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