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 #ifdef CONFIG_PPC_8xx
  38 #define HW_BREAKPOINT_ALIGN 0x3
  39 #else
  40 #define HW_BREAKPOINT_ALIGN 0x7
  41 #endif
  42
  43 #define DABR_MAX_LEN    8
  44 #define DAWR_MAX_LEN    512
  45
  46 static inline int nr_wp_slots(void)
  47 {
  48         return HBP_NUM_MAX;
  49 }
  50
  51 #ifdef CONFIG_HAVE_HW_BREAKPOINT
  52 #include <linux/kdebug.h>
  53 #include <asm/reg.h>
  54 #include <asm/debug.h>
  55
  56 struct perf_event_attr;
  57 struct perf_event;
  58 struct pmu;
  59 struct perf_sample_data;
  60 struct task_struct;
  61
  62 extern int hw_breakpoint_slots(int type);
  63 extern int arch_bp_generic_fields(int type, int *gen_bp_type);
  64 extern int arch_check_bp_in_kernelspace(struct arch_hw_breakpoint *hw);
  65 extern int hw_breakpoint_arch_parse(struct perf_event *bp,
  66                                     const struct perf_event_attr *attr,
  67                                     struct arch_hw_breakpoint *hw);
  68 extern int hw_breakpoint_exceptions_notify(struct notifier_block *unused,
  69                                                 unsigned long val, void *data);
  70 int arch_install_hw_breakpoint(struct perf_event *bp);
  71 void arch_uninstall_hw_breakpoint(struct perf_event *bp);
  72 void arch_unregister_hw_breakpoint(struct perf_event *bp);
  73 void hw_breakpoint_pmu_read(struct perf_event *bp);
  74 extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk);
  75
  76 extern struct pmu perf_ops_bp;
  77 extern void ptrace_triggered(struct perf_event *bp,
  78                         struct perf_sample_data *data, struct pt_regs *regs);
  79 static inline void hw_breakpoint_disable(void)
  80 {
  81         int i;
  82         struct arch_hw_breakpoint null_brk = {0};
  83
  84         if (!ppc_breakpoint_available())
  85                 return;
  86
  87         for (i = 0; i < nr_wp_slots(); i++)
  88                 __set_breakpoint(i, &null_brk);
  89 }
  90 extern void thread_change_pc(struct task_struct *tsk, struct pt_regs *regs);
  91 int hw_breakpoint_handler(struct die_args *args);
  92
  93 #else   /* CONFIG_HAVE_HW_BREAKPOINT */
  94 static inline void hw_breakpoint_disable(void) { }
  95 static inline void thread_change_pc(struct task_struct *tsk,
  96                                         struct pt_regs *regs) { }
  97
  98 #endif  /* CONFIG_HAVE_HW_BREAKPOINT */
  99
 100
 101 #ifdef CONFIG_PPC_DAWR
 102 extern bool dawr_force_enable;
 103 static inline bool dawr_enabled(void)
 104 {
 105         return dawr_force_enable;
 106 }
 107 int set_dawr(int nr, struct arch_hw_breakpoint *brk);
 108 #else
 109 static inline bool dawr_enabled(void) { return false; }
 110 static inline int set_dawr(int nr, struct arch_hw_breakpoint *brk) { return -1; }
 111 #endif
 112
 113 #endif  /* __KERNEL__ */
 114 #endif  /* _PPC_BOOK3S_64_HW_BREAKPOINT_H */