arch/x86/include/asm/hw_breakpoint.h

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