arm64: Debugging support

This patch adds ptrace, debug monitors and hardware breakpoints support.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Acked-by: Nicolas Pitre <nico@linaro.org>
Acked-by: Olof Johansson <olof@lixom.net>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 88 insertions, 0 deletions

diff --git a/arch/arm64/include/asm/debug-monitors.h b/arch/arm64/include/asm/debug-monitors.h
new file mode 100644
index 000000000000..7eaa0b302493
--- /dev/null
+++ b/arch/arm64/include/asm/debug-monitors.h
@@ -0,0 +1,88 @@
+/*
+ * 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__
+
+#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
+
+enum debug_el {
+        DBG_ACTIVE_EL0 = 0,
+        DBG_ACTIVE_EL1,
+};
+
+/* 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 local_dbg_save(flags)                                                   \
+        do {                                                                    \
+                typecheck(unsigned long, flags);                                \
+                asm volatile(                                                   \
+                "mrs    %0, daif                        // local_dbg_save\n"    \
+                "msr    daifset, #8"                                            \
+                : "=r" (flags) : : "memory");                                   \
+        } while (0)
+
+#define local_dbg_restore(flags)                                                \
+        do {                                                                    \
+                typecheck(unsigned long, flags);                                \
+                asm volatile(                                                   \
+                "msr    daif, %0                        // local_dbg_restore\n" \
+                : : "r" (flags) : "memory");                                    \
+        } while (0)
+
+#define DBG_ARCH_ID_RESERVED    0       /* In case of ptrace ABI updates. */
+
+u8 debug_monitors_arch(void);
+
+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
+
+#endif  /* __ASSEMBLY */
+#endif  /* __KERNEL__ */
+#endif  /* __ASM_DEBUG_MONITORS_H */