1 files changed, 72 insertions, 11 deletions

diff --git a/arch/x86_64/kernel/traps.c b/arch/x86_64/kernel/traps.c
index cea335e8746c..3d11a2fe45b7 100644
--- a/arch/x86_64/kernel/traps.c
+++ b/arch/x86_64/kernel/traps.c
@@ -6,8 +6,6 @@
  *
  *  Pentium III FXSR, SSE support
  *      Gareth Hughes <gareth@valinux.com>, May 2000
- *
- *  $Id: traps.c,v 1.36 2002/03/24 11:09:10 ak Exp $
  */
 
 /*
@@ -31,6 +29,7 @@
 #include <linux/nmi.h>
 #include <linux/kprobes.h>
 #include <linux/kexec.h>
+#include <linux/unwind.h>
 
 #include <asm/system.h>
 #include <asm/uaccess.h>
@@ -41,7 +40,7 @@
 #include <asm/i387.h>
 #include <asm/kdebug.h>
 #include <asm/processor.h>
-
+#include <asm/unwind.h>
 #include <asm/smp.h>
 #include <asm/pgalloc.h>
 #include <asm/pda.h>
@@ -71,6 +70,7 @@ asmlinkage void machine_check(void);
 asmlinkage void spurious_interrupt_bug(void);
 
 ATOMIC_NOTIFIER_HEAD(die_chain);
+EXPORT_SYMBOL(die_chain);
 
 int register_die_notifier(struct notifier_block *nb)
 {
@@ -107,7 +107,8 @@ static inline void preempt_conditional_cli(struct pt_regs *regs)
         preempt_enable_no_resched();
 }
 
-static int kstack_depth_to_print = 10;
+static int kstack_depth_to_print = 12;
+static int call_trace = 1;
 
 #ifdef CONFIG_KALLSYMS
 #include <linux/kallsyms.h> 
@@ -191,6 +192,25 @@ static unsigned long *in_exception_stack(unsigned cpu, unsigned long stack,
         return NULL;
 }
 
+static int show_trace_unwind(struct unwind_frame_info *info, void *context)
+{
+        int i = 11, n = 0;
+
+        while (unwind(info) == 0 && UNW_PC(info)) {
+                ++n;
+                if (i > 50) {
+                        printk("\n       ");
+                        i = 7;
+                } else
+                        i += printk(" ");
+                i += printk_address(UNW_PC(info));
+                if (arch_unw_user_mode(info))
+                        break;
+        }
+        printk("\n");
+        return n;
+}
+
 /*
  * x86-64 can have upto three kernel stacks: 
  * process stack
@@ -198,15 +218,39 @@ static unsigned long *in_exception_stack(unsigned cpu, unsigned long stack,
  * severe exception (double fault, nmi, stack fault, debug, mce) hardware stack
  */
 
-void show_trace(unsigned long *stack)
+void show_trace(struct task_struct *tsk, struct pt_regs *regs, unsigned long * stack)
 {
         const unsigned cpu = safe_smp_processor_id();
         unsigned long *irqstack_end = (unsigned long *)cpu_pda(cpu)->irqstackptr;
-        int i;
+        int i = 11;
         unsigned used = 0;
 
         printk("\nCall Trace:");
 
+        if (!tsk)
+                tsk = current;
+
+        if (call_trace >= 0) {
+                int unw_ret = 0;
+                struct unwind_frame_info info;
+
+                if (regs) {
+                        if (unwind_init_frame_info(&info, tsk, regs) == 0)
+                                unw_ret = show_trace_unwind(&info, NULL);
+                } else if (tsk == current)
+                        unw_ret = unwind_init_running(&info, show_trace_unwind, NULL);
+                else {
+                        if (unwind_init_blocked(&info, tsk) == 0)
+                                unw_ret = show_trace_unwind(&info, NULL);
+                }
+                if (unw_ret > 0) {
+                        if (call_trace > 0)
+                                return;
+                        printk("Legacy call trace:");
+                        i = 18;
+                }
+        }
+
 #define HANDLE_STACK(cond) \
         do while (cond) { \
                 unsigned long addr = *stack++; \
@@ -229,7 +273,7 @@ void show_trace(unsigned long *stack)
                 } \
         } while (0)
 
-        for(i = 11; ; ) {
+        for(; ; ) {
                 const char *id;
                 unsigned long *estack_end;
                 estack_end = in_exception_stack(cpu, (unsigned long)stack,
@@ -264,7 +308,7 @@ void show_trace(unsigned long *stack)
         printk("\n");
 }
 
-void show_stack(struct task_struct *tsk, unsigned long * rsp)
+static void _show_stack(struct task_struct *tsk, struct pt_regs *regs, unsigned long * rsp)
 {
         unsigned long *stack;
         int i;
@@ -298,7 +342,12 @@ void show_stack(struct task_struct *tsk, unsigned long * rsp)
                 printk("%016lx ", *stack++);
                 touch_nmi_watchdog();
         }
-        show_trace((unsigned long *)rsp);
+        show_trace(tsk, regs, rsp);
+}
+
+void show_stack(struct task_struct *tsk, unsigned long * rsp)
+{
+        _show_stack(tsk, NULL, rsp);
 }
 
 /*
@@ -307,7 +356,7 @@ void show_stack(struct task_struct *tsk, unsigned long * rsp)
 void dump_stack(void)
 {
         unsigned long dummy;
-        show_trace(&dummy);
+        show_trace(NULL, NULL, &dummy);
 }
 
 EXPORT_SYMBOL(dump_stack);
@@ -334,7 +383,7 @@ void show_registers(struct pt_regs *regs)
         if (in_kernel) {
 
                 printk("Stack: ");
-                show_stack(NULL, (unsigned long*)rsp);
+                _show_stack(NULL, regs, (unsigned long*)rsp);
 
                 printk("\nCode: ");
                 if (regs->rip < PAGE_OFFSET)
@@ -383,6 +432,7 @@ void out_of_line_bug(void)
 { 
         BUG(); 
 } 
+EXPORT_SYMBOL(out_of_line_bug);
 #endif
 
 static DEFINE_SPINLOCK(die_lock);
@@ -1012,3 +1062,14 @@ static int __init kstack_setup(char *s)
 }
 __setup("kstack=", kstack_setup);
 
+static int __init call_trace_setup(char *s)
+{
+        if (strcmp(s, "old") == 0)
+                call_trace = -1;
+        else if (strcmp(s, "both") == 0)
+                call_trace = 0;
+        else if (strcmp(s, "new") == 0)
+                call_trace = 1;
+        return 1;
+}
+__setup("call_trace=", call_trace_setup);