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 };
  18
  19 /* Note: Don't change the the first 6 bits below as they are in the same order
  20  * as the dabr and dabrx.
  21  */
  22 #define HW_BRK_TYPE_READ                0x01
  23 #define HW_BRK_TYPE_WRITE               0x02
  24 #define HW_BRK_TYPE_TRANSLATE           0x04
  25 #define HW_BRK_TYPE_USER                0x08
  26 #define HW_BRK_TYPE_KERNEL              0x10
  27 #define HW_BRK_TYPE_HYP                 0x20
  28 #define HW_BRK_TYPE_EXTRANEOUS_IRQ      0x80
  29
  30 /* bits that overlap with the bottom 3 bits of the dabr */
  31 #define HW_BRK_TYPE_RDWR        (HW_BRK_TYPE_READ | HW_BRK_TYPE_WRITE)
  32 #define HW_BRK_TYPE_DABR        (HW_BRK_TYPE_RDWR | HW_BRK_TYPE_TRANSLATE)
  33 #define HW_BRK_TYPE_PRIV_ALL    (HW_BRK_TYPE_USER | HW_BRK_TYPE_KERNEL | \
  34                                  HW_BRK_TYPE_HYP)
  35
  36 #ifdef CONFIG_HAVE_HW_BREAKPOINT
  37 #include <linux/kdebug.h>
  38 #include <asm/reg.h>
  39 #include <asm/debug.h>
  40
  41 struct perf_event_attr;
  42 struct perf_event;
  43 struct pmu;
  44 struct perf_sample_data;
  45 struct task_struct;
  46
  47 #define HW_BREAKPOINT_ALIGN 0x7
  48
  49 extern int hw_breakpoint_slots(int type);
  50 extern int arch_bp_generic_fields(int type, int *gen_bp_type);
  51 extern int arch_check_bp_in_kernelspace(struct arch_hw_breakpoint *hw);
  52 extern int hw_breakpoint_arch_parse(struct perf_event *bp,
  53                                     const struct perf_event_attr *attr,
  54                                     struct arch_hw_breakpoint *hw);
  55 extern int hw_breakpoint_exceptions_notify(struct notifier_block *unused,
  56                                                 unsigned long val, void *data);
  57 int arch_install_hw_breakpoint(struct perf_event *bp);
  58 void arch_uninstall_hw_breakpoint(struct perf_event *bp);
  59 void arch_unregister_hw_breakpoint(struct perf_event *bp);
  60 void hw_breakpoint_pmu_read(struct perf_event *bp);
  61 extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk);
  62
  63 extern struct pmu perf_ops_bp;
  64 extern void ptrace_triggered(struct perf_event *bp,
  65                         struct perf_sample_data *data, struct pt_regs *regs);
  66 static inline void hw_breakpoint_disable(void)
  67 {
  68         struct arch_hw_breakpoint brk;
  69
  70         brk.address = 0;
  71         brk.type = 0;
  72         brk.len = 0;
  73         if (ppc_breakpoint_available())
  74                 __set_breakpoint(&brk);
  75 }
  76 extern void thread_change_pc(struct task_struct *tsk, struct pt_regs *regs);
  77 int hw_breakpoint_handler(struct die_args *args);
  78
  79 #else   /* CONFIG_HAVE_HW_BREAKPOINT */
  80 static inline void hw_breakpoint_disable(void) { }
  81 static inline void thread_change_pc(struct task_struct *tsk,
  82                                         struct pt_regs *regs) { }
  83
  84 #endif  /* CONFIG_HAVE_HW_BREAKPOINT */
  85
  86
  87 #ifdef CONFIG_PPC_DAWR
  88 extern bool dawr_force_enable;
  89 static inline bool dawr_enabled(void)
  90 {
  91         return dawr_force_enable;
  92 }
  93 int set_dawr(struct arch_hw_breakpoint *brk);
  94 #else
  95 static inline bool dawr_enabled(void) { return false; }
  96 static inline int set_dawr(struct arch_hw_breakpoint *brk) { return -1; }
  97 #endif
  98
  99 #endif  /* __KERNEL__ */
 100 #endif  /* _PPC_BOOK3S_64_HW_BREAKPOINT_H */