/home/lenb/src/to-akpm branch 'acpi-2.6.12'
[linux-2.6] / 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/config.h"
7 #include "linux/sched.h"
8 #include "linux/kernel.h"
9 #include "linux/module.h"
10 #include "linux/kallsyms.h"
11 #include "asm/page.h"
12 #include "asm/processor.h"
13 #include "sysrq.h"
14 #include "user_util.h"
15
16 /* Catch non-i386 SUBARCH's. */
17 #if !defined(CONFIG_UML_X86) || defined(CONFIG_64BIT)
18 void show_trace(struct task_struct *task, unsigned long * stack)
19 {
20         unsigned long addr;
21
22         if (!stack) {
23                 stack = (unsigned long*) &stack;
24                 WARN_ON(1);
25         }
26
27         printk("Call Trace: \n");
28         while (((long) stack & (THREAD_SIZE-1)) != 0) {
29                 addr = *stack;
30                 if (__kernel_text_address(addr)) {
31                         printk("%08lx:  [<%08lx>]", (unsigned long) stack, addr);
32                         print_symbol(" %s", addr);
33                         printk("\n");
34                 }
35                 stack++;
36         }
37         printk("\n");
38 }
39 #endif
40
41 /*
42  * stack dumps generator - this is used by arch-independent code.
43  * And this is identical to i386 currently.
44  */
45 void dump_stack(void)
46 {
47         unsigned long stack;
48
49         show_trace(current, &stack);
50 }
51 EXPORT_SYMBOL(dump_stack);
52
53 /*Stolen from arch/i386/kernel/traps.c */
54 static int kstack_depth_to_print = 24;
55
56 /* This recently started being used in arch-independent code too, as in
57  * kernel/sched.c.*/
58 void show_stack(struct task_struct *task, unsigned long *esp)
59 {
60         unsigned long *stack;
61         int i;
62
63         if (esp == NULL) {
64                 if (task != current && task != NULL) {
65                         /* XXX: Isn't this bogus? I.e. isn't this the
66                          * *userspace* stack of this task? If not so, use this
67                          * even when task == current (as in i386).
68                          */
69                         esp = (unsigned long *) KSTK_ESP(task);
70                         /* Which one? No actual difference - just coding style.*/
71                         //esp = (unsigned long *) PT_REGS_IP(&task->thread.regs);
72                 } else {
73                         esp = (unsigned long *) &esp;
74                 }
75         }
76
77         stack = esp;
78         for(i = 0; i < kstack_depth_to_print; i++) {
79                 if (kstack_end(stack))
80                         break;
81                 if (i && ((i % 8) == 0))
82                         printk("\n       ");
83                 printk("%08lx ", *stack++);
84         }
85
86         printk("Call Trace: \n");
87         show_trace(current, esp);
88 }