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, 0, &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, "", DUMP_PREFIX_ADDRESS, 32, 64 4, (void *)fp, line1_words << 2, 0); 65 fp += line1_words << 2; 66 words_to_show -= line1_words; 67 } 68 } 69 print_hex_dump(loglvl, "", DUMP_PREFIX_ADDRESS, 32, 4, (void *)fp, 70 words_to_show << 2, 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