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 #include <linux/errno.h> 22 #include <linux/types.h> 23 #include <asm/brk-imm.h> 24 #include <asm/esr.h> 25 #include <asm/insn.h> 26 #include <asm/ptrace.h> 27 28 /* Low-level stepping controls. */ 29 #define DBG_MDSCR_SS (1 << 0) 30 #define DBG_SPSR_SS (1 << 21) 31 32 /* MDSCR_EL1 enabling bits */ 33 #define DBG_MDSCR_KDE (1 << 13) 34 #define DBG_MDSCR_MDE (1 << 15) 35 #define DBG_MDSCR_MASK ~(DBG_MDSCR_KDE | DBG_MDSCR_MDE) 36 37 #define DBG_ESR_EVT(x) (((x) >> 27) & 0x7) 38 39 /* AArch64 */ 40 #define DBG_ESR_EVT_HWBP 0x0 41 #define DBG_ESR_EVT_HWSS 0x1 42 #define DBG_ESR_EVT_HWWP 0x2 43 #define DBG_ESR_EVT_BRK 0x6 44 45 /* 46 * Break point instruction encoding 47 */ 48 #define BREAK_INSTR_SIZE AARCH64_INSN_SIZE 49 50 /* 51 * BRK instruction encoding 52 * The #imm16 value should be placed at bits[20:5] within BRK ins 53 */ 54 #define AARCH64_BREAK_MON 0xd4200000 55 56 /* 57 * BRK instruction for provoking a fault on purpose 58 * Unlike kgdb, #imm16 value with unallocated handler is used for faulting. 59 */ 60 #define AARCH64_BREAK_FAULT (AARCH64_BREAK_MON | (FAULT_BRK_IMM << 5)) 61 62 #define AARCH64_BREAK_KGDB_DYN_DBG \ 63 (AARCH64_BREAK_MON | (KGDB_DYN_DBG_BRK_IMM << 5)) 64 65 #define CACHE_FLUSH_IS_SAFE 1 66 67 /* kprobes BRK opcodes with ESR encoding */ 68 #define BRK64_ESR_MASK 0xFFFF 69 #define BRK64_ESR_KPROBES 0x0004 70 #define BRK64_OPCODE_KPROBES (AARCH64_BREAK_MON | (BRK64_ESR_KPROBES << 5)) 71 /* uprobes BRK opcodes with ESR encoding */ 72 #define BRK64_ESR_UPROBES 0x0005 73 #define BRK64_OPCODE_UPROBES (AARCH64_BREAK_MON | (BRK64_ESR_UPROBES << 5)) 74 75 /* AArch32 */ 76 #define DBG_ESR_EVT_BKPT 0x4 77 #define DBG_ESR_EVT_VECC 0x5 78 79 #define AARCH32_BREAK_ARM 0x07f001f0 80 #define AARCH32_BREAK_THUMB 0xde01 81 #define AARCH32_BREAK_THUMB2_LO 0xf7f0 82 #define AARCH32_BREAK_THUMB2_HI 0xa000 83 84 #ifndef __ASSEMBLY__ 85 struct task_struct; 86 87 #define DBG_ARCH_ID_RESERVED 0 /* In case of ptrace ABI updates. */ 88 89 #define DBG_HOOK_HANDLED 0 90 #define DBG_HOOK_ERROR 1 91 92 struct step_hook { 93 struct list_head node; 94 int (*fn)(struct pt_regs *regs, unsigned int esr); 95 }; 96 97 void register_step_hook(struct step_hook *hook); 98 void unregister_step_hook(struct step_hook *hook); 99 100 struct break_hook { 101 struct list_head node; 102 u32 esr_val; 103 u32 esr_mask; 104 int (*fn)(struct pt_regs *regs, unsigned int esr); 105 }; 106 107 void register_break_hook(struct break_hook *hook); 108 void unregister_break_hook(struct break_hook *hook); 109 110 u8 debug_monitors_arch(void); 111 112 enum dbg_active_el { 113 DBG_ACTIVE_EL0 = 0, 114 DBG_ACTIVE_EL1, 115 }; 116 117 void enable_debug_monitors(enum dbg_active_el el); 118 void disable_debug_monitors(enum dbg_active_el el); 119 120 void user_rewind_single_step(struct task_struct *task); 121 void user_fastforward_single_step(struct task_struct *task); 122 123 void kernel_enable_single_step(struct pt_regs *regs); 124 void kernel_disable_single_step(void); 125 int kernel_active_single_step(void); 126 127 #ifdef CONFIG_HAVE_HW_BREAKPOINT 128 int reinstall_suspended_bps(struct pt_regs *regs); 129 #else 130 static inline int reinstall_suspended_bps(struct pt_regs *regs) 131 { 132 return -ENODEV; 133 } 134 #endif 135 136 int aarch32_break_handler(struct pt_regs *regs); 137 138 #endif /* __ASSEMBLY */ 139 #endif /* __KERNEL__ */ 140 #endif /* __ASM_DEBUG_MONITORS_H */ 141