#include <linux/kallsyms.h>
#include <linux/kprobes.h>
#include <linux/uaccess.h>
-#include <linux/utsname.h>
#include <linux/hardirq.h>
#include <linux/kdebug.h>
#include <linux/module.h>
#include <linux/ptrace.h>
#include <linux/kexec.h>
+#include <linux/sysfs.h>
#include <linux/bug.h>
#include <linux/nmi.h>
#include <asm/stacktrace.h>
-int panic_on_unrecovered_nmi;
-int kstack_depth_to_print = 12;
-static unsigned int code_bytes = 64;
-static int die_counter;
+#include "dumpstack.h"
-void printk_address(unsigned long address, int reliable)
+#define N_EXCEPTION_STACKS_END \
+ (N_EXCEPTION_STACKS + DEBUG_STKSZ/EXCEPTION_STKSZ - 2)
+
+static char x86_stack_ids[][8] = {
+ [ DEBUG_STACK-1 ] = "#DB",
+ [ NMI_STACK-1 ] = "NMI",
+ [ DOUBLEFAULT_STACK-1 ] = "#DF",
+ [ STACKFAULT_STACK-1 ] = "#SS",
+ [ MCE_STACK-1 ] = "#MC",
+#if DEBUG_STKSZ > EXCEPTION_STKSZ
+ [ N_EXCEPTION_STACKS ...
+ N_EXCEPTION_STACKS_END ] = "#DB[?]"
+#endif
+};
+
+int x86_is_stack_id(int id, char *name)
{
- printk(" [<%p>] %s%pS\n", (void *) address,
- reliable ? "" : "? ", (void *) address);
+ return x86_stack_ids[id - 1] == name;
}
static unsigned long *in_exception_stack(unsigned cpu, unsigned long stack,
- unsigned *usedp, char **idp)
+ unsigned *usedp, char **idp)
{
- static char ids[][8] = {
- [DEBUG_STACK - 1] = "#DB",
- [NMI_STACK - 1] = "NMI",
- [DOUBLEFAULT_STACK - 1] = "#DF",
- [STACKFAULT_STACK - 1] = "#SS",
- [MCE_STACK - 1] = "#MC",
-#if DEBUG_STKSZ > EXCEPTION_STKSZ
- [N_EXCEPTION_STACKS ...
- N_EXCEPTION_STACKS + DEBUG_STKSZ / EXCEPTION_STKSZ - 2] = "#DB[?]"
-#endif
- };
unsigned k;
/*
if (*usedp & (1U << k))
break;
*usedp |= 1U << k;
- *idp = ids[k];
+ *idp = x86_stack_ids[k];
return (unsigned long *)end;
}
/*
do {
++j;
end -= EXCEPTION_STKSZ;
- ids[j][4] = '1' + (j - N_EXCEPTION_STACKS);
+ x86_stack_ids[j][4] = '1' +
+ (j - N_EXCEPTION_STACKS);
} while (stack < end - EXCEPTION_STKSZ);
if (*usedp & (1U << j))
break;
*usedp |= 1U << j;
- *idp = ids[j];
+ *idp = x86_stack_ids[j];
return (unsigned long *)end;
}
#endif
return NULL;
}
-/*
- * x86-64 can have up to three kernel stacks:
- * process stack
- * interrupt stack
- * severe exception (double fault, nmi, stack fault, debug, mce) hardware stack
- */
-
-static inline int valid_stack_ptr(struct thread_info *tinfo,
- void *p, unsigned int size, void *end)
+static inline int
+in_irq_stack(unsigned long *stack, unsigned long *irq_stack,
+ unsigned long *irq_stack_end)
{
- void *t = tinfo;
- if (end) {
- if (p < end && p >= (end-THREAD_SIZE))
- return 1;
- else
- return 0;
- }
- return p > t && p < t + THREAD_SIZE - size;
+ return (stack >= irq_stack && stack < irq_stack_end);
}
-/* The form of the top of the frame on the stack */
-struct stack_frame {
- struct stack_frame *next_frame;
- unsigned long return_address;
-};
-
+/*
+ * We are returning from the irq stack and go to the previous one.
+ * If the previous stack is also in the irq stack, then bp in the first
+ * frame of the irq stack points to the previous, interrupted one.
+ * Otherwise we have another level of indirection: We first save
+ * the bp of the previous stack, then we switch the stack to the irq one
+ * and save a new bp that links to the previous one.
+ * (See save_args())
+ */
static inline unsigned long
-print_context_stack(struct thread_info *tinfo,
- unsigned long *stack, unsigned long bp,
- const struct stacktrace_ops *ops, void *data,
- unsigned long *end)
+fixup_bp_irq_link(unsigned long bp, unsigned long *stack,
+ unsigned long *irq_stack, unsigned long *irq_stack_end)
{
+#ifdef CONFIG_FRAME_POINTER
struct stack_frame *frame = (struct stack_frame *)bp;
- while (valid_stack_ptr(tinfo, stack, sizeof(*stack), end)) {
- unsigned long addr;
-
- addr = *stack;
- if (__kernel_text_address(addr)) {
- if ((unsigned long) stack == bp + 8) {
- ops->address(data, addr, 1);
- frame = frame->next_frame;
- bp = (unsigned long) frame;
- } else {
- ops->address(data, addr, bp == 0);
- }
- }
- stack++;
- }
+ if (!in_irq_stack(stack, irq_stack, irq_stack_end))
+ return (unsigned long)frame->next_frame;
+#endif
return bp;
}
+/*
+ * x86-64 can have up to three kernel stacks:
+ * process stack
+ * interrupt stack
+ * severe exception (double fault, nmi, stack fault, debug, mce) hardware stack
+ */
+
void dump_trace(struct task_struct *task, struct pt_regs *regs,
unsigned long *stack, unsigned long bp,
const struct stacktrace_ops *ops, void *data)
{
const unsigned cpu = get_cpu();
- unsigned long *irqstack_end = (unsigned long *)cpu_pda(cpu)->irqstackptr;
+ unsigned long *irq_stack_end =
+ (unsigned long *)per_cpu(irq_stack_ptr, cpu);
unsigned used = 0;
struct thread_info *tinfo;
+ int graph = 0;
if (!task)
task = current;
if (!bp) {
if (task == current) {
/* Grab bp right from our regs */
- asm("movq %%rbp, %0" : "=r" (bp) : );
+ get_bp(bp);
} else {
/* bp is the last reg pushed by switch_to */
bp = *(unsigned long *) task->thread.sp;
if (ops->stack(data, id) < 0)
break;
- bp = print_context_stack(tinfo, stack, bp, ops,
- data, estack_end);
+ bp = ops->walk_stack(tinfo, stack, bp, ops,
+ data, estack_end, &graph);
ops->stack(data, "<EOE>");
/*
* We link to the next stack via the
stack = (unsigned long *) estack_end[-2];
continue;
}
- if (irqstack_end) {
- unsigned long *irqstack;
- irqstack = irqstack_end -
- (IRQSTACKSIZE - 64) / sizeof(*irqstack);
+ if (irq_stack_end) {
+ unsigned long *irq_stack;
+ irq_stack = irq_stack_end -
+ (IRQ_STACK_SIZE - 64) / sizeof(*irq_stack);
- if (stack >= irqstack && stack < irqstack_end) {
+ if (in_irq_stack(stack, irq_stack, irq_stack_end)) {
if (ops->stack(data, "IRQ") < 0)
break;
bp = print_context_stack(tinfo, stack, bp,
- ops, data, irqstack_end);
+ ops, data, irq_stack_end, &graph);
/*
* We link to the next stack (which would be
* the process stack normally) the last
* pointer (index -1 to end) in the IRQ stack:
*/
- stack = (unsigned long *) (irqstack_end[-1]);
- irqstack_end = NULL;
+ stack = (unsigned long *) (irq_stack_end[-1]);
+ bp = fixup_bp_irq_link(bp, stack, irq_stack,
+ irq_stack_end);
+ irq_stack_end = NULL;
ops->stack(data, "EOI");
continue;
}
/*
* This handles the process stack:
*/
- bp = print_context_stack(tinfo, stack, bp, ops, data, NULL);
+ bp = print_context_stack(tinfo, stack, bp, ops, data, NULL, &graph);
put_cpu();
}
EXPORT_SYMBOL(dump_trace);
-static void
-print_trace_warning_symbol(void *data, char *msg, unsigned long symbol)
-{
- print_symbol(msg, symbol);
- printk("\n");
-}
-
-static void print_trace_warning(void *data, char *msg)
-{
- printk("%s\n", msg);
-}
-
-static int print_trace_stack(void *data, char *name)
-{
- printk(" <%s> ", name);
- return 0;
-}
-
-static void print_trace_address(void *data, unsigned long addr, int reliable)
-{
- touch_nmi_watchdog();
- printk_address(addr, reliable);
-}
-
-static const struct stacktrace_ops print_trace_ops = {
- .warning = print_trace_warning,
- .warning_symbol = print_trace_warning_symbol,
- .stack = print_trace_stack,
- .address = print_trace_address,
-};
-
-static void
-show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
- unsigned long *stack, unsigned long bp, char *log_lvl)
-{
- printk("Call Trace:\n");
- dump_trace(task, regs, stack, bp, &print_trace_ops, log_lvl);
-}
-
-void show_trace(struct task_struct *task, struct pt_regs *regs,
- unsigned long *stack, unsigned long bp)
-{
- show_trace_log_lvl(task, regs, stack, bp, "");
-}
-
-static void
+void
show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs,
- unsigned long *sp, unsigned long bp, char *log_lvl)
+ unsigned long *sp, unsigned long bp, char *log_lvl)
{
+ unsigned long *irq_stack_end;
+ unsigned long *irq_stack;
unsigned long *stack;
+ int cpu;
int i;
- const int cpu = smp_processor_id();
- unsigned long *irqstack_end =
- (unsigned long *) (cpu_pda(cpu)->irqstackptr);
- unsigned long *irqstack =
- (unsigned long *) (cpu_pda(cpu)->irqstackptr - IRQSTACKSIZE);
+
+ preempt_disable();
+ cpu = smp_processor_id();
+
+ irq_stack_end = (unsigned long *)(per_cpu(irq_stack_ptr, cpu));
+ irq_stack = (unsigned long *)(per_cpu(irq_stack_ptr, cpu) - IRQ_STACK_SIZE);
/*
- * debugging aid: "show_stack(NULL, NULL);" prints the
- * back trace for this cpu.
+ * Debugging aid: "show_stack(NULL, NULL);" prints the
+ * back trace for this cpu:
*/
-
if (sp == NULL) {
if (task)
sp = (unsigned long *)task->thread.sp;
stack = sp;
for (i = 0; i < kstack_depth_to_print; i++) {
- if (stack >= irqstack && stack <= irqstack_end) {
- if (stack == irqstack_end) {
- stack = (unsigned long *) (irqstack_end[-1]);
+ if (stack >= irq_stack && stack <= irq_stack_end) {
+ if (stack == irq_stack_end) {
+ stack = (unsigned long *) (irq_stack_end[-1]);
printk(" <EOI> ");
}
} else {
if (((long) stack & (THREAD_SIZE-1)) == 0)
break;
}
- if (i && ((i % 4) == 0))
- printk("\n");
+ if (i && ((i % STACKSLOTS_PER_LINE) == 0))
+ printk("\n%s", log_lvl);
printk(" %016lx", *stack++);
touch_nmi_watchdog();
}
+ preempt_enable();
+
printk("\n");
show_trace_log_lvl(task, regs, sp, bp, log_lvl);
}
-void show_stack(struct task_struct *task, unsigned long *sp)
-{
- show_stack_log_lvl(task, NULL, sp, 0, "");
-}
-
-/*
- * The architecture-independent dump_stack generator
- */
-void dump_stack(void)
-{
- unsigned long bp = 0;
- unsigned long stack;
-
-#ifdef CONFIG_FRAME_POINTER
- if (!bp)
- asm("movq %%rbp, %0" : "=r" (bp) : );
-#endif
-
- printk("Pid: %d, comm: %.20s %s %s %.*s\n",
- current->pid, current->comm, print_tainted(),
- init_utsname()->release,
- (int)strcspn(init_utsname()->version, " "),
- init_utsname()->version);
- show_trace(NULL, NULL, &stack, bp);
-}
-EXPORT_SYMBOL(dump_stack);
-
void show_registers(struct pt_regs *regs)
{
int i;
unsigned long sp;
const int cpu = smp_processor_id();
- struct task_struct *cur = cpu_pda(cpu)->pcurrent;
+ struct task_struct *cur = current;
sp = regs->sp;
printk("CPU %d ", cpu);
unsigned char c;
u8 *ip;
- printk("Stack: ");
+ printk(KERN_EMERG "Stack:\n");
show_stack_log_lvl(NULL, regs, (unsigned long *)sp,
- regs->bp, "");
+ regs->bp, KERN_EMERG);
printk(KERN_EMERG "Code: ");
ip = (u8 *)regs->ip - code_prologue;
if (ip < (u8 *)PAGE_OFFSET || probe_kernel_address(ip, c)) {
- /* try starting at RIP */
+ /* try starting at IP */
ip = (u8 *)regs->ip;
code_len = code_len - code_prologue + 1;
}
return ud2 == 0x0b0f;
}
-
-static raw_spinlock_t die_lock = __RAW_SPIN_LOCK_UNLOCKED;
-static int die_owner = -1;
-static unsigned int die_nest_count;
-
-unsigned __kprobes long oops_begin(void)
-{
- int cpu;
- unsigned long flags;
-
- oops_enter();
-
- /* racy, but better than risking deadlock. */
- raw_local_irq_save(flags);
- cpu = smp_processor_id();
- if (!__raw_spin_trylock(&die_lock)) {
- if (cpu == die_owner)
- /* nested oops. should stop eventually */;
- else
- __raw_spin_lock(&die_lock);
- }
- die_nest_count++;
- die_owner = cpu;
- console_verbose();
- bust_spinlocks(1);
- return flags;
-}
-
-void __kprobes oops_end(unsigned long flags, struct pt_regs *regs, int signr)
-{
- die_owner = -1;
- bust_spinlocks(0);
- die_nest_count--;
- if (!die_nest_count)
- /* Nest count reaches zero, release the lock. */
- __raw_spin_unlock(&die_lock);
- raw_local_irq_restore(flags);
- if (!regs) {
- oops_exit();
- return;
- }
- if (in_interrupt())
- panic("Fatal exception in interrupt");
- if (panic_on_oops)
- panic("Fatal exception");
- oops_exit();
- do_exit(signr);
-}
-
-int __kprobes __die(const char *str, struct pt_regs *regs, long err)
-{
- printk(KERN_EMERG "%s: %04lx [%u] ", str, err & 0xffff, ++die_counter);
-#ifdef CONFIG_PREEMPT
- printk("PREEMPT ");
-#endif
-#ifdef CONFIG_SMP
- printk("SMP ");
-#endif
-#ifdef CONFIG_DEBUG_PAGEALLOC
- printk("DEBUG_PAGEALLOC");
-#endif
- printk("\n");
- if (notify_die(DIE_OOPS, str, regs, err,
- current->thread.trap_no, SIGSEGV) == NOTIFY_STOP)
- return 1;
-
- show_registers(regs);
- add_taint(TAINT_DIE);
- /* Executive summary in case the oops scrolled away */
- printk(KERN_ALERT "RIP ");
- printk_address(regs->ip, 1);
- printk(" RSP <%016lx>\n", regs->sp);
- if (kexec_should_crash(current))
- crash_kexec(regs);
- return 0;
-}
-
-void die(const char *str, struct pt_regs *regs, long err)
-{
- unsigned long flags = oops_begin();
-
- if (!user_mode(regs))
- report_bug(regs->ip, regs);
-
- if (__die(str, regs, err))
- regs = NULL;
- oops_end(flags, regs, SIGSEGV);
-}
-
-notrace __kprobes void
-die_nmi(char *str, struct pt_regs *regs, int do_panic)
-{
- unsigned long flags;
-
- if (notify_die(DIE_NMIWATCHDOG, str, regs, 0, 2, SIGINT) == NOTIFY_STOP)
- return;
-
- flags = oops_begin();
- /*
- * We are in trouble anyway, lets at least try
- * to get a message out.
- */
- printk(KERN_EMERG "%s", str);
- printk(" on CPU%d, ip %08lx, registers:\n",
- smp_processor_id(), regs->ip);
- show_registers(regs);
- if (kexec_should_crash(current))
- crash_kexec(regs);
- if (do_panic || panic_on_oops)
- panic("Non maskable interrupt");
- oops_end(flags, NULL, SIGBUS);
- nmi_exit();
- local_irq_enable();
- do_exit(SIGBUS);
-}
-
-static int __init oops_setup(char *s)
-{
- if (!s)
- return -EINVAL;
- if (!strcmp(s, "panic"))
- panic_on_oops = 1;
- return 0;
-}
-early_param("oops", oops_setup);
-
-static int __init kstack_setup(char *s)
-{
- if (!s)
- return -EINVAL;
- kstack_depth_to_print = simple_strtoul(s, NULL, 0);
- return 0;
-}
-early_param("kstack", kstack_setup);
-
-static int __init code_bytes_setup(char *s)
-{
- code_bytes = simple_strtoul(s, NULL, 0);
- if (code_bytes > 8192)
- code_bytes = 8192;
-
- return 1;
-}
-__setup("code_bytes=", code_bytes_setup);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff