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-rw-r--r--arch/x86/kernel/dumpstack.c353
1 files changed, 353 insertions, 0 deletions
diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c
new file mode 100644
index 000000000..9c30acfad
--- /dev/null
+++ b/arch/x86/kernel/dumpstack.c
@@ -0,0 +1,353 @@
+/*
+ * Copyright (C) 1991, 1992 Linus Torvalds
+ * Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs
+ */
+#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/ftrace.h>
+#include <linux/kexec.h>
+#include <linux/bug.h>
+#include <linux/nmi.h>
+#include <linux/sysfs.h>
+
+#include <asm/stacktrace.h>
+
+
+int panic_on_unrecovered_nmi;
+int panic_on_io_nmi;
+unsigned int code_bytes = 64;
+int kstack_depth_to_print = 3 * STACKSLOTS_PER_LINE;
+static int die_counter;
+
+static void printk_stack_address(unsigned long address, int reliable,
+ void *data)
+{
+ printk("%s [<%p>] %s%pB\n",
+ (char *)data, (void *)address, reliable ? "" : "? ",
+ (void *)address);
+}
+
+void printk_address(unsigned long address)
+{
+ pr_cont(" [<%p>] %pS\n", (void *)address, (void *)address);
+}
+
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+static void
+print_ftrace_graph_addr(unsigned long addr, void *data,
+ const struct stacktrace_ops *ops,
+ struct thread_info *tinfo, int *graph)
+{
+ struct task_struct *task;
+ unsigned long ret_addr;
+ int index;
+
+ if (addr != (unsigned long)return_to_handler)
+ return;
+
+ task = tinfo->task;
+ index = task->curr_ret_stack;
+
+ if (!task->ret_stack || index < *graph)
+ return;
+
+ index -= *graph;
+ ret_addr = task->ret_stack[index].ret;
+
+ ops->address(data, ret_addr, 1);
+
+ (*graph)++;
+}
+#else
+static inline void
+print_ftrace_graph_addr(unsigned long addr, void *data,
+ const struct stacktrace_ops *ops,
+ struct thread_info *tinfo, int *graph)
+{ }
+#endif
+
+/*
+ * 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)
+{
+ 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;
+}
+
+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, int *graph)
+{
+ 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 + sizeof(long)) {
+ ops->address(data, addr, 1);
+ frame = frame->next_frame;
+ bp = (unsigned long) frame;
+ } else {
+ ops->address(data, addr, 0);
+ }
+ print_ftrace_graph_addr(addr, data, ops, tinfo, graph);
+ }
+ stack++;
+ }
+ return bp;
+}
+EXPORT_SYMBOL_GPL(print_context_stack);
+
+unsigned long
+print_context_stack_bp(struct thread_info *tinfo,
+ unsigned long *stack, unsigned long bp,
+ const struct stacktrace_ops *ops, void *data,
+ unsigned long *end, int *graph)
+{
+ struct stack_frame *frame = (struct stack_frame *)bp;
+ unsigned long *ret_addr = &frame->return_address;
+
+ while (valid_stack_ptr(tinfo, ret_addr, sizeof(*ret_addr), end)) {
+ unsigned long addr = *ret_addr;
+
+ if (!__kernel_text_address(addr))
+ break;
+
+ ops->address(data, addr, 1);
+ frame = frame->next_frame;
+ ret_addr = &frame->return_address;
+ print_ftrace_graph_addr(addr, data, ops, tinfo, graph);
+ }
+
+ return (unsigned long)frame;
+}
+EXPORT_SYMBOL_GPL(print_context_stack_bp);
+
+static int print_trace_stack(void *data, char *name)
+{
+ printk("%s <%s> ", (char *)data, name);
+ return 0;
+}
+
+/*
+ * Print one address/symbol entries per line.
+ */
+static void print_trace_address(void *data, unsigned long addr, int reliable)
+{
+ touch_nmi_watchdog();
+ printk_stack_address(addr, reliable, data);
+}
+
+static const struct stacktrace_ops print_trace_ops = {
+ .stack = print_trace_stack,
+ .address = print_trace_address,
+ .walk_stack = print_context_stack,
+};
+
+void
+show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
+ unsigned long *stack, unsigned long bp, char *log_lvl)
+{
+ printk("%sCall Trace:\n", log_lvl);
+ 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, "");
+}
+
+void show_stack(struct task_struct *task, unsigned long *sp)
+{
+ unsigned long bp = 0;
+ unsigned long stack;
+
+ /*
+ * Stack frames below this one aren't interesting. Don't show them
+ * if we're printing for %current.
+ */
+ if (!sp && (!task || task == current)) {
+ sp = &stack;
+ bp = stack_frame(current, NULL);
+ }
+
+ show_stack_log_lvl(task, NULL, sp, bp, "");
+}
+
+static arch_spinlock_t die_lock = __ARCH_SPIN_LOCK_UNLOCKED;
+static int die_owner = -1;
+static unsigned int die_nest_count;
+
+unsigned 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 (!arch_spin_trylock(&die_lock)) {
+ if (cpu == die_owner)
+ /* nested oops. should stop eventually */;
+ else
+ arch_spin_lock(&die_lock);
+ }
+ die_nest_count++;
+ die_owner = cpu;
+ console_verbose();
+ bust_spinlocks(1);
+ return flags;
+}
+EXPORT_SYMBOL_GPL(oops_begin);
+NOKPROBE_SYMBOL(oops_begin);
+
+void oops_end(unsigned long flags, struct pt_regs *regs, int signr)
+{
+ if (regs && kexec_should_crash(current))
+ crash_kexec(regs);
+
+ bust_spinlocks(0);
+ die_owner = -1;
+ add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
+ die_nest_count--;
+ if (!die_nest_count)
+ /* Nest count reaches zero, release the lock. */
+ arch_spin_unlock(&die_lock);
+ raw_local_irq_restore(flags);
+ oops_exit();
+
+ if (!signr)
+ return;
+ if (in_interrupt())
+ panic("Fatal exception in interrupt");
+ if (panic_on_oops)
+ panic("Fatal exception");
+ do_exit(signr);
+}
+NOKPROBE_SYMBOL(oops_end);
+
+int __die(const char *str, struct pt_regs *regs, long err)
+{
+#ifdef CONFIG_X86_32
+ unsigned short ss;
+ unsigned long sp;
+#endif
+ printk(KERN_DEFAULT
+ "%s: %04lx [#%d] ", 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
+#ifdef CONFIG_KASAN
+ printk("KASAN");
+#endif
+ printk("\n");
+ if (notify_die(DIE_OOPS, str, regs, err,
+ current->thread.trap_nr, SIGSEGV) == NOTIFY_STOP)
+ return 1;
+
+ print_modules();
+ show_regs(regs);
+#ifdef CONFIG_X86_32
+ if (user_mode(regs)) {
+ sp = regs->sp;
+ ss = regs->ss & 0xffff;
+ } else {
+ sp = kernel_stack_pointer(regs);
+ savesegment(ss, ss);
+ }
+ printk(KERN_EMERG "EIP: [<%08lx>] ", regs->ip);
+ print_symbol("%s", regs->ip);
+ printk(" SS:ESP %04x:%08lx\n", ss, sp);
+#else
+ /* Executive summary in case the oops scrolled away */
+ printk(KERN_ALERT "RIP ");
+ printk_address(regs->ip);
+ printk(" RSP <%016lx>\n", regs->sp);
+#endif
+ return 0;
+}
+NOKPROBE_SYMBOL(__die);
+
+/*
+ * This is gone through when something in the kernel has done something bad
+ * and is about to be terminated:
+ */
+void die(const char *str, struct pt_regs *regs, long err)
+{
+ unsigned long flags = oops_begin();
+ int sig = SIGSEGV;
+
+ if (!user_mode(regs))
+ report_bug(regs->ip, regs);
+
+ if (__die(str, regs, err))
+ sig = 0;
+ oops_end(flags, regs, sig);
+}
+
+static int __init kstack_setup(char *s)
+{
+ ssize_t ret;
+ unsigned long val;
+
+ if (!s)
+ return -EINVAL;
+
+ ret = kstrtoul(s, 0, &val);
+ if (ret)
+ return ret;
+ kstack_depth_to_print = val;
+ return 0;
+}
+early_param("kstack", kstack_setup);
+
+static int __init code_bytes_setup(char *s)
+{
+ ssize_t ret;
+ unsigned long val;
+
+ if (!s)
+ return -EINVAL;
+
+ ret = kstrtoul(s, 0, &val);
+ if (ret)
+ return ret;
+
+ code_bytes = val;
+ if (code_bytes > 8192)
+ code_bytes = 8192;
+
+ return 1;
+}
+__setup("code_bytes=", code_bytes_setup);