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/sched/debug.h> 16 #include <linux/debug_locks.h> 17 18 #include <asm/exceptions.h> 19 #include <asm/unwind.h> 20 21 void trap_init(void) 22 { 23 __enable_hw_exceptions(); 24 } 25 26 static unsigned long kstack_depth_to_print; /* 0 == entire stack */ 27 28 static int __init kstack_setup(char *s) 29 { 30 return !kstrtoul(s, 0, &kstack_depth_to_print); 31 } 32 __setup("kstack=", kstack_setup); 33 34 void show_stack(struct task_struct *task, unsigned long *sp) 35 { 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 } 48 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 } 67 } 68 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 32, 4, (void *)fp, 69 words_to_show << 2, 0); 70 pr_info("\n\nCall Trace:\n"); 71 microblaze_unwind(task, NULL); 72 pr_info("\n"); 73 74 if (!task) 75 task = current; 76 77 debug_show_held_locks(task); 78 } 79