1/*
2 * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
3 * Copyright (C) 2007-2009 PetaLogix
4 * Copyright (C) 2006 Atmark Techno, Inc.
5 *
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License. See the file "COPYING" in the main directory of this archive
8 * for more details.
9 */
10
11#include <linux/export.h>
12#include <linux/kernel.h>
13#include <linux/kallsyms.h>
14#include <linux/sched.h>
15#include <linux/debug_locks.h>
16
17#include <asm/exceptions.h>
18#include <asm/unwind.h>
19
20void trap_init(void)
21{
22	__enable_hw_exceptions();
23}
24
25static unsigned long kstack_depth_to_print;	/* 0 == entire stack */
26
27static int __init kstack_setup(char *s)
28{
29	return !kstrtoul(s, 0, &kstack_depth_to_print);
30}
31__setup("kstack=", kstack_setup);
32
33void show_stack(struct task_struct *task, unsigned long *sp)
34{
35	unsigned long words_to_show;
36	u32 fp = (u32) sp;
37
38	if (fp == 0) {
39		if (task) {
40			fp = ((struct thread_info *)
41				(task->stack))->cpu_context.r1;
42		} else {
43			/* Pick up caller of dump_stack() */
44			fp = (u32)&sp - 8;
45		}
46	}
47
48	words_to_show = (THREAD_SIZE - (fp & (THREAD_SIZE - 1))) >> 2;
49	if (kstack_depth_to_print && (words_to_show > kstack_depth_to_print))
50		words_to_show = kstack_depth_to_print;
51
52	pr_info("Kernel Stack:\n");
53
54	/*
55	 * Make the first line an 'odd' size if necessary to get
56	 * remaining lines to start at an address multiple of 0x10
57	 */
58	if (fp & 0xF) {
59		unsigned long line1_words = (0x10 - (fp & 0xF)) >> 2;
60		if (line1_words < words_to_show) {
61			print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 32,
62				       4, (void *)fp, line1_words << 2, 0);
63			fp += line1_words << 2;
64			words_to_show -= line1_words;
65		}
66	}
67	print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 32, 4, (void *)fp,
68		       words_to_show << 2, 0);
69	pr_info("\n\nCall Trace:\n");
70	microblaze_unwind(task, NULL);
71	pr_info("\n");
72
73	if (!task)
74		task = current;
75
76	debug_show_held_locks(task);
77}
78