576 lines
13 KiB
C
576 lines
13 KiB
C
/*
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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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#include <linux/sysfs.h>
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#include <asm/stacktrace.h>
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#define STACKSLOTS_PER_LINE 4
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#define get_bp(bp) asm("movq %%rbp, %0" : "=r" (bp) :)
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int panic_on_unrecovered_nmi;
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int kstack_depth_to_print = 3 * STACKSLOTS_PER_LINE;
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static unsigned int code_bytes = 64;
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static int die_counter;
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void printk_address(unsigned long address, int reliable)
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{
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printk(" [<%p>] %s%pS\n", (void *) address,
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reliable ? "" : "? ", (void *) address);
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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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* 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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* 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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* 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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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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/* 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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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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while (valid_stack_ptr(tinfo, stack, sizeof(*stack), end)) {
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unsigned long addr;
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addr = *stack;
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if (__kernel_text_address(addr)) {
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if ((unsigned long) stack == bp + sizeof(long)) {
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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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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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if (!task)
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task = current;
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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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#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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get_bp(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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* 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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if (estack_end) {
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if (ops->stack(data, id) < 0)
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break;
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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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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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* 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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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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printk(data);
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print_symbol(msg, symbol);
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printk("\n");
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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%s\n", (char *)data, msg);
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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 <%s> ", (char *)data, name);
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return 0;
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}
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/*
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* Print one address/symbol entries per line.
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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(data);
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printk_address(addr, reliable);
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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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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("%sCall Trace:\n", log_lvl);
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dump_trace(task, regs, stack, bp, &print_trace_ops, log_lvl);
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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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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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* 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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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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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 % STACKSLOTS_PER_LINE) == 0))
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printk("\n%s", log_lvl);
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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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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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* 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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#ifdef CONFIG_FRAME_POINTER
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if (!bp)
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get_bp(bp);
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#endif
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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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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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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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* 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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printk(KERN_EMERG "Stack:\n");
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show_stack_log_lvl(NULL, regs, (unsigned long *)sp,
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regs->bp, KERN_EMERG);
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printk(KERN_EMERG "Code: ");
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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 IP */
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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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int is_valid_bugaddr(unsigned long ip)
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{
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unsigned short ud2;
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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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return ud2 == 0x0b0f;
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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;
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unsigned __kprobes long oops_begin(void)
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{
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int cpu;
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unsigned long flags;
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oops_enter();
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/* racy, but better than risking deadlock. */
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raw_local_irq_save(flags);
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cpu = smp_processor_id();
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if (!__raw_spin_trylock(&die_lock)) {
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if (cpu == die_owner)
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/* nested oops. should stop eventually */;
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else
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__raw_spin_lock(&die_lock);
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}
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die_nest_count++;
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die_owner = cpu;
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console_verbose();
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bust_spinlocks(1);
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return flags;
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}
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void __kprobes oops_end(unsigned long flags, struct pt_regs *regs, int signr)
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{
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die_owner = -1;
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bust_spinlocks(0);
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die_nest_count--;
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if (!die_nest_count)
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/* Nest count reaches zero, release the lock. */
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__raw_spin_unlock(&die_lock);
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raw_local_irq_restore(flags);
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if (!regs) {
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oops_exit();
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return;
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}
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if (in_interrupt())
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panic("Fatal exception in interrupt");
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if (panic_on_oops)
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panic("Fatal exception");
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oops_exit();
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do_exit(signr);
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}
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int __kprobes __die(const char *str, struct pt_regs *regs, long err)
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{
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printk(KERN_EMERG "%s: %04lx [#%d] ", str, err & 0xffff, ++die_counter);
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#ifdef CONFIG_PREEMPT
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printk("PREEMPT ");
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#endif
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#ifdef CONFIG_SMP
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printk("SMP ");
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#endif
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#ifdef CONFIG_DEBUG_PAGEALLOC
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printk("DEBUG_PAGEALLOC");
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#endif
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printk("\n");
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sysfs_printk_last_file();
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if (notify_die(DIE_OOPS, str, regs, err,
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current->thread.trap_no, SIGSEGV) == NOTIFY_STOP)
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return 1;
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show_registers(regs);
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add_taint(TAINT_DIE);
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/* Executive summary in case the oops scrolled away */
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printk(KERN_ALERT "RIP ");
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printk_address(regs->ip, 1);
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printk(" RSP <%016lx>\n", regs->sp);
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if (kexec_should_crash(current))
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crash_kexec(regs);
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return 0;
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}
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void die(const char *str, struct pt_regs *regs, long err)
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{
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unsigned long flags = oops_begin();
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if (!user_mode(regs))
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report_bug(regs->ip, regs);
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if (__die(str, regs, err))
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regs = NULL;
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oops_end(flags, regs, SIGSEGV);
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}
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notrace __kprobes void
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die_nmi(char *str, struct pt_regs *regs, int do_panic)
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{
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unsigned long flags;
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if (notify_die(DIE_NMIWATCHDOG, str, regs, 0, 2, SIGINT) == NOTIFY_STOP)
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return;
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flags = oops_begin();
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/*
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* We are in trouble anyway, lets at least try
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* to get a message out.
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*/
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printk(KERN_EMERG "%s", str);
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printk(" on CPU%d, ip %08lx, registers:\n",
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smp_processor_id(), regs->ip);
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show_registers(regs);
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if (kexec_should_crash(current))
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crash_kexec(regs);
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if (do_panic || panic_on_oops)
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panic("Non maskable interrupt");
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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);
|