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@@ -0,0 +1,565 @@
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+/*
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+ * Copyright (C) 1991, 1992 Linus Torvalds
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+ * Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs
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+ */
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+#include <linux/kallsyms.h>
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+#include <linux/kprobes.h>
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+#include <linux/uaccess.h>
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+#include <linux/utsname.h>
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+#include <linux/hardirq.h>
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+#include <linux/kdebug.h>
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+#include <linux/module.h>
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+#include <linux/ptrace.h>
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+#include <linux/kexec.h>
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+#include <linux/bug.h>
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+#include <linux/nmi.h>
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+
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+#include <asm/stacktrace.h>
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+
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+int panic_on_unrecovered_nmi;
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+int kstack_depth_to_print = 12;
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+static unsigned int code_bytes = 64;
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+static int die_counter;
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+
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+void printk_address(unsigned long address, int reliable)
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+{
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+ printk(" [<%016lx>] %s%pS\n",
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+ address, reliable ? "" : "? ", (void *) address);
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+}
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+
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+static unsigned long *in_exception_stack(unsigned cpu, unsigned long stack,
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+ unsigned *usedp, char **idp)
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+{
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+ static char ids[][8] = {
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+ [DEBUG_STACK - 1] = "#DB",
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+ [NMI_STACK - 1] = "NMI",
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+ [DOUBLEFAULT_STACK - 1] = "#DF",
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+ [STACKFAULT_STACK - 1] = "#SS",
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+ [MCE_STACK - 1] = "#MC",
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+#if DEBUG_STKSZ > EXCEPTION_STKSZ
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+ [N_EXCEPTION_STACKS ...
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+ N_EXCEPTION_STACKS + DEBUG_STKSZ / EXCEPTION_STKSZ - 2] = "#DB[?]"
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+#endif
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+ };
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+ unsigned k;
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+
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+ /*
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+ * Iterate over all exception stacks, and figure out whether
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+ * 'stack' is in one of them:
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+ */
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+ for (k = 0; k < N_EXCEPTION_STACKS; k++) {
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+ unsigned long end = per_cpu(orig_ist, cpu).ist[k];
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+ /*
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+ * Is 'stack' above this exception frame's end?
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+ * If yes then skip to the next frame.
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+ */
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+ if (stack >= end)
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+ continue;
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+ /*
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+ * Is 'stack' above this exception frame's start address?
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+ * If yes then we found the right frame.
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+ */
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+ if (stack >= end - EXCEPTION_STKSZ) {
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+ /*
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+ * Make sure we only iterate through an exception
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+ * stack once. If it comes up for the second time
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+ * then there's something wrong going on - just
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+ * break out and return NULL:
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+ */
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+ if (*usedp & (1U << k))
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+ break;
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+ *usedp |= 1U << k;
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+ *idp = ids[k];
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+ return (unsigned long *)end;
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+ }
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+ /*
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+ * If this is a debug stack, and if it has a larger size than
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+ * the usual exception stacks, then 'stack' might still
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+ * be within the lower portion of the debug stack:
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+ */
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+#if DEBUG_STKSZ > EXCEPTION_STKSZ
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+ if (k == DEBUG_STACK - 1 && stack >= end - DEBUG_STKSZ) {
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+ unsigned j = N_EXCEPTION_STACKS - 1;
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+
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+ /*
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+ * Black magic. A large debug stack is composed of
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+ * multiple exception stack entries, which we
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+ * iterate through now. Dont look:
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+ */
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+ do {
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+ ++j;
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+ end -= EXCEPTION_STKSZ;
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+ ids[j][4] = '1' + (j - N_EXCEPTION_STACKS);
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+ } while (stack < end - EXCEPTION_STKSZ);
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+ if (*usedp & (1U << j))
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+ break;
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+ *usedp |= 1U << j;
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+ *idp = ids[j];
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+ return (unsigned long *)end;
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+ }
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+#endif
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+ }
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+ return NULL;
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+}
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+
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+/*
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+ * x86-64 can have up to three kernel stacks:
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+ * process stack
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+ * interrupt stack
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+ * severe exception (double fault, nmi, stack fault, debug, mce) hardware stack
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+ */
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+
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+static inline int valid_stack_ptr(struct thread_info *tinfo,
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+ void *p, unsigned int size, void *end)
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+{
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+ void *t = tinfo;
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+ if (end) {
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+ if (p < end && p >= (end-THREAD_SIZE))
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+ return 1;
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+ else
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+ return 0;
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+ }
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+ return p > t && p < t + THREAD_SIZE - size;
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+}
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+
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+/* The form of the top of the frame on the stack */
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+struct stack_frame {
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+ struct stack_frame *next_frame;
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+ unsigned long return_address;
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+};
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+
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+static inline unsigned long
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+print_context_stack(struct thread_info *tinfo,
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+ unsigned long *stack, unsigned long bp,
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+ const struct stacktrace_ops *ops, void *data,
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+ unsigned long *end)
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+{
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+ struct stack_frame *frame = (struct stack_frame *)bp;
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+
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+ while (valid_stack_ptr(tinfo, stack, sizeof(*stack), end)) {
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+ unsigned long addr;
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+
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+ addr = *stack;
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+ if (__kernel_text_address(addr)) {
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+ if ((unsigned long) stack == bp + 8) {
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+ ops->address(data, addr, 1);
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+ frame = frame->next_frame;
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+ bp = (unsigned long) frame;
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+ } else {
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+ ops->address(data, addr, bp == 0);
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+ }
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+ }
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+ stack++;
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+ }
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+ return bp;
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+}
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+
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+void dump_trace(struct task_struct *task, struct pt_regs *regs,
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+ unsigned long *stack, unsigned long bp,
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+ const struct stacktrace_ops *ops, void *data)
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+{
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+ const unsigned cpu = get_cpu();
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+ unsigned long *irqstack_end = (unsigned long *)cpu_pda(cpu)->irqstackptr;
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+ unsigned used = 0;
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+ struct thread_info *tinfo;
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+
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+ if (!task)
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+ task = current;
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+
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+ if (!stack) {
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+ unsigned long dummy;
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+ stack = &dummy;
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+ if (task && task != current)
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+ stack = (unsigned long *)task->thread.sp;
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+ }
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+
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+#ifdef CONFIG_FRAME_POINTER
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+ if (!bp) {
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+ if (task == current) {
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+ /* Grab bp right from our regs */
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+ asm("movq %%rbp, %0" : "=r" (bp) : );
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+ } else {
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+ /* bp is the last reg pushed by switch_to */
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+ bp = *(unsigned long *) task->thread.sp;
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+ }
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+ }
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+#endif
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+
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+ /*
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+ * Print function call entries in all stacks, starting at the
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+ * current stack address. If the stacks consist of nested
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+ * exceptions
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+ */
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+ tinfo = task_thread_info(task);
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+ for (;;) {
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+ char *id;
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+ unsigned long *estack_end;
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+ estack_end = in_exception_stack(cpu, (unsigned long)stack,
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+ &used, &id);
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+
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+ if (estack_end) {
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+ if (ops->stack(data, id) < 0)
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+ break;
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+
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+ bp = print_context_stack(tinfo, stack, bp, ops,
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+ data, estack_end);
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+ ops->stack(data, "<EOE>");
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+ /*
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+ * We link to the next stack via the
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+ * second-to-last pointer (index -2 to end) in the
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+ * exception stack:
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+ */
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+ stack = (unsigned long *) estack_end[-2];
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+ continue;
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+ }
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+ if (irqstack_end) {
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+ unsigned long *irqstack;
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+ irqstack = irqstack_end -
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+ (IRQSTACKSIZE - 64) / sizeof(*irqstack);
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+
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+ if (stack >= irqstack && stack < irqstack_end) {
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+ if (ops->stack(data, "IRQ") < 0)
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+ break;
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+ bp = print_context_stack(tinfo, stack, bp,
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+ ops, data, irqstack_end);
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+ /*
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+ * We link to the next stack (which would be
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+ * the process stack normally) the last
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+ * pointer (index -1 to end) in the IRQ stack:
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+ */
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+ stack = (unsigned long *) (irqstack_end[-1]);
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+ irqstack_end = NULL;
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+ ops->stack(data, "EOI");
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+ continue;
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+ }
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+ }
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+ break;
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+ }
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+
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+ /*
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+ * This handles the process stack:
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+ */
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+ bp = print_context_stack(tinfo, stack, bp, ops, data, NULL);
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+ put_cpu();
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+}
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+EXPORT_SYMBOL(dump_trace);
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+
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+static void
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+print_trace_warning_symbol(void *data, char *msg, unsigned long symbol)
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+{
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+ print_symbol(msg, symbol);
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+ printk("\n");
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+}
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+
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+static void print_trace_warning(void *data, char *msg)
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+{
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+ printk("%s\n", msg);
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+}
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+
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+static int print_trace_stack(void *data, char *name)
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+{
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+ printk(" <%s> ", name);
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+ return 0;
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+}
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+
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+static void print_trace_address(void *data, unsigned long addr, int reliable)
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+{
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+ touch_nmi_watchdog();
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+ printk_address(addr, reliable);
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+}
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+
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+static const struct stacktrace_ops print_trace_ops = {
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+ .warning = print_trace_warning,
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+ .warning_symbol = print_trace_warning_symbol,
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+ .stack = print_trace_stack,
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+ .address = print_trace_address,
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+};
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+
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+static void
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+show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
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+ unsigned long *stack, unsigned long bp, char *log_lvl)
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+{
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+ printk("Call Trace:\n");
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+ dump_trace(task, regs, stack, bp, &print_trace_ops, log_lvl);
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+}
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+
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+void show_trace(struct task_struct *task, struct pt_regs *regs,
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+ unsigned long *stack, unsigned long bp)
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+{
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+ show_trace_log_lvl(task, regs, stack, bp, "");
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+}
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+
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+static void
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+show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs,
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+ unsigned long *sp, unsigned long bp, char *log_lvl)
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+{
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+ unsigned long *stack;
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+ int i;
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+ const int cpu = smp_processor_id();
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+ unsigned long *irqstack_end =
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+ (unsigned long *) (cpu_pda(cpu)->irqstackptr);
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+ unsigned long *irqstack =
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+ (unsigned long *) (cpu_pda(cpu)->irqstackptr - IRQSTACKSIZE);
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+
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+ /*
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+ * debugging aid: "show_stack(NULL, NULL);" prints the
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+ * back trace for this cpu.
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+ */
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+
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+ if (sp == NULL) {
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+ if (task)
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+ sp = (unsigned long *)task->thread.sp;
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+ else
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+ sp = (unsigned long *)&sp;
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+ }
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+
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+ stack = sp;
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+ for (i = 0; i < kstack_depth_to_print; i++) {
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+ if (stack >= irqstack && stack <= irqstack_end) {
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+ if (stack == irqstack_end) {
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+ stack = (unsigned long *) (irqstack_end[-1]);
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+ printk(" <EOI> ");
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+ }
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+ } else {
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+ if (((long) stack & (THREAD_SIZE-1)) == 0)
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+ break;
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+ }
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+ if (i && ((i % 4) == 0))
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+ printk("\n");
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+ printk(" %016lx", *stack++);
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+ touch_nmi_watchdog();
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+ }
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+ printk("\n");
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+ show_trace_log_lvl(task, regs, sp, bp, log_lvl);
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+}
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+
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+void show_stack(struct task_struct *task, unsigned long *sp)
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+{
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+ show_stack_log_lvl(task, NULL, sp, 0, "");
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+}
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+
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+/*
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+ * The architecture-independent dump_stack generator
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+ */
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+void dump_stack(void)
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+{
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+ unsigned long bp = 0;
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+ unsigned long stack;
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+
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+#ifdef CONFIG_FRAME_POINTER
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+ if (!bp)
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+ asm("movq %%rbp, %0" : "=r" (bp) : );
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+#endif
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+
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+ printk("Pid: %d, comm: %.20s %s %s %.*s\n",
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+ current->pid, current->comm, print_tainted(),
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+ init_utsname()->release,
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+ (int)strcspn(init_utsname()->version, " "),
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+ init_utsname()->version);
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+ show_trace(NULL, NULL, &stack, bp);
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+}
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+EXPORT_SYMBOL(dump_stack);
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+
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+void show_registers(struct pt_regs *regs)
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+{
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+ int i;
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+ unsigned long sp;
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+ const int cpu = smp_processor_id();
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+ struct task_struct *cur = cpu_pda(cpu)->pcurrent;
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+
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+ sp = regs->sp;
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+ printk("CPU %d ", cpu);
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+ __show_regs(regs, 1);
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+ printk("Process %s (pid: %d, threadinfo %p, task %p)\n",
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+ cur->comm, cur->pid, task_thread_info(cur), cur);
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+
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+ /*
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+ * When in-kernel, we also print out the stack and code at the
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+ * time of the fault..
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+ */
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+ if (!user_mode(regs)) {
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+ unsigned int code_prologue = code_bytes * 43 / 64;
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+ unsigned int code_len = code_bytes;
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+ unsigned char c;
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+ u8 *ip;
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+
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+ printk("Stack: ");
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+ show_stack_log_lvl(NULL, regs, (unsigned long *)sp,
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+ regs->bp, "");
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+
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+ printk(KERN_EMERG "Code: ");
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+
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+ ip = (u8 *)regs->ip - code_prologue;
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+ if (ip < (u8 *)PAGE_OFFSET || probe_kernel_address(ip, c)) {
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+ /* try starting at RIP */
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+ ip = (u8 *)regs->ip;
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+ code_len = code_len - code_prologue + 1;
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+ }
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+ for (i = 0; i < code_len; i++, ip++) {
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+ if (ip < (u8 *)PAGE_OFFSET ||
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+ probe_kernel_address(ip, c)) {
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+ printk(" Bad RIP value.");
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+ break;
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+ }
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+ if (ip == (u8 *)regs->ip)
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+ printk("<%02x> ", c);
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+ else
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+ printk("%02x ", c);
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+ }
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+ }
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+ printk("\n");
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+}
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+
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+int is_valid_bugaddr(unsigned long ip)
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+{
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+ unsigned short ud2;
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+
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+ if (__copy_from_user(&ud2, (const void __user *) ip, sizeof(ud2)))
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+ return 0;
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+
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+ return ud2 == 0x0b0f;
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+}
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+
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+static raw_spinlock_t die_lock = __RAW_SPIN_LOCK_UNLOCKED;
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+static int die_owner = -1;
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+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)) {
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|
|
+ 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);
|