1 files changed, 19 insertions, 5 deletions

diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index 24095601359..f05e66b0f86 100644
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -16,7 +16,6 @@
 #include <linux/signal.h>
 #include <linux/spinlock.h>
 #include <linux/personality.h>
-#include <linux/ptrace.h>
 #include <linux/kallsyms.h>
 #include <linux/delay.h>
 #include <linux/init.h>
@@ -45,7 +44,18 @@ static int __init user_debug_setup(char *str)
 __setup("user_debug=", user_debug_setup);
 #endif
 
-void dump_backtrace_entry(unsigned long where, unsigned long from)
+static void dump_mem(const char *str, unsigned long bottom, unsigned long top);
+
+static inline int in_exception_text(unsigned long ptr)
+{
+        extern char __exception_text_start[];
+        extern char __exception_text_end[];
+
+        return ptr >= (unsigned long)&__exception_text_start &&
+               ptr < (unsigned long)&__exception_text_end;
+}
+
+void dump_backtrace_entry(unsigned long where, unsigned long from, unsigned long frame)
 {
 #ifdef CONFIG_KALLSYMS
         printk("[<%08lx>] ", where);
@@ -55,6 +65,9 @@ void dump_backtrace_entry(unsigned long where, unsigned long from)
 #else
         printk("Function entered at [<%08lx>] from [<%08lx>]\n", where, from);
 #endif
+
+        if (in_exception_text(where))
+                dump_mem("Exception stack", frame + 4, frame + 4 + sizeof(struct pt_regs));
 }
 
 /*
@@ -266,13 +279,14 @@ void unregister_undef_hook(struct undef_hook *hook)
         spin_unlock_irqrestore(&undef_lock, flags);
 }
 
-asmlinkage void do_undefinstr(struct pt_regs *regs)
+asmlinkage void __exception do_undefinstr(struct pt_regs *regs)
 {
         unsigned int correction = thumb_mode(regs) ? 2 : 4;
         unsigned int instr;
         struct undef_hook *hook;
         siginfo_t info;
         void __user *pc;
+        unsigned long flags;
 
         /*
          * According to the ARM ARM, PC is 2 or 4 bytes ahead,
@@ -291,7 +305,7 @@ asmlinkage void do_undefinstr(struct pt_regs *regs)
                 get_user(instr, (u32 __user *)pc);
         }
 
-        spin_lock_irq(&undef_lock);
+        spin_lock_irqsave(&undef_lock, flags);
         list_for_each_entry(hook, &undef_hook, node) {
                 if ((instr & hook->instr_mask) == hook->instr_val &&
                     (regs->ARM_cpsr & hook->cpsr_mask) == hook->cpsr_val) {
@@ -301,7 +315,7 @@ asmlinkage void do_undefinstr(struct pt_regs *regs)
                         }
                 }
         }
-        spin_unlock_irq(&undef_lock);
+        spin_unlock_irqrestore(&undef_lock, flags);
 
 #ifdef CONFIG_DEBUG_USER
         if (user_debug & UDBG_UNDEFINED) {