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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _I386_HW_BREAKPOINT_H
#define _I386_HW_BREAKPOINT_H
#include <uapi/asm/hw_breakpoint.h>
* The name should probably be something dealt in
* a higher level. While dealing with the user
* (display/resolving)
struct arch_hw_breakpoint {
unsigned long address;
unsigned long mask;
u8 len;
u8 type;
#include <linux/kdebug.h>
#include <linux/percpu.h>
#include <linux/list.h>
/* Available HW breakpoint length encodings */
#define X86_BREAKPOINT_LEN_X 0x40
#define X86_BREAKPOINT_LEN_1 0x40
#define X86_BREAKPOINT_LEN_2 0x44
#define X86_BREAKPOINT_LEN_4 0x4c
#ifdef CONFIG_X86_64
#define X86_BREAKPOINT_LEN_8 0x48
/* Available HW breakpoint type encodings */
/* trigger on instruction execute */
/* trigger on memory write */
#define X86_BREAKPOINT_WRITE 0x81
/* trigger on memory read or write */
#define X86_BREAKPOINT_RW 0x83
/* Total number of available HW breakpoint registers */
#define HBP_NUM 4
static inline int hw_breakpoint_slots(int type)
return HBP_NUM;
struct perf_event_attr;
struct perf_event;
struct pmu;
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 hw_breakpoint_pmu_read(struct perf_event *bp);
void hw_breakpoint_pmu_unthrottle(struct perf_event *bp);
extern void
arch_fill_perf_breakpoint(struct perf_event *bp);
unsigned long encode_dr7(int drnum, unsigned int len, unsigned int type);
int decode_dr7(unsigned long dr7, int bpnum, unsigned *len, unsigned *type);
extern int arch_bp_generic_fields(int x86_len, int x86_type,
int *gen_len, int *gen_type);
extern struct pmu perf_ops_bp;
#endif /* _I386_HW_BREAKPOINT_H */