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, base: 0, res: &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, prefix_str: "" , prefix_type: DUMP_PREFIX_ADDRESS, rowsize: 32, |
64 | groupsize: 4, buf: (void *)fp, len: line1_words << 2, ascii: 0); |
65 | fp += line1_words << 2; |
66 | words_to_show -= line1_words; |
67 | } |
68 | } |
69 | print_hex_dump(level: loglvl, prefix_str: "" , prefix_type: DUMP_PREFIX_ADDRESS, rowsize: 32, groupsize: 4, buf: (void *)fp, |
70 | len: words_to_show << 2, ascii: 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 | |