arch/arm/include/asm/hw_breakpoint.h

   1 #ifndef _ARM_HW_BREAKPOINT_H
   2 #define _ARM_HW_BREAKPOINT_H
   3
   4 #ifdef __KERNEL__
   5
   6 struct task_struct;
   7
   8 #ifdef CONFIG_HAVE_HW_BREAKPOINT
   9
  10 struct arch_hw_breakpoint_ctrl {
  11                 u32 __reserved  : 9,
  12                 mismatch        : 1,
  13                                 : 9,
  14                 len             : 8,
  15                 type            : 2,
  16                 privilege       : 2,
  17                 enabled         : 1;
  18 };
  19
  20 struct arch_hw_breakpoint {
  21         u32     address;
  22         u32     trigger;
  23         struct  arch_hw_breakpoint_ctrl step_ctrl;
  24         struct  arch_hw_breakpoint_ctrl ctrl;
  25 };
  26
  27 static inline u32 encode_ctrl_reg(struct arch_hw_breakpoint_ctrl ctrl)
  28 {
  29         return (ctrl.mismatch << 22) | (ctrl.len << 5) | (ctrl.type << 3) |
  30                 (ctrl.privilege << 1) | ctrl.enabled;
  31 }
  32
  33 static inline void decode_ctrl_reg(u32 reg,
  34                                    struct arch_hw_breakpoint_ctrl *ctrl)
  35 {
  36         ctrl->enabled   = reg & 0x1;
  37         reg >>= 1;
  38         ctrl->privilege = reg & 0x3;
  39         reg >>= 2;
  40         ctrl->type      = reg & 0x3;
  41         reg >>= 2;
  42         ctrl->len       = reg & 0xff;
  43         reg >>= 17;
  44         ctrl->mismatch  = reg & 0x1;
  45 }
  46
  47 /* Debug architecture numbers. */
  48 #define ARM_DEBUG_ARCH_RESERVED 0       /* In case of ptrace ABI updates. */
  49 #define ARM_DEBUG_ARCH_V6       1
  50 #define ARM_DEBUG_ARCH_V6_1     2
  51 #define ARM_DEBUG_ARCH_V7_ECP14 3
  52 #define ARM_DEBUG_ARCH_V7_MM    4
  53 #define ARM_DEBUG_ARCH_V7_1     5
  54
  55 /* Breakpoint */
  56 #define ARM_BREAKPOINT_EXECUTE  0
  57
  58 /* Watchpoints */
  59 #define ARM_BREAKPOINT_LOAD     1
  60 #define ARM_BREAKPOINT_STORE    2
  61
  62 /* Privilege Levels */
  63 #define ARM_BREAKPOINT_PRIV     1
  64 #define ARM_BREAKPOINT_USER     2
  65
  66 /* Lengths */
  67 #define ARM_BREAKPOINT_LEN_1    0x1
  68 #define ARM_BREAKPOINT_LEN_2    0x3
  69 #define ARM_BREAKPOINT_LEN_4    0xf
  70 #define ARM_BREAKPOINT_LEN_8    0xff
  71
  72 /* Limits */
  73 #define ARM_MAX_BRP             16
  74 #define ARM_MAX_WRP             16
  75 #define ARM_MAX_HBP_SLOTS       (ARM_MAX_BRP + ARM_MAX_WRP)
  76
  77 /* DSCR method of entry bits. */
  78 #define ARM_DSCR_MOE(x)                 ((x >> 2) & 0xf)
  79 #define ARM_ENTRY_BREAKPOINT            0x1
  80 #define ARM_ENTRY_ASYNC_WATCHPOINT      0x2
  81 #define ARM_ENTRY_SYNC_WATCHPOINT       0xa
  82
  83 /* DSCR monitor/halting bits. */
  84 #define ARM_DSCR_HDBGEN         (1 << 14)
  85 #define ARM_DSCR_MDBGEN         (1 << 15)
  86
  87 /* opcode2 numbers for the co-processor instructions. */
  88 #define ARM_OP2_BVR             4
  89 #define ARM_OP2_BCR             5
  90 #define ARM_OP2_WVR             6
  91 #define ARM_OP2_WCR             7
  92
  93 /* Base register numbers for the debug registers. */
  94 #define ARM_BASE_BVR            64
  95 #define ARM_BASE_BCR            80
  96 #define ARM_BASE_WVR            96
  97 #define ARM_BASE_WCR            112
  98
  99 /* Accessor macros for the debug registers. */
 100 #define ARM_DBG_READ(M, OP2, VAL) do {\
 101         asm volatile("mrc p14, 0, %0, c0," #M ", " #OP2 : "=r" (VAL));\
 102 } while (0)
 103
 104 #define ARM_DBG_WRITE(M, OP2, VAL) do {\
 105         asm volatile("mcr p14, 0, %0, c0," #M ", " #OP2 : : "r" (VAL));\
 106 } while (0)
 107
 108 struct notifier_block;
 109 struct perf_event;
 110 struct pmu;
 111
 112 extern struct pmu perf_ops_bp;
 113 extern int arch_bp_generic_fields(struct arch_hw_breakpoint_ctrl ctrl,
 114                                   int *gen_len, int *gen_type);
 115 extern int arch_check_bp_in_kernelspace(struct perf_event *bp);
 116 extern int arch_validate_hwbkpt_settings(struct perf_event *bp);
 117 extern int hw_breakpoint_exceptions_notify(struct notifier_block *unused,
 118                                            unsigned long val, void *data);
 119
 120 extern u8 arch_get_debug_arch(void);
 121 extern u8 arch_get_max_wp_len(void);
 122 extern void clear_ptrace_hw_breakpoint(struct task_struct *tsk);
 123
 124 int arch_install_hw_breakpoint(struct perf_event *bp);
 125 void arch_uninstall_hw_breakpoint(struct perf_event *bp);
 126 void hw_breakpoint_pmu_read(struct perf_event *bp);
 127 int hw_breakpoint_slots(int type);
 128
 129 #else
 130 static inline void clear_ptrace_hw_breakpoint(struct task_struct *tsk) {}
 131
 132 #endif  /* CONFIG_HAVE_HW_BREAKPOINT */
 133 #endif  /* __KERNEL__ */
 134 #endif  /* _ARM_HW_BREAKPOINT_H */