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_SPSR_SS (1 << 21) 17 18 #define DBG_ESR_EVT(x) (((x) >> 27) & 0x7) 19 20 /* AArch64 */ 21 #define DBG_ESR_EVT_HWBP 0x0 22 #define DBG_ESR_EVT_HWSS 0x1 23 #define DBG_ESR_EVT_HWWP 0x2 24 #define DBG_ESR_EVT_BRK 0x6 25 26 /* 27 * Break point instruction encoding 28 */ 29 #define BREAK_INSTR_SIZE AARCH64_INSN_SIZE 30 31 #define AARCH64_BREAK_KGDB_DYN_DBG \ 32 (AARCH64_BREAK_MON | (KGDB_DYN_DBG_BRK_IMM << 5)) 33 34 #define CACHE_FLUSH_IS_SAFE 1 35 36 /* kprobes BRK opcodes with ESR encoding */ 37 #define BRK64_OPCODE_KPROBES (AARCH64_BREAK_MON | (KPROBES_BRK_IMM << 5)) 38 #define BRK64_OPCODE_KPROBES_SS (AARCH64_BREAK_MON | (KPROBES_BRK_SS_IMM << 5)) 39 /* uprobes BRK opcodes with ESR encoding */ 40 #define BRK64_OPCODE_UPROBES (AARCH64_BREAK_MON | (UPROBES_BRK_IMM << 5)) 41 42 /* AArch32 */ 43 #define DBG_ESR_EVT_BKPT 0x4 44 #define DBG_ESR_EVT_VECC 0x5 45 46 #define AARCH32_BREAK_ARM 0x07f001f0 47 #define AARCH32_BREAK_THUMB 0xde01 48 #define AARCH32_BREAK_THUMB2_LO 0xf7f0 49 #define AARCH32_BREAK_THUMB2_HI 0xa000 50 51 #ifndef __ASSEMBLY__ 52 struct task_struct; 53 54 #define DBG_ARCH_ID_RESERVED 0 /* In case of ptrace ABI updates. */ 55 56 #define DBG_HOOK_HANDLED 0 57 #define DBG_HOOK_ERROR 1 58 59 u8 debug_monitors_arch(void); 60 61 enum dbg_active_el { 62 DBG_ACTIVE_EL0 = 0, 63 DBG_ACTIVE_EL1, 64 }; 65 66 void enable_debug_monitors(enum dbg_active_el el); 67 void disable_debug_monitors(enum dbg_active_el el); 68 69 void user_rewind_single_step(struct task_struct *task); 70 void user_fastforward_single_step(struct task_struct *task); 71 void user_regs_reset_single_step(struct user_pt_regs *regs, 72 struct task_struct *task); 73 74 void kernel_enable_single_step(struct pt_regs *regs); 75 void kernel_disable_single_step(void); 76 int kernel_active_single_step(void); 77 void kernel_rewind_single_step(struct pt_regs *regs); 78 void kernel_fastforward_single_step(struct pt_regs *regs); 79 80 #ifdef CONFIG_HAVE_HW_BREAKPOINT 81 bool try_step_suspended_breakpoints(struct pt_regs *regs); 82 #else try_step_suspended_breakpoints(struct pt_regs * regs)83static inline bool try_step_suspended_breakpoints(struct pt_regs *regs) 84 { 85 return false; 86 } 87 #endif 88 89 bool try_handle_aarch32_break(struct pt_regs *regs); 90 91 #endif /* __ASSEMBLY */ 92 #endif /* __ASM_DEBUG_MONITORS_H */ 93