1/*
 2 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 3 * Licensed under the GPL
 
 
 
 
 4 */
 5
 6#include <linux/kallsyms.h>
 7#include <linux/kernel.h>
 8#include <linux/module.h>
 9#include <linux/sched.h>
10#include "sysrq.h"
 
11
12/* Catch non-i386 SUBARCH's. */
13#if !defined(CONFIG_UML_X86) || defined(CONFIG_64BIT)
14void show_trace(struct task_struct *task, unsigned long * stack)
 
 
 
15{
 
16	unsigned long addr;
 
17
18	if (!stack) {
19		stack = (unsigned long*) &stack;
20		WARN_ON(1);
21	}
22
23	printk(KERN_INFO "Call Trace: \n");
24	while (((long) stack & (THREAD_SIZE-1)) != 0) {
25		addr = *stack;
26		if (__kernel_text_address(addr)) {
27			printk(KERN_INFO "%08lx:  [<%08lx>]",
28			       (unsigned long) stack, addr);
29			print_symbol(KERN_CONT " %s", addr);
 
 
 
 
 
 
 
30			printk(KERN_CONT "\n");
31		}
32		stack++;
33	}
34	printk(KERN_INFO "\n");
35}
36#endif
37
38/*
39 * stack dumps generator - this is used by arch-independent code.
40 * And this is identical to i386 currently.
41 */
42void dump_stack(void)
43{
44	unsigned long stack;
45
46	show_trace(current, &stack);
 
47}
48EXPORT_SYMBOL(dump_stack);
49
50/*Stolen from arch/i386/kernel/traps.c */
51static const int kstack_depth_to_print = 24;
 
 
 
 
 
 
52
53/* This recently started being used in arch-independent code too, as in
54 * kernel/sched.c.*/
55void show_stack(struct task_struct *task, unsigned long *esp)
56{
57	unsigned long *stack;
 
58	int i;
59
60	if (esp == NULL) {
61		if (task != current && task != NULL) {
62			esp = (unsigned long *) KSTK_ESP(task);
63		} else {
64			esp = (unsigned long *) &esp;
65		}
66	}
67
68	stack = esp;
69	for (i = 0; i < kstack_depth_to_print; i++) {
 
 
 
 
 
 
 
 
70		if (kstack_end(stack))
71			break;
72		if (i && ((i % 8) == 0))
73			printk(KERN_INFO "       ");
74		printk(KERN_CONT "%08lx ", *stack++);
75	}
 
76
77	show_trace(task, esp);
78}

 1/*
 2 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 3 * Copyright (C) 2013 Richard Weinberger <richrd@nod.at>
 4 *
 5 * This program is free software; you can redistribute it and/or modify
 6 * it under the terms of the GNU General Public License version 2 as
 7 * published by the Free Software Foundation.
 8 */
 9
10#include <linux/kallsyms.h>
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/sched.h>
14#include <asm/sysrq.h>
15#include <os.h>
16
17struct stack_frame {
18	struct stack_frame *next_frame;
19	unsigned long return_address;
20};
21
22static void do_stack_trace(unsigned long *sp, unsigned long bp)
23{
24	int reliable;
25	unsigned long addr;
26	struct stack_frame *frame = (struct stack_frame *)bp;
27
28	printk(KERN_INFO "Call Trace:\n");
29	while (((long) sp & (THREAD_SIZE-1)) != 0) {
30		addr = *sp;
 
 
 
 
 
31		if (__kernel_text_address(addr)) {
32			reliable = 0;
33			if ((unsigned long) sp == bp + sizeof(long)) {
34				frame = frame ? frame->next_frame : NULL;
35				bp = (unsigned long)frame;
36				reliable = 1;
37			}
38
39			printk(KERN_INFO " [<%08lx>]", addr);
40			printk(KERN_CONT " %s", reliable ? "" : "? ");
41			print_symbol(KERN_CONT "%s", addr);
42			printk(KERN_CONT "\n");
43		}
44		sp++;
45	}
46	printk(KERN_INFO "\n");
47}
 
48
49static unsigned long get_frame_pointer(struct task_struct *task,
50				       struct pt_regs *segv_regs)
 
 
 
51{
52	if (!task || task == current)
53		return segv_regs ? PT_REGS_BP(segv_regs) : current_bp();
54	else
55		return KSTK_EBP(task);
56}
 
57
58static unsigned long *get_stack_pointer(struct task_struct *task,
59					struct pt_regs *segv_regs)
60{
61	if (!task || task == current)
62		return segv_regs ? (unsigned long *)PT_REGS_SP(segv_regs) : current_sp();
63	else
64		return (unsigned long *)KSTK_ESP(task);
65}
66
67void show_stack(struct task_struct *task, unsigned long *stack)
 
 
68{
69	unsigned long *sp = stack, bp = 0;
70	struct pt_regs *segv_regs = current->thread.segv_regs;
71	int i;
72
73	if (!segv_regs && os_is_signal_stack()) {
74		printk(KERN_ERR "Received SIGSEGV in SIGSEGV handler,"
75				" aborting stack trace!\n");
76		return;
 
 
77	}
78
79#ifdef CONFIG_FRAME_POINTER
80	bp = get_frame_pointer(task, segv_regs);
81#endif
82
83	if (!stack)
84		sp = get_stack_pointer(task, segv_regs);
85
86	printk(KERN_INFO "Stack:\n");
87	stack = sp;
88	for (i = 0; i < 3 * STACKSLOTS_PER_LINE; i++) {
89		if (kstack_end(stack))
90			break;
91		if (i && ((i % STACKSLOTS_PER_LINE) == 0))
92			printk(KERN_CONT "\n");
93		printk(KERN_CONT " %08lx", *stack++);
94	}
95	printk(KERN_CONT "\n");
96
97	do_stack_trace(sp, bp);
98}