arch/um/kernel/sysrq.c

   1 /*
   2  * Copyright (C) 2001 Jeff Dike (jdike@karaya.com)
   3  * Licensed under the GPL
   4  */
   5
   6 #include "linux/sched.h"
   7 #include "linux/kernel.h"
   8 #include "linux/module.h"
   9 #include "linux/kallsyms.h"
  10 #include "asm/page.h"
  11 #include "asm/processor.h"
  12 #include "sysrq.h"
  13 #include "user_util.h"
  14
  15 void show_trace(unsigned long * stack)
  16 {
  17         /* XXX: Copy the CONFIG_FRAME_POINTER stack-walking backtrace from
  18          * arch/i386/kernel/traps.c, and then move this to sys-i386/sysrq.c.*/
  19         unsigned long addr;
  20
  21         if (!stack) {
  22                 stack = (unsigned long*) &stack;
  23                 WARN_ON(1);
  24         }
  25
  26         printk("Call Trace: \n");
  27         while (((long) stack & (THREAD_SIZE-1)) != 0) {
  28                 addr = *stack;
  29                 if (__kernel_text_address(addr)) {
  30                         printk("%08lx:  [<%08lx>]", (unsigned long) stack, addr);
  31                         print_symbol(" %s", addr);
  32                         printk("\n");
  33                 }
  34                 stack++;
  35         }
  36         printk("\n");
  37 }
  38
  39 /*
  40  * stack dumps generator - this is used by arch-independent code.
  41  * And this is identical to i386 currently.
  42  */
  43 void dump_stack(void)
  44 {
  45         unsigned long stack;
  46
  47         show_trace(&stack);
  48 }
  49 EXPORT_SYMBOL(dump_stack);
  50
  51 /*Stolen from arch/i386/kernel/traps.c */
  52 static int kstack_depth_to_print = 24;
  53
  54 /* This recently started being used in arch-independent code too, as in
  55  * kernel/sched.c.*/
  56 void show_stack(struct task_struct *task, unsigned long *esp)
  57 {
  58         unsigned long *stack;
  59         int i;
  60
  61         if (esp == NULL) {
  62                 if (task != current) {
  63                         esp = (unsigned long *) KSTK_ESP(task);
  64                         /* Which one? No actual difference - just coding style.*/
  65                         //esp = (unsigned long *) PT_REGS_IP(&task->thread.regs);
  66                 } else {
  67                         esp = (unsigned long *) &esp;
  68                 }
  69         }
  70
  71         stack = esp;
  72         for(i = 0; i < kstack_depth_to_print; i++) {
  73                 if (kstack_end(stack))
  74                         break;
  75                 if (i && ((i % 8) == 0))
  76                         printk("\n       ");
  77                 printk("%08lx ", *stack++);
  78         }
  79
  80         show_trace(esp);
  81 }