arch/powerpc/include/asm/hw_breakpoint.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * PowerPC BookIII S hardware breakpoint definitions
   4  *
   5  * Copyright 2010, IBM Corporation.
   6  * Author: K.Prasad <prasad@linux.vnet.ibm.com>
   7  */
   8
   9 #ifndef _PPC_BOOK3S_64_HW_BREAKPOINT_H
  10 #define _PPC_BOOK3S_64_HW_BREAKPOINT_H
  11
  12 #ifdef  __KERNEL__
  13 struct arch_hw_breakpoint {
  14         unsigned long   address;
  15         u16             type;
  16         u16             len; /* length of the target data symbol */
  17         u16             hw_len; /* length programmed in hw */
  18 };
  19
  20 /* Note: Don't change the the first 6 bits below as they are in the same order
  21  * as the dabr and dabrx.
  22  */
  23 #define HW_BRK_TYPE_READ                0x01
  24 #define HW_BRK_TYPE_WRITE               0x02
  25 #define HW_BRK_TYPE_TRANSLATE           0x04
  26 #define HW_BRK_TYPE_USER                0x08
  27 #define HW_BRK_TYPE_KERNEL              0x10
  28 #define HW_BRK_TYPE_HYP                 0x20
  29 #define HW_BRK_TYPE_EXTRANEOUS_IRQ      0x80
  30
  31 /* bits that overlap with the bottom 3 bits of the dabr */
  32 #define HW_BRK_TYPE_RDWR        (HW_BRK_TYPE_READ | HW_BRK_TYPE_WRITE)
  33 #define HW_BRK_TYPE_DABR        (HW_BRK_TYPE_RDWR | HW_BRK_TYPE_TRANSLATE)
  34 #define HW_BRK_TYPE_PRIV_ALL    (HW_BRK_TYPE_USER | HW_BRK_TYPE_KERNEL | \
  35                                  HW_BRK_TYPE_HYP)
  36
  37 /* Minimum granularity */
  38 #ifdef CONFIG_PPC_8xx
  39 #define HW_BREAKPOINT_SIZE  0x4
  40 #else
  41 #define HW_BREAKPOINT_SIZE  0x8
  42 #endif
  43
  44 #define DABR_MAX_LEN    8
  45 #define DAWR_MAX_LEN    512
  46
  47 static inline int nr_wp_slots(void)
  48 {
  49         return HBP_NUM_MAX;
  50 }
  51
  52 #ifdef CONFIG_HAVE_HW_BREAKPOINT
  53 #include <linux/kdebug.h>
  54 #include <asm/reg.h>
  55 #include <asm/debug.h>
  56
  57 struct perf_event_attr;
  58 struct perf_event;
  59 struct pmu;
  60 struct perf_sample_data;
  61 struct task_struct;
  62
  63 extern int hw_breakpoint_slots(int type);
  64 extern int arch_bp_generic_fields(int type, int *gen_bp_type);
  65 extern int arch_check_bp_in_kernelspace(struct arch_hw_breakpoint *hw);
  66 extern int hw_breakpoint_arch_parse(struct perf_event *bp,
  67                                     const struct perf_event_attr *attr,
  68                                     struct arch_hw_breakpoint *hw);
  69 extern int hw_breakpoint_exceptions_notify(struct notifier_block *unused,
  70                                                 unsigned long val, void *data);
  71 int arch_install_hw_breakpoint(struct perf_event *bp);
  72 void arch_uninstall_hw_breakpoint(struct perf_event *bp);
  73 int arch_reserve_bp_slot(struct perf_event *bp);
  74 void arch_release_bp_slot(struct perf_event *bp);
  75 void arch_unregister_hw_breakpoint(struct perf_event *bp);
  76 void hw_breakpoint_pmu_read(struct perf_event *bp);
  77 extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk);
  78
  79 extern struct pmu perf_ops_bp;
  80 extern void ptrace_triggered(struct perf_event *bp,
  81                         struct perf_sample_data *data, struct pt_regs *regs);
  82 static inline void hw_breakpoint_disable(void)
  83 {
  84         int i;
  85         struct arch_hw_breakpoint null_brk = {0};
  86
  87         if (!ppc_breakpoint_available())
  88                 return;
  89
  90         for (i = 0; i < nr_wp_slots(); i++)
  91                 __set_breakpoint(i, &null_brk);
  92 }
  93 extern void thread_change_pc(struct task_struct *tsk, struct pt_regs *regs);
  94 int hw_breakpoint_handler(struct die_args *args);
  95
  96 #else   /* CONFIG_HAVE_HW_BREAKPOINT */
  97 static inline void hw_breakpoint_disable(void) { }
  98 static inline void thread_change_pc(struct task_struct *tsk,
  99                                         struct pt_regs *regs) { }
 100
 101 #endif  /* CONFIG_HAVE_HW_BREAKPOINT */
 102
 103
 104 #ifdef CONFIG_PPC_DAWR
 105 extern bool dawr_force_enable;
 106 static inline bool dawr_enabled(void)
 107 {
 108         return dawr_force_enable;
 109 }
 110 int set_dawr(int nr, struct arch_hw_breakpoint *brk);
 111 #else
 112 static inline bool dawr_enabled(void) { return false; }
 113 static inline int set_dawr(int nr, struct arch_hw_breakpoint *brk) { return -1; }
 114 #endif
 115
 116 #endif  /* __KERNEL__ */
 117 #endif  /* _PPC_BOOK3S_64_HW_BREAKPOINT_H */