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Diffstat (limited to 'arch/i386/kernel/traps.c')
-rw-r--r--arch/i386/kernel/traps.c70
1 files changed, 60 insertions, 10 deletions
diff --git a/arch/i386/kernel/traps.c b/arch/i386/kernel/traps.c
index dcc14477af1..78464097470 100644
--- a/arch/i386/kernel/traps.c
+++ b/arch/i386/kernel/traps.c
@@ -28,6 +28,7 @@
#include <linux/utsname.h>
#include <linux/kprobes.h>
#include <linux/kexec.h>
+#include <linux/unwind.h>
#ifdef CONFIG_EISA
#include <linux/ioport.h>
@@ -47,7 +48,7 @@
#include <asm/desc.h>
#include <asm/i387.h>
#include <asm/nmi.h>
-
+#include <asm/unwind.h>
#include <asm/smp.h>
#include <asm/arch_hooks.h>
#include <asm/kdebug.h>
@@ -92,6 +93,7 @@ asmlinkage void spurious_interrupt_bug(void);
asmlinkage void machine_check(void);
static int kstack_depth_to_print = 24;
+static int call_trace = 1;
ATOMIC_NOTIFIER_HEAD(i386die_chain);
int register_die_notifier(struct notifier_block *nb)
@@ -170,7 +172,23 @@ static inline unsigned long print_context_stack(struct thread_info *tinfo,
return ebp;
}
-static void show_trace_log_lvl(struct task_struct *task,
+static asmlinkage int show_trace_unwind(struct unwind_frame_info *info, void *log_lvl)
+{
+ int n = 0;
+ int printed = 0; /* nr of entries already printed on current line */
+
+ while (unwind(info) == 0 && UNW_PC(info)) {
+ ++n;
+ printed = print_addr_and_symbol(UNW_PC(info), log_lvl, printed);
+ if (arch_unw_user_mode(info))
+ break;
+ }
+ if (printed)
+ printk("\n");
+ return n;
+}
+
+static void show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
unsigned long *stack, char *log_lvl)
{
unsigned long ebp;
@@ -178,6 +196,26 @@ static void show_trace_log_lvl(struct task_struct *task,
if (!task)
task = current;
+ if (call_trace >= 0) {
+ int unw_ret = 0;
+ struct unwind_frame_info info;
+
+ if (regs) {
+ if (unwind_init_frame_info(&info, task, regs) == 0)
+ unw_ret = show_trace_unwind(&info, log_lvl);
+ } else if (task == current)
+ unw_ret = unwind_init_running(&info, show_trace_unwind, log_lvl);
+ else {
+ if (unwind_init_blocked(&info, task) == 0)
+ unw_ret = show_trace_unwind(&info, log_lvl);
+ }
+ if (unw_ret > 0) {
+ if (call_trace > 0)
+ return;
+ printk("%sLegacy call trace:\n", log_lvl);
+ }
+ }
+
if (task == current) {
/* Grab ebp right from our regs */
asm ("movl %%ebp, %0" : "=r" (ebp) : );
@@ -198,13 +236,13 @@ static void show_trace_log_lvl(struct task_struct *task,
}
}
-void show_trace(struct task_struct *task, unsigned long * stack)
+void show_trace(struct task_struct *task, struct pt_regs *regs, unsigned long * stack)
{
- show_trace_log_lvl(task, stack, "");
+ show_trace_log_lvl(task, regs, stack, "");
}
-static void show_stack_log_lvl(struct task_struct *task, unsigned long *esp,
- char *log_lvl)
+static void show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs,
+ unsigned long *esp, char *log_lvl)
{
unsigned long *stack;
int i;
@@ -225,13 +263,13 @@ static void show_stack_log_lvl(struct task_struct *task, unsigned long *esp,
printk("%08lx ", *stack++);
}
printk("\n%sCall Trace:\n", log_lvl);
- show_trace_log_lvl(task, esp, log_lvl);
+ show_trace_log_lvl(task, regs, esp, log_lvl);
}
void show_stack(struct task_struct *task, unsigned long *esp)
{
printk(" ");
- show_stack_log_lvl(task, esp, "");
+ show_stack_log_lvl(task, NULL, esp, "");
}
/*
@@ -241,7 +279,7 @@ void dump_stack(void)
{
unsigned long stack;
- show_trace(current, &stack);
+ show_trace(current, NULL, &stack);
}
EXPORT_SYMBOL(dump_stack);
@@ -285,7 +323,7 @@ void show_registers(struct pt_regs *regs)
u8 __user *eip;
printk("\n" KERN_EMERG "Stack: ");
- show_stack_log_lvl(NULL, (unsigned long *)esp, KERN_EMERG);
+ show_stack_log_lvl(NULL, regs, (unsigned long *)esp, KERN_EMERG);
printk(KERN_EMERG "Code: ");
@@ -1215,3 +1253,15 @@ static int __init kstack_setup(char *s)
return 1;
}
__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);