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f81ef4a9 WD |
1 | #ifndef _ARM_HW_BREAKPOINT_H |
2 | #define _ARM_HW_BREAKPOINT_H | |
3 | ||
4 | #ifdef __KERNEL__ | |
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5 | |
6 | struct task_struct; | |
7 | ||
8 | #ifdef CONFIG_HAVE_HW_BREAKPOINT | |
9 | ||
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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; | |
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23 | struct arch_hw_breakpoint_ctrl step_ctrl; |
24 | struct arch_hw_breakpoint_ctrl ctrl; | |
f81ef4a9 WD |
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 | |
b5d5b8f9 | 53 | #define ARM_DEBUG_ARCH_V7_1 5 |
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54 | |
55 | /* Breakpoint */ | |
56 | #define ARM_BREAKPOINT_EXECUTE 0 | |
57 | ||
58 | /* Watchpoints */ | |
59 | #define ARM_BREAKPOINT_LOAD 1 | |
60 | #define ARM_BREAKPOINT_STORE 2 | |
6f26aa05 | 61 | #define ARM_FSR_ACCESS_MASK (1 << 11) |
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62 | |
63 | /* Privilege Levels */ | |
64 | #define ARM_BREAKPOINT_PRIV 1 | |
65 | #define ARM_BREAKPOINT_USER 2 | |
66 | ||
67 | /* Lengths */ | |
68 | #define ARM_BREAKPOINT_LEN_1 0x1 | |
69 | #define ARM_BREAKPOINT_LEN_2 0x3 | |
70 | #define ARM_BREAKPOINT_LEN_4 0xf | |
71 | #define ARM_BREAKPOINT_LEN_8 0xff | |
72 | ||
73 | /* Limits */ | |
74 | #define ARM_MAX_BRP 16 | |
75 | #define ARM_MAX_WRP 16 | |
76 | #define ARM_MAX_HBP_SLOTS (ARM_MAX_BRP + ARM_MAX_WRP) | |
77 | ||
78 | /* DSCR method of entry bits. */ | |
79 | #define ARM_DSCR_MOE(x) ((x >> 2) & 0xf) | |
80 | #define ARM_ENTRY_BREAKPOINT 0x1 | |
81 | #define ARM_ENTRY_ASYNC_WATCHPOINT 0x2 | |
82 | #define ARM_ENTRY_SYNC_WATCHPOINT 0xa | |
83 | ||
84 | /* DSCR monitor/halting bits. */ | |
85 | #define ARM_DSCR_HDBGEN (1 << 14) | |
86 | #define ARM_DSCR_MDBGEN (1 << 15) | |
87 | ||
88 | /* opcode2 numbers for the co-processor instructions. */ | |
89 | #define ARM_OP2_BVR 4 | |
90 | #define ARM_OP2_BCR 5 | |
91 | #define ARM_OP2_WVR 6 | |
92 | #define ARM_OP2_WCR 7 | |
93 | ||
94 | /* Base register numbers for the debug registers. */ | |
95 | #define ARM_BASE_BVR 64 | |
96 | #define ARM_BASE_BCR 80 | |
97 | #define ARM_BASE_WVR 96 | |
98 | #define ARM_BASE_WCR 112 | |
99 | ||
100 | /* Accessor macros for the debug registers. */ | |
101 | #define ARM_DBG_READ(M, OP2, VAL) do {\ | |
102 | asm volatile("mrc p14, 0, %0, c0," #M ", " #OP2 : "=r" (VAL));\ | |
103 | } while (0) | |
104 | ||
105 | #define ARM_DBG_WRITE(M, OP2, VAL) do {\ | |
106 | asm volatile("mcr p14, 0, %0, c0," #M ", " #OP2 : : "r" (VAL));\ | |
107 | } while (0) | |
108 | ||
109 | struct notifier_block; | |
110 | struct perf_event; | |
111 | struct pmu; | |
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112 | |
113 | extern struct pmu perf_ops_bp; | |
114 | extern int arch_bp_generic_fields(struct arch_hw_breakpoint_ctrl ctrl, | |
115 | int *gen_len, int *gen_type); | |
116 | extern int arch_check_bp_in_kernelspace(struct perf_event *bp); | |
117 | extern int arch_validate_hwbkpt_settings(struct perf_event *bp); | |
118 | extern int hw_breakpoint_exceptions_notify(struct notifier_block *unused, | |
119 | unsigned long val, void *data); | |
864232fa | 120 | |
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121 | extern u8 arch_get_debug_arch(void); |
122 | extern u8 arch_get_max_wp_len(void); | |
864232fa | 123 | extern void clear_ptrace_hw_breakpoint(struct task_struct *tsk); |
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124 | |
125 | int arch_install_hw_breakpoint(struct perf_event *bp); | |
126 | void arch_uninstall_hw_breakpoint(struct perf_event *bp); | |
127 | void hw_breakpoint_pmu_read(struct perf_event *bp); | |
128 | int hw_breakpoint_slots(int type); | |
129 | ||
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130 | #else |
131 | static inline void clear_ptrace_hw_breakpoint(struct task_struct *tsk) {} | |
132 | ||
133 | #endif /* CONFIG_HAVE_HW_BREAKPOINT */ | |
f81ef4a9 WD |
134 | #endif /* __KERNEL__ */ |
135 | #endif /* _ARM_HW_BREAKPOINT_H */ |