7 files changed, 70 insertions, 9 deletions

diff --git a/arch/sh/include/asm/Kbuild b/arch/sh/include/asm/Kbuild
index e121c30f797d..46cb93477bcb 100644
--- a/arch/sh/include/asm/Kbuild
+++ b/arch/sh/include/asm/Kbuild
@@ -1,6 +1,8 @@
 include include/asm-generic/Kbuild.asm
 
-header-y += cachectl.h cpu-features.h
+header-y += cachectl.h
+header-y += cpu-features.h
+header-y += hw_breakpoint.h
 
 unifdef-y += unistd_32.h
 unifdef-y += unistd_64.h
diff --git a/arch/sh/include/asm/hw_breakpoint.h b/arch/sh/include/asm/hw_breakpoint.h
new file mode 100644
index 000000000000..0f4a00f60058
--- /dev/null
+++ b/arch/sh/include/asm/hw_breakpoint.h
@@ -0,0 +1,53 @@
+#ifndef __ASM_SH_HW_BREAKPOINT_H
+#define __ASM_SH_HW_BREAKPOINT_H
+
+#include <linux/kdebug.h>
+#include <linux/types.h>
+#include <asm/ubc.h>
+
+#ifdef __KERNEL__
+#define __ARCH_HW_BREAKPOINT_H
+
+struct arch_hw_breakpoint {
+        char            *name; /* Contains name of the symbol to set bkpt */
+        unsigned long   address;
+        unsigned long   asid;
+        u16             len;
+        u16             type;
+};
+
+enum {
+        SH_BREAKPOINT_READ      = (1 << 1),
+        SH_BREAKPOINT_WRITE     = (1 << 2),
+        SH_BREAKPOINT_RW        = SH_BREAKPOINT_READ | SH_BREAKPOINT_WRITE,
+
+        SH_BREAKPOINT_LEN_1     = (1 << 12),
+        SH_BREAKPOINT_LEN_2     = (1 << 13),
+        SH_BREAKPOINT_LEN_4     = SH_BREAKPOINT_LEN_1 | SH_BREAKPOINT_LEN_2,
+        SH_BREAKPOINT_LEN_8     = (1 << 14),
+};
+
+/* Total number of available UBC channels */
+#define HBP_NUM         1 /* XXX */
+
+struct perf_event;
+struct task_struct;
+struct pmu;
+
+extern int arch_check_va_in_userspace(unsigned long va, u16 hbp_len);
+extern int arch_validate_hwbkpt_settings(struct perf_event *bp,
+                                         struct task_struct *tsk);
+extern int hw_breakpoint_exceptions_notify(struct notifier_block *unused,
+                                           unsigned long val, void *data);
+
+int arch_install_hw_breakpoint(struct perf_event *bp);
+void arch_uninstall_hw_breakpoint(struct perf_event *bp);
+void hw_breakpoint_pmu_read(struct perf_event *bp);
+void hw_breakpoint_pmu_unthrottle(struct perf_event *bp);
+
+extern void arch_fill_perf_breakpoint(struct perf_event *bp);
+
+extern struct pmu perf_ops_bp;
+
+#endif /* __KERNEL__ */
+#endif /* __ASM_SH_HW_BREAKPOINT_H */
diff --git a/arch/sh/include/asm/kdebug.h b/arch/sh/include/asm/kdebug.h
index 985219f9759e..5f6d2e9ccb7c 100644
--- a/arch/sh/include/asm/kdebug.h
+++ b/arch/sh/include/asm/kdebug.h
@@ -6,6 +6,8 @@ enum die_val {
         DIE_TRAP,
         DIE_NMI,
         DIE_OOPS,
+        DIE_BREAKPOINT,
+        DIE_SSTEP,
 };
 
 #endif /* __ASM_SH_KDEBUG_H */
diff --git a/arch/sh/include/asm/processor_32.h b/arch/sh/include/asm/processor_32.h
index 9a8714945dc9..f4b54040dbc3 100644
--- a/arch/sh/include/asm/processor_32.h
+++ b/arch/sh/include/asm/processor_32.h
@@ -14,6 +14,7 @@
 #include <asm/page.h>
 #include <asm/types.h>
 #include <asm/ptrace.h>
+#include <asm/ubc.h>
 
 /*
  * Default implementation of macro that returns current
@@ -99,8 +100,8 @@ struct thread_struct {
         unsigned long sp;
         unsigned long pc;
 
-        /* Hardware debugging registers */
-        unsigned long ubc_pc;
+        /* Save middle states of ptrace breakpoints */
+        struct perf_event       *ptrace_bps[NR_UBC_CHANNELS];
 
         /* floating point info */
         union sh_fpu_union fpu;
@@ -111,9 +112,6 @@ struct thread_struct {
 #endif
 };
 
-/* Count of active tasks with UBC settings */
-extern int ubc_usercnt;
-
 #define INIT_THREAD  {                                          \
         .sp = sizeof(init_stack) + (long) &init_stack,          \
 }
diff --git a/arch/sh/include/asm/system.h b/arch/sh/include/asm/system.h
index b5c5acdc8c0e..1014da8b3ed3 100644
--- a/arch/sh/include/asm/system.h
+++ b/arch/sh/include/asm/system.h
@@ -144,8 +144,6 @@ void per_cpu_trap_init(void);
 void default_idle(void);
 void cpu_idle_wait(void);
 
-asmlinkage void break_point_trap(void);
-
 #ifdef CONFIG_SUPERH32
 #define BUILD_TRAP_HANDLER(name)                                        \
 asmlinkage void name##_trap_handler(unsigned long r4, unsigned long r5, \
diff --git a/arch/sh/include/asm/thread_info.h b/arch/sh/include/asm/thread_info.h
index bdeb9d46d17d..8ab9145bf50b 100644
--- a/arch/sh/include/asm/thread_info.h
+++ b/arch/sh/include/asm/thread_info.h
@@ -117,6 +117,7 @@ extern void free_thread_info(struct thread_info *ti);
 #define TIF_SECCOMP             6       /* secure computing */
 #define TIF_NOTIFY_RESUME       7       /* callback before returning to user */
 #define TIF_SYSCALL_TRACEPOINT  8       /* for ftrace syscall instrumentation */
+#define TIF_DEBUG               9       /* uses UBC */
 #define TIF_USEDFPU             16      /* FPU was used by this task this quantum (SMP) */
 #define TIF_POLLING_NRFLAG      17      /* true if poll_idle() is polling TIF_NEED_RESCHED */
 #define TIF_MEMDIE              18
@@ -131,6 +132,7 @@ extern void free_thread_info(struct thread_info *ti);
 #define _TIF_SECCOMP            (1 << TIF_SECCOMP)
 #define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
 #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
+#define _TIF_DEBUG              (1 << TIF_DEBUG)
 #define _TIF_USEDFPU            (1 << TIF_USEDFPU)
 #define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
 #define _TIF_FREEZE             (1 << TIF_FREEZE)
diff --git a/arch/sh/include/asm/ubc.h b/arch/sh/include/asm/ubc.h
index 4ca4b7717371..dd7878197b6e 100644
--- a/arch/sh/include/asm/ubc.h
+++ b/arch/sh/include/asm/ubc.h
@@ -10,8 +10,8 @@
  */
 #ifndef __ASM_SH_UBC_H
 #define __ASM_SH_UBC_H
-#ifdef __KERNEL__
 
+#ifdef __KERNEL__
 #include <cpu/ubc.h>
 
 /* User Break Controller */
@@ -60,6 +60,12 @@
 #define BRCR_UBDE               (1 << 0)
 #endif
 
+/*
+ * All SH parts have 2 UBC channels. I defy any hardware designer to
+ * invalidate this assertion.
+ */
+#define NR_UBC_CHANNELS         2
+
 #ifndef __ASSEMBLY__
 /* arch/sh/kernel/cpu/ubc.S */
 extern void ubc_sleep(void);