LXR linux/arch/x86/include/asm/hw

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _I386_HW_BREAKPOINT_H
   3#define _I386_HW_BREAKPOINT_H
   4
   5#include <uapi/asm/hw_breakpoint.h>
   6
   7#define __ARCH_HW_BREAKPOINT_H
   8
   9/*
  10 * The name should probably be something dealt in
  11 * a higher level. While dealing with the user
  12 * (display/resolving)
  13 */
  14struct arch_hw_breakpoint {
  15        unsigned long   address;
  16        unsigned long   mask;
  17        u8              len;
  18        u8              type;
  19};
  20
  21#include <linux/kdebug.h>
  22#include <linux/percpu.h>
  23#include <linux/list.h>
  24
  25/* Available HW breakpoint length encodings */
  26#define X86_BREAKPOINT_LEN_X            0x40
  27#define X86_BREAKPOINT_LEN_1            0x40
  28#define X86_BREAKPOINT_LEN_2            0x44
  29#define X86_BREAKPOINT_LEN_4            0x4c
  30
  31#ifdef CONFIG_X86_64
  32#define X86_BREAKPOINT_LEN_8            0x48
  33#endif
  34
  35/* Available HW breakpoint type encodings */
  36
  37/* trigger on instruction execute */
  38#define X86_BREAKPOINT_EXECUTE  0x80
  39/* trigger on memory write */
  40#define X86_BREAKPOINT_WRITE    0x81
  41/* trigger on memory read or write */
  42#define X86_BREAKPOINT_RW       0x83
  43
  44/* Total number of available HW breakpoint registers */
  45#define HBP_NUM 4
  46
  47static inline int hw_breakpoint_slots(int type)
  48{
  49        return HBP_NUM;
  50}
  51
  52struct perf_event_attr;
  53struct perf_event;
  54struct pmu;
  55
  56extern int arch_check_bp_in_kernelspace(struct arch_hw_breakpoint *hw);
  57extern int hw_breakpoint_arch_parse(struct perf_event *bp,
  58                                    const struct perf_event_attr *attr,
  59                                    struct arch_hw_breakpoint *hw);
  60extern int hw_breakpoint_exceptions_notify(struct notifier_block *unused,
  61                                           unsigned long val, void *data);
  62
  63
  64int arch_install_hw_breakpoint(struct perf_event *bp);
  65void arch_uninstall_hw_breakpoint(struct perf_event *bp);
  66void hw_breakpoint_pmu_read(struct perf_event *bp);
  67void hw_breakpoint_pmu_unthrottle(struct perf_event *bp);
  68
  69extern void
  70arch_fill_perf_breakpoint(struct perf_event *bp);
  71
  72unsigned long encode_dr7(int drnum, unsigned int len, unsigned int type);
  73int decode_dr7(unsigned long dr7, int bpnum, unsigned *len, unsigned *type);
  74
  75extern int arch_bp_generic_fields(int x86_len, int x86_type,
  76                                  int *gen_len, int *gen_type);
  77
  78extern struct pmu perf_ops_bp;
  79
  80#endif  /* _I386_HW_BREAKPOINT_H */
  81