2 * Copyright (C) 2012 ARM Ltd.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
16 #ifndef __ASM_DEBUG_MONITORS_H
17 #define __ASM_DEBUG_MONITORS_H
21 #define DBG_ESR_EVT(x) (((x) >> 27) & 0x7)
24 #define DBG_ESR_EVT_HWBP 0x0
25 #define DBG_ESR_EVT_HWSS 0x1
26 #define DBG_ESR_EVT_HWWP 0x2
27 #define DBG_ESR_EVT_BRK 0x6
30 * Break point instruction encoding
32 #define BREAK_INSTR_SIZE 4
35 * ESR values expected for dynamic and compile time BRK instruction
37 #define DBG_ESR_VAL_BRK(x) (0xf2000000 | ((x) & 0xfffff))
40 * #imm16 values used for BRK instruction generation
41 * Allowed values for kgbd are 0x400 - 0x7ff
42 * 0x400: for dynamic BRK instruction
43 * 0x401: for compile time BRK instruction
45 #define KGDB_DYN_DGB_BRK_IMM 0x400
46 #define KDBG_COMPILED_DBG_BRK_IMM 0x401
49 * BRK instruction encoding
50 * The #imm16 value should be placed at bits[20:5] within BRK ins
52 #define AARCH64_BREAK_MON 0xd4200000
55 * Extract byte from BRK instruction
57 #define KGDB_DYN_DGB_BRK_INS_BYTE(x) \
58 ((((AARCH64_BREAK_MON) & 0xffe0001f) >> (x * 8)) & 0xff)
61 * Extract byte from BRK #imm16
63 #define KGBD_DYN_DGB_BRK_IMM_BYTE(x) \
64 (((((KGDB_DYN_DGB_BRK_IMM) & 0xffff) << 5) >> (x * 8)) & 0xff)
66 #define KGDB_DYN_DGB_BRK_BYTE(x) \
67 (KGDB_DYN_DGB_BRK_INS_BYTE(x) | KGBD_DYN_DGB_BRK_IMM_BYTE(x))
69 #define KGDB_DYN_BRK_INS_BYTE0 KGDB_DYN_DGB_BRK_BYTE(0)
70 #define KGDB_DYN_BRK_INS_BYTE1 KGDB_DYN_DGB_BRK_BYTE(1)
71 #define KGDB_DYN_BRK_INS_BYTE2 KGDB_DYN_DGB_BRK_BYTE(2)
72 #define KGDB_DYN_BRK_INS_BYTE3 KGDB_DYN_DGB_BRK_BYTE(3)
74 #define CACHE_FLUSH_IS_SAFE 1
82 #define DBG_ESR_EVT_BKPT 0x4
83 #define DBG_ESR_EVT_VECC 0x5
85 #define AARCH32_BREAK_ARM 0x07f001f0
86 #define AARCH32_BREAK_THUMB 0xde01
87 #define AARCH32_BREAK_THUMB2_LO 0xf7f0
88 #define AARCH32_BREAK_THUMB2_HI 0xa000
93 #define DBG_ARCH_ID_RESERVED 0 /* In case of ptrace ABI updates. */
95 #define DBG_HOOK_HANDLED 0
96 #define DBG_HOOK_ERROR 1
99 struct list_head node
;
100 int (*fn
)(struct pt_regs
*regs
, unsigned int esr
);
103 void register_step_hook(struct step_hook
*hook
);
104 void unregister_step_hook(struct step_hook
*hook
);
107 struct list_head node
;
110 int (*fn
)(struct pt_regs
*regs
, unsigned int esr
);
113 void register_break_hook(struct break_hook
*hook
);
114 void unregister_break_hook(struct break_hook
*hook
);
116 u8
debug_monitors_arch(void);
118 void enable_debug_monitors(enum debug_el el
);
119 void disable_debug_monitors(enum debug_el el
);
121 void user_rewind_single_step(struct task_struct
*task
);
122 void user_fastforward_single_step(struct task_struct
*task
);
124 void kernel_enable_single_step(struct pt_regs
*regs
);
125 void kernel_disable_single_step(void);
126 int kernel_active_single_step(void);
128 #ifdef CONFIG_HAVE_HW_BREAKPOINT
129 int reinstall_suspended_bps(struct pt_regs
*regs
);
131 static inline int reinstall_suspended_bps(struct pt_regs
*regs
)
137 int aarch32_break_handler(struct pt_regs
*regs
);
139 #endif /* __ASSEMBLY */
140 #endif /* __KERNEL__ */
141 #endif /* __ASM_DEBUG_MONITORS_H */
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