1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) 2012 ARM Ltd. 4 */ 5 #ifndef __ASM_DEBUG_MONITORS_H 6 #define __ASM_DEBUG_MONITORS_H 7 8 #include <linux/errno.h> 9 #include <linux/types.h> 10 #include <asm/brk-imm.h> 11 #include <asm/esr.h> 12 #include <asm/insn.h> 13 #include <asm/ptrace.h> 14 15 /* Low-level stepping controls. */ 16 #define DBG_MDSCR_SS (1 << 0) 17 #define DBG_SPSR_SS (1 << 21) 18 19 /* MDSCR_EL1 enabling bits */ 20 #define DBG_MDSCR_KDE (1 << 13) 21 #define DBG_MDSCR_MDE (1 << 15) 22 #define DBG_MDSCR_MASK ~(DBG_MDSCR_KDE | DBG_MDSCR_MDE) 23 24 #define DBG_ESR_EVT(x) (((x) >> 27) & 0x7) 25 26 /* AArch64 */ 27 #define DBG_ESR_EVT_HWBP 0x0 28 #define DBG_ESR_EVT_HWSS 0x1 29 #define DBG_ESR_EVT_HWWP 0x2 30 #define DBG_ESR_EVT_BRK 0x6 31 32 /* 33 * Break point instruction encoding 34 */ 35 #define BREAK_INSTR_SIZE AARCH64_INSN_SIZE 36 37 /* 38 * BRK instruction encoding 39 * The #imm16 value should be placed at bits[20:5] within BRK ins 40 */ 41 #define AARCH64_BREAK_MON 0xd4200000 42 43 /* 44 * BRK instruction for provoking a fault on purpose 45 * Unlike kgdb, #imm16 value with unallocated handler is used for faulting. 46 */ 47 #define AARCH64_BREAK_FAULT (AARCH64_BREAK_MON | (FAULT_BRK_IMM << 5)) 48 49 #define AARCH64_BREAK_KGDB_DYN_DBG \ 50 (AARCH64_BREAK_MON | (KGDB_DYN_DBG_BRK_IMM << 5)) 51 52 #define CACHE_FLUSH_IS_SAFE 1 53 54 /* kprobes BRK opcodes with ESR encoding */ 55 #define BRK64_OPCODE_KPROBES (AARCH64_BREAK_MON | (KPROBES_BRK_IMM << 5)) 56 /* uprobes BRK opcodes with ESR encoding */ 57 #define BRK64_OPCODE_UPROBES (AARCH64_BREAK_MON | (UPROBES_BRK_IMM << 5)) 58 59 /* AArch32 */ 60 #define DBG_ESR_EVT_BKPT 0x4 61 #define DBG_ESR_EVT_VECC 0x5 62 63 #define AARCH32_BREAK_ARM 0x07f001f0 64 #define AARCH32_BREAK_THUMB 0xde01 65 #define AARCH32_BREAK_THUMB2_LO 0xf7f0 66 #define AARCH32_BREAK_THUMB2_HI 0xa000 67 68 #ifndef __ASSEMBLY__ 69 struct task_struct; 70 71 #define DBG_ARCH_ID_RESERVED 0 /* In case of ptrace ABI updates. */ 72 73 #define DBG_HOOK_HANDLED 0 74 #define DBG_HOOK_ERROR 1 75 76 struct step_hook { 77 struct list_head node; 78 int (*fn)(struct pt_regs *regs, unsigned int esr); 79 }; 80 81 void register_user_step_hook(struct step_hook *hook); 82 void unregister_user_step_hook(struct step_hook *hook); 83 84 void register_kernel_step_hook(struct step_hook *hook); 85 void unregister_kernel_step_hook(struct step_hook *hook); 86 87 struct break_hook { 88 struct list_head node; 89 int (*fn)(struct pt_regs *regs, unsigned int esr); 90 u16 imm; 91 u16 mask; /* These bits are ignored when comparing with imm */ 92 }; 93 94 void register_user_break_hook(struct break_hook *hook); 95 void unregister_user_break_hook(struct break_hook *hook); 96 97 void register_kernel_break_hook(struct break_hook *hook); 98 void unregister_kernel_break_hook(struct break_hook *hook); 99 100 u8 debug_monitors_arch(void); 101 102 enum dbg_active_el { 103 DBG_ACTIVE_EL0 = 0, 104 DBG_ACTIVE_EL1, 105 }; 106 107 void enable_debug_monitors(enum dbg_active_el el); 108 void disable_debug_monitors(enum dbg_active_el el); 109 110 void user_rewind_single_step(struct task_struct *task); 111 void user_fastforward_single_step(struct task_struct *task); 112 void user_regs_reset_single_step(struct user_pt_regs *regs, 113 struct task_struct *task); 114 115 void kernel_enable_single_step(struct pt_regs *regs); 116 void kernel_disable_single_step(void); 117 int kernel_active_single_step(void); 118 119 #ifdef CONFIG_HAVE_HW_BREAKPOINT 120 int reinstall_suspended_bps(struct pt_regs *regs); 121 #else 122 static inline int reinstall_suspended_bps(struct pt_regs *regs) 123 { 124 return -ENODEV; 125 } 126 #endif 127 128 int aarch32_break_handler(struct pt_regs *regs); 129 130 void debug_traps_init(void); 131 132 #endif /* __ASSEMBLY */ 133 #endif /* __ASM_DEBUG_MONITORS_H */ 134