include <linux/kdebug.h>
#include <linux/types.h>
#include <uapi/linux/hw_breakpoint.h>

/* Breakpoint */
#define XTENSA_BREAKPOINT_EXECUTE	0

/* Watchpoints */
#define XTENSA_BREAKPOINT_LOAD		1
#define XTENSA_BREAKPOINT_STORE		2

struct arch_hw_breakpoint {
	unsigned long address;
	u16 len;
	u16 type;
};

struct perf_event_attr;
struct perf_event;
struct pt_regs;
struct task_struct;

int hw_breakpoint_slots(int type);
int arch_check_bp_in_kernelspace(struct arch_hw_breakpoint *hw);
int hw_breakpoint_arch_parse(struct perf_event *bp,
			     const struct perf_event_attr *attr,
			     struct arch_hw_breakpoint *hw);
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 hw_breakpoint_pmu_read(struct perf_event *bp);
int check_hw_breakpoint(struct pt_regs *regs);
void clear_ptrace_hw_breakpoint(struct task_struct *tsk);
void restore_dbreak(void);

#else

struct task_struct;

static inline void clear_ptrace_hw_breakpoint(struct task_struct *tsk)
{
}

#endif /* CONFIG_HAVE_HW_BREAKPOINT */
#endif /* __ASM_XTENSA_HW_BREAKPOINT_H */