projects / mirror_ubuntu-artful-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 65bc6093 MS |
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 | ||
| d64af918 | 11 | #include <linux/export.h> |
| 65bc6093 MS |
12 | #include <linux/kernel.h> |
| 13 | #include <linux/kallsyms.h> | |
| 65bc6093 | 14 | #include <linux/sched.h> |
| b17b0153 | 15 | #include <linux/sched/debug.h> |
| 65bc6093 MS |
16 | #include <linux/debug_locks.h> |
| 17 | ||
| 18 | #include <asm/exceptions.h> | |
| ce3266c0 | 19 | #include <asm/unwind.h> |
| 65bc6093 MS |
20 | |
| 21 | void trap_init(void) | |
| 22 | { | |
| 23 | __enable_hw_exceptions(); | |
| 24 | } | |
| 25 | ||
| ce3266c0 | 26 | static unsigned long kstack_depth_to_print; /* 0 == entire stack */ |
| 65bc6093 MS |
27 | |
| 28 | static int __init kstack_setup(char *s) | |
| 29 | { | |
| 6bd55f0b | 30 | return !kstrtoul(s, 0, &kstack_depth_to_print); |
| 65bc6093 MS |
31 | } |
| 32 | __setup("kstack=", kstack_setup); | |
| 33 | ||
| ce3266c0 | 34 | void show_stack(struct task_struct *task, unsigned long *sp) |
| 65bc6093 | 35 | { |
| ce3266c0 SM |
36 | unsigned long words_to_show; |
| 37 | u32 fp = (u32) sp; | |
| 38 | ||
| 39 | 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 | } | |
| 47 | } | |
| 65bc6093 | 48 | |
| ce3266c0 SM |
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 | ||
| 53 | pr_info("Kernel Stack:\n"); | |
| 54 | ||
| 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 | } | |
| 65bc6093 | 67 | } |
| ce3266c0 SM |
68 | print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 32, 4, (void *)fp, |
| 69 | words_to_show << 2, 0); | |
| 6bd55f0b | 70 | pr_info("\n\nCall Trace:\n"); |
| ce3266c0 SM |
71 | microblaze_unwind(task, NULL); |
| 72 | pr_info("\n"); | |
| 65bc6093 MS |
73 | |
| 74 | if (!task) | |
| 75 | task = current; | |
| 76 | ||
| 77 | debug_show_held_locks(task); | |
| 78 | } |