*
* 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 $
*/
/*
* 'Traps.c' handles hardware traps and faults after we have saved some
* state in 'entry.S'.
*/
-#include <linux/config.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/nmi.h>
#include <linux/kprobes.h>
#include <linux/kexec.h>
+#include <linux/unwind.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#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>
asmlinkage void spurious_interrupt_bug(void);
ATOMIC_NOTIFIER_HEAD(die_chain);
+EXPORT_SYMBOL(die_chain);
int register_die_notifier(struct notifier_block *nb)
{
{
if (regs->eflags & X86_EFLAGS_IF)
local_irq_disable();
+ /* Make sure to not schedule here because we could be running
+ on an exception stack. */
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>
-int printk_address(unsigned long address)
-{
+# include <linux/kallsyms.h>
+void printk_address(unsigned long address)
+{
unsigned long offset = 0, symsize;
const char *symname;
char *modname;
- char *delim = ":";
+ char *delim = ":";
char namebuf[128];
- symname = kallsyms_lookup(address, &symsize, &offset, &modname, namebuf);
- if (!symname)
- return printk("[<%016lx>]", address);
- if (!modname)
+ symname = kallsyms_lookup(address, &symsize, &offset,
+ &modname, namebuf);
+ if (!symname) {
+ printk(" [<%016lx>]\n", address);
+ return;
+ }
+ if (!modname)
modname = delim = "";
- return printk("<%016lx>{%s%s%s%s%+ld}",
- address, delim, modname, delim, symname, offset);
-}
+ printk(" [<%016lx>] %s%s%s%s+0x%lx/0x%lx\n",
+ address, delim, modname, delim, symname, offset, symsize);
+}
#else
-int printk_address(unsigned long address)
-{
- return printk("[<%016lx>]", address);
-}
+void printk_address(unsigned long address)
+{
+ printk(" [<%016lx>]\n", address);
+}
#endif
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 n = 0;
+
+ while (unwind(info) == 0 && UNW_PC(info)) {
+ n++;
+ printk_address(UNW_PC(info));
+ if (arch_unw_user_mode(info))
+ break;
+ }
+ return n;
+}
+
/*
* x86-64 can have upto three kernel stacks:
* process 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:");
+ printk("\nCall Trace:\n");
+
+ 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++; \
if (kernel_text_address(addr)) { \
- if (i > 50) { \
- printk("\n "); \
- i = 0; \
- } \
- else \
- i += printk(" "); \
/* \
* If the address is either in the text segment of the \
* kernel, or in the region which contains vmalloc'ed \
* down the cause of the crash will be able to figure \
* out the call path that was taken. \
*/ \
- i += printk_address(addr); \
+ printk_address(addr); \
} \
} while (0)
- for(i = 11; ; ) {
+ for( ; ; ) {
const char *id;
unsigned long *estack_end;
estack_end = in_exception_stack(cpu, (unsigned long)stack,
&used, &id);
if (estack_end) {
- i += printk(" <%s>", id);
+ printk(" <%s>", id);
HANDLE_STACK (stack < estack_end);
- i += printk(" <EOE>");
+ printk(" <EOE>");
stack = (unsigned long *) estack_end[-2];
continue;
}
(IRQSTACKSIZE - 64) / sizeof(*irqstack);
if (stack >= irqstack && stack < irqstack_end) {
- i += printk(" <IRQ>");
+ printk(" <IRQ>");
HANDLE_STACK (stack < irqstack_end);
stack = (unsigned long *) (irqstack_end[-1]);
irqstack_end = NULL;
- i += printk(" <EOI>");
+ printk(" <EOI>");
continue;
}
}
HANDLE_STACK (((long) stack & (THREAD_SIZE-1)) != 0);
#undef HANDLE_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;
break;
}
if (i && ((i % 4) == 0))
- printk("\n ");
- printk("%016lx ", *stack++);
+ printk("\n");
+ 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);
}
/*
void dump_stack(void)
{
unsigned long dummy;
- show_trace(&dummy);
+ show_trace(NULL, NULL, &dummy);
}
EXPORT_SYMBOL(dump_stack);
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)
{
BUG();
}
+EXPORT_SYMBOL(out_of_line_bug);
#endif
static DEFINE_SPINLOCK(die_lock);
static int die_owner = -1;
+static unsigned int die_nest_count;
unsigned __kprobes long oops_begin(void)
{
else
spin_lock(&die_lock);
}
+ die_nest_count++;
die_owner = cpu;
console_verbose();
bust_spinlocks(1);
{
die_owner = -1;
bust_spinlocks(0);
- spin_unlock_irqrestore(&die_lock, flags);
+ die_nest_count--;
+ if (die_nest_count)
+ /* We still own the lock */
+ local_irq_restore(flags);
+ else
+ /* Nest count reaches zero, release the lock. */
+ spin_unlock_irqrestore(&die_lock, flags);
if (panic_on_oops)
panic("Oops");
}
panic("nmi watchdog");
printk("console shuts up ...\n");
oops_end(flags);
+ nmi_exit();
+ local_irq_enable();
do_exit(SIGSEGV);
}
{
struct task_struct *tsk = current;
- conditional_sti(regs);
-
tsk->thread.error_code = error_code;
tsk->thread.trap_no = trapnr;
if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \
== NOTIFY_STOP) \
return; \
+ conditional_sti(regs); \
do_trap(trapnr, signr, str, regs, error_code, NULL); \
}
if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \
== NOTIFY_STOP) \
return; \
+ conditional_sti(regs); \
do_trap(trapnr, signr, str, regs, error_code, &info); \
}
DO_ERROR(11, SIGBUS, "segment not present", segment_not_present)
DO_ERROR_INFO(17, SIGBUS, "alignment check", alignment_check, BUS_ADRALN, 0)
DO_ERROR(18, SIGSEGV, "reserved", reserved)
-DO_ERROR(12, SIGBUS, "stack segment", stack_segment)
+
+/* Runs on IST stack */
+asmlinkage void do_stack_segment(struct pt_regs *regs, long error_code)
+{
+ if (notify_die(DIE_TRAP, "stack segment", regs, error_code,
+ 12, SIGBUS) == NOTIFY_STOP)
+ return;
+ preempt_conditional_sti(regs);
+ do_trap(12, SIGBUS, "stack segment", regs, error_code, NULL);
+ preempt_conditional_cli(regs);
+}
asmlinkage void do_double_fault(struct pt_regs * regs, long error_code)
{
if (notify_die(DIE_INT3, "int3", regs, error_code, 3, SIGTRAP) == NOTIFY_STOP) {
return;
}
+ preempt_conditional_sti(regs);
do_trap(3, SIGTRAP, "int3", regs, error_code, NULL);
- return;
+ preempt_conditional_cli(regs);
}
/* Help handler running on IST stack to switch back to user stack
}
__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);
projects / linux-2.6 / blobdiff