blob: 94b6fe93147d5a9644c4694ca8127637dbebcf25 [file] [log] [blame]
Michal Simek65bc6092009-03-27 14:25:29 +01001/*
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
Michal Simekd64af912013-02-01 13:10:35 +010011#include <linux/export.h>
Michal Simek65bc6092009-03-27 14:25:29 +010012#include <linux/kernel.h>
13#include <linux/kallsyms.h>
Michal Simek65bc6092009-03-27 14:25:29 +010014#include <linux/sched.h>
Ingo Molnarb17b0152017-02-08 18:51:35 +010015#include <linux/sched/debug.h>
Michal Simek65bc6092009-03-27 14:25:29 +010016#include <linux/debug_locks.h>
17
18#include <asm/exceptions.h>
Steven J. Magnanice3266c2010-04-27 12:37:54 -050019#include <asm/unwind.h>
Michal Simek65bc6092009-03-27 14:25:29 +010020
21void trap_init(void)
22{
23 __enable_hw_exceptions();
24}
25
Steven J. Magnanice3266c2010-04-27 12:37:54 -050026static unsigned long kstack_depth_to_print; /* 0 == entire stack */
Michal Simek65bc6092009-03-27 14:25:29 +010027
28static int __init kstack_setup(char *s)
29{
Michal Simek6bd55f02012-12-27 10:40:38 +010030 return !kstrtoul(s, 0, &kstack_depth_to_print);
Michal Simek65bc6092009-03-27 14:25:29 +010031}
32__setup("kstack=", kstack_setup);
33
Dmitry Safonov9cb8f062020-06-08 21:32:29 -070034void show_stack(struct task_struct *task, unsigned long *sp, const char *loglvl)
Michal Simek65bc6092009-03-27 14:25:29 +010035{
Steven J. Magnanice3266c2010-04-27 12:37:54 -050036 unsigned long words_to_show;
37 u32 fp = (u32) sp;
Michal Simek65bc6092009-03-27 14:25:29 +010038
Steven J. Magnanice3266c2010-04-27 12:37:54 -050039 if (fp == 0) {
40 if (task) {
41 fp = ((struct thread_info *)
42 (task->stack))->cpu_context.r1;
43 } else {
44 /* Pick up caller of dump_stack() */
45 fp = (u32)&sp - 8;
46 }
Michal Simek65bc6092009-03-27 14:25:29 +010047 }
Steven J. Magnanice3266c2010-04-27 12:37:54 -050048
49 words_to_show = (THREAD_SIZE - (fp & (THREAD_SIZE - 1))) >> 2;
50 if (kstack_depth_to_print && (words_to_show > kstack_depth_to_print))
51 words_to_show = kstack_depth_to_print;
52
Dmitry Safonov35f39682020-06-08 21:30:56 -070053 printk("%sKernel Stack:\n", loglvl);
Steven J. Magnanice3266c2010-04-27 12:37:54 -050054
55 /*
56 * Make the first line an 'odd' size if necessary to get
57 * remaining lines to start at an address multiple of 0x10
58 */
59 if (fp & 0xF) {
60 unsigned long line1_words = (0x10 - (fp & 0xF)) >> 2;
61 if (line1_words < words_to_show) {
62 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 32,
63 4, (void *)fp, line1_words << 2, 0);
64 fp += line1_words << 2;
65 words_to_show -= line1_words;
66 }
67 }
Dmitry Safonov35f39682020-06-08 21:30:56 -070068 print_hex_dump(loglvl, "", DUMP_PREFIX_ADDRESS, 32, 4, (void *)fp,
Steven J. Magnanice3266c2010-04-27 12:37:54 -050069 words_to_show << 2, 0);
Dmitry Safonov35f39682020-06-08 21:30:56 -070070 printk("%s\n\nCall Trace:\n", loglvl);
71 microblaze_unwind(task, NULL, loglvl);
72 printk("%s\n", loglvl);
Michal Simek65bc6092009-03-27 14:25:29 +010073
74 if (!task)
75 task = current;
76
77 debug_show_held_locks(task);
78}