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Diffstat (limited to 'arch/x86_64/kernel/traps.c')
-rw-r--r--arch/x86_64/kernel/traps.c83
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);