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