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 #define DBG_ESR_EVT(x) (((x) >> 27) & 0x7) 22 23 /* AArch64 */ 24 #define DBG_ESR_EVT_HWBP 0x0 25 #define DBG_ESR_EVT_HWSS 0x1 26 #define DBG_ESR_EVT_HWWP 0x2 27 #define DBG_ESR_EVT_BRK 0x6 28 29 enum debug_el { 30 DBG_ACTIVE_EL0 = 0, 31 DBG_ACTIVE_EL1, 32 }; 33 34 /* AArch32 */ 35 #define DBG_ESR_EVT_BKPT 0x4 36 #define DBG_ESR_EVT_VECC 0x5 37 38 #define AARCH32_BREAK_ARM 0x07f001f0 39 #define AARCH32_BREAK_THUMB 0xde01 40 #define AARCH32_BREAK_THUMB2_LO 0xf7f0 41 #define AARCH32_BREAK_THUMB2_HI 0xa000 42 43 #ifndef __ASSEMBLY__ 44 struct task_struct; 45 46 #define local_dbg_save(flags) \ 47 do { \ 48 typecheck(unsigned long, flags); \ 49 asm volatile( \ 50 "mrs %0, daif // local_dbg_save\n" \ 51 "msr daifset, #8" \ 52 : "=r" (flags) : : "memory"); \ 53 } while (0) 54 55 #define local_dbg_restore(flags) \ 56 do { \ 57 typecheck(unsigned long, flags); \ 58 asm volatile( \ 59 "msr daif, %0 // local_dbg_restore\n" \ 60 : : "r" (flags) : "memory"); \ 61 } while (0) 62 63 #define DBG_ARCH_ID_RESERVED 0 /* In case of ptrace ABI updates. */ 64 65 #define DBG_HOOK_HANDLED 0 66 #define DBG_HOOK_ERROR 1 67 68 struct step_hook { 69 struct list_head node; 70 int (*fn)(struct pt_regs *regs, unsigned int esr); 71 }; 72 73 void register_step_hook(struct step_hook *hook); 74 void unregister_step_hook(struct step_hook *hook); 75 76 struct break_hook { 77 struct list_head node; 78 u32 esr_val; 79 u32 esr_mask; 80 int (*fn)(struct pt_regs *regs, unsigned int esr); 81 }; 82 83 void register_break_hook(struct break_hook *hook); 84 void unregister_break_hook(struct break_hook *hook); 85 86 u8 debug_monitors_arch(void); 87 88 void enable_debug_monitors(enum debug_el el); 89 void disable_debug_monitors(enum debug_el el); 90 91 void user_rewind_single_step(struct task_struct *task); 92 void user_fastforward_single_step(struct task_struct *task); 93 94 void kernel_enable_single_step(struct pt_regs *regs); 95 void kernel_disable_single_step(void); 96 int kernel_active_single_step(void); 97 98 #ifdef CONFIG_HAVE_HW_BREAKPOINT 99 int reinstall_suspended_bps(struct pt_regs *regs); 100 #else 101 static inline int reinstall_suspended_bps(struct pt_regs *regs) 102 { 103 return -ENODEV; 104 } 105 #endif 106 107 int aarch32_break_handler(struct pt_regs *regs); 108 109 #endif /* __ASSEMBLY */ 110 #endif /* __KERNEL__ */ 111 #endif /* __ASM_DEBUG_MONITORS_H */ 112