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/cpu.h>
12 #include <linux/export.h>
13 #include <linux/kernel.h>
14 #include <linux/kallsyms.h>
15 #include <linux/sched.h>
16 #include <linux/sched/debug.h>
17 #include <linux/debug_locks.h>
18
19 #include <asm/exceptions.h>
20 #include <asm/unwind.h>
21
22 void trap_init(void)
23 {
24 __enable_hw_exceptions();
25 }
26
27 static unsigned long kstack_depth_to_print; /* 0 == entire stack */
28
29 static int __init kstack_setup(char *s)
30 {
31 return !kstrtoul(s, 0, &kstack_depth_to_print);
32 }
33 __setup("kstack=", kstack_setup);
34
35 void show_stack(struct task_struct *task, unsigned long *sp, const char *loglvl)
36 {
37 unsigned long words_to_show;
38 u32 fp = (u32) sp;
39
40 if (fp == 0) {
41 if (task) {
42 fp = ((struct thread_info *)
43 (task->stack))->cpu_context.r1;
44 } else {
45 /* Pick up caller of dump_stack() */
46 fp = (u32)&sp - 8;
47 }
48 }
49
50 words_to_show = (THREAD_SIZE - (fp & (THREAD_SIZE - 1))) >> 2;
51 if (kstack_depth_to_print && (words_to_show > kstack_depth_to_print))
52 words_to_show = kstack_depth_to_print;
53
54 printk("%sKernel Stack:\n", loglvl);
55
56 /*
57 * Make the first line an 'odd' size if necessary to get
58 * remaining lines to start at an address multiple of 0x10
59 */
60 if (fp & 0xF) {
61 unsigned long line1_words = (0x10 - (fp & 0xF)) >> 2;
62 if (line1_words < words_to_show) {
63 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 32,
64 4, (void *)fp, line1_words << 2, 0);
65 fp += line1_words << 2;
66 words_to_show -= line1_words;
67 }
68 }
69 print_hex_dump(loglvl, "", DUMP_PREFIX_ADDRESS, 32, 4, (void *)fp,
70 words_to_show << 2, 0);
71 printk("%s\n\nCall Trace:\n", loglvl);
72 microblaze_unwind(task, NULL, loglvl);
73 printk("%s\n", loglvl);
74
75 if (!task)
76 task = current;
77
78 debug_show_held_locks(task);
79 }
80
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