[Bluetooth] Add support for newer ANYCOM USB dongles

[pandora-kernel.git] / arch / sparc64 / kernel / kprobes.c

diff --git a/arch/sparc64/kernel/kprobes.c b/arch/sparc64/kernel/kprobes.c
index b9a9ce7..8e75ed7 100644 (file)
--- a/arch/sparc64/kernel/kprobes.c
+++ b/arch/sparc64/kernel/kprobes.c
@@ -3,12 +3,13 @@
  * Copyright (C) 2004 David S. Miller <davem@davemloft.net>
  */
 
-#include <linux/config.h>
 #include <linux/kernel.h>
 #include <linux/kprobes.h>
+#include <linux/module.h>
 #include <asm/kdebug.h>
 #include <asm/signal.h>
 #include <asm/cacheflush.h>
+#include <asm/uaccess.h>
 
 /* We do not have hardware single-stepping on sparc64.
  * So we implement software single-stepping with breakpoint
@@ -61,7 +62,7 @@ void __kprobes arch_disarm_kprobe(struct kprobe *p)
        flushi(p->addr);
 }
 
-static inline void save_previous_kprobe(struct kprobe_ctlblk *kcb)
+static void __kprobes save_previous_kprobe(struct kprobe_ctlblk *kcb)
 {
        kcb->prev_kprobe.kp = kprobe_running();
        kcb->prev_kprobe.status = kcb->kprobe_status;
@@ -69,7 +70,7 @@ static inline void save_previous_kprobe(struct kprobe_ctlblk *kcb)
        kcb->prev_kprobe.orig_tstate_pil = kcb->kprobe_orig_tstate_pil;
 }
 
-static inline void restore_previous_kprobe(struct kprobe_ctlblk *kcb)
+static void __kprobes restore_previous_kprobe(struct kprobe_ctlblk *kcb)
 {
        __get_cpu_var(current_kprobe) = kcb->prev_kprobe.kp;
        kcb->kprobe_status = kcb->prev_kprobe.status;
@@ -77,7 +78,7 @@ static inline void restore_previous_kprobe(struct kprobe_ctlblk *kcb)
        kcb->kprobe_orig_tstate_pil = kcb->prev_kprobe.orig_tstate_pil;
 }
 
-static inline void set_current_kprobe(struct kprobe *p, struct pt_regs *regs,
+static void __kprobes set_current_kprobe(struct kprobe *p, struct pt_regs *regs,
                                struct kprobe_ctlblk *kcb)
 {
        __get_cpu_var(current_kprobe) = p;
@@ -85,7 +86,7 @@ static inline void set_current_kprobe(struct kprobe *p, struct pt_regs *regs,
        kcb->kprobe_orig_tstate_pil = (regs->tstate & TSTATE_PIL);
 }
 
-static inline void prepare_singlestep(struct kprobe *p, struct pt_regs *regs,
+static void __kprobes prepare_singlestep(struct kprobe *p, struct pt_regs *regs,
                        struct kprobe_ctlblk *kcb)
 {
        regs->tstate |= TSTATE_PIL;
@@ -271,7 +272,7 @@ static void __kprobes resume_execution(struct kprobe *p,
                        kcb->kprobe_orig_tstate_pil);
 }
 
-static inline int post_kprobe_handler(struct pt_regs *regs)
+static int __kprobes post_kprobe_handler(struct pt_regs *regs)
 {
        struct kprobe *cur = kprobe_running();
        struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
@@ -298,20 +299,72 @@ out:
        return 1;
 }
 
-static inline int kprobe_fault_handler(struct pt_regs *regs, int trapnr)
+static int __kprobes kprobe_fault_handler(struct pt_regs *regs, int trapnr)
 {
        struct kprobe *cur = kprobe_running();
        struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
+       const struct exception_table_entry *entry;
+
+       switch(kcb->kprobe_status) {
+       case KPROBE_HIT_SS:
+       case KPROBE_REENTER:
+               /*
+                * We are here because the instruction being single
+                * stepped caused a page fault. We reset the current
+                * kprobe and the tpc points back to the probe address
+                * and allow the page fault handler to continue as a
+                * normal page fault.
+                */
+               regs->tpc = (unsigned long)cur->addr;
+               regs->tnpc = kcb->kprobe_orig_tnpc;
+               regs->tstate = ((regs->tstate & ~TSTATE_PIL) |
+                               kcb->kprobe_orig_tstate_pil);
+               if (kcb->kprobe_status == KPROBE_REENTER)
+                       restore_previous_kprobe(kcb);
+               else
+                       reset_current_kprobe();
+               preempt_enable_no_resched();
+               break;
+       case KPROBE_HIT_ACTIVE:
+       case KPROBE_HIT_SSDONE:
+               /*
+                * We increment the nmissed count for accounting,
+                * we can also use npre/npostfault count for accouting
+                * these specific fault cases.
+                */
+               kprobes_inc_nmissed_count(cur);
+
+               /*
+                * We come here because instructions in the pre/post
+                * handler caused the page_fault, this could happen
+                * if handler tries to access user space by
+                * copy_from_user(), get_user() etc. Let the
+                * user-specified handler try to fix it first.
+                */
+               if (cur->fault_handler && cur->fault_handler(cur, regs, trapnr))
+                       return 1;
 
-       if (cur->fault_handler && cur->fault_handler(cur, regs, trapnr))
-               return 1;
+               /*
+                * In case the user-specified fault handler returned
+                * zero, try to fix up.
+                */
 
-       if (kcb->kprobe_status & KPROBE_HIT_SS) {
-               resume_execution(cur, regs, kcb);
+               entry = search_exception_tables(regs->tpc);
+               if (entry) {
+                       regs->tpc = entry->fixup;
+                       regs->tnpc = regs->tpc + 4;
+                       return 1;
+               }
 
-               reset_current_kprobe();
-               preempt_enable_no_resched();
+               /*
+                * fixup_exception() could not handle it,
+                * Let do_page_fault() fix it.
+                */
+               break;
+       default:
+               break;
        }
+
        return 0;
 }
 
@@ -324,6 +377,9 @@ int __kprobes kprobe_exceptions_notify(struct notifier_block *self,
        struct die_args *args = (struct die_args *)data;
        int ret = NOTIFY_DONE;
 
+       if (args->regs && user_mode(args->regs))
+               return ret;
+
        switch (val) {
        case DIE_DEBUG:
                if (kprobe_handler(args->regs))