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 #define AARCH64_BREAK_KGDB_DYN_DBG \ 38 (AARCH64_BREAK_MON | (KGDB_DYN_DBG_BRK_IMM << 5)) 39 40 #define CACHE_FLUSH_IS_SAFE 1 41 42 /* kprobes BRK opcodes with ESR encoding */ 43 #define BRK64_OPCODE_KPROBES (AARCH64_BREAK_MON | (KPROBES_BRK_IMM << 5)) 44 #define BRK64_OPCODE_KPROBES_SS (AARCH64_BREAK_MON | (KPROBES_BRK_SS_IMM << 5)) 45 /* uprobes BRK opcodes with ESR encoding */ 46 #define BRK64_OPCODE_UPROBES (AARCH64_BREAK_MON | (UPROBES_BRK_IMM << 5)) 47 48 /* AArch32 */ 49 #define DBG_ESR_EVT_BKPT 0x4 50 #define DBG_ESR_EVT_VECC 0x5 51 52 #define AARCH32_BREAK_ARM 0x07f001f0 53 #define AARCH32_BREAK_THUMB 0xde01 54 #define AARCH32_BREAK_THUMB2_LO 0xf7f0 55 #define AARCH32_BREAK_THUMB2_HI 0xa000 56 57 #ifndef __ASSEMBLY__ 58 struct task_struct; 59 60 #define DBG_ARCH_ID_RESERVED 0 /* In case of ptrace ABI updates. */ 61 62 #define DBG_HOOK_HANDLED 0 63 #define DBG_HOOK_ERROR 1 64 65 struct step_hook { 66 struct list_head node; 67 int (*fn)(struct pt_regs *regs, unsigned long esr); 68 }; 69 70 void register_user_step_hook(struct step_hook *hook); 71 void unregister_user_step_hook(struct step_hook *hook); 72 73 void register_kernel_step_hook(struct step_hook *hook); 74 void unregister_kernel_step_hook(struct step_hook *hook); 75 76 struct break_hook { 77 struct list_head node; 78 int (*fn)(struct pt_regs *regs, unsigned long esr); 79 u16 imm; 80 u16 mask; /* These bits are ignored when comparing with imm */ 81 }; 82 83 void register_user_break_hook(struct break_hook *hook); 84 void unregister_user_break_hook(struct break_hook *hook); 85 86 void register_kernel_break_hook(struct break_hook *hook); 87 void unregister_kernel_break_hook(struct break_hook *hook); 88 89 u8 debug_monitors_arch(void); 90 91 enum dbg_active_el { 92 DBG_ACTIVE_EL0 = 0, 93 DBG_ACTIVE_EL1, 94 }; 95 96 void enable_debug_monitors(enum dbg_active_el el); 97 void disable_debug_monitors(enum dbg_active_el el); 98 99 void user_rewind_single_step(struct task_struct *task); 100 void user_fastforward_single_step(struct task_struct *task); 101 void user_regs_reset_single_step(struct user_pt_regs *regs, 102 struct task_struct *task); 103 104 void kernel_enable_single_step(struct pt_regs *regs); 105 void kernel_disable_single_step(void); 106 int kernel_active_single_step(void); 107 void kernel_rewind_single_step(struct pt_regs *regs); 108 109 #ifdef CONFIG_HAVE_HW_BREAKPOINT 110 int reinstall_suspended_bps(struct pt_regs *regs); 111 #else 112 static inline int reinstall_suspended_bps(struct pt_regs *regs) 113 { 114 return -ENODEV; 115 } 116 #endif 117 118 int aarch32_break_handler(struct pt_regs *regs); 119 120 void debug_traps_init(void); 121 122 #endif /* __ASSEMBLY */ 123 #endif /* __ASM_DEBUG_MONITORS_H */ 124