diff options
Diffstat (limited to 'kernel/arch/arm64/include/asm/debug-monitors.h')
| -rw-r--r-- | kernel/arch/arm64/include/asm/debug-monitors.h | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/kernel/arch/arm64/include/asm/debug-monitors.h b/kernel/arch/arm64/include/asm/debug-monitors.h new file mode 100644 index 000000000..40ec68aa6 --- /dev/null +++ b/kernel/arch/arm64/include/asm/debug-monitors.h @@ -0,0 +1,158 @@ +/* + * Copyright (C) 2012 ARM Ltd. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ +#ifndef __ASM_DEBUG_MONITORS_H +#define __ASM_DEBUG_MONITORS_H + +#ifdef __KERNEL__ + +/* Low-level stepping controls. */ +#define DBG_MDSCR_SS (1 << 0) +#define DBG_SPSR_SS (1 << 21) + +/* MDSCR_EL1 enabling bits */ +#define DBG_MDSCR_KDE (1 << 13) +#define DBG_MDSCR_MDE (1 << 15) +#define DBG_MDSCR_MASK ~(DBG_MDSCR_KDE | DBG_MDSCR_MDE) + +#define DBG_ESR_EVT(x) (((x) >> 27) & 0x7) + +/* AArch64 */ +#define DBG_ESR_EVT_HWBP 0x0 +#define DBG_ESR_EVT_HWSS 0x1 +#define DBG_ESR_EVT_HWWP 0x2 +#define DBG_ESR_EVT_BRK 0x6 + +/* + * Break point instruction encoding + */ +#define BREAK_INSTR_SIZE 4 + +/* + * ESR values expected for dynamic and compile time BRK instruction + */ +#define DBG_ESR_VAL_BRK(x) (0xf2000000 | ((x) & 0xfffff)) + +/* + * #imm16 values used for BRK instruction generation + * Allowed values for kgbd are 0x400 - 0x7ff + * 0x100: for triggering a fault on purpose (reserved) + * 0x400: for dynamic BRK instruction + * 0x401: for compile time BRK instruction + */ +#define FAULT_BRK_IMM 0x100 +#define KGDB_DYN_DBG_BRK_IMM 0x400 +#define KGDB_COMPILED_DBG_BRK_IMM 0x401 + +/* + * BRK instruction encoding + * The #imm16 value should be placed at bits[20:5] within BRK ins + */ +#define AARCH64_BREAK_MON 0xd4200000 + +/* + * BRK instruction for provoking a fault on purpose + * Unlike kgdb, #imm16 value with unallocated handler is used for faulting. + */ +#define AARCH64_BREAK_FAULT (AARCH64_BREAK_MON | (FAULT_BRK_IMM << 5)) + +/* + * Extract byte from BRK instruction + */ +#define KGDB_DYN_DBG_BRK_INS_BYTE(x) \ + ((((AARCH64_BREAK_MON) & 0xffe0001f) >> (x * 8)) & 0xff) + +/* + * Extract byte from BRK #imm16 + */ +#define KGBD_DYN_DBG_BRK_IMM_BYTE(x) \ + (((((KGDB_DYN_DBG_BRK_IMM) & 0xffff) << 5) >> (x * 8)) & 0xff) + +#define KGDB_DYN_DBG_BRK_BYTE(x) \ + (KGDB_DYN_DBG_BRK_INS_BYTE(x) | KGBD_DYN_DBG_BRK_IMM_BYTE(x)) + +#define KGDB_DYN_BRK_INS_BYTE0 KGDB_DYN_DBG_BRK_BYTE(0) +#define KGDB_DYN_BRK_INS_BYTE1 KGDB_DYN_DBG_BRK_BYTE(1) +#define KGDB_DYN_BRK_INS_BYTE2 KGDB_DYN_DBG_BRK_BYTE(2) +#define KGDB_DYN_BRK_INS_BYTE3 KGDB_DYN_DBG_BRK_BYTE(3) + +#define CACHE_FLUSH_IS_SAFE 1 + +/* AArch32 */ +#define DBG_ESR_EVT_BKPT 0x4 +#define DBG_ESR_EVT_VECC 0x5 + +#define AARCH32_BREAK_ARM 0x07f001f0 +#define AARCH32_BREAK_THUMB 0xde01 +#define AARCH32_BREAK_THUMB2_LO 0xf7f0 +#define AARCH32_BREAK_THUMB2_HI 0xa000 + +#ifndef __ASSEMBLY__ +struct task_struct; + +#define DBG_ARCH_ID_RESERVED 0 /* In case of ptrace ABI updates. */ + +#define DBG_HOOK_HANDLED 0 +#define DBG_HOOK_ERROR 1 + +struct step_hook { + struct list_head node; + int (*fn)(struct pt_regs *regs, unsigned int esr); +}; + +void register_step_hook(struct step_hook *hook); +void unregister_step_hook(struct step_hook *hook); + +struct break_hook { + struct list_head node; + u32 esr_val; + u32 esr_mask; + int (*fn)(struct pt_regs *regs, unsigned int esr); +}; + +void register_break_hook(struct break_hook *hook); +void unregister_break_hook(struct break_hook *hook); + +u8 debug_monitors_arch(void); + +enum debug_el { + DBG_ACTIVE_EL0 = 0, + DBG_ACTIVE_EL1, +}; + +void enable_debug_monitors(enum debug_el el); +void disable_debug_monitors(enum debug_el el); + +void user_rewind_single_step(struct task_struct *task); +void user_fastforward_single_step(struct task_struct *task); + +void kernel_enable_single_step(struct pt_regs *regs); +void kernel_disable_single_step(void); +int kernel_active_single_step(void); + +#ifdef CONFIG_HAVE_HW_BREAKPOINT +int reinstall_suspended_bps(struct pt_regs *regs); +#else +static inline int reinstall_suspended_bps(struct pt_regs *regs) +{ + return -ENODEV; +} +#endif + +int aarch32_break_handler(struct pt_regs *regs); + +#endif /* __ASSEMBLY */ +#endif /* __KERNEL__ */ +#endif /* __ASM_DEBUG_MONITORS_H */ |