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 /* Low-level stepping controls. */ 22 #define DBG_MDSCR_SS (1 << 0) 23 #define DBG_SPSR_SS (1 << 21) 24 25 /* MDSCR_EL1 enabling bits */ 26 #define DBG_MDSCR_KDE (1 << 13) 27 #define DBG_MDSCR_MDE (1 << 15) 28 #define DBG_MDSCR_MASK ~(DBG_MDSCR_KDE | DBG_MDSCR_MDE) 29 30 #define DBG_ESR_EVT(x) (((x) >> 27) & 0x7) 31 32 /* AArch64 */ 33 #define DBG_ESR_EVT_HWBP 0x0 34 #define DBG_ESR_EVT_HWSS 0x1 35 #define DBG_ESR_EVT_HWWP 0x2 36 #define DBG_ESR_EVT_BRK 0x6 37 38 /* 39 * Break point instruction encoding 40 */ 41 #define BREAK_INSTR_SIZE 4 42 43 /* 44 * ESR values expected for dynamic and compile time BRK instruction 45 */ 46 #define DBG_ESR_VAL_BRK(x) (0xf2000000 | ((x) & 0xfffff)) 47 48 /* 49 * #imm16 values used for BRK instruction generation 50 * Allowed values for kgbd are 0x400 - 0x7ff 51 * 0x400: for dynamic BRK instruction 52 * 0x401: for compile time BRK instruction 53 */ 54 #define KGDB_DYN_DGB_BRK_IMM 0x400 55 #define KDBG_COMPILED_DBG_BRK_IMM 0x401 56 57 /* 58 * BRK instruction encoding 59 * The #imm16 value should be placed at bits[20:5] within BRK ins 60 */ 61 #define AARCH64_BREAK_MON 0xd4200000 62 63 /* 64 * Extract byte from BRK instruction 65 */ 66 #define KGDB_DYN_DGB_BRK_INS_BYTE(x) \ 67 ((((AARCH64_BREAK_MON) & 0xffe0001f) >> (x * 8)) & 0xff) 68 69 /* 70 * Extract byte from BRK #imm16 71 */ 72 #define KGBD_DYN_DGB_BRK_IMM_BYTE(x) \ 73 (((((KGDB_DYN_DGB_BRK_IMM) & 0xffff) << 5) >> (x * 8)) & 0xff) 74 75 #define KGDB_DYN_DGB_BRK_BYTE(x) \ 76 (KGDB_DYN_DGB_BRK_INS_BYTE(x) | KGBD_DYN_DGB_BRK_IMM_BYTE(x)) 77 78 #define KGDB_DYN_BRK_INS_BYTE0 KGDB_DYN_DGB_BRK_BYTE(0) 79 #define KGDB_DYN_BRK_INS_BYTE1 KGDB_DYN_DGB_BRK_BYTE(1) 80 #define KGDB_DYN_BRK_INS_BYTE2 KGDB_DYN_DGB_BRK_BYTE(2) 81 #define KGDB_DYN_BRK_INS_BYTE3 KGDB_DYN_DGB_BRK_BYTE(3) 82 83 #define CACHE_FLUSH_IS_SAFE 1 84 85 /* AArch32 */ 86 #define DBG_ESR_EVT_BKPT 0x4 87 #define DBG_ESR_EVT_VECC 0x5 88 89 #define AARCH32_BREAK_ARM 0x07f001f0 90 #define AARCH32_BREAK_THUMB 0xde01 91 #define AARCH32_BREAK_THUMB2_LO 0xf7f0 92 #define AARCH32_BREAK_THUMB2_HI 0xa000 93 94 #ifndef __ASSEMBLY__ 95 struct task_struct; 96 97 #define DBG_ARCH_ID_RESERVED 0 /* In case of ptrace ABI updates. */ 98 99 #define DBG_HOOK_HANDLED 0 100 #define DBG_HOOK_ERROR 1 101 102 struct step_hook { 103 struct list_head node; 104 int (*fn)(struct pt_regs *regs, unsigned int esr); 105 }; 106 107 void register_step_hook(struct step_hook *hook); 108 void unregister_step_hook(struct step_hook *hook); 109 110 struct break_hook { 111 struct list_head node; 112 u32 esr_val; 113 u32 esr_mask; 114 int (*fn)(struct pt_regs *regs, unsigned int esr); 115 }; 116 117 void register_break_hook(struct break_hook *hook); 118 void unregister_break_hook(struct break_hook *hook); 119 120 u8 debug_monitors_arch(void); 121 122 enum debug_el { 123 DBG_ACTIVE_EL0 = 0, 124 DBG_ACTIVE_EL1, 125 }; 126 127 void enable_debug_monitors(enum debug_el el); 128 void disable_debug_monitors(enum debug_el el); 129 130 void user_rewind_single_step(struct task_struct *task); 131 void user_fastforward_single_step(struct task_struct *task); 132 133 void kernel_enable_single_step(struct pt_regs *regs); 134 void kernel_disable_single_step(void); 135 int kernel_active_single_step(void); 136 137 #ifdef CONFIG_HAVE_HW_BREAKPOINT 138 int reinstall_suspended_bps(struct pt_regs *regs); 139 #else 140 static inline int reinstall_suspended_bps(struct pt_regs *regs) 141 { 142 return -ENODEV; 143 } 144 #endif 145 146 int aarch32_break_handler(struct pt_regs *regs); 147 148 #endif /* __ASSEMBLY */ 149 #endif /* __KERNEL__ */ 150 #endif /* __ASM_DEBUG_MONITORS_H */ 151