1 /* 2 * Copyright (C) 2012 ARM Ltd. 3 * 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. 7 * 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. 12 * 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/>. 15 */ 16 #ifndef __ASM_DEBUG_MONITORS_H 17 #define __ASM_DEBUG_MONITORS_H 18 19 #ifdef __KERNEL__ 20 21 #define DBG_ESR_EVT(x) (((x) >> 27) & 0x7) 22 23 /* AArch64 */ 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 28 29 /* 30 * Break point instruction encoding 31 */ 32 #define BREAK_INSTR_SIZE 4 33 34 /* 35 * ESR values expected for dynamic and compile time BRK instruction 36 */ 37 #define DBG_ESR_VAL_BRK(x) (0xf2000000 | ((x) & 0xfffff)) 38 39 /* 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 44 */ 45 #define KGDB_DYN_DGB_BRK_IMM 0x400 46 #define KDBG_COMPILED_DBG_BRK_IMM 0x401 47 48 /* 49 * BRK instruction encoding 50 * The #imm16 value should be placed at bits[20:5] within BRK ins 51 */ 52 #define AARCH64_BREAK_MON 0xd4200000 53 54 /* 55 * Extract byte from BRK instruction 56 */ 57 #define KGDB_DYN_DGB_BRK_INS_BYTE(x) \ 58 ((((AARCH64_BREAK_MON) & 0xffe0001f) >> (x * 8)) & 0xff) 59 60 /* 61 * Extract byte from BRK #imm16 62 */ 63 #define KGBD_DYN_DGB_BRK_IMM_BYTE(x) \ 64 (((((KGDB_DYN_DGB_BRK_IMM) & 0xffff) << 5) >> (x * 8)) & 0xff) 65 66 #define KGDB_DYN_DGB_BRK_BYTE(x) \ 67 (KGDB_DYN_DGB_BRK_INS_BYTE(x) | KGBD_DYN_DGB_BRK_IMM_BYTE(x)) 68 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) 73 74 #define CACHE_FLUSH_IS_SAFE 1 75 76 enum debug_el { 77 DBG_ACTIVE_EL0 = 0, 78 DBG_ACTIVE_EL1, 79 }; 80 81 /* AArch32 */ 82 #define DBG_ESR_EVT_BKPT 0x4 83 #define DBG_ESR_EVT_VECC 0x5 84 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 89 90 #ifndef __ASSEMBLY__ 91 struct task_struct; 92 93 #define DBG_ARCH_ID_RESERVED 0 /* In case of ptrace ABI updates. */ 94 95 #define DBG_HOOK_HANDLED 0 96 #define DBG_HOOK_ERROR 1 97 98 struct step_hook { 99 struct list_head node; 100 int (*fn)(struct pt_regs *regs, unsigned int esr); 101 }; 102 103 void register_step_hook(struct step_hook *hook); 104 void unregister_step_hook(struct step_hook *hook); 105 106 struct break_hook { 107 struct list_head node; 108 u32 esr_val; 109 u32 esr_mask; 110 int (*fn)(struct pt_regs *regs, unsigned int esr); 111 }; 112 113 void register_break_hook(struct break_hook *hook); 114 void unregister_break_hook(struct break_hook *hook); 115 116 u8 debug_monitors_arch(void); 117 118 void enable_debug_monitors(enum debug_el el); 119 void disable_debug_monitors(enum debug_el el); 120 121 void user_rewind_single_step(struct task_struct *task); 122 void user_fastforward_single_step(struct task_struct *task); 123 124 void kernel_enable_single_step(struct pt_regs *regs); 125 void kernel_disable_single_step(void); 126 int kernel_active_single_step(void); 127 128 #ifdef CONFIG_HAVE_HW_BREAKPOINT 129 int reinstall_suspended_bps(struct pt_regs *regs); 130 #else 131 static inline int reinstall_suspended_bps(struct pt_regs *regs) 132 { 133 return -ENODEV; 134 } 135 #endif 136 137 int aarch32_break_handler(struct pt_regs *regs); 138 139 #endif /* __ASSEMBLY */ 140 #endif /* __KERNEL__ */ 141 #endif /* __ASM_DEBUG_MONITORS_H */ 142