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 u8 debug_monitors_arch(void); 66 67 void enable_debug_monitors(enum debug_el el); 68 void disable_debug_monitors(enum debug_el el); 69 70 void user_rewind_single_step(struct task_struct *task); 71 void user_fastforward_single_step(struct task_struct *task); 72 73 void kernel_enable_single_step(struct pt_regs *regs); 74 void kernel_disable_single_step(void); 75 int kernel_active_single_step(void); 76 77 #ifdef CONFIG_HAVE_HW_BREAKPOINT 78 int reinstall_suspended_bps(struct pt_regs *regs); 79 #else 80 static inline int reinstall_suspended_bps(struct pt_regs *regs) 81 { 82 return -ENODEV; 83 } 84 #endif 85 86 #endif /* __ASSEMBLY */ 87 #endif /* __KERNEL__ */ 88 #endif /* __ASM_DEBUG_MONITORS_H */ 89