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-rw-r--r--kernel/arch/arm64/include/asm/debug-monitors.h158
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 */